【０００１】[0001]
【発明の属する技術分野】この発明は導光板を備えた照
明装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device equipped with a light guide plate.
【０００２】[0002]
【従来の技術】例えば液晶表示装置には、液晶表示パネ
ル自体が自己発光能力を有していないため、液晶表示パ
ネルの裏面側にバックライトとして照明装置を配置した
ものがある。図４は従来のこのような照明装置の一例の
平面図を示したものである。2. Description of the Related Art For example, some liquid crystal display devices have an illuminating device as a backlight on the back side of the liquid crystal display panel because the liquid crystal display panel itself does not have a self-luminous ability. FIG. 4 is a plan view of an example of such a conventional lighting device.
【０００３】この照明装置は導光板１を備えている。導
光板１は、一様な厚さの平板状をなし、所定の一端面を
光の入射面２とされ、図示しない液晶表示パネルと対向
させる表面を出射面３とされ、導光板１の出射面３とは
反対側の裏面、入射面２とは反対側の端面（以下、反入
射面という）および残りの２つの側端面にはそれぞれ反
射シート４〜７が貼り付けられた構造となっている。導
光板１の入射面２と対向する位置には線状の冷陰極管８
が配置されている。This illuminating device has a light guide plate 1. The light guide plate 1 is in the form of a flat plate having a uniform thickness, one end surface of which is a light incident surface 2, and a surface which faces a liquid crystal display panel (not shown) is an emission surface 3. Reflection sheets 4 to 7 are attached to the back surface on the side opposite to the surface 3, the end surface on the side opposite to the incident surface 2 (hereinafter referred to as the anti-incident surface), and the remaining two side end surfaces, respectively. There is. A linear cold cathode tube 8 is provided at a position facing the incident surface 2 of the light guide plate 1.
Are arranged.
【０００４】冷陰極管８から出射され導光板１の入射面
２に入射された光は、導光板１内を出射面３とその裏面
とで反射を繰り返すと共に反射シート４〜７に反射され
つつ入射面２側からその反対側に向かって進行し（導光
され）、その間に導光板１の出射面３から適量づつ出射
される。The light emitted from the cold cathode tube 8 and incident on the incident surface 2 of the light guide plate 1 is repeatedly reflected in the light guide plate 1 by the emission surface 3 and the back surface thereof, and is reflected by the reflection sheets 4 to 7. The light travels from the incident surface 2 side to the opposite side (light is guided), and in the meanwhile, an appropriate amount of light is emitted from the emission surface 3 of the light guide plate 1.
【０００５】ところで、上記従来の照明装置では、導光
板１の出射面３全体から光を均一に出射させ、液晶表示
パネルの表面から発せられる光の輝度分布を均一化でき
るように、導光板１の裏面に、調光パターンが設けられ
ている。By the way, in the above conventional illumination device, light is uniformly emitted from the entire emission surface 3 of the light guide plate 1 so that the luminance distribution of the light emitted from the surface of the liquid crystal display panel can be made uniform. A dimming pattern is provided on the back surface of the.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記従
来の照明装置では、導光板１の反入射面に貼り付けられ
た反射シート５で反射されて出射面３から発せられる光
量が、導光板１の裏面に設けられた調光パターンである
程度制御することはできるが、それでも、他の２つの側
端面に貼り付けられた反射シート６、７で反射されて出
射面３から発せられる光量よりも多くなってしまうとい
う問題があった。However, in the above-mentioned conventional lighting device, the amount of light reflected from the reflection sheet 5 attached to the anti-incidence surface of the light guide plate 1 and emitted from the emission surface 3 is equal to that of the light guide plate 1. Although it can be controlled to some extent by the dimming pattern provided on the back surface, the amount of light is still larger than that emitted from the emission surface 3 after being reflected by the reflection sheets 6 and 7 attached to the other two side end surfaces. There was a problem that it ended up.
