JP3738944B2

JP3738944B2 - Pointer illumination device

Info

Publication number: JP3738944B2
Application number: JP37188698A
Authority: JP
Inventors: 勉早川
Original assignee: Nippon Seiki Co Ltd
Current assignee: Nippon Seiki Co Ltd
Priority date: 1998-12-28
Filing date: 1998-12-28
Publication date: 2006-01-25
Anticipated expiration: 2018-12-28
Also published as: JP2000193497A

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば車両用計器に採用される指針照明装置に関し、特に表示板の背後に指針照明用の導光板を備え、この導光板を通じて指針を照明する指針照明装置に関するものである。
【０００２】
【従来の技術】
従来より表示板上で回動する指針を透光材から形成して光導入部を設けると共に表示板の背後に導光板を配置し、この導光板より導いた照明光を表示板の光透過部分を通じて指針の光導入部に供給し、指針自体を光輝させる指針照明装置がよく知られている。
【０００３】
この種の指針照明装置にあっては、指針の光導入部を含む回動中心領域の前方及びその周囲は通常、キャップ状の遮光性カバー（遮光性部材）にて覆われるので、この部分からの光洩れは抑えられるが、遮光性カバーと表示板との間から光洩れが発生することがある。
【０００４】
このため、例えば実公平 6-20097号公報のように、照明光の光導入経路となる表示板の光透過部分周囲に円環状の遮光リングを設け、この遮光リングを遮光性カバーとラップさせて光洩れを抑制する指針照明装置が提案されている。
【０００５】
【発明が解決しようとする課題】
しかしながら、前述のごとく遮光リングを用いて光り漏れを抑制する構造は、単に遮光リングと遮光性カバーとを所定の間隔を空けてラップさせるだけの構造であるため、導光体を通じて指針側に供給される照明光のうち、指針側から反射した照明光が遮光リングと遮光性カバーとの間を通ってダイレクトに表示板表面に漏れやすく、これがハレーションとなって視認され照明品質を低下させてしまうことがあり、この点で改良の余地が残されていた。特にこのような光漏れによるハレーションの発生は、表示板が白色系の色彩を有する場合に目立つため改良が望まれていた。
【０００６】
本発明は、この点に鑑みてなされたもので、その主な目的は、表示板側への光漏れを低減し照明品質を高めることが可能な指針照明装置を提供するものである。
【課題を解決するための手段】
【０００７】
本発明は、前記目的を達成するため、回動中心領域に光導入部を有する透光性の指針本体と前記回動中心領域の前方及びその周囲を覆う遮光性カバーと前記光導入部を貫通もしくは露出する開口部を備え前記回動中心領域を背後から覆う被覆部材とからなる遮光性部材とを備える指針と、この指針の背後に所定距離を隔てて配置され前記光導入部対応部分に透光部を有する表示板と、この表示板の背後に重合配置され前記表示板の透光部を通じて前記指針の光導入部に照明光を供給することにより前記指針を光輝させる光供給部を有する導光板と、前記指針と前記表示板の間に位置して前記表示板側に固定され前記表示板の透光部周縁を覆って前記遮光性部材側に延びる筒状の遮光壁部を有するカラー部材とを備え、前記被覆部材に前記遮光壁部に沿ってその内側に延び前記回動中心領域内に位置する遮光部を設けたことを特徴とする。
【０００９】
また本発明は、前記表示板が白色系の色彩を有することを特徴とするものである。
【００１０】
【発明の実施の形態】
本発明による指針照明装置は、回動中心領域に光導入部を有する指針本体とこの指針本体の回動中心領域を覆う遮光性部材とを備える指針と、この指針の背後に所定距離を隔てて配置され光導入部対応部分に透光部を有する表示板と、この表示板の背後に重合配置され表示板の透光部を通じて指針の光導入部に照明光を供給して指針を光輝させる光供給部を有する導光板と、指針と表示板の間に位置して表示板側に固定され表示板の透光部周縁を覆って遮光性部材側に延びる筒状の遮光壁部を有するカラー部材とで構成されている。遮光性部材には、カラー部材の遮光壁部に沿ってその内側に延びる遮光部が連続的に形成されており、この遮光部が遮光壁部の内側に存在することにより、特に指針側を通じ反射して表示板側に向かう照明光を低減もしくは減衰させ、これにより照明品質を高めることができる。
【００１１】
このような遮光部は、指針の回動中心領域を遮光性部材、例えば、指針本体の回動中心領域の背後を覆う指針座もしくは遮光プレートと称される被覆部材に形成してもよい。遮光性部材に遮光部を連続形成した場合は、指針本体に形成する場合と比較して、多くは特別な処理や加工は必要なく、低コストである。
【００１２】
また本発明のごとき指針照明装置は、白色系の地色部を有する、いわゆる白色文字板に適用すると効果的である。
