JPH06348213A - Edge light type plane light - Google Patents
Edge light type plane lightInfo
- Publication number
- JPH06348213A JPH06348213A JP5133647A JP13364793A JPH06348213A JP H06348213 A JPH06348213 A JP H06348213A JP 5133647 A JP5133647 A JP 5133647A JP 13364793 A JP13364793 A JP 13364793A JP H06348213 A JPH06348213 A JP H06348213A
- Authority
- JP
- Japan
- Prior art keywords
- light
- cold cathode
- plate
- light transmission
- guide plate
- 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.)
- Pending
Links
- 229920000178 Acrylic resin Polymers 0.000 abstract description 6
- 239000004925 Acrylic resin Substances 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract 10
- 238000009792 diffusion process Methods 0.000 description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 5
- 229920000515 polycarbonate Polymers 0.000 description 4
- 239000004417 polycarbonate Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000012463 white pigment Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Illuminated Signs And Luminous Advertising (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】パソコン等の液晶用バックライト
等に使用されている、冷陰極管を用いた導光板（エッジ
ライト）式平面ライトに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light guide plate (edge light) type flat light using a cold cathode tube, which is used for a liquid crystal backlight for personal computers and the like.
【０００２】[0002]
【従来の技術・発明が解決しようとする課題】液晶ディ
スプレイは急速に発展してきているが、液晶自身は発光
しないため、その画像を見るためにバックライトが必要
である。特にカラー液晶では表示品位に与える影響も大
きいため、バックライトに要求される性能は多岐にわた
っている。この液晶用バックライトは、エッジ式と直下
式とに大別されているが、エッジ式（エッジライト式平
面ライト）は、薄形で高輝度、高効率であることから、
平面光源として多用されている。2. Description of the Related Art Liquid crystal displays have been developing rapidly, but liquid crystals themselves do not emit light, so that a backlight is required to see the image. In particular, color liquid crystals have a great influence on the display quality, so that the performance required for the backlight is wide-ranging. This LCD backlight is roughly classified into an edge type and a direct type, but the edge type (edge light type flat light) is thin, has high brightness, and has high efficiency.
Widely used as a flat light source.
【０００３】エッジライト式平面ライトは、一般的には
図３に示すような構造（断面図）となっており、拡散処
理された導光板（発光面）２の側端面に冷陰極管１を配
置し、冷陰極管１の光を導光板２の側端面より内部に導
入し、導光板２の発光面全体を均一に光らせて面光源に
している。このように冷陰極管は、図４に示すａまたは
ｂの長さが必要となる。薄形の平面光源において用いら
れている管径３ｍｍ程度の冷陰極管は、反り、強度等の
点から、現行のレベルでは最長でも３００ｍｍ程度であ
る。The edge light type flat light generally has a structure (cross-sectional view) as shown in FIG. 3, and the cold cathode tube 1 is provided on the side end surface of the light guide plate (light emitting surface) 2 which has been subjected to the diffusion treatment. The light from the cold cathode fluorescent lamp 1 is introduced into the inside from the side end surface of the light guide plate 2, and the entire light emitting surface of the light guide plate 2 is uniformly illuminated to form a surface light source. As described above, the cold cathode tube needs to have the length a or b shown in FIG. The cold cathode tube with a tube diameter of about 3 mm used in a thin flat light source has a length of about 300 mm at the current level at the current level in terms of warpage and strength.
