JP2005302447A - Key seat and fixed structure of key seat - Google Patents

Key seat and fixed structure of key seat Download PDF

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Publication number
JP2005302447A
JP2005302447A JP2004114676A JP2004114676A JP2005302447A JP 2005302447 A JP2005302447 A JP 2005302447A JP 2004114676 A JP2004114676 A JP 2004114676A JP 2004114676 A JP2004114676 A JP 2004114676A JP 2005302447 A JP2005302447 A JP 2005302447A
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key
sheet
key sheet
rubber
fixed
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JP4486395B2 (en
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Daisuke Nakajima
大介 中嶋
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Polymatech Co Ltd
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Polymatech Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00Layers
    • H01H2209/006Force isolators
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2209/00Layers
    • H01H2209/01Increasing rigidity; Anti-creep
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00Manufacturing
    • H01H2229/044Injection moulding
    • H01H2229/048Insertion moulding

Abstract

<P>PROBLEM TO BE SOLVED: To provide a key seat and a fixing structure of a key seat which are capable of suppressing as much as possible the distortion of the key seat that is a rubber-like elastic body having flexibility arranged with a plurality of keytops narrowly in between. <P>SOLUTION: The floating support part 12e made of a rubber-like elastic body adhered with a keytop 4 is supported by a support part 12f capable of pressing displacement. Then, a protrusion 12h is formed at the back side of the support part 12f and this is adhered by pressing in a recessed part 6b formed on the printed-circuit board 6. Thereby, since the base seat 12 is fixed to the printed-circuit board having rigidity, distortion of the key seat 11 can be suppressed as much as possible. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

この発明は、携帯電話機、PDA、カーナビゲーション装置、カーオーディオ装置など各種機器の操作部に用いる押釦スイッチ用のキーシートに関し、特に機器の筐体に形成した仕切桟の無い操作開口から複数のキートップを露出させて使用するのに好適なキーシートに関する。   The present invention relates to a key sheet for a push button switch used in an operation unit of various devices such as a mobile phone, a PDA, a car navigation device, and a car audio device, and more particularly, a plurality of keys from an operation opening without a partition rail formed in a device casing. The present invention relates to a key sheet suitable for use with the top exposed.

図9で示す携帯電話機1のように、装置全体や操作部の小型化の要請、またデザイン性の要請などから、筐体2に形成した仕切桟の無い操作開口2aから、キーシート3の複数のキートップ4が狭間配置で露出する押釦スイッチが要求されている。この背景技術によるキーシート3は、図10で示すように、シリコーンゴムでなるベースシート5に、複数すなわち計17個のキートップ4を固着したものである。即ち、中央上部にある大型で上下左右の方向入力を行う1個のキートップ4aと、その左右にある小型で4個のキーットップ4b、それらの下側にある12個の中型のキートップ4cとで構成される。隣り合うキートップ4a,4b,4cどうしの間隔は大変狭く、例えば0.15mm〜0.2mm程度の狭間で配置してあり、操作開口2aとの隙間も同程度で大変狭くなっている。こうした狭間配置のキーシート3の関連技術については、例えば特許文献1に記載されている。
特願2003−114833
Like the cellular phone 1 shown in FIG. 9, a plurality of key sheets 3 are formed from the operation opening 2 a formed in the housing 2 without a partition rail in response to a request for downsizing of the entire device or the operation unit, a request for design, or the like. There is a demand for a pushbutton switch in which the key top 4 is exposed in a narrow space. As shown in FIG. 10, the key sheet 3 according to this background art is obtained by fixing a plurality of, ie, a total of 17 key tops 4 to a base sheet 5 made of silicone rubber. That is, one large key top 4a for inputting a vertical and horizontal direction at the center upper part, four small key tops 4b on the left and right sides thereof, and 12 medium key tops 4c below them. It consists of. The interval between the adjacent key tops 4a, 4b, 4c is very narrow, for example, between 0.15 mm and 0.2 mm, and the gap with the operation opening 2a is also the same and very narrow. The related art of the key sheet 3 having such a narrow arrangement is described in Patent Document 1, for example.
Japanese Patent Application No. 2003-114833

このようなキーシート3の取付構造は、図11で示すように、筐体2の内部の構造要素、この背景技術では、筐体2の裏面2bにおける操作開口2aの開口縁側部分と筐体2に内蔵する硬質のプリント基板6とで、ベースシート5の外縁側部分を、全周にわたって圧接して保持した構造であり、圧接部分の内側では筐体2やプリント基板6に対して拘束しない取付構造となっている。   As shown in FIG. 11, such a mounting structure of the key sheet 3 is a structural element inside the housing 2, in this background art, the opening edge side portion of the operation opening 2 a on the back surface 2 b of the housing 2 and the housing 2. It is a structure in which the outer edge side portion of the base sheet 5 is pressed and held over the entire circumference with the hard printed circuit board 6 built in the housing, and is attached to the casing 2 and the printed circuit board 6 inside the pressure contact portion. It has a structure.

このため、携帯電話機1の使用時にキーシート3を、例えば図12のように直立させたり、図13のように下向きに倒すと、柔軟なシリコーンゴムでなるベースシート5が、キーットップ4の重量負荷によって、全体的に延びて歪んでしまうことがある。このようにキーシート3が全体的に歪んでしまうと、ベースシート5の押し子5aと、プリント基板6の金属皿ばねと接点回路でなる接点スイッチ6aと、の間に位置ずれが生じて、キートップ4を押圧しても入力出来なかったり、なかなか入力出来ない、という操作不良が生じることがある。また、ベースシート5の歪みの態様に応じてキートップ4ごとに入力時の押圧ストローク量が異なって、操作性に悪影響を及ぼすことがある。更に、携帯電話機1の見栄えを損ねてしまう、という問題もある。また、隣接する一方のキートップ4が横滑りして他方のキートップ4の下に潜り込んでしまうことがある。   Therefore, when the mobile phone 1 is used, if the key sheet 3 is erected as shown in FIG. 12, for example, or is tilted downward as shown in FIG. Depending on the load, it may extend and become distorted as a whole. Thus, when the key sheet 3 is distorted as a whole, a displacement occurs between the pusher 5a of the base sheet 5 and the contact switch 6a formed of a metal disc spring and a contact circuit of the printed circuit board 6, An operation failure may occur in which it is impossible to input even if the key top 4 is pressed, or it is difficult to input. In addition, the pressing stroke amount at the time of input differs for each key top 4 depending on the distortion mode of the base sheet 5, and the operability may be adversely affected. Furthermore, there is a problem that the appearance of the mobile phone 1 is impaired. Also, one adjacent key top 4 may slide sideways and sink under the other key top 4.

