JP4034892B2

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Info

Publication number: JP4034892B2
Application number: JP33866598A
Authority: JP
Inventors: 裕次郎上島; 史郎宇野
Original assignee: Roland Corp
Current assignee: Roland Corp
Priority date: 1998-11-30
Filing date: 1998-11-30
Publication date: 2008-01-16
Anticipated expiration: 2018-11-30
Also published as: JP2000163061A

Description

【０００１】
【発明の属する技術分野】
本発明は、鍵盤装置の鍵に関するものである。
【０００２】
【従来の技術】
通常、鍵盤装置の鍵は、演奏者により押鍵操作される天板部と、天板部の幅方向の両側端縁から下方に張り出した側壁部とにより、下方に開口した断面コ字状の凹溝が形成された合成樹脂製の鍵本体で構成されたものが多い。
【０００３】
ピアノの鍵の場合は、上記の凹溝の部分が鍵盤装置本体の中に入ってしまうので外観上の問題はないが、シンセサイザやオルガンの鍵の場合は、鍵盤装置の構造上、凹溝が目につきやすいため、製品の外観が損われるという問題がある。そこで、この凹溝の目につきやすい部分を合成樹脂製の蓋部材で覆った鍵が広く用いられている。
【０００４】
図５は、従来の鍵の構造を示す側面図（ａ）、底面図（ｂ）、およびＡ−Ａ断面図（ｃ）である。
【０００５】
図５（ａ）、図５（ｂ）、および図５（ｃ）に示すように、この鍵１００は、鍵本体１０１、蓋部材１０６、および錘１０７から構成されている。
【０００６】
鍵本体１０１は、演奏者に近い側（図５（ａ）、図５（ｂ）の左側）から奥側（図５（ａ）、図５（ｂ）の右側）に向かって長手方向に延びる天板部１０２と、天板部１０２の長手方向に交わる幅方向の両側端縁から下方に張り出した互いに対向する側壁部１０４，１０４とを有しており、これら天板部１０２と側壁部１０４，１０４により、天板部１０２の演奏者に近い側の端部に下方に開口した断面コ字状の凹溝１０５が形成されている。凹溝１０５には所定の質量を有する錘１０７が納められており、錘１０７が納められた凹溝１０５は蓋部材１０６により覆われている。錘１０７は接着剤（後述）により鍵本体１０１に接着されている。
【０００７】
図６は、図５に示した従来の鍵の製造方法の一例を示す工程図であり、図７は、図６に示した工程により製造された鍵の断面図である。
【０００８】
図６（ａ）に示すように、鍵本体１０１を裏返しの状態、すなわち凹溝１０５が上を向いた状態に保持し、凹溝１０５の底部に所定量の接着剤１０８を塗布する。
【０００９】
次に、図６（ｂ）に示すように、凹溝１０５の底部に塗布された接着剤１０８の上に所定の質量を有する錘１０７を載せる。すると、凹溝１０５底部の接着剤１０８は、毛細管現象により鍵本体１０１と錘１０７の隙間から錘１０７の上側に滲み出してくる。
【００１０】
図６（ｃ）に示すように、蓋部材１０６の鍵本体１０１と向き合う面には十字状の接着用突起１０６ａが形成されている。この蓋部材１０６を、図７に示すように、鍵本体の凹溝１０５の上に被せることにより、錘１０７の上に滲み出した接着剤と接着用突起１０６ａとが接着して、鍵本体１０１、錘１０７、および蓋部材１０６が接着される。このとき、接着剤の一部は毛細管現象により凹溝１０５の内壁面を伝って、鍵本体１０１の側壁部１０４の下縁部と蓋部材１０６の間隙１０９に滲み込んで凝固し、鍵本体１０１と蓋部材１０６とを接着させる。
【００１１】
【発明が解決しようとする課題】
