JPH05264819A - Plane light source - Google Patents
Plane light sourceInfo
- Publication number
- JPH05264819A JPH05264819A JP4238405A JP23840592A JPH05264819A JP H05264819 A JPH05264819 A JP H05264819A JP 4238405 A JP4238405 A JP 4238405A JP 23840592 A JP23840592 A JP 23840592A JP H05264819 A JPH05264819 A JP H05264819A
- Authority
- JP
- Japan
- Prior art keywords
- light source
- fluorescent tube
- transmission system
- light
- light transmission
- 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
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、薄型の平面光源に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin flat light source.
【０００２】さらに詳しくは、螢光放電管の放射束を集
束する系と導光系からなる平面光源に関する。More specifically, the present invention relates to a flat light source including a system for focusing the radiant flux of a fluorescent discharge tube and a light guide system.
【０００３】[0003]
【従来の技術】白熱電灯各種螢光管を光源とした平面光
源は、図１に示すように、反射板１、拡散板２を用いた
系で構成され、均質輝度を得るためには、拡散板を光源
３から距離を置く必要がある。2. Description of the Related Art A flat light source using various fluorescent tubes of incandescent lamps as a light source is composed of a system using a reflection plate 1 and a diffusion plate 2 as shown in FIG. The plate needs to be spaced from the light source 3.
【０００４】また、省スペースな平面光源としては、Ｅ
Ｌ（エレクトロルミネッセンス）、発光ダイオード、平
型螢光管等が実用に供されている。As a space-saving flat light source, E
L (electroluminescence), a light emitting diode, a flat type fluorescent tube and the like are put to practical use.
【０００５】[0005]
【発明が解決しようとする課題】しかし、従来の平面光
源は、拡散板と光源の間に距離があるために、占有する
空間が大きく、省スペースが要求される表示装置の光源
や広告看板等には不満足な光源であった。However, since the conventional flat light source has a large distance between the diffuser and the light source, it occupies a large space and is required to save space. It was an unsatisfactory light source.
【０００６】また、ＥＬ、発光ダイオード、平型螢光管
等には、発光色が限定される、均質な平面輝度が得られ
ない、発光効率が低いなどの問題があった。Further, ELs, light emitting diodes, flat fluorescent tubes, and the like have problems that the emission color is limited, uniform planar brightness cannot be obtained, and light emission efficiency is low.
【０００７】[0007]
【課題を解決するための手段】本発明は、このような従
来の平面光源の欠点に鑑み発明されたもので、発光効率
が高く白色光が得られる螢光管の光束を厚め、平型の導
光系に導き、導光系は一部の境界面で放射束を反射、あ
るいは透過屈折、あるいは散乱することによって外部に
取り出すことを特徴とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of conventional flat light sources. The light guide system is characterized in that the light guide system takes out the radiant flux to the outside by reflecting, transmitting, refracting, or scattering the radiant flux at some boundary surfaces.
【０００８】[0008]
【作用】本発明は、前記の手段によって、高輝度、均
質、省スペースな平面光源を提供するものである。The present invention provides a high-luminance, uniform, space-saving flat light source by the above means.
【０００９】[0009]
【実施例】以下、実施例を参照しながら本発明を詳説す
る。EXAMPLES The present invention will be described in detail below with reference to examples.