以上のような柔軟なゴム状弾性体でなるベースシート5の歪みに起因する問題は、図示のような操作開口2aからすべてのキートップ4を狭間配置で露出させるキーシート3について、特に解決すべき問題である。しかしながら、こうした諸問題は、例えば、筐体2に、上下に位置するキートップ4bについて一つの操作開口を設けるような場合、つまり単一の操作開口あたりに配置するキートップが2つ以上であれば起こりうる。また、携帯電話機1のごとく使用時に直立させたり傾倒させることが想定されない機器に、複数のキートップを狭間配置したキーシートを取りつけた場合であっても、柔軟性あるゴム状弾性体でなるベースシートの歪みを起因として、キートップどうしの潜り込み等の問題が起こりうるため、これらのキーシートについても同様に、その対応策が要請されている。   The problem caused by the distortion of the base sheet 5 made of a flexible rubber-like elastic body as described above is particularly solved for the key sheet 3 that exposes all the key tops 4 through the operation openings 2a as illustrated. It should be a problem. However, for example, these problems may occur when the casing 2 is provided with one operation opening for the top and bottom key tops 4b, that is, when there are two or more key tops arranged per single operation opening. Can happen. Further, even when a key sheet having a plurality of key tops arranged in a narrow manner is attached to a device that is not expected to stand upright or tilt like the mobile phone 1, a base made of a flexible rubber-like elastic body is used. Since problems such as the penetration of key tops may occur due to sheet distortion, countermeasures are similarly demanded for these key sheets as well.

以上のような技術を背景になされたのが本発明である。その目的は、複数のキートップを狭間配置した柔軟性のあるゴム状弾性体でなるキーシートの歪みを可及的に抑制することにある。   The present invention has been made against the background of the above technique. The purpose is to suppress as much as possible the distortion of the key sheet made of a flexible rubber-like elastic body in which a plurality of key tops are arranged narrowly.

前記目的を達成すべく本発明は、ベースシートと、ベースシートに狭間配置されて機器の筐体に形成した仕切桟の無い操作開口から露出させる複数のキートップとを備えるキーシートについて、キーシートに、該キートップをそれぞれ固着するゴム状弾性体でなる複数の浮動支持部を押圧変位可能に支持する支持部を設け、該支持部の裏面に、前記筐体内で固定配置される剛性部材に固定する固定部を設けるものとした。   In order to achieve the above object, the present invention provides a key sheet comprising a base sheet and a plurality of key tops that are disposed between the base sheet and formed in a housing of the device so as to be exposed from an operation opening without a partition rail. Provided with a support part that supports a plurality of floating support parts made of rubber-like elastic bodies to which the key tops are fixed, respectively, so that the key tops can be pressed and displaced, and a rigid member fixedly arranged in the housing on the back surface of the support part. A fixing part to be fixed was provided.

本発明のキーシートによれば、ベースシートが、支持部の裏面に設けた固定部によって、筐体内で固定配置される剛性部材に対し固定されるため、ベースシートの歪みが殆ど無くなるか皆無にすることができる。なお、本発明のキーシートを固定する剛性部材は、機器内における剛性要素、具体的には筐体、硬質のプリント基板、硬質の導光板などにて構成できる。   According to the key sheet of the present invention, since the base sheet is fixed to the rigid member fixedly arranged in the housing by the fixing portion provided on the back surface of the support portion, the distortion of the base sheet is almost eliminated or not. can do. The rigid member for fixing the key sheet of the present invention can be constituted by a rigid element in the device, specifically, a casing, a rigid printed board, a rigid light guide plate, or the like.

前記キーシートの固定部は、剛性部材に設けた凹部に対し圧入により固着する突起であるか、又は剛性部材に設けた突起が圧入により固着する凹部か、の少なくとも何れかとして構成される。   The fixing portion of the key sheet is configured as at least one of a protrusion that is fixed by press-fitting to a recess provided in the rigid member, or a recess that is fixed by press-fitting the protrusion provided on the rigid member.

本発明によれば、キーシートの突起を剛性部材の凹部に圧入するか、又はキーシートの凹部に剛性部材の突起を圧入することで、キーシートを剛性部材に対して容易に固定することが可能である。そして、このような突起と凹部による固定部は、具体的には次のように構成することができる。   According to the present invention, the key sheet can be easily fixed to the rigid member by press-fitting the protrusion of the key sheet into the recess of the rigid member or by pressing the protrusion of the rigid member into the recess of the key sheet. Is possible. And the fixed part by such a protrusion and a recessed part can be specifically comprised as follows.

