JP2010139296A - Light guide plate - Google Patents

Light guide plate Download PDF

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JP2010139296A
JP2010139296A JP2008314006A JP2008314006A JP2010139296A JP 2010139296 A JP2010139296 A JP 2010139296A JP 2008314006 A JP2008314006 A JP 2008314006A JP 2008314006 A JP2008314006 A JP 2008314006A JP 2010139296 A JP2010139296 A JP 2010139296A
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guide plate
light
light guide
incident
light source
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JP5384924B2 (en
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Taketsugu Okura
健嗣 大倉
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Yazaki Corp
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Yazaki Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a light guide plate which guides light to its inner surface side as well and emits light uniformly. <P>SOLUTION: The light guide plate 4 is arranged on the back side of a dial plate and is formed into an arc shape in plane view. On the outer surface of this light guide plate 4, a plurality of protrusions 42 are provided side by side. These protrusions 42 are arranged into a round shape so that their inclinations become gentler as they approach the top. Between these protrusions 42 and 42, recessions 43 are provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、導光板に係り、特に、文字板の背面側に配置された平面視弧状の透過性の導光板に関するものである。   The present invention relates to a light guide plate, and more particularly, to a transparent light guide plate having an arcuate shape arranged on the back side of a dial.

上述した導光板を備えた計器１として、例えば、図１に示すようなものが知られている。同図に示すように、上記計器１は、文字板２と、指針３と、導光板４と、ウォーニング用光源Ｌ１と、導光板用光源Ｌ２と、基板５と、ケーシング６と、表ガラス７と、を備えている。上記文字板２には、ウォーニングや目盛などの意匠が設けられている。上記指針３は、文字板２の正面を回動するように設けられている。導光板４は、文字板２の背面に配置されている。導光板４は、図１２に示すように、文字板２に設けられた目盛に沿って平面視円弧状に設けられている。   As the instrument 1 provided with the above-described light guide plate, for example, one as shown in FIG. 1 is known. As shown in the figure, the instrument 1 includes a dial 2, a pointer 3, a light guide plate 4, a warning light source L1, a light guide light source L2, a substrate 5, a casing 6, and a front glass 7. And. The dial 2 is provided with designs such as warnings and scales. The pointer 3 is provided so as to rotate in front of the dial 2. The light guide plate 4 is disposed on the back surface of the dial 2. As shown in FIG. 12, the light guide plate 4 is provided in an arc shape in plan view along the scale provided on the dial 2.

ウォーニング用光源Ｌ１は、文字板２に設けたウォーニングの背面に配置されていて、ウォーニングを光輝させる。導光板用光源Ｌ２は、図１２に示すように、上記導光板４の端面４１に対向して配置されていて、導光板４内を導光して文字板２に設けた目盛を光輝させる。基板５は、上記ウォーニング用光源Ｌ１や導光板用光源Ｌ２などの電子機器を搭載する。ケーシング６は、上記文字板２、指針３、導光板４、ウォーニング用光源Ｌ１、導光板用光源Ｌ２、基板５などを収容する。表ガラス７は、ケーシング６の正面開口に取り付けられている。   The warning light source L1 is disposed on the back surface of the warning provided on the dial 2, and shines the warning. As shown in FIG. 12, the light source L2 for the light guide plate is disposed so as to face the end surface 41 of the light guide plate 4, and guides the light guide plate 4 to shine the scale provided on the dial 2. The substrate 5 is mounted with electronic devices such as the warning light source L1 and the light guide plate light source L2. The casing 6 accommodates the dial 2, the pointer 3, the light guide plate 4, the warning light source L1, the light guide light source L2, the substrate 5, and the like. The front glass 7 is attached to the front opening of the casing 6.

