JP2004117162A

JP2004117162A - Measuring instrument device

Info

Publication number: JP2004117162A
Application number: JP2002280880A
Authority: JP
Inventors: Kenji Aono; 青野　賢司
Original assignee: Nippon Seiki Co Ltd
Current assignee: Nippon Seiki Co Ltd
Priority date: 2002-09-26
Filing date: 2002-09-26
Publication date: 2004-04-15
Anticipated expiration: 2022-09-26
Also published as: JP3633917B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a measuring instrument device allowing uniform transmissive lighting of a display panel at its almost all surface. <P>SOLUTION: The measuring instrument device comprises a circuit board 1, an instrument body 3 mounted on the reverse side of the circuit board 1 and having a turning shaft 2 extending frontward through the circuit board 1, a pointer 5 fixed to the front end of the turning shaft 2, the display panel 7 arranged behind the pointer 5 and having a display part 6 corresponding to the operation of the pointer 5, a diffusion plate 8 arranged behind the display panel 7, a light emitting diode 9 arranged on the circuit board 1 around the turning shaft 2, and a case member 10 arranged between the display panel 7 and the circuit board 1. The case member 10 has a first reflection part 23 arranged between the diffusion plate 8 and the light emitting diode 9 in opposition to the light emitting diode 9 while encircling the turning shaft 1 and a second reflection part 24 arranged between the diffusion plate 8 and the circuit board 1 while encircle the light emitting diode 9. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば車両に搭載される計器装置に関し、特に表示板の後方に拡散板を備えた計器装置に関するものである。
【０００２】
【従来の技術】
この種の計器装置は、回路基板１を貫通して前方に延びる駆動軸２を有する計器本体３を回路基板１の裏面側に導通固定し、駆動軸２の先端側に指針４を装着し、この指針４と回路基板１との間に前面パネル５（表示板）を配置し、駆動軸２周囲の回路基板１上に光源６，６２を配置し、前面パネル５と回路基板１との間に第１の反射部７５と第２の反射部７７を有する反射体７を配置したものである（例えば、特許文献１参照）。なお、上述した符号は特許文献１で用いられている符号である。
【０００３】
この様な構成において、光源６，６２が発光すると、その照明光の一部は反射体７の第１の反射部７５に反射して第２の反射部７７側に導かれ、第２の反射部７７に到達した照明光は第２の反射部７７に反射して更に前面パネル５側に導かれて、前面パネル５に設けられた表示部５２が明るくしかも均一に透過照明されるものである。
【０００４】
【特許文献１】
特開２００１−９９６８５号公報（図４、図７）
【０００５】
【発明が解決しようとする課題】
しかしながら、前記従来例において透過照明可能な表示部を指針４を構成するカバー４２周囲の前面パネル５（表示板）箇所にも設けた場合、あるいは光源６，６２が点灯した際に表示部５２を除いた地色部５１が透過して表示部５２がシルエットで視認されるように前面パネル５を形成した場合に、光源６，６２を点灯させることによって、カバー４２周囲の表示部あるいはカバー４２周囲の地色部５１箇所に第１の反射部７５の影が発生して明るく均一に透過照明しないといった事象が生じる。
【０００６】
本発明はこの様な点に鑑みなされたもので、表示板のほぼ全面を均一に透過照明可能な計器装置を提供することを目的とする。
【０００７】
【課題を解決するための手段】
本発明は前記課題を解決するため、回路基板と、この回路基板の裏面側に装着され前記回路基板を貫通して前方に延びる回動軸を有する計器本体と、前記回動軸の先端側に固着される指針と、この指針の後方に配置され前記指針の動作に対応する表示部を有する表示板と、この表示板の後方に配置される拡散板と、前記回動軸周囲の前記回路基板に配置される光源と、前記表示板と前記回路基板との間に配置されるケース部材とを備え、前記ケース部材は前記拡散板と前記光源との間に前記回動軸を取り巻くように前記光源と対向して配置される第１の反射部と、前記拡散板と前記回路基板との間に前記光源を取り巻くように配置される第２の反射部とを有するものである。
