JP2540549B2 - Lighting equipment - Google Patents
Lighting equipmentInfo
- Publication number
- JP2540549B2 JP2540549B2 JP62166522A JP16652287A JP2540549B2 JP 2540549 B2 JP2540549 B2 JP 2540549B2 JP 62166522 A JP62166522 A JP 62166522A JP 16652287 A JP16652287 A JP 16652287A JP 2540549 B2 JP2540549 B2 JP 2540549B2
- Authority
- JP
- Japan
- Prior art keywords
- light source
- linear light
- fresnel
- light guide
- shaped surface
- 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 - Lifetime
Links
Landscapes
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、液晶を風疹ディスプレイのバックライト等
に用いる照明装置に関する。TECHNICAL FIELD The present invention relates to an illuminating device that uses liquid crystal as a backlight of a rubella display or the like.
〔従来技術及び発明が解決しようとする問題点〕 この種従来の照明装置としては、例えば実開昭60−94
605号公報に記載のものがあるが、これは第３図に示し
た如き構造を有していた。即ち、蛍光管等の線状光源１
と、平面形状が矩形を呈し且つ断面形状が楔形を呈して
いてその幅広端面が入射端面2aとして線状光源１に沿う
と共に底面に線状光源１の軸方向と平行な多数の溝壁面
から成るフレネル形状面2bが形成されたアクリル樹脂又
はポリカーボネート樹脂製等の透明な導光体２と、導光
体２の下面から線状光源１の外周の一部にかけて包囲す
る反射鏡板３と、導光体２の上側に配置された拡散板４
とから成っていた。そして、線状光源１の中心軸Ｏを発
した光は、入射端面2aから導光体２内に入射し、その一
部は導光体２の上面2cで全反射し続いて下面であるフレ
ネル形状面2bで反射した後上面2cを突き抜けて拡散板４
に達し、他の一部は直接フレネル形状面2bで反射した後
上面2cを突き抜けて拡散板４に達し、更に残りの部分は
直接上面2cに達した後そのまま突き抜けて拡散板４に達
するか、或はフレネル形状面2bを透過し続いて反射鏡板
３で反射した後フレネル形状面2b及び上面2cを突き抜け
て拡散板４に達するかなどし、こうして拡散板４に達し
た光全体は拡散せしめられて面状に照射されるようにな
っていた。[Problems to be Solved by the Prior Art and Invention] As a conventional lighting device of this type, for example, the Japanese Utility Model Laid-Open No. 60-94
There is one disclosed in Japanese Patent No. 605, which has a structure as shown in FIG. That is, a linear light source 1 such as a fluorescent tube
And has a rectangular planar shape and a wedge-shaped cross section, and the wide end face thereof is formed along the linear light source 1 as the incident end face 2a, and the bottom face is composed of a large number of groove wall faces parallel to the axial direction of the linear light source 1. A transparent light guide 2 made of acrylic resin or polycarbonate resin having a Fresnel-shaped surface 2b, a reflector plate 3 surrounding the lower surface of the light guide 2 to a part of the outer periphery of the linear light source 1, and a light guide. Diffusion plate 4 located above body 2
And consisted of Then, the light emitted from the central axis O of the linear light source 1 enters the light guide 2 through the incident end surface 2a, and a part of the light is totally reflected by the upper surface 2c of the light guide 2 and then Fresnel which is the lower surface. After being reflected by the shape surface 2b, it penetrates through the upper surface 2c and diffuser plate 4
Or the other part directly reflects on the Fresnel-shaped surface 2b and then penetrates the upper surface 2c to reach the diffuser plate 4, and the remaining part directly reaches the upper surface 2c and then penetrates as it is to the diffuser plate 4, or Or, after passing through the Fresnel-shaped surface 2b and then reflected by the reflecting mirror plate 3 and then penetrating through the Fresnel-shaped surface 2b and the upper surface 2c to reach the diffuser plate 4, etc., the entire light reaching the diffuser plate 4 is diffused. It was supposed to be irradiated in a plane.