【０００７】この結果、図４において一点鎖線で示すよ
うに、導光板１の出射面３の中央部の領域Ｐ、その周囲
の領域Ｑ、その周囲で反射シート５（反入射面）側の領
域Ｒ、同周囲で反射シート５側を除く領域Ｓの各領域で
の出射光の輝度がＰ＞Ｒ＞Ｑ＞Ｓの順で小さくなる。即
ち、反射シート５近傍の反入射側領域Ｒが局部的に明る
くなる輝度ムラが発生し、この輝度ムラは、液晶表示パ
ネルのバックライトとして用いた場合に表示品質を著し
く低下させてしまう。この反入射側領域Ｒが局部的に明
るくなる輝度ムラは、導光板が反入射面に向かうに従っ
て厚さが漸次薄くなる楔型のものである場合により顕著
に発生する。また、上記輝度ムラは、導光板１の両側端
面に特に反射シート６、７や光反射塗膜等の光反射層を
設けず、反入射面に反射シート５等の光反射層を設けた
場合にも、発生する。As a result, as shown by the alternate long and short dash line in FIG. 4, the area P at the center of the exit surface 3 of the light guide plate 1, the area Q around it, and the area around the reflection sheet 5 (anti-incident surface) side. The luminance of the emitted light in each region of R and the region S around the same except for the reflection sheet 5 side decreases in the order of P>R>Q> S. That is, uneven brightness in which the non-incident side region R near the reflection sheet 5 is locally brightened occurs, and this uneven brightness significantly deteriorates the display quality when used as a backlight of a liquid crystal display panel. The uneven brightness in which the counter-incident side region R is locally brighter is more remarkable in the case where the light guide plate is of a wedge type in which the thickness gradually decreases toward the counter-incident surface. Further, the uneven brightness is caused when the light reflection layers such as the reflection sheets 6 and 7 and the light reflection coating film are not provided on both end surfaces of the light guide plate 1 and the light reflection layers such as the reflection sheet 5 are provided on the anti-incident surface. Also happens.
【０００８】この発明の課題は、導光板を介してその出
射面から面状に光を出射させる照明装置であって、その
出射面の周辺部における光の輝度分布が均一な照明装置
を提供することである。An object of the present invention is to provide a lighting device which planarly emits light from its emission surface via a light guide plate, and provides an illumination device having a uniform luminance distribution of light in the peripheral portion of the emission surface. That is.
【０００９】[0009]
【課題を解決するための手段】この発明は、請求項１に
記載のように、所定の端面を光が入射する入射面とさ
れ、該入射面に直角な一表面を前記入射面から入射した
光を出射させる出射面とされた導光板と、該導光板の入
射面に対向して配置された光源とを備え、前記導光板の
入射面と対向する反対側の端面に光吸収能を有する光吸
収層を設けたことを特徴とするものである。そして、こ
の発明によれば、導光板の入射面とは反対側の端面に光
吸収層を塗布して形成しているので、反入射面に入射し
た光の大部分を効率良く吸収し、光吸収層近傍の出射面
から出射される光量を抑制することができ、これにより
導光板の出射面の周辺部の輝度分布を均一化することが
できる。この場合、請求項２に記載のように、前記光吸
収層は黒色インクを塗布して形成した光吸収塗膜である
ことが好ましい。また、請求項３に記載のように、平面
形状が矩形をなす導光板の場合には、前記入射面及び該
入射面とは反対側の端面を除いた残りの端面に光反射層
が設けられていることが好ましく、これにより、光吸収
層により入射面とは反対側の端面に入射した光を吸収す
ると共に、残りの端面に入射する光を外部に逸散させる
ことなく反射して照明に有効利用でき、周辺部の輝度分
布が均一化されると共に光を有効利用して全体的に明る
い面状の照明光を得ることができる。さらに、請求項４
に記載のように、前記導光板は、入射面側からその反対
側の端面側に向かうに従って厚さが漸次薄くなる楔型で
あってもよい。According to the present invention, as described in claim 1, a predetermined end face is an incident surface on which light is incident, and one surface perpendicular to the incident surface is incident from the incident surface. A light guide plate serving as an emission surface for emitting light and a light source arranged so as to face the incident surface of the light guide plate are provided, and the end face on the opposite side facing the incident surface of the light guide plate has a light absorbing ability. It is characterized in that a light absorbing layer is provided. Further, according to the present invention, since the light absorbing layer is formed by coating the end surface on the side opposite to the incident surface of the light guide plate, most of the light incident on the anti-incident surface is efficiently absorbed, The amount of light emitted from the emission surface near the absorption layer can be suppressed, and thus the luminance distribution in the peripheral portion of the emission surface of the light guide plate can be made uniform. In this case, as described in claim 2, it is preferable that the light absorbing layer is a light absorbing coating film formed by applying black ink. Further, as described in claim 3, in the case of the light guide plate having a rectangular planar shape, the light reflection layer is provided on the remaining end faces excluding the incident face and the end face opposite to the incident face. It is preferable that the light absorption layer absorbs the light incident on the end surface on the side opposite to the incident surface and reflects the light incident on the remaining end surface without radiating to the outside for illumination. The light can be effectively used, and the luminance distribution in the peripheral portion is made uniform, and the light can be effectively used to obtain illumination light having a bright surface as a whole. Further, claim 4
As described in (1), the light guide plate may be a wedge type in which the thickness gradually decreases from the incident surface side toward the opposite end surface side.