【０００８】
また、前記拡散板を前記表示板との間に空間を設けて配置したものである。
【０００９】
また、前記拡散板は中心側が前記第１の反射部に、周縁側が前記第２の反射部に保持されているものである。
【００１０】
【発明の実施の形態】
本発明を車両用の計器装置を実施形態として説明する。図１は計器装置の断面を示し、図２は表示板の部分断面を示す。図３は計器装置に備えられる拡散板の正面図であり、図４は拡散板がケース部材に保持された状態を示す部分断面詳細図である。
【００１１】
計器装置は、回路基板１と、この回路基板１の裏面側に回路基板１と導通状態で装着され、回路基板１を貫通して前方に延びる回動軸２を有する例えば回転計用の計器本体３と、回動軸２の先端側に固着される指針軸４を有する指針５と、この指針５の後方に配置され指針５の動作に対応する表示部６を設けた表示板７と、この表示板７の後方に配置される拡散板８と、回動軸２周囲の回路基板１上に配置された光源としての発光ダイオード９と、表示板７と回路基板１との間に配置されたケース部材１０とを備えている。
【００１２】
また、回路基板１の裏面側を覆うカバー１１と、表示板７の前方側に配置され表示板７の可視領域を定める開口部１２を有する覆い部材１３と、指針５や表示板７などの前方側を覆う無色透明な透視板１４を備えている。１５は計器本体３を構成する部品の一部である本体枠（図示せず）から延設された中空状の筒部であり、回動軸２が挿通され、筒部１５の先端側で回動軸２を支持している。
【００１３】
指針５は、指針軸４と一体形成された例えば赤色の合成樹脂からなる指示部１６と、この指示部１６の基部（指針軸４の上方）周囲を覆う黒色の合成樹脂からなる指針キャップ１７を備えている。この指針５は指針軸４を計器本体３の回動軸２の先端側に圧入することによって計器本体３に固着されている。
【００１４】
表示板７には、指針５の指示部１６の指示対象となる例えば車両のエンジン回転数を現す目盛，数字などの表示部６が設けてある。この表示板７は図２に示す様に、無色透明な基板１８の表面に例えば白色の透過性着色層１９を印刷して地部２０を形成し、この地部２０の表面に例えば黒色の表示層２１を印刷して表示部６を形成する。また、表面側には透過性着色層１９および表示層２１を保護すると共に、外光による反射を抑えるための無色透明な保護層２２が設けてある。
【００１５】
回路基板１は硬質な基板からなり、裏面側に計器本体３が導通状態で装着され、この計器本体３を駆動する電子部品（図示せず）などとともに、回動軸２周囲には表示板７を透過照明するための例えば白色で発光する発光ダイオード９が実装されている。
【００１６】
ケース部材１０は遮光性のある白色の合成樹脂からなり、拡散板８と発光ダイオード９との間に回動軸２（筒部１５）を取り巻くように発光ダイオード９と対向して配置される第１の反射部２３と、拡散板８と回路基板１との間に発光ダイオード９を取り巻くように配置される第２の反射部２４を備えている。第１の反射部２３には第１の反射面２５が設けてあり、この第１の反射面２５は発光ダイオード９から受けた光を第２の反射部２４側に反射させる（導く）ように、回路基板１面に対しておおよそ４５度に傾斜させてある。
【００１７】
第２の反射部２４には、第１の反射面２５で反射した光を拡散板８側に反射させるように第２の反射面２６が設けてある。この第２の反射面２６は発光ダイオード９の近くは回路基板１と平行な平面であるが、発光ダイオード９から遠ざかるに従って、回路基板１側から拡散板８の周囲側に接近するように傾斜した曲面（傾斜曲面）としてある。この傾斜した面は曲面に限らず平面でも良い。あるいは平面と曲面を組み合わせたものでも良い。なお、第１の反射部２３と第２の反射部２４とは図示しない箇所で連結されて一体となっている。
【００１８】
また、本実施形態におけるケース部材１０には、第１の反射部２３の前方（表示板７）側に指針軸４あるいは回動軸２を取り巻くように円形の筒状部２７が一体に設けてある。この筒状部２７の先端側には表示板７の貫通孔周縁が支持される第１の載置面２８が設けてある。また、筒状部２７は第１の反射部２３と連なっており、筒状部２７より径大である第１の反射部２３には第２の載置面２９が設けてある。また、ケース部材１０には前面部３０を備えており、表示板７は第１の載置面２８と前面部３０とに載置されて保持されている。この様に、ケース部材１０は発光ダイオード９の光を反射させる反射部材であるとともに、表示板７を保持する保持部材としての役目も果たしている。
【００１９】
透過性の乳白材からなる拡散板８は、図３に示す様に中央部にケース部材１０の筒状部２７の外径とほぼ一致する丸穴３１を有する略ドーナツ状としてある。また、丸穴３１の周縁部には１個の溝孔３２が設けてある。この溝孔３２に筒状部２７の周囲に設けた突起（図示せず）が挿入されて拡散板８の回り止め（回転方向の位置決め）となるものである。
【００２０】
拡散板８の表示板７側の表面にはシボ（微細な凹凸）が施してある。このシボは表示板７の裏面側でも良いし、シボに代えて、例えば微粒子が混入された透明または半透明層を印刷または塗布するようにしても良く、要は拡散板８内に入射した光が拡散されて出射されるような処理が施されていれば良い。また、図示しないが裏面側には白色の透過層が印刷してある。また、周縁には３個の舌片３３が突設してある。
【００２１】
図４は拡散板８がケース部材１０に保持された状態を示す。拡散板８は丸穴３１周縁が第２の載置面２９に載置され、本実施形態の場合は両面接着テープ（図示せず）によって第２の載置面２９に固着されている。また、拡散板８の周縁に突設した舌片３３は第２の反射部２４に設けた支持穴３４内に挿入され、舌片３３の表面側が支持穴３４の切り口面３５に接している。この様に拡散板８は中心側が第１の反射部２３に設けた第２の載置面２９によって保持され、周縁側が第２の反射部２４に設けた支持穴３４に保持された状態でケース部材１０に装着されている。
