JP5229470B2

JP5229470B2 - Lighting device

Info

Publication number: JP5229470B2
Application number: JP2008279056A
Authority: JP
Inventors: 智志佐野
Original assignee: Nippon Seiki Co Ltd
Current assignee: Nippon Seiki Co Ltd
Priority date: 2008-10-30
Filing date: 2008-10-30
Publication date: 2013-07-03
Anticipated expiration: 2028-10-30
Also published as: JP2010107329A

Description

本発明は、例えば車両用の計器に用いられ、光源からの照射光で表示板を透過照明する照明装置に関するものである。 The present invention relates to an illuminating device that is used, for example, in an instrument for a vehicle and illuminates a display panel with light emitted from a light source.

指標部が設けられた表示板の表面側に所謂グラデーションを形成して、立体感を持たせて見栄えを良好とするようにしたものとして、例えば下記特許文献１がある。特許文献１に記載されている計器は、透過照明可能な指標部４が施された表示板５と、この表示板５の背後に配置された光源８とを備えている。そして、指標部４の周囲には透過印刷層２０領域が設けられ、この透過印刷層２０の前面側に、透過する光量が漸次変化するようにグラデーションによる黒色の遮光印刷層からなる透過光量調整層２１が設けてある。また、指標部４の輪郭部分には透過光量調整層２１と同じ黒色の遮光印刷層からなる縁取り部２１Ａが設けてある。 For example, Patent Document 1 below discloses a so-called gradation formed on the surface side of a display board provided with an index portion so as to give a three-dimensional feeling and a good appearance. The instrument described in Patent Document 1 includes a display board 5 provided with an indicator portion 4 capable of transmitting illumination, and a light source 8 disposed behind the display board 5. A transparent print layer 20 region is provided around the indicator portion 4, and a transmitted light amount adjustment layer including a black light-shielded print layer by gradation so that the transmitted light amount gradually changes on the front side of the transparent print layer 20. 21 is provided. In addition, an edge portion 21 </ b> A made of the same black light-shielding print layer as the transmitted light amount adjustment layer 21 is provided in the contour portion of the index portion 4.

この様に構成することによって、光源８が点灯した際には指標部４は透過照明によって明るく照らし出されると共に、指標部４周囲の透過印刷層２０領域は明るさが漸次変化するようになっているため、表示板５全体が立体的に見え、見栄えが良好となるというものである。また、指標部４の輪郭部分に縁取り部２１Ａを設けることによって、指標部４の境目が明確となり、見やすい計器を提供できるというものである。
特開２００３−２５４７９０号公報 With this configuration, when the light source 8 is turned on, the indicator portion 4 is brightly illuminated by the transmitted illumination, and the brightness of the transmissive print layer 20 area around the indicator portion 4 gradually changes. Therefore, the display panel 5 as a whole looks three-dimensional and looks good. Further, by providing the edge portion 21A in the contour portion of the indicator portion 4, the boundary of the indicator portion 4 becomes clear and an easy-to-see instrument can be provided.
JP 2003-254790 A

しかしながら、前記特許文献１に記載された計器の指標部４は、縁取り部２１Ａが設けてあるため輪郭が明確となって読みやすいが、縁取り部２１Ａが指標部４の周囲で一定とならないため、グラデーション領域が明確ではなく、見栄えが劣ってしまうという問題がある。即ち、透過光量の少ない箇所では黒色の透過光量調整層２１の印刷範囲（面積）が広くて黒色の縁取り部２１Ａと繋がってしまう。 However, the indicator portion 4 of the instrument described in Patent Document 1 has a border portion 21A, so that the outline is clear and easy to read, but the border portion 21A is not constant around the indicator portion 4, There is a problem that the gradation area is not clear and looks poor. That is, at a portion where the transmitted light amount is small, the printing range (area) of the black transmitted light amount adjustment layer 21 is wide and connected to the black border portion 21A.

また、前記特許文献１には記載されていないが、不透過性の指標部の周囲に、透過する光量が漸次変化するようにグラデーションによる黒色の遮光印刷層からなる透過光量調整層を設ける場合、透過光量の少ない箇所では黒色の透過光量調整層の印刷範囲（面積）が広くて黒色の指標部と繋がってしまい、グラデーション領域が明確ではなく見栄えが劣ってしまうと共に、指標部の輪郭が明確ではなく読みにくいという問題がある。 In addition, although not described in Patent Document 1, when a transmitted light amount adjustment layer including a black light-shielding print layer by gradation is provided around the impermeable indicator portion so that the transmitted light amount gradually changes, In areas where the amount of transmitted light is small, the black transmitted light amount adjustment layer has a wide print range (area) and is connected to the black index part. There is a problem that it is difficult to read.

