JP5249806B2 - Touch switch - Google Patents

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JP5249806B2
JP5249806B2 JP2009032400A JP2009032400A JP5249806B2 JP 5249806 B2 JP5249806 B2 JP 5249806B2 JP 2009032400 A JP2009032400 A JP 2009032400A JP 2009032400 A JP2009032400 A JP 2009032400A JP 5249806 B2 JP5249806 B2 JP 5249806B2
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lead
out wiring
touch electrode
width
metal
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JP2010191504A (en
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勝正 鴻野
淳 岡田
君奉 連山
英詔 水元
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Gunze Ltd
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Description

本発明は、指やペンなどでタッチされた位置を検出するタッチスイッチに関するものである。   The present invention relates to a touch switch that detects a position touched with a finger or a pen.

従来より種々のタッチスイッチが開発・開示されている。タッチスイッチはディスプレイの前面に配置されるため、透明にされる。そのため、タッチスイッチに使用される電極はＩＴＯなどの透明電極が使用される。   Various touch switches have been developed and disclosed. Since the touch switch is arranged on the front surface of the display, it is made transparent. Therefore, a transparent electrode such as ITO is used as an electrode used for the touch switch.

しかし、金属に比べてＩＴＯの抵抗率は高い。タッチスイッチのサイズが大型化すると、抵抗値の増加に伴い静電容量検出の感度が低下し、タッチスイッチとして動作させるのが困難になる。また、ＩＴＯに含まれるインジウムは希少金属であるため、ＩＴＯの使用を避けることが好ましい。   However, the resistivity of ITO is higher than that of metal. As the size of the touch switch increases, the sensitivity of capacitance detection decreases as the resistance value increases, making it difficult to operate as a touch switch. Further, since indium contained in ITO is a rare metal, it is preferable to avoid the use of ITO.

そこで、金属線で電極を形成したタッチスイッチが下記特許文献１〜３に開示されている。金属線が極細線であるため、タッチスイッチの光透過率を落としにくい。金属線はＩＴＯよりも抵抗が低く、タッチスイッチの大型化が可能である。   Thus, touch switches in which electrodes are formed with metal wires are disclosed in Patent Documents 1 to 3 below. Since the metal wire is a very thin wire, it is difficult to reduce the light transmittance of the touch switch. The metal wire has a lower resistance than ITO, and the touch switch can be enlarged.

透明基板の上に複数のタッチ電極部を縦横に並べたタッチスイッチがある（特許文献４など）。タッチ電極部から引き出し配線部が透明基板の端部に延びている。特許文献４の図７に示されるタッチスイッチはＩＴＯが使用されているが、特許文献１〜３の金属線を適用することが可能である。この場合、図９、図１０のように、透明基板５２の上にタッチ電極部５４と引き出し配線部５６が形成されたタッチスイッチ５０となる。タッチ電極部５４と引き出し配線部５６は金属線５８を網目状にしたものである。タッチ電極部５４同士の間、引き出し配線部５６同士の間、タッチ電極部５４と引き出し配線部５６との間は、金属線５８を形成せず、絶縁部６０となる。   There is a touch switch in which a plurality of touch electrode portions are arranged vertically and horizontally on a transparent substrate (for example, Patent Document 4). A lead-out wiring portion extends from the touch electrode portion to an end portion of the transparent substrate. Although the touch switch shown in FIG. 7 of Patent Document 4 uses ITO, the metal wires of Patent Documents 1 to 3 can be applied. In this case, as shown in FIGS. 9 and 10, the touch switch 50 has the touch electrode portion 54 and the lead-out wiring portion 56 formed on the transparent substrate 52. The touch electrode portion 54 and the lead-out wiring portion 56 are obtained by forming a metal wire 58 in a mesh shape. A metal wire 58 is not formed between the touch electrode portions 54, between the lead-out wiring portions 56, and between the touch electrode portion 54 and the lead-out wiring portion 56, and becomes an insulating portion 60.

しかし、タッチスイッチ５０の中央部から端部にいくにしたがって、引き出し配線部５６が増加する。そのため、タッチスイッチ５０の端部にいくにしたがって、図１０（ａ）から図１０（ｂ）のように金属線５８のない絶縁部６０が増加し、金属線５８の密度が低くなる。タッチスイッチ５０の位置によってタッチスイッチ５０の光の透過率が異なる。このため、ディスプレイの前面にタッチスイッチ５０を配置し、特にディスプレイで均一な色彩の表示がおこなわれると、タッチ電極部５４や引き出し配線部５６が視認され、ディスプレイの表示品位が低下する。   However, as the touch switch 50 moves from the center portion to the end portion, the lead-out wiring portion 56 increases. Therefore, as it goes to the end of the touch switch 50, as shown in FIG. 10A to FIG. 10B, the insulating portion 60 without the metal wire 58 increases, and the density of the metal wire 58 decreases. The light transmittance of the touch switch 50 differs depending on the position of the touch switch 50. For this reason, when the touch switch 50 is disposed on the front surface of the display and uniform color display is performed on the display in particular, the touch electrode portion 54 and the lead-out wiring portion 56 are visually recognized, and the display quality of the display is deteriorated.