【００２２】
この様に構成された計器装置において、夜間時あるいは薄暮時に発光ダイオード９を点灯させることによって、照明光は第１の反射面２５で反射して第２の反射部２４側に向かい、第２の反射面２６で反射して拡散板８側に向かう。そして、拡散板８の裏面を照射した光は裏面側に設けられた白色印刷層で反射する光と、拡散板８を透過する光に分けられ、透過した光は表示板７の裏面を照射する。光が拡散板８を透過する際、拡散板８が透過性の乳白材であることに加え、表面にシボが設けてあることによって光は拡散されて表示板７側に向かう。
【００２３】
一方、白色印刷層で反射した光は第２の反射面２６で反射して拡散板８側に向かい、反射を繰り返すか、拡散板８を透過する。なお、全ての光が拡散板８を透過した後表示板７に向かうものではなく、第２の反射面２６で反射した光が拡散板８と第２の反射部２４との隙間を抜けて表示板７側に向かう光もある。
【００２４】
上述した様に、表示板７側に向かった光は表示板７の裏面全体をほぼ均一に照射する。従って、表示板７の地部２０が白色でほぼ均一に透過照明され、表示部６が黒色で（シルエットとして）表示される。また、指針５も背後から明るい光を受けてシルエットとして視認される。この様に、拡散板８が乳白材であることと、拡散板８に設けたシボとによって発光ダイオード９からの照明光は拡散されて表示板７全体を照射するようになる。よって、第１の反射部２３を設けてあることによって影となり易い指針キャップ１７周囲も明るく透過照明させることが可能である。
【００２５】
また、拡散板８と表示板７との間に空間を設けたことにより、表示板７と拡散板８とが密接している状態に比べて、拡散板８から出射された光はより離れた表示板７裏面箇所まで届くようになる（広範囲にわたって照射可能となる）。従って、表示板７のほぼ全面を均一に透過照明させるにはより効果的である。なお、表示板７の地部２０は全面を透過させる必要はなく、任意の領域を不透過としても良い。
【００２６】
また、拡散板８の中心側を第１の反射部２３に、周縁側を第２の反射部２４に保持させることにより、拡散板８をばたつかせることなく、また別部材を使うこともなくケース部材１０に装着することができる。なお、拡散板８の大きさ（形状）は任意である。つまり、表示板７全体の照明を考慮した上で拡散板８の大小（形状）を決めればよく、大きさが小さい場合には周縁側を第２の反射部２４に保持させる必要はない。また、拡散板８を第１の反射部２３や第２の反射部２４に保持する際の保持方法は任意である。
【００２７】
なお、本実施形態においては指針５がシルエットで視認されるように構成したが、指針５照明用の光源を配置して、指針５の指示部１６が光源の光で発光するように構成しても良い。また、発光ダイオード９が点灯した際、表示板７の地部２０が白色で透過照明して表示部６がシルエットで視認されるように形成したが、地部が不透過で表示部が透過するように形成しても良い。その場合、指針キャップ１７の周辺に表示部が設けてあっても、表示板７のほぼ全面が明るく均一に透過可能に構成してあるため、良好な表示部照明が可能である。
【００２８】
また、本実施形態において拡散板８を透過性の乳白材として、拡散作用が増すようにしたが透明材としても良い。また、拡散板８の裏面側に白色の透過層を印刷したが必ずしも設ける必要はない。また、拡散板８の裏面に、拡散板８内に入射される光量を調整するために網点などによる調光用印刷を施すことによって、より均一な透過照明が得られるようにしても良い。
【００２９】
【発明の効果】
以上詳述したように、本発明によれば、表示板のほぼ全面を均一に透過照明可能な計器装置を提供することができる。
【図面の簡単な説明】
【図１】本発明の実施形態を示す計器装置の断面図。
【図２】同実施形態の表示板を示す部分断面図。
【図３】同実施形態の拡散板を示す正面図。
【図４】同実施形態の拡散板がケース部材に保持された状態を示す部分断面図。
【符号の説明】
１　回路基板
２　回動軸
３　計器本体
５　指針
６　表示部
７　表示板
８　拡散板
９　発光ダイオード（光源）
１０　ケース部材
２３　第１の反射部
２４　第２の反射部
２５　第１の反射面
２６　第２の反射面[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an instrument device mounted on a vehicle, for example, and more particularly to an instrument device provided with a diffusion plate behind a display panel.
[0002]
[Prior art]
In this type of instrument device, an instrument body 3 having a drive shaft 2 extending forward through a circuit board 1 is conductively fixed to the back side of the circuit board 1, and a pointer 4 is attached to a tip end of the drive shaft 2. A front panel 5 (display panel) is arranged between the hands 4 and the circuit board 1, and light sources 6 and 62 are arranged on the circuit board 1 around the drive shaft 2, and between the front panel 5 and the circuit board 1 And a reflector 7 having a first reflecting section 75 and a second reflecting section 77 (see, for example, Patent Document 1). Note that the above-mentioned reference numerals are used in Patent Document 1.
