JP3262650B2 - Surface emitting device - Google Patents
Surface emitting deviceInfo
- Publication number
- JP3262650B2 JP3262650B2 JP25492693A JP25492693A JP3262650B2 JP 3262650 B2 JP3262650 B2 JP 3262650B2 JP 25492693 A JP25492693 A JP 25492693A JP 25492693 A JP25492693 A JP 25492693A JP 3262650 B2 JP3262650 B2 JP 3262650B2
- Authority
- JP
- Japan
- Prior art keywords
- reflector
- chevron
- light source
- slope
- emitting device
- 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.)
- Expired - Fee Related
Links
Landscapes
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電飾照明、ノートパソ
コン、ワープロ、液晶テレビのバックライトなどに利用
できる直下方式の面発光装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct type surface light emitting device which can be used for illumination lighting, notebook computers, word processors, backlights of liquid crystal televisions, and the like.
【０００２】[0002]
【従来の技術】従来より、拡散板の裏面に線光源が配置
され、線光源の背面に反射板が配置された直下方式の面
発光装置としては、真っ直ぐな線光源が拡散板の裏面に
平行に配置され、反射板が線光源間に線光源と平行に突
出した山形反射部を有し、その山形反射部の頂点が次式
１ ｈ1＞Ｈ＞ｈ2 （１） （ただし、Ｈは反射板底部から山形反射部の頂点までの
高さ、ｈ1は反射板底部から線光源管上端までの高さ、
ｈ2は反射板底部から線光源管下端までの高さをそれぞ
れ示す）を満たし、山形反射部の斜面の断面が滑らかな
凹曲線を描くものがあった（実開平３−１２２８２号公
報）。2. Description of the Related Art Conventionally, as a direct type surface light emitting device in which a line light source is arranged on the back surface of a diffusion plate and a reflection plate is arranged on the back surface of the line light source, a straight line light source is parallel to the back surface of the diffusion plate. And the reflector has a mountain-shaped reflecting portion between the line light sources and protruding in parallel with the line light source, and the peak of the mountain-shaped reflecting portion has the following formula 1 h 1 >H> h 2 (1) (where H is reflector from the bottom to the apex of the chevron reflecting portion height, h 1 is the reflection plate from the bottom to the line light source tube upper height,
h 2 had those reflector bottom meets shown), respectively the height of the up line source tube from the lower end, the slope of the cross section of the chevron reflecting portion draws a smooth concave curve (actual Hei 3-12282 Patent Publication).
【０００３】また、山形反射部の断面が三角形状の面発
光装置もあった（実公平４−４９６４７号公報）。There has also been a surface light emitting device in which the cross section of a chevron-shaped reflector is triangular (Japanese Utility Model Publication No. 4-49647).
【０００４】これらの面発光装置の山形反射部は、線光
源からの直接光を反射させ、拡散板側に導光するために
設けられている。The chevron-shaped reflectors of these surface light emitting devices are provided to reflect the direct light from the line light source and guide the light to the diffuser side.
【０００５】[0005]
【発明が解決しようとする課題】しかし、従来の面発光
装置では、その山形反射部の形状によって以下のような
問題が発生していた。However, in the conventional surface light emitting device, the following problem has occurred due to the shape of the chevron reflection portion.
【０００６】すなわち、山形反射部３の斜面の断面が滑
らかな凹曲線を描くものの場合、山形反射部３の頂上付
近に当たった光線４が線光源１側に反射されるので、拡
散板側に直接的に導光することはできなかった。そのた
め、拡散板において、山形反射部３の頂上近傍が暗くな
らざるを得なかった（図３参照）。That is, when the cross section of the slope of the chevron reflector 3 has a smooth concave curve, the light beam 4 hitting the top of the chevron reflector 3 is reflected to the line light source 1 side, so Light could not be guided directly. Therefore, in the diffusion plate, the vicinity of the top of the chevron reflection part 3 had to be dark (see FIG. 3).
【０００７】また、山形反射部３の断面が三角形状の場
合、山形反射部３の麓付近に当たった光線４が線光源１
側に反射されるので、拡散板側に直接的に導光すること
はできなかった。そのため、拡散板において、山形反射
部３の麓近傍が暗くならざるを得なかった（図４参
照）。When the cross section of the chevron reflector 3 is triangular, the light beam 4 hitting near the foot of the chevron reflector 3 is reflected by the linear light source 1.
