JP2731221B2 - Surface lighting device - Google Patents
Surface lighting deviceInfo
- Publication number
- JP2731221B2 JP2731221B2 JP1068888A JP6888889A JP2731221B2 JP 2731221 B2 JP2731221 B2 JP 2731221B2 JP 1068888 A JP1068888 A JP 1068888A JP 6888889 A JP6888889 A JP 6888889A JP 2731221 B2 JP2731221 B2 JP 2731221B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- light guide
- incident
- guide plate
- lamp
- 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)
- Illuminated Signs And Luminous Advertising (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
【発明の詳細な説明】 [産業上の利用分野] 本発明は、電飾サインや誘導表示灯等に用いられ、透
光性を有する表示体を背面側から照明する面照明装置に
関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface illuminating device that is used for an electric sign, a guidance display lamp, and the like, and illuminates a translucent display body from the back side. .
[従来の技術] 従来の誘導表示灯を第6図に示す。この誘導表示灯は
本体5内に収納されたランプ1の光を反射板7を用いて
反射して表示体6に照射し、本体5の開口された両側面
に取着された透光性を有する表示体6を照明するもので
ある。[Prior Art] FIG. 6 shows a conventional guidance indicator. The guide indicator light reflects the light of the lamp 1 housed in the main body 5 by using the reflection plate 7 and irradiates the light to the display body 6, so that the light transmitting property attached to both open side surfaces of the main body 5 is improved. This is for illuminating the display body 6.
ところが、このような従来の誘導表示灯では、表示体
6の表示面の輝度を均一にするために、ランプ1と表示
体6との距離をある程度とる必要がある。従って、器具
の厚みが厚くなる問題があった。However, in such a conventional guide indicator lamp, it is necessary to keep a certain distance between the lamp 1 and the display unit 6 in order to make the luminance of the display surface of the display unit 6 uniform. Therefore, there was a problem that the thickness of the device was increased.
そこで、上記点を解消するために、第7図(a)に示
すエッジライト方式の面照明装置が提案されている。こ
の面照明装置は透明材料で形成された導光体2を用いて
間接的に表示体6を照明するもので、第7図(a)に示
すように直方体状の導光体2を本体5内に収納すると共
に、ランプ1を導光体2の下端面に沿うように配設し、
導光体2の下端面から入射されるランプ1の光を導光体
2の上端面側に導光すると共に、拡散処理が施された導
光体2の背面で入射光を拡散することにより、導光体2
の全体を略均一に発光させ、導光体2の前面から出射さ
れる光で表示体6を均一に照明するものである。In order to solve the above problem, an edge light type surface illumination device shown in FIG. 7A has been proposed. This surface lighting device indirectly illuminates the display 6 using the light guide 2 formed of a transparent material, and as shown in FIG. And the lamp 1 is disposed along the lower end surface of the light guide 2,
The light from the lamp 1 incident from the lower end surface of the light guide 2 is guided to the upper end surface side of the light guide 2 and the incident light is diffused on the back surface of the light guide 2 subjected to the diffusion processing. , Light guide 2
Are substantially uniformly emitted, and the display 6 is uniformly illuminated with light emitted from the front surface of the light guide 2.
[発明が解決しようとする課題] しかしながら、このようなエッジライト方式の面照明
装置を用いても、器具の厚みを薄くするにはある程度の
限界がある。つまり、上記エッジライト方式の面照明装
置では均一照明する表示体6の面積に応じて導光体2の
厚みを薄くすることに限界があるため、第7図(b)に
示すように表示体6が両側にある場合、夫々の表示体6
を照明するために夫々導光板2を必要とし、片側だけに
表示体6を備えるものに比べて器具の厚みがほぼ2倍に
なるという問題があった。[Problem to be Solved by the Invention] However, even if such an edge light type surface illumination device is used, there is a certain limit in reducing the thickness of the fixture. That is, in the edge light type surface illuminating device, there is a limit in reducing the thickness of the light guide 2 according to the area of the display body 6 that uniformly illuminates, and therefore, as shown in FIG. If there are 6 on each side, each display 6
In order to illuminate the light source, the light guide plate 2 is required, and there is a problem that the thickness of the device is almost double as compared with the case where the display body 6 is provided only on one side.
