CN102189648A - Flat topped bifocals model core of polycarbonate (PC) lens used for eyes - Google Patents
Flat topped bifocals model core of polycarbonate (PC) lens used for eyes Download PDFInfo
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- CN102189648A CN102189648A CN2011100878205A CN201110087820A CN102189648A CN 102189648 A CN102189648 A CN 102189648A CN 2011100878205 A CN2011100878205 A CN 2011100878205A CN 201110087820 A CN201110087820 A CN 201110087820A CN 102189648 A CN102189648 A CN 102189648A
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- slice
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- sheet
- cambered surface
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Abstract
The invention relates to a flat topped bifocals model core of polycarbonate (PC) lens used for eyes, which comprises a main slice (1), a secondary slice (2). The main slice (1) and the secondary slice (2) possesses the cambered surfaces with different radians, the secondary slice (2) is a part of the cambered surface of the main slice (1), the main slice (1) and the secondary slice (2) are combined as an integral body. The secondary slice (2) is an incomplete arc. According to the invention, a main mirror and a secondary mirror are designed on one model core, a multiple focus lenses injection molding can be realized, life and optical stability can be raised, small flash at the secondary mirror interface of added degree part can be eliminated; the junctions are connected with the different arcs, the problem that the stripes are generated by centrifugal force during discoloration spin-coating can be solved.
Description
Technical field
The present invention relates to the two optical mode benevolence of a kind of flat-top, relate in particular to a kind of two optical mode benevolence of flat-top of PC eye lens.
Background technology
Bifocal lenses is divided into eyeglass two vision areas usually: to being called of looking usefulness far away corrects far away with the district, look the far field; Near to being called of looking nearly usefulness corrects with district, near reading range or read area.Near equal to look when near and the difference of looking the focal power when far away with additional focal power, FA=FN-FD, so closely often represent with the additional focal power of nearly usefulness with prescription, far away with then adding a positive sphere focal power (as Add:FA) that suits on writing out a prescription again.
Bifocal lenses often is regarded as closely combining of two eyeglasses, be that main leaf is used as and looks rectification far away, add a sub-sheet as looking nearly rectification and paste on main leaf, the refractive power of this sub-sheet should just be closely to use the number of degrees that add (certainly sometimes also can be with above-mentioned opposite, promptly main leaf is looked near, sub-sheet and looked far) as can be known again.
The thermosetting resin eye lens development that present China is representative with CR39 is rapid, and the glass mold of wherein producing the flat-top Bifocal lenses is also comparatively ripe.And reflect owing to it is high as the PC eyeglass of the second generation, safety, light, characteristics such as 100% anti-UV just progressively develop, but the difference of internal is arranged owing to the production technology that is thermoplastic and thermosets, so many technologies, the die die holder that is directly used in the injection moulding eyeglass is especially being groped middle development.
Existing pair of optical mode benevolence adopts the inserts design usually, as shown in Figure 1, because of inserts 2 ' and plastic 1 ' thereof, shrink inhomogeneously, cause very big internal stress, can make plastic produce crooked or fracture, cause its service life shorter, and because its main leaf 1 ' is separated with sub-sheet 2 ', gap 3 ' appear in assembling unavoidably, when the eyeglass injection moulding, add light parton mirror during injection moulding and occur tiny overlap all around easily.In addition, occur the striped that centrifugal force produces during the variable color spin coating, influence outward appearance and use.
Summary of the invention
The service life that the present invention causes in order to solve aforementioned prior art employing inserts design is the problem of weak point, the tiny overlap of sub-mirror and spin coating generation striped, has proposed the lens mould design of one in, and specifically scheme is as follows:
The two optical mode benevolence of the flat-top of PC eye lens comprise main leaf, sub-sheet, and main leaf, sub-sheet are the cambered surface of different radians, and sub-sheet is the part of main leaf cambered surface, and sub-sheet is an integral body with main leaf.
Further, described sub-sheet is an imperfect circular arc.
Further, the perspective plane radius of described main leaf is that 32.5～40mm, spherical radius are that 93.31～1177.78mm, the center of circle are O
1, the perspective plane radius of sub-sheet cambered surface 2 is that 61.06～365.52mm, spherical radius are that 56～410mm, the center of circle are O
2, O
1O
2Between the distance be 3～15mm.
Further, by the cambered surface transition, this spherical radius is 0.1～0.3mm to described main leaf with sub-sheet.
The present invention has realized the multifocal lens injection moulding by designing primary mirror and sub-mirror on a die, improves life-span and optical stability, eliminates the tiny overlap that adds light parton mirror interface.
The junction of primary mirror of the present invention and sub-mirror is connected with different circular arcs, occurs asking of striped that centrifugal force produces when solving the variable color spin coating.
The present invention has reduced production cost: when the early stage machined, can save process time; Reduced difficulty of processing; Reduced the installation time of sub-mirror and primary mirror; Prolonged the service life of die.
