WO1988005589A1 - Light transmitting plate member - Google Patents
Light transmitting plate member Download PDFInfo
- Publication number
- WO1988005589A1 WO1988005589A1 PCT/DK1988/000005 DK8800005W WO8805589A1 WO 1988005589 A1 WO1988005589 A1 WO 1988005589A1 DK 8800005 W DK8800005 W DK 8800005W WO 8805589 A1 WO8805589 A1 WO 8805589A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- plate member
- light transmitting
- transmitting plate
- light
- side edge
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F13/00—Illuminated signs; Luminous advertising
- G09F13/18—Edge-illuminated signs
- G09F2013/1804—Achieving homogeneous illumination
- G09F2013/1809—Achieving homogeneous illumination using a non-homogeneous front window
- G09F2013/1813—Achieving homogeneous illumination using a non-homogeneous front window provided with a coating showing a pattern of dots of variable density
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S362/00—Illumination
- Y10S362/812—Signs
Definitions
- the present invention relates to a light transmitting plate member for illuminated signs, illuminated tables or similar illuminated flat items and of the type described in the introductory part of claim 1.
- a such light transmitter or light source by way of example is known from the description to Danish Patent Application No. 3800/84. Furthermore, this known light source in general is described in the earlier published description to US Patent No. 3,464,133 dealing with a display apparatus comprising a number of successively activated light sources as the apparatus is adapted to animate a multi-dimensional picture when this is observed from the front side of a prismatic light transmitter being illuminated from a narrow side edge by means of one or more light sources.
- the invention has for its purpose to provide an improved light transmitting plate member of the introductory described type and by means of which by simple measures may be obtained a considerably better and uniform diffusion of light - also by light transmitting plate members having a considerable length.
- the light transmitting plate member is characterized by said side with the gradual slope being provided with a number of angled divisions which are defined by transverse divisional lines which in general run parallel to said first side edge and which are positioned with either uniform intervals or with graded intervals which are reduced in the direction receeding from said first side edge, in that the height or the thickness of the light transmitting plate member at the transverse divisional lines in general corresponds to the thickness of the light transmitting plate member at said first side edge, whose angled divisions from said divisional lines and in the direction away from said first side edge have reducing thicknesses, i.e. are inclined in relation to a reference plane parallel to said first particular plane side of the light transmitting plate member.
- the light transmitting plate member according to the invention shows a considerably increased efficiency as to uniform light diffusion ability - even with a rather considerable total length.
- the light transmitting plate member according to the invention may be produced from a rather cheap acryl plate, e.g.
- PL-lamp having an initial thickness of about 10 mm and with a length of up to about 1400 mm and a width which nearly alone is determined by the width of the item which is to be illuminated - and of course the actual used light source i.e. the length of, by way of example, a low voltage tube lamp (PL-lamp).
- PL-lamp low voltage tube lamp
- angles of inclination of said angled divisions of said opposite side and the said mutual lengths between said divisional lines are varied in such a manner that each of said angled divisions or gradual slopes are illuminated approximately uniform by light diffusion from the the respective sides of the light tra smitting plate member, of which the said first preferable plane side is considered as the front side of the light transmitting pl ate member which is pref erably turned again st the item which is to be illuminated e.g. a sign plate, while said opposite side of the light transmitting plate member with said gradual slopes is considered as the rear side of the light transmitting plate member whereby preferably a reflector is positioned being adapted to reflect the light right through the light transmitting plate member, i.e. out through the plane front side thereof.
- the light transmitting plate member is produced from a preferably plane acryl plate of minor thickness, e.g., 5 - 15 mm, preferably 10 mm and with a considerable length, e.g. 200 - 1400 mm, preferably about 1200 mm, as said angled divisions are varying from about 0.1° - 5° nearest at said first side edge to about 5° - 20° farthest of from said first side edge - dependent on the total length of the light transmitting plate member.
- Fig. 1 is a side view - partly in section - of an embodiment of a light transmitting plate member according to the invention, shown almost in natural size in five parts
- Fig. 2 is a side view - partly in section - of another embodiment of a light transmitting plate member according to the invention.