特開２００６−３４４１６３号公報JP 2006-344163 A 特開２００４−１９２０９３号公報JP 2004-192093 A 特開２００３−２５６１３６号公報JP 2003-256136 A 国際公開番号ＷＯ２００５／１１４３６９International Publication Number WO2005 / 114369

本発明の目的は、ディスプレイの表示品位低下を防止できるタッチスイッチを提供することにある。   The objective of this invention is providing the touch switch which can prevent the display quality fall of a display.

本発明のタッチスイッチは、基板と、前記基板の一面に金属線を網目状にして形成された複数のタッチ電極部と、前記基板の一面に金属線を網目状にして形成され、それぞれのタッチ電極部から基板の端部に引き出された引き出し配線部とを備える。タッチ電極部と引き出し配線部とで金属線の幅、金属線同士のピッチ、またはその両方が異なる。タッチ電極部と引き出し配線部とで金属線の幅、金属線同士のピッチ、またはその両方が異なることにより、タッチ電極部と引き出し配線部とで光の透過率が異なる。   The touch switch of the present invention includes a substrate, a plurality of touch electrode portions formed on one surface of the substrate with a metal wire mesh, and a metal wire formed on the surface of the substrate. And a lead-out wiring portion that is led out from the electrode portion to the end portion of the substrate. The touch electrode portion and the lead-out wiring portion have different metal line widths, pitches between metal lines, or both. The touch electrode portion and the lead-out wiring portion are different in the width of the metal line, the pitch between the metal lines, or both, so that the light transmittance is different between the touch electrode portion and the lead-out wiring portion.

前記タッチ電極部と引き出し配線部とで金属線の幅、金属線同士のピッチ、またはその両方が異なることによりタッチスイッチ全域の光透過率が均一である。タッチ電極部と引き出し配線部とで光の透過率が異なることを利用して、タッチスイッチ全域で光透過率を均一にする。なお、光透過率の均一は、厳密な均一ではなく、肉眼で見たときに光透過率の差が分からない程度を含む。   The light transmittance of the entire touch switch is uniform because the width of the metal lines, the pitch between the metal lines, or both are different between the touch electrode section and the lead-out wiring section. Utilizing the fact that the light transmittance is different between the touch electrode portion and the lead-out wiring portion, the light transmittance is made uniform throughout the touch switch. Note that the uniformity of the light transmittance is not strictly uniform, and includes such a degree that the difference in light transmittance is not known when viewed with the naked eye.

前記引き出し配線部同士の間に絶縁部が形成されており、絶縁部の幅と引き出し配線部の幅の比率に応じて、タッチ電極部と引き出し配線部とは、金属線の幅、金属線同士のピッチ、またはその両方が異なる。タッチスイッチ全域での光透過率を均一にするために、絶縁部の幅と引き出し配線部の幅の比率を利用する。   An insulating part is formed between the lead-out wiring parts, and the touch electrode part and the lead-out wiring part have a width of the metal line and a metal line according to the ratio of the width of the insulating part and the width of the lead-out wiring part. The pitch or both are different. In order to make the light transmittance uniform throughout the touch switch, the ratio of the width of the insulating portion to the width of the lead-out wiring portion is used.

前記金属線の幅は、引き出し配線部よりもタッチ電極部の方が細い。タッチ電極部の金属線の幅を細くすることにより、タッチ電極部の光透過率が高くなる。   The width of the metal line is narrower in the touch electrode part than in the lead-out wiring part. By reducing the width of the metal line of the touch electrode portion, the light transmittance of the touch electrode portion is increased.

前記金属線同士のピッチは、引き出し配線部よりもタッチ電極部の方が広い。タッチ電極部の金属線のピッチを広めることにより、タッチ電極部の光透過率が高くなる。   The pitch between the metal wires is wider in the touch electrode portion than in the lead-out wiring portion. Increasing the pitch of the metal lines of the touch electrode portion increases the light transmittance of the touch electrode portion.

前記引き出し配線部の金属線の幅は、基板の端部から基板の中央にいくにしたがって連続的にもしくは段階的に幅が細くなる。引き出し配線部の金属線の幅を連続的にもしくは段階的に細くすることにより、引き出し配線部の基板の端部側よりも基板中央部側の光透過率を高める。   The width of the metal line of the lead-out wiring portion becomes narrower continuously or stepwise as it goes from the end of the substrate to the center of the substrate. By reducing the width of the metal line of the lead-out wiring part continuously or stepwise, the light transmittance on the substrate central part side is higher than the end part side of the board of the lead-out wiring part.

前記絶縁部の幅は、基板の端部にいくにしたがって連続的にもしくは段階的に幅が狭くなる。基板の端部から中央に向かうにしたがって絶縁部の密度が減少するが、基板の中央部ほど絶縁部の幅を広げて、光透過率を均一にする。   The width of the insulating portion becomes narrower continuously or stepwise as it goes to the end of the substrate. The density of the insulating portion decreases from the end of the substrate toward the center, but the width of the insulating portion is increased toward the center of the substrate to make the light transmittance uniform.

本発明は、上記構成によりタッチスイッチ全域で光の透過率を均一化することができる。ディスプレイの前面にタッチスイッチを配置しても、表示品位を下げにくい。従来と比べて、特にディスプレイで均一な色彩を表示したときに、タッチスイッチのタッチ電極部や引き出し配線が視認されにくい。   According to the present invention, the light transmittance can be made uniform throughout the touch switch with the above-described configuration. Even if a touch switch is placed on the front of the display, it is difficult to lower the display quality. Compared with the prior art, especially when a uniform color is displayed on the display, the touch electrode portion of the touch switch and the lead-out wiring are less visible.