次に、上述した導光板４内の光の反射経路について図１２を参照して説明する。なお、図中、矢印は、導光板用光源Ｌ２から導光板４に入射した光の光路を示し、斜線が光の通過範囲を示す。同図に示すように、導光板４の端面４１から入射した光は、導光板４の外側面で反射して導光板４中央に導光される。しかしながら、上述した図１２に示すように外側面が円弧状に形成された導光板４では、中央部の内側面側であるＡ部や端部の内側面側であるＢ部に導光板用光源Ｌ２からの光が通過せずに、Ａ部、Ｂ部が暗く発光する暗部になる。このため、導光板４の明るさにムラが生じる、という問題があった。   Next, the light reflection path in the light guide plate 4 will be described with reference to FIG. In the drawing, an arrow indicates an optical path of light incident on the light guide plate 4 from the light guide plate light source L2, and an oblique line indicates a light passage range. As shown in the figure, the light incident from the end surface 41 of the light guide plate 4 is reflected by the outer surface of the light guide plate 4 and guided to the center of the light guide plate 4. However, in the light guide plate 4 whose outer surface is formed in an arc shape as shown in FIG. 12 described above, the light source for the light guide plate is placed on the A portion which is the inner side surface of the central portion and the B portion which is the inner side surface of the end portion. The light from L2 does not pass, and the A part and the B part become dark parts that emit light darkly. For this reason, there is a problem that unevenness occurs in the brightness of the light guide plate 4.

そこで、例えば、図１３（Ａ）に示すように外側面を複数の平面４５で構成した導光板４や、図１３（Ｂ）に示すように、図１３（Ａ）中の平面４５を円弧状の凹面４６で構成した導光板４が提案されている（特許文献１）。しかしながら、図１３（Ａ）に示すように、単に外側面を複数の平面４１で構成した導光板４では、入射光に対する平面４１の角度に制限があり、Ａ部への光の通過量を多くするような形状に設計するのは限界があった。また、図１３（Ｂ）に示すように、外側面を複数の凹面４６で構成した導光板４では、凹面４６と凹面４６との間に設けられた凸部の頂部付近の幅が極端に狭くなり頂部付近で光が反射を繰り返して、導光板４全体に拡散しにくい。このため、Ａ部への光の通過量を多くすることができず、導光板４の明るさにムラが生じる、という問題は解決されていなかった。
特開２００７−１３９７９１号公報 Therefore, for example, as shown in FIG. 13A, the light guide plate 4 whose outer surface is composed of a plurality of flat surfaces 45, or as shown in FIG. 13B, the flat surface 45 in FIG. A light guide plate 4 having a concave surface 46 is proposed (Patent Document 1). However, as shown in FIG. 13A, in the light guide plate 4 in which the outer surface is simply composed of a plurality of planes 41, the angle of the plane 41 with respect to the incident light is limited, and the amount of light passing through the A portion is large. There was a limit to designing in such a shape. Further, as shown in FIG. 13B, in the light guide plate 4 whose outer surface is composed of a plurality of concave surfaces 46, the width near the top of the convex portion provided between the concave surface 46 and the concave surface 46 is extremely narrow. Light is repeatedly reflected in the vicinity of the top and hardly diffuses throughout the light guide plate 4. For this reason, the amount of light passing through the portion A cannot be increased, and the problem of unevenness in the brightness of the light guide plate 4 has not been solved.
JP 2007-139791 A

そこで、本発明は、内側面側にも光を導いてムラなく発光する導光板を提供することを課題とする。   Then, this invention makes it a subject to provide the light-guide plate which guides light also to an inner surface side, and light-emits uniformly.

上記課題を解決するためになされた請求項１記載の発明は、文字板の背面側に配置された平面視弧状の透過性の導光板において、頂部に近づくに従って傾斜が緩くなるような形状、又は、頂部までの傾斜が一定となるような形状の凸部が、当該導光板の外側面に複数並べて設けられ、前記凸部と前記凸部との間に凹部が、設けられたことを特徴とする導光板に存する。   The invention according to claim 1, which has been made in order to solve the above-mentioned problems, is a shape in which the inclination of the transparent light guide plate arranged on the back side of the dial plate becomes gentler as it approaches the top, or A plurality of convex portions having a shape with a constant inclination to the top portion are provided side by side on the outer surface of the light guide plate, and a concave portion is provided between the convex portion and the convex portion. Exist in the light guide plate.