【０００４】このため、例えばＡ２サイズ(600×400mm)
程度の大型のエッジライト式平面ライトにおいては、従
来、管径の大きな冷陰極管を使用したり、または適当な
長さの冷陰極管をその長手方向に直線状に継ぎ合わせて
使用している。しかし、使用する冷陰極管の径を大きく
するに従い、導光板の厚さは増加し、薄形の特徴が損な
われる結果となる。また、図５のように冷陰極管を直線
状に継ぎ合わせると、冷陰極管１の両端は電極で非発光
部分７となり、継ぎ合わせの部分が発光しないため、エ
ッジライト式平面ライトの発光部分に暗部８が生じると
いう問題点がある。Therefore, for example, A2 size (600 x 400 mm)
In the case of a large-sized edge light type flat light, conventionally, a cold cathode tube with a large tube diameter has been used, or a cold cathode tube of an appropriate length is spliced in a straight line in its longitudinal direction. . However, as the diameter of the cold-cathode tube used increases, the thickness of the light guide plate increases, resulting in the loss of the thin-type characteristics. Further, when the cold cathode tubes are joined in a straight line as shown in FIG. 5, both ends of the cold cathode tube 1 become non-light emitting portions 7 by electrodes, and the joined portions do not emit light. There is a problem that the dark portion 8 is generated.
【０００５】本発明の目的は、大型（Ａ２サイズ以上）
等のエッジライト式平面ライトにおいても、薄形の形状
を保ち、かつその発光部分に暗部が生じないエッジライ
ト式平面ライトを提供することである。The object of the present invention is a large size (A2 size or more)
It is an object of the present invention to provide an edge light type flat light that maintains a thin shape and does not have a dark portion in its light emitting portion even in the edge light type flat light.
【０００６】[0006]
【課題を解決するための手段】エッジライト式平面ライ
トにおいて、従来、冷陰極管は直線状に取りつけられる
ことが常識と考えられていたが、本発明者は、２以上の
冷陰極管がその長手方向に継ぎ合わされ、かつそれぞれ
の冷陰極管のなす角が１８０°未満になるように取りつ
けられることにより、上記目的が達成されることを見出
した。In the edge light type flat light, it has been conventionally considered that cold cathode tubes are linearly mounted, but the present inventor has adopted two or more cold cathode tubes. It has been found that the above object can be achieved by joining the cold cathode tubes so that the angle formed by each cold cathode tube is less than 180 °.
【０００７】即ち、本発明は、２以上の冷陰極管がその
長手方向に継ぎ合わされ、かつそれぞれの冷陰極管のな
す角が１８０°未満であることを特徴とするエッジライ
ト式平面ライトである。That is, the present invention is an edge light type flat light, characterized in that two or more cold cathode fluorescent lamps are joined together in the longitudinal direction thereof, and the angle formed by each cold cathode fluorescent lamp is less than 180 °. .
【０００８】[0008]
【作用】本発明におけるエッジライト式平面ライトと
は、導光板の側端部より冷陰極管の光を導入し、反射
板、拡散板等を用いて導光板発光面側を光らせ、均一な
面光源とするものである。The edge light type flat light in the present invention means that the light of the cold cathode tube is introduced from the side end portion of the light guide plate and the light emitting surface side of the light guide plate is illuminated by using a reflecting plate, a diffusing plate or the like to obtain a uniform surface It is used as a light source.
【０００９】光を導入する導光板の材料としては、光線
透過率の高いポリメタクリル酸メチル、メタクリル−ス
チレン共重合体等のアクリル系ポリマー、ポリカーボネ
ート等が用いられる。導光板の厚さは通常２〜１０ｍ
ｍ、好ましくは３〜５ｍｍである。As the material of the light guide plate for introducing light, acrylic polymers such as polymethylmethacrylate and methacryl-styrene copolymer having high light transmittance, and polycarbonate are used. The thickness of the light guide plate is usually 2 to 10 m
m, preferably 3-5 mm.