【００１３】
【実施例】
以下、本発明の実施例を添付図面を用いて説明するが、図１〜図４は本発明による指針照明装置を指針式メータに適用した指針式メータの要部分解斜視図、図は遮光プレート単体を示す斜視図、図３は図１の組み付け状態を示す要部断面図、図４はカラー部材の組付け状態を示す上面図である。
【００１４】
図１において、指針式メータ装置は、指針１と、この指針１の背後に所定距離を有して配置される表示板２と、この表示板２の背後に重合配置される導光板３と、この導光板３と所定距離を有して配置される光源４と、指針１と表示板２との間に配置されるカラー部材５とから構成され、指針１と図示省略した計器本体から伸長する指針軸６とを導光板３，表示板２，カラー部材５を介して連結固定し、前記計器本体の指針軸６の駆動に応じた指針１の軸回り回動により、表示板２に形成された文字，数字，目盛等の図示しない表示意匠部を指示すると共に、光源４の点灯により、指針１を照明できるようになっている。
【００１５】
指針１は、図２に詳しく示すように、ポリカーボネート，アクリル合成樹脂からなる透光性の指針本体１０と、この指針本体１０の回動中心領域Ｒの前方及びその周囲を覆って背後が開口する、黒色系の遮光性合成樹脂からなるキャップ形の遮光性カバー（遮光性部材）１１と、指針本体１０の回動中心領域Ｒの背後に固定され、黒色系の遮光性合成樹脂からなる円盤形の被覆部材（遮光性部材）１２とからなる。
【００１６】
指針本体１０は、その回動中心領域Ｒに、光源４の照明光を内部に採り入れる受光部（光導入部）１３と、この受光部１３より採り入れた照明光を先端側に反射する指針反射部１４と、指針軸６に連結されるボス部１５とを備えている。
【００１７】
被覆部材１２は、遮光性を有する黒色の合成樹脂材料からなり、指針本体１０のボス部１５及び受光部１３を貫通もしくは露出する開口部１６と、カラー部材５の後述する遮光壁部に沿ってその内側に延びるリング状の突出壁からなる遮光部１７を備えている。
【００１８】
表示板２は、透明な合成樹脂パネルからなる基材の表面に、所定色からなり目盛，文字，マーク等を形成する透光性の着色印刷層とこの着色印刷層の周囲を囲むように目盛，文字，マーク等の背景となる地色印刷層とを備え（図示しない）、前記地色印刷層は、本実施例では白色系の着色インクを用いて形成されている。また表示板２は指針軸６及び指針本体１の受光部１３に対応する領域に貫通孔状の透光部２１を備え、この透光部２１は導光板３の後述する延長部が嵌合する大きさに形成され、またその所定箇所には前記延長部の切欠部に係合して表示板２を導光板３に位置決めすると共に、カラー部材５を装着した際、カラー部材５の後述する突出部と導光板３との間に挟まれる突片２２が形成されている。
【００１９】
導光板３は、指針本体１と同様な透光性合成樹脂からなり、指針本体１のボス部１５に対応し指針軸６を貫通させる通孔３１と、この通孔３１の周縁に位置し透光部２１を通じて指針１の受光部１３に光源４の照明光を供給して指針１を光輝させる円錐状の導光板反射部（光供給部）３２と、表示板２の透光部２１に対応して指針本体１側に延びる突出壁からなる延長部３３と、この延長部３３の突片２２及びカラー部材５の係止片に対応する箇所に形成された複数の切欠部３４と、これら切欠部３４のうち、前記係止片に対応する切欠部３４に連通するように形成される貫通部３５とを備え、導光板３に表示板２を配置した際、延長部３３が表示板２の透光部２１を貫通し、またこの際、切欠部３４に表示板２の突片２２が嵌入するようになっている。
【００２０】
カラー部材５は、遮光性を有する黒色の合成樹脂材料からなり、暗色系表示板２の透光部２１を取り巻いてその周縁を覆い且つその先端が遮光性カバーに向けて延びる円環状の遮光壁部５１と、この遮光壁部５１の基端側外周部より透光部２１の周囲に突出して表示板２の表面に当接するフランジ５２と、遮光壁部５１の下端より部分的に指針軸６に沿って伸長し且つその先端に外方へ向けて突出する係合部５３を有するフック状の係止片５４とから構成されている。
【００２１】
そして延長部３３の切欠部３４に突片２２を挿入嵌合して表示板３と導光板４とを重合配置した状態で、透光部２１及び貫通孔３５にカラー部材５の係止片５４を挿入し、係止片５４の係合部５３を導光板３の背面に係合させることにより、表示板２及び導光板３の止着が行われる。そしてカラー部材５の固定，止着状態において遮光壁部５１は、その内壁部が導光板３の延長部３３の外周壁に沿って遮光キャップ１側へ延びるように配置され、またこの遮光壁部５１は、被覆部材１２の遮光部１７と所定間隔を空けて指針軸６のラジアル方向に対向し、略迷路状となる光漏れ抑制部を構成する。
【００２２】
また係止片５４は、係合部５３の反対側に突出リブ状の規制部５５を備え、この規制部５５の先端側には、係止片５４を貫通孔３５に挿入取付できるように傾斜部が形成されており、この傾斜部を通じて係止片５４を貫通孔３５に挿入し、係合部５３を導光板３の背面に係合した際には、規制部の最も突出する当接部が貫通孔３５の内壁面に緩圧入状態で当接するものである。
【００２３】
