JP3706953B2 - Keyboard device - Google Patents

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Publication number
JP3706953B2
JP3706953B2 JP17596796A JP17596796A JP3706953B2 JP 3706953 B2 JP3706953 B2 JP 3706953B2 JP 17596796 A JP17596796 A JP 17596796A JP 17596796 A JP17596796 A JP 17596796A JP 3706953 B2 JP3706953 B2 JP 3706953B2
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key
mass body
rotation
elastic piece
support member
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JPH09330084A (en
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順一 三島
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Yamaha Corp
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Yamaha Corp
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/32—Constructional details
    • G10H1/34—Switch arrangements, e.g. keyboards or mechanical switches specially adapted for electrophonic musical instruments
    • G10H1/344—Structural association with individual keys
    • G10H1/346—Keys with an arrangement for simulating the feeling of a piano key, e.g. using counterweights, springs, cams

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Electrophonic Musical Instruments (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば電子楽器の鍵盤装置に係り、これに用いられるバネ材を簡素化し、鍵等の回動部材の支持部材への組み込みまたは分解作業を容易にできるようにした鍵盤装置に関する。
【０００２】
【従来の技術】
一般に、電子楽器の鍵盤装置は、実公平２ー１６３９３または特開昭６３ー１２５９９１に見られるように、鍵を支持部材から離間方向に付勢する鍵復帰バネを有するもので、なおかつ、このバネは激しい鍵動作及びどのような鍵操作にも支持部材から離脱しないようにするため、該バネとは別部材にて鍵脱落防止部材を有している。
【０００３】
【発明の解決しようとする課題】
しかしながら、上記従来技術においては、鍵と支持部材との間に介在される該バネの設置作業が煩雑にならざるを得なかった。例えば上記前者従来技術において、該バネ設置作業は、特公昭６４ー１００７７の技術により鍵裏面を上にして該バネを鍵に仮係止し、そのバネ付き鍵を支持部材に装着する。また、上記後者従来技術では、支持部材に鍵を仮係止した状態で、支持部材をターンして該バネを挿入し、該作業が終わると支持部材を表返す。このような作業の中で、鍵または支持部材をターンして鍵または／及びバネを装着する作業が一番繁雑な作業であり、自動化するとしても大型ロボットを必要とし、コスト大となり、従って鍵等の支持部材への組み込み作業を手作業で行っていた。
【０００４】
このような背景から、鍵動作の基本機能を維持しつつ鍵その他の支持部材への挿着を容易にすることが望まれていた。
そこで、本発明では、鍵または質量体等の回動部材の支持部材への挿着を容易にするようにしつつ、挿着後においては、該回動部材の基本機能（回動部材の支持部材への付勢または回動部材の支持部材に対する脱落防止）を保持するようにしたことを目的とする。
【０００５】
【課題を解決するための手段】