Since the light was reflected to the side, the light could not be guided directly to the diffuser side. For this reason, in the diffusion plate, the vicinity of the foot of the chevron reflector 3 had to be darkened (see FIG. 4).
【０００８】したがって、いずれの場合も、拡散板に暗
いスジや光ムラが発生し、高輝度の面発光が得られなか
った。本発明は、以上のような問題点を解消し、部分的
な暗いスジや光ムラが発生せず、高輝度の面発光装置を
提供することを目的とする。Therefore, in any case, dark stripes or uneven light were generated on the diffusion plate, and high-luminance surface light emission could not be obtained. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems and to provide a high-luminance surface light-emitting device that does not generate partial dark streaks or light unevenness.
【０００９】[0009]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明の面発光装置は、複数の真っ直ぐな線光源
が拡散板の裏面に平行に配置され、線光源の背面に反射
板が配置され、反射板が線光源間に線光源と平行に突出
した山形反射部を有し、その山形反射部の頂点が ｈ１＞Ｈ＞ｈ２ （式１） （ただし、Ｈは反射板底部から山形反射部の頂点までの
高さ、ｈ１は反射板底部から線光源管上端までの高さ、
ｈ２は反射板底部から線光源管下端までの高さをそれぞ
れ示す。）を満たしている面発光装置において、山形反
射部の斜面が複数面から形成され、その傾斜の変化が θ１＞θ２＞θ３＞…＞θｎ （式２） （ただし、θｎは反射板の麓に近い側からｎ番目の傾斜
面と拡散板の垂線との間の角度を示す。）を満たしてお
り且つこれらの傾斜が麓付近の面に照射された光線、頂
上に近い側の面に照射された光線、その他いずれの箇所
に照射された光線も拡散反射板側に反射するものである
ように構成した。In order to achieve the above object, a surface light emitting device according to the present invention comprises a plurality of straight line light sources arranged in parallel with the back surface of a diffusion plate, and a reflection plate on the back surface of the line light source. Is disposed, and the reflector has a mountain-shaped reflecting portion between the line light sources that protrudes in parallel with the line light source, and the peak of the mountain-shaped reflecting portion is h1>H> h2 (Equation 1) (where H is a distance from the bottom of the reflecting plate. The height from the top of the chevron reflector, h1 is the height from the bottom of the reflector to the top of the line light source tube,
h2 indicates the height from the bottom of the reflector to the lower end of the line light source tube, respectively. ), The slope of the chevron reflector is formed from a plurality of surfaces, and the change in the slope is θ1>θ2>θ3>...> Θn (Equation 2) (where θn is at the foot of the reflector. (Indicating the angle between the n-th slope from the near side and the perpendicular to the diffuser)) and these slopes illuminate the surface near the foot, illuminate the surface near the top The light beam irradiated on the diffuse reflection plate side is also reflected on the diffuse reflection plate side.
【００１０】また、本発明の面発光装置は、複数の平行
な直管部を有する屈曲した線光源が拡散板の裏面に配置
され、線光源の背面に反射板が配置され、反射板が線光
源の直管部間に直管部と平行に突出した山形反射部を有
し、その山形反射部の頂点が式１を満たしている面発光
装置において、山形反射部の斜面が複数面から形成さ
れ、その傾斜の変化が式２を満たしており且つこれらの
傾斜が麓付近の面に照射された光線、頂上に近い側の面
に照射された光線、その他いずれの箇所に照射された光
線も拡散反射板側に反射するものであるように構成し
た。Further, in the surface light emitting device of the present invention, a bent linear light source having a plurality of parallel straight pipe portions is disposed on a back surface of the diffuser, a reflective plate is disposed on a rear surface of the linear light source, and the reflective plate is a linear light source. In a surface light emitting device having a chevron-shaped reflector protruding in parallel with the straight tube portion between the straight tube portions of the light source, and the apex of the chevron-shaped reflector satisfies Equation 1, the slope of the chevron-shaped reflector is formed from a plurality of surfaces. And the change in the slope satisfies Equation 2, and the light rays applied to the surface near the foot, the light applied to the surface near the top, and the light applied to any other location The light was reflected to the diffuse reflection plate side.
【００１１】以下、図面を参照しながら、本発明をさら
に詳しく説明する。Hereinafter, the present invention will be described in more detail with reference to the drawings.
