JPH0979872A - Light guide plate for transmission lighting system - Google Patents
Light guide plate for transmission lighting systemInfo
- Publication number
- JPH0979872A JPH0979872A JP23154995A JP23154995A JPH0979872A JP H0979872 A JPH0979872 A JP H0979872A JP 23154995 A JP23154995 A JP 23154995A JP 23154995 A JP23154995 A JP 23154995A JP H0979872 A JPH0979872 A JP H0979872A
- Authority
- JP
- Japan
- Prior art keywords
- light
- guide plate
- light guide
- display means
- wall 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.)
- Pending
Links
Landscapes
- Details Of Measuring Devices (AREA)
- Details Of Measuring And Other Instruments (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、所定の開口部に表
示を行うべく光源からの光を導く光導板を備え、光源か
らの光を光導板の厚み方向に反射させる反射構造を備え
た透過照明装置の光導板に関するものであって、特に、
計器類における表示を良好に行うことができるように改
良された透過照明装置の光導板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention includes a light guide plate for guiding light from a light source to display in a predetermined opening, and a transmission structure having a reflecting structure for reflecting light from the light source in the thickness direction of the light guide plate. The present invention relates to a light guide plate of a lighting device,
The present invention relates to a light guide plate of a transillumination device which is improved so that a display on an instrument can be performed well.
【0002】[0002]
【従来の技術】従来より照明によって各種の表示を行う
装置が各方面に多様されている。この種の表示装置とし
て、機械装置の計器類や車両等の計器類がある。この計
器類は、使用目的、使用場所、使用条件等により方式や
形態に多様性を呈しているが、一例を図を参照して説明
する。2. Description of the Related Art Conventionally, there are various types of devices that perform various displays by illumination. As this type of display device, there are instrumentation of mechanical devices and instruments such as vehicles. The instruments have various types and forms depending on the purpose of use, place of use, conditions of use, etc. One example will be described with reference to the drawings.
【0003】図3において、例えば板状の導光体9の厚
みと直交する方向に図示しない光源からの出射光12
(図示では光線を模式的に示す)が導かれるが、光の全
反射を利用している導光体方式の計器類では図3に見ら
れるように、平行な光線に対して傾斜面10と平行面1
1とを組み合せた凹部30を形成した構成であり、この
傾斜面10を利用して表示部13側に光を反射させるよ
うになっている。このように構成された導光体9では傾
斜面10を形成した箇所では導光体9からの出射光12
が得られて明部ができ、前記平行光線に平行な面を形成
した箇所では出射光12を得られず暗部を生じていた。In FIG. 3, for example, light emitted from a light source (not shown) 12 in a direction orthogonal to the thickness of the plate-shaped light guide 9 is shown.
(A light beam is schematically shown in the figure) is guided, but as shown in FIG. 3, in the light guide type instruments utilizing the total reflection of light, as shown in FIG. Parallel plane 1
1 has a configuration in which a concave portion 30 is formed, and the inclined surface 10 is used to reflect light to the display portion 13 side. In the light guide 9 configured as described above, the light 12 emitted from the light guide 9 is formed at the position where the inclined surface 10 is formed.
Was obtained and a bright portion was formed, and the emitted light 12 was not obtained at a portion where a surface parallel to the parallel rays was formed, and a dark portion was generated.
【0004】図4においては導光体9内に三角形の凹部
40を形成した他の従来例における光線の反射の状態を
示したものである。この三角形の凹部40に図示では導
光体9の左右方向から光線が入射してくると、前記傾斜
面10に至る左右の光線の接近領域である頂部10aが
輝度の最も強い部分として不要な線が表れ易い。特に、
三角形の凹部40の頂部10aと文字板5との間隙Sが
短いほどこの現象は顕著に現われる。FIG. 4 shows the state of light reflection in another conventional example in which a triangular recess 40 is formed in the light guide 9. In the drawing, when light rays are incident on the triangular recess 40 from the left and right directions of the light guide 9, the top portion 10a, which is the approaching area of the left and right light rays reaching the inclined surface 10, is an unnecessary line as the strongest portion. Is easy to appear. Especially,
This phenomenon becomes more prominent as the gap S between the top 10a of the triangular recess 40 and the dial 5 is shorter.
