CA1176437A - Jet nozzle plate for an ink jet printing head and method of manufacturing such a jet nozzle plate - Google Patents
Jet nozzle plate for an ink jet printing head and method of manufacturing such a jet nozzle plateInfo
- Publication number
- CA1176437A CA1176437A CA000389479A CA389479A CA1176437A CA 1176437 A CA1176437 A CA 1176437A CA 000389479 A CA000389479 A CA 000389479A CA 389479 A CA389479 A CA 389479A CA 1176437 A CA1176437 A CA 1176437A
- Authority
- CA
- Canada
- Prior art keywords
- bore
- base plate
- jet nozzle
- layer
- recess
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 238000007641 inkjet printing Methods 0.000 title claims description 6
- 239000000463 material Substances 0.000 claims abstract description 21
- 238000000227 grinding Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims description 18
- 238000003801 milling Methods 0.000 claims description 15
- 238000005530 etching Methods 0.000 claims description 5
- 208000002352 blister Diseases 0.000 claims 1
- 238000000151 deposition Methods 0.000 claims 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000001427 coherent effect Effects 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 244000228957 Ferula foetida Species 0.000 description 1
- 101100345589 Mus musculus Mical1 gene Proteins 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/16—Production of nozzles
- B41J2/1621—Manufacturing processes
- B41J2/1626—Manufacturing processes etching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/16—Production of nozzles
- B41J2/162—Manufacturing of the nozzle plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/16—Production of nozzles
- B41J2/1621—Manufacturing processes
- B41J2/1632—Manufacturing processes machining
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/02—Local etching
- C23F1/04—Chemical milling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/4998—Combined manufacture including applying or shaping of fluent material
- Y10T29/49982—Coating
- Y10T29/49986—Subsequent to metal working
Abstract
PRO. 80-508 15 ABSTRACT:
A method of manufacturing a jet nozzle plate utilizes a base plate in which a bore having a diameter which is larger than the inner diameter of the ultimate jet nozzle is provided in order to form a jet nozzle, after which on the front thereof a recess is milled which concentrically surrounds the bore at a distance. Subse-quently, the base plate is covered as a unit, as far as into the bore, with a layer of a chemically depositable material, whose thickness defines the inner diameter of the bore to the inner diameter of the ultimate jet nozzle.
Subsequently, the front of the plate is ground down as far as the layer in the recess and is etched, the material of the base plate exposed by grinding then being removed until the layer projecting from the bore forms a freely project-ing cylindrical tube which is surrounded by a trough.
A method of manufacturing a jet nozzle plate utilizes a base plate in which a bore having a diameter which is larger than the inner diameter of the ultimate jet nozzle is provided in order to form a jet nozzle, after which on the front thereof a recess is milled which concentrically surrounds the bore at a distance. Subse-quently, the base plate is covered as a unit, as far as into the bore, with a layer of a chemically depositable material, whose thickness defines the inner diameter of the bore to the inner diameter of the ultimate jet nozzle.
Subsequently, the front of the plate is ground down as far as the layer in the recess and is etched, the material of the base plate exposed by grinding then being removed until the layer projecting from the bore forms a freely project-ing cylindrical tube which is surrounded by a trough.
Description
~7~
P~I0 80-508 1 26.8.19~1 Jet nozzle plate for an ink jet printing head and method of manufacturing such a jet nozzle pla-te.
T.he invention relates to a method of manuf`ac-turing a jet nozzle plate for an ink jet printing head, utilizing a base plate in which there is provided a bore in order to form a jet nozzle, said bo:re having a diame-ter which is larger than the internal diameter of the ulti-mate jet nozzle, the base plate being subsequently covered as a whole unit, as far as into the bore, with a layer of a chemically depositable material.
A method of this kind is described in IBM Tech-10 nical Disclosure Bulletin, Vol. 15, No. 9, pages 2845 and 28Lf6. The base plate thereof is provided with a bore in which a wire is concentrically inser~ted, the diameter of said wire corresponding to the inner diameter of -the ultimate jet nozzle, after which the base plate is covered as a whole uni-t, as far as into the bore, with a layer of a material which is chemically deposited, after which the wire is removed by etching so tha-t the jet nozzle is cleared. A given length of -the wire projects from the bore, so that material is also deposited thereon and a jet nozzle is formed which consists of a tube whose free end projects from the jet nozzle plate. A method of this kind is not easy to perform, particularly in view of the centering of the wire in the bore.
For -the ~`ormation of` a jet nozzle plate where a jet nozzle i.9 :formed by a -tube whose free encl projects from the je-t nozzle plate, it may be statecl that even though :favourable properties are t:hLLs obtaiIIed as regarcls the e;jection o:f drop:Le-ts of ink from st:lch a jet nozzle plate, it is di:f`f`icult to cap the jet nozz:Le exact.1.y witl a capping devlce when the jet nozzle is out o.L` operatio:n, for example, in tl1e rest condi-tion o.t` the :ink jet printing head~ in or~er to prevent drying of the ink in the jet nozzle and hence clogging of the nozz:le so -that it can ~7~7 PEIO. 80-508 2 no longer be used, This difficulty arises inter alia because the capping device, customarily consistin~ of a slightly elastic cushion, is not exactly flatly arranged against the end face of the tube but is curved around this end, so that it does not comple-tely cover the jet nozzle. In this respect German Auslegeschrift 23 62 576 by Olympia Werke AG, wi~h a "Bekanntmachungstag" date of February 27, 1975, already proposes an embodiment of the jet nozzle plate in which an annùlar trough is provided around a jet nozzle, said trough being adjoined by a dam having a plane surface which is situated at the same level as the end face of the jet nozzle which itself is also tubular. However, said German Auslegeschrift 23 62 576 ~oes not describe how such a jet nozzle plate can be efficiently manufactured~ It is the object of the inven-tion to provide a mekhod of manufacturing a jet nozzle p~ate of the kind set forth where a jet nozzle which is formed by a tube is suxrounded by an annular trough which i.s:adjoined by a dam having a plane surface. The e~ecution of such a method should be as.simple as possible, but it should also be ensured that a jet nozzle plate of this kind can,be very accurately manufactured. To this end, the method in accordan.ce.~it.h the invention is characterized in that prior to the covering of the base plate, consisting of a selectively chemical,ly etchable material, notably brass, with the layer which con,sists notably of nickel, on the ~ront thereof th,ere is milled a recess which surrounds the bore mainly concen.trically at a distance after which the layer is depos.ited with a thickness which defines the inner dia,meter of the bore to the inner ~iameter of the ultimate iet n.ozz~e, after ~hich the fxon,t of the base plate is ground down by an: amo~mt which at least equals the thick-n.ess of the layer but which is smaller than the sum of the thickness of the layer an,d the depth of the recess, after which the base plate is etched from the front to remove the material of the base plate exposed by the grinding operation until the layer projecting from the bore forms a freely projecting c~lindrical tube which is surrouncled by an annular trough~ Thus, using ~7~i~37 PH0 80~508 3 26.801981 -technologically suitably controllable me-thods at the same time the jet nozzle consisting of a free end of a tube is formed as well as a dam which extends at a distance from the jet nozzle determined by an annular trough and which serves as a bearing surface for a cap-ping device. The surface of the dam ex-tends e~actly in the same plane as the end face of the free end of the tube so that particularly accurate capping of the jet nozzle by means of a capping device is possible.