以上のようにして蓋付きの鍵１００を製作することができるが、上記の工程における種々の要因により次に説明するような不具合を起こすことがある。
【００１２】
図７に示すように、鍵本体１０１の凹溝１０５を覆う蓋部材１０６を鍵本体１０１に被せることにより、錘１０７の上に滲み出した接着剤の一部が、毛細管現象により凹溝１０５の内壁面を伝って、鍵本体１０１の側壁部１０４と蓋部材１０６の間隙１０９に滲み込んで鍵本体１０１と蓋部材１０６とが接着されるが、接着剤の塗布量のばらつきや、気温、湿度、気圧などの条件により、毛細管現象による接着剤の滲み込みが一様に起こるとは限らない。従って、鍵本体側壁部１０４の下縁部と蓋部材１０６の間隙１０９に滲み込んだ接着剤の一部が図７の左側に示すように間隙１０９の外側に滲み出して凝固物１０９ａを形成することがあり、また、図７の右側に示すように、接着剤が間隙１０９を満たさずに隙間１０９ｂのままとなってしまうこともある。
【００１３】
このように、従来の鍵には、製造時に不良品を発生することがあり、外観の美しい安価な製品を得ることが難しいという問題がある。
【００１４】
そこで、上記のようなコントロールの難しい毛細管現象を利用することなく、側壁部１０４の下縁部の、蓋部材との接合面に接着剤を直接塗布して鍵本体１０１と蓋部材１０６とを接着することも考えられるが、側壁部１０４の下縁部の、蓋部材との接合面の一定位置に一定量の接着剤を正確に塗布することは極めて難しく、接着剤が多すぎて接合面から滲み出たり、接着剤が少なすぎて接着不良を起こしたりすることが多く、この方法もまた実行不可能に近い。
【００１５】
本発明は、上記の事情に鑑み、蓋部材が強固に固定されるとともに外観の美しい鍵を提供することを目的とする。
【００１６】
【課題を解決するための手段】
上記の目的を達成する本発明の鍵は、所定の長手方向に延びる天板部と、該天板部の長手方向に交わる幅方向の両側端縁から下方に張り出した互いに対向する側壁部とにより、該天板部の一方の端部に、下方に開口した断面コ字状の凹溝が形成された合成樹脂製の鍵本体、および、前記凹溝の少なくとも一部を覆う合成樹脂製の蓋部材よりなり、前記鍵本体と前記蓋部材とが互いに接合されてなる、鍵盤装置用の鍵において、前記鍵本体の側壁部下縁部の、前記蓋部材に接する面、および、前記蓋部材の、前記鍵本体の側壁部下縁部に接する面の双方あるいはいずれか一方に、溶着用突起が形成されてなり、前記鍵本体と前記蓋部材が、前記溶着用突起の溶着により互いに接合されてなることを特徴とする鍵であって、前記蓋部材が、該蓋部材の、前記凹溝に対向する側の面に、前記鍵本体との相対的位置決めを行う位置決め用突起が形成されたものであり、かつ、該位置決め用突起が、前記溶着用突起との間に所定の間隙を隔てて形成されたものであることを特徴とする。
【００１９】
また、上記蓋部材が、その蓋部材の、上記凹溝に対向する側の面とは反対側の面に、上記一方の端部から長手方向の奥に向かって面の高さが上記天板部側に低下する段差が形成され、かつ上記段差よりも上記一方の端部側の蓋部材の表面が、上記段差よりも奥側の表面よりも平滑に仕上げられたものであってもよい。
【００２０】
さらに、上記鍵本体が、上記凹溝に所定の質量を有する錘を収納してなるものであり、かつ、上記蓋部材が、上記凹溝に対向する側の面に上記錘を固定する錘固定用突起が形成されたものであってもよい。
【００２１】
【発明の実施の形態】
以下、本発明の実施形態について説明する。
【００２２】
図１は、本発明の鍵の第１の実施形態を示す側面図（ａ）および底面図（ｂ）である。
【００２３】
図１（ａ）および図１（ｂ）に示すように、この鍵１０は、鍵本体１１、蓋部材１６、および錘１７から構成されている。
【００２４】
