EP0545429A2
Expired / Lapsed
EP
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Surface lighting device and a display having such a lighting device
Assignee: Canon Inc
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Filing: 1992-12-04
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Granted: —
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Expires: 2012-12-04
Abstract
Abstract A surface lighting device receiving incident rays through two opposing faces of a light guide from light source to emit the incident rays from a face different from the two faces. The light guide is divided into plural divisions which are jointed together.
Inventors
- 👤 Toshiyuki c/o Canon Kabushiki Kaisha Kanda
- 👤 Hisao C/O Canon Kabushiki Kaisha Tajima
- 👤 Hiroshi C/O Canon Kabushiki Kaisha Takabayashi
- 👤 Takashi c/o Canon Kabushiki Kaisha Yamamoto
- 👤 Hideo C/O Canon Kabushiki Kaisha Mori
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 18:24
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0033; G02B6/005; G02B6/0051; G02B6/0055; G02B6/0066; G02B6/007; G02B6/0071; G02B6/0081; G02B6/0086; G02B6/009; G09; G09F; G09F13/00; G09F13/04; G09F13/0409; G02B6/0013; G02B6/0023; G02B6/0026; G02B6/0035; G02B6/0045; G02B6/0046; G02B6/0058; G02B6/0061; G02B6/0068; G09F13/0418; G09F13/0454; G09F13/18; G09F2013/1804; G09F2013/1827; G09F2013/1831; Y; Y10; Y10S; Y10S385/00; Y10S385/901
Claims Analysis
Total Claims: 65
Claim 1
Independent Claim
44 words
A surface lighting device receiving incident rays through two opposing faces of a light guide from light source to emit the incident rays from a face different from said two faces, wherein said light guide is divided into plural divisions which are joined together.
Claim 2
Dependent Claim
17 words
A surface lighting device according to Claim 1, wherein said light source is a linear light source.
Claim 3
Dependent Claim
33 words
A surface lighting device according to Claim 1, wherein said light source is a linear light source, and said light guide is divided at a positions in parallel to said linear light source.
Claim 4
Dependent Claim
27 words
A surface lighting device according to Claim 1, wherein said light guide is divided at positions having equal distances or substantially equal distances from said light source.
Claim 5
Dependent Claim
22 words
A surface lighting device according to Claim 1, wherein the junction of said light guide is made by adhesives, setting, or welding.
Claim 6
Dependent Claim
15 words
A surface lighting device according to Claim 5, wherein said welding is a ultrasonic welding.
Claim 7
Dependent Claim
17 words
A surface lighting device according to Claim 1, wherein said light guide is divided in linear symmetry.
Claim 8
Dependent Claim
37 words
A surface lighting device according to Claim 1, wherein said light guide is divided at positions in the central or substantially central portion of said light source and parallel or substantially parallel to said two opposing faces.
Claim 9
Dependent Claim
34 words
A surface lighting device according to Claim 8, wherein said light guide is further divided at positions having an equal distance or substantially equal distance from said positions where the light guide is divided.
Claim 10
Dependent Claim
19 words
A surface lighting device according to Claim 1, wherein said light guide is divided into at least three portions.
Claim 11
Dependent Claim
34 words
A surface lighting device according to Claim 10, wherein the junctions between surfaces of said light guide are inclined to the surface to which the rays of light from the light guide are irradiated.
Claim 12
Dependent Claim
28 words
A surface lighting device according to Claim 11, wherein the angles of said inclination are 245° to 90° to the face opposite to said surface to be irradiated.
Claim 13
Dependent Claim
32 words
A surface lighting device according to Claim 4, wherein the junctions between surfaces of said light guide are inclined to the face to emit the rays of light from the light guide.
Claim 14
Dependent Claim
27 words
A surface lighting device according to Claim 13, wherein the angles of said inclination are 245° to 90° to the face opposite to said face of emission.
Claim 15
Dependent Claim
28 words
A surface lighting device according to Claim 1, wherein the thicknesses of said light guide are different on said light source side and said positions for its division.
Claim 16
Dependent Claim
31 words
A surface lighting device according to Claim 15, wherein the thickness of said light guide is thicker on said light source side than the thickness of said position for its division.