【0005】[0005]
【発明が解決しようとする課題】本発明は上記の従来例
のように、明部と暗部とが発生することにより均一の表
示がしにくい問題、さらには図4に示すように三角形の
頂部の不要な線が表れる問題に鑑み、透過照明装置の光
導板において、光を反射させたい所望の領域の輝度レベ
ルのばらつきを無くして均一にし、良好な光表示を可能
とする透過照明装置の光導板を提供することを目的とす
る。SUMMARY OF THE INVENTION The present invention has a problem that it is difficult to display a uniform image due to the occurrence of a bright portion and a dark portion as in the above-mentioned conventional example, and further, as shown in FIG. In view of the problem that unnecessary lines appear, in the light guide plate of the transillumination device, the light guide plate of the transillumination device that enables uniform and uniform brightness by eliminating variations in the brightness level of a desired region where light is desired to be reflected. The purpose is to provide.
【0006】[0006]
【課題を解決するための手段】本発明の上記課題は、所
定の開口部に表示を行うべく光源から出射した光の一部
を導くことのできる光導板を備え、前記光導板の片側側
面に透光性の表示手段を配設して該表示手段側に前記光
源からの光を反射させる反射構造を備えた透過照明装置
の光導板において、前記反射構造が前記光導板の一部に
前記表示手段の側に向かって湾曲する内壁面を有する凹
部であることを特徴とする透過照明装置の光導板によっ
て解決することができる。The above object of the present invention is to provide a light guide plate capable of guiding a part of the light emitted from the light source for displaying at a predetermined opening, and the light guide plate is provided on one side surface of the light guide plate. In a light guide plate of a transillumination device having a light-transmissive display means and a reflection structure for reflecting light from the light source on the display means side, the reflection structure displays on a part of the light guide plate. This can be solved by the light guide plate of the transillumination device, which is a recess having an inner wall surface that curves toward the means side.
【0007】また、好ましい実施の形態として、前記凹
部の内壁面の形状は球面の一部の形状からなる球面状凹
部に構成することができる。As a preferred embodiment, the shape of the inner wall surface of the recess may be a spherical recess having a shape of a part of a spherical surface.
【0008】上記本発明の光導板によれば、例えば球面
状に構成された内壁面の凹部を備えていることにより、
この光導板の肉厚方向に直交する方向から来た光は、こ
の内壁面に当たって該肉厚方向に反射されるときに、内
壁面に当たる位置によって反射後の光の進行方向を該壁
面に沿って徐々に変えることができ、反射光の分散を適
宜にすることができて輝度の強弱は不要の模様の発生を
回避することができる。According to the above-mentioned light guide plate of the present invention, since it is provided with the concave portion of the inner wall surface formed in a spherical shape,
When the light coming from the direction orthogonal to the thickness direction of the light guide plate hits the inner wall surface and is reflected in the thickness direction, the traveling direction of the light after reflection is along the wall surface depending on the position of the inner wall surface. It can be gradually changed, the dispersion of the reflected light can be appropriately adjusted, and the intensity of the brightness can avoid the generation of an unnecessary pattern.
【0009】[0009]
【発明の実施の形態】以下本発明に係わる透過照明装置
の光導板の実施の形態について図面を参照して詳細に説
明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a light guide plate of a transillumination device according to the present invention will be described in detail below with reference to the drawings.
【0010】図1は本発明に係る光導板を備えた計器類
であり、例えば車両のスピードメータ等の運行記録計1
の縦断面図である。図1において、運行記録計1は例え
ば前面ガラス(図示せず)、ケース体2、指針3及び文
字記号等を表示する表示手段である文字板5と、該文字
板5の裏面側に前記指針3を回動するための内機4と文
字板5を照明するための光源7(実際は複数設けられて
いる)とを備えていると共に、文字板5側に光源7から
の光を反射させる反射構造である凹部8を有している。FIG. 1 is an instrument equipped with a light guide plate according to the present invention. For example, an operation recorder 1 such as a vehicle speedometer.
FIG. In FIG. 1, an operation recorder 1 includes, for example, a front glass (not shown), a case body 2, a pointer 3, and a dial 5 which is a display unit for displaying character symbols, and the pointer on the back side of the dial 5. An internal unit 4 for rotating 3 and a light source 7 (actually, a plurality are provided) for illuminating the dial 5, and a reflection for reflecting the light from the light source 7 on the dial 5 side. It has a concave portion 8 which is a structure.