鍵本体１１は、演奏者に近い側（図１（ａ）、図１（ｂ）の左側）から奥側（図１（ａ）、図１（ｂ）の右側）に向かって長手方向に延びる天板部１２と、天板部１２の長手方向に交わる幅方向の両側端縁から下方に張り出した互いに対向する側壁部１４，１４とを有しており、これら天板部１２と側壁部１４，１４により、天板部１２の一方の端部に、下方に開口した断面コ字状の凹溝１５が形成されている。凹溝１５内には所定の質量を有する錘１７が納められ、凹溝１５が蓋部材１６により覆われ鍵本体１１と蓋部材１６とが互いに接合されて鍵１０が構成される。なお、蓋部材１６は、凹溝１５全体を覆うものではなく、凹溝１５の一部を覆うものであってもよい。
【００２５】
この第１の実施形態では、蓋部材１６の、鍵本体１１の側壁部１４，１４下縁部に接する面１６ａに溶着用突起１９が形成されている。図６に示したように、鍵本体１１を裏返しとし、凹溝１５内に錘１７を納めた後、蓋部材１６を被せた状態で、鍵本体１１と蓋部材１６を高周波溶着装置で超音波を印加することにより溶着用突起１９が溶着して鍵本体１１と蓋部材１６が接合される。
【００２６】
この溶着用突起１９は、鍵本体１１の側壁部１４，１４下縁部の、蓋部材１６に接する面１４ａ、および、蓋部材１６の、鍵本体１１の側壁部１４，１４下縁部に接する面１６ａの双方に形成してもよく、あるいはいずれか一方に形成してもよい。しかし、上記の第１の実施形態のように、鍵本体１１の側には溶着用突起を形成せずに、蓋部材１６の側にのみ溶着用突起１９を形成する構成とした場合は、蓋部材用の金型を起こすだけで、従来から使用している鍵本体用の金型はそのまま流用することができ、金型のコストを節約することができるという利点があるので好ましい。
【００２７】
なお、本実施形態では、図１に示すように、鍵本体１１側に鍵前壁１１ａが設けられているが、この鍵前壁１１ａは蓋部材１６側に設けてもよい。その場合は、蓋部材１６側に設けられた鍵前壁と鍵本体１１の天板部１２の裏側との当接位置に溶着用突起を形成するようにする。この溶着用突起も、鍵本体１１側または蓋部材１６側のどちらに形成してもよく、あるいは鍵本体１１側と蓋部材１６側の双方に形成してもよい。
【００２８】
次に、本発明の第２の実施形態について説明する。
【００２９】
図２は、本発明の鍵の第２の実施形態を示す側面図（ａ）、底面図（ｂ）、およびＡ−Ａ断面図（ｃ）である。
【００３０】
図２（ａ）、図２（ｂ）、および図２（ｃ）に示すように、この鍵２０は、鍵本体２１、蓋部材２６、および錘２７から構成されており、図１に示した第１の実施形態の鍵１０とほぼ同様の構成であるが、この第２の実施形態では、鍵本体２１の側壁部２４の下縁部の、蓋部材２６に接する面２４ａに溶着用突起２９が形成されており、高周波溶着装置によりこの溶着用突起２９が溶けて鍵本体２１と蓋部材２６が接合される。
【００３１】
このように、第１および第２のいずれの実施形態によっても、鍵本体の側壁部の下縁部と蓋部材の外周の双方あるいはいずれか一方に形成された溶着用突起が一様に溶けた後、凝固することにより鍵本体と蓋部材が直接溶着して接合されるので外観上の不良はほとんど生じない。
【００３２】
次に、本発明の第３の実施形態について説明する。
【００３３】
図３は、第３の実施形態に用いられる蓋部材の上面図（ａ）、側面図（ｂ）、および底面図（ｃ）である。
【００３４】
図３（ａ）、図３（ｂ）、および図３（ｃ）に示すように、この蓋部材３６には、鍵本体の凹溝（図１参照）に対向する側の面３６ａに、溶着用突起３９とともに、鍵本体との相対的位置決めを行う位置決め用突起４０が形成されており、かつ、位置決め用突起４０が、溶着用突起３９との間に所定の間隙４１を隔てて形成されている。こうすることにより、蓋部材３６を鍵本体の凹溝に被せて溶着を行う際に、位置決め用突起４０と溶着用突起３９との間に所定の間隔４１が存在しているので、溶着時の熱で位置決め用突起４０の一部が溶けても蓋部材と鍵本体側壁部下縁部との間で溶ける樹脂の量を一様にすることができ、位置決め用突起４０の一部が外側に溶けて滲み出す心配がなくなり外観が損なわれることが防止される。