本発明のタッチスイッチのタッチ電極部および引き出し配線部の一例を示す図である。It is a figure which shows an example of the touch electrode part and extraction wiring part of the touch switch of this invention. タッチ電極部と引き出し配線部とで金属線幅を変更した構成を示す平面図であり、（ａ）はタッチ電極部と引き出し配線部の接続部付近を示し、（ｂ）は引き出し配線部が並べられた箇所を示す。It is a top view which shows the structure which changed the metal line | wire width with a touch electrode part and a lead-out wiring part, (a) shows the connection part vicinity of a touch electrode part and a lead-out wiring part, (b) is a lead-out wiring part side by side Shows the location. タッチ電極部と引き出し配線部とで金属線幅を変更した構成を示す断面図であり、（ａ）はタッチ電極部の断面図、（ｂ）は引き出し配線部の断面図である。It is sectional drawing which shows the structure which changed the metal line | wire width by the touch electrode part and the lead-out wiring part, (a) is sectional drawing of a touch electrode part, (b) is sectional drawing of a lead-out wiring part. タッチ電極部と引き出し配線部とで金属線同士のピッチを変更した構成を示す平面図であり、（ａ）はタッチ電極部と引き出し配線部の接続部付近を示し、（ｂ）は引き出し配線部が並べられた箇所を示す。It is a top view which shows the structure which changed the pitch of metal wires with a touch electrode part and a lead-out wiring part, (a) shows the connection part vicinity of a touch electrode part and a lead-out wiring part, (b) is a lead-out wiring part Indicates where the symbols are arranged. タッチ電極部と引き出し配線部とで金属線同士のピッチを変更した構成を示す断面図であり、（ａ）はタッチ電極部の断面図、（ｂ）は引き出し配線部の断面図である。It is sectional drawing which shows the structure which changed the pitch of metal wires with a touch electrode part and a lead-out wiring part, (a) is sectional drawing of a touch electrode part, (b) is sectional drawing of a lead-out wiring part. 中間部を設けたタッチスイッチの図であり、（ａ）はタッチ電極部が徐々に小さくなるタッチスイッチであり、（ｂ）はタッチ電極部が同じ大きさのタッチスイッチである。It is a figure of the touch switch which provided the intermediate part, (a) is a touch switch in which a touch electrode part becomes small gradually, (b) is a touch switch in which a touch electrode part is the same magnitude | size. 図６（ａ）の場合の一部を拡大した図である。It is the figure which expanded a part in the case of Fig.6 (a). 図６（ｂ）の場合の一部を拡大した図である。It is the figure which expanded a part in the case of FIG.6 (b). 従来のタッチスイッチのタッチ電極部および引き出し配線部の一例を示す図である。It is a figure which shows an example of the touch electrode part and extraction wiring part of the conventional touch switch. 従来のタッチ電極部と引き出し配線部の平面図であり、（ａ）はタッチ電極部と引き出し配線部の接続部付近を示し、（ｂ）は引き出し配線部が並べられた箇所を示す。It is a top view of the conventional touch electrode part and lead wiring part, (a) shows the connection part vicinity of a touch electrode part and lead wiring part, (b) shows the location where the lead wiring part was arranged.

本発明のタッチスイッチについて図面を使用して説明する。図面は模式的に示しており、実物とは異なる場合がある。説明するタッチスイッチは静電容量式のタッチスイッチである。   The touch switch of the present invention will be described with reference to the drawings. The drawings are shown schematically and may differ from the actual product. The touch switch to be described is a capacitive touch switch.

図１のタッチスイッチ１０は、絶縁性の透明基板１２、透明基板１２の一面に形成されたタッチ電極部１４、および透明基板１２の一面に形成された引き出し配線部１６を備える。   The touch switch 10 of FIG. 1 includes an insulating transparent substrate 12, a touch electrode portion 14 formed on one surface of the transparent substrate 12, and a lead wiring portion 16 formed on one surface of the transparent substrate 12.

透明基板１２は誘電体基板である。透明基板１２の材料は、ガラス、ポリエステル、ポリエチレンテレフタレート、ポリカーボネート、ポリメチルメタクリレート、ポリエチレンナフタレートなどの透明材料が挙げられる。ガラスであれば厚みは約０．１〜２ｍｍであり、プラスチックフィルムであれば厚みは約１０〜２０００μｍである。また、これらの材料を多層に積層してもよい。   The transparent substrate 12 is a dielectric substrate. Examples of the material of the transparent substrate 12 include transparent materials such as glass, polyester, polyethylene terephthalate, polycarbonate, polymethyl methacrylate, and polyethylene naphthalate. In the case of glass, the thickness is about 0.1 to 2 mm, and in the case of a plastic film, the thickness is about 10 to 2000 μm. Further, these materials may be laminated in multiple layers.