Claim 17
Dependent Claim
17 words
A surface lighting device according to Claim 1, wherein said light guide is divided by diagonal lines.
Claim 18
Dependent Claim
22 words
A surface lighting device according to Claim 1, wherein said light guide is configured to be quadrangle for its light emission face.
Claim 19
Dependent Claim
23 words
A surface lighting device according to Claim 18, wherein light sources are arranged respectively for a set of opposing sides of said quadrangle.
Claim 20
Dependent Claim
17 words
A surface lighting device according to Claim 1, wherein said light guide is divided in point symmetry.
Claim 21
Dependent Claim
19 words
A surface lighting device according to Claim 1, wherein said light guide is made of glass or plastic material.
Claim 22
Dependent Claim
15 words
A surface lighting device according to Claim 21, wherein said plastic material is acrylic resin.
Claim 23
Dependent Claim
29 words
A surface lighting device according to Claim 1, wherein said device has a reflection board opposing to a surface opposite to said light emission face of said light guide.
Claim 24
Dependent Claim
25 words
A surface lighting device according to Claim 1, wherein said device has a diffusion board on said light emission face side of said light guide.
Claim 25
Dependent Claim
30 words
A surface lighting device according to Claim 1, wherein a diffusion reflection pattern is provided on the face side opposite to the light emission face side of said light guide.
Claim 26
Dependent Claim
68 words
A surface lighting device according to Claim 25, wherein said diffusion reflection pattern is arranged in such a manner that the arrangement density on said incident light side or in the position farther away from said position where the light guide is divided is higher than the arrangement density on the incident side of light from said light source or the position where said light guide is divided.
Claim 27
Dependent Claim
21 words
A surface lighting device according to Claim 1, wherein said light source is installed by clip shaped members having spring capability.
Claim 28
Dependent Claim
28 words
A surface lighting device according to Claim 27, wherein said clip shaped members are arranged on a reflection board which reflects rays of light from said light source.
Claim 29
Dependent Claim
24 words
A surface lighting device according to Claim 28, wherein said reflection board is further provided with leads for supplying power to said light source.
Claim 30
Dependent Claim
46 words
A surface lighting device according to Claim 23, wherein said reflection board and/or light guide is arranged to set the color of said reflection board and/or light guide against the standard color within a range of -2.0 to 0 at Δb* value in CIE1976L*a*b* chromatic space.
Claim 31
Dependent Claim
90 words
A surface lighting device according to Claim 19, wherein of said light sources, the length of effective emission portions of the light sources is longer than the length of effective emission surface of the surface lighting device on the side where said light sources are arranged for those arranged on the two opposing side ends, and is shorter than the length of the effective emission surface of the surface lighting device on the side where said light sources are arranged for those arranged on the other two opposing side ends.
Claim 32
Dependent Claim
31 words
A surface lighting device according to Claim 31, wherein the configuration of said effective emission surface is rectangular and the lengths of effective emission portions of said light sources are equal.
Claim 33
Dependent Claim
15 words
A display having a surface lighting device according to Claim 1 and a display panel.
Claim 34
Dependent Claim
15 words
A display according to Claim 33, wherein said display panel is a liquid crystal panel.
Claim 35
Dependent Claim
15 words
A display according to Claim 33, wherein said light source is a linear light source.
Claim 36
Dependent Claim
30 words
A display according to Claim 33, wherein said light source is a linear light source, and said light guide is divided at positions in parallel to said linear light source.
Claim 37
Dependent Claim
25 words
A display according to Claim 33, wherein said light guide is divided at positions having equal distances or substantially equal distances from said light source.
Claim 38
Dependent Claim
20 words
A display according to Claim 33, wherein the junction of said light guide is made by adhesives, setting, or welding.
Claim 39
Dependent Claim
13 words
A display according to Claim 38, wherein said welding is an utlrasonic welding.
Claim 40
Dependent Claim
15 words
A display according to Claim 33, wherein said light guide is divided in linear symmetry.
Claim 41
Dependent Claim
35 words
A display according to Claim 33, wherein said light guide is divided at positions in the central or substantially central portion of said light source and parallel or substantially parallel to said two opposing faces.