【００３５】
なお、この第３の実施形態では、図３（ｂ）および図３（ｃ）に示すように、溶着用突起として、複数の針状突起３９ａが列設されてなる溶着用突起３９が示されているが、溶着用突起はこのような形状や、図１、図２に示したような畝状の形状やその他どのような形状のものでもよい。
【００３６】
また、この蓋部材３６では、鍵本体の凹溝に対向する側の面３６ａとは反対側の面に、鍵本体の演奏者に近い側の端部から長手方向の奥に向かって、すなわち、図３（ａ）に示す、演奏者に近い側の蓋部材３６前部Ｆから演奏者に遠い側の蓋部材３６後部Ｒに向かって面の高さが天板部側に低下する段差３６ｄが形成されている。このように段差３６ｄを形成することにより蓋部材３６後部Ｒの面３６ｃは、蓋部材３６前部Ｆの面３６ｂの蔭に隠れて演奏者からは見えにくくなくなる。従って、段差３６ｄよりも奥側の面３６ｃを、演奏者に近い側の面３６ｂよりも、表面の平滑度を下げることができるので、面３６ｃに対応する金型の表面精度を、面３６ｂに対応する金型の表面精度よりも低く設定することが可能となり、製造コストを低減することができる。
【００３７】
次に、本発明の第４の実施形態について説明する。
【００３８】
図４は、第４の実施形態に用いられる蓋部材の底面図（ａ）およびそのＡ−Ａ断面図（ｂ）である。
【００３９】
図４（ａ）および図４（ｂ）に示すように、この蓋部材４６には、鍵本体の凹溝に対向する側の面４６ａに、鍵本体との相対的位置決めを行う位置決め用突起４０が形成されており、かつ、位置決め用突起４０の一部が、鍵本体の凹溝に収納された錘を固定する錘固定用突起４０ａを兼ねている。こうすることにより、蓋部材４６を鍵本体に溶着する際に、蓋部材４６と鍵本体、蓋部材４６と錘を同時に固着することができるので鍵本体に錘を接着する手間を省くことができる。
【００４０】
なお、第４の実施形態では、錘固定用突起４０ａの一部が錘を固定しているが、錘固定用突起４０ａは錘を抑えるのみであってもよく、その場合は、蓋部材４６と鍵本体の凹溝に対応する面４６ａは、錘固定用突起４０ａが錘を抑えた状態で溶着されるようになっている。
【００４１】
【発明の効果】
以上説明したように、本発明の鍵によれば、接着剤を用いることなく蓋部材を鍵本体に直接溶着することができるので、蓋部材が強固に固定されるとともに外観の美しい鍵を実現することができる。
【図面の簡単な説明】
【図１】本発明の鍵の第１の実施形態を示す側面図（ａ）および底面図（ｂ）である。
【図２】本発明の鍵の第２の実施形態を示す側面図（ａ）、底面図（ｂ）、およびＡ−Ａ断面図（ｃ）である。
【図３】第３の実施形態に用いられる蓋部材の上面図（ａ）、側面図（ｂ）、および底面図（ｃ）である。
【図４】第４の実施形態に用いられる蓋部材の底面図（ａ）およびそのＡ−Ａ断面図（ｂ）である。
【図５】従来の鍵の構造を示す側面図（ａ）、底面図（ｂ）、およびＡ−Ａ断面図（ｃ）である。
【図６】図５に示した従来の鍵の製造方法の一例を示す工程図である。
【図７】図６に示した工程により製造された鍵の断面図である。
【符号の説明】
１０鍵
１１鍵本体
１１ａ鍵前壁
１２天板部
１４側壁部
１４ａ面
１５凹溝
１６蓋部材
１６ａ面
１７錘
１９溶着用突起
２０鍵
２１鍵本体
２４側壁部
２４ａ面
２６蓋部材
２７錘
２９溶着用突起
３６蓋部材
３６ａ，３６ｂ，３６ｃ面
３６ｄ段差
３９溶着用突起
３９ａ針状突起
４０位置決め用突起
４０ａ錘固定用突起
４１間隙
４６蓋部材
４６ａ面
１００鍵
１０１鍵本体
１０２天板部
１０４側壁部
１０５凹溝
１０６蓋部材
１０６ａ接着用突起
１０７錘
１０８接着剤
１０９間隙
１０９ａ凝固物
１０９ｂ隙間[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a key of a keyboard device.