その一つは、支持部を浮動支持部と一体のゴム状弾性体にて形成し、該支持部の裏面に前記固定部を形成する構成である。これによれば、固定部がゴム状弾性体にて支持部と一体形成されるため、固定部として機能させる別部品をベースシートに取付ける必要がなく部品点数を少なくできる。また、突起又は凹部でなる固定部がゴム状弾性体であるため、固定対象となる相手方の形状に追従変形するゴム状弾性によって圧入による固定を強固にできる。そして、ゴム状弾性体を透明なものとして構成すれば、上記キーシートを照光式キーシートとした場合に、支持部の内部に固定部として機能する他の部材が不要であり導光機能が妨げられないため、該キーシートを導光板としても機能させることができる。   One of them is a structure in which the support part is formed of a rubber-like elastic body integrated with the floating support part, and the fixing part is formed on the back surface of the support part. According to this, since the fixing portion is integrally formed with the support portion by the rubber-like elastic body, it is not necessary to attach another component that functions as the fixing portion to the base sheet, and the number of components can be reduced. In addition, since the fixing portion formed by the protrusion or the recess is a rubber-like elastic body, the fixing by press-fitting can be strengthened by the rubber-like elasticity that follows and deforms the shape of the counterpart to be fixed. If the rubber-like elastic body is configured to be transparent, when the key sheet is an illuminated key sheet, no other member functioning as a fixing portion is required inside the support portion, and the light guiding function is hindered. Therefore, the key sheet can function as a light guide plate.

また、他の具体的構成は、支持部を浮動支持部と一体のゴム状弾性体にて形成するとともに該支持部に硬質樹脂でなる補強部材を設け、該補強部材の裏面に前記固定部を形成する構成である。これによれば、硬質樹脂でなる補強部材によってゴム状弾性体でなる支持部の剛性が高まり、キーシートの歪みが起こり難くなり、剛性部材に対するキーシートの固定も容易に行える。   In another specific configuration, the support portion is formed of a rubber-like elastic body integrated with the floating support portion, and a reinforcing member made of a hard resin is provided on the support portion, and the fixing portion is provided on the back surface of the reinforcing member. It is the structure to form. According to this, the rigidity of the support portion made of the rubber-like elastic body is increased by the reinforcing member made of the hard resin, the key sheet is hardly distorted, and the key sheet can be easily fixed to the rigid member.

さらに他の具体的構成は、支持部を硬質樹脂でなる補強部材として形成し、該補強部材の裏面に前記固定部を形成する構成である。これによれば、支持部が硬質樹脂でなる補強部材で形成されるため、キーシートの歪みが起こり難くなり、剛性部材に対するキーシートの固定も容易に行える。なお、固定部を有する補強部材を透明な硬質樹脂にて形成すれば、上記キーシートを照光式キーシートとした場合に、補強部材の内部に固定部として機能する他の部材が不要であるため導光機能が妨げられることなく、該補強部材を導光板としても機能させることができる。   Still another specific configuration is a configuration in which the support portion is formed as a reinforcing member made of a hard resin, and the fixing portion is formed on the back surface of the reinforcing member. According to this, since the support portion is formed of a reinforcing member made of a hard resin, the key sheet is hardly distorted, and the key sheet can be easily fixed to the rigid member. If the reinforcing member having the fixing portion is formed of a transparent hard resin, when the key sheet is an illuminated key sheet, no other member functioning as the fixing portion is required inside the reinforcing member. The reinforcing member can also function as a light guide plate without impeding the light guide function.

また、前記目的を達成すべく本発明は、機器の筐体に形成した仕切桟の無い操作開口から露出させる複数のキートップを狭間配置したキーシートを、該複数のキートップを狭間配置した領域内で、キーシートの裏面と対向し該筐体内で固定配置される剛性部材に対し、固定したキーシートの固定構造を提供する。   In order to achieve the above object, the present invention provides a key sheet in which a plurality of key tops that are exposed from an operation opening without a partition rail formed in a housing of a device are arranged narrowly, and a region in which the plurality of key tops are arranged in a narrow space A fixing structure of the key sheet that is fixed to a rigid member that faces the back surface of the key sheet and is fixedly arranged in the housing is provided.

本発明によれば、キーシートを、ベースシートの歪みが起こりやすい複数のキートップを狭間配置した領域内で剛性部材に固定するため、該領域内で効果的にベースシートの歪みの発生を殆ど無くせるか皆無にできる。なお、本発明における剛性部材は、機器内における剛性要素、具体的には筐体、硬質のプリント基板、硬質の導光板などにて構成できる。   According to the present invention, since the key sheet is fixed to the rigid member in a region where a plurality of key tops that are likely to be distorted of the base sheet are arranged narrowly, the occurrence of distortion of the base sheet is effectively prevented in the region. It can be lost or eliminated. In addition, the rigid member in the present invention can be configured by a rigid element in the device, specifically, a casing, a rigid printed board, a rigid light guide plate, or the like.

前記キーシートの固定構造は、キーシート又は剛性部材の何れか一方に突起を設け、前記何れか他方に凹部を設け、突起と凹部の圧入による固着により、キーシートを剛性部材に固定する構造とした。   The key sheet fixing structure has a structure in which a protrusion is provided on one of the key sheet and the rigid member, a recess is provided on the other, and the key sheet is fixed to the rigid member by fixing the protrusion and the recess by press-fitting. did.

本発明によれば、キーシートと剛性部材とを、凹部に対する突起の圧入により容易に固定することができる。そして、こうした突起と凹部による固定構造の具体的構成は、前述した本発明のキーシートによる3つの具体的構成を適用することができる。   According to the present invention, the key sheet and the rigid member can be easily fixed by press-fitting protrusions into the recesses. And the three specific structures by the key sheet | seat of this invention mentioned above can be applied to the specific structure of the fixing structure by such protrusion and a recessed part.

本発明のキーシートによれば、支持部の裏面が剛性部材に固定されてベースシートの歪みを抑制できるため、ベースシートの歪みに起因する諸問題、すなわち、キートップと接点スイッチとの位置ずれによる操作不良、キートップごとに押圧ストローク量が相違することによる操作性の悪化、機器のデザイン性への悪影響、キートップどうしの潜り込みが殆ど無くなるか皆無にできる。   According to the key sheet of the present invention, since the back surface of the support portion is fixed to the rigid member and distortion of the base sheet can be suppressed, various problems due to the distortion of the base sheet, that is, misalignment between the key top and the contact switch It is possible to eliminate the operation failure due to the key top, the deterioration in operability due to the difference in the amount of pressing stroke for each key top, the adverse effect on the design of the device, and the almost no sneaking between the key tops.