【００１０】光源ランプとしての冷陰極管とは、グロー
放電を利用した放電灯であり、陽光柱で発生した紫外線
を蛍光体で可視光線に変換する系を利用したものであ
る。冷陰極管は、電極に板状または円筒状の金属や焼結
金属を用いており、フィラメントを用いないため、電極
部の構造を簡素かつ小型にでき、管径を小さくすること
が可能である。また、電極の寿命はランプ寿命（10,000
〜20,000時間）に比べて大変長く、実際上ランプ寿命は
輝度の低下のみで規定される。冷陰極管の管径は通常
２．５〜７ｍｍ、好ましくは３〜５ｍｍであり、長さは
通常５０〜３００ｍｍ、好ましくは７０〜２５０ｍｍで
ある。The cold-cathode tube as a light source lamp is a discharge lamp using glow discharge, and uses a system in which ultraviolet rays generated in a positive column are converted into visible rays by a phosphor. Since the cold cathode tube uses a plate-shaped or cylindrical metal or sintered metal for the electrode and does not use a filament, the structure of the electrode part can be simplified and downsized, and the tube diameter can be reduced. . The life of the electrode is the lamp life (10,000
It is much longer than the (about 20,000 hours), and the lamp life is practically defined only by the decrease in brightness. The tube diameter of the cold cathode tube is usually 2.5 to 7 mm, preferably 3 to 5 mm, and the length is usually 50 to 300 mm, preferably 70 to 250 mm.
【００１１】反射板としては、白色顔料を混ぜること等
により拡散効率、反射効率を向上させたポリエチレンテ
レフタレート（ＰＥＴ）フィルム、ポリエステルフィル
ム等が用いられる。また、光源まわりの反射板には、銀
を蒸着したＰＥＴフィルム等も用いられる。As the reflection plate, a polyethylene terephthalate (PET) film, a polyester film or the like, which is improved in diffusion efficiency and reflection efficiency by mixing a white pigment or the like, is used. Further, a PET film or the like in which silver is deposited is also used for the reflector around the light source.
【００１２】エッジライト式平面ライトの面光源（液晶
側）には、印刷パターンから乱反射した光線が導光板を
通過し、導光板から出射した光線をさらに拡散させ、均
一にするために拡散板が設けられる。この拡散板として
は、安価で品質、光学特性の良いＰＥＴやポリカーボネ
ート等の表面に光拡散物質を塗布したもの、またはその
表面にエンボス加工あるいはフレネルレンズ加工を施し
たもの等が用いられる。The surface light source (on the liquid crystal side) of the edge light type flat light is provided with a diffuser plate in order to diffuse the light rays diffusely reflected from the printed pattern through the light guide plate and further diffuse the light rays emitted from the light guide plate. It is provided. As the diffusing plate, a material such as PET or polycarbonate which is inexpensive and has good optical characteristics and whose surface is coated with a light diffusing substance, or a surface of which is embossed or Fresnel lens processed is used.
【００１３】乱反射層とは、導光板の端部より入射した
光を進行方向に対して直角方向（発光面側）に送るため
に、導光板発光面の反対側の面に白色拡散剤の塗布また
は表面平滑性の破壊処理等を施した層のことである。The diffused reflection layer is a white diffuser applied to the surface opposite to the light emitting surface of the light guide plate in order to send light incident from the end of the light guide plate in a direction (light emitting surface side) perpendicular to the traveling direction. Alternatively, it is a layer that has been subjected to a surface smoothness breaking treatment or the like.
【００１４】本発明において、冷陰極管どうしのなす角
である角度αは１８０°未満であることが必要である。
この条件により、従来、冷陰極管を直線状に継ぎ合わせ
た場合に生じていた暗部を解消することができる。角度
αは好ましくは１５０〜１７５°、より好ましくは１６
０〜１７０°であるが、基本的に導光板２１は発光面の
形状の調整（一般に発光面は長方形）や、導光板の継ぎ
目部分の被覆のために非発光部とするので、製品との兼
ね合いが必要である。また、冷陰極管を３本以上継ぎ合
わせる場合、それぞれの角度αは同一でも異なっていて
もよい。In the present invention, the angle α, which is the angle formed between the cold cathode tubes, must be less than 180 °.