【００１０】[0010]
【発明の実施の形態】図１はこの発明の一実施形態とし
ての照明装置の平面図を示し、図２はそのＸ−Ｘ線に沿
う断面図を示したものである。この照明装置は導光板１
１を備えている。導光板１１は、一様な厚さの平板状を
なし、所定の一端面を入射面１２とされ、図示しない液
晶表示パネルと対向させる表面を出射面１３とされた構
造となっている。1 is a plan view of an illuminating device as an embodiment of the present invention, and FIG. 2 is a sectional view taken along line XX thereof. This lighting device has a light guide plate 1
1 is provided. The light guide plate 11 is in the form of a flat plate having a uniform thickness, and has a structure in which a predetermined one end surface is an entrance surface 12 and a surface facing a liquid crystal display panel (not shown) is an exit surface 13.
【００１１】導光板１１の出射面１３とは反対側の裏面
（以下、反出射面という）には、図示していないが、例
えば黒色のインク等による多数の点状の調光パターン
が、その点状の黒色パターン密度が入射面１２側からそ
の反対側に向かうに従って漸次小さくなるように、設け
られている。Although not shown, on the back surface of the light guide plate 11 on the side opposite to the exit surface 13 (hereinafter referred to as a counter exit surface), a large number of dot-like light control patterns made of, for example, black ink are formed. The dot-shaped black pattern density is provided so as to gradually decrease from the incident surface 12 side toward the opposite side.
【００１２】導光板１１の裏面には反射シート１４が貼
り付けられている。そして、導光板１１の入射面１２と
は反対側の端面つまり反入射面には、光吸収層として、
黒色のインク等からなる光吸収膜１５が形成されてい
る。この光吸収膜１５は、黒色塗料等の光吸収材料が塗
布等の方法により反入射面に密着形成されたものであ
る。したがって、光吸収膜１５と反入射面との間には、
これらと屈折率が異なる空気層等の第３の層が介在され
ていないから、反入射面に入射する光を効率良く吸収
し、出射面１３の反入射面近傍領域からの光の出射を顕
著に抑制することができる。A reflection sheet 14 is attached to the back surface of the light guide plate 11. Then, on the end surface of the light guide plate 11 on the side opposite to the incident surface 12, that is, the anti-incident surface, as a light absorption layer,
A light absorbing film 15 made of black ink or the like is formed. The light absorbing film 15 is formed by closely adhering a light absorbing material such as black paint to the anti-incident surface by a method such as coating. Therefore, between the light absorption film 15 and the anti-incident surface,
Since a third layer such as an air layer having a different refractive index from these is not interposed, the light incident on the anti-incident surface is efficiently absorbed, and the emission of the light from the area near the anti-incident surface of the emission surface 13 is remarkable. Can be suppressed.
【００１３】導光板１１の入射面１２および反入射面を
除く残りの２つの側端面にはそれぞれ、光反射層とし
て、反射シート１６、１７が貼り付けられている。導光
板１１の出射面１３には拡散シート１８およびプリズム
シート１９がこの順で貼り付けられている。導光板１１
の入射面１２と対向する位置には線状の冷陰極管（光
源）２０が配置されている。冷陰極管２０の導光板１１
と対向する側を除いた周囲に、リフレクタ２１が被設さ
れている。このリフレクタ２１の一端部は反射シート１
４の入射面１２側の裏面に貼り付けられ、他端部はプリ
ズムシート１９の入射面１２側の表面に貼り付けられて
いる。Reflecting sheets 16 and 17 are attached as light reflecting layers to the remaining two side end surfaces of the light guide plate 11 except for the incident surface 12 and the non-incident surface. A diffusion sheet 18 and a prism sheet 19 are attached to the emission surface 13 of the light guide plate 11 in this order. Light guide plate 11
A linear cold cathode tube (light source) 20 is arranged at a position facing the incident surface 12 of the. Light guide plate 11 of cold cathode tube 20
A reflector 21 is provided on the periphery except the side opposite to. One end of this reflector 21 has a reflection sheet 1
No. 4 is attached to the back surface on the incident surface 12 side, and the other end is attached to the front surface on the incident surface 12 side of the prism sheet 19.