本発明は上述の点に鑑みて為されたものであり、その
目的とするところは、両側に表示体を備える器具に用い
ても、器具の厚みを薄くすることができる面照明装置を
提供することにある。The present invention has been made in view of the above points, and an object of the present invention is to provide a surface illumination device that can reduce the thickness of an appliance even when used in an appliance having a display body on both sides. It is in.
[課題を解決するための手段] 上記目的を達成するために、本発明は入射面である一
端面から入射される光をこの入射端面と反対側に導光し
ながら拡散して全体が均一に発光し、入射面に隣接する
一端面である出射面から光を出射する複数枚の薄板状の
導光板を、入射面の向きを一致させると共に、互いに隣
接する導光板の出射面の向きを交互に反対にして積層し
て形成された導光体と、導光体の積層方向に長手方向を
一致させて導光板の入射面が列設された面に並設された
線状光源とを備えている。[Means for Solving the Problems] In order to achieve the above object, the present invention diffuses light incident from one end face which is an incident face while guiding the light to the opposite side to the incident end face to uniformly diffuse the light. A plurality of thin light guide plates that emit light and emit light from an emission surface that is one end surface adjacent to the incidence surface are made to have the same orientation of the incidence surfaces and alternately the orientations of the emission surfaces of the light guide plates adjacent to each other. A light guide formed by stacking the light guides opposite to each other, and a linear light source arranged in parallel with the surface on which the light-incident surface of the light guide plate is aligned in the longitudinal direction in the stacking direction of the light guides. ing.
[作用] 本発明は、上述のように入射面である一端面から入射
される光をこの入射端面と反対側に導光しながら拡散し
て全体が均一に発光し、入射面に隣接する一端面である
出射面から光を出射する複数板の薄板状の導光板を、入
射面の向きを一致させると共に、互いに隣接する導光板
の出射面の向きを交互に反対にして積層して導光体を形
成することにより、夫々の導光板に関してはランプの径
とほぼ同じ厚みでも夫々の導光板の出射面からは均一な
光を出射できる厚みが得られるようにして、導光体の厚
みがランプの径とほぼ同じ厚みでも済むようにしたもの
である。[Operation] As described above, according to the present invention, the light incident from one end surface, which is the incident surface, is diffused while being guided to the side opposite to the incident end surface, and the light is uniformly emitted as a whole. A light guide is formed by stacking a plurality of thin light guide plates that emit light from an exit surface, which is an end surface, with the directions of the incident surfaces coincided and the directions of the exit surfaces of the adjacent light guide plates are alternately reversed. By forming the body, the thickness of the light guide plate is increased so that a uniform light can be emitted from the emission surface of each light guide plate even with a thickness substantially equal to the diameter of the lamp. The thickness is almost the same as the diameter of the lamp.
[実施例] 本実施例では、導光体2を第3図に示すように薄板状
の導光板4を複数枚積層して形成してある。Example In the present example, the light guide 2 is formed by laminating a plurality of thin light guide plates 4 as shown in FIG.
導光板4は、第2図及び第4図に示すように、側方か
ら見て略直角三角形で、各面を前面4cを除いて平滑面に
形成すると共に、前面4cを例えばフロスト加工を施して
拡散透過面に形成してある。この導光板4では、下面4a
を入射面とし、前面4cを出射面として用いるようにして
ある。また、この導光板4はガラスやプラスチック等の
ように屈折率が1.4〜1.6の透明材料で形成されており、
下面4aから入射される光は平滑面で全反射されるように
してある。ここで、上記導光板4の背面4bは下面4aから
の入射光を前面4cに均一に反射する曲率の曲面に形成し
てある。なお、この背面4bには反射板を密接して取り付
けても良いし、あるいはアルミを蒸着して、この背面4b
を完全な全反射面にしても良い。また、本実施例の導光
板4は上端面4dを有するが、この上端面4dの無い尖った
形状であっても良い。As shown in FIGS. 2 and 4, the light guide plate 4 is a substantially right triangle when viewed from the side, and each surface is formed as a smooth surface except for the front surface 4c, and the front surface 4c is subjected to, for example, frost processing. Formed on the diffuse transmission surface. In this light guide plate 4, the lower surface 4a
Is used as an entrance surface, and the front surface 4c is used as an exit surface. The light guide plate 4 is made of a transparent material having a refractive index of 1.4 to 1.6, such as glass or plastic.
Light incident from the lower surface 4a is totally reflected by a smooth surface. Here, the back surface 4b of the light guide plate 4 is formed into a curved surface having a curvature that uniformly reflects incident light from the lower surface 4a to the front surface 4c. It should be noted that a reflection plate may be closely attached to the back surface 4b, or aluminum may be vapor-deposited on the back surface 4b.