[0002]
[Prior art]
Normally, a key of a keyboard device has a U-shaped cross section that is opened downward by a top plate portion that is depressed by a performer and side wall portions that protrude downward from both side edges in the width direction of the top plate portion. Many of them are composed of a synthetic resin key body with a recessed groove.
[0003]
In the case of a piano key, there is no problem in appearance because the above-mentioned concave groove portion enters the keyboard device body. However, in the case of a synthesizer or organ key, the concave groove is due to the structure of the keyboard device. There is a problem that the appearance of the product is damaged because it is easily noticeable. In view of this, a key in which the conspicuous portion of the concave groove is covered with a synthetic resin lid member is widely used.
[0004]
FIG. 5 is a side view (a), a bottom view (b), and an AA sectional view (c) showing the structure of a conventional key.
[0005]
As shown in FIG. 5A, FIG. 5B, and FIG. 5C, the key 100 includes a key body 101, a lid member 106, and a weight 107.
[0006]
The key body 101 extends in the longitudinal direction from the side closer to the performer (the left side in FIGS. 5A and 5B) toward the back side (the right side in FIGS. 5A and 5B). The top plate portion 102 and side wall portions 104 and 104 facing each other and projecting downward from both side edges in the width direction intersecting with the longitudinal direction of the top plate portion 102 are provided. 104, a concave groove 105 having a U-shaped cross section that opens downward is formed at the end of the top panel 102 closer to the player. A weight 107 having a predetermined mass is accommodated in the concave groove 105, and the concave groove 105 in which the weight 107 is accommodated is covered with a lid member 106. The weight 107 is bonded to the key body 101 with an adhesive (described later).
[0007]
FIG. 6 is a process diagram showing an example of a method for manufacturing the conventional key shown in FIG. 5, and FIG. 7 is a cross-sectional view of the key manufactured by the process shown in FIG.
[0008]
As shown in FIG. 6A, the key body 101 is held in an inverted state, that is, the concave groove 105 faces upward, and a predetermined amount of adhesive 108 is applied to the bottom of the concave groove 105.
[0009]
Next, as shown in FIG. 6B, a weight 107 having a predetermined mass is placed on the adhesive 108 applied to the bottom of the concave groove 105. Then, the adhesive 108 at the bottom of the concave groove 105 oozes out from the gap between the key body 101 and the weight 107 to the upper side of the weight 107 by a capillary phenomenon.
[0010]
As shown in FIG. 6C, a cross-shaped bonding protrusion 106 a is formed on the surface of the lid member 106 that faces the key body 101. As shown in FIG. 7, the cover member 106 is placed on the concave groove 105 of the key body, whereby the adhesive that has oozed onto the weight 107 and the bonding protrusion 106a are bonded to each other. The weight 107 and the lid member 106 are bonded together. At this time, part of the adhesive travels along the inner wall surface of the concave groove 105 by capillary action, soaks into the gap 109 between the lower edge portion of the side wall portion 104 of the key body 101 and the lid member 106, and solidifies. And the lid member 106 are bonded.
[0011]
[Problems to be solved by the invention]
Although the key 100 with a lid can be manufactured as described above, the following problems may occur due to various factors in the above process.
[0012]
As shown in FIG. 7, by covering the key body 101 with a lid member 106 that covers the groove 105 of the key body 101, a part of the adhesive that has oozed out on the weight 107 is formed in the groove 105 by capillary action. The key body 101 and the lid member 106 adhere to the gap 109 between the side wall 104 of the key body 101 and the lid member 106 through the inner wall surface, and the key body 101 and the lid member 106 are bonded. Depending on conditions such as atmospheric pressure, the penetration of the adhesive due to capillary action does not always occur. Accordingly, a part of the adhesive that has oozed into the gap 109 between the lower edge of the key body side wall 104 and the lid member 106 oozes outside the gap 109 as shown on the left side of FIG. In addition, as shown on the right side of FIG. 7, the adhesive may not fill the gap 109 and may remain in the gap 109b.
[0013]
As described above, the conventional key has a problem that defective products may be produced during manufacturing, and it is difficult to obtain an inexpensive product with a beautiful appearance.