【００１０】実施例１ 図２は、螢光管として、アパーチャー型螢光管を使用し
た場合の見取り図である。アパーチャー型螢光管４は、
図３（ａ）の断面図に示すようにガラス壁８に反射膜
９、螢光体層１０を塗布し、アパーチャー部５には何も
塗布しない構造、もしくは類似の構造を有している。し
たがってアパーチャー部５は通常の螢光管の数倍の光束
発散度を得ている。言い替えると、螢光管の光束を集
め、アパーチャー部から放射していることに他ならな
い。このように集光された光束は、くさび状の導光系６
に導かれる。導光系６の入射端面はアパーチャー部に近
接して設置され、光束を無駄なく導ける構造になってい
る。Embodiment 1 FIG. 2 is a sketch drawing when an aperture type fluorescent tube is used as the fluorescent tube. The aperture type fluorescent tube 4 is
As shown in the cross-sectional view of FIG. 3A, the glass wall 8 is coated with the reflective film 9 and the phosphor layer 10 and the aperture portion 5 is coated with nothing or a similar structure. Therefore, the aperture section 5 has a luminous flux divergence several times that of an ordinary fluorescent tube. In other words, it is nothing but collecting the luminous flux of the fluorescent tube and radiating it from the aperture part. The light flux thus condensed is used as a wedge-shaped light guide system 6
Be led to. The incident end face of the light guide system 6 is installed in the vicinity of the aperture portion, and has a structure capable of guiding the light flux without waste.
【００１１】この例では、そのために透明樹脂１１で密
着させている。また導光系は、光吸収が少ない屈折率が
空気より大きい透明材料ならば使用できるが、ここでは
透明性と加工性から透明無色のアクリル樹脂を使用し
た。アクリル樹脂（導光系）は、図２、図３のように、
くさび形に形成され、さらに反射面７を図３（ｂ）に示
す鋸状断面や、同じく（ｃ）に示す散乱面に加工され
る。これは入射光束１３が導光系の平面部１４から垂直
な方向に多く放射されるようにするためである。アクリ
ル樹脂（導光系）の反射面７は、さらに反射性膜１２
（金属の蒸着膜、白色顔料被膜等）を被覆され、光束の
損失を防止した構造になっている。同様な被覆は、平面
部１４以外の導光系壁に設置してもよい。また、導光系
は、平面部位外からの光束のもれを防ぐために、反射面
以外の平面は平坦に仕上げることが肝要である。In this example, the transparent resin 11 is used for this purpose. The light guide system may be made of a transparent material having a small light absorption and a refractive index larger than that of air, but a transparent colorless acrylic resin is used here because of its transparency and processability. Acrylic resin (light guide system), as shown in FIGS. 2 and 3,
It is formed in a wedge shape, and the reflecting surface 7 is further processed into a sawtooth section shown in FIG. 3B or a scattering surface shown in FIG. 3C. This is so that the incident light flux 13 is largely radiated from the flat surface portion 14 of the light guide system in the vertical direction. The reflective surface 7 of acrylic resin (light guide system) is further provided with a reflective film 12.
It is coated with (a metal vapor deposition film, a white pigment film, etc.) to prevent the loss of luminous flux. A similar coating may be installed on the light guide system wall other than the flat portion 14. Further, in the light guide system, in order to prevent the leakage of the light flux from the outside of the flat portion, it is important to finish the flat surfaces other than the reflecting surface to be flat.
【００１２】４Ｗの小型アパーチャー型螢光管、アクリ
ル導光系を用いた有効面積４０ｃｍ2 の平面部１４にお
いて、平面部の輝度が２０００ｃｄ／ｍ2 以上を得た。
これは従来の反射板＋拡散板に匹敵する値である。In the flat portion 14 having an effective area of 40 cm 2 using a 4 W small aperture type fluorescent tube and an acrylic light guide system, the brightness of the flat portion was 2000 cd / m 2 or more.
This is a value comparable to the conventional reflector + diffuser.
【００１３】実施例２ 実施例２は、螢光管として反射形螢光管を使用し、実施
例１と同じ導光系により平面光源を得たものである。そ
こで簡単に、実施例２で用いた反射型螢光管の説明を加
える。Example 2 In Example 2, a reflection type fluorescent tube was used as the fluorescent tube, and a flat light source was obtained by the same light guiding system as in Example 1. Therefore, a brief description of the reflection type fluorescent tube used in Example 2 will be added.