It has been found that the recess surrounding a bore is pre~`erably ~ormed as a circular ring by milling.
The recess can thus be simply and accurately formed by means of an end-miLling cutter.
It has also been found tha-t the recess surroun-ding a bore is preferably formed by the milling of straightgrooves which together form a polygon. The recess can thus be simply formed by means of a side-milling cutter.
Using a method as described above for e~ample the recess surrounding a bore can be milled to a depth 20 which is smaller than the thickness oE the layer subse-quently deposited -thereon. Because the amount by which the front of the base plate must be grouncl down must be larger than the thickness of the layer but smaller than the sum of the thickness of the layer and the depth of the 25 recess grinding may be comparatively cri-tical in the above case when the depth of the recess is small. There-fore it has been found that the recess surrounding a bore is preferably milled to a depth which is greater than the thicl~ness of the layer subsequently depositecl tllereon 30 a~ter which the front of the base plate :is gro~mcl down so far that the layer present in the recess is also slight:Ly grouncl. ~le Imollnt of grirlding is -thus larger so that t~le grincling operation can bc better controlled. Becau.se grind:ing is contlnlled untll tl-le Layer presen-t in the re-35 cess is alsc slightly ground it is acllieved tha-t no raised edges which cou:lcl disturb tlle sllitable cnpp~ r ot the jet nozzle rernain a:Long the edges of the layer preseIlt in the recess.
PH0 80-508 4 26.8.1981 It has also been found that a ~ur-ther recess which has the same depth as the recess surrounding a bore is preferably milled along the edge o~ the base plate.
Thus, without the method becoming more comple~, at the area of the edge of the jet nozzle plate an additional dam is formed as a bearing surface for a capping device which also benefits -the capping of a jet nozzle.
For a method of manufacturing a jet nozzle plate comprising at leas-t -two adjacent jet nozzles it has been found -that the recesses surrounding the adjacent ~ores are preferably milled to change over into one another. The dams thus ~orm a coherent bearing surface around the jet nozz~es, which also has a ~avourable effect on the capping of the jet nozzles with a capping device It has also been found that the recess sur-rounding a bore is preferably extended to the edge of the base plate by further milled recesses which have the same depth as the recess surrounding the bore. Thus, a dam having a maximum bearing surface for a capping device is obtained, so that a jet nozzle can be particularl~
acc~rately capped.
The invention will be described in detail here-inaf-ter with reference to the drawings which show some embodiments in accordance with the invention, ho~ever, 25 without the invention being restricted there-to.
Fig. 1 is a sectional view of a part o~ a base plate with bores, Fig. 2 shows the base plate of Fig. 1 with the recesses which surround a bore, each, 'F:Lg. 3 is a plan ~iew of the base plate o~ Fig.
P~I0 80-508 1 26.8.19~1 Jet nozzle plate for an ink jet printing head and method of manufacturing such a jet nozzle pla-te.
T.he invention relates to a method of manuf`ac-turing a jet nozzle plate for an ink jet printing head, utilizing a base plate in which there is provided a bore in order to form a jet nozzle, said bo:re having a diame-ter which is larger than the internal diameter of the ulti-mate jet nozzle, the base plate being subsequently covered as a whole unit, as far as into the bore, with a layer of a chemically depositable material.
A method of this kind is described in IBM Tech-10 nical Disclosure Bulletin, Vol. 15, No. 9, pages 2845 and 28Lf6. The base plate thereof is provided with a bore in which a wire is concentrically inser~ted, the diameter of said wire corresponding to the inner diameter of -the ultimate jet nozzle, after which the base plate is covered as a whole uni-t, as far as into the bore, with a layer of a material which is chemically deposited, after which the wire is removed by etching so tha-t the jet nozzle is cleared. A given length of -the wire projects from the bore, so that material is also deposited thereon and a jet nozzle is formed which consists of a tube whose free end projects from the jet nozzle plate. A method of this kind is not easy to perform, particularly in view of the centering of the wire in the bore.
For -the ~`ormation of` a jet nozzle plate where a jet nozzle i.9 :formed by a -tube whose free encl projects from the je-t nozzle plate, it may be statecl that even though :favourable properties are t:hLLs obtaiIIed as regarcls the e;jection o:f drop:Le-ts of ink from st:lch a jet nozzle plate, it is di:f`f`icult to cap the jet nozz:Le exact.1.y witl a capping devlce when the jet nozzle is out o.L` operatio:n, for example, in tl1e rest condi-tion o.t` the :ink jet printing head~ in or~er to prevent drying of the ink in the jet nozzle and hence clogging of the nozz:le so -that it can ~7~7 PEIO. 80-508 2 no longer be used, This difficulty arises inter alia because the capping device, customarily consistin~ of a slightly elastic cushion, is not exactly flatly arranged against the end face of the tube but is curved around this end, so that it does not comple-tely cover the jet nozzle. In this respect German Auslegeschrift 23 62 576 by Olympia Werke AG, wi~h a "Bekanntmachungstag" date of February 27, 1975, already proposes an embodiment of the jet nozzle plate in which an annùlar trough is provided around a jet nozzle, said trough being adjoined by a dam having a plane surface which is situated at the same level as the end face of the jet nozzle which itself is also tubular. However, said German Auslegeschrift 23 62 576 ~oes not describe how such a jet nozzle plate can be efficiently manufactured~ It is the object of the inven-tion to provide a mekhod of manufacturing a jet nozzle p~ate of the kind set forth where a jet nozzle which is formed by a tube is suxrounded by an annular trough which i.s:adjoined by a dam having a plane surface. The e~ecution of such a method should be as.simple as possible, but it should also be ensured that a jet nozzle plate of this kind can,be very accurately manufactured. To this end, the method in accordan.ce.~it.h the invention is characterized in that prior to the covering of the base plate, consisting of a selectively chemical,ly etchable material, notably brass, with the layer which con,sists notably of nickel, on the ~ront thereof th,ere is milled a recess which surrounds the bore mainly concen.trically at a distance after which the layer is depos.ited with a thickness which defines the inner dia,meter of the bore to the inner ~iameter of the ultimate iet n.ozz~e, after ~hich the fxon,t of the base plate is ground down by an: amo~mt which at least equals the thick-n.ess of the layer but which is smaller than the sum of the thickness of the layer an,d the depth of the recess, after which the base plate is etched from the front to remove the material of the base plate exposed by the grinding operation until the layer projecting from the bore forms a freely projecting c~lindrical tube which is surrouncled by an annular trough~ Thus, using ~7~i~37 PH0 80~508 3 26.801981 -technologically suitably controllable me-thods at the same time the jet nozzle consisting of a free end of a tube is formed as well as a dam which extends at a distance from the jet nozzle determined by an annular trough and which serves as a bearing surface for a cap-ping device. The surface of the dam ex-tends e~actly in the same plane as the end face of the free end of the tube so that particularly accurate capping of the jet nozzle by means of a capping device is possible.