[0014]
Therefore, the key body 101 and the lid member 106 are bonded by directly applying an adhesive to the joint surface of the lower edge portion of the side wall 104 with the lid member without using the capillary phenomenon that is difficult to control as described above. However, it is extremely difficult to accurately apply a certain amount of adhesive at a certain position on the joint surface with the lid member at the lower edge of the side wall portion 104. It often oozes out or causes poor adhesion due to too little adhesive, and this method is also nearly infeasible.
[0015]
In view of the above circumstances, an object of the present invention is to provide a key having a beautiful appearance while the lid member is firmly fixed.
[0016]
[Means for Solving the Problems]
The key of the present invention that achieves the above object includes a top plate portion extending in a predetermined longitudinal direction, and opposing side wall portions projecting downward from both side edges in the width direction intersecting the longitudinal direction of the top plate portion. , A synthetic resin key body in which a concave groove having a U-shaped cross section opened downward is formed at one end of the top plate, and a synthetic resin lid covering at least a part of the concave groove A key for a keyboard device, wherein the key body and the lid member are joined to each other, a surface of the lower edge of the side wall of the key body that is in contact with the lid member, and the lid member, A welding projection is formed on both or one of the surfaces in contact with the lower edge of the side wall of the key body, and the key body and the lid member are joined to each other by welding the welding projection. A key characterized in that the lid member has the lid portion. A positioning projection for performing relative positioning with the key body is formed on the surface facing the concave groove, and the positioning projection is between the welding projection and the positioning projection. It is characterized by being formed with a predetermined gap.
[0019]
The lid member has a surface on the opposite side of the surface of the lid member facing the concave groove, and the height of the surface from the one end portion toward the back in the longitudinal direction is the top plate. A step that decreases toward the part may be formed, and the surface of the lid member on the one end side of the step may be smoother than the surface on the back side of the step.
[0020]
Further, the key body is formed by housing a weight having a predetermined mass in the concave groove, and the lid member fixes the weight on a surface facing the concave groove. A protrusion may be formed.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described.
[0022]
FIG. 1 is a side view (a) and a bottom view (b) showing a first embodiment of the key of the present invention.
[0023]
As shown in FIGS. 1A and 1B, the key 10 includes a key body 11, a lid member 16, and a weight 17.
[0024]
The key body 11 extends in the longitudinal direction from the side closer to the performer (left side in FIGS. 1A and 1B) toward the back side (right side in FIGS. 1A and 1B). The top plate portion 12 has side wall portions 14 and 14 facing each other and projecting downward from both side edges in the width direction intersecting with the longitudinal direction of the top plate portion 12, and the top plate portion 12 and the side wall portion 14. 14, a concave groove 15 having a U-shaped cross section opened downward is formed at one end of the top plate 12. A weight 17 having a predetermined mass is accommodated in the concave groove 15, the concave groove 15 is covered with a lid member 16, and the key body 11 and the lid member 16 are joined to each other to constitute the key 10. The lid member 16 may not cover the entire groove 15 but may cover a part of the groove 15.
[0025]
In the first embodiment, a welding projection 19 is formed on a surface 16 a of the lid member 16 that is in contact with the lower edge of the side walls 14, 14 of the key body 11. As shown in FIG. 6, after the key body 11 is turned upside down, the weight 17 is placed in the concave groove 15, and then the cover member 16 is covered, the key body 11 and the cover member 16 are ultrasonicated with a high frequency welding device. , The welding projection 19 is welded, and the key body 11 and the lid member 16 are joined.
[0026]
The welding protrusion 19 is in contact with the surface 14 a of the lower edge of the side wall 14, 14 of the key body 11 that is in contact with the lid member 16, and the lower edge of the side wall 14, 14 of the key body 11 of the lid member 16. It may be formed on both sides of the surface 16a, or may be formed on either one. However, as in the first embodiment, when the welding projection 19 is formed only on the lid member 16 side without forming the welding projection on the key body 11 side, the lid It is preferable that the key body mold that has been used conventionally can be used as it is simply by raising the mold for the member, and the cost of the mold can be saved.
[0027]
In the present embodiment, as shown in FIG. 1, the key front wall 11a is provided on the key body 11 side. However, the key front wall 11a may be provided on the lid member 16 side. In that case, a welding projection is formed at a contact position between the front wall of the key provided on the lid member 16 side and the back side of the top plate portion 12 of the key body 11. This welding protrusion may be formed on either the key body 11 side or the lid member 16 side, or may be formed on both the key body 11 side and the lid member 16 side.