ところが、フレネル形状面2bで反射される光に着目す
ると、上記従来例の場合フレネル形状面2bの各溝壁面の
傾き（反射鏡板３の反射面に対する傾き）が線状光源１
からの距離の違いにかかわらず一定であったため、線状
光源１からフレネル形状面2bの各帯状面へ入射する光の
入射角は線状光源１から遠ざかるにつれて大となるの
で、その反射光の広がりも線状光源１から遠ざかるにつ
れて大となり、その結果拡散板４上での光束密度が線状
光源１から遠ざかるにつれて小さくなり、拡散板４全体
の輝度が不均一になるという問題があった。However, focusing on the light reflected by the Fresnel-shaped surface 2b, in the case of the above-mentioned conventional example, the inclination of the wall surface of each groove of the Fresnel-shaped surface 2b (the inclination with respect to the reflecting surface of the reflector plate 3) is the linear light source 1.
Since it was constant regardless of the distance from the linear light source 1, the incident angle of the light incident on each strip-shaped surface of the Fresnel-shaped surface 2b from the linear light source 1 becomes larger as the distance from the linear light source 1 increases. The spread also increases as the distance from the linear light source 1 increases, and as a result, the luminous flux density on the diffuser plate 4 decreases as the distance from the linear light source 1 increases, causing a problem in that the brightness of the entire diffuser plate 4 becomes uneven.
本発明は、上記問題点に鑑み、面光源として均一な輝
度分布が得られる照明装置を提供することを目的とす
る。In view of the above problems, it is an object of the present invention to provide an illuminating device that can obtain a uniform luminance distribution as a surface light source.
本発明による照明装置は、線状光源と、断面形状が楔
形を呈し且つその幅広端面が入射端面として前記線状光
源に沿うと共に底面に前記線状光源の軸方向と平行な多
数の溝壁面から成るフレネル形状面が形成された透明材
の導光体と、前記導光体の下側に配置された反射鏡板
と、前記導光体の上側に配置された拡散板とから成る照
明装置において、前記フレネル形状面の少なくとも前記
線状光源側に面した各溝壁面の傾きが前記線状光源から
遠ざかるにつれて大となるように構成したことにより、
線状光源からフレネル形状面の各溝壁面へ入射する光の
入射角が線状光源から遠ざかるにつれて小となるように
して、その反射光の広がりも線状光源から遠ざかるにつ
れて小となるようにし、拡散面上の光束密度が等しくな
るようにしたものである。The illuminating device according to the present invention includes a linear light source, and a plurality of groove wall surfaces that are wedge-shaped in cross section and that have a wide end face along the linear light source as an incident end face and a bottom face parallel to the axial direction of the linear light source. In a lighting device comprising a transparent light guide body having a Fresnel-shaped surface formed thereon, a reflector plate arranged below the light guide body, and a diffusion plate arranged above the light guide body, By configuring so that the inclination of each groove wall surface facing at least the linear light source side of the Fresnel-shaped surface becomes larger as the distance from the linear light source increases.
The incident angle of the light incident on each groove wall surface of the Fresnel-shaped surface from the linear light source becomes smaller as the distance from the linear light source increases, and the spread of the reflected light also becomes smaller as the distance from the linear light source increases. The light flux density on the diffusion surface is made equal.
以下、図示した一実施例に基づき上記従来例と同一の
部材には同一符号を付し、本発明を詳細に説明する。The present invention will be described in detail below with reference to the same members as those of the above-mentioned conventional example based on the illustrated embodiment and the same reference numerals.
第１図は本実施例全体の一部を省略して示した斜視
図、第２図はその要部拡大断面図であって、線状光源１
及び導光体２が一対ずつ左右に対称的に配置されている
が、導光体２のフレネル形状面2bは上記従来例とは異な
り、その各溝壁面の傾き（反射鏡板３の反射面に対する
傾き）が線状光源１から遠ざかるにつれて側次大となる
ように構成されている（第２図）。従って、線状光源１
からフレネル形状面2bの各溝壁面へ入射する光の入射角
が線状光源１から遠ざかるにつれて小となるので、その
反射光の広がりが線状光源１から遠ざかるにつれて小と
なる。又、この作用は、一旦導光体２の上面2cで全反射
してからフレネル形状面2bに入射する光に対しても同様
になされる。従って、フレネル形状面2bの溝壁面の傾き
の変化の度合を適当に選定することにより、フレネル形
状面2bによる反射光の拡散板４に達する光束密度を線状
光源１からの距離の違いにかかわらず均一にして拡散板
４全体の輝度を均一にすることができる。又、本発明面
光源装置は、上記説明から明らかなように線状光源１を
側端に配置した構成で均一な輝度分布が得られるので、
その厚さは線状光源１の径と反射鏡板３の厚さと拡散板
４の厚さの和のみによって決めることができ、従って薄
型化が可能である。FIG. 1 is a perspective view in which a part of the whole of the present embodiment is omitted, and FIG. 2 is an enlarged cross-sectional view of the main part of the linear light source 1.
