Surface lighting device and a display having such a lighting device
First Claim
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1. A surface lighting device provided with a light source and a reflection board to reflect rays of light emitted from the light source forward, whereinthe color of said reflection board is set against a standard color within a range of -2.0 to 0 at Δ
- b* value in CIE1976L*a*b*, whereinL* denotes psychometric lightness,a* denotes psychometric perceived chromaticity in the red-green region,b* denotes psychometric perceived chromaticity in the blue-yellow region of CIE1976, a uniform color space defined using a three-dimensional rectangular coordinate system adopted at the Commission Internationale de l'"'"'Eclainage, andΔ
b* denotes a difference between b* of a reference color and b* of a measured color of said reflection board, wherein a value of Δ
b* of the measured color of the reflection board is not smaller by -2 than a reference color, and smaller by 0 than the reference color at an initial state, and when the reflection board is continuously illuminated for 10,000 hours, the Δ
b* value of the color of the reflection board is smaller than 2, andthe reference color is a color directly above the light source.
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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.
79 Citations
12 Claims
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1. A surface lighting device provided with a light source and a reflection board to reflect rays of light emitted from the light source forward, wherein
the color of said reflection board is set against a standard color within a range of -2.0 to 0 at Δ - b* value in CIE1976L*a*b*, wherein
L* denotes psychometric lightness, a* denotes psychometric perceived chromaticity in the red-green region, b* denotes psychometric perceived chromaticity in the blue-yellow region of CIE1976, a uniform color space defined using a three-dimensional rectangular coordinate system adopted at the Commission Internationale de l'"'"'Eclainage, and Δ
b* denotes a difference between b* of a reference color and b* of a measured color of said reflection board, wherein a value of Δ
b* of the measured color of the reflection board is not smaller by -2 than a reference color, and smaller by 0 than the reference color at an initial state, and when the reflection board is continuously illuminated for 10,000 hours, the Δ
b* value of the color of the reflection board is smaller than 2, andthe reference color is a color directly above the light source. - View Dependent Claims (2, 3, 4, 5, 12)
- b* value in CIE1976L*a*b*, wherein
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6. A display having a surface lighting means provided with a light source having power supply leads, and a reflection board to which said light source is fixed, and a display panel to which rays of light from said means are irradiated, wherein
the color of said reflection board is set against a standard color within a range of -2.0 to 0 at Δ - b* value in CIE1976L*a*b*,
wherein L* denotes psychometric lightness, a* denotes psychometric perceived chromaticity in the red-green region, b* denotes psychometric perceived chromaticity in the blue-yellow region of CIE1976, a uniform color space defined using a three-dimensional rectangular coordinate system adopted at the Commission Internationale de l'"'"'Eclainage, and Δ
b* denotes a difference between b* of a reference color and b* of a measured color of said reflection board, wherein a value of Δ
b* of the measured color of the reflection board is not smaller by -2 than a reference color, and smaller by 0 than the reference color at an initial state, and when the reflection board is continuously illuminated for 10,000 hours, the Δ
b* value of the color of the reflection board is smaller than 2, andthe reference color is a color directly above the light source. - View Dependent Claims (7, 8, 9, 10, 11)
- b* value in CIE1976L*a*b*,
Specification
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Current AssigneeCanon Kabushiki Kaisha (Canon Inc.)
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Original AssigneeCanon Kabushiki Kaisha (Canon Inc.)
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InventorsMori, Hideo, Yamamoto, Takashi, Takabayashi, Hiroshi, Kanda, Toshiyuki, Tajima, Hisao
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Primary Examiner(s)Dority, Carroll B.
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Application NumberUS08/373,096Time in Patent Office966 DaysField of Search362/31, 362/26, 362/27, 362/33, 362/97, 248/316.7, 248/74.2, 385/15, 385/31, 385/95, 385/96, 385/98, 385/901, 359/49, 359/599US Class Current362/97.1CPC Class CodesG02B 6/0026 Wavelength selective elemen...G02B 6/0046 Tapered light guide, e.g. w...G02B 6/0051 Diffusing sheet or layerG02B 6/0055 Reflecting element, sheet o...G02B 6/0061 to provide homogeneous ligh...G02B 6/0068 Arrangements of plural sour...G02B 6/0071 with elongated shape, e.g. ...G02B 6/009 of the light source in the ...G09F 13/0409 Arrangements for homogeneou...G09F 13/0454 Slidable panels or partsG09F 2013/1827 Prismatic windowG09F 2013/1831 using more than one light s...Y10S 385/901 Illuminating or display app...