【0011】そして、この反射構造が光導板6の一部に
前記表示手段5の側に向かって湾曲するような内壁面を
有する構造となっている。この内壁面の湾曲率等の形状
については、文字板5に沿って入射する光を光導板6の
厚み方向に反射する形状であればよく特に限定するもの
ではない。なお、図示するように、本実施の形態におい
ては、この凹部8の内壁面の形状は球面の一部の形状か
らなる球面状凹部に構成されている。The reflecting structure has a part of the light guide plate 6 having an inner wall surface that curves toward the display means 5. The shape such as the curvature of the inner wall surface is not particularly limited as long as the light incident along the dial plate 5 is reflected in the thickness direction of the light guide plate 6. As shown in the figure, in the present embodiment, the shape of the inner wall surface of the recess 8 is a spherical recess made up of a part of the spherical surface.
【0012】前記凹部8の縦断面を図2に拡大して示
す。図2においては、球面状の凹部8に到達する光線
は、図1に示すように配置された複数の光源7から光導
板6内を伝達されて直接到達する光線(直線にて模式的
に示した光)と、光源7の光が、光導板6の厚み方向等
の外周によって適宜反射して到達する間接光線とがある
が、ここでは、理解を容易にするために、光導板6に形
成した球面状の凹部8によって反射される光(出射光)
を、球面状凹部8及び球面状凹部8近傍における光導板
6内の光線の状態を模式的に示す。図示のように、球面
状凹部8は光導板6内の光線を反射して出射光12にし
て文字板5方向に導いている。FIG. 2 shows an enlarged vertical section of the recess 8. In FIG. 2, the light rays reaching the spherical concave portion 8 are directly transmitted through the light guide plate 6 from a plurality of light sources 7 arranged as shown in FIG. 1 (schematically shown by a straight line). Light) and indirect rays that the light of the light source 7 reaches by being appropriately reflected by the outer circumference of the light guide plate 6 in the thickness direction and the like, but here, for the sake of easy understanding, they are formed on the light guide plate 6. Light reflected by the spherical recess 8 (emitted light)
3A and 3B schematically show the states of the light rays in the light guide plate 6 in the vicinity of the spherical concave portion 8 and the spherical concave portion 8. As shown in the figure, the spherical concave portion 8 reflects the light rays inside the light guide plate 6 to form outgoing light 12 and guide it toward the dial plate 5.
【0013】このように、凹部8が球面状に構成された
内壁面20を備えていることにより、例えばこの光導板
の肉厚方向に直交する方向から来た光は、この内壁面2
0に当たって該肉厚方向に反射されるときに、内壁面に
当たる位置によって反射後の光の進行方向を該壁面に沿
って徐々に変えられ、図示のごとく分散する。そして、
表示部13の中央部分は図示において左右から来る光
(実際には全周方向からくる)によって照らされるの
で、表示部13の外側寄りの部分と比較しても光線の密
度は少なくならず、全体として均一な光を提供すること
が可能となる。したがって、前記凹部8によって反射光
の分散を適宜にすることができて輝度の強弱は不要の模
様の発生を回避することができる。As described above, since the concave portion 8 is provided with the inner wall surface 20 formed in a spherical shape, for example, the light coming from the direction orthogonal to the thickness direction of the light guide plate is formed on the inner wall surface 2.
When the light strikes 0 and is reflected in the thickness direction, the traveling direction of the reflected light is gradually changed along the wall by the position of the inner wall, and the light is dispersed as illustrated. And
Since the central portion of the display unit 13 is illuminated by light coming from the left and right in the figure (actually coming from the entire circumferential direction), the density of light rays does not decrease even when compared with the outer portion of the display unit 13, As a result, it is possible to provide uniform light. Therefore, it is possible to appropriately disperse the reflected light by the concave portion 8 and to avoid the generation of an unnecessary pattern depending on the intensity of the brightness.
【0014】上述した実施の形態は、本発明をスピード
メーター等の計器に適用した場合について述べたが、本
発明は、運行記録計のみならず、種々の計器やこの種の
光導板を利用した種々の機材にも適用できることは勿論
である。Although the above-described embodiments have been described with respect to the case where the present invention is applied to an instrument such as a speedometer, the present invention utilizes not only the operation recorder but also various instruments and this kind of light guide plate. Of course, it can be applied to various equipment.