The pair of light guides 2 are symmetrically arranged in the left-right direction, but the Fresnel-shaped surface 2b of the light guide 2 is different from the above-mentioned conventional example in that the inclination of each groove wall surface (with respect to the reflection surface of the reflector plate 3). The inclination becomes larger as the distance from the linear light source 1 increases (FIG. 2). Therefore, the linear light source 1
Since the incident angle of the light incident on each groove wall surface of the Fresnel-shaped surface 2b becomes smaller as the distance from the linear light source 1 increases, the spread of the reflected light becomes smaller as the distance from the linear light source 1 increases. Further, this action is similarly performed on the light which is totally reflected on the upper surface 2c of the light guide 2 and then enters the Fresnel-shaped surface 2b. Therefore, by appropriately selecting the degree of change in the inclination of the groove wall surface of the Fresnel-shaped surface 2b, the luminous flux density of the reflected light by the Fresnel-shaped surface 2b reaching the diffuser plate 4 is affected by the difference in the distance from the linear light source 1. However, the brightness of the entire diffusion plate 4 can be made uniform. Further, in the surface light source device of the present invention, as is clear from the above description, a uniform luminance distribution can be obtained with the configuration in which the linear light source 1 is arranged at the side end.
The thickness can be determined only by the sum of the diameter of the linear light source 1, the thickness of the reflector plate 3 and the thickness of the diffuser plate 4, and therefore the thickness can be reduced.
尚、導光体２のフレネル形状面2bの各溝壁面は平面に
限らず曲面であっても良い。又、反射鏡板３は、導光体
２の下側に位置する部分と線状光源１の周囲に位置する
部分とを別体に形成しても良い。The groove wall surfaces of the Fresnel-shaped surface 2b of the light guide 2 are not limited to flat surfaces and may be curved surfaces. Further, the reflector plate 3 may be formed such that a portion located below the light guide 2 and a portion located around the linear light source 1 are formed separately.
上述の如く、本発明による照明装置は、面光源として
均一な輝度分布が得られ、而も薄型化が可能であるとい
う実用上重要な利点を有している。As described above, the illuminating device according to the present invention has a practically important advantage that a uniform luminance distribution can be obtained as a surface light source, and that it can be made thin.
第１図は本発明による照明装置の一実施例全体の一部を
省略して示した斜視図、第２図は上記実施例の要部断面
図、第３図は従来例の要部断面図である。 １……線状光源、２……導光体、2a……入射端面、2b…
…フレネル形状面、2c……上面、３……反射鏡板、４…
…拡散板。FIG. 1 is a perspective view in which a part of an entire embodiment of a lighting device according to the present invention is omitted, FIG. 2 is a cross-sectional view of an essential part of the above embodiment, and FIG. 3 is a cross-sectional view of an essential part of a conventional example. Is. 1 ... Linear light source, 2 ... Light guide, 2a ... Incident end face, 2b ...
… Fresnel shaped surface, 2c …… Top surface, 3 …… Reflecting mirror plate, 4…
… Diffuser.