It has been found that the recess surrounding a bore is pre~`erably ~ormed as a circular ring by milling.
The recess can thus be simply and accurately formed by means of an end-miLling cutter.
It has also been found tha-t the recess surroun-ding a bore is preferably formed by the milling of straightgrooves which together form a polygon. The recess can thus be simply formed by means of a side-milling cutter.
Using a method as described above for e~ample the recess surrounding a bore can be milled to a depth 20 which is smaller than the thickness oE the layer subse-quently deposited -thereon. Because the amount by which the front of the base plate must be grouncl down must be larger than the thickness of the layer but smaller than the sum of the thickness of the layer and the depth of the 25 recess grinding may be comparatively cri-tical in the above case when the depth of the recess is small. There-fore it has been found that the recess surrounding a bore is preferably milled to a depth which is greater than the thicl~ness of the layer subsequently depositecl tllereon 30 a~ter which the front of the base plate :is gro~mcl down so far that the layer present in the recess is also slight:Ly grouncl. ~le Imollnt of grirlding is -thus larger so that t~le grincling operation can bc better controlled. Becau.se grind:ing is contlnlled untll tl-le Layer presen-t in the re-35 cess is alsc slightly ground it is acllieved tha-t no raised edges which cou:lcl disturb tlle sllitable cnpp~ r ot the jet nozzle rernain a:Long the edges of the layer preseIlt in the recess.
PH0 80-508 4 26.8.1981 It has also been found that a ~ur-ther recess which has the same depth as the recess surrounding a bore is preferably milled along the edge o~ the base plate.
Thus, without the method becoming more comple~, at the area of the edge of the jet nozzle plate an additional dam is formed as a bearing surface for a capping device which also benefits -the capping of a jet nozzle.
For a method of manufacturing a jet nozzle plate comprising at leas-t -two adjacent jet nozzles it has been found -that the recesses surrounding the adjacent ~ores are preferably milled to change over into one another. The dams thus ~orm a coherent bearing surface around the jet nozz~es, which also has a ~avourable effect on the capping of the jet nozzles with a capping device It has also been found that the recess sur-rounding a bore is preferably extended to the edge of the base plate by further milled recesses which have the same depth as the recess surrounding the bore. Thus, a dam having a maximum bearing surface for a capping device is obtained, so that a jet nozzle can be particularl~
acc~rately capped.
The invention will be described in detail here-inaf-ter with reference to the drawings which show some embodiments in accordance with the invention, ho~ever, 25 without the invention being restricted there-to.
Fig. 1 is a sectional view of a part o~ a base plate with bores, Fig. 2 shows the base plate of Fig. 1 with the recesses which surround a bore, each, 'F:Lg. 3 is a plan ~iew of the base plate o~ Fig.
2, Fig. 4 shows the 'base plate of Fig. 2 after deposition of` a layer, Fig. 5 shows the base plate o~' F:ig. l~ al'-ter the grinding of the front side tl1creof, Fig. 6 shows -the 'basc plate of F:ig. 5 a~`ter the etching of the f`ront -thereof in order to f'inish -the jet nozzle plate, ~7643~
PH0 80-508 5 26.8.1981 ~ ig. 7 is a plan view of the jet nozzle plate shown in Fig. 6, Fig. 8 shows, in the same way as Fig. 4, a base plate where the depth of a recess surrounding a bore is smaller than the thickness of the deposited layer, Fig. 9 shows, in the same way as Fig 8, a jet nozzle plate where all dams surrounding the annular troughs change over into one another, ~ ig. 10 shows, analogously to Fig. 9, a jet nozzle plate where the dams ~hich surround the annular troughs and which change o~er into one another extend as ~ar as the edge o~ the base plate, Fig. 11 shows, in the same way as Fig. 3, a base plate where the recess surrounding a bore is formed by the milling of straight troughs which together form a square, Fig. 12 shows, analogously to Fig. 11, a base plate in which the milled straight troughs together form a hexagon.
The pinciple of the method of manu-fact1lring a jet nozzle pla~e in accordance with the invention will be described in detail hereinafter with réference to the figures 1 to 7. The reference numeral 1 in Fig 1 denotes a part of a base plate for a jet nozzle plate which con-sists of a chemically etchable material~ preferably brass.For this embodiment it is assumed that the jet nozzle plate must comprise two adjacent rows of jet nozzLes, the jet nozzl:es in the one row being staggered with respect to the jet nozzles in the other row and each row com-30 prising, for example, twelve jet nozzles. Obviously~ itis alternatively possible to provide more than t~o rows o~` jet nozzl:`~ or only one row of jet nozzles, and the numbcr o~ jet nozzles may Qlso ~e d:if~erent~ for e~amplc, a si~ le ;jet nozzle; th:Ls :Ls completely depenc1ent on l1ow the charac-ters are ~ormed by means of ttle :ink je-t printing head ~or which such a jet nozz:le plate i9 intended. In order to form th~ ind:Lvl.dual jet no~les, the base p1ate 1 is first providcd with bores 2 which are cylindric~l ~6~137 PH0 80-508 6 26.8.1981 at the :~ront 3 of the base plate~ widen in a conical man-ner and finally become cylindrical again It has been found that such a shape which is knotr.~ se is attractive in view of the ultimate configuration of the ink jet nozzles and the connection of the ink supply ducts to the individual jet nozz~es of the jet nozzle plate (which is irrelevant in -this con-te~t~. However~ it is also possible to impart only a simple cylindrical shape to the bores 2.
The diameter of the bores 2 is chosen to be larger than the inner diameter of the ultimate jet nozzle. This offers the advantage that the formation of the bores 2 is simpler, because the inner diameter of a finished jet nozzle is usually very small~ for example, in -the order o~ magnitude of 0.05 mm.