May be a perfect total reflection surface. Although the light guide plate 4 of the present embodiment has the upper end surface 4d, the light guide plate 4 may have a sharp shape without the upper end surface 4d.
導光体2は、第3図に示すように、下面4aの向きを一
致させると共に、互いに隣接する導光板4の前面4cの向
きを交互に反対にして複数枚の導光板4を積層して形成
してある。なお、導光板4は接着によって積層しても良
いし、または単に機械的に接合して積層しても良い。As shown in FIG. 3, the light guide 2 is formed by stacking a plurality of light guide plates 4 with the directions of the lower surfaces 4a coincided with each other and the directions of the front surfaces 4c of the adjacent light guide plates 4 are alternately reversed. It is formed. The light guide plate 4 may be laminated by bonding, or may be simply mechanically bonded and laminated.
上記導光板2は第1図に示すように両側の開口に表示
体6が取着された本体5内に収納し、この導光体2の積
層方向に長手方向を一致させて導光板2の下面4aが列設
された面に並設する形で直管状のランプ1を本体5内に
収納する。ここで、上記表示体6には拡散処理を施して
あり、導光板2からの光を拡散するようにしてある。な
お、表示体6と導光板2との間に拡散板を配設しても良
い。このように本実施例では複数枚の導光板4で導光体
2を構成し、互いに隣接する導光板4の前面4cの向きを
交互に反対にして複数枚の導光板4を積層してあるの
で、夫々の導光板4に関してはランプ1の径とほぼ同じ
厚みD′であっても各前面4cから均一な光を発すること
ができ、このため両側に表示体を備える器具に用いて
も、導光体2の厚みD(=D′)をランプ1の径とほぼ
同じ厚みにすることが可能となり、器具の薄型化が図れ
る。しかも、導光板4の前面4cの向きを一方向に一致さ
せれば、片側だけに表示体を備える器具の面照明装置と
することもできる。さらに、複数枚の導光板4を積層し
て導光体2を形成してあるので、ランプ1の長手方向に
長さの異なる各種形状の表示体であっても、導光板4を
積層する枚数を変えることで、その表示体に応じた導光
体2を容易に形成することができる。As shown in FIG. 1, the light guide plate 2 is housed in a main body 5 in which a display body 6 is attached to openings on both sides, and the longitudinal direction of the light guide plate 2 is aligned with the lamination direction of the light guide plate 2. The straight tubular lamp 1 is housed in the main body 5 in such a manner that the lower surfaces 4a are arranged side by side on the side where the rows are arranged. Here, the display body 6 has been subjected to a diffusion process to diffuse light from the light guide plate 2. Note that a diffusion plate may be provided between the display 6 and the light guide plate 2. As described above, in this embodiment, the light guide 2 is constituted by the plurality of light guide plates 4, and the plurality of light guide plates 4 are stacked with the front surfaces 4 c of the light guide plates 4 adjacent to each other being alternately reversed. Therefore, with respect to each light guide plate 4, even if the thickness D 'is almost the same as the diameter of the lamp 1, uniform light can be emitted from each front face 4c. The thickness D (= D ') of the light guide 2 can be made substantially the same as the diameter of the lamp 1, and the thickness of the device can be reduced. Moreover, if the direction of the front surface 4c of the light guide plate 4 is made to coincide with one direction, it is possible to provide a surface illumination device for an appliance having a display body only on one side. Furthermore, since the light guide 2 is formed by laminating a plurality of light guide plates 4, the number of light guide plates 4 to be stacked can be varied even in the case of variously shaped displays having different lengths in the longitudinal direction of the lamp 1. , The light guide 2 corresponding to the display can be easily formed.
さらに、導光板4としては第5図(a)〜(c)に示
すものを用いても良い。Further, as the light guide plate 4, the one shown in FIGS. 5 (a) to 5 (c) may be used.
第5図(a)の導光板8は第2図の導光板4の前面4c
と背面4bとを逆さにした形状で、背面8bを除いて平滑面
にしてあり、背面8bは例えば外面に白色塗装を施して拡
散反射面としてある。この導光板8では、下面8aを入射
面とし、曲面となった前面8cを出射面として用いる。こ
こで、前面8cは、導光板4の背面4bと同様に、下面8aか
らの入射光を背面8bに均一に反射する曲率の曲面に形成
して、下面8aから入射される光を背面8b側に導く反射面
としても機能する。なお、この導光板8を用いる場合に
は前面8cの前方に拡散板9を配置する。The light guide plate 8 in FIG. 5A is a front surface 4c of the light guide plate 4 in FIG.