また遮光壁部５１の基端側内壁部分には、突出壁状の突出部５６が形成されており、この突出部５６は、カラー部材５を固定，止着状態で導光板３の延長部３３に形成した切欠部３４に嵌入されるものであり、これにより表示板２の突片２２を抑えるようになっている。
【００２４】
以上詳述したように、本実施例によれば、回転中心領域Ｒに受光部（光導入部）１３を有する指針本体１０と、この指針本体１０の回動中心領域Ｒを覆う遮光性カバー１１，被覆部材１２でなる遮光性部材とを備える指針１と、この指針１の背後に所定距離を隔てて配置され受光部１３対応部分に透光部２１を有する表示板２と、この表示板２の背後に重合配置され表示板２の透光部２１を通じて指針１の受光部１３に照明光を供給して指針１を光輝させる導光板反射部（光供給部）３２を有する導光板３と、指針１と表示板２の間に位置して表示板２側に固定され表示板２の透光部２１周縁を覆って遮光性部材側に延びる筒状の遮光壁部５１を有するカラー部材５とを備え、被覆部材１２にカラー部材５の遮光壁部５１に沿ってその内側に延びる遮光部１７を連続的に形成したことにより、特に指針１側を通じ反射して表示板２側に向かう照明光を低減もしくは減衰させ、これによりハレーションの発生を抑制して照明品質を高めることができる。
【００２５】
なお本実施例では、遮光部１７を被覆部材１２に形成する例を示したが、指針１（指針本体１０）と指針軸６とを連結する指針座と称される連結部材に遮光部を形成してもよい。
【００２６】
また本実施例のごとく、被覆部材１２からなる遮光性部材に遮光部１７を連続形成する場合は、指針本体に形成する場合と比較して特別な処理や加工が必要なく、低コストを実現できる。
【００２７】
また遮光性カバー１１に遮光部を形成する場合、その多くは遮光性カバー１１の開口側端部を遮光壁部５１の内側に屈曲させることになり、遮光性カバー１１の型成形時に型抜き性の問題が発生するが、遮光性カバー１１自体の肉厚を適度に抑えて弾性を付与すれば、型抜きが可能となる。また遮光性カバー１１に遮光部を形成する場合、第２実施例として図４に示すように周壁状の遮光部１１ａをカラー部材５の遮光壁部５１を挟んで２重に形成して、光漏れ低減作用を高めることもできる。
【００２８】
また本実施例のごとき指針照明装置は、特に表示板として白色系の地色部を有する、いわゆる白色文字板に適用した際に特に有効である。
【００２９】
図５，図６は本発明の第３実施例として、カラー部材５の変形例を示しており、前記第１実施例と同一もしくは均等箇所には同一符号を付してある。
【００３０】
すなわち、本実施例によるカラー部材５は、その材質については前記第１実施例と同じであるが、図５に示すように、カラー部材５を導光板３の止着する係合部５３を遮光壁部５１自体の内側に部分形成したものであり、係合部５３に対応する導光板の延長部３３箇所には、係合部５が係合する横穴形状の被係合部３６が形成され、この被係合部３６にカラー部材５の係合部５３が係合することにより、カラー部材５が表示板２を挟んで導光板３に止着されるようになっている。
【００３１】
また本実施例による延長部３３は、図６に示すように、前面視において、中心Ｃを通って各被係合部３６の中心間を結ぶ径Ｌ１が中心Ｃを通って径Ｌ１と直交する径Ｌ２よりも大きい楕円形状の環状壁からなり、これに対してカラー部材５の遮光壁部５１は、前面視において、延長部３３の径Ｌ１に対応する各係合部５３の中心間の直径と延長部３３の径Ｌ２に対応する直径とが等しい略正円形の環状壁からなり、従ってカラー部材５を導光板３に止着した際には、図６に示すように、遮光壁部５１と延長部３３間には隙間Ｓが形成されるようになっており、カラー部材５の装着時に、カラー部材５を径Ｌ２に対応する方向で中心Ｃに向けて撓ませることにより、カラー部材５の径Ｌ１に対応する方向の径寸法を大きくして、カラー部材５の装着が容易に行えるようになっている。カラー部材５の止着後は、カラー部材５が自身の復元力にて元の形に戻るため、両者の形状に相違による不具合は生じない。
【００３２】
以上のように本実施例では、回転中心領域Ｒに受光部（光導入部）１３を有する指針本体１０と、この指針本体１０の回動中心領域Ｒを覆う遮光性カバー１１，被覆部材１２でなる遮光性部材とを備える指針１と、この指針１の背後に所定距離を隔てて配置され受光部１３対応部分に透光部２１を有する表示板２と、この表示板２の背後に重合配置され表示板２の透光部２１を通じて指針１の受光部１３に照明光を供給して指針１を光輝させる導光板反射部（光供給部）３２を有する導光板３と、指針１と表示板２の間に位置して表示板２上に配置され表示板２の透光部２１周縁を覆って遮光性部材側に延びる筒状の遮光壁部５１を有するカラー部材５とを備え、導光体３に遮光壁部５１の内側に沿って指針１側に延びる延長部３３を形成し、この延長部３３に被係合部３６を形成すると共に遮光壁部５１に被係合部に係合する係合部５３を形成したことにより、係合部５３の変形や変位を抑制し、カラー部材５の取り付け強度を高めることができる。
【００３３】