【００１４】上述のように構成された本実施形態例の照
明装置においては、冷陰極管２０から出た光およびリフ
レクタ２１によって反射された光は、導光板１１の入射
面１２に入射される。この場合、リフレクタ２１は、冷
陰極管２０から射出された光を効率良く導光板１１の入
射面１２に入射させるためのものである。In the lighting device of the present embodiment having the above-described structure, the light emitted from the cold cathode fluorescent lamp 20 and the light reflected by the reflector 21 are incident on the incident surface 12 of the light guide plate 11. In this case, the reflector 21 is for making the light emitted from the cold cathode tubes 20 efficiently enter the incident surface 12 of the light guide plate 11.
【００１５】導光板１１の入射面１２に入射された光
は、出射面１３とその裏面とで全反射を繰り返すと共
に、前記裏から漏れた光が反射シート１４、１６及び１
７により反射されつつ導光板１１内を入射面１２側から
その反対側に向かって進行し（導光され）、その間に、
導光板１１の出射面１３から適量づつ出射される。この
場合、反射シート１４、１６、１７は、導光板１１のそ
れぞれが貼り付けられた面からの光漏れを防止して、光
利用効率を良くするためのものである。なお、それら反
射シート１６、１７は必ずしも設ける必要はなく、照明
装置の用途に応じて適宜省略してもよく、また反射シー
ト１６、１７に代えて、例えば白色インク等の光反射材
料を塗布して反射膜を塗布形成するようにしてもよい。The light incident on the entrance surface 12 of the light guide plate 11 is repeatedly totally reflected by the exit surface 13 and the back surface thereof, and the light leaked from the back surface is reflected by the reflection sheets 14, 16 and 1.
While being reflected by 7, the light travels in the light guide plate 11 from the incident surface 12 side to the opposite side (light is guided), and in the meantime,
An appropriate amount of light is emitted from the emission surface 13 of the light guide plate 11. In this case, the reflection sheets 14, 16 and 17 are for preventing light leakage from the surface on which the light guide plate 11 is attached and improving the light utilization efficiency. The reflection sheets 16 and 17 are not necessarily provided and may be appropriately omitted depending on the application of the lighting device. Instead of the reflection sheets 16 and 17, a light reflection material such as white ink is applied. Alternatively, the reflective film may be formed by coating.
【００１６】導光板１１内を入射面１２側からその反対
側に向かって進行してきた光は、やがて反入射面に入射
する。ここで、反入射面には光吸収膜１５を空気層が介
在しないように密着形成してあるので、反入射面に入射
した光の大部分は光吸収膜１５に吸収される。このた
め、反入射面で反射されこの近傍の出射面１３から出射
される光の量は、従来の反射シート５（図４参照）を設
けた場合に比べて格段に少なくなり、出射面１３の周辺
部における光の輝度分布が均一化される。The light that has traveled through the light guide plate 11 from the incident surface 12 side to the opposite side thereof eventually enters the counter incident surface. Here, since the light absorbing film 15 is closely formed on the anti-incident surface so that no air layer is interposed, most of the light incident on the anti-incident surface is absorbed by the light absorbing film 15. Therefore, the amount of light reflected by the anti-incident surface and emitted from the exit surface 13 in the vicinity thereof is significantly smaller than that in the case where the conventional reflection sheet 5 (see FIG. 4) is provided, and The brightness distribution of light in the peripheral portion is made uniform.