The rear surface 8b has a shape in which the rear surface 4b is inverted and has a smooth surface except for the rear surface 8b. The rear surface 8b is, for example, a white paint applied to the outer surface to be a diffuse reflection surface. In the light guide plate 8, the lower surface 8a is used as an incident surface, and the curved front surface 8c is used as an output surface. Here, similarly to the rear surface 4b of the light guide plate 4, the front surface 8c is formed into a curved surface having a curvature that uniformly reflects the incident light from the lower surface 8a to the rear surface 8b, and the light incident from the lower surface 8a is formed on the rear surface 8b side. It also functions as a reflection surface that leads to light. When the light guide plate 8 is used, the diffusion plate 9 is arranged in front of the front surface 8c.
この導光板8では、下面8aから入射されたランプ1の
光が前面8c等の全反射によって上面8d側に導かれると共
に、拡散反射面である背面8bでランプ1からの直射光及
び前面8c等からの反射光が拡散され、導光板8は均一に
発光する。そして、上記背面8bで拡散反射された光の内
で前面8cの臨界角以下の光が前面8cを透過して拡散板9
に至り、拡散板9で前面8cからの光を拡散して均一な光
を得る。In the light guide plate 8, the light of the lamp 1 incident from the lower surface 8a is guided to the upper surface 8d by total reflection of the front surface 8c and the like, and the direct light from the lamp 1 and the front surface 8c and the like are reflected on the rear surface 8b which is a diffuse reflection surface. The light reflected from the light guide plate 8 is diffused, and the light guide plate 8 emits light uniformly. Then, of the light diffusely reflected by the back surface 8b, light having a critical angle equal to or less than the critical angle of the front surface 8c is transmitted through the front surface 8c and diffused.
The light from the front surface 8c is diffused by the diffusion plate 9 to obtain uniform light.
第5図(b)の導光板10は透明材料で直方体形状の薄
板に形成されたもので、各面は平滑面に形成してある。
この導光板10では、内部にランプ1の光を拡散する拡散
剤としての乳白剤11を混入してあり、この乳白剤11はラ
ンプ1の光が入射される下面10aから反対側の上面10dに
行く程に混入量を多くして、上面10d側に行く程に拡散
性を高くしてある。この導光板10も前面10cを出射面と
して用いる。なお、背面10bにアルミ蒸着等の反射処理
を施しても良い。この導光板10によっても下面10aから
入射されたランプ1の光を各面の反射によって上面10d
側に導光し、乳白剤11によって上記光を拡散して導光板
10を均一に発光させ、前面10cから均一な光が得られ
る。The light guide plate 10 in FIG. 5 (b) is made of a transparent material and formed in a rectangular parallelepiped thin plate, and each surface is formed as a smooth surface.
In the light guide plate 10, an opacifying agent 11 as a diffusing agent for diffusing the light of the lamp 1 is mixed therein, and the opacifying agent 11 is transferred from the lower surface 10a where the light of the lamp 1 is incident to the upper surface 10d on the opposite side. The mixing amount increases as the distance increases, and the diffusivity increases as the distance increases toward the upper surface 10d. The light guide plate 10 also uses the front surface 10c as an emission surface. The back surface 10b may be subjected to a reflection treatment such as aluminum evaporation. This light guide plate 10 also allows the light of the lamp 1 incident from the lower surface 10a to be reflected by the respective surfaces so that the upper surface 10d.
The light guide plate is guided to the side, and the light is diffused by the opacifier 11.
10 is made to emit light uniformly, and uniform light is obtained from the front surface 10c.
第5図(c)の導光板12は第2図の導光板4と略同一
の形状のもので、この導光板12では背面12bをフレネル
状に加工してある点が導光板4と異なる。なお、背面12
bにはアルミ蒸着などにより反射処理を施して光の拡散
性を高くしてある。The light guide plate 12 shown in FIG. 5C has substantially the same shape as the light guide plate 4 shown in FIG. 2. The light guide plate 12 differs from the light guide plate 4 in that the rear surface 12b is processed into a Fresnel shape. The back 12
b is subjected to a reflection treatment by aluminum evaporation or the like to increase the light diffusivity.