すなわち、導光板３との係合部５３を前記第１実施例のごとく指針軸６に沿って背後に延びる係止片５４の先端に形成した場合、その形成部たる係止片５４は、熱やそれ自体の変形容易性により変形もしくはその位置が変位しやすく、このためカラー部材５の装着状態においてカラー部材５と導光体３との間にがたつきが生じて満足な光漏れ作用が得られなかったり、表示板２，導光板３どうしの満足のいく止着強度が得られないことがあり、この点で改良の余地が残されていたものであるが、前述のごとく、係合部５３をリング状を有し且つフランジ部５２が補強部としても機能する遮光壁部５１に形成したことにより、係合部５３の変形や変位を抑制することができ、これによりカラー部材５の取り付け安定性を向上させ、光漏れ抑制機能や表示板２，導光板３どうしの止着性を高めることができる。
【００３４】
また本実施例では、カラー部材５の遮光壁部５１と導光板３の延長部３３との間に間隙Ｓを形成したことにより、カラー部材５の装着作業性を高めることができる。
【００３５】
【発明の効果】
以上詳述したように、回動中心領域に光導入部を有する透光性の指針本体と前記回動中心領域の前方及びその周囲を覆う遮光性カバーと前記光導入部を貫通もしくは露出する開口部を備え前記回動中心領域を背後から覆う被覆部材とからなる遮光性部材とを備える指針と、この指針の背後に所定距離を隔てて配置され前記光導入部対応部分に透光部を有する表示板と、この表示板の背後に重合配置され前記表示板の透光部を通じて前記指針の光導入部に照明光を供給することにより前記指針を光輝させる光供給部を有する導光板と、前記指針と前記表示板の間に位置して前記表示板側に固定され前記表示板の透光部周縁を覆って前記遮光性部材側に延びる筒状の遮光壁部を有するカラー部材とを備え、前記被覆部材に前記遮光壁部に沿ってその内側に延び前記回動中心領域内に位置する遮光部を設けたことにより、表示板側への光漏れを低減し照明品質を高めることが可能な指針照明装置を提供することができる。
【００３７】
また本発明は、前記表示板が白色系の色彩を有するタイプの指針照明装置に特に有効である。
【図面の簡単な説明】
【図１】本発明の第１実施例を示す要部分解斜視図
【図２】図１の要部断面図。
【図３】被覆部材を示す斜視図。
【図４】本発明の第２実施例を示す要部断面図。
【図５】本発明の第３実施例を示す要部断面図。
【図６】図５におけるカラー部材の取り付け状態を示す正面図。
【符号の説明】
１指針
２表示板
３導光板
５カラー部材
１０指針本体
１１遮光性カバー（遮光性部材）
１２被覆部材（遮光性部材）
１３受光部（光導入部）
１７遮光部
２１透光部
３２導光板反射部（光供給部）
５１遮光壁部
Ｒ回転中心領域[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pointer illumination device employed in, for example, a vehicle instrument, and more particularly to a pointer illumination device that includes a light guide plate for pointer illumination behind a display plate and illuminates the pointer through the light guide plate.
[0002]
[Prior art]
Conventionally, a pointer that rotates on the display board is formed from a translucent material, a light introduction part is provided, and a light guide plate is disposed behind the display board, and illumination light guided from the light guide plate is transmitted through a light transmitting portion of the display board. There is well known a pointer illumination device that supplies a light to the pointer through the light guide and shines the pointer itself.
[0003]
In this type of pointer illumination device, the front and surroundings of the rotation center region including the light guide portion of the pointer are usually covered with a cap-shaped light-shielding cover (light-shielding member). Although light leakage is suppressed, light leakage may occur between the light shielding cover and the display panel.