請求項２記載の発明は、光源からの光を入射するための入射面が、前記平面視弧状の導光板の端面に設けられ、前記凸部が、前記導光板の外側面の入射面から所定距離離間した部分に設けられたことを特徴とする請求項１に記載の導光板に存する。   According to a second aspect of the present invention, an incident surface for entering light from a light source is provided on an end surface of the arcuate light guide plate, and the convex portion is predetermined from the incident surface of the outer surface of the light guide plate. The light guide plate according to claim 1, wherein the light guide plate is provided in a portion separated by a distance.

請求項３記載の発明は、光源からの光を入射するための入射面が、前記平面視弧状の導光板の端面に設けられ、前記導光板の入射面に近づくに従って前記凸部と前記凸部との間が広くなるように前記凸部が、設けられたことを特徴とする請求項１に記載の導光板に存する。   According to a third aspect of the present invention, an incident surface for incident light from a light source is provided on an end surface of the arcuate light guide plate, and the convex portion and the convex portion approach the incident surface of the light guide plate. The light guide plate according to claim 1, wherein the convex portion is provided so as to be widened between.

請求項４記載の発明は、前記平面視弧状の導光板の端面から入射した光が前記外側面で反射して中央部側の外側面に向かうように配置された第１光源が、設けられ、前記平面視弧状の導光板の端面から入射した光が前記外側面で反射して中央部側の内側面に向かうように配置された第２光源が、設けられたことを特徴とする請求項１〜３何れか１項に記載の導光板に存する。   The invention according to claim 4 is provided with a first light source arranged such that light incident from an end face of the light guide plate having an arcuate shape in plan view is reflected by the outer surface and directed toward the outer surface on the center side. 2. A second light source arranged so that light incident from an end surface of the light guide plate having an arc shape in a plan view is reflected by the outer surface and directed toward an inner surface on the center side. It exists in the light-guide plate of any one of -3.

以上説明したように請求項１記載の発明によれば、従来の図１２、図１３に示す導光板に比べてより一層多くの光を内側面側に導くことができ、ムラなく発光する導光板を提供することができる。   As described above, according to the first aspect of the present invention, the light guide plate can emit more light than the conventional light guide plates shown in FIGS. 12 and 13 and emits light evenly. Can be provided.

請求項２及び３記載の発明によれば、より一層多くの光を導光板の中央部の内側面側に導くことができ、ムラなく発光する導光板を提供することができる。   According to invention of Claim 2 and 3, much more light can be guide | induced to the inner surface side of the center part of a light-guide plate, and the light-guide plate which light-emits uniformly can be provided.

請求項４記載の発明によれば、第１光源からの光がより中央部側の外側面に向かって反射され、第２光源からの光が内側面に向かって反射されるため、より一層ムラなく発光する導光板を提供することができる。   According to the fourth aspect of the present invention, the light from the first light source is reflected toward the outer surface on the central portion side, and the light from the second light source is reflected toward the inner surface. A light guide plate that emits light without any problem can be provided.

第１実施形態
以下、本発明の第１実施形態を図面に基づいて説明する。図１は本発明の導光板を組み込んだ計器の一実施形態を示す断面図である。同図に示すように、計器１は、文字板２と、指針３と、導光板４と、ウォーニング用光源Ｌ１と、導光板用光源Ｌ２と、基板５と、ケーシング６と、表ガラス７と、を備えている。上記文字板２、指針３、ウォーニング用光源Ｌ１、導光板用光源Ｌ２、基板５、ケーシング６及び表ガラス７については、上述した背景技術で説明したものと同等であるため、ここでは詳細な説明は省略する。 First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of a meter incorporating the light guide plate of the present invention. As shown in the figure, the instrument 1 includes a dial 2, a pointer 3, a light guide plate 4, a warning light source L1, a light guide plate light source L2, a substrate 5, a casing 6, and a front glass 7. It is equipped with. The dial 2, the pointer 3, the warning light source L1, the light guide plate light source L2, the substrate 5, the casing 6, and the front glass 7 are the same as those described in the background art described above, and therefore are described in detail here. Is omitted.