【0015】[0015]
【発明の効果】以上述べたように、本発明の光導板は凹
部が湾曲した構成の内壁面を備えているので、この光導
板の肉厚方向に進んできた光を、この内壁面に当てて該
肉厚方向に反射するときに、内壁面に当たる光の位置に
よって反射後の光の進行方向を該壁面に沿って徐々に変
えることができ、表示部の外側寄りの部分と中央寄りの
部分とを比較しても光線の密度差を少なくでき、全体と
して均一な光を提供することが可能となり、従来発生し
ていた輝度の強弱や不要の模様の発生を回避することが
できる。As described above, since the light guide plate of the present invention has the inner wall surface having the curved concave portion, the light traveling in the thickness direction of the light guide plate is applied to the inner wall surface. When the light is reflected in the thickness direction, the traveling direction of the reflected light can be gradually changed along the wall surface depending on the position of the light hitting the inner wall surface, and the outer portion and the central portion of the display section can be changed. Even when compared with, it is possible to reduce the difference in the density of the light rays, and it is possible to provide uniform light as a whole, and it is possible to avoid the intensity of brightness and the generation of unnecessary patterns that have conventionally occurred.
【図1】本発明による光導板を適用した運行記録計の要
部縦断面図である。FIG. 1 is a longitudinal sectional view of an essential part of an operation recorder to which a light guide plate according to the present invention is applied.
【図2】図1の要部拡大断面図であるり、凹部における
光線の状態を示す図である。FIG. 2 is an enlarged cross-sectional view of a main part of FIG. 1 and is a view showing a state of light rays in a recess.
【図3】従来の光導板における光線の状態を示す概略断
面図である。FIG. 3 is a schematic cross-sectional view showing a state of light rays in a conventional light guide plate.
【図4】従来の光導板における光線の状態を示す概略断
面図である。FIG. 4 is a schematic cross-sectional view showing a state of light rays in a conventional light guide plate.
1 運行記録計 2 ケース体 3 指針 5 文字板 6 光導体 7 光源 8 凹部 20 内壁面 1 Operation Recorder 2 Case Body 3 Pointer 5 Dial 6 Light Guide 7 Light Source 8 Recess 20 Inner Wall
Claims (2)
出射した光の一部を導くことのできる光導板を備え、前
記光導板の片側側面に透光性の表示手段を配設して該表
示手段側に前記光源からの光を反射させる反射構造を備
えた透過照明装置の光導板において、 前記反射構造が前記光導板の一部に前記表示手段の側に
向かって湾曲するような内壁面を有する凹部であること
を特徴とする透過照明装置の光導板。1. A light guide plate capable of guiding a part of light emitted from a light source for displaying on a predetermined opening, and a translucent display means is provided on one side surface of the light guide plate. A light guide plate of a transillumination device comprising a reflective structure for reflecting light from the light source on the display means side, wherein the reflective structure is part of the light guide plate and is curved toward the display means side. A light guide plate for a transillumination device, which is a recess having a wall surface.
形状からなる球面状凹部に構成されていることを特徴と
する請求項1に記載の透過照明装置の光導板。2. The light guide plate of the transillumination device according to claim 1, wherein the shape of the inner wall surface of the concave portion is a spherical concave portion formed of a part of a spherical surface.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23154995A JPH0979872A (en) | 1995-09-08 | 1995-09-08 | Light guide plate for transmission lighting system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23154995A JPH0979872A (en) | 1995-09-08 | 1995-09-08 | Light guide plate for transmission lighting system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0979872A true JPH0979872A (en) | 1997-03-28 |
Family
ID=16925241
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23154995A Pending JPH0979872A (en) | 1995-09-08 | 1995-09-08 | Light guide plate for transmission lighting system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0979872A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1113246A3 (en) * | 1999-12-01 | 2002-01-23 | Mannesmann VDO Aktiengesellschaft | Illuminating device for dial indicator |
JP2009128244A (en) * | 2007-11-26 | 2009-06-11 | Denso Corp | Pointer meter |
JP2013106651A (en) * | 2011-11-17 | 2013-06-06 | Sansei R&D:Kk | Game machine |
-
1995
- 1995-09-08 JP JP23154995A patent/JPH0979872A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1113246A3 (en) * | 1999-12-01 | 2002-01-23 | Mannesmann VDO Aktiengesellschaft | Illuminating device for dial indicator |
US6572235B1 (en) | 1999-12-01 | 2003-06-03 | Mannesmann Vdo Ag | Arrangement for illuminating a display device with a dial |
JP2009128244A (en) * | 2007-11-26 | 2009-06-11 | Denso Corp | Pointer meter |
JP2013106651A (en) * | 2011-11-17 | 2013-06-06 | Sansei R&D:Kk | Game machine |
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