[0004]
For this reason, for example, as in Japanese Utility Model Publication No. 6-20097, an annular light shielding ring is provided around the light transmitting portion of the display plate, which serves as a light introduction path for illumination light, and this light shielding ring is wrapped with a light shielding cover. A pointer illumination device that suppresses light leakage has been proposed.
[0005]
[Problems to be solved by the invention]
However, as described above, the structure that suppresses light leakage using the light shielding ring is simply a structure that wraps the light shielding ring and the light shielding cover with a predetermined interval, and is supplied to the pointer side through the light guide. Of the illuminating light, the illuminating light reflected from the pointer side is likely to leak directly to the surface of the display plate through the space between the light shielding ring and the light shielding cover, which is viewed as halation and degrades the illumination quality There was still room for improvement in this regard. In particular, the occurrence of halation due to light leakage is conspicuous when the display panel has a white color, so that improvement has been desired.
[0006]
The present invention has been made in view of this point, and its main object is to provide a pointer illumination device capable of reducing light leakage to the display panel side and improving illumination quality.
[Means for Solving the Problems]
[0007]
In order to achieve the above object, the present invention provides a light-transmitting pointer main body having a light introduction portion in the rotation center region, a light-shielding cover that covers the front and the periphery of the rotation center region, and the light introduction portion. Alternatively, a pointer provided with a light shielding member including a covering member that includes an exposed opening and covers the rotation center region from the back, and is disposed behind the pointer at a predetermined distance and is transmitted through the light introduction portion corresponding portion. A display plate having a light portion and a light supply portion that is arranged behind the display plate and that illuminates the pointer by supplying illumination light to the light introduction portion of the pointer through the light transmitting portion of the display plate. A color plate having a cylindrical light-shielding wall portion positioned between the pointer and the display plate, fixed to the display plate side and covering a light-transmitting portion periphery of the display plate and extending to the light-shielding member side. Provided with the light shielding to the covering member Characterized in that a light shielding portion positioned in the turning center region extends inside along the section.
[0009]
Further, the present invention is characterized in that the display panel has a white color.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Pointer illuminating apparatus according to the present invention, a guidance and a light-shielding member to guide body having a light introducing part in rotation the central region to cover the rotation center region of the pointer body, at a predetermined distance behind the guide A display board that is arranged and has a light-transmitting part corresponding to the light-introducing part, and light that superimposes behind the display board and supplies illumination light to the light-introducing part of the pointer through the light-transmitting part of the display board to make the pointer shine A light guide plate having a supply portion, and a color member having a cylindrical light shielding wall portion that is positioned between the pointer and the display plate, is fixed to the display plate side, covers the periphery of the light transmitting portion of the display plate, and extends to the light shielding member side. It is configured. The light-shielding member is continuously formed with a light-shielding portion extending inward along the light-shielding wall portion of the color member, and this light-shielding portion is present inside the light-shielding wall portion, so that it reflects particularly through the pointer side. Thus, the illumination light traveling toward the display panel can be reduced or attenuated, thereby improving the illumination quality.
[0011]
Such a light-shielding part may be formed in a cover member called a light-shielding member, for example, a pointer seat or a light-shielding plate that covers the back of the center of rotation of the pointer main body. When the light-shielding part is continuously formed on the light-shielding member, in many cases, no special processing or processing is required and the cost is low as compared with the case where the light-shielding part is formed on the pointer main body.
[0012]
The pointer illumination device as in the present invention is effective when applied to a so-called white dial having a white background color portion.
[0013]
【Example】
Embodiments of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 to 4 are exploded perspective views of a main part of a pointer type meter in which the pointer illumination device according to the present invention is applied to a pointer type meter. 3 is a perspective view showing a single body, FIG. 3 is a cross-sectional view of the main part showing the assembled state of FIG. 1, and FIG. 4 is a top view showing the assembled state of the collar member.
[0014]
In FIG. 1, a pointer-type meter device includes a pointer 1, a display plate 2 disposed with a predetermined distance behind the pointer 1, and a light guide plate 3 superposed and disposed behind the display plate 2, The light source 4 is arranged with a predetermined distance from the light guide plate 3 and the collar member 5 is arranged between the pointer 1 and the display plate 2 and extends from the pointer 1 and an instrument body (not shown). The indicator shaft 6 is formed on the display plate 2 by connecting and fixing the indicator shaft 6 via the light guide plate 3, the display plate 2 and the collar member 5, and turning around the axis of the indicator 1 according to the driving of the indicator shaft 6 of the instrument body. In addition to indicating a display design portion (not shown) such as letters, numbers, and scales, the pointer 1 can be illuminated by turning on the light source 4.