上記導光板４は、アクリル樹脂などの透光性の部材から構成されている。導光板４は、図２及び図３に示すように、文字板２に設けられた目盛に沿って平面視円弧状に設けられている。導光板４は、その両端面に導光板用光源Ｌ２からの光を入射する入射面４１が設けられている。導光板用光源Ｌ２はこの入射面４１に対向するように配置されている。また、導光板４は、その外側面に複数の凸部４２が並べて設けられている。   The light guide plate 4 is made of a translucent member such as acrylic resin. As shown in FIGS. 2 and 3, the light guide plate 4 is provided in an arc shape in plan view along the scale provided on the dial 2. The light guide plate 4 is provided with incident surfaces 41 on both ends of which the light from the light source L2 for the light guide plate is incident. The light source L2 for the light guide plate is disposed so as to face the incident surface 41. Further, the light guide plate 4 is provided with a plurality of convex portions 42 arranged on the outer surface thereof.

複数の凸部４２は、導光板４の外側面の周方向Ｙ１全長に亘って設けられている。複数の凸部４２は、凸部４２と凸部４２との間隔を空けることなく、連続して設けられている。複数の凸部４２は、全て同一形状に設けられている。そして、この凸部４２は、頂部に近づくに従って傾斜が緩くなるような丸形状に設けられている。また、この凸部４２と凸部４２との間には凹部４３が設けられている。   The plurality of convex portions 42 are provided over the entire circumferential direction Y1 of the outer surface of the light guide plate 4. The plurality of convex portions 42 are continuously provided without a gap between the convex portions 42 and the convex portions 42. The plurality of convex portions 42 are all provided in the same shape. And this convex part 42 is provided in the round shape so that inclination becomes loose as it approaches the top part. In addition, a concave portion 43 is provided between the convex portion 42 and the convex portion 42.

次に、図４及び図５を参照して導光板４内での導光板用光源Ｌ２から入射される光の反射経路について説明する。図４に示すように、導光板用光源Ｌ２からの光は、入射面４１から導光板４内に入射される。入射面から導光板４に入射された光は、導光板４の外側面で反射される。上述したように外側面には頂部に近づくに従って傾斜が緩くなるような丸形状の凸部４２が複数設けられている。よって、図５（Ａ）に示すように、凸部４２の入射面４１側で反射された光は、導光板４の周方向Ｙ１の中央部に向かって反射される。一方、凸部４２の中央部側で反射された光は、導光板４の内側面に向かって反射される。全ての各凸部４２で同様の光の反射が生じるため、図４に示すように、導光板用光源Ｌ２からの光は周方向Ｙ１全体に亘って内側面側に導かれ、導光板４の中央部の内側面側であるＡ部にも導光板４の端部の内側面側であるＢ部にも光が導かれる。結果。導光板４全体がムラなく、均一に発光する。   Next, a reflection path of light incident from the light source L2 for the light guide plate in the light guide plate 4 will be described with reference to FIGS. As shown in FIG. 4, light from the light guide plate light source L <b> 2 enters the light guide plate 4 from the incident surface 41. Light incident on the light guide plate 4 from the incident surface is reflected on the outer surface of the light guide plate 4. As described above, the outer surface is provided with a plurality of round-shaped convex portions 42 whose slopes become gentler toward the top. Therefore, as shown in FIG. 5A, the light reflected on the incident surface 41 side of the convex portion 42 is reflected toward the central portion of the light guide plate 4 in the circumferential direction Y1. On the other hand, the light reflected on the central portion side of the convex portion 42 is reflected toward the inner surface of the light guide plate 4. Since the same light reflection occurs in all the convex portions 42, as shown in FIG. 4, the light from the light source L2 for the light guide plate is guided to the inner side surface over the entire circumferential direction Y1, and the light guide plate 4 Light is guided to part A, which is the inner side of the central part, and part B, which is the inner side of the end of the light guide plate 4. result. The entire light guide plate 4 emits light uniformly.