[0028]
Next, a second embodiment of the present invention will be described.
[0029]
FIG. 2: is the side view (a) which shows 2nd Embodiment of the key of this invention, a bottom view (b), and AA sectional drawing (c).
[0030]
As shown in FIGS. 2 (a), 2 (b), and 2 (c), the key 20 is composed of a key body 21, a lid member 26, and a weight 27, as shown in FIG. Although the configuration is substantially the same as that of the key 10 of the first embodiment, in this second embodiment, the welding protrusion 29 is formed on the surface 24a of the lower edge portion of the side wall portion 24 of the key body 21 that contacts the lid member 26. The welding projection 29 is melted by the high frequency welding device, and the key body 21 and the lid member 26 are joined.
[0031]
As described above, in any of the first and second embodiments, the welding protrusion formed on the lower edge portion of the side wall portion of the key body and / or the outer periphery of the lid member was uniformly melted. Thereafter, the key body and the lid member are directly welded and joined by solidification, so that almost no appearance defects occur.
[0032]
Next, a third embodiment of the present invention will be described.
[0033]
FIG. 3 is a top view (a), a side view (b), and a bottom view (c) of a lid member used in the third embodiment.
[0034]
As shown in FIGS. 3 (a), 3 (b), and 3 (c), the lid member 36 is welded to a surface 36a on the side facing the concave groove (see FIG. 1) of the key body. A positioning projection 40 for relative positioning with the key body is formed together with the projection 39, and the positioning projection 40 is formed with a predetermined gap 41 between the positioning projection 40 and the welding projection 39. Yes. By doing so, there is a predetermined interval 41 between the positioning projection 40 and the welding projection 39 when the lid member 36 is put on the concave groove of the key body and welding is performed. Even if a part of the positioning projection 40 is melted by heat, the amount of the resin melted between the lid member and the lower edge of the side wall of the key body can be made uniform, and a part of the positioning projection 40 melts outside. The appearance is prevented from being damaged because there is no worry of bleeding.
[0035]
In the third embodiment, as shown in FIGS. 3B and 3C, a welding projection 39 in which a plurality of needle-like projections 39a are arranged is shown as the welding projection. However, the welding protrusion may have such a shape, a bowl-like shape as shown in FIGS. 1 and 2, or any other shape.
[0036]
Further, in this lid member 36, on the surface opposite to the surface 36a on the side facing the concave groove of the key body, from the end of the key body closer to the player toward the back in the longitudinal direction, that is, As shown in FIG. 3 (a), there is a step 36d in which the height of the surface decreases from the front part F on the side close to the performer to the rear part R on the side far from the performer toward the top plate part. Is formed. By forming the step 36d in this manner, the surface 36c of the rear portion R of the lid member 36 is hidden behind the surface 36b of the front portion F of the lid member 36 and is not easily visible to the player. Therefore, since the surface smoothness of the surface 36c on the back side of the step 36d can be lowered than the surface 36b on the side closer to the performer, the surface accuracy of the mold corresponding to the surface 36c can be increased to the surface 36b. It becomes possible to set lower than the surface accuracy of the corresponding mold, and the manufacturing cost can be reduced.
[0037]
Next, a fourth embodiment of the present invention will be described.
[0038]
FIG. 4 is a bottom view (a) of the lid member used in the fourth embodiment and an AA sectional view (b) thereof.
[0039]
As shown in FIGS. 4 (a) and 4 (b), the lid member 46 has a positioning projection 40 for relative positioning with the key body on a surface 46a on the side facing the concave groove of the key body. And a part of the positioning protrusion 40 also serves as a weight fixing protrusion 40a for fixing the weight housed in the concave groove of the key body. In this way, when the lid member 46 is welded to the key body, the lid member 46 and the key body, and the lid member 46 and the weight can be fixed at the same time, so that the trouble of adhering the weight to the key body can be saved. .
[0040]
In the fourth embodiment, a part of the weight fixing protrusion 40a fixes the weight, but the weight fixing protrusion 40a may only hold the weight. The surface 46a corresponding to the concave groove of the key body is welded in a state where the weight fixing projection 40a holds the weight.