【００１７】導光板１１の出射面１３から出射された光
は、輝度ムラを少なくするため、拡散シート１８によっ
て拡散され、プリズムシート１９によって所期の方向に
照射されるように集光される。そして、この集光された
光が液晶表示パネルの裏面に入射され、液晶表示パネル
の表面から液晶表示パネルの表示駆動に応じた画像光が
出射される。The light emitted from the emission surface 13 of the light guide plate 11 is diffused by the diffusion sheet 18 and is condensed by the prism sheet 19 so that the light is emitted in a desired direction in order to reduce unevenness in brightness. Then, the condensed light is incident on the back surface of the liquid crystal display panel, and image light corresponding to the display drive of the liquid crystal display panel is emitted from the front surface of the liquid crystal display panel.
【００１８】このように、本実施形態例の照明装置で
は、導光板１１の反入射面に入射した光の大部分が光吸
収膜１５に入射して吸収され、反入射面近傍の出射面１
３からの光の出射が顕著に抑制されるので、導光板１１
の出射面１３の周辺部における出射光の輝度分布を均一
化することができる。As described above, in the illumination device of the present embodiment, most of the light incident on the anti-incident surface of the light guide plate 11 is incident on the light absorption film 15 and absorbed, and the exit surface 1 near the anti-incident surface.
Since the emission of light from 3 is significantly suppressed, the light guide plate 11
It is possible to make the luminance distribution of the emitted light uniform in the peripheral portion of the emission surface 13.
【００１９】例えば、図１において一点鎖線で示すよう
に、導光板１１の出射面１３の中央部の領域Ｂ、その周
囲の領域Ｃ、その周囲の領域Ｄにおける各出射光の輝度
がＢ＞Ｃ＞Ｄの順で異なるが、出射面１３の周辺部であ
る領域Ｄにおける出射光の輝度分布は均一化される。For example, as indicated by the alternate long and short dash line in FIG. 1, the brightness of each emitted light in the central region B of the emission surface 13 of the light guide plate 11, the peripheral region C thereof, and the peripheral region D thereof is B> C. Although it is different in the order of> D, the luminance distribution of the emitted light in the region D which is the peripheral portion of the emitting surface 13 is made uniform.
【００２０】次に、この発明の他の実施形態例につい
て、図３に基づき説明する。図３に示す照明装置では、
導光板１１Ａとして、入射面１２側からその反対側の反
入射面側に向かうに従って厚さが漸次薄くなる楔型のも
のを備えている。その他の構成は、図１に示す実施形態
例とほぼ同じである。この楔型導光板１１Ａは、冷陰極
管２０から射出された線状光をそのまま入射させて効率
良く出射面１３から出射させることができ、また、楔型
導光板１１Ａの占有スペースが小さくなるので実装設計
においても有利である。Next, another embodiment of the present invention will be described with reference to FIG. In the lighting device shown in FIG.
The light guide plate 11A is provided with a wedge-shaped plate whose thickness gradually decreases from the side of the incident surface 12 toward the opposite side of the incident surface. Other configurations are almost the same as those of the embodiment shown in FIG. In this wedge-shaped light guide plate 11A, the linear light emitted from the cold cathode tubes 20 can be directly incident and can be efficiently emitted from the emission surface 13, and the occupied space of the wedge-shaped light guide plate 11A can be reduced. It is also advantageous in mounting design.
【００２１】そして、楔型導光板１１Ａを用いた照明装
置においては、反入射面に反射シート等の反射膜を設置
した場合、この反射膜で反射されてその近傍の出射面１
３から出射する光が多くなり、その反出射側周辺領域の
輝度が局部的に高くなる傾向がより顕著である。In the illuminating device using the wedge-shaped light guide plate 11A, when a reflection film such as a reflection sheet is provided on the anti-incident surface, the reflection surface reflects light from the reflection film and the exit surface 1 in the vicinity thereof.
It is more prominent that the amount of light emitted from No. 3 increases and the luminance of the peripheral region on the side opposite to the emission side locally increases.
【００２２】しかし、本実施形態の照明装置において
は、反入射面に光吸収膜１５を塗布形成してあるから、
反入射面に入射する光を効率良く吸収でき、楔型導光板
１１Ａを用いた照明装置においても、反出射側周辺領域
の輝度を他の側部周辺領域とほぼ同じ輝度に抑え、出射
面１３の周辺部の輝度分布を均一化することが可能とな
る。However, in the illuminating device of this embodiment, since the light absorption film 15 is formed by coating on the anti-incident surface,
Light incident on the anti-incident surface can be efficiently absorbed, and even in an illumination device using the wedge-shaped light guide plate 11A, the brightness of the anti-emission side peripheral region is suppressed to almost the same brightness as the other side peripheral regions, and the emission surface 13 It is possible to uniformize the luminance distribution in the peripheral portion of.