[発明の効果] 本発明は上述のように、入射面である一端面から入射
される光をこの入射端面と反対側に導光しながら拡散し
て全体が均一に発光し、入射面に隣接する一端面である
出射面から光を出射する複数枚の薄板状の導光板を、入
射面の向きを一致させると共に、互いに隣接する導光板
の出射面の向きを交互に反対にして積層して導光体を形
成してあるので、夫々の導光板に関してはランプなどの
光源の径とほぼ同じ厚みでも出射面を均一に発光させる
ことができる厚みが得られ、導光体の厚みを光源の径と
ほぼ同じ厚みとすることができ、器具の薄型化が図れる
効果がある。[Effects of the Invention] As described above, according to the present invention, light incident from one end surface which is an incident surface is diffused while being guided to the opposite side to the incident end surface to emit light uniformly as a whole, and is adjacent to the incident surface. A plurality of thin plate-shaped light guide plates that emit light from the emission surface that is one end surface are made to accumulate while aligning the directions of the incidence surfaces and alternately stacking the directions of the emission surfaces of the light guide plates adjacent to each other. Since the light guides are formed, the thickness of the light guide plate is such that the light emission surface can be uniformly illuminated even with a thickness substantially equal to the diameter of the light source such as a lamp. The thickness can be made substantially the same as the diameter, which has the effect of reducing the thickness of the device.
第1図は本発明の一実施例の断面図、第2図は同上の導
光板の斜視図、第3図は同上の導光体の斜視図、第4図
は導光板の発光状態の説明図、第5図(a)〜(c)は
夫々別形状の導光板の説明図、第6図は従来例の断面
図、第7図(a),(b)は表示体を片側あるいは両側
に備える別の従来例の断面図である。 1はランプ、2は導光体、4,8,10,12は導光板、4a,8a,1
0a,12aは下面、4c,8c,10c,12cは前面である。FIG. 1 is a cross-sectional view of one embodiment of the present invention, FIG. 2 is a perspective view of the above light guide plate, FIG. 3 is a perspective view of the above light guide, and FIG. FIGS. 5 (a) to 5 (c) are explanatory views of light guide plates having different shapes, FIG. 6 is a cross-sectional view of a conventional example, and FIGS. 7 (a) and 7 (b) show a display body on one side or both sides. It is sectional drawing of another conventional example provided with. 1 is a lamp, 2 is a light guide, 4, 8, 10, 12 are light guide plates, 4a, 8a, 1
0a and 12a are lower surfaces, and 4c, 8c, 10c and 12c are front surfaces.
Claims (1)
の入射端面と反対側に導光しながら拡散して全体が均一
に発光し、入射面に隣接する一端面である出射面から光
を出射する複数枚の薄板状の導光板を、入射面の向きを
一致させると共に、互いに隣接する導光板の出射面の向
きを交互に反対にして積層して形成された導光体と、導
光体の積層方向に長手方向を一致させて導光板の入射面
が列設された面に並設された線状光源とを備えた面照明
装置。1. A light incident from one end surface, which is an incident surface, is diffused while being guided to a side opposite to the incident end surface to uniformly emit light as a whole, and from an exit surface, which is one end surface adjacent to the incident surface. A light guide formed by laminating a plurality of thin light guide plates that emit light, matching the directions of the incident surfaces and alternately stacking the directions of the emission surfaces of the adjacent light guide plates, A surface illumination device comprising: a linear light source in which the longitudinal direction is aligned with the laminating direction of the light guides and the light incident surface of the light guide plate is arranged side by side.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1068888A JP2731221B2 (en) | 1989-03-20 | 1989-03-20 | Surface lighting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1068888A JP2731221B2 (en) | 1989-03-20 | 1989-03-20 | Surface lighting device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH02247685A JPH02247685A (en) | 1990-10-03 |
JP2731221B2 true JP2731221B2 (en) | 1998-03-25 |
Family
ID=13386644
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1068888A Expired - Fee Related JP2731221B2 (en) | 1989-03-20 | 1989-03-20 | Surface lighting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2731221B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100109576A1 (en) * | 2007-03-29 | 2010-05-06 | Koninklijke Philips Electronics N.V. | General illumination system and an illuminaire |
-
1989
- 1989-03-20 JP JP1068888A patent/JP2731221B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH02247685A (en) | 1990-10-03 |
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