[0015]
As shown in detail in FIG. 2, the pointer 1 covers a transparent pointer main body 10 made of polycarbonate and acrylic synthetic resin, and the front and the periphery of the rotation center region R of the pointer main body 10 so that the back is open. , A cap-shaped light-shielding cover (light-shielding member) 11 made of a black-colored light-shielding synthetic resin, and a disk shape made of a black-colored light-shielding synthetic resin, fixed behind the rotation center region R of the pointer body 10 And a covering member (light-shielding member) 12.
[0016]
The pointer main body 10 has a light receiving portion (light introducing portion) 13 for incorporating the illumination light of the light source 4 in the rotation center region R, and a pointer reflecting portion for reflecting the illumination light taken from the light receiving portion 13 to the tip side. 14 and a boss portion 15 connected to the pointer shaft 6 .
[0017]
The covering member 12 is made of a black synthetic resin material having a light shielding property, and extends along an opening portion 16 that penetrates or exposes the boss portion 15 and the light receiving portion 13 of the pointer main body 10 and a light shielding wall portion described later of the color member 5. The light-shielding part 17 which consists of a ring-shaped protrusion wall extended in the inside is provided.
[0018]
The display board 2 has a translucent colored printing layer having a predetermined color and forming a scale, characters, marks, etc. on the surface of a base material made of a transparent synthetic resin panel, and a scale so as to surround the colored printing layer. , Characters, marks, and other ground color print layers (not shown). The ground color print layers are formed using white colored ink in this embodiment. The display plate 2 includes a through-hole-shaped light transmitting portion 21 in a region corresponding to the pointer shaft 6 and the light receiving portion 13 of the pointer main body 1, and the light transmitting portion 21 is fitted with an extension portion described later of the light guide plate 3. The display panel 2 is positioned at the light guide plate 3 by engaging with the notch of the extension at a predetermined location, and when the collar member 5 is mounted, the projection of the collar member 5 which will be described later. A protruding piece 22 sandwiched between the portion and the light guide plate 3 is formed.
[0019]
The light guide plate 3 is made of a light-transmitting synthetic resin similar to that of the pointer main body 1, and corresponds to the boss portion 15 of the pointer main body 1 and penetrates the pointer shaft 6, and is positioned at the periphery of the through hole 31 to transmit light. Corresponding to the conical light guide plate reflecting portion (light supply portion) 32 for supplying the illumination light of the light source 4 to the light receiving portion 13 of the pointer 1 through the light portion 21 to make the pointer 1 shine, and the light transmitting portion 21 of the display plate 2 And a plurality of cutouts 34 formed at locations corresponding to the protrusions 22 of the extension 33 and the locking pieces of the collar member 5. The portion 34 includes a through portion 35 formed so as to communicate with the cutout portion 34 corresponding to the locking piece. When the display plate 2 is disposed on the light guide plate 3, the extension portion 33 is formed on the display plate 2. At this time, the projecting piece 22 of the display panel 2 is inserted into the notch 34. You have me.
[0020]
The color member 5 is made of a black synthetic resin material having a light shielding property, and surrounds the translucent portion 21 of the dark color display panel 2 so as to cover the periphery thereof, and the tip thereof extends toward the light shielding cover. Part 51, a flange 52 projecting from the outer peripheral part on the base end side of the light shielding wall part 51 around the translucent part 21 and contacting the surface of the display panel 2, and the pointer shaft 6 partially from the lower end of the light shielding wall part 51 And a hook-like locking piece 54 having an engaging portion 53 protruding outward at the tip thereof.
[0021]
The protruding piece 22 is inserted and fitted into the cutout portion 34 of the extension portion 33 so that the display plate 3 and the light guide plate 4 are arranged in an overlapping manner, and the locking piece 54 of the color member 5 is inserted into the light transmitting portion 21 and the through hole 35. Is inserted, and the engaging portion 53 of the locking piece 54 is engaged with the back surface of the light guide plate 3, whereby the display plate 2 and the light guide plate 3 are fixed. When the collar member 5 is fixed and fastened, the light shielding wall 51 is disposed such that the inner wall extends to the light shielding cap 1 side along the outer peripheral wall of the extension 33 of the light guide plate 3. Reference numeral 51 denotes a light leakage suppressing portion that is opposed to the light shielding portion 17 of the covering member 12 in the radial direction of the pointer shaft 6 at a predetermined interval and has a substantially labyrinth shape.
[0022]
Further, the locking piece 54 includes a protruding rib-shaped restricting portion 55 on the opposite side of the engaging portion 53, and the locking piece 54 is inclined so that the locking piece 54 can be inserted and attached to the through hole 35 on the tip side of the restricting portion 55. When the engaging piece 54 is inserted into the through hole 35 through the inclined portion and the engaging portion 53 is engaged with the back surface of the light guide plate 3, the contact portion that protrudes most of the restricting portion is formed. Is in contact with the inner wall surface of the through-hole 35 in a slowly press-fitted state.