Claim 42
Dependent Claim
32 words
A display according to Claim 41, wherein said light guide is further divided at positions having an equal distance or substantially equal distance from said positions where the light guide is divided.
Claim 43
Dependent Claim
17 words
A display according to Claim 33, wherein said light guide is divided into at least three portions.
Claim 44
Dependent Claim
32 words
A display according to Claim 43, wherein the junctions between surfaces of said light guide are inclined to the surface to which the rays of light from the light guide are irradiated.
Claim 45
Dependent Claim
26 words
A display according to Claim 44, wherein the angles of said inclination are 245° to 90° to the face opposite to said surface to be irradiated.
Claim 46
Dependent Claim
30 words
A display according to Claim 37, wherein the junctions between surfaces of said light guide are inclined to the face to emit the rays of light from the light guide.
Claim 47
Dependent Claim
25 words
A display according to Claim 46, wherein the angles of said inclination are 245° to 90° to the face opposite to said face of emission.
Claim 48
Dependent Claim
27 words
A display according to Claim 33, wherein the thicknesses of said light guide are different on the said light source side and said position for its division.
Claim 49
Dependent Claim
30 words
A display according to Claim 48, wherein the thickness of said light guide is thicker on the said light source side than the thickness of said position for its division.
Claim 50
Dependent Claim
15 words
A display according to Claim 33, wherein said light guide is divided by diagonal lines.
Claim 51
Dependent Claim
20 words
A display according to Claim 33, wherein said light guide is configured to be quadrangle for its light emission face.
Claim 52
Dependent Claim
21 words
A display according to Claim 51, wherein light sources are arranged respectively for a set of opposing sides of said quadrangle.
Claim 53
Dependent Claim
15 words
A display according to Claim 33, wherein said light guide is divided in point symmetry.
Claim 54
Dependent Claim
17 words
A display according to Claim 33, wherein said light guide is made of glass or plastic material.
Claim 55
Dependent Claim
13 words
A display according to Claim 54, wherein said plastic material is acrylic resin.
Claim 56
Dependent Claim
29 words
A display according to Claim 33, wherein said surface lighting device has a reflection board opposing to a surface opposite to said light emission face of said light guide.
Claim 57
Dependent Claim
25 words
A display according to Claim 33, wherein said surface lighting device has a diffusion board on said light emission face side of said light guide.
Claim 58
Dependent Claim
28 words
A display according to Claim 33, wherein a diffusion reflection pattern is provided on the face side opposite to the light emission face side of said light guide.
Claim 59
Dependent Claim
66 words
A display according to Claim 58, wherein said diffusion reflection pattern is arranged in such a manner that the arrangement density on said incident light side or in the position farther away from said position where the light guide is divided is higher than the arrangement density on the incident side of light from said light source or the position where said light guide is divided.
Claim 60
Dependent Claim
19 words
A display according to Claim 33, wherein said light source is installed by clip shaped members having spring capability.
Claim 61
Dependent Claim
26 words
A display according to Claim 60, wherein said clip shaped members are arranged on a reflection board which reflects rays of light from said light source.
Claim 62
Dependent Claim
22 words
A display according to Claim 61, wherein said reflection board is further provided with leads for supplying power to said light source.
Claim 63
Dependent Claim
44 words
A display according to Claim 56, wherein said reflection board and/or light guide is arranged to set the color of said reflection board and/or light guide against the standard color within a range of -2.0 to 0 at Δb* value in CIE1976L*a*b* chromatic space.
Claim 64
Dependent Claim
88 words
A display according to Claim 52, wherein of said light sources, the length of effective emission portions of the light sources is longer than the length of effective emission surface of the surface lighting device on the side where said light sources are arranged for those arranged on the two opposing side ends, and is shorter than the length of the effective emission surface of the surface lighting device on the side where said light sources are arranged for those arranged on the other two opposing side ends.
Claim 65
Dependent Claim
29 words
A display according to Claim 64, wherein the configuration of said effective emission surface is rectangular and the lengths of effective emission portions of said light sources are equal.
References Cited (Backward Citations)
No citation records indexed.
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