By this condition, it is possible to eliminate the dark portion which has been conventionally generated when the cold cathode tubes are joined in a straight line. The angle α is preferably 150-175 °, more preferably 16
Although it is 0 to 170 °, basically the light guide plate 21 is a non-light emitting part for adjusting the shape of the light emitting surface (generally, the light emitting surface is rectangular) and covering the joint portion of the light guide plate, so A tradeoff is needed. When three or more cold cathode tubes are joined together, the respective angles α may be the same or different.
【００１５】導光板（非発光部）２１の長さｃ（図１，
２に示す）も、製品との兼ね合いから、好ましくは５〜
３０ｍｍ、より好ましくは５〜１０ｍｍである。The length c of the light guide plate (non-light emitting portion) 21 (see FIG. 1,
2) is also preferably 5 to 5 in consideration of the product.
It is 30 mm, more preferably 5 to 10 mm.
【００１６】[0016]
【実施例】以下に実施例を挙げて本発明をより詳しく説
明するが、本発明はこれらに限定されるものではない。The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto.
【００１７】実施例１ 図１は、本発明のエッジライト式平面ライトの一実施例
の平面図を示したものである。これは、導光板（非発光
部）２１の一方側に、角度αが１６５°になるように２
本の冷陰極管１をその長手方向に継ぎ合わせて取りつ
け、また、導光板（非発光部）２１の他方側に導光板
（発光面）２を取りつけたものである。ここで、導光板
（非発光部）２１としてアクリル樹脂板（表面クリア
ー）を、導光板（発光面）２としてアクリル樹脂板（表
面マット加工）を用い、導光板２１と導光板２は反射板
（１枚）上の所定の位置に貼り付けることにより接合さ
せた。２本の冷陰極管１の管径はそれぞれ３ｍｍ、長さ
はそれぞれ３００ｍｍであり、これら冷陰極管１を角度
αが１６５°になるように、かつ導光板２１の一方側に
接するようにして上記反射板で覆い、この反射板の端部
を導光板２１（の上面）に貼り付けて、冷陰極管１を導
光板２１に取りつけた。また、反射板として白色顔料を
分散させたポリエステルシートを、拡散板として光拡散
物質を塗布したポリカーボネートシートを用いた。この
ようにして得られた本エッジライト式平面ライトの大き
さは４３０ｍｍ×６００ｍｍ×３ｍｍ（発光面の大きさ
は３８０ｍｍ×５５０ｍｍ）である。Embodiment 1 FIG. 1 is a plan view showing an embodiment of the edge light type flat light according to the present invention. This is done so that the angle α is 165 ° on one side of the light guide plate (non-light emitting portion) 21.
The cold-cathode tube 1 of this book is attached by joining it in the longitudinal direction, and the light guide plate (light emitting surface) 2 is attached to the other side of the light guide plate (non-light emitting portion) 21. Here, an acrylic resin plate (surface clear) is used as the light guide plate (non-light emitting portion) 21, and an acrylic resin plate (surface matte processing) is used as the light guide plate (light emitting surface) 2. The light guide plate 21 and the light guide plate 2 are reflection plates. The pieces were joined by sticking them to a predetermined position on (one sheet). The two cold-cathode tubes 1 each have a diameter of 3 mm and a length of 300 mm. The cold-cathode tubes 1 are arranged so that the angle α is 165 ° and they are in contact with one side of the light guide plate 21. The cold cathode tube 1 was attached to the light guide plate 21 by covering it with the above-mentioned reflection plate and adhering an end portion of this reflection plate to (the upper surface of) the light guide plate 21. Further, a polyester sheet having a white pigment dispersed therein was used as the reflection plate, and a polycarbonate sheet coated with a light diffusing substance was used as the diffusion plate. The size of the edge light type planar light thus obtained is 430 mm × 600 mm × 3 mm (the size of the light emitting surface is 380 mm × 550 mm).