本発明はこの様な点に鑑みなされたもので、指標部の周りにグラデーションを形成する際に、グラデーション領域が明確に視認されるようにした照明装置を提供することを目的とする。 The present invention has been made in view of these points, and an object of the present invention is to provide an illuminating device in which a gradation area is clearly visually recognized when gradation is formed around an indicator portion.

本発明は前記目的を達成するため、透過性の基板に設けられた透過性の指標部を有する表示板と、この表示板を背後から照射する光源とを備えた照明装置に於いて、前記表示板は、前記指標部の周りに設けられた透過層と、この透過層の前面側に設けられ所定の点または線を基準として前記透過層を透過する前記光源からの光量が漸次変化するようにグラデーションによる不透過性の透過光量調整層と、前記指標部を縁取る不透過性の縁取り層と、この縁取り層と前記透過光量調整層との間に、前記縁取り層に沿って配設される線状の透過性の隙間部とを有するものである。
In order to achieve the above object, the present invention provides an illuminating apparatus comprising a display plate having a transmissive indicator portion provided on a transmissive substrate, and a light source that irradiates the display plate from behind. The plate has a transmissive layer provided around the indicator portion and a light amount from the light source that is provided on the front side of the transmissive layer and transmits through the transmissive layer with reference to a predetermined point or line. An opaque transmission light amount adjustment layer by gradation, an impermeable border layer that borders the indicator portion, and the border layer and the transmitted light amount adjustment layer are disposed along the border layer. And a linear permeable gap portion.

また、透過性の基板に設けられた不透過性の指標部を有する表示板と、この表示板を背後から照射する光源とを備えた照明装置に於いて、前記表示板は、前記指標部の周りに設けられた透過層と、この透過層の前面側に設けられ所定の点または線を基準として前記透過層を透過する前記光源からの光量が漸次変化するようにグラデーションによる不透過性の透過光量調整層と、前記指標部と前記透過光量調整層との間に、前記指標部に沿って配設される線状の透過性の隙間部とを有するものである。 Further, in an illuminating device including a display plate having an impermeable indicator portion provided on a transmissive substrate and a light source that irradiates the display plate from behind, the display plate includes the indicator portion. A transmissive layer provided around, and an opaque transmission by gradation so that the amount of light from the light source that is provided on the front side of the transmissive layer and transmits the transmissive layer with reference to a predetermined point or line gradually changes. A light amount adjusting layer, and a linear transmissive gap portion disposed along the indicator portion between the indicator portion and the transmitted light amount adjusting layer are provided.

指標部の周りにグラデーションを形成する際に、グラデーション領域が明確に視認されるようにした照明装置を得ることができる。 When the gradation is formed around the indicator portion, an illumination device can be obtained in which the gradation area is clearly visually recognized.

本発明の照明装置を適用した車両用の計器を実施形態として説明する。図１〜図５に本発明の実施形態を示す。図１は計器の部分断面図であり、図２は計器に用いられる表示板の部分正面図である。図３は表示板の要部を示す正面図であり、図４，５は表示板の要部を示す断面図（図３に於けるＡ−Ａ断面，Ｂ−Ｂ断面）である。 A vehicle instrument to which the illumination device of the present invention is applied will be described as an embodiment. 1 to 5 show an embodiment of the present invention. FIG. 1 is a partial cross-sectional view of an instrument, and FIG. 2 is a partial front view of a display board used in the instrument. FIG. 3 is a front view showing a main part of the display panel, and FIGS. 4 and 5 are cross-sectional views (AA cross section and BB cross section in FIG. 3) showing the main part of the display board.