次に、本発明者は、上述した図１３（Ａ）に示す形状の導光板４である従来品と、図２に示す形状の導光板４である本発明品と、の導光板用光源Ｌ２からの光の外側面での反射経路をシミュレーションして、上記効果を確認した。結果を図６及び図７に示す。同図に示すように、本発明品のほうが従来品に比べて導光板４の外側面で反射される光が拡散して、導光板４の内側面側にも光が導かれていることが分かった。   Next, the inventor of the present invention is a light source L2 for the light guide plate of the above-described conventional product, which is the light guide plate 4 having the shape shown in FIG. The above-mentioned effect was confirmed by simulating the reflection path on the outer surface of the light from. The results are shown in FIGS. As shown in the figure, the light reflected from the outer surface of the light guide plate 4 is diffused in the product of the present invention compared to the conventional product, and the light is also guided to the inner surface side of the light guide plate 4. I understood.

なお、図７は、２つの導光板用光源Ｌ２が設けられている。外側面側に配置された第１光源としての第１導光板用光源Ｌ２は、導光板４の端面４１から入射した光が外側面で反射して中央部側の外側面に向かうように配置されている。内側面側に配置された第２導光板用光源Ｌ２は、導光板４の端面４１から入射した光が外側面で反射して中央部側の内側面に向かうように配置されている。このように２つの導光板用光源Ｌ２を配置することにより、外側面側に配置された第１導光板用光源Ｌ２からの光がより中央部側の外側面に向かって反射され、内側面側に配置された第２導光板用光源Ｌ２からの光が内側面に向かって反射されるため、導光板４がより一層ムラなく発光できるようにしている。そして、２つの導光板用光源Ｌ２を配置した場合であっても、図７（Ａ）及び（Ｂ）を比較しても明らかなように、本発明品のほうが従来品に比べて導光板４の外側面で反射される光が拡散して、ムラなく発光していることが分かる。   In FIG. 7, two light sources L2 for the light guide plate are provided. The light source L2 for the first light guide plate as the first light source arranged on the outer surface side is arranged so that the light incident from the end surface 41 of the light guide plate 4 is reflected on the outer surface and directed toward the outer surface on the center side. ing. The light source L2 for the second light guide plate disposed on the inner surface side is disposed such that light incident from the end surface 41 of the light guide plate 4 is reflected on the outer surface and directed toward the inner surface on the center side. By arranging the two light guide plate light sources L2 in this way, the light from the first light guide plate light source L2 arranged on the outer surface side is reflected toward the outer surface on the center side, and the inner surface side. Since the light from the light source L2 for the second light guide plate disposed on the light source is reflected toward the inner surface, the light guide plate 4 can emit light more evenly. And even if it is a case where the light source L2 for two light-guide plates is arrange | positioned, as FIG. 7 (A) and (B) compare, the product of this invention is more light-guide plate 4 than the conventional product. It can be seen that the light reflected by the outer surface of the light diffuses and emits light evenly.

第２実施形態
なお、上述した第１実施形態では、凸部４２を頂部に近づくに従って傾斜が緩くなるような丸形状に設けていたが、本発明はこれに限ったものではない。例えば、図８に示すように、凸部４２を頂部までの傾斜が一定な三角形状に設けても第１実施形態と同様の効果を得ることができる。 Second Embodiment In the first embodiment described above, the convex portion 42 is provided in a round shape such that the inclination becomes gentler toward the top portion, but the present invention is not limited to this. For example, as shown in FIG. 8, the same effect as that of the first embodiment can be obtained even when the convex portion 42 is provided in a triangular shape with a constant inclination to the top.