The following s-tep in the manufacture of the jet nozzle plate is the milling of a recess at a distance 4 around each bore on the ~ront 3 of the base plate 1 so that it is concentric -to each bore 2, as appears from the figures 2 and 3. The recesses 4 in this embodimen-t are shaped as annular rings which can be very accura-tely formed by means of an end-milling cutter. The inner dia-meter and the outer diameter of the circular ring of this embodiment are chosen so that two adjacent circular rings in a row overlap one ano-ther, i.e~ the recesses L~ in a row change over into one another. It would alternatively be possi~le to choose the diameters of the circular rings so that two adjacent recesses do not overlap, each bore 2 then being surrounded by a recess which is formed as a closed circular ring. ~t has been found that the inner 30 diameter of the c:ircular ring prefera'bly amounts to eight t:Lmes the inner diameter of the ultimate jet nozzle, 'be-cause :it is then ensured t'hat the f':inishecl jet no~zles ~ormed 'by the tubes iIl the course oL` the method are l'ree.
The outer diameter of` the circular rings then resu:Lts ~rom the distance 'between two 'bores or t`inisl1ed Je-t nozzles which may be in the order o~ magnitude of, for example, 0.5 mm. The depth t of the recesses 4 may be chose~,for example, in the order of magnitude ol` o.ol~ mm in view :~7~3~
PH0 80-508 7 26.8.1981 of the other dimensions given. I-t has also been ~ound (to be elaborated hereinafter) that in the zone along the edge 5 of the base plate 1 a further recess 6 which also covers the edge is preferably milled to the same depth as the recess 4 surrounding a bore 2 The base plate thus treated is subsequently covered as a unit, as far as into the bores 2, with a layer 7 of a chemically depositablc material7 for example, nickel. The thickness d of this layer is chosen so that the inner diameter of the ultimate je-t nozzle is defined by the deposition o~ -this layer. For example, a value o~
approximately 0.03 mm may be chosen for the thickness of the layer 7~ Thus~ a base plate 1 is obtained as shown in Fig. 4. As can be readil~ seen, the depth t of the recesses 1S 4 in this embodiment is chosen so tha-t it exceeds the thickness d of the layer 7~
During the next step, the front 3 of the base plate 1 is ground down by an amount a which at least equals the thickness of the layer 7 bu-t which is smaller than the sum of the thickness d of the layer 7 and the depth t of -the recesses 4. In this embodiment, this amount a is so chosen within the said limits that during the grinding down of the front of the base pla-te, the layer 7 present in -the recesses 4 is also slightly ground as shown in the Figs. 4 and 5. Thus~ around each bore~ or anywhere where no recesses 4 and 6 are present, material of the base plate 1 is exposed, the originally continuous layer 7 thus being divided into separate layers 7. Because grinding is continued urltil the layers present in the re-cesses are a:lso gro~mcl, it is achieved that no raiseded;ges remain along the edges of these layers, with the result that the front o~ the base p:Late forms a complete:Ly ~lat sur~ace.
FinaLly, the base p:late I ls e-tched f`rom the 3S ~ront 3 down, any exposed material of the base pl.lte belng removed, but not the ma-terial of thc layers 7 still present. This means that the etching operation leaves the material of the layer r7 which is present in the bores 2, ~7~64L3'7 PH0 80-508 8 26.8.1981 so tha-t free cylindrical tubes 8 are formed, each of which forms an ultima-te jet nozzle as appears from the Figs. 6 and 7. Due to the removal of the ma-terial of the base plate 1 around each of the tubes 8, each of these S tubes is surrounded by an annular troulgh 9 which is adjoined by a surrounding'dam having a plane surface which has withstood the etching opera-tion, because it is covered by a layer 7. ~ccordingly, each danl 10 consists of the material of the base pla-te at its 'base and oP the material of the layer 7 at its top. The width of the troughs 9 cor:responds to the inner diameter of the circular rings constituting the recesses 4. As a result of the layer 7 present in the recess 6, a dam 11 is also present along the edge ~ of the base plate, whilst between this dam and t5 the dams 10 which surround the troughs 9 material of the base pla-te has also been removed~ so -that again a trough-like recess l2 exists, as clearly shown in Fig. 7 in which all regions which are situated below the surfaces of the dams 10 and 11 are shaded. Because the surfaces of all dams 10 and 11 and the end faces of the tu'bes 8 forming -the jet nozzles have been formed during the sole grinding operation of the front of the ~ase plate, they are all situated in the same plane.
As can be seen7 a jet nozzle plate -thus manu-factured offers thc known advantages, i.e. on the one hand the individual jet nozzles consist of free cylindrical tubes which are very suitable for the ejection of ink droplets, whilst on the other hand the troughs 9 which lceep the indi'~iduaL Jet nozzles ~ree are surrounded 'by 30 dams 10 having a plane surface which is situated in the same plane as the end sur~aces of the tubes 8 ~orming the jet nozzles, so that these dams lO can be used as bearing surfaces when such a jet nozzle pLate is capped by means of a capping device in order to prevent drying of the ink 35 present in tlle jet nozzles and hence clogging Or the jet nozzles. Moreover, the dams 10 which are situated at a distance from -the tubes 8 also offer protection against damaging of the comparatively -vulnerable tubes forming
PH0 80-508 5 26.8.1981 ~ ig. 7 is a plan view of the jet nozzle plate shown in Fig. 6, Fig. 8 shows, in the same way as Fig. 4, a base plate where the depth of a recess surrounding a bore is smaller than the thickness of the deposited layer, Fig. 9 shows, in the same way as Fig 8, a jet nozzle plate where all dams surrounding the annular troughs change over into one another, ~ ig. 10 shows, analogously to Fig. 9, a jet nozzle plate where the dams ~hich surround the annular troughs and which change o~er into one another extend as ~ar as the edge o~ the base plate, Fig. 11 shows, in the same way as Fig. 3, a base plate where the recess surrounding a bore is formed by the milling of straight troughs which together form a square, Fig. 12 shows, analogously to Fig. 11, a base plate in which the milled straight troughs together form a hexagon.
The pinciple of the method of manu-fact1lring a jet nozzle pla~e in accordance with the invention will be described in detail hereinafter with réference to the figures 1 to 7. The reference numeral 1 in Fig 1 denotes a part of a base plate for a jet nozzle plate which con-sists of a chemically etchable material~ preferably brass.For this embodiment it is assumed that the jet nozzle plate must comprise two adjacent rows of jet nozzLes, the jet nozzl:es in the one row being staggered with respect to the jet nozzles in the other row and each row com-30 prising, for example, twelve jet nozzles. Obviously~ itis alternatively possible to provide more than t~o rows o~` jet nozzl:`~ or only one row of jet nozzles, and the numbcr o~ jet nozzles may Qlso ~e d:if~erent~ for e~amplc, a si~ le ;jet nozzle; th:Ls :Ls completely depenc1ent on l1ow the charac-ters are ~ormed by means of ttle :ink je-t printing head ~or which such a jet nozz:le plate i9 intended. In order to form th~ ind:Lvl.dual jet no~les, the base p1ate 1 is first providcd with bores 2 which are cylindric~l ~6~137 PH0 80-508 6 26.8.1981 at the :~ront 3 of the base plate~ widen in a conical man-ner and finally become cylindrical again It has been found that such a shape which is knotr.~ se is attractive in view of the ultimate configuration of the ink jet nozzles and the connection of the ink supply ducts to the individual jet nozz~es of the jet nozzle plate (which is irrelevant in -this con-te~t~. However~ it is also possible to impart only a simple cylindrical shape to the bores 2.