The present invention has also created advantage for later process: avoid producing when sclerosis immersion plating the stream that hangs down; Avoid when the variable color spin coating, occurring the striped that centrifugal force produces.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the prior art accompanying drawing;
Fig. 2 is the schematic perspective view of the embodiment of the invention;
Fig. 3 is the front view of the embodiment of the invention;
Fig. 4 is that the A-A of the embodiment of the invention is to cutaway view;
Fig. 5 is that the B-B of the embodiment of the invention is to cutaway view;
Fig. 6 is that the C-C of the embodiment of the invention is to cutaway view;
The specific embodiment
See also Fig. 1, as shown in Figure 2, die of the present invention is phantom benevolence one by one, and its matrix is, i.e. main leaf, and a cambered surface 1, a part of projection is a cambered surface 2 than long radius, less radian in the cambered surface 1, promptly sub-sheet.
As shown in Figure 3, be the front view of the embodiment of the invention, the corresponding points that the centre of sphere of die of the present invention is projeced on the front view are O
3, the 1 ' center of circle, perspective plane of arc surface l is O
1, perspective plane 1 ' radius is 32.5～40mm, and optimum value is 36.5mm, and the 2 ' center of circle, perspective plane of cambered surface 2 is O
2, perspective plane 2 ' radius is 61.06-365.52mm, O
1O
2Between distance be 3～15mm, optimum value is for deciding according to the most general use location.Cambered surface 2 is an imperfect arc surface, is cut off forming by an arc surface, and its secant is to center of circle O
2Distance is 3～6mm, and optimum value is decided according to the most general use location.
As shown in Figure 4, die cambered surface 1 center line A-A is to section, and promptly the radius of cambered surface 1 is 93.31～1177.78mm.
As shown in Figure 5, die cambered surface 2 cross central line B-B are to section, and promptly the radius of cambered surface 2 is 56～410mm.
As shown in Figure 6, die cambered surface 2 longitudinal centre line C-C are to section, and center line CC as shown in Figure 3, and is perpendicular with secant.Its cambered surface 1 to the transitioning end of cambered surface 2 is cambered surface 0.1～0.3mm.
Claims (4)
1.PC the two optical mode benevolence of the flat-top of eye lens comprise main leaf (1), sub-sheet (2), main leaf (1), sub-sheet (2) are the cambered surface of different radians, and sub-sheet (2) is the part of main leaf (1) cambered surface, it is characterized in that, the same main leaf of sub-sheet (2) (1) is an integral body.
2. the two optical mode benevolence of flat-top as claimed in claim 1 is characterized in that described sub-sheet (2) is an imperfect circular arc.
3. the two optical mode benevolence of flat-top as claimed in claim 1 is characterized in that the perspective plane radius of described main leaf (1) is that 32.5～40mm, spherical radius are that 93.31～1177.78mm, the center of circle are O
1, the perspective plane radius of sub-sheet (2) cambered surface 2 is that 61.06～365.52mm, spherical radius are that 56～410mm, the center of circle are O
2, O
1O
2Between the distance be 3～15mm.
4. the two optical mode benevolence of flat-top as claimed in claim 1 is characterized in that by the cambered surface transition, this spherical radius is 0.1～0.3mm to described main leaf (1) with sub-sheet (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100878205A CN102189648A (en) | 2011-04-08 | 2011-04-08 | Flat topped bifocals model core of polycarbonate (PC) lens used for eyes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100878205A CN102189648A (en) | 2011-04-08 | 2011-04-08 | Flat topped bifocals model core of polycarbonate (PC) lens used for eyes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102189648A true CN102189648A (en) | 2011-09-21 |
Family
ID=44598935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100878205A Pending CN102189648A (en) | 2011-04-08 | 2011-04-08 | Flat topped bifocals model core of polycarbonate (PC) lens used for eyes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102189648A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6007747A (en) * | 1987-08-24 | 1999-12-28 | Pharmacia & Upjohn Company | Method of making an aspheric soft lens |
| CN201540412U (en) * | 2009-09-28 | 2010-08-04 | 福州朝日光学科技有限责任公司 | Mould for manufacturing bifocal lens |
| CN202241806U (en) * | 2011-04-08 | 2012-05-30 | 上海嘉视光学科技有限公司 | Flat-top and double-light mold insert of PC eye lens |
-
2011
- 2011-04-08 CN CN2011100878205A patent/CN102189648A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6007747A (en) * | 1987-08-24 | 1999-12-28 | Pharmacia & Upjohn Company | Method of making an aspheric soft lens |
| CN201540412U (en) * | 2009-09-28 | 2010-08-04 | 福州朝日光学科技有限责任公司 | Mould for manufacturing bifocal lens |
| CN202241806U (en) * | 2011-04-08 | 2012-05-30 | 上海嘉视光学科技有限公司 | Flat-top and double-light mold insert of PC eye lens |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110921 |