以下、本発明の実施形態の例について図面を参照しつつ説明する。なお、従来技術と共通する構成、各実施形態で共通する構成については、重複説明を省略する。なお、以下の説明では、「機器」として従来技術の説明と同様に携帯電話機1に適用する押釦スイッチ用のキーシートを例に説明する。   Hereinafter, examples of embodiments of the present invention will be described with reference to the drawings. In addition, duplication description is abbreviate | omitted about the structure which is common in a prior art, and the structure which is common in each embodiment. In the following description, a “button” key sheet for a push button switch applied to the mobile phone 1 will be described as an example of “device” as in the description of the related art.

第1実施形態〔図1,図2〕; 第1実施形態のキーシート11は、ベースシート12と、ベースシート12に固着したキートップ4とで構成される。ベースシート12は、図1で示すように、上部に矩形状の舌片部を有する角丸長方形状となっており、全体がゴム状弾性体の型成形によって形成されている。 First Embodiment [FIGS. 1 and 2] ; The key sheet 11 of the first embodiment is composed of a base sheet 12 and a key top 4 fixed to the base sheet 12. As shown in FIG. 1, the base sheet 12 has a rounded rectangular shape with a rectangular tongue piece at the top, and is entirely formed by molding a rubber-like elastic body.

ベースシート12を成すゴム状弾性体としては、反撥弾性の良い、シリコーンゴム、イソプレンゴム、エチレンプロピレンゴム、ブタジエンゴム、クロロプレンゴム、天然ゴム等の熱硬化性エラストマーを使用できる。また、スチレン系、エステル系、ウレタン系、オレフィン系、アミド系、ブタジエン系、エチレン−酢酸ビニル系、フッ素ゴム系、イソプレン系、塩素化ポリエチレン系等の熱可塑性エラストマーも使用できる。これらのうち、シリコーンゴム、スチレン系熱可塑性エラストマー、エステル系熱可塑性エラストマーであれば、特に良好な反撥弾性と高い耐久性を持つキーシート11が得られる。   As the rubber-like elastic body constituting the base sheet 12, thermosetting elastomers such as silicone rubber, isoprene rubber, ethylene propylene rubber, butadiene rubber, chloroprene rubber, and natural rubber, which have good resilience, can be used. Also, thermoplastic elastomers such as styrene, ester, urethane, olefin, amide, butadiene, ethylene-vinyl acetate, fluororubber, isoprene, and chlorinated polyethylene can be used. Among these, if it is silicone rubber, a styrene-type thermoplastic elastomer, and ester-type thermoplastic elastomer, the key sheet 11 with especially favorable rebound resilience and high durability will be obtained.

ベースシート12の表面12aは、図2で示すように、凹凸のない平坦面として形成されており、ゴム状弾性体の使用量の低減による重量軽減と、キートップ3の固着部分における薄肉化による薄型化とが達成されている。   As shown in FIG. 2, the surface 12 a of the base sheet 12 is formed as a flat surface without unevenness, and is reduced in weight by reducing the amount of rubber-like elastic material used, and by reducing the thickness at the fixing portion of the key top 3. Thinning has been achieved.

ベースシート12の裏面12bには、中央に円柱状の押し子12cを下向きに突設した複数の凹部12dが形成されている。凹部12dの形成部分におけるゴム状弾性体の肉厚は薄く、この薄肉部分が、各キートップ4を押圧変位可能に支持する浮動支持部12eとなっている。浮動支持部12eの表面には、高さのある接着部13によって、キートップ4の裏面3dが固着される。接着部13は、浮動支持部12eの全面に塗布されず、浮動支持部12eの面内に部分的に塗布されて硬化する。このように接着部13を浮動支持部12eの面積よりも小さく設定することで、キートップ3を押圧すれば、浮動支持部12eがその外周側で弾性変形して変位できるようになっている。したがって、ベースシート12の表面12aに、キートップ4の裏面3dを該表面12aから浮かせた状態で固着する厚肉の凸部を形成する必要がなく、厚肉の凸部が不要な分、ベースシート12の薄肉化と重量軽減が達成されている。   On the back surface 12b of the base sheet 12, a plurality of recesses 12d are formed with a cylindrical pusher 12c protruding downward at the center. The thickness of the rubber-like elastic body at the portion where the recess 12d is formed is thin, and this thin portion serves as a floating support portion 12e that supports each keytop 4 so as to be capable of being pressed and displaced. The back surface 3d of the key top 4 is fixed to the surface of the floating support portion 12e by the adhesive portion 13 having a height. The adhesive portion 13 is not applied to the entire surface of the floating support portion 12e, but is partially applied to the surface of the floating support portion 12e and cured. Thus, by setting the bonding portion 13 to be smaller than the area of the floating support portion 12e, when the key top 3 is pressed, the floating support portion 12e can be elastically deformed and displaced on its outer peripheral side. Therefore, it is not necessary to form a thick convex portion on the front surface 12a of the base sheet 12 so that the back surface 3d of the key top 4 is floated from the front surface 12a. Thinning and weight reduction of the sheet 12 are achieved.

各浮動支持部12eの外側には、それらを取り囲む厚肉の支持部12fが形成されている。したがって、各浮動支持部12eは、プリント基板6の表面から離れた上方位置で、厚肉の支持部12fにより押圧変位可能に支持されることになる。   On the outside of each floating support portion 12e, a thick support portion 12f surrounding them is formed. Accordingly, each floating support portion 12e is supported by the thick support portion 12f so as to be capable of being pressed and displaced at an upper position away from the surface of the printed circuit board 6.