透明基板１２の一面にタッチ電極部１４と引き出し配線部１６が形成され、他面がディスプレイと接する。透明基板１２の一面側には、タッチ電極部１４と引き出し配線部１６を覆うように、透明接着剤を使用して透明のカバーフィルムが取り付けられる。カバーフィルム以外に透明の樹脂を積層して保護膜としても良い。ディスプレイに透明基板１２を取り付けるとき、他面とディスプレイの間に透明接着剤を使用する。   Touch electrode portion 14 and lead-out wiring portion 16 are formed on one surface of transparent substrate 12, and the other surface is in contact with the display. A transparent cover film is attached to one surface side of the transparent substrate 12 using a transparent adhesive so as to cover the touch electrode portion 14 and the lead wiring portion 16. In addition to the cover film, a transparent resin may be laminated to form a protective film. When attaching the transparent substrate 12 to the display, a transparent adhesive is used between the other surface and the display.

接着剤としては、アクリル系の接着剤、アクリルウレタン系の接着剤、ポリエステルアクリレート系の接着剤、エポキシアクリレート系の接着剤などの透明接着剤を挙げることができる。またタッチ電極部１４を、ディスプレイに接する面に設けることも可能である。   Examples of the adhesive include transparent adhesives such as acrylic adhesives, acrylic urethane adhesives, polyester acrylate adhesives, and epoxy acrylate adhesives. It is also possible to provide the touch electrode portion 14 on a surface in contact with the display.

タッチ電極部１４は、図２などに示すように、金属線１８を網目状にしたものである。網目状の具体例としては、金属線１８を格子状にした形状が挙げられる。金属線１８は極細線である。金属線１８同士は等間隔に並べられる。タッチ電極部１４は方形であり、その方形は網目状となった金属線１８で形成される。タッチ電極部１４は、透明基板１２の一面に縦横に並べられる。指などが近接またはタッチされた位置にあるタッチ電極部１４の静電容量が変化し、その変化を検出することによって、タッチスイッチとして動作する。静電容量を検出できるのであれば、タッチ電極部１４は方形に限定されない。   As shown in FIG. 2 and the like, the touch electrode portion 14 is formed by forming a metal wire 18 in a mesh shape. A specific example of the mesh shape is a shape in which the metal wires 18 are in a lattice shape. The metal wire 18 is a very thin wire. The metal wires 18 are arranged at equal intervals. The touch electrode portion 14 has a square shape, and the square shape is formed by a metal wire 18 having a mesh shape. The touch electrode portions 14 are arranged vertically and horizontally on one surface of the transparent substrate 12. The capacitance of the touch electrode unit 14 at a position where a finger or the like is in proximity or touched changes, and operates as a touch switch by detecting the change. As long as the capacitance can be detected, the touch electrode unit 14 is not limited to a square shape.

引き出し配線部１６は、タッチ電極部１４と同様に金属線１８を網目状にしたものである。金属線１８は極細線である。金属線１８同士は等間隔に並べられる。引き出し配線部１６は線状であり、その線状は、網目状となった金属線１８で形成される。引き出し配線部１６は、タッチ電極部１４から透明基板１２の端部に延びるようにして形成される。透明基板１２の端部でタッチ電極部１４の静電容量の変化を検出する検出回路に接続される。   Similar to the touch electrode portion 14, the lead wiring portion 16 is a metal wire 18 having a mesh shape. The metal wire 18 is a very thin wire. The metal wires 18 are arranged at equal intervals. The lead-out wiring portion 16 has a linear shape, and the linear shape is formed by a metal wire 18 having a mesh shape. The lead wiring part 16 is formed so as to extend from the touch electrode part 14 to the end part of the transparent substrate 12. The end of the transparent substrate 12 is connected to a detection circuit that detects a change in capacitance of the touch electrode unit 14.

なお、図１においては、引き出し配線部１６は透明基板１２の端部から延びているが、特許文献４の図７のように、対向する両端部から延びる場合もある。したがって、説明中、透明基板１２の端部から中央部に向かうことは、検出回路に接続される部分から離れることである。   In FIG. 1, the lead-out wiring portion 16 extends from the end portion of the transparent substrate 12. However, as shown in FIG. Therefore, in the description, going from the end portion of the transparent substrate 12 to the central portion is away from the portion connected to the detection circuit.

タッチ電極部１４および引き出し配線部１６は、全ての金属線１８が網目状になってつながっている。タッチ電極部１４および引き出し配線部１６はその領域全体として導電性を有する。   The touch electrode portion 14 and the lead-out wiring portion 16 are all connected with a metal line 18 in a mesh shape. The touch electrode portion 14 and the lead-out wiring portion 16 have conductivity as a whole area.

ディスプレイには縦横にブラックマトリクスが形成されている。金属線１８の方向は、ブラックマトリクスの方向に対して斜方向になるようにする。ブラックマトリクスと金属線１８が同方向に並ぶとモアレが発現するため、それを避けるためである。   A black matrix is formed vertically and horizontally on the display. The direction of the metal line 18 is inclined with respect to the direction of the black matrix. This is to avoid moiré when the black matrix and the metal wire 18 are arranged in the same direction.

金属線１８の形成方法は、（ｉ）極微細な導電性粒子を含む導電性ペーストを透明基板１２の上にスクリーン印刷する方法（特開２００７−１４２３３４等参照）、（ｉｉ）銅などの金属箔を透明基板１２の上に積層し、金属箔の上にレジストパターンを形成し、金属箔をエッチングする方法（特開２００８−３２８８４等参照）が挙げられる。   The metal wire 18 is formed by (i) a method in which a conductive paste containing ultrafine conductive particles is screen-printed on the transparent substrate 12 (see Japanese Patent Application Laid-Open No. 2007-142334, etc.), and (ii) a metal such as copper. A method of laminating a foil on the transparent substrate 12, forming a resist pattern on the metal foil, and etching the metal foil (see Japanese Patent Application Laid-Open No. 2008-32884 etc.) can be mentioned.