上記目的を達成するために本発明請求項１記載の鍵盤装置は、回動部材（１、１００、３００）と、この回動部材の回動支点部（１２、１１２、３１１）を回動支持部（２２、２２２、２３２）にて回動自在に支持する支持部材（２、２００、２３０）とを有する鍵盤装置において、前記回動部材（１、１００、３００）の取り付け時、前記回動支点部（１２、１１２、３１１）に先んじて前記回動支持部と当接する被ガイド面（１１ｓ、３３１）と、前記回動部材（１、１００、３００）の取り付け時、前記支持部材に当接し、前記被ガイド面（１１ｓ、３３１）を前記回動支持部（１２、１１２、３１１）に押し当てる弾性片（１３、４３、１３ａ、３３７）とが、前記回動部材と一体に形成され、前記弾性片（１３、４３、１３ａ、３３７）は、前記回動部材の回動支点部（１２、１１２、３１１）が前記支持部材の回動支持部（２２、２２２、２３２）に回動自在に支持された状態において、弾性により、前記回動部材の回動支点部（１２、１１２、３１１）を前記支持部材の回動支持部（２２、２２２、２３２）に常に押し付けるよう当接させる。
【０００６】
本発明請求項１記載の鍵盤装置によれば、支持部材への回動部材挿着時及び挿着後の回動部材回動時において、回動部材に一体的に設けた該弾性片にて、回動部材を支持部材側の回動支持部に押し付けるように作用させる。これにより、回動部材挿着時にあっては、回動部材（後方）を弾性片に抗して該回動支持部に押し付け嵌挿させると、回動部材の支点部が自動的に回動支持部に嵌着し、嵌着した状態では非押鍵時及び押鍵時を通して該弾性片が該回動支持部を押圧する。従って非押鍵時、押鍵時には回動部材が支点（回動支持部）から離れないように付勢力を発生する。
該弾性片は、回動部材挿着時に言わば挿着案内片のようにも作用するので、回動部材の支持部材に対する挿着を容易にし、挿着後は、回動支点部を常に押圧することで回動部材の回動時に適度な摩擦感を与えることができ、タッチ感触を良好にしている。なおかつ、該弾性片の回動支点部に対する作用のさせ方によっては、鍵復帰力を発生させることもできる。
【０００７】
上記同一目的を達成するために本発明請求項２記載の鍵盤装置は、押鍵操作により回動される鍵（１、１Ｗ、１Ｂ、１００）と、この鍵の回動支点部（１２、１１２）を回動支持部（２２、２２２）にて回動自在に支持する支持部材（２、２００）とを有する鍵盤装置において、前記鍵（１、１Ｗ、１Ｂ、１００）と一体に形成された弾性片であり、前記鍵の後壁との間の許容空間（ｎｎ）を狭め又は広げる方向に弾性変形可能であり、前記鍵の取り付け時および前記鍵の回動支点部が回動支持部にて回動自在に支持された状態において、前記支持部材に当接して前記鍵の回動支点部を前記回動支持部に常に押し付ける第１弾性片（１３、４３、１１３）と、前記鍵と一体に形成された弾性片であって、前記第１弾性片と前記鍵の後壁との間の許容空間（ｎｎ）に対して挿抜可能な突起（１４ｐ、１４ｐｐ）を有し、前記鍵の取り付け時、前記支持部材に当接して弾性変形して前記突起を前記弾性片と前記鍵の後壁との間の許容空間から抜き、前記鍵の取り付け後、前記突起を前記弾性片と前記鍵の後壁との間の許容空間に挿入する第２弾性片（１４、１１４（ｐ））とを設けた。
【０００８】
本発明請求項２記載の鍵盤装置によれば、支持部材への鍵挿入時及び鍵挿着後において、鍵に一体的に設けた第１弾性片にて、鍵を支持部材側の回動支持部に押し付けるように作用させる。この場合、鍵挿入時と鍵挿着後回動時とでは、前記第１弾性片の動きを制限しなかったり、したりする。鍵挿着後回動時にあっては、仮に回動動作以外の変位（例えば鍵を前後方向に引／押）を与えても鍵が変位しないように、第２弾性片（実施例では鍵側に設けられる）を鍵の回動支点部と支持部材の回動支持部とで形成される許容空間に常に割り込ませるようにし、支持部材への鍵挿入時においては、該鍵挿入動作に連動して前記許容空間への割り込みを解除するように第２弾性片を弾性変位させる。
保守点検のため挿着後の鍵を支持部材から離脱する場合は、実施例においてはマイナスドライバのような治具を第１弾性片と第２弾性片との向き合う各側面間に挿入しつつ、鍵を支持部材から離間する方向（上方向）に引き離すようにすれば、離脱できるようになっている。上記表現を借りれば、鍵離脱時に前記許容空間への第２弾性片の割り込みが解除される手助けをマイナスドライバにて行えばよいもので、この手助けをしない限り鍵の破壊を除いて、鍵は如何なる場合も支持部材から離脱しない。
【０００９】
上記同一目的を達成するために、本発明請求項３記載の鍵盤装置は、鍵（１００）の回動に連動して揺動する質量体（３００）と、前記質量体の回動支点部（３１１）を質量体回動支持部（２３２）にて回動自在に支持する支持部材（２００）とを有する鍵盤装置において、前記支持部材と一体に設けられ、前記質量体回動支持部と対向する弾性片（２１１、２１１ａ、３３７）を有し、前記質量体の前記支持部材への取り付け時、前記質量体は前記弾性片と前記質量体支持部との間隙を通過し、前記質量体の回動支点部が質量体回動支持部にて回動自在に支持された状態において、当該弾性片の弾性により、前記質量体の回動支点部を前記回動支持部に常に押し付けるよう当接させる。
【００１０】