支持部12fには、プリント基板6に実装した照光用光源となるLED素子の収容凹部12gが形成されている。また、支持部12fには、複数箇所に、下向きに突出する突起12hが「固定部」として形成されている。これらの突起12hは、「剛性部材」としてのプリント基板6に「固定部」として形成した、突起12hの外面形状よりもやや小さな内面形状の凹部6bに対し、圧入によって凹凸嵌合するようになる。   The support portion 12f is formed with an accommodation recess 12g for an LED element that serves as an illumination light source mounted on the printed circuit board 6. In addition, the support portion 12f has protrusions 12h protruding downward as “fixed portions” at a plurality of locations. These protrusions 12h are fitted into a concave and convex portion by press-fitting into a concave portion 6b formed as a “fixed portion” on the printed circuit board 6 as a “rigid member” and having an inner shape slightly smaller than the outer surface shape of the protrusion 12h. .

そして、こうした突起12hと凹部6bによる凹凸嵌合が、ベースシート12におけるキートップ4を狭間配置した領域内で、支持部12fにおいてなされることで、ベースシート12がプリント基板6に対してしっかり固定されて、携帯電話機1を直立させたり傾倒させても、キーシート11の歪みの発生を抑制することができるようになる。したがって、押し子12cと接点スイッチ6aとの位置ずれによる操作不良、押圧ストローク量の相違による操作感の悪化、携帯電話機1のデザイン性への悪影響、隣り合うキートップ4どうしの潜り込みを無くすことができるようになる。   Then, the concave / convex fitting by the projection 12h and the concave portion 6b is performed in the support portion 12f in the region where the key tops 4 are arranged in the base sheet 12 so that the base sheet 12 is firmly fixed to the printed circuit board 6. Thus, even if the cellular phone 1 is upright or tilted, the occurrence of distortion of the key sheet 11 can be suppressed. Accordingly, it is possible to eliminate the operation failure due to the positional deviation between the pusher 12c and the contact switch 6a, the deterioration of the operational feeling due to the difference in the pressing stroke amount, the adverse effect on the design of the mobile phone 1, and the intrusion between the adjacent key tops 4. become able to.

また、この実施形態のベースシート12は、突起12hを含めてゴム状弾性体の型成形により一体成形され、ベースシート12の肉厚内に他の部材が介在しない(例えば後述の第3実施形態参照)。したがって、収容凹部12gの内部でLED素子が放射する光を、ベースシート12の肉厚内で阻害要素無く導光させることができ、照光による各キートップ4での良好な視認性を得ることができる。   Further, the base sheet 12 of this embodiment is integrally formed by molding a rubber-like elastic body including the protrusions 12h, and no other member is interposed in the thickness of the base sheet 12 (for example, a third embodiment described later). reference). Therefore, the light radiated from the LED element inside the housing recess 12g can be guided without hindering elements within the thickness of the base sheet 12, and good visibility at each key top 4 by illumination can be obtained. it can.

第2実施形態〔図3,図4〕; 第2実施形態のキーシート14は、第1実施形態の変形例である。第1実施形態と異なる構成は、ベースシート12に、突起12hに替わる凹部12iを「固定部」として形成し、プリント基板6に、凹部6bに替わる突起6cを設けた点である。プリント基板6に設ける突起6cは、プリント基板6に外付けする別部材であり、ベースシート12と同様のゴム状弾性体や硬質樹脂にて形成することができる。そして、突起6cは、接着等によってプリント基板6に対して固定されることになる。このように、ベースシート12に凹部12iを、プリント基板6に突起6cを設けて凹凸嵌合させる固定構造としても、第1実施形態と同様の作用、効果を得ることができる。 Second Embodiment [FIGS. 3 and 4] ; The key sheet 14 of the second embodiment is a modification of the first embodiment. The configuration different from the first embodiment is that the base sheet 12 is formed with a concave portion 12i replacing the projection 12h as a “fixed portion”, and the printed board 6 is provided with a projection 6c replacing the concave portion 6b. The protrusion 6c provided on the printed circuit board 6 is a separate member externally attached to the printed circuit board 6, and can be formed of a rubber-like elastic body or hard resin similar to the base sheet 12. The protrusion 6c is fixed to the printed circuit board 6 by adhesion or the like. As described above, the same functions and effects as those of the first embodiment can be obtained even when the concave structure 12i is provided on the base sheet 12 and the projection 6c is provided on the printed circuit board 6 so that the concave and convex portions are fitted.

第3実施形態〔図5,図6〕; 第3実施形態のキーシート15は、ベースシート16の構成について、前記各実施形態と異なっている。すなわち、本実施形態のベースシート16は、硬質樹脂でなる薄板状のフレーム17を「補強部材」として備えている。フレーム17には、枠状の桟部17aによって矩形状の透孔が形成されており、この透孔を閉塞するようにゴム状弾性体でなる浮動支持部18が形成されている。浮動支持部18は、桟部17aと桟部17aの表面及び側面を被覆するゴム状弾性体とでなる支持部19によって、押圧変位可能に支持されている。 Third Embodiment [FIGS. 5 and 6] ; The key sheet 15 of the third embodiment differs from the above-described embodiments in the configuration of the base sheet 16. FIG. That is, the base sheet 16 of this embodiment includes a thin plate-like frame 17 made of a hard resin as a “reinforcing member”. A rectangular through hole is formed in the frame 17 by a frame-shaped crosspiece 17a, and a floating support portion 18 made of a rubber-like elastic body is formed so as to close the through hole. The floating support portion 18 is supported by a support portion 19 made of a crosspiece 17a and a rubber-like elastic body covering the surface and side surfaces of the crosspiece 17a so as to be capable of being pressed and displaced.