また、金属線１８の形成方法は、上記（ｉ）、（ｉｉ）の形成方法に限定されることはない。上記（ｉ）以外のグラビア印刷などの印刷法や上記（ｉｉ）以外のフォトリソグラフィを使用してもよい。   Moreover, the formation method of the metal wire 18 is not limited to the formation method of said (i) and (ii). Printing methods other than the above (i), such as gravure printing, and photolithography other than the above (ii) may be used.

タッチ電極部１４同士および引き出し配線部１６同士は絶縁する必要がある。また、タッチ電極部１４とそのタッチ電極部１４から延びていない引き出し配線部１６も絶縁する必要がある。したがって、それらの間には金属線１８を設けずに絶縁部２０にする（図２）。絶縁部２０は金属線１８がないため、タッチ電極部１４や引き出し配線部１６よりも光の透過率が高い。図２などの絶縁部２０は、いずれも一定幅になっている。   It is necessary to insulate the touch electrode portions 14 and the lead wiring portions 16 from each other. Further, it is necessary to insulate the touch electrode portion 14 and the lead wiring portion 16 that does not extend from the touch electrode portion 14. Therefore, the insulating portion 20 is formed without providing the metal wire 18 between them (FIG. 2). Since the insulating portion 20 does not have the metal wire 18, the light transmittance is higher than that of the touch electrode portion 14 and the lead-out wiring portion 16. Each of the insulating portions 20 shown in FIG. 2 has a constant width.

図１に示すように、一列に並んだ複数のタッチ電極部１４から同方向に引き出し配線部１６が設けられる。透明基板１２の端部にいくにしたがって、引き出し配線部１６および絶縁部２０が増加する。また、引き出し配線部１６を並べて配置するため、透明基板１２の端部では引き出し配線部１６と絶縁部２０が交互に配置される。そのため、透明基板１２の端部にいくにしたがって、タッチ電極部１４の面積が狭くなる。   As shown in FIG. 1, lead-out wiring portions 16 are provided in the same direction from a plurality of touch electrode portions 14 arranged in a line. As it goes to the end of the transparent substrate 12, the lead-out wiring part 16 and the insulating part 20 increase. Further, since the lead-out wiring portions 16 are arranged side by side, the lead-out wiring portions 16 and the insulating portions 20 are alternately arranged at the end of the transparent substrate 12. Therefore, the area of the touch electrode portion 14 becomes narrower as it goes to the end portion of the transparent substrate 12.

透明基板１２の各領域で、タッチ電極部１４、引き出し配線部１６、および絶縁部２０の割合が異なる。透明基板１２の端部にいくにしたがって引き出し配線部１６が増加し、そのため絶縁部２０も増加する。絶縁部２０が増加することによって、光の透過率が高くなるため、タッチスイッチ全域で光の透過率が均一になるようにする。その具体的構成について以下に説明する。   The ratios of the touch electrode portion 14, the lead-out wiring portion 16, and the insulating portion 20 are different in each region of the transparent substrate 12. As it goes to the end of the transparent substrate 12, the lead-out wiring portion 16 increases, and therefore the insulating portion 20 also increases. The increase in the insulating portion 20 increases the light transmittance, so that the light transmittance is uniform over the entire touch switch. The specific configuration will be described below.

図２、図３に示すように、タッチ電極部１４と引き出し配線部１６とで金属線１８の幅を異ならせる。具体的には、引き出し配線部１６の金属線１８の幅ｄ２よりもタッチ電極部１４の金属線の幅ｄ１を細くする。透明基板１２の端部にいくほど絶縁部２０が増加して光透過率が高くなるが、タッチ電極部１４の光透過率を高めることによって、タッチスイッチ全域の光透過率を均一になるようにする。   As shown in FIGS. 2 and 3, the widths of the metal wires 18 are made different between the touch electrode portion 14 and the lead-out wiring portion 16. Specifically, the width d1 of the metal line of the touch electrode portion 14 is made narrower than the width d2 of the metal line 18 of the lead wiring portion 16. The insulating portion 20 increases and the light transmittance increases as it goes to the end portion of the transparent substrate 12, but the light transmittance of the entire touch switch is made uniform by increasing the light transmittance of the touch electrode portion 14. To do.