本発明請求項３記載の鍵盤装置によれば、支持部材への質量体挿入時及び質量体挿着後において、支持部材に一体的に設けた弾性片にて、質量体を支持部材側の回動支持部に押し付けるように作用させる。これにより、質量体挿入時にあっては、質量体を弾性片に抗して該回動支持部に押し付け嵌挿させると、質量体の支点部が自動的に回動支持部に嵌着し、嵌着した状態では非押鍵時及び押鍵時を通して該弾性片が該回動支持部を押圧する。従って回動支持部への質量体挿着後には、質量体が支点（回動支持部）から離れないように付勢力を発生する。該弾性片は、質量体挿入時に言わば挿着案内片のように作用するので、質量体の支持部材に対する挿着を容易にし、挿着後は、回動支点部を常に押圧することで押鍵時に適度な摩擦感を与えることができ、タッチ感触を良好にしている。
【００１１】
一般に質量体を備えた鍵盤装置では、鍵及び／または質量体の基本位置への復帰手段として、質量体そのものの自重を利用することが考えられている。本発明請求項３記載の鍵盤装置もこの範疇に入る鍵盤構造が可能であり、このような鍵盤装置を前提とした本発明請求項３記載の鍵盤装置にあっては、鍵及び質量体の支点構造は、回動部材の固定部側（回動支持部）への圧接作用及び／または回動部材脱落防止作用があれば鍵盤構造として成り立つ。つまり、質量体以外の回動部材復帰手段を不要にすることができる。それ故回動支点部を常に押圧する弾性片は基本的に強いものでなくてよい。付加価値として鍵タッチの摩擦感を発生させるにはやや強力にする必要があるだけである。従って本発明請求項３記載の鍵盤装置は、鍵盤装置を設計するに当たって大きな自由度を与えるもので、特開昭６３ー１２５９９１に用いられている鉄板等の耐久性を有する金属フレームを使用しなくてよくなり、例えば図７の第３実施例に示したように、加工が容易な樹脂フレームでよいようになる。このことから本発明請求項３記載の鍵盤装置は、部材組み込みのローコスト化に加えて更なる鍵盤装置のローコスト化に寄与する可能性がある。
【００１２】
上記同一目的を達成するために、本発明請求項４記載の鍵盤装置は、請求項１の特徴と請求項３の特徴を併有する。
【００１３】
本発明請求項４記載の鍵盤装置によれば、支持部材への鍵及び質量体挿入時及び挿着後において、支持部材または回動部材に一体的に設けた弾性片にて、鍵及び質量体を支持部材側の回動支持部に押し付けるように作用させている。これにより、鍵及び質量体の両回動部材挿入時にあっては、両回動部材を弾性片に抗して対向する各回動支持部に押し付け嵌挿させると、両回動部材の支点部が自動的に上記各回動支持部に嵌着し、嵌着した状態では非押鍵時及び押鍵時を通して該各弾性片によって両回動部材を支点（回動支持部）から離れないように付勢力を発生する。
即ち、本発明請求項３記載の鍵盤装置と同様の作用をしつつ、その効果も付帯している。そして、請求項３記載発明の主な作用効果は、質量体付鍵盤装置において、特開昭６３ー１２５９９に見られる鍵及び／または質量体における部材挿着時点で別構成の復帰用板バネを不要にすることができた点にある。
【００１４】
【発明の実施の形態】
図１〜図４は、回動部材を鍵として構成した場合の本発明請求項１〜２記載の実施態様（第１実施例）を表すものである。さらに詳しくは、図１は、第１実施例における鍵盤装置の全体を一部側断面図として示したものであり、図２は、鍵後部を後上方から見た部分的斜視図であり、図３は、鍵支点近傍の詳細図であって、（ａ）がその背面から見た背面図、（ｂ）が鍵及び支持部材を上方から見た平面図（ａ図のｂ−ｂ矢視図）、（ｃ）が支持部材を後方から見た立面図（ｂ図のｃ−ｃ矢視図）、（ｄ）が（ａ）図におけるｄ−ｄ断面の矢視図、（ｅ）が（ａ）図におけるｅ−ｅ断面の矢視図、（ｆ）が（ａ）図におけるｆ−ｆ断面の矢視図である。
【００１５】
図１は、鍵１が支持部材２に鍵後部１０を介して今まさに嵌合しようとしている図であって、鍵のストッパ片１ｓを支持部材の透孔２ｈに嵌合しつつ、ガイド片２ｇに鍵１を案内させながら鍵後端下部１１を支点部透孔２１に挿入することで、鍵１の支持部材２への組み込みが行われる。鍵後部には、鍵組み込み時の後述するガイド機構を有しており、このガイド機構によって鍵はスムーズに支持部材に挿着され、その回動支点部１２が回動支持部２２に嵌合する。そして鍵挿着時の鍵操作時において鍵復帰機能は、この発明の主要部をなす鍵後端固着の第１弾性片１３に持たせてもよいし、ここの弾性を弱くしておいて、押鍵時にアクチュエータ１ａにて駆動される鍵スイッチであって、お椀状可動接点を構成するゴム状の弾性体２３にて持たせるようにしてもよく、該第１弾性片１３及び弾性体２３の両方にその機能を受け持たせてもよい。
【００１６】
図２は、鍵後部１０の詳細を示しており、図３も参照しながらその詳細を説明する。該鍵後部１０には、支点機能と、鍵１０の支持部材２への挿着時のガイド機能と、鍵１０の支持部材２への圧接機能と、鍵復帰機能と、鍵脱落防止機能とが備わっており、まず支点機能を有する構成から説明する。
支持部材２の後方に設けられた支点部透孔２１の前端縁に支持部材２に一体に樹脂で形成した円弧状の回動支持部２２を具備し、該回動支持部２２に嵌合し得るように、凹部状回動支点１２が鍵の両側壁１ｗ１，１ｗ２間を繋ぐリブ壁１２ｒに設けられ、該回動支持部２２と該回動支点部１２とで、鍵が回動する支点部を構成している。
【００１７】
次に、あとの４つの機能であるが、複雑に絡み合って各部品または複数部品が共動して該４つの機能を果たしているので、それらをまとめて説明する。