【００１４】図４は実施例２の断面図である。反射型螢
光管１５は、ガラス壁８に一部を除いて反射膜９が塗
付、焼成され、次に螢光体層１０が全管内に塗付、焼成
されている。反射型螢光管について詳しくは、特許公報
昭４９−４５５１０，昭５０−８８６１を参照された
い。FIG. 4 is a sectional view of the second embodiment. In the reflection type fluorescent tube 15, the reflection film 9 is applied to the glass wall 8 except for a part thereof and baked, and then the fluorescent layer 10 is applied to the entire tube and baked. For details of the reflection type fluorescent tube, see Japanese Patent Publication Nos. 49-45510 and 50-8861.
【００１５】この反射型螢光管を用いた系では、可視光
ではなく、紫外線を有効に発光部１６に集める点が、実
施例１と異なっている。この実施例２の場合も、実施例
１と同程度の平面部の輝度を得ている。The system using this reflection type fluorescent tube is different from Example 1 in that not the visible light but the ultraviolet rays are effectively collected in the light emitting section 16. Also in the case of the second embodiment, the brightness of the plane portion is similar to that of the first embodiment.
【００１６】実施例３ 実施例３は、螢光管として特殊な発光部を持たない一般
型を用いた場合である。Example 3 Example 3 is a case where a general type having no special light emitting portion is used as a fluorescent tube.
【００１７】図５の断面図に示すように、螢光管１７は
反射板１８によって周囲を取り囲まれ、導光系に近接す
る一部の反射板が開口している。螢光管１７から出た光
束は、反射板１８により開口部１９に集光される。しか
しこの時、反射板１８からの反射光の一部は再び螢光管
に戻り吸収される。このため実施例１のアパ−チヤ−形
螢光管や、実施例２の反射型螢光管に比べ効率の低下が
見られる。しかるに開口部１９の光束発散度は明らかに
大きくなる。こうして導光系に集められた光束は、実施
例１と同じく発散し、平面光源となる。As shown in the sectional view of FIG. 5, the fluorescent tube 17 is surrounded by a reflector plate 18, and a part of the reflector plate close to the light guide system is opened. The light flux emitted from the fluorescent tube 17 is focused on the opening 19 by the reflector 18. However, at this time, part of the reflected light from the reflector 18 returns to the fluorescent tube and is absorbed. Therefore, the efficiency is lower than that of the aperture type fluorescent tube of Example 1 and the reflection type fluorescent tube of Example 2. However, the luminous flux divergence of the opening 19 is obviously increased. The light flux collected in the light guide system in this way diverges in the same way as in Example 1, and becomes a flat light source.
【００１８】実施例４ 実施例１から３は、直管タイプの螢光管であったが、本
発明は螢光管の形状については自由に対応できる。その
一例として、実施例４はＵ字型の螢光管の場合である。
一般に、螢光管はある程度管長が長くないと効率が低下
する。したがって、Ｕ字型管は効率の点からも、直管に
比べ有利である。Embodiment 4 Although Embodiments 1 to 3 are straight tube type fluorescent tubes, the present invention can freely deal with the shape of the fluorescent tube. As an example, the fourth embodiment is a case of a U-shaped fluorescent tube.
Generally, the efficiency of a fluorescent tube decreases unless the tube length is long to some extent. Therefore, the U-shaped tube is also advantageous over the straight tube in terms of efficiency.
【００１９】実施例１〜３で挙げたいずれの集光方法を
採用しても、Ｕ字管にも適用されるが、ここではアパ−
チヤ−型Ｕ字螢光管の例を挙げる。図６はその見取図、
図７は断面図である。Although any of the light collecting methods described in Embodiments 1 to 3 can be applied to a U-shaped tube, the aperture is used here.
An example of a U-shaped fluorescent tube will be given. Figure 6 shows the sketch,
FIG. 7 is a sectional view.