第３実施形態
また、上述した第２実施形態では、凸部４２を三角形状に設けていたが、本発明はこれに限ったものではない。例えば、図９に示すように、頂部を面状に設けて凸部４２の頂部までの傾斜が一定な台形形状に設けても第２実施形態と同様の効果を得ることができる。 3rd Embodiment Moreover, in 2nd Embodiment mentioned above, although the convex part 42 was provided in triangle shape, this invention is not limited to this. For example, as shown in FIG. 9, the same effect as in the second embodiment can be obtained even if the top is provided in a planar shape and is provided in a trapezoidal shape with a constant inclination to the top of the convex portion 42.

第４実施形態
また、上述した第１〜第３実施形態では、導光板４の外側面の周方向Ｙ１全長に亘って凸部を設けていたが、本発明はこれに限ったものではない。例えば、Ｂ部を明るくする必要がない場合、図１０に示すように、導光板４の外側面の入射面４１から所定距離Ｌ離間した部分に凸部４２を設けてもよい。このように構成することにより、導光板４の外側面の入射面４１から所定距離Ｌ内の部分には凸部４２が設けられない。これにより、図１０（Ｂ）に示すように、凸部４２が設けられていない外側面ではより多くの光が中央部に向かって反射される。そして、中央部の外側面に設けた凸部４２で内側面側に向かって反射されるため、より一層Ａ部を明るく発光させることができる。言い換えると、図２に示す導光板４においてＢ部に向かって反射された光をＡ部に集めることができ、より一層Ａ部を明るく発光させることができる。 4th Embodiment Moreover, in 1st-3rd embodiment mentioned above, although the convex part was provided over the circumferential direction Y1 full length of the outer surface of the light-guide plate 4, this invention is not limited to this. For example, when it is not necessary to brighten the B portion, as shown in FIG. 10, the convex portion 42 may be provided in a portion separated by a predetermined distance L from the incident surface 41 on the outer side surface of the light guide plate 4. With this configuration, the convex portion 42 is not provided in a portion within the predetermined distance L from the incident surface 41 on the outer surface of the light guide plate 4. As a result, as shown in FIG. 10B, more light is reflected toward the central portion on the outer surface where the convex portions 42 are not provided. And since it is reflected toward the inner surface side by the convex part 42 provided in the outer side surface of the center part, A part can be made to further light-emit. In other words, the light reflected toward the B portion in the light guide plate 4 shown in FIG. 2 can be collected in the A portion, and the A portion can be further lightened.

第５実施形態
また、上述した第１〜第３実施形態では、凸部４２と凸部４２との間を空けることなく、連続して凸部４２を設けていたが、本発明はこれに限ったものではない。Ｂ部を明るくする必要がない場合、図１１に示すように、入射面４１側に近づくに従って凸部４２と凸部４２との間隔を広くなるように設けても良い。凸部４２と凸部４２との間で反射した光は導光板４の中央部に導かれるため、入射面４１側の外側面ではより多くの光が中央部に向かって反射される。そして、中央部の外側面に設けた凸部４２で内側面側に向かって反射されるため、より一層Ａ部を明るく発光させることができる。言い換えると、第４実施形態と同様に、図２に示す導光板４においてＢ部に向かって反射された光をＡ部に集めることができ、より一層Ａ部を明るく発光させることができる。 5th Embodiment Moreover, in 1st-3rd embodiment mentioned above, although the convex part 42 was provided continuously, without leaving the space | interval between the convex part 42 and the convex part 42, this invention is limited to this. Not a thing. When it is not necessary to brighten B part, as shown in FIG. 11, you may provide so that the space | interval of the convex part 42 and the convex part 42 may become wide as it approaches the entrance plane 41 side. Since the light reflected between the convex part 42 and the convex part 42 is guide | induced to the center part of the light-guide plate 4, more light is reflected toward a center part in the outer surface by the side of the entrance plane 41. FIG. And since it is reflected toward the inner surface side by the convex part 42 provided in the outer side surface of the center part, A part can be made to further light-emit. In other words, similarly to the fourth embodiment, the light reflected toward the B portion in the light guide plate 4 shown in FIG. 2 can be collected in the A portion, and the A portion can be further illuminated.