鍵後端の背面である鍵後壁１０ｒは、補強を兼ねた前記リブ壁１２ｒから所定距離（例えば４ｍｍ）以上（実施例では８ｍｍ）隔てて設けられ、この鍵後壁１０ｒには３条の切れ溝ｄ１，ｄ２，ｄ３形成することで、第１弾性片１３と第２弾性片１４とからなる２つの弾性片を形成する。上記所定距離を隔てて後壁１０ｒを形成する理由は、鍵の支持部材への挿着時に第１弾性片１３が鍵前方に変位するためと、第２弾性片の基部が、弾性に対し耐久性を持つように鍵長手方向に幅を持たせたいからである。
【００１８】
第１弾性片１３は、図３（ｄ）に示すように後壁１０ｒの厚みより少し薄く形成することにより弾性を持たせており、鍵の支持部材への非挿着時においては、図３（ｅ）、図４（ａ）に示すように全体として鍵後端からさらに突出するように金型成型時に形成され、側面から見てく字状をなしている。
【００１９】
第２弾性片１４は、該弾性片１３に並設され、その基部１４ｆは、所定薄幅を有しつつ、図３（ｅ），（ｆ）に示すごとく鍵長手方向に対し後壁１０ｒ厚みより大の所定奥行き（図中左右方向距離）を有する。中央から先端部分は、上面に斜面１４ｓを有する変則五角形状の横変位可能部１４ｖが、該斜面１４ｓの分だけ厚みを増して三角状幅広部１４ｔを介して基部１４ｆに連設され、この部位１４ｖそれ自身は変形せず、基部１４ｆが、鍵挿入時に変位する。該三角状幅広部１４ｔの弾性片１３側方には、鍵の支持部材への非挿着時及び挿着後において該弾性片１３のく字状凹部１３ｃに嵌入する突起１４ｐが一体に設けられている。横変位可能部１４ｖの五角形の下２辺１４１、１４２で楔を形成し、辺１４２が鍵挿着時に支持部材２から突設した突部状ガイド片２４の斜面２４１にガイドされることで、第２弾性片１４は鍵の外方に変形し、突起１４ｐが凹部１３ｃから離脱して第１弾性片１３の鍵先端方向への変形を可能にしている。即ち、本発明請求項２記載の許容空間とは凹部１３ｃと鍵後壁１０ｒとで形成される空間を指している。
【００２０】
このことを鍵の支持部材への挿入状態遷移図で示した図４も参照して、さらに詳述する。図４（ａ）は、ストッパ片１ｓを透孔２ｈに嵌合（図１参照）しつつ鍵後方を透孔２１に翳した状態を示すものであって、断面図としてみた場合、図３（ｄ）と同じ断面を表している。従って断面表示（斜線）を省略する。鍵の前後方向のガイドは、支持部材２の後壁立ち上がり部２５の前面に第１弾性片１３の頂部１３ｔがガイドされるか、もしくは、回動支持部２２に鍵後端下部１１の非ガイド斜面１１ｓが当接してガイドされ始める。
【００２１】
ガイドされ始めにおいて、該斜面１１ｓが回動支持部２２に当接時、該斜面１１ｓと第１弾性片１３の自由端１３１との距離Ｄ１が支点部透孔２１の鍵長手方向距離Ｄ２よりわずかに小さく設定（Ｄ１＜Ｄ２）されているので、容易に鍵後端下部１１が透孔２１にはまり込む。鍵が第１弾性片１３にて回動支持部２２に押し付けられる圧接力を大きく設定する関係上、上記距離Ｄ１が上記距離Ｄ２より大きく設定（Ｄ１＞Ｄ２）される場合であっても、立ち上がり部２５に鍵を押し付けながら支持部材２への鍵挿入を行えばよく、そうでなくＤ１＜Ｄ２であっても、立ち上がり部２５を鍵挿入の最初のガイド部にした方が鍵挿入の作業がし易いので、鍵１を立ち上がり部２５に少し押し付けながら少し下方に移動させると図４（ｂ）の状態になる。
【００２２】
即ち、図４（ａ）から図４（ｂ）に遷移する際、鍵後部下部のうち一番早く支持部材２に当接するのは、鍵後端下部１１の下面１１ｕであり、その直後に辺１４２が斜面２４１に当接する。従って、鍵後端下部１１の下方側面と透孔２１の側縁部とで、鍵幅方向の規制を受けながら、第２弾性片１４が外方に変形して行き、弾性片１４が凹部１３ｃから離脱したところで弾性片１３の自由端１３１及び下片１３２が、透孔２１の後縁切欠部２１ｒに後付けもしくは成型時一体に形成されたすべり部２１ｓを滑りながら、鍵先端方向に変形させられて行く（図４（ｂ）〜図４（ｃ）参照）。
【００２３】
図４（ｃ）の状態は、回動支点部１２が回動支持部２２に今まさに嵌合しようとしている状態を示したもので、斜面１１ｓの終端１１ｅが支持部材２の水平面より下方に下がると、第１弾性片の上片１３３の弾性作用及び／又は外的な鍵下方移動力にて、図３（ｄ）の状態に即座に遷移する。図４（ｃ）から図３（ｄ）に遷移するとき、鍵１は支持部材２に対し前方に移動するので、第２弾性片の辺１４２は、斜面２４１との当接状態をＦ方向に解除される。これによって突起１４ｐが凹部１３ｃに再び瞬時的に介入する。
一度図３（ｄ）の状態になると、突起１４ｐにて第１弾性片の弾性変位がロックされるので鍵を前後に押し引きしながら持ち上げても支持部材から離脱することはない。
【００２４】
保守点検時に鍵を支持部材２から離脱する場合は、鍵後壁１０ｒと立ち上がり部２５との間であって第１弾性片１３の側面１３４と斜面１４ｓとの間にマイナスドライバなどの治具を挿入しつつ、鍵後方を持ち上げるようにすればよい。該治具の挿入によって第２弾性片１４は外方に変形させられるので、突起１４ｐは凹部１３ｃから離脱し、第１弾性片１３が弾性変位可能になるからである。