計器は、例えば速度計１を有し、硬質な回路基板２と、この回路基板２の裏面側に回路基板２と導通状態で装着され、回路基板２を貫通して前方に延びる回動軸３を有する計器本体４と、回動軸３の先端側に固着された指示部５を有する指針６と、指示部５の後方に配置され指示部５の指示対象となる車両の速度を現す指標部７が設けられた表示板８と、この表示板８と回路基板２との間に配置され表示板８が保持されるケース部材９と、回路基板２上に実装され指標部７を照明する光源としての指標部照明用発光ダイオード１０と、指針６を照明する光源としての指針照明用発光ダイオード１１を備えている。 The instrument has, for example, a speedometer 1, a hard circuit board 2, and a rotating shaft 3 that is attached to the circuit board 2 in a conductive state on the back side of the circuit board 2 and extends forward through the circuit board 2. A measuring instrument main body 4, a pointer 6 having a pointing portion 5 fixed to the tip end side of the rotating shaft 3, and an indicator portion that is arranged behind the pointing portion 5 and indicates the speed of the vehicle that is the pointing target of the pointing portion 5 7, a case member 9 disposed between the display board 8 and the circuit board 2 and holding the display board 8, and a light source mounted on the circuit board 2 and illuminating the indicator section 7. The indicator illumination light emitting diode 10 as an indicator and the pointer illumination light emitting diode 11 as a light source for illuminating the pointer 6 are provided.

また、表示板８の可視領域を定める開口部１２を有する例えば黒色の合成樹脂からなる見返し部材１３と、指針６や表示板８などの前方側を被う無色透明な合成樹脂からなる透視板１４と、回路基板２の裏面側を覆う合成樹脂製のカバー１５などを備えている。 Further, a turn-back member 13 made of, for example, black synthetic resin having an opening 12 that defines the visible region of the display board 8, and a see-through board 14 made of colorless and transparent synthetic resin covering the front side of the pointer 6, the display board 8, and the like. And a cover 15 made of synthetic resin covering the back side of the circuit board 2.

指針６は、無色透明な合成樹脂からなる指示部５の他に、指針軸１６と、遮光性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６は指針軸１６を計器本体４の回動軸３の先端側に圧入することによって計器本体４に固着される。指示部５の裏面には例えば白色の箔（図示せず）がホットスタンプされており、昼間など周囲が明るい時は指示部５が白色で視認される。また、夜間など周囲が暗い時に例えば赤色で発光する指針照明用発光ダイオード１１が点灯した際は、指示部５に導かれた光が白色の箔に反射して指示部５が赤色で視認されるようになっている。 The pointer 6 includes a pointer shaft 16 and a pointer cap 17 made of a light-shielding synthetic resin, in addition to the indicating portion 5 made of a colorless and transparent synthetic resin. The pointer 6 is fixed to the meter body 4 by press-fitting the pointer shaft 16 to the distal end side of the rotating shaft 3 of the meter body 4. For example, a white foil (not shown) is hot stamped on the back surface of the instruction unit 5. When the surroundings are bright, such as daytime, the instruction unit 5 is visually recognized in white. Further, when the pointer illumination light emitting diode 11 that emits red light, for example, when the surroundings are dark, such as at night, is turned on, the light guided to the pointing unit 5 is reflected by the white foil and the pointing unit 5 is visually recognized in red. It is like that.

ケース部材９は、遮光性のある例えば白色の合成樹脂からなり、回動軸３の周囲に配置された指針照明用発光ダイオード１１を囲むように配置された筒部１８と、この筒部１８の周囲に一体的に設けられ、指標部照明用発光ダイオード１０からの光を周囲に反射させる第1の反射壁１９と、指標部照明用発光ダイオード１０を取り巻くように傾斜して形成された第２の反射壁２０と、表示板８が支持される前面部２１などを有している。 The case member 9 is made of, for example, a white synthetic resin having a light-shielding property, and includes a cylindrical portion 18 disposed so as to surround the pointer illumination light emitting diode 11 disposed around the rotation shaft 3, and the cylindrical portion 18. A first reflecting wall 19 that is integrally provided around the surface and reflects light from the indicator portion illumination light emitting diode 10 to the surroundings, and a second inclined wall that surrounds the indicator portion illumination light emitting diode 10. The reflection wall 20 and the front surface portion 21 on which the display panel 8 is supported.