そして、枠状の桟部17aには「固定部」としての突起17bが形成されており、プリント基板6に形成した小径で底付きの凹部6bに凹凸嵌合する。突起17bには割り溝17cが形成されている。この割り溝17cは、突起17bを凹部6bに圧入した際に、その基端がプリント基板6の表面よりも上側に位置する深さで形成されている。したがって、突起17bを底付きの凹部6bに圧入する際に、割り溝17cを通気路として底付きの凹部6b内の残存空気を外部に排出できるので、突起17bを底付きの凹部6bに完全に圧入しきることができる。そして、このように突起17cを凹部6bに圧入すると、割り溝17cが狭くなる方向へ弾性的に変形する。このため、割り溝17cを拡大する方向への復元力が凹部6bに対する固定力として発揮されて、強い固定を得ることができる。   A projection 17b as a “fixing portion” is formed on the frame-shaped crosspiece portion 17a, and is concavo-convexly fitted into a concave portion 6b having a small diameter and a bottom formed on the printed circuit board 6. A split groove 17c is formed in the protrusion 17b. The split groove 17 c is formed with such a depth that its base end is located above the surface of the printed circuit board 6 when the protrusion 17 b is press-fitted into the recess 6 b. Therefore, when the projection 17b is press-fitted into the bottomed recess 6b, the remaining air in the bottomed recess 6b can be discharged to the outside using the split groove 17c as a ventilation path, so that the projection 17b is completely inserted into the bottomed recess 6b. You can press fit. When the protrusion 17c is press-fitted into the recess 6b in this way, the split groove 17c is elastically deformed in a narrowing direction. For this reason, the restoring force in the direction of enlarging the split groove 17c is exhibited as a fixing force with respect to the recess 6b, and strong fixing can be obtained.

このようなフレーム17の材質としては、剛性の高い、ポリカーボネート樹脂、ポリメチルメタクリレート樹脂、ポリプロピレン樹脂、ポリスチレン系樹脂、ポリアクリル系共重合樹脂、ポリオレフィン系樹脂、アクリロニトリルブタジエンスチレン樹脂、ポリエステル系樹脂、エポキシ系樹脂、ポリウレタン系樹脂、ポリアミド樹脂、シリコーン系樹脂を使用できる。   The material of the frame 17 is a highly rigid polycarbonate resin, polymethyl methacrylate resin, polypropylene resin, polystyrene resin, polyacrylic copolymer resin, polyolefin resin, acrylonitrile butadiene styrene resin, polyester resin, epoxy. Resin, polyurethane resin, polyamide resin, and silicone resin can be used.

次に、製造方法を説明する。ベースシート16を製造するには、予め、射出成形などの型成形によってフレーム17を得る。そして、浮動支持部18を成すゴム状弾性体として熱硬化性エラストマーを選択した場合には、その成形金型のキャビティにフレーム17を移載し、熱可塑性エラストマーを選択した場合には、その射出成形金型のキャビティにフレーム17を移載して、それぞれ型成形を行う。こうして浮動支持部18を一体成形したベースシート17が得られることになる。また、この製法ではなく、フレーム17と浮動支持部18を二色成形によって成形することもできる。この後は、各浮動支持部18に所定のキートップ4を接着することで、本形態のキーシート15が得られることになる。   Next, a manufacturing method will be described. In order to manufacture the base sheet 16, the frame 17 is obtained in advance by molding such as injection molding. When a thermosetting elastomer is selected as the rubber-like elastic body forming the floating support portion 18, the frame 17 is transferred to the cavity of the molding die, and when a thermoplastic elastomer is selected, the injection is performed. The frame 17 is transferred to the cavity of the molding die, and each is molded. In this way, the base sheet 17 integrally formed with the floating support portion 18 is obtained. Further, instead of this manufacturing method, the frame 17 and the floating support 18 can be formed by two-color molding. Thereafter, a predetermined key top 4 is bonded to each floating support portion 18 to obtain the key sheet 15 of this embodiment.

以上のようなキーシート15によれば、ゴム状弾性体でなるベースシート16が硬質樹脂でなるフレーム17によって補強されること、及びキートップ3を狭間配置した領域内でフレーム17の突起17bをプリント基板6の凹部6bに凹凸嵌合させて固定することによって、ベースシート16及びキーシート15の歪みの発生が抑制される。   According to the key sheet 15 as described above, the base sheet 16 made of a rubber-like elastic body is reinforced by the frame 17 made of hard resin, and the protrusions 17b of the frame 17 are formed in the region where the key tops 3 are arranged narrowly. The base sheet 16 and the key sheet 15 can be prevented from being distorted by fixing the concave and convex portions 6b of the printed circuit board 6 to the concave and convex portions 6b.

第4実施形態〔図7,図8〕; 第4実施形態のキーシート20は、ベースシート21の全体を硬質樹脂でなるフレーム22で構成した例である。なお、フレーム22の桟部22aにて画成される透孔には、ゴム状弾性体でなる浮動支持部23が形成される。また、フレーム22には、支持部となる桟部22aに突起22bと凹部22cが形成されており、それぞれプリント基板6の凹部6bと突起6cに対して凹凸嵌合する。そして、このキーシート20によれば、ベースシート21の全体が硬質樹脂のフレーム22にて構成されるため、キーシート20の歪みの発生をより確実に抑制することが可能である。 4th Embodiment [FIG. 7, FIG. 8] ; The key sheet | seat 20 of 4th Embodiment is the example which comprised the whole base sheet 21 with the flame | frame 22 which consists of hard resin. A floating support portion 23 made of a rubber-like elastic body is formed in the through hole defined by the crosspiece portion 22a of the frame 22. Further, the frame 22 has a projection 22b and a recess 22c formed on a crosspiece 22a serving as a support portion, and is engaged with the recess 6b and the projection 6c of the printed circuit board 6, respectively. According to the key sheet 20, since the entire base sheet 21 is composed of the hard resin frame 22, it is possible to more reliably suppress the occurrence of distortion of the key sheet 20.

実施形態の変形例; 各実施形態の変形例を列挙して説明する。 Modifications of Embodiments ; Modifications of each embodiment will be listed and described.