The diameter of the bores 2 is chosen to be larger than the inner diameter of the ultimate jet nozzle. This offers the advantage that the formation of the bores 2 is simpler, because the inner diameter of a finished jet nozzle is usually very small~ for example, in -the order o~ magnitude of 0.05 mm.
The following s-tep in the manufacture of the jet nozzle plate is the milling of a recess at a distance 4 around each bore on the ~ront 3 of the base plate 1 so that it is concentric -to each bore 2, as appears from the figures 2 and 3. The recesses 4 in this embodimen-t are shaped as annular rings which can be very accura-tely formed by means of an end-milling cutter. The inner dia-meter and the outer diameter of the circular ring of this embodiment are chosen so that two adjacent circular rings in a row overlap one ano-ther, i.e~ the recesses L~ in a row change over into one another. It would alternatively be possi~le to choose the diameters of the circular rings so that two adjacent recesses do not overlap, each bore 2 then being surrounded by a recess which is formed as a closed circular ring. ~t has been found that the inner 30 diameter of the c:ircular ring prefera'bly amounts to eight t:Lmes the inner diameter of the ultimate jet nozzle, 'be-cause :it is then ensured t'hat the f':inishecl jet no~zles ~ormed 'by the tubes iIl the course oL` the method are l'ree.
The outer diameter of` the circular rings then resu:Lts ~rom the distance 'between two 'bores or t`inisl1ed Je-t nozzles which may be in the order o~ magnitude of, for example, 0.5 mm. The depth t of the recesses 4 may be chose~,for example, in the order of magnitude ol` o.ol~ mm in view :~7~3~
PH0 80-508 7 26.8.1981 of the other dimensions given. I-t has also been ~ound (to be elaborated hereinafter) that in the zone along the edge 5 of the base plate 1 a further recess 6 which also covers the edge is preferably milled to the same depth as the recess 4 surrounding a bore 2 The base plate thus treated is subsequently covered as a unit, as far as into the bores 2, with a layer 7 of a chemically depositablc material7 for example, nickel. The thickness d of this layer is chosen so that the inner diameter of the ultimate je-t nozzle is defined by the deposition o~ -this layer. For example, a value o~
approximately 0.03 mm may be chosen for the thickness of the layer 7~ Thus~ a base plate 1 is obtained as shown in Fig. 4. As can be readil~ seen, the depth t of the recesses 1S 4 in this embodiment is chosen so tha-t it exceeds the thickness d of the layer 7~
During the next step, the front 3 of the base plate 1 is ground down by an amount a which at least equals the thickness of the layer 7 bu-t which is smaller than the sum of the thickness d of the layer 7 and the depth t of -the recesses 4. In this embodiment, this amount a is so chosen within the said limits that during the grinding down of the front of the base pla-te, the layer 7 present in -the recesses 4 is also slightly ground as shown in the Figs. 4 and 5. Thus~ around each bore~ or anywhere where no recesses 4 and 6 are present, material of the base plate 1 is exposed, the originally continuous layer 7 thus being divided into separate layers 7. Because grinding is continued urltil the layers present in the re-cesses are a:lso gro~mcl, it is achieved that no raiseded;ges remain along the edges of these layers, with the result that the front o~ the base p:Late forms a complete:Ly ~lat sur~ace.
FinaLly, the base p:late I ls e-tched f`rom the 3S ~ront 3 down, any exposed material of the base pl.lte belng removed, but not the ma-terial of thc layers 7 still present. This means that the etching operation leaves the material of the layer r7 which is present in the bores 2, ~7~64L3'7 PH0 80-508 8 26.8.1981 so tha-t free cylindrical tubes 8 are formed, each of which forms an ultima-te jet nozzle as appears from the Figs. 6 and 7. Due to the removal of the ma-terial of the base plate 1 around each of the tubes 8, each of these S tubes is surrounded by an annular troulgh 9 which is adjoined by a surrounding'dam having a plane surface which has withstood the etching opera-tion, because it is covered by a layer 7. ~ccordingly, each danl 10 consists of the material of the base pla-te at its 'base and oP the material of the layer 7 at its top. The width of the troughs 9 cor:responds to the inner diameter of the circular rings constituting the recesses 4. As a result of the layer 7 present in the recess 6, a dam 11 is also present along the edge ~ of the base plate, whilst between this dam and t5 the dams 10 which surround the troughs 9 material of the base pla-te has also been removed~ so -that again a trough-like recess l2 exists, as clearly shown in Fig. 7 in which all regions which are situated below the surfaces of the dams 10 and 11 are shaded. Because the surfaces of all dams 10 and 11 and the end faces of the tu'bes 8 forming -the jet nozzles have been formed during the sole grinding operation of the front of the ~ase plate, they are all situated in the same plane.
As can be seen7 a jet nozzle plate -thus manu-factured offers thc known advantages, i.e. on the one hand the individual jet nozzles consist of free cylindrical tubes which are very suitable for the ejection of ink droplets, whilst on the other hand the troughs 9 which lceep the indi'~iduaL Jet nozzles ~ree are surrounded 'by 30 dams 10 having a plane surface which is situated in the same plane as the end sur~aces of the tubes 8 ~orming the jet nozzles, so that these dams lO can be used as bearing surfaces when such a jet nozzle pLate is capped by means of a capping device in order to prevent drying of the ink 35 present in tlle jet nozzles and hence clogging Or the jet nozzles. Moreover, the dams 10 which are situated at a distance from -the tubes 8 also offer protection against damaging of the comparatively -vulnerable tubes forming
3~7 P~I0 80-50~ 9 26.8.1981 the Jet nozzles; this may also be considered as an ad-vantage.
In this embodiment, the layers 7 which surround the jet nozzles 8 at a distance and which are arranged in a row have a coherent surface, which may 'be attributed to the fact that the relevant recesses 4 in ~hich these layers are presen-t were formed to change over lnto one another. It has been found that such a formation o e the layers 7 is very attractive, because uniform capping of the jet nozzles is thus additionally stimulated. As have already been described, however, it is alternatively possible for the recesses L~ not to change over into one another. In that case each jet nozzle ~ is surrounded at a distance by a separate la~er 7 at a higher level, which may already be considered to be sufficien-t iLor suitable capping o~ the jet nozzles.