表示板８は、指針６の指針軸１６が挿通される貫通穴２２を有する無色透明な基板２３に車両の速度を現す目盛指標部７Ａ，数字指標部７Ｂ，文字指標部７Ｃからなる指標部７が設けられたものであり、矩形の目盛指標部７Ａは更に透過性の太目盛指標部７ＡＡと不透過性の細目盛指標部７ＡＢとに分けられる。また、目盛指標部７Ａの周り（各目盛指標部７Ａの間）はグラデーション領域ＧＲとなり、ここにグラデーションが形成されている。このグラデーション領域ＧＲと指標部７を除いた領域は地部２４となるもので、不透過性である例えば黒色の地色層２５が印刷してある。なお、詳細は図示しないが、数字指標部７Ｂおよび文字指標部７Ｃは透過性であり、基板２３の表面側箇所に例えば白色の透過性表示層が印刷してある。 The display board 8 includes an indicator portion 7 including a scale indicator portion 7A, a numeric indicator portion 7B, and a character indicator portion 7C that indicate a vehicle speed on a colorless and transparent substrate 23 having a through hole 22 through which the pointer shaft 16 of the pointer 6 is inserted. The rectangular scale indicator portion 7A is further divided into a transparent thick scale indicator portion 7AA and an impermeable fine scale indicator portion 7AB. A gradation area GR is formed around the scale index portion 7A (between each scale index portion 7A), where gradation is formed. The area excluding the gradation area GR and the index portion 7 becomes the ground portion 24, and is printed with a black ground color layer 25 which is impermeable. Although not shown in detail, the numeric indicator portion 7B and the character indicator portion 7C are transmissive, and a white transmissive display layer is printed on the surface side portion of the substrate 23, for example.

目盛指標部７Ａは、指針６の指示部５先端側に対応するように円弧状に設けられている。この目盛指標部７Ａの詳細について、図３および図４に基づいて説明する。太目盛指標部７ＡＡに対応した基板２３の表面側に太目盛指標部７ＡＡとなる例えば白色の透過性表示層２６を印刷する。この透過性表示層２６は、数字指標部７Ｂおよび文字指標部７Ｃを形成する際の透過性表示層と同一工程で印刷すれば良い。また、細目盛指標部７ＡＢに対応した箇所には例えば黒色の不透過性表示層２７を印刷する。また、太目盛指標部７ＡＡを縁取る不透過性である黒色の縁取り層２８を印刷する。この不透過性表示層２７と縁取り層２８は同一工程で印刷すれば良い。 The scale indicator portion 7A is provided in an arc shape so as to correspond to the distal end side of the indication portion 5 of the pointer 6. Details of the scale index portion 7A will be described with reference to FIGS. For example, a white transmissive display layer 26 to be the thick scale index portion 7AA is printed on the surface side of the substrate 23 corresponding to the thick scale index portion 7AA. The transmissive display layer 26 may be printed in the same process as the transmissive display layer when forming the numeric indicator portion 7B and the character indicator portion 7C. Further, for example, a black impermeable display layer 27 is printed at a location corresponding to the fine scale index portion 7AB. Further, the black border layer 28 that is impermeable that borders the thick scale indicator portion 7AA is printed. The impermeable display layer 27 and the border layer 28 may be printed in the same process.

次に、グラデーションの詳細について説明する。グラデーション領域ＧＲに対応した基板２３の表面側に例えば灰色の透過層２９を印刷する。本実施形態に於いては、各太目盛指標部７ＡＡの間に灰色の透過層２９が印刷してある。従って、細目盛指標部７ＡＢとなる黒色の不透過性表示層２７は灰色の透過層２９の前面側に印刷されている。そして、透過層２９の前面側に貫通穴２２の中心を基準として、指標部照明用発光ダイオード１０が点灯した際に透過層２９を透過する光量が漸次減少（変化）するようにグラデーションによる不透過性の透過光量調整層３０が印刷してある。この透過光量調整層３０は例えば黒色であり、前述した地色層２５，不透過性表示層２７，縁取り層２８と同一工程で設ければ良い。 Next, details of gradation will be described. For example, a gray transparent layer 29 is printed on the surface side of the substrate 23 corresponding to the gradation region GR. In the present embodiment, a gray transmission layer 29 is printed between each thick scale indicator portion 7AA. Therefore, the black impermeable display layer 27 that becomes the fine scale index portion 7AB is printed on the front side of the gray transmissive layer 29. Then, on the front side of the transmissive layer 29, with the center of the through hole 22 as a reference, when the indicator light-emitting diode 10 is turned on, the amount of light transmitted through the transmissive layer 29 is gradually reduced (changed) so as to be opaque due to gradation. A transparent transmitted light amount adjusting layer 30 is printed. The transmitted light amount adjustment layer 30 is, for example, black, and may be provided in the same process as the ground color layer 25, the impermeable display layer 27, and the border layer 28 described above.