【００１８】実施例２ 図２は、本発明のエッジライト式平面ライトの他の実施
例の平面図を示したものである。ここでは冷陰極管１を
３本使用しているが、それぞれの冷陰極管のなす角（角
度α）が１７５°になるように、冷陰極管１を導光板
（非発光部）２１の一方側に取りつけ、また、導光板
（非発光部）２１の他方側に導光板（発光面）２を取り
つけた。導光板（非発光部）２１としてアクリル樹脂板
（クリアー）を、導光板（発光面）２としてアクリル樹
脂板（クリアー）を用い、導光板２１と導光板２は反射
板上の所定の位置に貼り付けることにより接合させた。
３本の冷陰極管１の管径はそれぞれ３ｍｍ、長さはそれ
ぞれ３００ｍｍであり、これら冷陰極管１を角度αが１
７５°になるようにして、紫外線硬化樹脂を用いて導光
板２１に取りつけた。また、反射板として白色顔料を分
散させたポリエステルシートを、拡散板として光拡散物
質を塗布したポリカーボネートシートを用いた。このよ
うにして得られた本エッジライト式平面ライトの大きさ
は９００ｍｍ×５００ｍｍ×３ｍｍ（発光面の大きさは
８５０ｍｍ×４５０ｍｍ）である。Embodiment 2 FIG. 2 is a plan view showing another embodiment of the edge light type flat light according to the present invention. Here, although three cold cathode tubes 1 are used, one of the light guide plates (non-light emitting portion) 21 is connected to the cold cathode tubes 1 so that the angle (angle α) formed by each cold cathode tube is 175 °. The light guide plate (light emitting surface) 2 was attached to the other side of the light guide plate (non-light emitting portion) 21. An acrylic resin plate (clear) is used as the light guide plate (non-light emitting portion) 21, and an acrylic resin plate (clear) is used as the light guide plate (light emitting surface) 2. The light guide plate 21 and the light guide plate 2 are placed at predetermined positions on the reflection plate. It was joined by pasting.
Each of the three cold cathode tubes 1 has a diameter of 3 mm and a length of 300 mm.
The light guide plate 21 was mounted at an angle of 75 ° using an ultraviolet curable resin. Further, a polyester sheet having a white pigment dispersed therein was used as the reflection plate, and a polycarbonate sheet coated with a light diffusing substance was used as the diffusion plate. The size of the edge light type planar light thus obtained is 900 mm × 500 mm × 3 mm (the size of the light emitting surface is 850 mm × 450 mm).
【００１９】実施例１および実施例２における導光板２
と導光板２１との接続工程を省略するために、一枚の導
光板２の一部（上記の導光板２１に対応する部分）に、
切削、研磨等の加工を施して、導光板２１としてもよ
い。しかし、前者の方法（導光板２と導光板２１とを接
続させる方法）により作製する方が、導光板接合面での
乱反射、導光板２と導光板２１との材質の違い等による
光拡散効果等が期待でき、冷陰極管の継ぎ目部分の暗部
解消にはより有利である。Light guide plate 2 in Examples 1 and 2
In order to omit the connecting step between the light guide plate 21 and the light guide plate 21, a part of one light guide plate 2 (a part corresponding to the above light guide plate 21)
The light guide plate 21 may be subjected to processing such as cutting and polishing. However, if the former method (method of connecting the light guide plate 2 and the light guide plate 21) is used, diffused reflection at the joint surface of the light guide plate, light diffusion effect due to difference in material between the light guide plate 2 and the light guide plate 21, etc. Etc. can be expected, which is more advantageous for eliminating the dark portion of the joint portion of the cold cathode tube.
【００２０】上記実施例１および実施例２で得られたエ
ッジライト式平面ライトにおいて、冷陰極管を点灯させ
ると、その平面ライトの発光面に暗部は見られず、均一
な面光源となった。In the edge light type flat light obtained in the above-mentioned Examples 1 and 2, when the cold cathode tube was turned on, no dark portion was observed on the light emitting surface of the flat light, and a uniform surface light source was obtained. .