以上の各実施形態については、キートップ4として熱可塑性樹脂や熱硬化性樹脂、シリコーンゴムや熱可塑性エラストマー等のゴム状弾性体を材質とするものを利用できる。また、ベースシート12,16,21が凹凸嵌合によりプリント基板6に対して確実に固定されるため、重量のある金属材質のものも利用できる。また、キートップ4については、文字、数字、記号等を、インキや鍍金等で表す表示部を形成できる。更に、キートップ4については、抜き文字照光式キートップ、文字照光式キートップとして構成することもできる。また、キートップ4は他の立体形状であってもよい。   In each of the above embodiments, the key top 4 can be made of a rubber-like elastic body such as a thermoplastic resin, a thermosetting resin, silicone rubber, or a thermoplastic elastomer. In addition, since the base sheets 12, 16, and 21 are securely fixed to the printed circuit board 6 by the concave-convex fitting, heavy metal materials can be used. For the key top 4, a display unit can be formed in which characters, numbers, symbols, and the like are represented by ink, plating, or the like. Furthermore, the key top 4 can also be configured as a blank character illuminated key top or a character illuminated key top. Further, the key top 4 may have another three-dimensional shape.

前記実施形態では、浮動支持部12e,18,23について、平面視長方形としたが、丸形でも楕円形でも、その他の多角形でもよい。また、ベースシート12,16,21の形状、突起6c,12h,17b,22bと凹部6b,12i,22cの形状も、前記実施形態の例に拘わらず他の形状でもよい。また、プリント基板6の凹部6bも、底付きではなく貫通孔として形成してもよく、この場合には突起を貫通する凹部へ嵌合した後に、プリント基板6の裏面から凹部に接着剤を充填・硬化させることで、さらに強固な固定が得られる利点がある。なお、底付きの凹部6bへの嵌合時に、固定を強化する接着剤等を利用してもよいことは勿論である。また、前述のように凹部を貫通孔として形成する場合には、先端に係止爪を有する突起を用いるようにし、該係止爪を凹部の孔縁に係止させて、固定を得るようにしてもよい。本発明における「圧入により固着」とは、このような固定形態も含む趣旨である。   In the embodiment, the floating support portions 12e, 18, and 23 are rectangular in plan view, but may be round, elliptical, or other polygonal shapes. Further, the shape of the base sheets 12, 16, 21 and the shapes of the protrusions 6c, 12h, 17b, 22b and the recesses 6b, 12i, 22c may be other shapes regardless of the example of the embodiment. Further, the concave portion 6b of the printed circuit board 6 may be formed as a through hole instead of having a bottom. In this case, after fitting into the concave portion penetrating the protrusion, the concave portion is filled with an adhesive from the back surface of the printed circuit board 6. -By curing, there is an advantage that stronger fixation can be obtained. Needless to say, an adhesive or the like that reinforces fixation may be used when fitting into the recessed portion 6b with the bottom. When the recess is formed as a through-hole as described above, a protrusion having a locking claw at the tip is used, and the locking claw is locked to the hole edge of the recess to obtain fixation. May be. The term “fixed by press-fitting” in the present invention is intended to include such a fixed form.

第3実施形態では突起17bに割り溝17cがある例を示したが、この割り溝17cを、他の実施形態の突起6c,12h,22bに適用することも可能である。また、割り溝17cの基端がプリント基板6の表面よりも上側に位置する深さで形成する例を示したが、残存空気の通気路として機能させなくてもよければ、プリント基板6の板厚内に位置する深さで形成してもよい。   In the third embodiment, an example in which the projection 17b has the split groove 17c has been described. However, the split groove 17c can be applied to the projections 6c, 12h, and 22b of other embodiments. Further, the example in which the base end of the split groove 17c is formed at a depth positioned above the surface of the printed circuit board 6 is shown. However, if it is not necessary to function as a remaining air ventilation path, the board of the printed circuit board 6 can be used. You may form in the depth located in thickness.

前記各実施形態では、「剛性部材」として硬質のプリント基板6を例示したが、プリント基板6の上に、LED素子など照光用光源からの光を面方向へ伝達するための、透明な硬質樹脂でなる導光板を取付け、この導光板に突起や凹部を設けるようにしてもよい。また、携帯電話機1の筐体2が組み合わさる他方の筐体を「剛性部材」として利用することも可能である。   In each of the embodiments described above, the hard printed circuit board 6 is exemplified as the “rigid member”. However, a transparent hard resin for transmitting light from an illumination light source such as an LED element in the surface direction on the printed circuit board 6. It is also possible to attach a light guide plate and to provide a projection or a recess on the light guide plate. Further, the other casing combined with the casing 2 of the mobile phone 1 can be used as a “rigid member”.

以上の実施形態では、携帯電話機1に使用するキーシート11,14,15,20を例示したが、それ以外の機器、例えばPDAやリモートコントローラなどにも使用できる。   In the above embodiment, the key sheets 11, 14, 15, and 20 used for the mobile phone 1 are exemplified, but the present invention can be used for other devices such as a PDA and a remote controller.

第1実施形態によるベースシート裏面の外観図。The external view of the base sheet back surface by 1st Embodiment. 図1のSB−SB線に沿う拡大要部断面図。FIG. 2 is an enlarged main portion sectional view taken along line SB-SB in FIG. 1. 第2実施形態によるベースシート裏面の外観図。The external view of the base sheet back surface by 2nd Embodiment. 図3のSC−SC線に沿う拡大要部断面図。The expanded principal part sectional view which follows the SC-SC line of FIG. 第3実施形態によるベースシート裏面の外観図。The external view of the base sheet back surface by 3rd Embodiment. 図5のSD−SD線に沿う拡大要部断面図。FIG. 6 is an enlarged main portion sectional view taken along the SD-SD line in FIG. 5. 第4実施形態によるベースシート裏面の外観図。The external view of the base sheet back surface by 4th Embodiment. 図7のSE−SE線に沿う拡大要部断面図。FIG. 8 is an enlarged cross-sectional view of an essential part taken along line SE-SE in FIG. 7. 一従来例による携帯電話機の外観斜視図。The external appearance perspective view of the mobile phone by a prior art example. 図9の携帯電話機に備えるキーシートの外観図。FIG. 10 is an external view of a key sheet provided in the mobile phone of FIG. 9. 図9の SA−SA線に沿う概略断面図。FIG. 10 is a schematic sectional view taken along the line SA-SA in FIG. 9. 携帯電話機の直立状態を示す図10相当の概略断面図。FIG. 11 is a schematic cross-sectional view corresponding to FIG. 10 showing an upright state of the mobile phone. 携帯電話機の傾倒状態を示す図10相当の概略断面図。FIG. 11 is a schematic cross-sectional view corresponding to FIG. 10 showing a tilted state of the mobile phone.