- Fig. 3 is a perspective view of an illuminated sign provided with a light transmitting plate member according to the invention.
- Fig. 4 is a perspective view of the illuminated sign shown in Fig. 3 - seen from the opposite side.
- the light transmitting plate member shown in Fig. 1 is - as alluded - produced from a limpid acryl plate with an initial thickness of about 10 mm and with a plate geometry which is shown in the below table 1, in which the lengths of the left column are representing the longitudinal extent of angled divisions 4 of the light transmitting plate member which as a unit is designated 2 as the length of the angled divisions
- table 1 is shortened by omission of some partial sections of the plate geometry of the light transmitting plate member 2.
- the middle column of table 1 shows the height or the thickness of the light transmitting plate member 2 at the respective crossings between said angled divisions 4, while the right column of table 1 shows the respective inclination angles of the divisions in relation to a reference plane parallel to the plane front side 8 , as the vertical intervals between the divisions 4. are indicated as 90° angles.
- the plate geometry shown is calculated by computer as the length of each divisions 4 and the plate thickness at the crossings between the divisions have been kept as predetermined constants on 20 and 10 mm, respectively. Besides, the method of calculation has aspired to uniform light diffusion in the light transmitting plate member 2 which by way of calculation has been supplied with pencils of light rays which have been introduced from the center of the left side edge 6 by angles of incidence from -42° to +42°
- FIG. 2 Another embodiment of a light transmitting plate member 12 according to the invention is shown in Fig. 2. This light transmitting plate member 12 is also produced from limpid
- the plate geometry is also calculated by means of a computer - as assumption has been constant values of the heights or the plate thickness at the crossings between the divisions 16 and predetermined angle intervals of the angles of inclination of the angled divisions 16, viz. an initial angle on -0.5° adjacent to the left side edge 18 of the light transmitting plate member 12 to a final angle of -7.0° farthest away from the side edge 18.
- the respective lengths of the divisions 16 are then calculated as indicated in the left column of table 2 and in Fig. 2, respectively.
- the light transmitting plate member 12 is as the case of the light transmitting plate member 2 shown in Fig. 1 produced from a limpid acryl plate with an initial plate thickness of 10 mm and a total length of about 550 mm.
- the illuminated sign 22 shown in Figs. 3 and 4 is provided with a light transmitting plate, member 24 of the same type as the light transmitting plate member 2 cfr.
- Fig. 1 and table 1 i.e. with uniform longitudinal extension of the angled divisions 4 and with increasing angles of inclination seen in the direction receeding from the side edge 6, whereby a light source in the form of a tubular lamp 26 is placed in a lamp housing 28 into which is inserted the side edge 6 of the light transmitting plate member 2.
- the lamp housing 28 and the illuminated sign 22 as a whole is surrounded of a not shown light tight edge frame in which furthermore a rearmost reflector plate member 30, the light transmitter 2 and a front sign plate member 32 are mounted.
- the sign plate member 32 consists of an opalescent glass plate or a white transparent acryl plate on which the actual sign text or other sign decoration is directly printed.
- the tubular lamp 26 of the illuminated sign 22 is surrounded by a reflector shade 34 being tightly connected to the side edge 6 of the light transmitter 2.
- the tubular lamp 26 used may be a low voltage lamp, e.g. 9 W , PL-lamp, which has shown to be satisfactory to illuminate a sign plate of 200 x 1200 mm in an approximately quite uniform manner.
- a further and alternative plate geometry of the light transmitting plate member appears from table 3 below, where the assumptions for the calculation have been the number, viz. 10 angled divisions and constant values of the heights or the plate thickness at the crossings between the respective angled divisions. These heights are cfr. the middle column constant, viz. 8 and 10 mm, respectively.
- table 3 also shows varying angles of inclination of the angled divisions as varying longitudinal extension of the angled divisions which as earlier all are measured from the side edge where the light source is adapted to be placed.
- the light-technical assumptions have been the same as in tables 1 and 2.