With reference to Fig. 4 it has already been stated that -the dep-th t of the recesses 4 is preferably chosen to be larger than the thickness d of the subse-quently deposited layer 7. ~he same result as regards theultimate shaping of the jet nozzle plate, however, can also be obtained by choosing the depth -t to be smaller than the thickness d; these c~rcumstances are shown in Fig. 8. In that case the front of -the base plate must again be ground down by an amount a which is again larger than the thickness d 'but smaller -than the sum of -the thickness d and the depth t Because the depth t itself is now smaller~ the grinding may be more critical in this case~ but :Less mater:ial has to be removed~ which may also 30 be ad~antageous in given circurnstances. 'Mle etc'hing o~
such a base p:Late after t~e grinding is rea:L:L~cd in e~act-ly the same way as in the descri'bed em'boclimcnt.
Tl-le dams 10 w'hich are s:ituated at a hi'~her levcl and which adjo:in t'he trouglls 9 in the jet nozz:Le p:Late in 35 Fig. 9 ~or both rows O:e jet nozzles t'orm a coherent sur-~ace which of~ers an even better support ~`or a capping device. To thi`s end, duringr the forrnation of` the recesses
In this embodiment, the layers 7 which surround the jet nozzles 8 at a distance and which are arranged in a row have a coherent surface, which may 'be attributed to the fact that the relevant recesses 4 in ~hich these layers are presen-t were formed to change over lnto one another. It has been found that such a formation o e the layers 7 is very attractive, because uniform capping of the jet nozzles is thus additionally stimulated. As have already been described, however, it is alternatively possible for the recesses L~ not to change over into one another. In that case each jet nozzle ~ is surrounded at a distance by a separate la~er 7 at a higher level, which may already be considered to be sufficien-t iLor suitable capping o~ the jet nozzles.
With reference to Fig. 4 it has already been stated that -the dep-th t of the recesses 4 is preferably chosen to be larger than the thickness d of the subse-quently deposited layer 7. ~he same result as regards theultimate shaping of the jet nozzle plate, however, can also be obtained by choosing the depth -t to be smaller than the thickness d; these c~rcumstances are shown in Fig. 8. In that case the front of -the base plate must again be ground down by an amount a which is again larger than the thickness d 'but smaller -than the sum of -the thickness d and the depth t Because the depth t itself is now smaller~ the grinding may be more critical in this case~ but :Less mater:ial has to be removed~ which may also 30 be ad~antageous in given circurnstances. 'Mle etc'hing o~
such a base p:Late after t~e grinding is rea:L:L~cd in e~act-ly the same way as in the descri'bed em'boclimcnt.
Tl-le dams 10 w'hich are s:ituated at a hi'~her levcl and which adjo:in t'he trouglls 9 in the jet nozz:Le p:Late in 35 Fig. 9 ~or both rows O:e jet nozzles t'orm a coherent sur-~ace which of~ers an even better support ~`or a capping device. To thi`s end, duringr the forrnation of` the recesses
4 ~he diam-ters o~ -the circular rings are chosen so that ..
~ ~ ~7 P~lO 80-508 10 26.8.1981 the recesses 4 overlap one another also at the area between the two je-t noz~le rows. A similar result could be obtained, for example, by providing a further trough shaped recess between -the two rows of bores 2 in the em-bodiment described with reference to the Figs. 1 to ~,said further recess interconnecting the already provided recesses 4.
In the embodiment shown in Fig. 10, a maximum bearing surface for a capping device is obtained. The dams 10 which surround the troughs and which are situated at a higher level extend in known manner as far as the edge 5 of the base plate and chan~e over into one another to form a cohersn-t surface. This is realized in that after the formation of the recesses 4 in the form of circular rings, these recesses are made to extend, by further milling to the same depth as that of a recess 4 surrounding a bore~
as far as $he edge 5 of the base plate. In other words, the entire front of the base plate ou-tside -the recesses 4 is milled as far as into these recess~s. It has been found 20 that such a jet nozzle plate offers very good results in practice.
In the embodiment of Fig. 11, showing a base plate provided with recesses in the same way as Fig. 2, the recesses surrounding the bores 2 at a distance are 25 formed by the milling of straight troughs which together form a polygon. These -troughs are denoted by broken lines in ~ig. 11. There are provided three continuous troughs 13, 14 and 15 which ex-tend in the longitudinal direction of and adjacent the two rows of bores 2, ancL fur-ther 3U troughs I G wh-ich oxtend txansversely of -the forrner troughs each time laterally of each bore 2. T11ese -troughs thus each time en~Lose a rectangle wllich surrounds a bore 2 clt a distance. ALong the eclge 5 of -tlhe base plate there is ag,lin provided a recess 6 which also encloses the eclge.
35 ~ll these recesses again h.-ve the sarne depth and CaIl be simpl-~ formed by means of a side-miLling cutter. Outside the two rows of bores 2, separate higl1er fields 17 remain which, however, can also be removed by milling i~ a 6~3'~
PHO 80-508 11 26.8.1981 maximum bearing surf`ace is to be obtained like in -the embodimen-t sho~n in Fig. 10. The further steps of the method of manuf`acturing the j et nozzle plate are comple-te-ly analogous to the already described method. All regions
~ ~ ~7 P~lO 80-508 10 26.8.1981 the recesses 4 overlap one another also at the area between the two je-t noz~le rows. A similar result could be obtained, for example, by providing a further trough shaped recess between -the two rows of bores 2 in the em-bodiment described with reference to the Figs. 1 to ~,said further recess interconnecting the already provided recesses 4.
In the embodiment shown in Fig. 10, a maximum bearing surface for a capping device is obtained. The dams 10 which surround the troughs and which are situated at a higher level extend in known manner as far as the edge 5 of the base plate and chan~e over into one another to form a cohersn-t surface. This is realized in that after the formation of the recesses 4 in the form of circular rings, these recesses are made to extend, by further milling to the same depth as that of a recess 4 surrounding a bore~
as far as $he edge 5 of the base plate. In other words, the entire front of the base plate ou-tside -the recesses 4 is milled as far as into these recess~s. It has been found 20 that such a jet nozzle plate offers very good results in practice.
In the embodiment of Fig. 11, showing a base plate provided with recesses in the same way as Fig. 2, the recesses surrounding the bores 2 at a distance are 25 formed by the milling of straight troughs which together form a polygon. These -troughs are denoted by broken lines in ~ig. 11. There are provided three continuous troughs 13, 14 and 15 which ex-tend in the longitudinal direction of and adjacent the two rows of bores 2, ancL fur-ther 3U troughs I G wh-ich oxtend txansversely of -the forrner troughs each time laterally of each bore 2. T11ese -troughs thus each time en~Lose a rectangle wllich surrounds a bore 2 clt a distance. ALong the eclge 5 of -tlhe base plate there is ag,lin provided a recess 6 which also encloses the eclge.