また、前述した実施形態は本発明の代表的な形態を示したに過ぎず、本発明は、実施形態に限定されるものではない。即ち、本発明の骨子を逸脱しない範囲で種々変形して実施することができる。   Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

本発明の導光板を組み込んだ計器の一実施形態を示す断面図である。It is sectional drawing which shows one Embodiment of the meter incorporating the light-guide plate of this invention. 第１実施形態における図１に示す導光板の正面図である。It is a front view of the light-guide plate shown in FIG. 1 in 1st Embodiment. 図２のＣ部の拡大斜視図である。It is an expansion perspective view of the C section of FIG. 図２に示す導光板内の光の反射経路を説明するための説明図である。It is explanatory drawing for demonstrating the reflection path | route of the light in the light-guide plate shown in FIG. （Ａ）は図２に示す導光板の凸部での光の反射を説明するための説明図であり、（Ｂ）は図２に示す導光板の光の通過領域を説明するための説明図である。(A) is explanatory drawing for demonstrating reflection of the light in the convex part of the light-guide plate shown in FIG. 2, (B) is explanatory drawing for demonstrating the light passage area of the light-guide plate shown in FIG. It is. （Ａ）は導光板用光源が１つのときの本発明品における外側面での反射経路をシミュレーションした結果を示す説明図であり、（Ｂ）は導光板用光源が１つのときの従来品における外側面での反射経路をシミュレーションした結果を示す説明図である。(A) is explanatory drawing which shows the result of having simulated the reflection path | route in the outer surface in the product of this invention when there is one light source for light guide plates, (B) is in the conventional product when there is one light source for light guide plates. It is explanatory drawing which shows the result of having simulated the reflective path | route in an outer surface. （Ａ）は導光板用光源が２つのときの本発明品における外側面での反射経路をシミュレーションした結果を示す説明図であり、（Ｂ）は導光板用光源が２つのときの本発明品における外側面での反射経路をシミュレーションした結果を示す説明図である。(A) is explanatory drawing which shows the result of having simulated the reflection path | route in the outer surface in this invention product when there are two light sources for light guide plates, (B) is this invention product when there are two light sources for light guide plates. It is explanatory drawing which shows the result of having simulated the reflection path | route in the outer surface in. 第２実施形態における図１に示す導光板の部分拡大斜視図である。It is a partial expansion perspective view of the light-guide plate shown in FIG. 1 in 2nd Embodiment. 第３実施形態における図１に示す導光板の部分拡大斜視図である。It is a partial expansion perspective view of the light-guide plate shown in FIG. 1 in 3rd Embodiment. 第４実施形態における図１に示す導光板の正面図である。It is a front view of the light-guide plate shown in FIG. 1 in 4th Embodiment. 第５実施形態における図１に示す導光板の正面図である。It is a front view of the light-guide plate shown in FIG. 1 in 5th Embodiment. 従来の導光板の一例を示す正面図である。It is a front view which shows an example of the conventional light-guide plate. 従来の導光板の一例を示す正面図である。It is a front view which shows an example of the conventional light-guide plate.

符号の説明Explanation of symbols

２ 文字板
４ 導光板
４１ 入射面
４２ 凸部
４３ 凹部 2 Dial 4 Light guide plate 41 Incident surface 42 Convex part 43 Concave part

Claims (4)