【００２０】アパーチャー型螢光管４は開口部５を有
し、開口部５に合わせて導光系６の入射端面が近接して
配置されている。導光系６は透明なアクリル樹脂から成
り、中央部が薄いくさびが向かいあった形状をしてい
る。反射面等の処置は、実施例１と同様に行なってい
る。The aperture type fluorescent tube 4 has an opening 5, and the incident end face of the light guide system 6 is arranged close to the opening 5. The light guide system 6 is made of a transparent acrylic resin, and has a shape in which thin wedges face each other in the central portion. The treatment of the reflecting surface and the like is performed in the same manner as in the first embodiment.
【００２１】実施例１から４は、いずれも導光系からの
光を出射する方向を、平坦な面で説明したが、図８のよ
うに反対側の面で行なってもよい。この場合は、入射光
束１３を透過出射面２０から外部に取出す構造となる。
透過出射面２０は、図３（ｂ）、（ｃ）に示す鋸状断
面、散乱面となっている。また、反対の平面や他の端面
には、必要に応じ反射性の被覆を施してある。In each of the first to fourth embodiments, the direction in which the light from the light guide system is emitted is described as a flat surface, but it may be performed on the opposite surface as shown in FIG. In this case, the structure is such that the incident light flux 13 is extracted from the transmission / emission surface 20 to the outside.
The transmission / emission surface 20 has a sawtooth cross section and a scattering surface shown in FIGS. 3B and 3C. The opposite flat surface and the other end surface are coated with a reflective material, if necessary.
【００２２】以上、実施例を挙げて本発明を説明した。The present invention has been described with reference to the embodiments.
【００２３】[0023]
【発明の効果】このように本発明によると、螢光管を光
源とし、導光系を用いることによって、白色、高発光効
率、薄型、均質な輝度を持つ平面光源が実現される。As described above, according to the present invention, by using a fluorescent tube as a light source and a light guide system, a planar light source having white, high luminous efficiency, thin shape and uniform brightness can be realized.
【００２４】本発明は、省スペースを要求される分野、
ポータブルな表示装置の背面光源、表示機器の分野に特
に有効である。The present invention is a field requiring space saving,
It is particularly effective in the field of back light sources of portable display devices and display devices.
【図１】 反射板、拡散板を用いた従来の例を示す切欠
き見取図である。FIG. 1 is a cutaway sketch showing a conventional example using a reflection plate and a diffusion plate.
【図２】 本発明によるアパーチャー型螢光管を用いた
場合の見取図である。FIG. 2 is a sketch drawing when an aperture type fluorescent tube according to the present invention is used.
【図３】 図２の場合の断面図である。（ａ）は、全体
の断面、（ｂ）、（ｃ）は反射面の断面を示すものであ
る。FIG. 3 is a sectional view in the case of FIG. (A) shows the entire cross section, and (b) and (c) show the cross section of the reflecting surface.
【図４】 反射型螢光管を用いた場合の断面図である。FIG. 4 is a cross-sectional view when a reflection type fluorescent tube is used.
【図５】 通常の螢光管と反射板を用いた場合の断面図
である。FIG. 5 is a cross-sectional view in the case where a normal fluorescent tube and a reflector are used.
【図６】 アパーチャー型Ｕ字螢光管を用いた場合の見
取図である。FIG. 6 is a sketch drawing when an aperture type U-shaped fluorescent tube is used.
【図７】 図６の断面図である。7 is a cross-sectional view of FIG.
【図８】 出射面を反対にした導光系の断面図である。FIG. 8 is a cross-sectional view of a light guide system with its emission surface opposite.
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【手続補正書】[Procedure amendment]
【提出日】平成４年１０月７日[Submission date] October 7, 1992
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】特許請求の範囲[Name of item to be amended] Claims
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【特許請求の範囲】[Claims]
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００２[Name of item to be corrected] 0002
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００２】さらに詳しくは、螢光放電管を備え、蛍光
放電管の放射束を集束する手段を有する光源部と、平面
形状の導光系からなる平面光源に関する。More specifically, a fluorescent discharge tube is provided to
A light source unit having means for focusing the radiant flux of the discharge tube;
The present invention relates to a flat light source including a light guide system having a shape .