タッチ電極部１４の金属線幅ｄ１と引き出し配線部１６の金属線幅ｄ２の比は、引き出し配線部の幅ｄ３と絶縁部２０の幅ｄ４との比で決定する。これは、透明基板１２の端部で引き出し配線部１６と絶縁部２０とが交互に並ぶためである。絶縁部２０によって光透過率が高まる分、タッチ電極部１４で光透過率を上げる。例えば、引き出し配線部１６の幅ｄ３に対する絶縁部２０の幅ｄ４が２０％であるとする。この場合、タッチ電極部１４の金属線幅ｄ１に対して引き出し配線部１６の金属線幅ｄ２を２０％広げる。引き出し配線部１６の幅ｄ３と絶縁部２０の幅ｄ４との比と同じ分だけタッチ電極部１４に対する引き出し配線部１６の金属線幅ｄ２が広がる。   The ratio between the metal line width d1 of the touch electrode portion 14 and the metal line width d2 of the lead wiring portion 16 is determined by the ratio of the width d3 of the lead wiring portion and the width d4 of the insulating portion 20. This is because the lead-out wiring portions 16 and the insulating portions 20 are alternately arranged at the end portion of the transparent substrate 12. Since the light transmittance is increased by the insulating portion 20, the light transmittance is increased by the touch electrode portion. For example, it is assumed that the width d4 of the insulating portion 20 with respect to the width d3 of the lead-out wiring portion 16 is 20%. In this case, the metal line width d2 of the lead wiring part 16 is increased by 20% with respect to the metal line width d1 of the touch electrode part 14. The metal line width d2 of the lead-out wiring part 16 with respect to the touch electrode part 14 increases by the same amount as the ratio between the width d3 of the lead-out wiring part 16 and the width d4 of the insulating part 20.

金属線幅ｄ１，ｄ２を決定するに当たって、タッチ電極部１４または引き出し配線部１６のいずれかが所望の光透過率になるように金属線幅ｄ１，ｄ２を決定し、他方の金属線幅ｄ１，ｄ２をそれに合わせて変化させる。例えば、タッチ電極部１４の金属線幅ｄ１は約５〜５０μｍである。   In determining the metal line widths d1 and d2, the metal line widths d1 and d2 are determined so that either the touch electrode part 14 or the lead-out wiring part 16 has a desired light transmittance, and the other metal line widths d1 and d2 are determined. Change d2 accordingly. For example, the metal line width d1 of the touch electrode portion 14 is about 5 to 50 μm.

金属線１８の幅ｄ１，ｄ２を異ならせる以外に、図４、図５に示すように、タッチ電極部１４の金属線同士のピッチｄ５と引き出し配線部１６とで金属線同士のピッチｄ６を異ならせても良い。そのピッチｄ５，ｄ６が異なることにより、タッチ電極部１４と引き出し配線部１６とで光の透過率が異なる。実施例１と同様に、タッチ電極部１４の光透過率が引き出し配線部１６よりも高くなるようにする。   In addition to making the widths d1 and d2 of the metal wires 18 different, as shown in FIGS. 4 and 5, if the pitch d5 between the metal wires of the touch electrode portion 14 and the pitch d6 between the metal wires are different between the lead-out wiring portions 16, as shown in FIGS. May be allowed. Because the pitches d5 and d6 are different, the light transmittance is different between the touch electrode portion 14 and the lead-out wiring portion 16. Similar to the first embodiment, the light transmittance of the touch electrode portion 14 is made higher than that of the lead wiring portion 16.

実施例１と同様に、ピッチｄ５とピッチｄ６の比は、引き出し配線部１６の幅ｄ３と絶縁部２０の幅ｄ４との比で決定する。例えば、引き出し配線部１６の幅ｄ３に対する絶縁部２０の幅ｄ４が２０％であるとする。この場合、タッチ電極部１４の金属線同士のピッチｄ５に対して引き出し配線部１６の金属線同士のピッチｄ６を２０％狭める。タッチ電極部１４の金属線１８が引き出し配線部１６の金属線１８よりも粗になる分、引き出し配線部１６よりも光透過率が高くなる。引き出し配線部１６の幅ｄ３と絶縁部２０の幅ｄ４の比と同じ分だけピッチｄ５に対するピッチｄ６が狭まる。   As in the first embodiment, the ratio between the pitch d5 and the pitch d6 is determined by the ratio between the width d3 of the lead-out wiring portion 16 and the width d4 of the insulating portion 20. For example, it is assumed that the width d4 of the insulating portion 20 with respect to the width d3 of the lead-out wiring portion 16 is 20%. In this case, the pitch d6 between the metal wires of the lead-out wiring portion 16 is narrowed by 20% with respect to the pitch d5 between the metal wires of the touch electrode portion 14. Since the metal wire 18 of the touch electrode portion 14 is rougher than the metal wire 18 of the lead wiring portion 16, the light transmittance is higher than that of the lead wiring portion 16. The pitch d6 with respect to the pitch d5 is reduced by the same amount as the ratio of the width d3 of the lead-out wiring portion 16 and the width d4 of the insulating portion 20.

タッチ電極部１４と引き出し配線部１６との接続箇所では、金属線１８同士のピッチｄ５，ｄ６が異なることによりタッチ電極部１４と引き出し配線部１６とが電気的に接続されないおそれがある。したがって、少なくとも一方の金属線１８を他方の金属線１８のある箇所まで延長し、互いの金属線１８を接続させる。   There is a possibility that the touch electrode portion 14 and the lead-out wiring portion 16 are not electrically connected to each other at the connection portion between the touch electrode portion 14 and the lead-out wiring portion 16 because the pitches d5 and d6 of the metal wires 18 are different. Therefore, at least one of the metal wires 18 is extended to a place where the other metal wire 18 is located, and the metal wires 18 are connected to each other.