【００１２】図１は本発明に係る面発光装置の一実施例
を示す断面図、図２は図１の面発光装置における光の反
射を示す断面図である。１は線光源、２は反射板、３は
山形反射部、４は光線をそれぞれ示す。FIG. 1 is a sectional view showing an embodiment of the surface light emitting device according to the present invention, and FIG. 2 is a sectional view showing light reflection in the surface light emitting device of FIG. 1 is a line light source, 2 is a reflector, 3 is a chevron reflector, and 4 is a light ray.
【００１３】線光源１が拡散板の裏面に配置される。拡
散板としては、乳白色のアクリル板や、ポリエチレンテ
レフタレート樹脂やポリカーボネイト樹脂などの樹脂板
を使用するとよい。また、線光源１としては、真っ直ぐ
な形状の熱陰極線管や冷陰極線管などの陰極線管を複数
用い、平行に並べる。A line light source 1 is arranged on the back surface of the diffusion plate. As the diffusion plate, a milky white acrylic plate or a resin plate such as a polyethylene terephthalate resin or a polycarbonate resin may be used. Further, as the line light source 1, a plurality of cathode ray tubes such as a hot cathode ray tube and a cold cathode ray tube having a straight shape are used and arranged in parallel.
【００１４】線光源１の背面には反射板２が配置され
る。この反射板２は、線光源１間に線光源１と平行に突
出した山形反射部３を有する。なお、山形反射部３は、
反射板２と一体的に形成されたものでも別体に形成され
たものでもよい。反射板２および山形反射部３としては
ポリスチレン樹脂、ポリカーボネイト樹脂、アクリロニ
トリルブタジエンスチレン樹脂などの樹脂からなるもの
を用いる。また、山形反射部３は、Ｈを反射板底部から
山形反射部の頂点までの高さ、ｈ1を反射板底部から線
光源管上端までの高さ、ｈ2を反射板底部から線光源管
下端までの高さとしたとき、その頂点が次式１ ｈ1＞Ｈ＞ｈ2 （式１） を満たしている。On the back of the line light source 1, a reflector 2 is arranged. The reflection plate 2 has a chevron-shaped reflector 3 between the line light sources 1 and projecting in parallel with the line light source 1. In addition, the chevron reflector 3
It may be formed integrally with the reflection plate 2 or may be formed separately. The reflection plate 2 and the chevron reflection portion 3 are made of a resin such as a polystyrene resin, a polycarbonate resin, and an acrylonitrile butadiene styrene resin. Further, Yamagata reflection part 3, the height of the H from the reflecting plate bottom to the apex of the chevron reflecting portion, the height of the h 1 from the reflection plate bottom to line source tube upper, linear light pipe h 2 from the reflector bottom When the height is set to the lower end, the vertex satisfies the following expression 1 h 1 >H> h 2 (expression 1).
【００１５】さらに、山形反射部３は、本発明の特徴で
ある次の構成を有している（図１参照）。すなわち、山
形反射部３の斜面が複数面から形成されてその傾斜の変
化が、θｎを反射板の麓に近い側からｎ番目の傾斜面と
拡散板の垂線との間の角度としたとき、その変化が次式
２ θ１＞θ２＞θ３＞…＞θｎ （式２） を満たしており且つこれらの傾斜が麓付近の面に照射さ
れた光線、頂上に近い側の面に照射された光線、その他
いずれの箇所に照射された光線も拡散反射板側に反射す
るものである。山形反射部３が、このような斜面とする
ことにより、光のロスがなく、均一な面発光が得られる
のである。Further, the chevron reflector 3 has the following configuration which is a feature of the present invention (see FIG. 1). That is, when the slope of the chevron reflector 3 is formed from a plurality of surfaces and the change in the slope is θn, the angle between the n-th slope from the side close to the foot of the reflector and the perpendicular to the diffuser is: The change satisfies the following equation 2 θ1>θ2> θ3 >>... Θn (Equation 2), and these inclinations are rays radiated to the surface near the foot, rays radiated to the surface near the top, Light rays applied to any other locations are reflected on the diffuse reflection plate side. When the chevron-shaped reflecting portion 3 has such a slope, uniform surface light emission can be obtained without light loss.
【００１６】なお、線光源１は、上記のように真っ直ぐ
な形状のものを複数平行に配置する代わりに、複数の平
行な直管部を有する屈曲した線光源１をひとつ配置して
もよい。屈曲した線光源１の形状としては、たとえばＵ
字状やＷ字状などがある。また、屈曲した線光源１を用
いる場合、山形反射部３は線光源１の直管部間に直管部
と平行に突出させる。Instead of arranging a plurality of straight light sources in parallel as described above, one curved line light source 1 having a plurality of parallel straight pipe portions may be arranged. The shape of the bent linear light source 1 is, for example, U
There are a letter shape and a W shape. When the bent linear light source 1 is used, the chevron-shaped reflecting portion 3 projects between the straight pipe portions of the linear light source 1 in parallel with the straight pipe portion.