【００２３】なお、光吸収膜１５の材料は、黒色のイン
クや塗料等からなる黒色材に限定されるものではなく、
導光板１１、１１Ａの形状や入射光の性状により変化す
る出射面１３の周辺部の輝度ムラの発現程度に応じて、
灰色のインク等からなる灰色材等であってもよい。ま
た、光吸収層としては、光吸収膜１５のように塗装被着
されたものに限らず、出射面１３の周辺部の輝度ムラの
発現度合いによっては、光吸収能を有する光吸収シート
を反入射面に貼着したものでもよく、この光吸収シート
によっても出射面１３の周辺部の輝度分布を均一化する
ことは可能である。The material of the light absorbing film 15 is not limited to a black material such as black ink or paint,
Depending on the degree of occurrence of uneven brightness in the peripheral portion of the emission surface 13, which changes depending on the shapes of the light guide plates 11 and 11A and the properties of the incident light,
A gray material made of gray ink or the like may be used. Further, the light absorbing layer is not limited to the one coated by coating like the light absorbing film 15, and a light absorbing sheet having light absorbing ability may be used depending on the degree of uneven brightness in the peripheral portion of the emitting surface 13. It may be attached to the incident surface, and this light absorbing sheet can also make the luminance distribution in the peripheral portion of the emitting surface 13 uniform.
【００２４】さらに、本発明は、光源が線光源ではなく
ＬＥＤ等の点光源を複数設けた照明装置、あるいは、矩
形状導光板の場合に入射面を一端面でなく例えば隣り合
う二端面を入射面とした照明装置等にも好適に適用でき
る。Further, according to the present invention, when the light source is not a linear light source but a plurality of point light sources such as LEDs, or a rectangular light guide plate, the incident surface is not one end surface but two adjacent end surfaces. It can be suitably applied to a lighting device having a flat surface.
【００２５】[0025]
【発明の効果】以上説明したように、この発明によれ
ば、導光板の入射面とは反対側の端面に光吸収層を設置
しているので、入射面とは反対側の端面に入射した光の
大部分を効率良く吸収し、入射面とは反対側の端面近傍
の出射面から発せられる光量を抑制することができ、こ
れにより導光板の出射面の周辺部の輝度分布を均一化す
ることができる。As described above, according to the present invention, since the light absorbing layer is provided on the end surface of the light guide plate opposite to the incident surface, the light is incident on the end surface opposite to the incident surface. Most of the light is efficiently absorbed, and the amount of light emitted from the emission surface near the end surface on the side opposite to the incidence surface can be suppressed, thereby making the brightness distribution around the emission surface of the light guide plate uniform. be able to.
【図１】この発明の一実施形態としての照明装置の平面
図。FIG. 1 is a plan view of a lighting device as an embodiment of the invention.
【図２】図１のＸ−Ｘ線に沿う断面図。FIG. 2 is a sectional view taken along line XX in FIG.
【図３】この発明の他の実施形態としての照明装置の図
２と同様の断面図。FIG. 3 is a cross-sectional view similar to FIG. 2 of a lighting device as another embodiment of the present invention.
【図４】従来の照明装置の一例の平面図。FIG. 4 is a plan view of an example of a conventional lighting device.
１１、１１Ａ 導光板１２ 入射面１３ 出射面１４ 反射シート１５ 光吸収膜１６、１７ 反射シート１８ 拡散シート１９ プリズムシート２０ 冷陰極管２１ リフレクタ11, 11A light guide plate12 Incident surface13 Exit surface14 Reflective sheet15 Light absorbing film16,17 Reflective sheet18 Diffusion sheet19 prism sheet20 Cold cathode tube21 reflector
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002081580AJP2003281920A (en) | 2002-03-22 | 2002-03-22 | Lighting equipment |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002081580AJP2003281920A (en) | 2002-03-22 | 2002-03-22 | Lighting equipment |
| Publication Number | Publication Date |
|---|---|
| JP2003281920Atrue JP2003281920A (en) | 2003-10-03 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002081580APendingJP2003281920A (en) | 2002-03-22 | 2002-03-22 | Lighting equipment |
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| JP (1) | JP2003281920A (en) |
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