35 ~ll these recesses again h.-ve the sarne depth and CaIl be simpl-~ formed by means of a side-miLling cutter. Outside the two rows of bores 2, separate higl1er fields 17 remain which, however, can also be removed by milling i~ a 6~3'~
PHO 80-508 11 26.8.1981 maximum bearing surf`ace is to be obtained like in -the embodimen-t sho~n in Fig. 10. The further steps of the method of manuf`acturing the j et nozzle plate are comple-te-ly analogous to the already described method. All regions
5 which are at a higher level on the base plate of Fig. 11 of the finished jet nozzle pla-te then form the troughs situated at a lower level and the regions which are situated at a lower level on the base plate of Fig. 11 form the higher dams.
In this embodiment, the base plate 1 is formed by a higher part of a larger plate 18 in order to facili tate the fixation of the ~ery small j et nozzle plate -to the ink j et printing head. For example, this can be realized by means of screws for which purpose corresponding holes 19 are provided in the plate 18.
Tha embodimen~ of Fig. 12 comprises a base plate similar to that of Fig. 11 in which, however9 the straight troughs together form a hexagon. To this end, again three continous troughs 13, 14 and 1~ are provided which extend adjacent to and in the longitidinal direction of the two rows of bores 2. Also provided are crossing continuous troughs 20 and ~1 which extend at an angle with respect to the former troughs, each time la-terally of a bore 2, so that hexagonal edges are formed as sho~n. The troughs can again be simply formed by means of side-milling cu-tters. After -the formation of such a base ptate in the described manner, a jet nozzle plate is again obtained whose jet nozzles which are formed by the tubes are each surrounded by a trough which has a hexagonal edge and 30 which chan~es over into dams, so that the indiviclua] jet noæzles are again uni~`orm:ly centrica:Lly situated in a ~`ree mc~nner.
Obviously, further mod:i~icatiol-s of the des-cribed enlbodllnents are feas;ble. This is applicable, L`or 35 example, to the choice of the matel-ials used for -the manufacture of the base plate and thc :laycr to be provided thereon. For example, the base plate may also be made of bronze or a chemically etchable syntlletlc matericll or ~a76~3~
2 26 8.l981 P~I0 80-508 the layer to be deposited may be chromium.
In this embodiment, the base plate 1 is formed by a higher part of a larger plate 18 in order to facili tate the fixation of the ~ery small j et nozzle plate -to the ink j et printing head. For example, this can be realized by means of screws for which purpose corresponding holes 19 are provided in the plate 18.
Tha embodimen~ of Fig. 12 comprises a base plate similar to that of Fig. 11 in which, however9 the straight troughs together form a hexagon. To this end, again three continous troughs 13, 14 and 1~ are provided which extend adjacent to and in the longitidinal direction of the two rows of bores 2. Also provided are crossing continuous troughs 20 and ~1 which extend at an angle with respect to the former troughs, each time la-terally of a bore 2, so that hexagonal edges are formed as sho~n. The troughs can again be simply formed by means of side-milling cu-tters. After -the formation of such a base ptate in the described manner, a jet nozzle plate is again obtained whose jet nozzles which are formed by the tubes are each surrounded by a trough which has a hexagonal edge and 30 which chan~es over into dams, so that the indiviclua] jet noæzles are again uni~`orm:ly centrica:Lly situated in a ~`ree mc~nner.
Obviously, further mod:i~icatiol-s of the des-cribed enlbodllnents are feas;ble. This is applicable, L`or 35 example, to the choice of the matel-ials used for -the manufacture of the base plate and thc :laycr to be provided thereon. For example, the base plate may also be made of bronze or a chemically etchable syntlletlc matericll or ~a76~3~
2 26 8.l981 P~I0 80-508 the layer to be deposited may be chromium.
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of manufacturing a jet nozzle plate for an ink jet printing head, utilizing a base plate in which there is provided a bore in order to form a jet nozzle, said bore having a diameter which is larger than the inner diameter of the ultimate jet nozzle, the base plate being subsequently covered as a whole unit, as far as into the bore, with a layer of a chemically depositable material, characterized in that the base plate and the layer consist of different, selectively chemically etch-able materials, the method further comprising the steps of milling on the front of the base plate a recess which surrounds the bore mainly concentrically at a distance;
depositing the layer with a thickness which defines the inner diameter of the bore to the inner diameter of the ultimate jet nozzle, grinding down the front of the base plate by an. amount which at least equals the thickness of the layer but which is smaller than the sum of the thick-ness, of the layer and the depth of the recess; etching the base plate from the front to remove the material of the base plate exposed by the grinding operation until the layer projecting from the bore forms a freely projecting cylindrical tube which is surrounded by a trough.
depositing the layer with a thickness which defines the inner diameter of the bore to the inner diameter of the ultimate jet nozzle, grinding down the front of the base plate by an. amount which at least equals the thickness of the layer but which is smaller than the sum of the thick-ness, of the layer and the depth of the recess; etching the base plate from the front to remove the material of the base plate exposed by the grinding operation until the layer projecting from the bore forms a freely projecting cylindrical tube which is surrounded by a trough.
2. A method as claimed in Claim 1, characterized in. that the recess which surrounds a bore is formed by the milling of a circular ring.
3. A method as claimed in Claim 1, characterized in that the recess which surrounds a bore is formed by the milling of straight troughs Which together form a polygon.
4. A method as claimed in Claim 1, characterized in that the recess which surrounds a bore is milled to a depth which is larger than the thickness of the layer sub-sequently deposited, after which the front of the base plate is ground down until the layer present in the recess is also slightly ground.
5. A method as claimed in Claim 1, characterized PHO. 80-508 14 in that along the edge of the base plate there is milled a further recess which also covers the edge and which has the same depth as a recess surrounding a bore.
6. A method as claimed in Claim 1 for manufactur-ing a jet nozzle plate which comprises at least two adjacent jet nozzles, characterized in that the recesses which surround the adjacent bores are milled to change over into one another.
7. A method as claimed in Claim 1, characterized in that the recess which surrounds a bore is milled further to the same depth as that of the recess surrounding a bore so that it is extended to the edge of the base plate.