本実施形態に於ける透過光量調整層３０について説明する。透過光量調整層３０は透過層２９の前面側にドットを形成したものである。ドットは各グラデーション領域ＧＲ内の遮光率を徐々に高めるように内側（表示板８の貫通穴２２側）から外側（見返し部材１３の開口部１２側）にかけて、例えば丸い点を０．６mm間隔で形成し、その径を徐々に大きくしていったものである。即ち、黒色の遮光部分（透過光量調整層３０）が内側から外側にかけて徐々に増すようになっている。従って、ドットの径が小さい領域では隣り合う遮光部分（ドット）は離れているが、ドットの径が大きい領域では遮光部分（ドット）は繋がっている。 The transmitted light amount adjustment layer 30 in this embodiment will be described. The transmitted light amount adjusting layer 30 is formed by forming dots on the front side of the transmissive layer 29. In order to gradually increase the light shielding rate in each gradation area GR, the dots extend from the inner side (through hole 22 side of the display panel 8) to the outer side (opening portion 12 side of the turn-back member 13), for example, round dots at intervals of 0.6 mm. It was formed and its diameter gradually increased. That is, the black light shielding portion (transmitted light amount adjustment layer 30) is gradually increased from the inside to the outside. Accordingly, adjacent light-shielding portions (dots) are separated in a region where the dot diameter is small, but light-shielding portions (dots) are connected in a region where the dot diameter is large.

なお、透過光量調整層３０を設ける際に、太目盛指標部７ＡＡを縁取る縁取り層２８との間および細目盛指標部７ＡＢとの間に隙間部３１が形成されるようにしてある。従って、ドットの径が小さい領域では縁取り層２８および細目盛指標部７ＡＢと透過光量調整層３０との間に灰色の透過層２９が視認される隙間部３１が形成される。また、ドットの径が大きい領域でも縁取り層２８および細目盛指標部７ＡＢと透過光量調整層３０との間に灰色の透過層２９が視認される隙間部３１が形成されるが、この領域での隙間部３１は線状となる。但し、灰色の隙間部３１と透過光量調整層３０が印刷されない灰色箇所とが重なる場合もある。 When the transmitted light amount adjustment layer 30 is provided, a gap portion 31 is formed between the border layer 28 that borders the thick scale indicator portion 7AA and between the fine scale indicator portion 7AB. Therefore, in the region where the dot diameter is small, a gap portion 31 where the gray transmission layer 29 is visually recognized is formed between the border layer 28 and the fine scale indicator portion 7AB and the transmitted light amount adjustment layer 30. Further, even in the region where the dot diameter is large, a gap portion 31 where a gray transmission layer 29 is visually recognized is formed between the border layer 28 and the fine scale indicator portion 7AB and the transmitted light amount adjustment layer 30, but in this region, The gap 31 is linear. However, the gray gap 31 and the gray portion where the transmitted light amount adjustment layer 30 is not printed may overlap.

また、指標部７，地部２４，グラデーション領域ＧＲを被って無色透明な保護層３２が設けてある。この保護層３２は外光による表示板８面の反射を抑えたり、印刷面にキズなどが付きにくいように保護するものである。なお、図２に於いては、グラデーション，黒色の縁取り層２８，隙間部３１の記載を省略すると共に、細目盛指標部７ＡＢを除いた指標部７を黒色で、細目盛指標部７ＡＢおよび地部２４を無色で示す。また、図３に於いて、クロス線を施した領域が黒色の地色層２５が印刷された地部２４である。 Further, a colorless and transparent protective layer 32 is provided so as to cover the indicator portion 7, the ground portion 24, and the gradation region GR. This protective layer 32 prevents reflection of the surface of the display board 8 by external light and protects the printed surface from being scratched. In FIG. 2, the description of gradation, black border layer 28 and gap 31 is omitted, and the indicator portion 7 excluding the fine scale indicator portion 7AB is black, and the fine scale indicator portion 7AB and the ground portion. 24 is shown in colorless. In FIG. 3, the cross-lined area is the ground portion 24 on which the black ground color layer 25 is printed.