Claims (1)
の幅広端面が入射端面として前記線状光源に沿うと共に
底面に前記線状光源の軸方向と平行な多数の溝壁面から
成るフレネル形状面が形成された透明材の導光体と、前
記導光体の下側に配置された反射鏡板と、前記導光体の
上側に配置された拡散板とから成る照明装置において、
前記フレネル形状面の少なくとも前記線状光源側に面し
た各溝壁面の傾きが前記線状光源から遠ざかるにつれて
大となるように構成したことを特徴とする照明装置。1. A Fresnel comprising a linear light source and a plurality of groove wall surfaces each having a wedge-shaped cross-section and having a wide end surface along the linear light source as an incident end surface and having a bottom surface parallel to the axial direction of the linear light source. In a lighting device comprising a light guide body made of a transparent material in which a shaped surface is formed, a reflector plate arranged below the light guide body, and a diffuser plate arranged above the light guide body,
An illumination device, wherein the inclination of each groove wall surface facing at least the linear light source side of the Fresnel-shaped surface becomes larger as the distance from the linear light source increases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62166522A JP2540549B2 (en) | 1987-07-03 | 1987-07-03 | Lighting equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62166522A JP2540549B2 (en) | 1987-07-03 | 1987-07-03 | Lighting equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6411203A JPS6411203A (en) | 1989-01-13 |
| JP2540549B2 true JP2540549B2 (en) | 1996-10-02 |
Family
ID=15832876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62166522A Expired - Lifetime JP2540549B2 (en) | 1987-07-03 | 1987-07-03 | Lighting equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2540549B2 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2527183Y2 (en) * | 1990-11-16 | 1997-02-26 | アルプス電気株式会社 | Light guide for illumination |
| US5339179A (en) * | 1992-10-01 | 1994-08-16 | International Business Machines Corp. | Edge-lit transflective non-emissive display with angled interface means on both sides of light conducting panel |
| US5838403A (en) * | 1996-02-14 | 1998-11-17 | Physical Optics Corporation | Liquid crystal display system with internally reflecting waveguide for backlighting and non-Lambertian diffusing |
| US6072551A (en) * | 1996-02-14 | 2000-06-06 | Physical Optics Corporation | Backlight apparatus for illuminating a display with controlled light output characteristics |
| EP0863422B1 (en) * | 1997-03-04 | 2006-10-04 | Matsushita Electric Industrial Co., Ltd. | Linear beam irradiator |
| JP3763113B2 (en) * | 1997-12-05 | 2006-04-05 | 株式会社エンプラス | Sidelight type surface light source device and liquid crystal display device |
| JP2003141922A (en) * | 2001-10-31 | 2003-05-16 | Asahi Techno Kk | Plane luminous device |
| JP2008262757A (en) * | 2007-04-10 | 2008-10-30 | Nidec Copal Corp | Surface light emitting device |
| JP5280834B2 (en) * | 2008-12-26 | 2013-09-04 | 株式会社ミツバ | Side turn lamps for vehicle door mirrors |
| DE102022210655A1 (en) | 2022-10-10 | 2024-04-11 | Volkswagen Aktiengesellschaft | Lighting element for vehicles |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6134583A (en) * | 1984-07-26 | 1986-02-18 | シャープ株式会社 | Lighting apparatus |
| JPS6273206A (en) * | 1985-09-27 | 1987-04-03 | Hitachi Ltd | Photoconductive plate |
| JPS62284305A (en) * | 1986-06-03 | 1987-12-10 | Alps Electric Co Ltd | Back light leading body |
-
1987
- 1987-07-03 JP JP62166522A patent/JP2540549B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6134583A (en) * | 1984-07-26 | 1986-02-18 | シャープ株式会社 | Lighting apparatus |
| JPS6273206A (en) * | 1985-09-27 | 1987-04-03 | Hitachi Ltd | Photoconductive plate |
| JPS62284305A (en) * | 1986-06-03 | 1987-12-10 | Alps Electric Co Ltd | Back light leading body |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6411203A (en) | 1989-01-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2601766Y2 (en) | Surface emitting device | |
| KR910001084B1 (en) | Light diffuser | |
| US6174064B1 (en) | Light guide panel and plane illuminator apparatus | |
| JP4249631B2 (en) | Backlight unit | |
| US7522809B2 (en) | Planar light source and light guide for use therein | |
| JPH08152625A (en) | Lighting device | |
| US6971782B2 (en) | Illumination device and liquid crystal display device | |
| KR20080061287A (en) | Planar light source apparatus, display apparatus and planar illumination method | |
| JP2540549B2 (en) | Lighting equipment | |
| JP2001184923A (en) | Light source apparatus | |
| JPH0921907A (en) | Prism sheet and illumination device using the same | |
| JPH04104629U (en) | light source device | |
| JP2000231814A (en) | Planar lighting system | |
| JPH02208631A (en) | Surface light emission body device for lighting liquid crystal display element | |
| JPH09292531A (en) | Light transmission plate, optical deflecting plate and surface illuminator | |
| JPH0748093B2 (en) | Surface light source element | |
| JP2006164625A (en) | Luminaire and display device provided with it | |
| JP2003187620A (en) | Planar luminous device and liquid crystal display device equipped with the same | |
| JP3778839B2 (en) | Light guide plate and flat illumination device | |
| KR20010046581A (en) | Backlight device for display | |
| US7434975B2 (en) | Backlight module with brightness enhancing structures and liquid crystal display device incorporating same | |
| JP3549919B2 (en) | Planar light emitting device | |
| JP2006202559A (en) | Surface light source apparatus | |
| JP4360701B2 (en) | Flat lighting device | |
| JP3267847B2 (en) | Light guide plate device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |