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JP2011040367A - Light guide plate - Google Patents

Light guide plate Download PDF

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JP2011040367A
JP2011040367A JP2010115097A JP2010115097A JP2011040367A JP 2011040367 A JP2011040367 A JP 2011040367A JP 2010115097 A JP2010115097 A JP 2010115097A JP 2010115097 A JP2010115097 A JP 2010115097A JP 2011040367 A JP2011040367 A JP 2011040367A
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guide plate
light
light guide
arc
incident
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JP2010115097A
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JP5462071B2 (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 in which light incident from the end face of the light guide plate can be guided to the front face efficiently. <P>SOLUTION: The light transmission light guide plate 4 which is arc-shaped in a plan view is arranged in the rear face of a dial plate, and light is made incident from both end faces. The light guide plate 4 includes a plurality of radial grooves 42 installed in a radial shape at a fixed spacing, and an arc shaped groove 43 installed in the arc shape so as to cross these plurality of radial grooves 42. <P>COPYRIGHT: (C)2011,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円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 arc shape in a plan view 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及び図２に示すようなものが知られている（例えば特許文献１）。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１４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。この導光板４の背面には、図１４に示すように、一定間隔で放射状に設けた複数の放射状溝４２が設けられている。   As the instrument 1 provided with the light guide plate described above, for example, one as shown in FIGS. 1 and 2 is known (for example, Patent Document 1). 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. 14, the light guide plate 4 is provided in an arc shape in plan view along the scale provided on the dial 2. As shown in FIG. 14, a plurality of radial grooves 42 provided radially at regular intervals are provided on the back surface of the light guide plate 4.

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１４に示すように、上記円弧状の導光板４の両端面に設けた入射面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. 14, the light source L2 for the light guide plate is disposed so as to oppose the incident surfaces 41 provided on both end faces of the arc-shaped light guide plate 4, and guides the light guide plate 4 so as to guide the dial. The scale provided in 2 is brilliant. 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 houses the dial 2, the pointer 3, the light guide plate 4, the warning light source L1, the light guide plate 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説明する。導光板用光源Ｌ２から射出される光は、入射面４１を介して導光板４に入射される。そして、入射面４１から入射された光は、導光板４の外側面で反射され、円弧状の導光板４中央に向かって伝播すると共に、その一部が放射状溝４２の内側面で反射されて効率的に正面の文字板２に導かれる。上記放射状溝４２は、この放射状溝４２に対して垂直に光が入射されると、その光を反射して文字板２に対して垂直に出射する。よって、入射面４１から入射した光は、導光板４の円弧に沿って導光板４内を導光するのが理想的である。   Next, the light reflection path in the light guide plate 4 will be described. Light emitted from the light guide plate light source L2 enters the light guide plate 4 via the incident surface 41. The light incident from the incident surface 41 is reflected by the outer surface of the light guide plate 4 and propagates toward the center of the arcuate light guide plate 4, and a part of the light is reflected by the inner surface of the radial groove 42. It is efficiently guided to the front dial 2. When light enters the radial groove 42 perpendicularly to the radial groove 42, the radial groove 42 reflects the light and emits it perpendicularly to the dial 2. Therefore, the light incident from the incident surface 41 is ideally guided in the light guide plate 4 along the arc of the light guide plate 4.

しかしながら、上記導光板４は、下記に示す問題点があった。即ち、図１５に示すように、入射面４１から導光板４内に入射された光のうち外側面４４側を導光する光Ｌ１１は、導光板４の外側面４４において入射面４１に近い部分に入射される。また、入射面４１から導光板４内に入射された光のうち外側面４４−内側面４５間中央を導光する光Ｌ１２は、導光板４の外側面４４において光Ｌ１１よりも入射面４１から離れた部分に入射される。また、入射面４１から導光板４内に入射された光のうち内側面４５側を導光する光Ｌ１３は、導光板４の外側面４４において光Ｌ１１、Ｌ１２よりも入射面４１から離れた部分に入射される。よって、内側面側を導光する光ほど外側面４４に対する入射角が小さくなる（θ１＞θ２＞θ３）。   However, the light guide plate 4 has the following problems. That is, as shown in FIG. 15, the light L <b> 11 that guides the light incident on the outer surface 44 side from the light incident surface 41 into the light guide plate 4 is a portion near the light incident surface 41 on the outer surface 44 of the light guide plate 4. Is incident on. The light L12 that guides the center between the outer surface 44 and the inner surface 45 out of the light incident from the incident surface 41 into the light guide plate 4 is more incident on the outer surface 44 of the light guide plate 4 than the light L11. It is incident on a distant part. In addition, the light L13 that guides the inner surface 45 side of the light that has entered the light guide plate 4 from the incident surface 41 is a portion that is farther from the incident surface 41 than the lights L11 and L12 on the outer surface 44 of the light guide plate 4. Is incident on. Therefore, the incident angle with respect to the outer surface 44 becomes smaller as the light guides the inner surface side (θ1> θ2> θ3).

これにより、光Ｌ１１は、外側面４４で反射されて円弧状にほぼ沿って導光板４内を導光するが、光Ｌ１２、Ｌ１３は、導光板４の外側面４４で導光板４の内側面に向かって反射され、導光板４の円弧に沿って導光しない。このため、図１６に示すように、光Ｌ１１は放射状溝４２に対してほぼ垂直に入射されるが、光Ｌ１２、Ｌ１３は放射状溝４２に対して垂直に入射されない。光Ｌ１２、Ｌ１３については、放射状溝４２で反射して文字板２に対して垂直に射出することができず、導光板４の入射面４１から入射した光を効率的に正面の文字板２に導くことができず、輝度斑が生じてしまう、という問題がある。   Thereby, the light L11 is reflected by the outer surface 44 and guided in the light guide plate 4 substantially along the arc shape, but the lights L12 and L13 are transmitted by the outer surface 44 of the light guide plate 4 to the inner surface of the light guide plate 4. And is not guided along the arc of the light guide plate 4. Therefore, as shown in FIG. 16, the light L11 is incident on the radial groove 42 substantially perpendicularly, but the lights L12 and L13 are not incident on the radial groove 42 perpendicularly. About light L12 and L13, it cannot reflect in the radial groove 42 and inject | emits perpendicular | vertical with respect to the dial 2, and the light which injected from the entrance plane 41 of the light-guide plate 4 is efficiently made into the front dial 2 There is a problem in that it cannot be guided and luminance spots occur.

特開２００６−１９６１３号公報JP 2006-19613 A

そこで、本発明は、導光板の端面から入射した光を効率的に正面に導くことができ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 can guide the light which injected from the end surface of the light-guide plate to the front efficiently.

上述した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円弧状の透過性の導光板であって、一定間隔で放射状に設けた複数の放射状溝を備えた導光板において、前記複数の放射状溝上を通るように円弧状に設けた円弧状溝をさらに備え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-described problem, is a transparent light guide plate having a circular arc shape in plan view arranged on the back side of the dial, and includes a plurality of radial light guide plates provided at regular intervals. The light guide plate having radial grooves further includes an arc-shaped groove provided in an arc shape so as to pass over the plurality of radial grooves.

請求項２記載の発明は、前記円弧状溝の深さが、前記放射状溝の深さよりも深く設けられていることを特徴とする請求項１に記載の導光板に存する。   The invention according to claim 2 resides in the light guide plate according to claim 1, wherein the depth of the arc-shaped groove is deeper than the depth of the radial groove.

請求項３記載の発明は、前記円弧状溝の数が、前記放射状溝の数よりも少なく設けられていることを特徴とする請求項１又は２に記載の導光板に存する。   The invention according to claim 3 resides in the light guide plate according to claim 1 or 2, wherein the number of the arc-shaped grooves is smaller than the number of the radial grooves.

請求項４記載の発明は、前記複数の放射状溝が、当該導光板の背面に設けられ、前記円弧状溝が、断面四角形状に設けられると共に当該導光板の正面に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 characterized in that the plurality of radial grooves are provided on a back surface of the light guide plate, and the arc-shaped grooves are provided on a front surface of the light guide plate while having a quadrangular cross section. It exists in the light-guide plate of any one of Claims 1-3 to do.

以上説明したように請求項１記載の発明によれば、導光板の端面から入射された光が導光板の外側面や円弧状溝の内側面で反射されて、ほぼ円弧に沿って導光板内を導光するため、放射状溝に垂直に光を入射することができ、導光板の端面から入射した光を効率的に正面に導くことができる。   As described above, according to the first aspect of the present invention, the light incident from the end surface of the light guide plate is reflected by the outer side surface of the light guide plate or the inner side surface of the arc-shaped groove, and is substantially within the light guide plate along the arc. Therefore, light can be incident perpendicularly to the radial grooves, and light incident from the end face of the light guide plate can be efficiently guided to the front.

請求項２及び３記載の発明によれば、輝度斑の改善を図ることができる。   According to the second and third aspects of the invention, it is possible to improve luminance spots.

請求項４記載の発明によれば、導光板正面に設けた円弧状溝を断面四角形状とすることにより放射状溝で反射して導光板の正面から出射される光が円弧状溝で屈折されることがなくそのまま正面に向かって進むので、導光板の端面から入射した光をより効率的に正面に導くことができる。   According to the fourth aspect of the present invention, the arc-shaped groove provided on the front surface of the light guide plate is formed into a quadrangular cross section so that the light reflected from the radial groove and emitted from the front surface of the light guide plate is refracted by the arc-shaped groove. Since it advances toward the front as it is, the light incident from the end face of the light guide plate can be guided to the front more efficiently.

本発明の導光板を組み込んだ計器の一実施形態を示す正面図である。It is a front view which shows one Embodiment of the meter incorporating the light-guide plate of this invention. 図１のＩ−Ｉ線断面図である。It is the II sectional view taken on the line of FIG. 第１実施形態における図２に示す導光板の斜視図である。It is a perspective view of the light-guide plate shown in FIG. 2 in 1st Embodiment. 図３に示す導光板の部分拡大図である。It is the elements on larger scale of the light-guide plate shown in FIG. 図３に示す導光板の外側面及び円弧状溝の内側面で反射された光の経路を示す説明図である。It is explanatory drawing which shows the path | route of the light reflected by the outer surface of the light-guide plate shown in FIG. 3, and the inner surface of a circular-arc-shaped groove | channel. 図３に示す円弧状溝の内側面で反射された光と放射状溝との関係を示す説明図である。It is explanatory drawing which shows the relationship between the light reflected by the inner surface of the circular arc groove shown in FIG. 3, and a radial groove. 導光板に入射される光の経路をシミュレーションして得た結果である。It is the result obtained by simulating the path | route of the light which injects into a light-guide plate. 他の実施形態における導光板の部分拡大図である。It is the elements on larger scale of the light-guide plate in other embodiment. （Ａ）及び（Ｂ）はそれぞれ、第２実施形態における図２に示す導光板の背面図及び正面図である。(A) And (B) is the rear view and front view of a light-guide plate which are respectively shown in FIG. 2 in 2nd Embodiment. 図９に示す導光板の部分拡大図である。It is the elements on larger scale of the light-guide plate shown in FIG. 図９に示す導光板の部分断面図である。It is a fragmentary sectional view of the light-guide plate shown in FIG. （Ａ）及び（Ｂ）はそれぞれ、他の実施形態における導光板の部分拡大図及び断面図である。(A) And (B) is the elements on larger scale and sectional drawing of the light-guide plate in other embodiment, respectively. （Ａ）及び（Ｂ）はそれぞれ、他の実施形態における導光板の部分拡大図及び断面図である。(A) And (B) is the elements on larger scale and sectional drawing of the light-guide plate in other embodiment, respectively. 従来の導光板の一例を示す斜視図である。It is a perspective view which shows an example of the conventional light-guide plate. 図１４に示す導光板の外側面で反射された光の経路を示す説明図である。It is explanatory drawing which shows the path | route of the light reflected by the outer surface of the light-guide plate shown in FIG. 図１４に示す導光板の外側面で反射された光と放射状溝との関係を示す説明図である。It is explanatory drawing which shows the relationship between the light reflected by the outer surface of the light-guide plate shown in FIG. 14, and a radial groove.

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正面図である。図２は、図１のＩ−Ｉ線断面図である。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 front view showing an embodiment of a meter incorporating the light guide plate of the present invention. 2 is a cross-sectional view taken along the line II of FIG. 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、両端部が下垂されていて、その端面にそれぞれ導光板用光源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。   The light guide plate 4 is made of a translucent member such as acrylic resin. As shown in FIG. 3, the light guide plate 4 is provided in an arc shape in plan view along the scale provided on the dial 2. Both ends of the light guide plate 4 are suspended, and an incident surface 41 on which light from the light source L2 for the light guide plate is incident is provided on each end surface. The light source L2 for the light guide plate is disposed so as to face the incident surface 41.

また、導光板４は、図３及び図４に示すように、その背面に一定間隔で放射状に設けた複数の放射状溝４２と、この複数の放射状溝４２上を通って交わるように円弧状に設けた円弧状溝４３と、を備えている。図４に示すように、放射状溝４２は、断面三角形状に設けられている。また、円弧状溝４３は、断面四角形状に設けられていて、深さ幅共に放射状溝４２よりも大きく設けられている。また、円弧状溝４３の数は、放射状溝４２の数よりも少なく設けられていて、本実施形態では２本設けられている。   Further, as shown in FIGS. 3 and 4, the light guide plate 4 has a plurality of radial grooves 42 radially provided on the back surface thereof at regular intervals and an arc shape so as to cross over the plurality of radial grooves 42. And an arcuate groove 43 provided. As shown in FIG. 4, the radial grooves 42 are provided in a triangular cross section. Further, the arc-shaped groove 43 is provided in a quadrangular cross section, and the depth width is larger than that of the radial groove 42. Further, the number of arc-shaped grooves 43 is smaller than the number of radial grooves 42, and two are provided in the present embodiment.

次に、図４〜図７を参照して第１実施形態における導光板４内での導光板用光源Ｌ２から入射される光の経路について説明する。なお、図５については放射状溝４２については省略してある。また、図６については複数の放射状溝４２の１つだけを記載し、他の放射状溝４２については省略してある。導光板光源Ｌ２からの光は、入射面４１から導光板４内に入射される。図５に示すように、入射面４１から導光板４内に入射された光のうち外側面４４側を導光する光Ｌ１１は、導光板４の外側面４４で反射される。また、入射面４１から導光板４内に入射された光のうち外側面４４−内側面４５間中央を導光する光Ｌ１２は、導光板４の外側面４４側に設けた円弧状溝４３の内側面で反射され、入射面４１から導光板４内に入射された光のうち内側面４５側を導光する光Ｌ１３は、導光板４の内側面４５側に設けた円弧状溝４３の内側面で反射される。   Next, a path of light incident from the light source L2 for the light guide plate in the light guide plate 4 in the first embodiment will be described with reference to FIGS. In FIG. 5, the radial grooves 42 are omitted. In FIG. 6, only one of the plurality of radial grooves 42 is illustrated, and the other radial grooves 42 are omitted. Light from the light guide plate light source L2 enters the light guide plate 4 from the incident surface 41. As shown in FIG. 5, the light L <b> 11 that guides the outer surface 44 side of the light incident from the incident surface 41 into the light guide plate 4 is reflected by the outer surface 44 of the light guide plate 4. The light L12 that guides the center between the outer surface 44 and the inner surface 45 out of the light incident on the light guide plate 4 from the incident surface 41 is generated by the arc-shaped groove 43 provided on the outer surface 44 side of the light guide plate 4. Of the light reflected from the inner surface and incident from the incident surface 41 into the light guide plate 4, the light L <b> 13 that guides the inner surface 45 side is inside the arc-shaped groove 43 provided on the inner surface 45 side of the light guide plate 4. Reflected on the side.

このように光Ｌ１２、Ｌ１３を従来のように導光板４の外側面４４ではなく、円弧状溝４３で反射させることにより、光Ｌ１１の外側面４４に対する入射角θ１、光Ｌ１２の円弧状溝４３に対する入射角θ２、及び、光Ｌ１３の円弧状溝４３に対する入射角θ３をほぼ等しくすることができる（θ１≒θ２≒θ３）。よって、外側面４４、円弧状溝４３で反射された光Ｌ１１、Ｌ１２、Ｌ１３をほぼ平行とすることができ、光Ｌ１１、Ｌ１２、Ｌ１３の何れもほぼ円弧状に沿って導光するように導光板４の外側面４４や円弧状溝４３の内側面で反射することができる。   As described above, the light L12 and L13 are reflected not by the outer surface 44 of the light guide plate 4 but by the arc-shaped groove 43 as in the prior art, so that the incident angle θ1 of the light L11 with respect to the outer surface 44 and the arc-shaped groove 43 of the light L12. And the incident angle θ3 of the light L13 with respect to the arc-shaped groove 43 can be made substantially equal (θ1≈θ2≈θ3). Therefore, the lights L11, L12, and L13 reflected by the outer surface 44 and the arc-shaped groove 43 can be made substantially parallel, and all of the lights L11, L12, and L13 are guided so as to be guided along the arc. The light can be reflected from the outer surface 44 of the optical plate 4 and the inner surface of the arc-shaped groove 43.

上述したように円弧状溝４３を設けることにより、入射面４１から入射された光を円弧にほぼ沿って導光するように反射できることは、図７に示すシミュレーション結果からも確認できた。よって、図６に示すように、何れの光Ｌ１１、Ｌ１２、Ｌ１３も放射状溝４２に対してほぼ垂直に入射することができ、図４に示すように光Ｌ１１、Ｌ１２、Ｌ１３を文字板２に対してほぼ垂直に射出することができる。このため、導光板４の入射面４１から入射した光を効率的に正面の文字板２に導くことができる。   As described above, it can be confirmed from the simulation result shown in FIG. 7 that by providing the arc-shaped groove 43, the light incident from the incident surface 41 can be reflected so as to be guided substantially along the arc. Therefore, as shown in FIG. 6, any of the lights L11, L12, and L13 can be incident substantially perpendicularly to the radial groove 42, and the lights L11, L12, and L13 are applied to the dial 2 as shown in FIG. On the other hand, it can be injected almost vertically. For this reason, the light incident from the incident surface 41 of the light guide plate 4 can be efficiently guided to the front dial 2.

ところで、円弧状溝４３は、深さが浅すぎると反射できる光の量が少なくなってしまう。また、円弧状溝４３の数は多すぎると図５に示すように光が円弧状にほぼ沿って導光するように円弧状溝４３で反射させることができない。即ち、円弧状溝４３の深さを浅くし、数を多くすると円弧状溝４３の効果が薄くなってしまう。よって、本実施形態では、円弧状溝４３の深さが、放射状溝４２の深さよりも深く設けられている。また、円弧状溝４３の数が、放射状溝４２の数よりも少なく設けられている。これにより、導光板４の入射面４１から入射した光をより効率的に正面の文字板２に導くことができ、輝度斑の改善を図ることができる。   By the way, if the arc-shaped groove 43 is too shallow, the amount of light that can be reflected is reduced. If the number of arcuate grooves 43 is too large, light cannot be reflected by the arcuate grooves 43 so that light is guided substantially along the arcuate shape as shown in FIG. That is, when the depth of the arc-shaped groove 43 is reduced and the number is increased, the effect of the arc-shaped groove 43 is reduced. Therefore, in this embodiment, the depth of the arc-shaped groove 43 is deeper than the depth of the radial groove 42. Further, the number of arc-shaped grooves 43 is smaller than the number of radial grooves 42. Thereby, the light incident from the incident surface 41 of the light guide plate 4 can be more efficiently guided to the front dial plate 2, and luminance spots can be improved.

なお、上述した第１実施形態では、四角形状であったが、本発明はこれに限ったものではない。例えば、図８（ａ）〜（ｃ）に示すように、台形形状や、三角形状に形成したり曲面に形成したりしても同様の効果を得ることができる。   In addition, in 1st Embodiment mentioned above, although it was square shape, this invention is not limited to this. For example, as shown in FIGS. 8A to 8C, the same effect can be obtained even if the trapezoidal shape, the triangular shape, or the curved surface is formed.

第２実施形態
次に、本発明の第２実施形態を図面に基づいて説明する。第１実施形態と第２実施形態とで大きく異なる点は、導光板４の構造である。第１実施形態では複数の放射状溝４２と円弧状溝４３との双方が導光板４の背面に設けられていたが、第２実施形態では、図９及び図１０に示すように、複数の放射状溝４２を導光板４の背面に設け、円弧状溝４３を導光板４の正面に設けている。第２実施形態の導光板４以外の部分については第１実施形態と同様の構成であるため、ここでは詳細な説明を省略する。 Second Embodiment Next, a second embodiment of the present invention will be described with reference to the drawings. A significant difference between the first embodiment and the second embodiment is the structure of the light guide plate 4. In the first embodiment, both the plurality of radial grooves 42 and the arc-shaped grooves 43 are provided on the back surface of the light guide plate 4, but in the second embodiment, as shown in FIGS. 9 and 10, a plurality of radial grooves 42 are provided. The groove 42 is provided on the back surface of the light guide plate 4, and the arc-shaped groove 43 is provided on the front surface of the light guide plate 4. Since portions other than the light guide plate 4 of the second embodiment have the same configuration as that of the first embodiment, detailed description thereof is omitted here.

同図に示すように、放射状溝４２は、第１実施形態と同様に断面三角形状に設けられている。また、円弧状溝４３も第１実施形態と同様に断面四角形状に設けられていて、深さ幅共に放射状溝４２よりも大きく設けられている。詳しくは、断面四角形状の円弧状溝４３は、正面と平行な底面４３ａと、底面４３ａと直交する一対の側面４３ｂと、から構成されている。   As shown in the figure, the radial grooves 42 are provided in a triangular cross section as in the first embodiment. Further, the arc-shaped groove 43 is also provided with a quadrangular cross-section as in the first embodiment, and the depth width is larger than that of the radial groove 42. Specifically, the arc-shaped groove 43 having a quadrangular cross section includes a bottom surface 43a parallel to the front surface and a pair of side surfaces 43b orthogonal to the bottom surface 43a.

次に、図５、図６及び図１１を参照して第２実施形態における導光板４内での導光板用光源Ｌ２から入射された光の経路について説明する。導光板光源Ｌ２からの光は、入射面４１から導光板４内に入射される。そして、第１実施形態と同様に、図５に示すように、導光板４に入射された光Ｌ１１、Ｌ２２、Ｌ１３は、外側面４４や各円弧状溝４３で反射されて互いに平行にほぼ円弧状に沿って導光する。よって、第１実施形態と同様に、図６に示すように、外側面４４や各円弧状溝４３で反射された光Ｌ１１、Ｌ１２、Ｌ１３は放射状溝４２に対してほぼ垂直に入射する。このように放射状溝４２に対してほぼ垂直に入射された光Ｌは、図１１に示すように、放射状溝４２で導光板４の正面に対してほぼ垂直に反射される。   Next, the path of light incident from the light source L2 for the light guide plate in the light guide plate 4 in the second embodiment will be described with reference to FIGS. Light from the light guide plate light source L2 enters the light guide plate 4 from the incident surface 41. As in the first embodiment, as shown in FIG. 5, the light L11, L22, L13 incident on the light guide plate 4 is reflected by the outer surface 44 and each arcuate groove 43 and is substantially circular in parallel with each other. Light is guided along the arc. Therefore, as in the first embodiment, as shown in FIG. 6, the light L11, L12, L13 reflected by the outer surface 44 and each arcuate groove 43 is incident on the radial groove 42 substantially perpendicularly. Thus, the light L incident on the radial groove 42 substantially perpendicularly is reflected by the radial groove 42 substantially perpendicularly to the front surface of the light guide plate 4 as shown in FIG.

放射状溝４２で反射されて導光板４の正面に対してほぼ垂直な光Ｌは、当然断面四角形状の円弧状溝４３の底面４３ａにも垂直に入射され、しかも側面４３ｂに対しても平行であるため、円弧状溝４３で屈折されることなくそのまま正面に向かって進む。これにより、導光板４の端面から入射した光をより効率的に正面に導くことができる。   The light L reflected by the radial grooves 42 and substantially perpendicular to the front surface of the light guide plate 4 is naturally incident on the bottom surface 43a of the arc-shaped groove 43 having a quadrangular cross section and is also parallel to the side surface 43b. Therefore, the light advances toward the front without being refracted by the arc-shaped groove 43. Thereby, the light incident from the end face of the light guide plate 4 can be guided to the front more efficiently.