符号の説明Explanation of symbols

1 携帯電話機(機器)
2 筐体
2a 操作開口
4,4a,4b,4c キートップ
6 プリント基板(剛性部材)
6b 凹部
6c 突起
11 キーシート(第1実施形態)
12 ベースシート
12d 凹部
12e 浮動支持部
12f 支持部
12g 収容凹部
12h 突起(固定部)
12i 凹部(固定部)
14 キーシート(第2実施形態)
15 キーシート(第3実施形態)
16 ベースシート
17 フレーム(補強部材)
17a 桟部(支持部)
17b 突起(固定部)
18 浮動支持部
19 支持部
20 キーシート(第4実施形態)
21 ベースシート
22 フレーム(補強部材)
22a 桟部(支持部)
22b 突起(固定部)
22c 凹部(固定部)
23 浮動支持部
1 Mobile phone (equipment)
2 Housing 2a Operation opening 4, 4a, 4b, 4c Key top 6 Printed circuit board (rigid member)
6b Recessed part 6c Projection 11 Key sheet (first embodiment)
12 Base sheet 12d Concave part 12e Floating support part 12f Support part 12g Accommodating concave part 12h Protrusion (fixing part)
12i recess (fixed part)
14 Key sheet (second embodiment)
15 Key sheet (Third embodiment)
16 Base sheet 17 Frame (reinforcing member)
17a Crosspiece (support part)
17b Protrusion (fixing part)
18 floating support portion 19 support portion 20 key sheet (fourth embodiment)
21 Base sheet 22 Frame (reinforcing member)
22a Crosspiece (support part)
22b Protrusion (fixing part)
22c Concave part (fixed part)
23 Floating support

Claims (7)

ベースシートと、ベースシートに狭間配置されて機器の筐体に形成した仕切桟の無い操作開口から露出させる複数のキートップとを備えるキーシートにおいて、
ベースシートに、該キートップをそれぞれ固着するゴム状弾性体でなる複数の浮動支持部を押圧変位可能に支持する支持部を設け、該支持部の裏面に、前記筐体内で固定配置される剛性部材に固定する固定部を設けたことを特徴とするキーシート。
In a key sheet comprising a base sheet and a plurality of key tops that are disposed between the base sheet and formed in the housing of the device and exposed from an operation opening without a partition rail,
A base sheet is provided with a support part that supports a plurality of floating support parts made of rubber-like elastic bodies that respectively fix the key tops so as to be capable of being pressed and displaced, and is rigidly disposed on the back surface of the support part within the housing. A key sheet comprising a fixing portion for fixing to a member.
固定部が、剛性部材に設けた凹部に対し圧入により固着する突起であるか、又は剛性部材に設けた突起が圧入により固着する凹部か、の少なくとも何れかである請求項1記載のキーシート。   2. The key sheet according to claim 1, wherein the fixing portion is at least one of a protrusion fixed to the concave portion provided on the rigid member by press-fitting or a protrusion provided on the rigid member fixed to the concave portion by press-fitting. 支持部を浮動支持部と一体のゴム状弾性体にて形成し、該支持部の裏面に前記固定部を形成した請求項1又は請求項2記載のキーシート。   The key sheet according to claim 1 or 2, wherein the support portion is formed of a rubber-like elastic body integrated with the floating support portion, and the fixing portion is formed on the back surface of the support portion. 支持部を浮動支持部と一体のゴム状弾性体にて形成するとともに該支持部に硬質樹脂でなる補強部材を設け、該補強部材の裏面に前記固定部を形成した請求項1又は請求項2記載のキーシート。   The support part is formed of a rubber-like elastic body integrated with the floating support part, a reinforcing member made of hard resin is provided on the support part, and the fixing part is formed on the back surface of the reinforcing member. Key sheet as described. 支持部を硬質樹脂でなる補強部材として形成し、該補強部材の裏面に前記固定部を形成した請求項1又は請求項2記載のキーシート。   The key sheet according to claim 1, wherein the support portion is formed as a reinforcing member made of a hard resin, and the fixing portion is formed on the back surface of the reinforcing member. 機器の筐体に形成した仕切桟の無い操作開口から露出させる複数のキートップを狭間配置したキーシートを、該複数のキートップを狭間配置した領域内で、該キーシートの裏面と対向し該筐体内で固定配置される剛性部材に対し、固定したキーシートの固定構造。   A key sheet in which a plurality of key tops that are exposed from an operation opening without a partition rail formed in a housing of the device is arranged narrowly is opposed to the back surface of the key sheet in an area in which the plurality of key tops are arranged in a narrow space. A fixed structure of a key sheet fixed to a rigid member fixedly arranged in a housing. キーシート又は剛性部材の何れか一方に突起を設け、前記何れか他方に凹部を設け、突起と凹部の凹凸嵌合により、キーシートを剛性部材に固定した請求項6記載のキーシートの固定構造。   The key sheet fixing structure according to claim 6, wherein a protrusion is provided on one of the key sheet and the rigid member, a recess is provided on the other, and the key sheet is fixed to the rigid member by fitting the protrusions and the recesses to the concave and convex portions. .
JP2004114676A 2004-04-08 2004-04-08 Key sheet and key sheet fixing structure Expired - Fee Related JP4486395B2 (en)

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