この様に構成された計器の表示板８は、白色の太目盛指標部７ＡＡ，数字指標部７Ｂ，文字指標部７Ｃと、黒色の細目盛指標部７ＡＢと、灰色から黒色に漸次変化するグラデーション領域ＧＲが視認される。その際、太目盛指標部７ＡＡは黒色の地部２４と黒色の縁取り層２８とによって囲まれているために太目盛指標部７ＡＡの輪郭が明確となり、見やすいものとなる。また、縁取り層２８或いは黒色の細目盛指標部７ＡＢとグラデーションを形成する黒色の透過光量調整層３０との間に隙間部３１を設けることで、グラデーション領域ＧＲが明確となり、見栄えの低下が抑えられると共に、細目盛指標部７ＡＢの輪郭が明確となって見やすいものとなる。 The display board 8 of the instrument configured in this way includes a white thick scale indicator portion 7AA, a numeric indicator portion 7B, a character indicator portion 7C, a black fine scale indicator portion 7AB, and a gradation region that gradually changes from gray to black. GR is visually recognized. At that time, since the thick scale indicator portion 7AA is surrounded by the black ground portion 24 and the black border layer 28, the outline of the thick scale indicator portion 7AA becomes clear and easy to see. In addition, by providing the gap portion 31 between the border layer 28 or the black fine scale indicator portion 7AB and the black transmitted light amount adjustment layer 30 that forms the gradation, the gradation region GR becomes clear and deterioration in appearance can be suppressed. At the same time, the outline of the fine scale indicator portion 7AB becomes clear and easy to see.

また、例えば赤色で発光する指標部照明用発光ダイオード１０が点灯すると、指標部照明用発光ダイオード１０からの光はケース部材９の第１の反射壁１９に反射して第２の反射壁２０側に向かい、第２の反射壁２０で反射して表示板８の裏面を照射する。或いは表示板８の裏面を直射する光もある。この照射光によって太目盛指標部７ＡＡ，数字指標部７Ｂ，文字指標部７Ｃが赤色で透過照明されるようになる。 Also, for example, when the indicator light emitting diode 10 that emits red light is turned on, the light from the indicator light emitting diode 10 is reflected by the first reflecting wall 19 of the case member 9 and is on the second reflecting wall 20 side. The back surface of the display panel 8 is irradiated by being reflected by the second reflecting wall 20. Alternatively, there is also light that shines directly on the back surface of the display board 8. By this irradiation light, the thick scale indicator portion 7AA, the numeric indicator portion 7B, and the character indicator portion 7C are transmitted and illuminated in red.

また、グラデーション領域ＧＲは灰色の透過層２９を透過した暗みがかった赤色で視認される。この際、透過層２９上に黒色の透過光量調整層３０が印刷によって設けてあるために、グラデーション領域ＧＲ内が内側から外側にかけて暗みがかった赤色から黒色に漸次変化するグラデーションとして視認される。また、黒色の細目盛指標部７ＡＢは、細目盛指標部７ＡＢの長手方向に沿った両側が暗みがかった赤色で透過されることで、シルエットとして視認される。 Further, the gradation area GR is visually recognized in dark red that has passed through the gray transmission layer 29. At this time, since the black transmitted light amount adjusting layer 30 is provided on the transmissive layer 29 by printing, the gradation area GR is visually recognized as a gradation that gradually changes from dark red to black from the inside to the outside. Further, the black fine scale indicator portion 7AB is visually recognized as a silhouette by transmitting both sides along the longitudinal direction of the fine scale indicator portion 7AB in dark red.

この様に、指標部照明用発光ダイオード１０が点灯した際であっても、太目盛指標部７ＡＡは黒色の地部２４と黒色の縁取り層２８とによって囲まれているために赤色で透過照明される太目盛指標部７ＡＡの輪郭が明確となり、見やすいものとなる。また、縁取り層２８或いは黒色の細目盛指標部７ＡＢとグラデーションを形成する黒色の透過光量調整層３０との間に暗みがかった赤色で透過照明される隙間部３１を設けることで、グラデーション領域ＧＲが明確となり、見栄えの低下が抑えられると共に、細目盛指標部７ＡＢの輪郭が明確となって見やすいものとなる。 In this manner, even when the indicator light-emitting diode 10 is turned on, the thick scale indicator portion 7AA is transmitted and illuminated in red because it is surrounded by the black ground portion 24 and the black border layer 28. The outline of the thick scale index portion 7AA becomes clear and easy to see. Further, the gradation region GR is provided by providing a gap portion 31 that is transmitted and illuminated in dark red between the border layer 28 or the black fine scale indicator portion 7AB and the black transmitted light amount adjustment layer 30 that forms the gradation. Becomes clear, the deterioration of the appearance is suppressed, and the outline of the fine scale indicator portion 7AB becomes clear and easy to see.