なお、上述した第２実施形態では、円弧状溝４３を断面四角形状としていたが、本発明はこれに限ったものではない。例えば、図１２及び図１３に示すように、円弧状溝４３を断面三角形状や曲線形状にすることも考えられる。しかしながら、円弧状溝４３を図１２及び図１３のような形状にすると、放射状溝４２で反射されて導光板４の正面に対してほぼ垂直な光Ｌは、図１２（Ｂ）及び図１３（Ｂ）に示すように、円弧状溝４３の内側面に垂直に入射されなくなるため、円弧状溝４３で屈折されてしまい正面に向かって進まなくなる。従って、第２実施形態に示すように円弧状溝４３の形状を断面四角形状とするのが最適である。   In the second embodiment described above, the arc-shaped groove 43 has a quadrangular cross section, but the present invention is not limited to this. For example, as shown in FIGS. 12 and 13, it is conceivable that the arc-shaped groove 43 has a triangular cross section or a curved shape. However, when the arc-shaped groove 43 is shaped as shown in FIGS. 12 and 13, the light L reflected by the radial grooves 42 and substantially perpendicular to the front surface of the light guide plate 4 is shown in FIGS. As shown in B), since the light does not enter the inner surface of the arc-shaped groove 43 perpendicularly, it is refracted by the arc-shaped groove 43 and does not advance toward the front. Therefore, as shown in the second embodiment, it is optimal that the arc-shaped groove 43 has a quadrangular cross section.

また、上述した第２実施形態では、放射状溝４２を断面三角形状としてたが、本発明はこれに限ったものではない。円弧状溝４３が四角形状であれば、放射状溝４３が四角形状や曲線状、その他種々の形状であっても第２実施形態と同様の効果を得ることができる。   In the second embodiment described above, the radial grooves 42 have a triangular cross section, but the present invention is not limited to this. If the arc-shaped groove 43 has a quadrangular shape, the same effect as in the second embodiment can be obtained even if the radial groove 43 has a quadrangular shape, a curved shape, or other various shapes.

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.

２ 文字板
４ 導光板
４２ 放射状溝
４３ 円弧状溝 2 Dial 4 Light guide plate 42 Radial groove 43 Arc-shaped groove

Claims (4)

文字板の背面側に配置された平面視円弧状の透過性の導光板であって、一定間隔で放射状に設けた複数の放射状溝を備えた導光板において、
前記複数の放射状溝上を通るように円弧状に設けた円弧状溝をさらに備えた
ことを特徴とする導光板。 In a light guide plate having a plurality of radial grooves arranged radially at regular intervals, a transparent light guide plate having a circular arc shape in plan view arranged on the back side of the dial plate,
The light guide plate further comprising an arc-shaped groove provided in an arc shape so as to pass over the plurality of radial grooves. 前記円弧状溝の深さが、前記放射状溝の深さよりも深く設けられている
ことを特徴とする請求項１に記載の導光板。 The light guide plate according to claim 1, wherein a depth of the arc-shaped groove is deeper than a depth of the radial groove. 前記円弧状溝の数が、前記放射状溝の数よりも少なく設けられている
ことを特徴とする請求項１又は２に記載の導光板。 The light guide plate according to claim 1, wherein the number of the arc-shaped grooves is smaller than the number of the radial grooves. 前記複数の放射状溝が、当該導光板の背面に設けられ、
前記円弧状溝が、断面四角形状に設けられると共に当該導光板の正面に設けられた
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。 The plurality of radial grooves are provided on the back surface of the light guide plate,
The light guide plate according to any one of claims 1 to 3, wherein the arc-shaped groove is provided in a square shape in cross section and provided in front of the light guide plate.
JP2010115097A 2009-07-16 2010-05-19 Light guide plate Expired - Fee Related JP5462071B2 (en)

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JP2015005404A (en) * 2013-06-20 2015-01-08 矢崎総業株式会社 Light guide plate and meter
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JP2015005404A (en) * 2013-06-20 2015-01-08 矢崎総業株式会社 Light guide plate and meter
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