鍵挿入時及び鍵離脱時において、第２弾性片が鍵の外方に変形するが、突起１４ｐの凹部１３ｃへの介入解除に際して、横変位可能部１４ｖが変位するのに十分なクリアランスを確保するために、隣鍵との絡みもあって、楔を形成する辺１４１は鍵内側方向に切り欠いて斜辺を形成している。
【００２５】
ここで、前述の残り４つの機能がどの部品で果たしているかを説明しておく。鍵の支持部材への挿入時のガイド機能は、主に鍵後端下部１１とその透孔２１とで果たしている。特に斜面１１ｓと回動支点部２２でなされており、広義的に言うと第１弾性片１３と立ち上がり部２５との当接及び第１弾性片１３と係合部である後縁切欠部２１ｒとすべり部２１ｓによっても、鍵挿入ガイド機能を補助していると言える。
【００２６】
鍵の支持部材への圧接機能は、鍵挿入時において、主に下片１３２とすべり部２１ｓが果たしており、鍵挿入後鍵操作時においては、上片１３３とすべり部２１ｓが果たしている。そして、これら機能部材（上片１３３とすべり部２１ｓ）は、鍵挿入後の鍵脱落防止機能を補助している。
【００２７】
鍵復帰機能は、上片１３３とすべり部２１ｓとの当接によってベクトルａ１を発生し、鍵回動中心ｏを通る線分ａ１の法線との交点ｐと該中心ｏとからなる線分ｏｐをモーメントの腕長とし、該線分ｏｐにベクトルａ１を乗じたベクトルＴとして表される鍵復帰力を有する機能であり、あえてその部品を示すなら第１弾性片１３とこれに対接する関連部品で果たしている。またこの実施例では、鍵スイッチのゴム状弾性片２３がその機能を補助している。弾性片１３と弾性体２３とでどちらが主か従かについては設計事項であり、このいずれか一方を極めて零に近づけることも可能である。場合によっては第１弾性片１３による変形例にてこの弾性片の鍵復帰力を負にすることもできる。
【００２８】
鍵脱落防止機能は、第２弾性片１４が果たしており、より詳しくは、支持部材２に対して鍵挿脱時を除く鍵挿着後において、第１弾性片１３が鍵前方に移動し得る許容空間（凹部１３ｃで形成された空間ｎｎ）に突起１４ｐを割り込ませるようにした構成によって果たしている。
【００２９】
次に鍵復帰機能を実現する他の実施例について述べる。その前に前記実施例における鍵盤装置の長所、短所を整理することにより、製品化する場合の各種最適実施例を考察する。
まず、前記実施例では多機能部材である第１弾性片を鍵に樹脂で一体成形し、なおかつ、鍵の支持部材へのワンタッチ装着を可能にしたことにより、従来に見られた別体の鍵復帰バネをなくし、構成及び組立作業性の点で大幅なコストダウンを図ることができた。しかしながら、鍵盤装置の鍵というものは、何十万回もの押離鍵に耐え得るものでなければならない。この観点から前実施例を考えた場合、第１弾性片のバネ性を強く設定すると、経年変化もしくは長い間の弾性回復力の低下が、樹脂であるが故に心配される。従って、前実施例では、その長所を生かして第１弾性片のバネ性を余り強く設定せず、お椀状ゴムスイッチによる鍵復帰力を借りた図１のような鍵盤装置が最適のように思われる。あるいは、やはり第１弾性片のバネ性を余り強く設定しないようにして、質量体の自重による鍵復帰力を借りた例えば後述の第３実施例（図７及び図８）なら、前実施例で想定される短所も表れて来ない。
【００３０】
上記お椀状ゴムスイッチ使用の従来鍵盤装置は、例えば特公平６ー３１９３９に見られるようにローコストを追求しているので、鍵はその基端部で共通に連結された構成をとっている。
これにより、鍵の支持部材への組み込みが、容易な反面、極部的な故障であっても保守点検時において、多数鍵を同時に支持部材から外さなければならない不便さがある。さらに保守後においては、鍵並びが、微妙にずれてしまい、鍵操作性が悪くなることがあった。
これに対し、前実施例では、保守時においても、その保守部に対応した鍵のみの脱着でよいため、一見、特公平６ー３１９３９に対して劣性のように思われるが、実はこの実施例の方が優性でもある。
【００３１】
さらに、ＵＳＰ４６０２５４９のような中級モデルに対する本発明の優位性について、更なる最適実施例を考えてみる。ＵＳＰ４６０２５４９のような錘を鍵に有する鍵盤装置では、鍵復帰力を十分にかつ耐久性及び恒久性を持って、発生させなければならない。そこで、この点をクリアした実施例（第２実施例）を図５及び図６に示して説明する。
【００３２】
第２実施例の特徴は、弾性回復力が長期に渡って低下しにくい金属板バネを前記第１弾性片３３（４３）として採用し、なおかつ、鍵復帰力を大きく設定できるように回転モーメントの腕長を大きくしている。
図５は、鍵後部１０を側面図とし、その他を側断面図とした非押鍵時の鍵盤装置全体を表し、図６は、鍵後部１０を側断面図として表した押鍵時の図である。図５及び図６において、前実施例と同一またはほぼ同一部分については同一番号を付している。
【００３３】