- the light diffusion in % for an alternative light transmitting plate member with a total length of 1200 mm, a plate thickness of 10 mm, 40 numbers of sloped surfaces each with a length of 30 mm, an initial angle of -0.450° and a final angle of -10.000° (i.e. a light transmitting plate member of the same type as shown in Fig. 1 and table 1, respectively).
- Table 4 indicates the light diffusion, i.e. the amount of light radiated from divisions of 120 mm (corresponding to 4 angled divisions of each 30 mm) of as well the plane front side as the "saw-tooth-scaped" rear side.
- the total amount of light from the respective divisions is indicated as it is assumed that all light radiates through the plane front side to the sign plate, because a reflector plate member is placed at the rear side of the light transmitting plate member.
- Cfr. table 4 no light at all radiates from the respective surfaces of the first division of the light transmitter, because this, in the example of calculation, has been effectively screened to both sides.
- Table 4 indicates the efficiency of the light tranmitting plate member as to very uniform diffusion of light which is introduced from the front side edge.
- Such a double sign system may comprise two light transmitting plate members illuminated by lamps from opposite ends so that farthest side edge of both light transmitting plate members may be directly interconnected, whereby also the light radiation from both "farthest" side edges may be effectively exploited.
- an illuminated sign may have a total length of more than 2000 mm. without the sign needing to be correspondingly extra thic k and extra heavy to handle.
- a further alternative embodiment of the light transmitting plate member according to the invention may consist in that the light transmitter adjacent to the light source, i.e. at the first division, has an extra strongly graduated slope after which the succeeding divisions again have very little graduated slope with successively increasing angles of inclination in the direction receeding from the light source.
- Such alternative embodiment of the light transmitter according to the invention may advantageously be used in particular cases where one due to certain reasons is forced to use a light source of less efficiency. In such a case it may even be actual to use a light transmitter with increased thickness, e.g. the double thickness, at the front side edge, while the light transmitter already after first division again is of "normal" thickness.
- a light transmitting plate member cfr. the invention with a very little initial thickness, e.g. on 5 mm or even less.
- the light transmitting plate member according to the invention may also be produced by casting which by the way is a method which is very often used when producing, plate-scaped items from acryl or similar materials.
- the light transmitting plate member according to the invention consists of limpid acryl, but of course nothing would prevent production of the light transmitting plate member as described from tranparent, coloured artificial resin, such as acryl.
- the introduction of light into the front side edge of the light transmitter may according to a method known per see be improved by providing said side edge with a gradual slope in relation to the plane front side of the light transmitting plate member; or the said side edge thereof may be provided with a very weak curve, i.e. concave, whereby the introduction of rays of light may be more effective. If the foremost side edge portion of the light transmitter is inserted somehow into the lamp housing, it would furthermore be possible to improve the transmission of light through the light transmitting plate member by applying one or both opposite side surfaces thereof with a silvering which of course may not extend outside the lamp housing.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK496788A DK496788A (en) | 1987-01-15 | 1988-09-07 | PLATFORM LIGHT |