[0003]
In such a configuration, when the light sources 6 and 62 emit light, a part of the illuminating light is reflected by the first reflector 75 of the reflector 7 and guided to the second reflector 77 side, and the second reflection is performed. The illuminating light reaching the portion 77 is reflected by the second reflecting portion 77 and further guided to the front panel 5 side, so that the display portion 52 provided on the front panel 5 is brightly and uniformly transmitted and illuminated. .
[0004]
[Patent Document 1]
JP 2001-99685 A (FIGS. 4 and 7)
[0005]
[Problems to be solved by the invention]
However, in the above-mentioned conventional example, when the display unit capable of transmitting illumination is also provided at the front panel 5 (display plate) around the cover 42 constituting the hands 4, or when the light sources 6 and 62 are turned on, the display unit 52 is turned on. When the front panel 5 is formed such that the display unit 52 is visually recognized as a silhouette while the ground color unit 51 is removed, the light sources 6 and 62 are turned on to display the display unit around the cover 42 or the periphery of the cover 42. In this case, the shadow of the first reflection portion 75 occurs at the ground color portion 51, and the bright and uniform transmitted illumination does not occur.
[0006]
The present invention has been made in view of such a point, and an object of the present invention is to provide an instrument device capable of uniformly transmitting and illuminating substantially the entire surface of a display panel.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a circuit board, an instrument body mounted on the back side of the circuit board and having a rotating shaft extending through the circuit board and extending forward, and a tip side of the rotating shaft. A pointer to be fixed, a display plate disposed behind the pointer and having a display unit corresponding to the operation of the pointer, a diffusion plate disposed behind the display plate, and the circuit board around the rotation axis And a case member disposed between the display panel and the circuit board, wherein the case member surrounds the rotation axis between the diffusion plate and the light source. The light emitting device further includes a first reflecting portion disposed to face the light source, and a second reflecting portion disposed between the diffusion plate and the circuit board so as to surround the light source.