鍵盤装置の全体構成としては、鍵押下時の慣性質量を大きくし、弾きごたえ感を有するように白鍵１Ｗ、黒鍵１Ｂの自由端下面に白鍵用錘１Ｗｗ、黒鍵用錘１Ｂｗを付着した構成とし、鍵後壁１０ｒに金属板バネ（４３）を設けている。そして前実施例使用のお椀状ゴムスイッチによる鍵復帰補助力を借りなくてもよい光利用キーセンサを採用している。支持部材２には、鍵自由端下方に設けたストッパ片１Ｗｓ、１Ｂｓが、非押鍵時に当接する上限ストッパ２ｓｕと、押鍵時に鍵下面が当接する下限ストッパ２ｓｄとが設けられている。
なお、凹部２ｈ１は、白鍵用錘１Ｗｗの逃げ孔であり、透孔２ｈ２は、黒鍵用錘１Ｂｗの逃げ孔である。また、錘１Ｗｗは、鍵両サイドの側壁１ｗ１，１ｗ２と前後壁を形成するリブ壁１ｒ１，１ｒ２とにて構成した箱部に、接着剤等にて固着される。黒鍵も同様に構成されるが、重量、形状を異にしている。
【００３４】
押鍵検出機構は、赤外線発光ダイオードからなる発光部と、透孔ｋｓｈで構成される所定間隔を隔てて対向部に形成されるフォトトランジスタからなる受光部とを対構成にし、複数鍵分を一体成形して得られるキーセンサユニットｋｓｕで形成され、該透孔ｋｓｈに重ねて支持部材２に設けられた透孔２ｈ２にも押鍵時貫通する鍵アクチュエータ用シャッタ板の挿脱によって押離鍵を検出するようになっている。１鍵に対し発受光部を２つ設け、シャッタ板下端または発受光部を段違いに形成することにより時間差センスによってタッチレスポンススイッチが形成できる。また、シャッタ板をグレイスケールで構成することによって押鍵ストロークの全行程センシングも可能である。
【００３５】
図６において、第１弾性片３３は、上片ａと下片ｂとの境目で折曲した金属（鋼）板バネからなり、金型での鍵製造時に、金型内に予め該バネを所定位置に載置して、その状態で樹脂を流し込むことにより、鍵後壁１０ｒの上部に一端を固定して鍵に一体的に形成される。一点鎖線で示した弾性片３３は鍵１の支持部材２に対する非挿着時の状態を示したもので、実線の弾性片４３は、その挿着状態を表している。
【００３６】
鍵後端下部１１は、鍵後部１０から下方に前実施例より長く伸びて形成され、第２弾性片１４の横変位可能部も前実施例より下方に設けられ、その側方に設けられた突起１４ｐｐも、支持部材２の透孔２１ｖの下水平部ｈ２近傍に設けられる。鍵後端下部１１が、かなり下に延設されているので、上記透孔２１ｖは、前側縁に設けた回動支持部２２を含む上水平部ｈ１と、すべり部２１ｓを後側縁に設けた上記下水平部ｈ２と、該両水平部間を連結する垂直部ｖとからなる構成を有している。
【００３７】
この実施例の合理的な特徴は、必然的に設けなければならない錘１Ｗｗの逃げ空間としての凹部２ｈ１を形成した突部２ｐと、鍵後端下方に延設した下部１１の回動を許容して保持する立ち上がり部２５とで、支持部材２の脚部を構成し、鍵盤装置を支える構成とした点である。つまり、棚板２０に対し、ＵＳＰ４６０２５４９，ＵＳＰ４９０１６１４における支持部材を支持する支柱等の支持部を別部材として設けることなく鍵を浮設することができる。なお、立ち上がり部２５の後方には、補強用リブ２５１が２〜４鍵幅毎に設けられている。
【００３８】
そして、鍵挿着時に立ち上がり部２５の前壁に弾性片３３がガイドされつつ、両サイドの該垂直部ｖによって、鍵後端下部１１の外側両側壁がガイドされて、前面は斜面１１ｓが回動支持部２２との当接スライドによってガイドされて、図５、図６のような鍵の支持部材２への挿着状態となる。この状態において、鍵挿着時の弾性片４３は、上片ａとすべり部２１ｓとのｃ点での当接により、ベクトルａ２を発生し、鍵回動中心ｏを通る線分ａ２の法線との交点ｐと該中心ｏとからなる線分ｏｐをモーメントの腕長とし、該線分ｏｐにベクトルａ２を乗じたベクトルＴ１として表される鍵復帰力を発生する。その結果、前実施例のベクトルＴとこの実施例のベクトルＴ１とでは、Ｔ１＞Ｔの関係になっていることがわかる。何故なら、Ｔ１の腕長ｏｐの方が明らかに大きい。また、金属バネであるが故にバネ材の断面積、断面形状、材質等により、バネ力を増すことができ、バネ力を大に設定しても経年変化による弾性回復力の低下を小さくできる。さらに、すべり部２１ｓと弾性片４３との当接による弾性片の磨耗が、樹脂より少ないため、バネのバネ力の経年変化も少ないことと合わせて、長期にわたりタッチ間が変化しない。
【００３９】
次に、回動部材を質量体として構成した場合の実施態様（第３実施例）を図７及び図８によって説明する。図７は、第３実施例における鍵盤装置の側断面図、図８は、質量体と支持部材との嵌合構造及び質量体と鍵との嵌合構造を示した要部分解斜視図であって、この実施例の最大の特徴は、ＵＳＰ４６０２５４９またはＵＰＳ４９０１６１４等の従来に見られる鍵及び／または質量体の基準位置方向への復帰バネをなくしてしまって簡素化した点にある。一般に鍵復帰手段は、必ず必要であって、この実施例でも質量体３００の自重それ自身によって形成されている。
【００４０】
鍵１００は、側壁１２１、１２２を有した断面コ字状をしており、鍵後部１１０の鍵後壁１１０ｒに設けられた凹面円弧状回動支点部１１２を、支持部材２００の水平主部２１０後方に設けた支点部透孔２１の後縁に形成した凸面円弧状回動支持部２２２に嵌合係着させた状態で、回動自在に支持されている。