[0023]
Further, a protruding wall-like protruding portion 56 is formed on the inner wall portion on the proximal end side of the light shielding wall portion 51, and the protruding portion 56 is an extension portion 33 of the light guide plate 3 with the collar member 5 fixed and fixed. The protrusions 22 of the display board 2 are suppressed by being inserted into the notches 34 formed in the above.
[0024]
As described above in detail, according to the present embodiment, the pointer main body 10 having the light receiving portion (light introducing portion) 13 in the rotation center region R, and the light-shielding cover 11 that covers the rotation center region R of the pointer main body 10. , A pointer 1 having a light-shielding member made of a covering member 12, a display plate 2 disposed behind the pointer 1 at a predetermined distance and having a light-transmitting portion 21 corresponding to the light receiving portion 13, and the display plate 2 A light guide plate 3 having a light guide plate reflecting portion (light supply portion) 32 that is arranged in the back of the display plate 2 and supplies illumination light to the light receiving portion 13 of the pointer 1 through the light transmitting portion 21 of the display plate 2 to make the pointer 1 shine; A collar member 5 having a cylindrical light-shielding wall portion 51 that is positioned between the pointer 1 and the display plate 2 and is fixed to the display plate 2 side and covers the periphery of the light-transmitting portion 21 of the display plate 2 and extends to the light-shielding member side. On the inside of the covering member 12 along the light shielding wall 51 of the collar member 5. The continuous light shielding portion 17 is formed, so that the illumination light that is reflected through the pointer 1 side and directed toward the display panel 2 side is reduced or attenuated, thereby suppressing the occurrence of halation and improving the illumination quality. it can.
[0025]
In this embodiment, the light shielding portion 17 is formed on the covering member 12. However, the light shielding portion is formed on a connecting member called a pointer seat that connects the pointer 1 (pointer body 10) and the pointer shaft 6. and even good.
[0026]
Further, as in the present embodiment, when the light shielding portion 17 is continuously formed on the light shielding member made of the covering member 12, no special processing or processing is required as compared with the case where the light shielding portion 17 is formed on the pointer main body, and low cost can be realized. .
[0027]
Further, in the case where the light shielding portion is formed in the light shielding cover 11, in many cases, the opening side end portion of the light shielding cover 11 is bent toward the inner side of the light shielding wall portion 51. However, if the thickness of the light-shielding cover 11 itself is moderately suppressed to give elasticity, the die can be removed. Further, when the light shielding portion is formed on the light shielding cover 11, as shown in FIG. 4 as a second embodiment, the light shielding portion 11a having a peripheral wall shape is formed in a double manner with the light shielding wall portion 51 of the color member 5 interposed therebetween. It is also possible to enhance the leakage reducing action.
[0028]
Further, the pointer illumination device as in the present embodiment is particularly effective when applied to a so-called white dial plate having a white background color portion as a display plate.
[0029]
5 and 6 show a modification of the collar member 5 as a third embodiment of the present invention, and the same or equivalent portions as those in the first embodiment are denoted by the same reference numerals.
[0030]
That is, the color member 5 according to the present embodiment is the same as that of the first embodiment in the material, but as shown in FIG. 5, the engaging portion 53 for fixing the collar member 5 to the light guide plate 3 is shielded from light. A part formed on the inner side of the wall part 51 itself is formed at a portion 33 of the extension part of the light guide plate corresponding to the engaging part 53. The engaging portion 53 of the collar member 5 is engaged with the engaged portion 36, so that the collar member 5 is fixed to the light guide plate 3 with the display plate 2 interposed therebetween.
[0031]
Further, in the extension portion 33 according to the present embodiment, as shown in FIG. 6, the diameter L1 connecting the centers of the engaged portions 36 through the center C is perpendicular to the diameter L1 through the center C in the front view. The light shielding wall portion 51 of the collar member 5 has a diameter between the centers of the engaging portions 53 corresponding to the diameter L1 of the extension portion 33 in the front view, which is composed of an elliptical annular wall larger than the diameter L2. And the diameter of the extension portion 33 corresponding to the diameter L2 of the extension portion 33 is substantially equal to a circular wall. Therefore, when the collar member 5 is fixed to the light guide plate 3, as shown in FIG. A gap S is formed between the extension member 33 and the collar member 5 by bending the collar member 5 toward the center C in a direction corresponding to the diameter L2 when the collar member 5 is mounted. The diameter dimension in the direction corresponding to the diameter L1 of the Wear is so easily. After the collar member 5 is fixed, the collar member 5 returns to its original shape by its own restoring force.