【手続補正３】[Procedure 3]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００７[Correction target item name] 0007
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００７】[0007]
【課題を解決するための手段】本発明は、このような従
来の平面光源の欠点に鑑み発明されたもので、発光効率
が高く白色光が得られる螢光管の光束を集束し、平型の
導光系に導き、導光系は一部の境界面で放射束を反射、
あるいは透過屈折、あるいは散乱することによって外部
に取り出すことを特徴とする。Means for Solving the Problems The present invention is such one that is in view of the shortcomings of conventional planar light source invention, it focuses the light beam of the fluorescent tube high emission efficiency white light is obtained, flat The light guide system reflects the radiant flux at some boundary surfaces,
Alternatively, it is characterized in that it is taken out to the outside by transmission refraction or scattering.
Claims (4)
おいて、螢光放電管の放射束を集束し、屈折率が空気よ
り大きい平型の導光系に導き、導光系は一部の境界面で
放射束を反射、あるいは透過屈折、あるいは散乱するこ
とによって外部に取り出すことを特徴とする平面光源。1. In a flat light source using a fluorescent discharge tube as a light source, a radiant flux of the fluorescent discharge tube is converged and guided to a flat light guide system having a refractive index larger than air, and the light guide system is a part of the light guide system. A flat light source characterized by extracting the radiant flux to the outside by reflecting, transmitting refracting, or scattering the radiant flux at the boundary surface.
ャー型螢光管を用いることを特徴とする請求項１記載の
平面光源。2. The flat light source according to claim 1, wherein an aperture type fluorescent tube is used as a light source forming the flat light source.
光管を用いることを特徴とする請求項１記載の平面光
源。3. The flat light source according to claim 1, wherein a reflection type fluorescent tube is used as a light source constituting the flat light source.
包囲する反射板を用いることを特徴とする請求項１記載
の平面光源。4. The flat light source according to claim 1, wherein a reflecting plate surrounding the fluorescent tube is used as a light source forming the flat light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4238405A JPH05264819A (en) | 1992-09-07 | 1992-09-07 | Plane light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4238405A JPH05264819A (en) | 1992-09-07 | 1992-09-07 | Plane light source |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58016535A Division JPS59143202A (en) | 1983-02-03 | 1983-02-03 | Plane light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05264819A true JPH05264819A (en) | 1993-10-15 |
Family
ID=17029719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4238405A Pending JPH05264819A (en) | 1992-09-07 | 1992-09-07 | Plane light source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05264819A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006114379A (en) * | 2004-10-15 | 2006-04-27 | Toppan Printing Co Ltd | Illumination device |
| US7280172B2 (en) | 2001-08-01 | 2007-10-09 | Samsung Electronics Co., Ltd. | Light guide plate, liquid crystal display device having the same, and method for displaying an image using the liquid crystal display device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5135582A (en) * | 1974-09-21 | 1976-03-26 | Murayama Takaharu | MENHATSUKOTAI |
| JPS5188042A (en) * | 1975-01-30 | 1976-08-02 |
-
1992
- 1992-09-07 JP JP4238405A patent/JPH05264819A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5135582A (en) * | 1974-09-21 | 1976-03-26 | Murayama Takaharu | MENHATSUKOTAI |
| JPS5188042A (en) * | 1975-01-30 | 1976-08-02 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7280172B2 (en) | 2001-08-01 | 2007-10-09 | Samsung Electronics Co., Ltd. | Light guide plate, liquid crystal display device having the same, and method for displaying an image using the liquid crystal display device |
| JP2006114379A (en) * | 2004-10-15 | 2006-04-27 | Toppan Printing Co Ltd | Illumination device |
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