支持部材２００は、前記水平主部２１０と、前方の鍵スイッチ保持部２２５等を有する前方支持部２２０と、該主部２１０と該前方支持部２２０との境に位置し棚板２０に対し鍵盤装置全体を浮設させるための前垂直リブ壁２３０と、水平主部２１０の下面に主要鍵間位置に鍵長手方向に沿って垂設した補強リブ壁２４０とからなり、これらは全て樹脂で一体成形されているが、金属で構成することもできる。そして該リブ壁２４０は、リブ壁２３０と水平主部２１０とを所定距離を隔てて一体的に連結されている。
なる。
両リブ壁２３０、２４０には、半オクターブ程度毎に柱状の太い幹部２３１、２４１を備えている。リブ壁２３０の頂部には各鍵に対応する質量体３００を回動自在に支持する凸円弧の回動支持部２３２が設けられ、鍵幅方向の中心には、凸状リングまたはリング凹溝（図７では凹溝２３３）が形成されている。
【００４１】
また、前方支持部２２０には、各鍵毎に透孔２２６が設けられ、該透孔２２６の前後部下面にスイッチ用嵌合リブ２２７、２２８が突設されて、その両リブ間の嵌合凹部２２９にメガネ状鍵スイッチｓｗが配設され、さらにリブ２２７の一部で固着されたスイッチ用基板４００が配設される。該支持部２２０のさらに前方にはその上面に質量体ガイド突起２２１が突設され、その突起２２１のさらに前方には、補強部２４ａ付き立設前壁２２４及び過押鍵時のストッパ受け部２２３（白鍵用）が形成されている。上記ガイド突起２１１は、白黒鍵共に鍵長手方向の同一位置に形成される。図７のガイド突起２１１は、白鍵用を描いたものだが、黒鍵用のそれも図７において同位置に表される。なぜそのような構成が可能かと言うと、鍵の質量体駆動部である駆動片１２４及びゴム状弾性片１２７（後述）とそれを受ける力伝達部３２０及びその先端３２３、３２７（後述）とを白黒鍵でほぼ同一位置にし得るようにしているからである。即ち、黒鍵１００Ｂの駆動片（図示せず）を隣り合う２白鍵の下を潜らせて長靴状に設け、該長靴の爪先部に該ゴム状弾性片を固着して、これで力伝達部３２０の先端を駆動するようにすればよい。正確には、黒鍵用ゴム状弾性片の位置は、上記ガイド突起２２１が白黒鍵同一位置にし得る程度に、白鍵のそれ（１２７）より少し手前側（鍵自由端側）に設定される。その意味は、鍵の演奏操作部押下時に白黒鍵同一タッチ感を出すためである。なお、２３ａは、白鍵用フェルトであり、フェルト２１８は、黒鍵１００Ｂの過押鍵時の受け部材であって、フェルト２３ａ，２１８共にフォルテシモ程度では鍵と接触しない。
【００４２】
水平主部２１０の後部上面には質量体の上限移動を規制する受け部２５０が形成され、この下面に質量体ストッパフェルト２５１が固着され、棚板２０の上面またはリブ壁２４０を横切って、リブ壁２４０の下部に質量体の下限ストッパフェルト２４２が後付けにて配設される。このフェルト２４２は、質量体３００を支持部材に挿着した後、リブ壁２４０の下端に設けたヒンジ部ｈｇを介して連設された蓋部材ｌｄに固着されてから図示のように配設される。
【００４３】
質量体３００は、水平主部２１０と棚板２０とで形成される空間に、前記垂直リブ壁頂部の回動支持部２３２を介して、一点支持にてシーソー構成で配設される。該質量体３００は、鉄製棒状金属部３５０と、この一部を樹脂にアウトサート成形にて埋設させた樹脂加工部３１０とからなり、該樹脂加工部３１０は、力伝達部３２０と金属支持部３４０と回動支点部３１１とからなる。該回動支点部３１１は、質量体３００を１：３ないし１：４に分割した分岐点に配設され、前記回動支持部２３２に対し回動自在に嵌合させる。嵌合時には、円弧凸状３１２が、溝２３３に回動スライド自在に嵌合して、鍵並び方向の揺動及びガタツキを規制する。
【００４４】
力伝達部３２０は、多機能部材であって、文字どおりの鍵から質量体への力伝達機能を具備し、質量体３００の支持部材（支持部２３２）への挿脱時に質量体が、スムーズに挿脱操作されるための被挿脱ガイド機能を有すると共に、挿着後の鍵操作時においては、鍵及び／または質量体の並び方向の揺動が規制される被操作ガイド機能を有している。さらに、押鍵センサ駆動機能と、質量体が支点へ押し付けられる被圧接機能と、鍵操作時の質量体脱落防止機能の一部とを担っている。
【００４５】
該力伝達部３２０は、側壁３２１、３２５を有し、端部３２２と端部３２６とで鍵復帰時の鍵と質量体との離れ防止片を構成し、端部３２３、３２７で押鍵時の力受け部を構成している。また、端部３２３、３２７の先端内側壁３２４、３２８にて前記被操作ガイド機能を果たす被ガイド片を構成している。この被ガイド片としての先端内側壁３２４、３２８を、図７に示すごとく、先端方向（図７の左方）に向かうに従い末広がりの八字状にするか、ガイド突起２２１の先端（上方）を、鍵幅方向に対し他より細く形成することにより、質量体の支持部材への挿着最終段階での嵌合を容易にすることができる。そして、端部３２２、３２６と端部３２３、３２７との間に凹部３２９を有し、鍵前部１２０の下面に形成した質量体駆動片１２４の下面１２５の透孔１２６に圧入嵌着されたゴム状弾性片１２７を上記凹部３２９に挟み込み、押鍵時に弾性体１２７の表面と凹部３２９とをスライド可能にすることで、鍵１００からの力を質量体３００に伝えている。即ち、図８の駆動片１２４をｘ方向に約９０度回転させた時の透孔１２６に図示状態の弾性片１２７をその溝部ｇにて嵌合させると、図７における鍵１００と質量体３００との嵌合状態が得られる。