8. A jet nozzle plate for an ink jet printing head comprising a blase plate of a first material, a plurality of cylindrical bores being provided in said base plate, the wall of each bore being lined with a layer of a second material, said layer extending beyond an end of said bore to form a freely projecting cylindrical tube that is surrounded by an annular trough in the base plate, which is adjoined by a surrounding dam covered by a layer of the second material, said first and second materials being selectively chemically etchable.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0549380A AT368283B (en) | 1980-11-07 | 1980-11-07 | NOZZLE PLATE FOR AN INK JET PRINT HEAD AND METHOD FOR PRODUCING SUCH A NOZZLE PLATE |
| ATA5493/80 | 1980-11-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1176437A true CA1176437A (en) | 1984-10-23 |
Family
ID=3576416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000389479A Expired CA1176437A (en) | 1980-11-07 | 1981-11-05 | Jet nozzle plate for an ink jet printing head and method of manufacturing such a jet nozzle plate |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4422082A (en) |
| JP (1) | JPS57113078A (en) |
| AT (1) | AT368283B (en) |
| CA (1) | CA1176437A (en) |
| DE (1) | DE3142697A1 (en) |
| FR (1) | FR2495060A1 (en) |
| GB (1) | GB2086807B (en) |
| IT (1) | IT1140048B (en) |
| SE (1) | SE443327B (en) |
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| JPS59192577A (en) * | 1983-04-18 | 1984-10-31 | Matsushita Electric Ind Co Ltd | Ink jet recorder |
| US4613875A (en) * | 1985-04-08 | 1986-09-23 | Tektronix, Inc. | Air assisted ink jet head with projecting internal ink drop-forming orifice outlet |
| US5195243A (en) * | 1992-02-28 | 1993-03-23 | General Motors Corporation | Method of making a coated porous metal panel |
| US5381166A (en) * | 1992-11-30 | 1995-01-10 | Hewlett-Packard Company | Ink dot size control for ink transfer printing |
| DE4336416A1 (en) * | 1993-10-19 | 1995-08-24 | Francotyp Postalia Gmbh | Face shooter ink jet printhead and process for its manufacture |
| US5474032A (en) * | 1995-03-20 | 1995-12-12 | Krietzman; Mark H. | Suspended feline toy and exerciser |
| US5659346A (en) * | 1994-03-21 | 1997-08-19 | Spectra, Inc. | Simplified ink jet head |
| US5901425A (en) * | 1996-08-27 | 1999-05-11 | Topaz Technologies Inc. | Inkjet print head apparatus |
| JP3809706B2 (en) * | 1997-06-16 | 2006-08-16 | ブラザー工業株式会社 | Ink jet printer head and method for processing and inspecting ink jet printer head |
| AUPP654598A0 (en) | 1998-10-16 | 1998-11-05 | Silverbrook Research Pty Ltd | Micromechanical device and method (ij46h) |
| AUPP653498A0 (en) | 1998-10-16 | 1998-11-05 | Silverbrook Research Pty Ltd | Micromechanical device and method (ij46a) |
| AUPP654398A0 (en) | 1998-10-16 | 1998-11-05 | Silverbrook Research Pty Ltd | Micromechanical device and method (ij46g) |
| AUPP653998A0 (en) | 1998-10-16 | 1998-11-05 | Silverbrook Research Pty Ltd | Micromechanical device and method (ij46B) |
| CA2330950A1 (en) | 1998-05-12 | 1999-11-18 | E Ink Corporation | Microencapsulated electrophoretic electrostatically-addressed media for drawing device applications |
| US6742873B1 (en) | 2001-04-16 | 2004-06-01 | Silverbrook Research Pty Ltd | Inkjet printhead construction |
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| US20050156340A1 (en) | 2004-01-20 | 2005-07-21 | E Ink Corporation | Preparation of capsules |
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| US7303259B2 (en) * | 2003-12-30 | 2007-12-04 | Fujifilm Dimatix, Inc. | Drop ejection assembly |
| DK177764B1 (en) * | 2004-09-02 | 2014-06-16 | Pelle Nicolaisen | System for hanging repetitions on walls |
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| WO2009155245A1 (en) * | 2008-06-17 | 2009-12-23 | Davicon Corporation | Liquid dispensing apparatus using a passive liquid metering method |
| KR20110081888A (en) * | 2008-10-31 | 2011-07-14 | 후지필름 디마틱스, 인크. | Shaping a nozzle outlet |
| US8197029B2 (en) * | 2008-12-30 | 2012-06-12 | Fujifilm Corporation | Forming nozzles |
| US8681493B2 (en) | 2011-05-10 | 2014-03-25 | Kla-Tencor Corporation | Heat shield module for substrate-like metrology device |
| JP6271905B2 (en) * | 2013-08-07 | 2018-01-31 | キヤノン株式会社 | Liquid discharge head, liquid discharge apparatus, and method of manufacturing liquid discharge head |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4007464A (en) * | 1975-01-23 | 1977-02-08 | International Business Machines Corporation | Ink jet nozzle |
| US3949410A (en) * | 1975-01-23 | 1976-04-06 | International Business Machines Corporation | Jet nozzle structure for electrohydrodynamic droplet formation and ink jet printing system therewith |
| US4106976A (en) * | 1976-03-08 | 1978-08-15 | International Business Machines Corporation | Ink jet nozzle method of manufacture |
| US4169008A (en) * | 1977-06-13 | 1979-09-25 | International Business Machines Corporation | Process for producing uniform nozzle orifices in silicon wafers |
| US4106975A (en) * | 1977-06-30 | 1978-08-15 | International Business Machines Corporation | Process for etching holes |
-
1980
- 1980-11-07 AT AT0549380A patent/AT368283B/en active
-
1981
- 1981-10-26 US US06/314,931 patent/US4422082A/en not_active Expired - Fee Related
- 1981-10-28 DE DE19813142697 patent/DE3142697A1/en not_active Withdrawn
- 1981-11-04 GB GB8133264A patent/GB2086807B/en not_active Expired
- 1981-11-04 SE SE8106507A patent/SE443327B/en not_active IP Right Cessation
- 1981-11-04 IT IT24860/81A patent/IT1140048B/en active
- 1981-11-05 CA CA000389479A patent/CA1176437A/en not_active Expired
- 1981-11-06 JP JP56177320A patent/JPS57113078A/en active Granted
- 1981-11-06 FR FR8120821A patent/FR2495060A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| FR2495060A1 (en) | 1982-06-04 |
| AT368283B (en) | 1982-09-27 |
| GB2086807B (en) | 1984-08-08 |
| SE8106507L (en) | 1982-05-08 |
| GB2086807A (en) | 1982-05-19 |
| DE3142697A1 (en) | 1982-06-24 |
| FR2495060B1 (en) | 1984-09-21 |
| ATA549380A (en) | 1982-01-15 |
| IT1140048B (en) | 1986-09-24 |
| US4422082A (en) | 1983-12-20 |
| JPS6348715B2 (en) | 1988-09-30 |
| IT8124860A0 (en) | 1981-11-04 |
| SE443327B (en) | 1986-02-24 |
| JPS57113078A (en) | 1982-07-14 |
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