文字板の背面側に配置された平面視弧状の透過性の導光板において、
頂部に近づくに従って傾斜が緩くなるような形状、又は、頂部までの傾斜が一定となるような形状の凸部が、当該導光板の外側面に複数並べて設けられ、
前記凸部と前記凸部との間に凹部が、設けられた
ことを特徴とする導光板。 In a transparent light guide plate with a plan view arc arranged on the back side of the dial,
A shape in which the inclination becomes gentler as it approaches the top, or a plurality of convex portions having a shape that makes the inclination to the top constant, are arranged side by side on the outer surface of the light guide plate,
A light guide plate, wherein a concave portion is provided between the convex portion and the convex portion. 光源からの光を入射するための入射面が、前記平面視弧状の導光板の端面に設けられ、
前記凸部が、前記導光板の外側面の入射面から所定距離離間した部分に設けられた
ことを特徴とする請求項１に記載の導光板。 An incident surface for entering light from the light source is provided on an end surface of the planar light guide plate in an arc shape,
The light guide plate according to claim 1, wherein the convex portion is provided in a portion spaced a predetermined distance from an incident surface on an outer side surface of the light guide plate. 光源からの光を入射するための入射面が、前記平面視弧状の導光板の端面に設けられ、
前記導光板の入射面に近づくに従って前記凸部と前記凸部との間が広くなるように前記凸部が、設けられた
ことを特徴とする請求項１に記載の導光板。 An incident surface for entering light from the light source is provided on an end surface of the planar light guide plate in an arc shape,
The light guide plate according to claim 1, wherein the convex portion is provided so that a space between the convex portion and the convex portion becomes wider as approaching an incident surface of the light guide plate. 前記平面視弧状の導光板の端面から入射した光が前記外側面で反射して中央部側の外側面に向かうように配置された第１光源が、設けられ、
前記平面視弧状の導光板の端面から入射した光が前記外側面で反射して中央部側の内側面に向かうように配置された第２光源が、設けられた
ことを特徴とする請求項１〜３何れか１項に記載の導光板。 A first light source disposed so that light incident from an end surface of the arcuate light guide plate in plan view is reflected by the outer surface and directed toward the outer surface on the center side;
2. A second light source disposed so that light incident from an end surface of the arcuate light guide plate in plan view is reflected by the outer surface and directed toward the inner surface on the center side is provided. The light guide plate according to any one of? 3.
JP2008314006A 2008-12-10 2008-12-10 Light guide plate Expired - Fee Related JP5384924B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2543976A1 (en) 2011-07-06 2013-01-09 Calsonic Kansei Corporation Instrument illumination device
JP2015029622A (en) * 2013-07-31 2015-02-16 株式会社三洋物産 Game machine
CN109633805A (en) * 2018-12-05 2019-04-16 广州美术学院 A kind of light conducting plate structure with curved surface
JP2021104439A (en) * 2019-07-24 2021-07-26 株式会社三洋物産 Game machine

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JP2004134223A (en) * 2002-10-10 2004-04-30 Alps Electric Co Ltd Light guide material and lighting device
JP2006214953A (en) * 2005-02-07 2006-08-17 Citizen Electronics Co Ltd Meter panel for car
JP2007139791A (en) * 2006-12-21 2007-06-07 Denso Corp Display device
JP2008140550A (en) * 2006-11-29 2008-06-19 Sharp Corp Light guide body, and illuminating device

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Publication number Priority date Publication date Assignee Title
JPS61165504U (en) * 1985-04-03 1986-10-14
JP2004134223A (en) * 2002-10-10 2004-04-30 Alps Electric Co Ltd Light guide material and lighting device
JP2006214953A (en) * 2005-02-07 2006-08-17 Citizen Electronics Co Ltd Meter panel for car
JP2008140550A (en) * 2006-11-29 2008-06-19 Sharp Corp Light guide body, and illuminating device
JP2007139791A (en) * 2006-12-21 2007-06-07 Denso Corp Display device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2543976A1 (en) 2011-07-06 2013-01-09 Calsonic Kansei Corporation Instrument illumination device
US8840260B2 (en) 2011-07-06 2014-09-23 Calsonic Kansei Corporation Instrument illumination device
JP2015029622A (en) * 2013-07-31 2015-02-16 株式会社三洋物産 Game machine
CN109633805A (en) * 2018-12-05 2019-04-16 广州美术学院 A kind of light conducting plate structure with curved surface
CN109633805B (en) * 2018-12-05 2023-11-07 广州美术学院 Light guide plate structure with curved surface
JP2021104439A (en) * 2019-07-24 2021-07-26 株式会社三洋物産 Game machine

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