なお、本実施形態に於いては、グラデーションを目盛指標部７Ａの長手方向に沿った両側のみに形成するようにしたが、目盛指標部７Ａの全周を全て囲むように形成しても良い。また、目盛指標部７Ａの周りにグラデーションを形成したが、数字指標部７Ｂ或いは文字指標部７Ｃの周りであっても良い。 In the present embodiment, gradation is formed only on both sides along the longitudinal direction of the scale indicator portion 7A, but it may be formed so as to surround the entire circumference of the scale indicator portion 7A. Further, although gradation is formed around the scale indicator portion 7A, it may be around the numeral indicator portion 7B or the character indicator portion 7C.

また、透過光量調整層３０を丸い点とし、グラデーション領域ＧＲ内に於いて、表示板８の貫通穴２２側（内側）から見返し部材１３の開口部１２側（外側）にかけて径を徐々に大きくしたものとしたが、外側から内側にかけて径を徐々に大きくしたものでも良く、形状も丸に限定するものではない。要は、所定の点または線を基準として透過層２９を透過する指標部照明用発光ダイオード１０からの光量が漸次変化するようになっていれば良い。 Further, the transmitted light amount adjustment layer 30 is rounded, and the diameter is gradually increased from the through hole 22 side (inner side) of the display plate 8 to the opening 12 side (outer side) of the turning member 13 in the gradation region GR. However, the diameter may be gradually increased from the outside to the inside, and the shape is not limited to a circle. In short, it is only necessary that the amount of light from the indicator portion illumination light-emitting diode 10 that passes through the transmission layer 29 is gradually changed with a predetermined point or line as a reference.

本発明の照明装置を適用した計器の部分断面図。The fragmentary sectional view of the instrument to which the illuminating device of this invention is applied. 同計器に用いられる表示板の部分正面図。The partial front view of the display board used for the instrument. 同表示板の要部を示す正面図。The front view which shows the principal part of the display board. 同表示板の要部を示す断面図（図３に於けるＡ−Ａ断面）。Sectional drawing which shows the principal part of the display board (AA cross section in FIG. 3). 同表示板の要部を示す断面図（図３に於けるＢ−Ｂ断面）。Sectional drawing which shows the principal part of the display board (BB cross section in FIG. 3).

Explanation of symbols

７指標部
７Ａ目盛指標部
７ＡＡ太目盛指標部
７ＡＢ細目盛指標部
８表示板
１０指標部照明用発光ダイオード（光源）
２３基板
ＧＲグラデーション領域
２８縁取り層
２９透過層
３０透過光量調整層
３１隙間部 7 indicator portion 7A scale indicator portion 7AA thick scale indicator portion 7AB fine scale indicator portion 8 display board 10 indicator portion illumination light emitting diode (light source)
23 Substrate GR Gradation region 28 Border layer 29 Transmission layer 30 Transmitted light amount adjustment layer 31 Gap

Claims

In an illuminating device including a display plate having a transparent indicator portion provided on a transparent substrate and a light source for irradiating the display plate from behind, the display plate is provided around the indicator portion. And a non-transparent transmitted light amount adjusting layer by gradation so that the light amount from the light source that is transmitted through the transmissive layer is gradually changed with reference to a predetermined point or line provided on the front side of the transmissive layer. And an impermeable border layer that borders the indicator portion, and a linear transparent gap portion disposed along the border layer between the border layer and the transmitted light amount adjustment layer. A lighting device comprising:

In a lighting device including a display panel having an impermeable indicator portion provided on a transparent substrate and a light source that irradiates the display plate from behind, the display plate is provided around the indicator portion. Impervious transmitted light amount adjustment by gradation so that the light amount from the light source that is provided on the front side of the transmissive layer and transmits the transmissive layer with reference to a predetermined point or line is gradually changed An illumination device comprising: a layer; and a linear transmissive gap portion disposed along the indicator portion between the indicator portion and the transmitted light amount adjustment layer.