[0008]
Further, the diffusing plate is arranged with a space provided between the diffusing plate and the display plate.
[0009]
Further, the diffusion plate has a center side held by the first reflection portion and a peripheral side held by the second reflection portion.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with a vehicle instrument device as an embodiment. FIG. 1 shows a cross section of the instrument device, and FIG. 2 shows a partial cross section of the display panel. FIG. 3 is a front view of a diffusion plate provided in the instrument device, and FIG. 4 is a detailed partial cross-sectional view showing a state where the diffusion plate is held by a case member.
[0011]
An instrument device has a circuit board 1 and a rotating shaft 2 which is mounted on the back side of the circuit board 1 in a conductive state with the circuit board 1 and extends forward through the circuit board 1. 3, a pointer 5 having a pointer shaft 4 fixed to the distal end side of the rotating shaft 2, a display plate 7 provided behind the pointer 5 and provided with a display unit 6 corresponding to the operation of the pointer 5, A diffusing plate 8 disposed behind the display panel 7, a light emitting diode 9 as a light source disposed on the circuit board 1 around the rotation axis 2, and disposed between the display panel 7 and the circuit board 1. And a case member 10.
[0012]
Further, a cover 11 that covers the back side of the circuit board 1, a cover member 13 that is disposed on the front side of the display panel 7 and has an opening 12 that defines a visible area of the display panel 7, and a front side of the hands 5 and the display panel 7. A colorless and transparent see-through plate 14 covering the side is provided. Reference numeral 15 denotes a hollow cylindrical portion extending from a main body frame (not shown), which is a part of the instrument main body 3, through which the rotating shaft 2 is inserted and which is turned on the distal end side of the cylindrical portion 15. The driving shaft 2 is supported.
[0013]
The pointer 5 includes an indicator 16 made of, for example, a red synthetic resin integrally formed with the pointer shaft 4, and a pointer cap 17 made of black synthetic resin that covers the base of the indicator 16 (above the pointer shaft 4). Have. The pointer 5 is fixed to the main body 3 by press-fitting the pointer shaft 4 into the distal end of the rotating shaft 2 of the main body 3.
[0014]
The display plate 7 is provided with a display unit 6 which is a target to be indicated by the indicating unit 16 of the pointer 5, for example, a scale or a number indicating the engine speed of the vehicle. As shown in FIG. 2, the display plate 7 forms a ground portion 20 by printing, for example, a white transparent coloring layer 19 on the surface of a colorless and transparent substrate 18, and forms, for example, a black display on the surface of the ground portion 20. The display 21 is formed by printing the layer 21. In addition, a colorless and transparent protective layer 22 for protecting the transmissive colored layer 19 and the display layer 21 and suppressing reflection by external light is provided on the front side.
[0015]
The circuit board 1 is made of a rigid board, and the instrument body 3 is mounted on the back side in a conductive state. The electronic component (not shown) for driving the instrument body 3 and the like are provided together with a display plate 7 around the rotating shaft 2. A light emitting diode 9 that emits, for example, white light for transmitting illumination of is mounted.
[0016]
The case member 10 is made of a light-shielding white synthetic resin, and is disposed between the diffusion plate 8 and the light emitting diode 9 so as to surround the rotating shaft 2 (the cylindrical portion 15) and face the light emitting diode 9. 1 and a second reflector 24 arranged so as to surround the light emitting diode 9 between the diffusion plate 8 and the circuit board 1. The first reflecting portion 23 is provided with a first reflecting surface 25, and the first reflecting surface 25 reflects (guides) the light received from the light emitting diode 9 to the second reflecting portion 24 side. , Are inclined at approximately 45 degrees with respect to one surface of the circuit board.