【００１７】[0017]
【作用】本発明の面発光装置は、上記のように構成した
ので、次の作用が得られる。The surface light emitting device of the present invention is constructed as described above, and has the following effects.
【００１８】すなわち、本発明の面発光装置は、山形反
射部の斜面が複数面から形成されてその複数の傾斜面と
拡散板の垂線との間の角度θを、反射板の麓に近い側か
ら頂上に近付けるに従いに小さくなるようしているた
め、山形反射部の斜面の反射板の麓付近に照射された光
線、山形反射部の斜面の頂上に近い側に照射された光
線、その他いずれの箇所に照射された光線も拡散板側に
反射され、また、光のロスもない（図２参照）。That is, in the surface emitting device of the present invention, the slope of the chevron-shaped reflector is formed from a plurality of surfaces, and the angle θ between the plurality of slopes and the perpendicular of the diffuser is set to the side closer to the foot of the reflector. From the bottom of the reflector on the slope of the chevron reflector, the light beam on the side near the top of the slope of the chevron reflector, and any other The light beam applied to the location is also reflected on the diffuser side, and there is no light loss (see FIG. 2).
【００１９】[0019]
【実施例】４つの平行な直管部を有する直径６mmのＷ字
状の冷陰極線管を線光源１として用い、厚さ２mmの乳白
色アクリル板（三菱レイヨン社製：アクリライトＬ＃43
5）からなる拡散板の裏面に配置した。EXAMPLE A cold cathode ray tube having a diameter of 6 mm and a W-shaped cold cathode ray tube having four parallel straight tube portions was used as a line light source 1 and a milky white acrylic plate having a thickness of 2 mm (Acrylite L # 43 manufactured by Mitsubishi Rayon Co., Ltd.).
It was arranged on the back of the diffusion plate consisting of 5).
【００２０】また、θ1＝75°、θ2＝60°、θ3＝40°
の複数面からなる斜面を有し、線光源の直管部間に直管
部と平行に突出可能な山形反射部を有する反射板を白色
のポリカーボネイト樹脂で成形し、線光源の背面に配置
した。Further, θ 1 = 75 °, θ 2 = 60 °, θ 3 = 40 °
A reflector having a slope composed of a plurality of surfaces and having a chevron-shaped reflecting portion that can protrude in parallel with the straight pipe portion between the straight pipe portions of the line light source was molded of white polycarbonate resin and disposed on the back of the line light source. .
【００２１】このようにして得られた面発光装置は、均
一で高輝度の面発光が得られるものであった。The surface light-emitting device obtained in this way was capable of obtaining uniform and high-luminance surface light.
【００２２】[0022]
【発明の効果】この発明は、上記の構成および作用から
なるので、次の効果が得られる。Since the present invention has the above-described structure and operation, the following effects can be obtained.
【００２３】すなわち、山形反射部の斜面の反射板底部
に近い側に照射された光線、山形反射部の斜面の頂上に
近い側に照射された光線、その他いずれの箇所に照射さ
れた光線も拡散板側に反射され、また、光のロスもない
ので、部分的な暗いスジや光ムラが発生せず、高輝度の
面発光が得られる。That is, the light beam radiated to the side of the slope of the mountain-shaped reflector near the bottom of the reflector, the beam radiated to the side near the top of the slope of the mountain-shaped reflector, and the beam radiated to any other location are also diffused. Since the light is reflected to the plate side and there is no light loss, partial dark streaks and light unevenness do not occur, and high-luminance surface light emission can be obtained.
【図１】本発明に係る面発光装置の一実施例を示す断面
図である。FIG. 1 is a sectional view showing one embodiment of a surface emitting device according to the present invention.
【図２】図１の面発光装置における光の反射を示す断面
図である。FIG. 2 is a cross-sectional view showing light reflection in the surface light emitting device of FIG.
【図３】従来の面発光装置における光の反射を示す断面
図である。FIG. 3 is a cross-sectional view showing light reflection in a conventional surface light emitting device.
【図４】従来の面発光装置における光の反射を示す断面
図である。FIG. 4 is a cross-sectional view showing light reflection in a conventional surface emitting device.