FI884203A FI884203A (en) | 1987-01-15 | 1988-09-13 | LJUS TRANSMITTERANDE SKIVSTYCKE. |
NO884081A NO884081L (en) | 1987-01-15 | 1988-09-14 | LIGHT THROUGH PLATE ORGAN. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK021487A DK21487D0 (en) | 1987-01-15 | 1987-01-15 | PLATFORM LIGHT |
DK0214/87 | 1987-01-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1988005589A1 true WO1988005589A1 (en) | 1988-07-28 |
Family
ID=8091022
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DK1988/000005 WO1988005589A1 (en) | 1987-01-15 | 1988-01-14 | Light transmitting plate member |
Country Status (8)
Country | Link |
---|---|
US (1) | US4890201A (en) |
EP (1) | EP0298106A1 (en) |
JP (1) | JPH01502697A (en) |
AU (1) | AU1180988A (en) |
DK (2) | DK21487D0 (en) |
FI (1) | FI884203A (en) |
NO (1) | NO884081L (en) |
WO (1) | WO1988005589A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1989011713A1 (en) * | 1988-05-19 | 1989-11-30 | Stanilite Pacific Ltd. | Luminaire for signs |
WO1990010823A1 (en) * | 1987-09-18 | 1990-09-20 | Claude Courageux | Light diffuser |
WO1990013885A1 (en) * | 1989-05-02 | 1990-11-15 | Lydia Wustlich Vertrieb Elektronischer Bauteile | Surface display for illuminating background surfaces |
WO1994023244A1 (en) * | 1993-03-29 | 1994-10-13 | Precision Lamp, Inc. | Flat thin uniform thickness large area light source |
GB2310525A (en) * | 1996-02-24 | 1997-08-27 | Ronnie Revell | Illuminated display device |
WO1998048216A1 (en) * | 1997-04-22 | 1998-10-29 | Ford Global Technologies, Inc. | An illuminator |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1316159C (en) * | 1987-05-08 | 1993-04-13 | Sanford Cobb, Jr. | High aspect ratio light fixture and film for use therein |
US5005108A (en) * | 1989-02-10 | 1991-04-02 | Lumitex, Inc. | Thin panel illuminator |
JPH0365982A (en) * | 1989-08-03 | 1991-03-20 | Pioneer Electron Corp | Display board illuminating device for display device |
US5372756A (en) * | 1990-04-11 | 1994-12-13 | Oyama; Nobuo | Method of forming striated light diffuser |
US5168646A (en) * | 1990-06-01 | 1992-12-08 | Ncm International, Inc. | Visual effect graphic and method of making same |
US5641219A (en) * | 1990-06-22 | 1997-06-24 | Mizobe; Tatsuji | Uniform illumination light emitting device |
US5128842A (en) * | 1991-06-03 | 1992-07-07 | Sunarrow Co., Inc. | Uniform illumination plate |
JP2601766Y2 (en) * | 1992-08-31 | 1999-12-06 | 日本電産コパル株式会社 | Surface emitting device |
US5390085A (en) * | 1993-11-19 | 1995-02-14 | Motorola, Inc. | Light diffuser for a liquid crystal display |
AU4409496A (en) * | 1994-11-29 | 1996-06-19 | Precision Lamp, Inc. | Edge light for panel display |
US5613751A (en) | 1995-06-27 | 1997-03-25 | Lumitex, Inc. | Light emitting panel assemblies |
US7108414B2 (en) * | 1995-06-27 | 2006-09-19 | Solid State Opto Limited | Light emitting panel assemblies |
US6712481B2 (en) | 1995-06-27 | 2004-03-30 | Solid State Opto Limited | Light emitting panel assemblies |
DE19853106A1 (en) * | 1998-11-18 | 2000-05-31 | Bayer Ag | Fluorescent, structured shaped bodies |
US6827456B2 (en) | 1999-02-23 | 2004-12-07 | Solid State Opto Limited | Transreflectors, transreflector systems and displays and methods of making transreflectors |
US6161939A (en) * | 1999-05-05 | 2000-12-19 | Semperlux Ag | Interior lighting fixture |
US6895705B2 (en) * | 2003-05-15 | 2005-05-24 | Marketing Display, Inc. | Light panel |
GB0321836D0 (en) * | 2003-09-18 | 2003-10-15 | Ambisol Signage And Lighting L | Improvements in and relating to backlit displays |