[0041]
【The invention's effect】
As described above, according to the key of the present invention, since the lid member can be directly welded to the key body without using an adhesive, the lid member is firmly fixed and a key having a beautiful appearance is realized. be able to.
[Brief description of the drawings]
FIG. 1 is a side view (a) and a bottom view (b) showing a first embodiment of a key of the present invention.
FIG. 2 is a side view (a), a bottom view (b), and an AA cross-sectional view (c) showing a second embodiment of the key of the present invention.
FIG. 3 is a top view (a), a side view (b), and a bottom view (c) of a lid member used in the third embodiment.
4A is a bottom view of a lid member used in the fourth embodiment, and FIG.
FIG. 5 is a side view (a), a bottom view (b), and an AA sectional view (c) showing a structure of a conventional key.
6 is a process diagram showing an example of a method for manufacturing the conventional key shown in FIG. 5. FIG.
7 is a cross-sectional view of a key manufactured by the process shown in FIG. 6. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Key 11 Key main body 11a Key front wall 12 Top plate part 14 Side wall part 14a Surface 15 Concave groove 16 Lid member 16a Surface 17 Weight 19 Welding protrusion 20 Key 21 Key main body 24 Side wall part 24a Surface 26 Lid member 27 Weight 29 Welding Projection 36 Lid member 36a, 36b, 36c Surface 36d Step 39 Welding projection 39a Needle-like projection 40 Positioning projection 40a Weight fixing projection 41 Gap 46 Lid member 46a Surface 100 Key 101 Key body 102 Top plate portion 104 Side wall portion 105 Concave Groove 106 Lid member 106a Adhesive protrusion 107 Weight 108 Adhesive 109 Gap 109a Coagulated material 109b Gap

Claims

By a top plate portion extending in a predetermined longitudinal direction and opposite side wall portions projecting downward from both side edges in the width direction intersecting the longitudinal direction of the top plate portion, on one end portion of the top plate portion, A key body made of a synthetic resin formed with a concave groove having a U-shaped cross section opened downward, and a lid member made of a synthetic resin covering at least a part of the groove, the key body and the lid member; In a key for a keyboard device, which are joined together,
A welding protrusion is formed on either or either of the surface of the lower edge of the side wall of the key body that contacts the lid member and the surface of the lid member that contacts the lower edge of the side wall of the key body. The key body and the lid member are joined to each other by welding of the welding protrusions,
The lid member is formed with a positioning projection for performing relative positioning with the key body on the surface of the lid member facing the concave groove, and the positioning projection is A key characterized in that it is formed with a predetermined gap between it and the welding projection.

By a top plate portion extending in a predetermined longitudinal direction and opposite side wall portions projecting downward from both side edges in the width direction intersecting the longitudinal direction of the top plate portion, on one end portion of the top plate portion, A key body made of a synthetic resin formed with a concave groove having a U-shaped cross section opened downward, and a lid member made of a synthetic resin covering at least a part of the groove, the key body and the lid member; In a key for a keyboard device, which are joined together,
A welding protrusion is formed on either or either of the surface of the lower edge of the side wall of the key body that contacts the lid member and the surface of the lid member that contacts the lower edge of the side wall of the key body. The key body and the lid member are joined to each other by welding of the welding protrusions,
The lid member has a surface on the opposite side of the surface of the lid member that faces the concave groove, and the height of the surface from the one end toward the back in the longitudinal direction is on the top plate side. And the surface of the lid member on the one end side with respect to the step is smoother than the surface on the back side with respect to the step. key.

By a top plate portion extending in a predetermined longitudinal direction and opposite side wall portions projecting downward from both side edges in the width direction intersecting the longitudinal direction of the top plate portion, on one end portion of the top plate portion, A key body made of a synthetic resin formed with a concave groove having a U-shaped cross section opened downward, and a lid member made of a synthetic resin covering at least a part of the groove, the key body and the lid member; In a key for a keyboard device, which are joined together,
A welding protrusion is formed on either or either of the surface of the lower edge of the side wall of the key body that contacts the lid member and the surface of the lid member that contacts the lower edge of the side wall of the key body. The key body and the lid member are joined to each other by welding of the welding protrusions,
The key body is formed by housing a weight having a predetermined mass in the concave groove, and the weight fixing protrusion for fixing the weight to the surface on the side facing the concave groove. A key characterized in that is formed.