１ 線光源 ２ 反射板 ３ 山形反射部 ４ 光線 REFERENCE SIGNS LIST 1 line light source 2 reflector 3 chevron reflector 4 light beam
フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G02F 1/13357 F21V 8/00 Continuation of the front page (58) Field surveyed (Int.Cl. 7 , DB name) G02F 1/13357 F21V 8/00
Claims (2)
に平行に配置され、線光源の背面に反射板が配置され、
反射板が線光源間に線光源と平行に突出した山形反射部
を有し、その山形反射部の頂点が ｈ１＞Ｈ＞ｈ２ （式１） （ただし、Ｈは反射板底部から山形反射部の頂点までの
高さ、ｈ１は反射板底部から線光源管上端までの高さ、
ｈ２は反射板底部から線光源管下端までの高さをそれぞ
れ示す。）を満たしている面発光装置において、山形反
射部の斜面が複数面から形成され、その傾斜の変化が θ１＞θ２＞θ３＞…＞θｎ （式２） （ただし、θｎは反射板の麓に近い側からｎ番目の傾斜
面と拡散板の垂線との間の角度を示す。）を満たしてお
り且つこれらの傾斜が麓付近の面に照射された光線、頂
上に近い側の面に照射された光線、その他いずれの箇所
に照射された光線も拡散反射板側に反射するものである
ことを特徴とする面発光装置。1. A plurality of straight line light sources are arranged in parallel on a back surface of a diffusion plate, and a reflection plate is arranged on a back surface of the line light source.
The reflector has a chevron reflector between the line light sources that protrudes in parallel with the line light source, and the peak of the crest is h1>H> h2 (Equation 1) (where H is the height of the chevron reflector from the bottom of the reflector. Height to the top, h1 is the height from the bottom of the reflector to the top of the line light source tube,
h2 indicates the height from the bottom of the reflector to the lower end of the line light source tube, respectively. ), The slope of the chevron reflector is formed from a plurality of surfaces, and the change in the slope is θ1>θ2>θ3>...> Θn (Equation 2) (where θn is at the foot of the reflector. Contact meet.) indicating the angle between the n-th of the inclined surface and the normal to the diffuser plate from the side closer
And these slopes cause the light rays,
Rays illuminated on the surface closer to the top, and any other locations
The surface light emitting device characterized in that the light rays applied to the surface are also reflected to the diffuse reflection plate side .
光源が拡散板の裏面に配置され、線光源の背面に反射板
が配置され、反射板が線光源の直管部間に直管部と平行
に突出した山形反射部を有し、その山形反射部の頂点が
式１を満たしている面発光装置において、山形反射部の
斜面が複数面から形成され、その傾斜の変化が式２を満
たしており且つこれらの傾斜が麓付近の面に照射された
光線、頂上に近い側の面に照射された光線、その他いず
れの箇所に照射された光線も拡散反射板側に反射するも
のであることを特徴とする面発光装置。2. A bent linear light source having a plurality of parallel straight pipe portions is disposed on the back surface of the diffuser plate, a reflector plate is disposed on the back surface of the linear light source, and the reflector plate is disposed between the straight pipe portions of the linear light source. In a surface light emitting device having a chevron-shaped reflector protruding in parallel with the tube portion, and the vertex of the chevron-shaped reflector satisfies Equation 1, the slope of the chevron-shaped reflector is formed from a plurality of surfaces, and the change in the slope is expressed by the following equation. 2 and these slopes illuminated the surface near the foot
Rays, rays shining on the surface near the top, or any other
The light rays applied to these areas are also reflected to the diffuse reflector side.
A surface light-emitting device, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25492693A JP3262650B2 (en) | 1993-09-16 | 1993-09-16 | Surface emitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25492693A JP3262650B2 (en) | 1993-09-16 | 1993-09-16 | Surface emitting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0784258A JPH0784258A (en) | 1995-03-31 |
| JP3262650B2 true JP3262650B2 (en) | 2002-03-04 |
Family
ID=17271780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25492693A Expired - Fee Related JP3262650B2 (en) | 1993-09-16 | 1993-09-16 | Surface emitting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3262650B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09290926A (en) * | 1996-04-26 | 1997-11-11 | Kawasaki Heavy Ind Ltd | Bagged cargo carry-out equipment |
-
1993
- 1993-09-16 JP JP25492693A patent/JP3262650B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0784258A (en) | 1995-03-31 |
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