US8462292B2 (en) | 2008-07-31 | 2013-06-11 | Rambus Delaware Llc | Optically transmissive substrates and light emitting assemblies and methods of making same, and methods of displaying images using the optically transmissive substrates and light emitting assemblies |
US10739513B2 (en) | 2018-08-31 | 2020-08-11 | RAB Lighting Inc. | Apparatuses and methods for efficiently directing light toward and away from a mounting surface |
US10801679B2 (en) | 2018-10-08 | 2020-10-13 | RAB Lighting Inc. | Apparatuses and methods for assembling luminaires |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3464133A (en) * | 1965-04-30 | 1969-09-02 | Marcel C K De Poray | Display apparatus |
US4059916A (en) * | 1975-01-30 | 1977-11-29 | Copal Company Limited | Light diffusing device |
US4528617A (en) * | 1982-02-08 | 1985-07-09 | Sheltered Workshop For The Disabled, Inc. | Light distribution apparatus |
DE3542292A1 (en) * | 1985-01-28 | 1986-07-31 | Comind Spa | Luminaire for a motor vehicle |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2247969A (en) * | 1937-12-31 | 1941-07-01 | Adlake Co | Edge glow lighting system |
US4257084A (en) * | 1979-02-21 | 1981-03-17 | Reynolds Christopher H | Display device |
FR2514105A1 (en) * | 1981-10-05 | 1983-04-08 | Cibie Projecteurs | LIGHT-DRIVEN PROJECTOR FOR MOTOR VEHICLES |
EP0167721B1 (en) * | 1984-07-02 | 1989-10-11 | Mitsubishi Rayon Co., Ltd. | Light diffuser |
US4791540A (en) * | 1987-05-26 | 1988-12-13 | Minnesota Mining And Manufacturing Company | Light fixture providing normalized output |
-
1987
- 1987-01-15 DK DK021487A patent/DK21487D0/en unknown
-
1988
- 1988-01-14 WO PCT/DK1988/000005 patent/WO1988005589A1/en not_active Application Discontinuation
- 1988-01-14 JP JP63501287A patent/JPH01502697A/en active Pending
- 1988-01-14 AU AU11809/88A patent/AU1180988A/en not_active Abandoned
- 1988-01-14 EP EP88901028A patent/EP0298106A1/en not_active Withdrawn
- 1988-09-07 DK DK496788A patent/DK496788A/en not_active Application Discontinuation
- 1988-09-13 FI FI884203A patent/FI884203A/en not_active IP Right Cessation
- 1988-09-14 NO NO884081A patent/NO884081L/en unknown
- 1988-12-22 US US07/288,129 patent/US4890201A/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3464133A (en) * | 1965-04-30 | 1969-09-02 | Marcel C K De Poray | Display apparatus |
US4059916A (en) * | 1975-01-30 | 1977-11-29 | Copal Company Limited | Light diffusing device |
US4528617A (en) * | 1982-02-08 | 1985-07-09 | Sheltered Workshop For The Disabled, Inc. | Light distribution apparatus |
DE3542292A1 (en) * | 1985-01-28 | 1986-07-31 | Comind Spa | Luminaire for a motor vehicle |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1990010823A1 (en) * | 1987-09-18 | 1990-09-20 | Claude Courageux | Light diffuser |
WO1989011713A1 (en) * | 1988-05-19 | 1989-11-30 | Stanilite Pacific Ltd. | Luminaire for signs |
WO1990013885A1 (en) * | 1989-05-02 | 1990-11-15 | Lydia Wustlich Vertrieb Elektronischer Bauteile | Surface display for illuminating background surfaces |
WO1994023244A1 (en) * | 1993-03-29 | 1994-10-13 | Precision Lamp, Inc. | Flat thin uniform thickness large area light source |
US5420761A (en) * | 1993-03-29 | 1995-05-30 | Precision Lamp, Inc. | Flat, thin, uniform thickness large area light source |
GB2310525A (en) * | 1996-02-24 | 1997-08-27 | Ronnie Revell | Illuminated display device |
WO1998048216A1 (en) * | 1997-04-22 | 1998-10-29 | Ford Global Technologies, Inc. | An illuminator |
Also Published As
Publication number | Publication date |
---|---|
US4890201A (en) | 1989-12-26 |
DK496788D0 (en) | 1988-09-07 |
DK496788A (en) | 1988-09-07 |
FI884203A0 (en) | 1988-09-13 |
JPH01502697A (en) | 1989-09-14 |
AU1180988A (en) | 1988-08-10 |
NO884081L (en) | 1988-11-14 |
DK21487D0 (en) | 1987-01-15 |
EP0298106A1 (en) | 1989-01-11 |
FI884203A (en) | 1988-09-13 |
NO884081D0 (en) | 1988-09-14 |
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