[0032]
As described above, in this embodiment, the pointer main body 10 having the light receiving portion (light introducing portion) 13 in the rotation center region R, the light-shielding cover 11 and the covering member 12 covering the rotation center region R of the pointer main body 10. A pointer 1 having a light-shielding member, a display plate 2 disposed behind the pointer 1 at a predetermined distance and having a light-transmitting portion 21 corresponding to the light-receiving portion 13, and a superposed arrangement behind the display plate 2 The light guide plate 3 having a light guide plate reflecting portion (light supply portion) 32 for supplying illumination light to the light receiving portion 13 of the pointer 1 through the light transmitting portion 21 of the display plate 2 to make the pointer 1 shine, and the pointer 1 and the display plate And a color member 5 having a cylindrical light-shielding wall portion 51 that is disposed on the display plate 2 and is disposed on the display plate 2 and covers the periphery of the light-transmitting portion 21 of the display plate 2 and extends toward the light-shielding member. An extension 33 is formed on the body 3 so as to extend toward the pointer 1 along the inside of the light shielding wall 51. By forming the engaged portion 36 in the extension portion 33 and the engaging portion 53 engaging with the engaged portion in the light shielding wall portion 51, deformation and displacement of the engaging portion 53 are suppressed, and the collar The attachment strength of the member 5 can be increased.
[0033]
That is, when the engaging portion 53 with the light guide plate 3 is formed at the tip of the engaging piece 54 extending rearward along the pointer shaft 6 as in the first embodiment, the engaging piece 54 as the forming portion Due to the ease of deformation of itself or its position, its deformation or its position is likely to be displaced. For this reason, when the collar member 5 is mounted, rattling occurs between the collar member 5 and the light guide 3 and a satisfactory light leakage effect is obtained. May not be obtained, or a satisfactory fastening strength between the display plate 2 and the light guide plate 3 may not be obtained, and there remains room for improvement in this respect. By forming the portion 53 in the light-shielding wall portion 51 having a ring shape and the flange portion 52 also functioning as a reinforcing portion, deformation and displacement of the engaging portion 53 can be suppressed. Improves mounting stability and suppresses light leakage And display panel 2, it is possible to improve the fastening of to what the light guide plate 3.
[0034]
Further, in this embodiment, the gap S is formed between the light shielding wall portion 51 of the color member 5 and the extension portion 33 of the light guide plate 3, so that the mounting workability of the color member 5 can be improved.
[0035]
【The invention's effect】
As described above in detail, the transparent pointer main body having the light introduction portion in the rotation center region, the light shielding cover covering the front and the periphery of the rotation center region, and the opening penetrating or exposing the light introduction portion. has a pointer and a light-shielding member consisting of a covering member covering the rotation center region from behind with a part, the light transmitting portion to the light introducing portion corresponding portion is disposed at a predetermined distance behind the guide A light guide plate having a display plate, and a light supply unit that is arranged behind the display plate and illuminates the pointer by supplying illumination light to the light introduction portion of the pointer through a light transmitting portion of the display plate, A collar member that is positioned between the pointer and the display plate and is fixed to the display plate side and has a cylindrical light shielding wall portion that covers the periphery of the light transmitting portion of the display plate and extends toward the light shielding member side, The member is moved along the light shielding wall. By providing the light shielding portion positioned in the turning center region extending inwardly, it is possible to provide a pointer illuminating apparatus capable of enhancing the illumination quality reducing leakage of light into the display panel side.
[0037]
The present invention is particularly effective for a pointer illumination device of the type in which the display plate has a white color.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a main part of a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the main part of FIG.
FIG. 3 is a perspective view showing a covering member.
FIG. 4 is a cross-sectional view of a main part showing a second embodiment of the present invention.
FIG. 5 is a cross-sectional view of an essential part showing a third embodiment of the present invention.
6 is a front view showing an attached state of the collar member in FIG. 5. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pointer 2 Display board 3 Light guide plate 5 Color member 10 Pointer main body 11 Light-shielding cover (light-shielding member)
12 Covering member (light-shielding member)
13 Light receiving part (light introducing part)
17 light shielding part 21 light transmission part 32 light guide plate reflection part (light supply part)
51 Shading Wall R Rotation Center Area

Claims

The rotation center includes a translucent pointer main body having a light introduction portion in a rotation center region, a light-shielding cover that covers the front and the periphery of the rotation center region, and an opening that penetrates or exposes the light introduction portion. A pointer provided with a light-shielding member comprising a covering member covering the region from behind, a display plate disposed behind the pointer at a predetermined distance and having a light transmitting portion corresponding to the light introducing portion, and the display plate A light guide plate having a light supply portion that is arranged behind the display plate and illuminates the pointer by supplying illumination light to the light introduction portion of the pointer through the light transmitting portion of the display plate, and is positioned between the pointer and the display plate And a collar member having a cylindrical light shielding wall portion that is fixed to the display plate side and covers the periphery of the light transmitting portion of the display plate and extends to the light shielding member side. The rotation extending along its inside Pointer illuminating apparatus characterized in that a light-shielding portion located heart region.

The pointer illumination device according to claim 1, wherein the display plate has a white color.