ピッチｄ５，ｄ６の決定は実施例１の金属線幅ｄ１，ｄ２の決定方法と同様である。タッチ電極部１４または引き出し配線部１６のいずれかが所望の光透過率になるようにピッチｄ５，ｄ６を決定し、他方のピッチｄ５，ｄ６をそれに合わせて変化させる。例えば、タッチ電極部１４の金属線同士のピッチｄ５は約１００〜１０００μｍである。   The determination of the pitches d5 and d6 is the same as the method for determining the metal line widths d1 and d2 in the first embodiment. The pitches d5 and d6 are determined so that either the touch electrode portion 14 or the lead-out wiring portion 16 has a desired light transmittance, and the other pitches d5 and d6 are changed accordingly. For example, the pitch d5 between the metal wires of the touch electrode portion 14 is about 100 to 1000 μm.

タッチ電極部１４と引き出し配線部１６とで金属線１８の幅ｄ１，ｄ２と金属線同士のピッチｄ５，ｄ６の両方を異ならせても良い。すなわち、実施例１と実施例２を組み合わせた構成であっても良い。引き出し配線部１６はタッチ電極部１４よりも金属線１８の幅ｄ２が細く、金属線同士のピッチｄ６も狭くなる。   Both the widths d1 and d2 of the metal wires 18 and the pitches d5 and d6 between the metal wires may be different between the touch electrode portion 14 and the lead-out wiring portion 16. That is, the structure which combined Example 1 and Example 2 may be sufficient. In the lead-out wiring part 16, the width d2 of the metal line 18 is narrower than that of the touch electrode part 14, and the pitch d6 between the metal lines is also narrowed.

タッチスイッチ１０の設計によっては、タッチ電極部１４同士、引き出し配線部１６同士、タッチ電極部１４と引き出し配線部１６の間隔が広くなる場合がある。例えば、図６（ａ）、（ｂ）のような構成である。間隔が広くなりすぎると、絶縁部２０が広くなりすぎ、タッチ電極部１４や引き出し配線部１６が視認され、ディスプレイの表示品位が低下する。この場合、タッチ電極部１４同士、タッチ電極部１４と引き出し配線部１６との間に中間部２２を設ける。中間部２２のアースへの接続の有無は問わない。中間部２２は、電気的にタッチ電極部１４や引き出し配線部１６のいずれにも接続されない。   Depending on the design of the touch switch 10, the distance between the touch electrode portions 14, the lead-out wiring portions 16, and the distance between the touch electrode portion 14 and the lead-out wiring portion 16 may increase. For example, the configuration is as shown in FIGS. If the interval becomes too wide, the insulating portion 20 becomes too wide, the touch electrode portion 14 and the lead-out wiring portion 16 are visually recognized, and the display quality of the display is deteriorated. In this case, the intermediate portion 22 is provided between the touch electrode portions 14 and between the touch electrode portion 14 and the lead wiring portion 16. It does not matter whether the intermediate portion 22 is connected to ground. The intermediate portion 22 is not electrically connected to either the touch electrode portion 14 or the lead wiring portion 16.

中間部２２は図７や図８のように、金属線１８によって形成された網目状の領域である。図７や図８では、タッチ電極部１４と同じ線幅やピッチになっているが、引き出し配線部１６に合わせてもよいし、タッチ電極部１４と引き出し配線部１６の中間的な値であってもよいが、タッチ電極部１４の線幅やピッチに合わせることが好ましい。   The intermediate portion 22 is a mesh-like region formed by the metal wire 18 as shown in FIGS. 7 and 8, the line width and pitch are the same as those of the touch electrode unit 14, but may be matched to the lead-out wiring unit 16 or an intermediate value between the touch electrode unit 14 and the lead-out wiring unit 16. However, it is preferable to match the line width and pitch of the touch electrode portion 14.

図７と図８は図２と同じようにタッチ電極部１４の電極線１８の幅を細くしたが、図４と同じようにタッチ電極部１４の電極線１８同士のピッチを広げてもよい。   7 and 8 reduce the width of the electrode lines 18 of the touch electrode portion 14 as in FIG. 2, but the pitch between the electrode lines 18 of the touch electrode portion 14 may be increased as in FIG.

図２などに示すように、引き出し配線部１６の幅が一定であったが、引き出し配線部１６の幅を位置によって変えてもよい。透明基板１２の中央部から端部にいくにしたがって、連続的にもしくは段階的に引き出し配線部１６の幅を細くする。引き出し配線部１６が密集される箇所において、引き出し配線部１６の密度を下げ、また透明基板１２の中央部ほど絶縁部２０の幅を太くし、光透過率を均一にする。本実施例を上記の実施例１〜４と適宜組み合わせることによって、タッチスイッチ１０の光透過率を均一にし易くなる。   As shown in FIG. 2 and the like, the width of the lead-out wiring portion 16 is constant, but the width of the lead-out wiring portion 16 may be changed depending on the position. The width of the lead-out wiring portion 16 is reduced continuously or stepwise as it goes from the central portion to the end portion of the transparent substrate 12. In the places where the lead-out wiring portions 16 are densely packed, the density of the lead-out wiring portions 16 is reduced, and the width of the insulating portion 20 is increased toward the central portion of the transparent substrate 12 to make the light transmittance uniform. By appropriately combining this embodiment with the above-described embodiments 1 to 4, it becomes easy to make the light transmittance of the touch switch 10 uniform.