[0017]
The second reflection portion 24 is provided with a second reflection surface 26 so as to reflect the light reflected on the first reflection surface 25 to the diffusion plate 8 side. The second reflection surface 26 is a plane parallel to the circuit board 1 near the light emitting diode 9, but is inclined so as to approach from the circuit board 1 side to the peripheral side of the diffusion plate 8 as the distance from the light emitting diode 9 increases. It is a curved surface (inclined curved surface). This inclined surface is not limited to a curved surface but may be a flat surface. Alternatively, a combination of a flat surface and a curved surface may be used. In addition, the first reflection part 23 and the second reflection part 24 are connected at a location (not shown) to be integrated.
[0018]
Further, the case member 10 in the present embodiment is provided integrally with a circular cylindrical portion 27 so as to surround the pointer shaft 4 or the rotating shaft 2 in front of the first reflecting portion 23 (display panel 7). is there. A first mounting surface 28 that supports the periphery of the through-hole of the display plate 7 is provided on the distal end side of the cylindrical portion 27. Further, the cylindrical portion 27 is connected to the first reflecting portion 23, and the second mounting surface 29 is provided on the first reflecting portion 23 which is larger in diameter than the cylindrical portion 27. Further, the case member 10 has a front surface 30, and the display panel 7 is mounted on and held by the first mounting surface 28 and the front surface 30. As described above, the case member 10 is a reflecting member that reflects the light of the light emitting diode 9 and also serves as a holding member that holds the display panel 7.
[0019]
As shown in FIG. 3, the diffuser plate 8 made of a translucent milky material has a substantially donut shape having a round hole 31 in the center portion substantially corresponding to the outer diameter of the cylindrical portion 27 of the case member 10. In addition, one slot 32 is provided in the peripheral portion of the round hole 31. A projection (not shown) provided around the cylindrical portion 27 is inserted into the groove 32 to prevent the diffusion plate 8 from rotating (positioning in the rotation direction).
[0020]
The surface of the diffusion plate 8 on the side of the display plate 7 is provided with a texture (fine irregularities). This grain may be on the back side of the display panel 7, or in place of the grain, for example, a transparent or translucent layer mixed with fine particles may be printed or applied. Is only required to be performed so as to be diffused and emitted. Although not shown, a white transmission layer is printed on the back side. In addition, three tongue pieces 33 are protruded from the periphery.
[0021]
FIG. 4 shows a state where the diffusion plate 8 is held by the case member 10. The peripheral edge of the circular hole 31 of the diffusion plate 8 is mounted on the second mounting surface 29, and in the present embodiment, is fixed to the second mounting surface 29 with a double-sided adhesive tape (not shown). The tongue piece 33 projecting from the peripheral edge of the diffusion plate 8 is inserted into a support hole 34 provided in the second reflection part 24, and the surface side of the tongue piece 33 is in contact with a cut surface 35 of the support hole 34. In this manner, the diffusion plate 8 is held in a state where the center side is held by the second mounting surface 29 provided in the first reflection portion 23 and the peripheral side is held in the support holes 34 provided in the second reflection portion 24. It is mounted on the case member 10.
[0022]
In the instrument device configured as described above, by illuminating the light emitting diode 9 at night or at twilight, the illumination light is reflected by the first reflection surface 25 and goes to the second reflection portion 24 side, and the second The light is reflected by the reflection surface 26 and travels to the diffusion plate 8 side. The light illuminating the back surface of the diffusion plate 8 is divided into light reflected by a white print layer provided on the back surface side and light transmitted through the diffusion plate 8, and the transmitted light illuminates the back surface of the display plate 7. . When the light passes through the diffusion plate 8, the light is diffused and directed toward the display plate 7 due to the provision of the grain on the surface in addition to the diffusion plate 8 being a translucent opalescent material.
[0023]
On the other hand, the light reflected on the white print layer is reflected on the second reflection surface 26 and goes to the diffusion plate 8 side, and repeats the reflection or transmits through the diffusion plate 8. Note that not all light is transmitted to the display plate 7 after passing through the diffusion plate 8, but light reflected on the second reflection surface 26 passes through the gap between the diffusion plate 8 and the second reflection portion 24 and is displayed. Some light goes to the plate 7 side.