【００２１】[0021]
【発明の効果】本発明のエッジライト式平面ライトは、
２以上の冷陰極管をその長手方向に継ぎ合わせ、かつそ
れぞれの冷陰極管のなす角を１８０°未満としたもので
あるから、管径の小さな冷陰極管を２以上継ぎ合わせて
大型にしても、上記角度により発光部分に暗部が生じる
ことがない。よって、本発明においては、薄形かつ大型
で、しかも発光部分に暗部のないエッジライト式平面ラ
イトを提供できるという効果を有する。The edge light type flat light of the present invention is
Since two or more cold cathode tubes are spliced in the longitudinal direction and the angle formed by each cold cathode tube is less than 180 °, two or more cold cathode tubes with small diameter are spliced into a large size. However, due to the above angle, a dark portion does not occur in the light emitting portion. Therefore, the present invention has an effect that it is possible to provide a thin and large-sized edge light type flat light having no dark portion in the light emitting portion.
【図１】本発明のエッジライト式平面ライトの一実施例
を示す平面図である。FIG. 1 is a plan view showing an embodiment of an edge light type flat light according to the present invention.
【図２】本発明のエッジライト式平面ライトの他の実施
例を示す平面図である。FIG. 2 is a plan view showing another embodiment of the edge light type flat light of the present invention.
【図３】エッジライト式平面ライトの断面図である。FIG. 3 is a cross-sectional view of an edge light type flat light.
【図４】エッジライト式平面ライトの導光板の平面図で
ある。FIG. 4 is a plan view of a light guide plate of an edge light type flat light.
【図５】エッジライト式平面ライトにおける暗部を示す
平面図である。FIG. 5 is a plan view showing a dark portion in an edge light type flat light.
１ 冷陰極管 ２ 導光板（発光面） ２１ 導光板（非発光部） ３ 反射板 ４ 拡散板 ５ 乱反射層 ６ 継ぎ目 ７ 非発光部分 ８ 暗部 DESCRIPTION OF SYMBOLS 1 Cold cathode tube 2 Light guide plate (light emitting surface) 21 Light guide plate (non-light emitting part) 3 Reflector 4 Diffuser 5 Diffuse reflection layer 6 Seam 7 Non light emitting part 8 Dark part
Claims (1)
合わされ、かつそれぞれの冷陰極管のなす角が１８０°
未満であることを特徴とするエッジライト式平面ライ
ト。1. Two or more cold cathode fluorescent lamps are joined together in the longitudinal direction, and the angle formed by each cold cathode fluorescent lamp is 180 °.
Edge light type flat light characterized by being less than.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5133647A JPH06348213A (en) | 1993-06-03 | 1993-06-03 | Edge light type plane light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5133647A JPH06348213A (en) | 1993-06-03 | 1993-06-03 | Edge light type plane light |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06348213A true JPH06348213A (en) | 1994-12-22 |
Family
ID=15109697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5133647A Pending JPH06348213A (en) | 1993-06-03 | 1993-06-03 | Edge light type plane light |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06348213A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004093111A1 (en) * | 2003-04-18 | 2004-10-28 | Matsushita Electric Industrial Co., Ltd. | Lighting device for operating part |
| JP2011054337A (en) * | 2009-08-31 | 2011-03-17 | Sharp Corp | Light emitting module, and method of manufacturing the same |
-
1993
- 1993-06-03 JP JP5133647A patent/JPH06348213A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004093111A1 (en) * | 2003-04-18 | 2004-10-28 | Matsushita Electric Industrial Co., Ltd. | Lighting device for operating part |
| US7399098B2 (en) | 2003-04-18 | 2008-07-15 | Matsushita Electric Industrial Co., Ltd. | Illuminating apparatus for operating section |
| JP2011054337A (en) * | 2009-08-31 | 2011-03-17 | Sharp Corp | Light emitting module, and method of manufacturing the same |
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