また、引き出し配線部１６の金属線の幅を変更する以外に、絶縁部２０の幅を変更するようにしてもよい。透明基板１２の中央部に向かうにしたがって、絶縁部２０の幅を広げる。透明基板１２の端部ほど絶縁部２０が多いため、透明基板１２の中央部において絶縁部２０の幅を広げて光透過率を均一にする。   In addition to changing the width of the metal line of the lead-out wiring portion 16, the width of the insulating portion 20 may be changed. The width of the insulating part 20 is increased toward the center of the transparent substrate 12. Since there are many insulating parts 20 as the edge part of the transparent substrate 12, the width | variety of the insulating part 20 is expanded in the center part of the transparent substrate 12, and the light transmittance is made uniform.

上述した引き出し配線部１６の幅の変化と絶縁部２０の幅の変化は、一方のみを実施するのではなく、適宜両方を組み合わせてもよい。   The above-described change in the width of the lead-out wiring portion 16 and the change in the width of the insulating portion 20 are not limited to one, but may be combined as appropriate.

以上のように、タッチ電極部１４と引き出し配線部１６とで金属線１８の幅ｄ１，ｄ２、金属線同士のピッチｄ５，ｄ６、またはその両方を異ならせることによって、タッチスイッチ１０の全域で光の透過率を均一化することができる。ディスプレイの前面にタッチスイッチ１０を配置しても、表示品位を下げにくい。従来と比べて、特にディスプレイで均一な色彩を表示したときに、タッチスイッチ１０のタッチ電極部１４や引き出し配線部１６が視認されにくい。   As described above, by changing the widths d1 and d2 of the metal wires 18 and the pitches d5 and d6 between the metal wires, or both, between the touch electrode portion 14 and the lead-out wiring portion 16, light can be emitted over the entire area of the touch switch 10. The transmittance can be made uniform. Even if the touch switch 10 is arranged on the front surface of the display, it is difficult to lower the display quality. Compared with the prior art, the touch electrode portion 14 and the lead-out wiring portion 16 of the touch switch 10 are less visible, especially when a uniform color is displayed on the display.

その他、本発明は、その主旨を逸脱しない範囲で当業者の知識に基づき種々の改良、修正、変更を加えた態様で実施できるものである。   In addition, the present invention can be carried out in a mode in which various improvements, modifications, and changes are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention.

１０：タッチスイッチ
１２：透明基板
１４：タッチ電極部
１６：引き出し配線部
１８：金属線
２０：絶縁部
２２：中間部 10: Touch switch 12: Transparent substrate 14: Touch electrode portion 16: Lead-out wiring portion 18: Metal wire 20: Insulating portion 22: Intermediate portion

Claims (7)

基板と、
前記基板の一面に金属線を網目状にして形成された複数のタッチ電極部と、
前記基板の一面に金属線を網目状にして形成され、それぞれのタッチ電極部から基板の端部に引き出された引き出し配線部と、
を備え、
前記タッチ電極部と引き出し配線部とで金属線の幅、金属線同士のピッチ、またはその両方を異ならせたタッチスイッチ。 A substrate,
A plurality of touch electrode portions formed on one surface of the substrate with a metal wire mesh;
A metal wire is formed on one surface of the substrate in a mesh shape, and a lead-out wiring portion led out from each touch electrode portion to the end of the substrate;
With
A touch switch in which a width of a metal wire, a pitch between metal wires, or both are different between the touch electrode portion and the lead-out wiring portion. 前記タッチ電極部と引き出し配線部とで金属線の幅、金属線同士のピッチ、またはその両方を異ならせてタッチスイッチ全域の光透過率を均一にした請求項１のタッチスイッチ。 2. The touch switch according to claim 1, wherein the light transmittance of the entire touch switch is made uniform by changing the width of the metal lines, the pitch between the metal lines, or both of the touch electrode portion and the lead-out wiring portion. 前記引き出し配線部同士の間に絶縁部が形成されており、引き出し配線部の幅と絶縁部の幅の比率に応じて、タッチ電極部と引き出し配線部とは、金属線の幅、金属線同士のピッチ、またはその両方が異なる請求項１または２のタッチスイッチ。 An insulating part is formed between the lead-out wiring parts, and the touch electrode part and the lead-out wiring part have a width of the metal line, and between the metal lines according to the ratio of the width of the lead-out wiring part and the width of the insulating part. The touch switch according to claim 1 or 2, wherein pitches of the two or both are different. 前記金属線の幅は、引き出し配線部よりもタッチ電極部の方が細い請求項１から３のいずれかのタッチスイッチ。 4. The touch switch according to claim 1, wherein the width of the metal line is narrower in the touch electrode portion than in the lead-out wiring portion. 前記金属線同士のピッチは、引き出し配線部よりもタッチ電極部の方が広い請求項１から４のいずれかのタッチスイッチ。 The touch switch according to any one of claims 1 to 4, wherein the pitch between the metal wires is wider in the touch electrode portion than in the lead-out wiring portion. 前記引き出し配線部の金属線の幅は、基板の端部から中央部にいくにしたがって幅が細くなる請求項１から５のいずれかのタッチスイッチ。 The touch switch according to any one of claims 1 to 5, wherein the width of the metal line of the lead-out wiring portion becomes narrower from an end portion of the substrate toward a central portion. 前記絶縁部の幅は、基板の中央部から端部にいくにしたがって幅が狭くなる請求項３から６のいずれかのタッチスイッチ。 The touch switch according to any one of claims 3 to 6, wherein the width of the insulating portion becomes narrower from the center portion to the end portion of the substrate.
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