[0024]
As described above, the light directed toward the display panel 7 irradiates the entire back surface of the display panel 7 substantially uniformly. Therefore, the ground portion 20 of the display panel 7 is almost uniformly transmitted and illuminated in white, and the display unit 6 is displayed in black (as a silhouette). The pointer 5 also receives a bright light from behind and is visually recognized as a silhouette. Thus, the illumination light from the light emitting diode 9 is diffused by the fact that the diffusion plate 8 is a milky material and the grain provided on the diffusion plate 8 illuminates the entire display plate 7. Therefore, the provision of the first reflecting portion 23 makes it possible to brightly transmit and illuminate the periphery of the pointer cap 17, which tends to be a shadow.
[0025]
Further, by providing a space between the diffusion plate 8 and the display plate 7, the light emitted from the diffusion plate 8 is farther apart than in a state where the display plate 7 and the diffusion plate 8 are in close contact. The light reaches the rear surface of the display panel 7 (irradiation can be performed over a wide range). Therefore, it is more effective to uniformly transmit and illuminate almost the entire surface of the display panel 7. The ground portion 20 of the display panel 7 does not need to transmit the entire surface, and an arbitrary region may be opaque.
[0026]
In addition, by holding the center side of the diffusion plate 8 on the first reflection portion 23 and the peripheral side on the second reflection portion 24, the diffusion plate 8 does not flutter and no separate member is used. It can be attached to the case member 10. The size (shape) of the diffusion plate 8 is arbitrary. In other words, the size (shape) of the diffusion plate 8 may be determined in consideration of the illumination of the entire display plate 7. When the size is small, the peripheral side does not need to be held by the second reflector 24. In addition, the holding method when holding the diffusion plate 8 on the first reflecting portion 23 or the second reflecting portion 24 is arbitrary.
[0027]
In the present embodiment, the pointer 5 is configured to be visually recognized in a silhouette. However, a light source for illuminating the pointer 5 is arranged so that the indicator 16 of the pointer 5 emits light from the light source. Is also good. Further, when the light emitting diode 9 is turned on, the ground portion 20 of the display panel 7 is formed so as to be transmitted and illuminated in white so that the display portion 6 is visually recognized in a silhouette, but the ground portion is opaque and the display portion is transmitted. It may be formed as follows. In this case, even if a display portion is provided around the pointer cap 17, almost the entire surface of the display plate 7 is configured to be bright and uniformly transmissive, so that good display portion illumination is possible.
[0028]
In the present embodiment, the diffusion plate 8 is made of a translucent opalescent material to increase the diffusion effect, but may be made of a transparent material. Further, a white transmission layer is printed on the back surface side of the diffusion plate 8, but it is not always necessary to provide it. Further, a more uniform transmitted illumination may be obtained by performing dimming printing using halftone dots or the like on the back surface of the diffusion plate 8 in order to adjust the amount of light incident into the diffusion plate 8.
[0029]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to provide an instrument device capable of uniformly transmitting and illuminating substantially the entire surface of a display panel.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a meter device showing an embodiment of the present invention.
FIG. 2 is a partial cross-sectional view showing the display panel of the embodiment.
FIG. 3 is an exemplary front view showing the diffusion plate of the embodiment;
FIG. 4 is a partial cross-sectional view showing a state where the diffusion plate of the embodiment is held by a case member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Circuit board 2 Rotating axis 3 Instrument main body 5 Indicator 6 Indicator 6 Display part 7 Display board 8 Diffusion board 9 Light emitting diode (light source)
10 case member 23 first reflecting portion 24 second reflecting portion 25 first reflecting surface 26 second reflecting surface

Claims

A circuit board, an instrument body mounted on the back side of the circuit board and having a pivot axis extending forward through the circuit board, a pointer fixed to the tip side of the pivot axis, A display plate having a display unit corresponding to the operation of the pointer, a diffusion plate disposed behind the display plate, a light source disposed on the circuit board around the rotation axis, and the display plate And a case member disposed between the light source and the circuit board, wherein the case member is disposed opposite to the light source so as to surround the rotation axis between the diffusion plate and the light source. And a second reflector disposed between the diffuser plate and the circuit board so as to surround the light source.

The instrument device according to claim 1, wherein a space is provided between the diffusion plate and the display plate.

3. The instrument device according to claim 1, wherein a center side of the diffusion plate is held by the first reflection portion, and a peripheral edge side of the diffusion plate is held by the second reflection portion. 4.