【００４６】
前記力伝達部３２０は、両側壁３２１、３２５を連結し、質量体３００の支持部２３２への挿入時の被ガイド片でもある溝底部３３１を側壁３２１、３２５間の底部に形成し、各側壁３２１、３２５内側と溝底部３３１とで挿脱用被ガイド溝３３０を構成する。また、上記溝底部３３１の下面には、スイッチ駆動片３３４が一体成形され、押鍵時にスイッチｓｗを順次ＯＮする。そして上記溝３３０の先端は、斜面３３２で形成され、図７の下方から質量体先端を挿入する場合、水平主部２１０の前方に一体成形された質量体挿入時及び挿着時の弾性ガイド片２１１先端折曲部２１２と支持部２３２との間隙が、該ガイド片２１１を予め実線で示したように形成しておき、質量体溝底部３３１斜面３３２からの圧入により、容易に点線のごとく広がるよう構成している。なお、該弾性ガイド片は、図９で示すように下に凸のく字状あるいはＵ字状弾性ガイド片２１１ａにすることによって、その弾性（バネ性）をより高めることができる。そして上記溝底部３３１の後部においては、回動支点部３１１が回動支持部２３２に嵌合した時に安定状態を形成するように、折曲部２１２の落ち込み部３３３を形成している。
【００４７】
この落ち込み部３３３に折曲部２１２が嵌合した状態で、鍵に連動した質量体は回動するが、保守点検時に質量体を支持部材から離脱する場合は、折曲部２１２の溝底部３３１に対する当接部が小円弧に形成され、かつこの保持部であるガイド片２１１が弾性を有しているので、鍵を支持部材から外すと共に質量体樹脂加工部３１０のリブ壁２３０対向面がリブ壁２３０に今まさに当接しようとする程度に質量体３００を回動すると、折曲部２１２が落ち込み部３３３からわずかに脱出した状態となり、そのまま斜め下方に質量体３００を引き抜くだけで、容易に離脱できる。
【００４８】
上記弾性ガイド片２１１は、質量体の支持部材への挿着時及び離脱時に被ガイド溝３３０に嵌合し、両側壁３２１、３２５を案内すると共に、鍵操作時の質量体回動においては、両側壁３２１、３２５の後方を常に案内する。この時質量体先端は、その端部内側壁３２４、３２８が支持部材から突設したガイド突起２２１に案内される。これによって質量体３００は、ふらつきのない確実な上下動が可能になり、質量体先端にてスライド回動可能に結合された鍵もふらつきのない上下動を可能にしている。このようなメカニズムにより、図７において突起２２１を実線で示すとおり前記両ＵＰＳに見られた鍵ガイド片をなくすることができた。支持部材から突設される鍵ガイド片がなくても、グリッサンド奏法によって鍵がその並び方向に変位することがなく、スムーズな上下動が可能になった。
【００４９】
但し、図７において、鍵から見た場合の鍵ガイドは、実は質量体ガイドであるので、鍵の下方に位置することになり、ガイドがあまくなる。そこで鍵が横に鍵間幅以内のわずかな移動を許容してもよいように、鍵支点において、鍵前方から見てローリング方向のみ禁止する鍵盤を開示した特開平６ー１４９２２９等の支点構造を用いる方がよい。また、鍵ガイドの確実性を期すため、図７の点線に示すように質量体ガイド片である突起２２１をそのまま上方に延設した鍵及び質量体兼用の操作ガイド片としてもよい。なお、図８の孔２１３は、保守点検時に万一ガイド片が折れてしまった場合に、金属製板バネを後付けできるようにするための孔である。また、金属支持部３４０は、リブ部及び金属支持をさせる部位を除いて薄壁になっている。
【００５０】
鍵１００については、第１、第２実施例に示されない特徴のある構成を有するもので、鍵の前面１２３とは反対の鍵後壁１１０ｒに設けられた回動支点部１１２を回動支持部２２２に、第１弾性片１１３によって後方に付勢させている。前実施例では、鍵を前方に付勢させたが、後方に付勢してもよいことを示したものである。図７の当該部分は、図３（ａ）のｄ−ｄ断面に対応させて示しており、支持部材から突設させた突部状ガイド片（図３（ｃ）の番号２４）などは、図示を省いている。該第１弾性片１１３は、上片１３ａと下片１３ｂとで構成された縦断面く字状片からなり、鍵後壁１１０ｒのすぐ前方に補強リブ壁１１６を切り欠いて鍵後端下部１１１まで延設されている。その側方に並設（鍵幅内で鍵幅方向に弾性片１１３と並設）され、上部にヒンジを備えた変則５角形の第２弾性片を設けており、上部をヒンジ構造とすることにより、該第２弾性片の下方は、鍵幅方向に変位可能にしている。そして第１弾性片１１３と向き合い、く字状凹部ｎに常時突出嵌入するように該第２弾性片側方に突起１１４ｐが設けられ、鍵１００の支持部材２００への挿着時における透孔２１への鍵後端下部の挿入時に、一時的に該く字状凹部から脱出するように、突起１１４ｐが設けられている。
【００５１】
なお、鍵挿入時における第２弾性片変位を自動的にさせるための突出片が、図３（ｃ）とほぼ同構成で水平主部２１０の透孔２１前縁近傍に立設され、鍵挿入時の初期時に上記下片１３ｂが、該前縁に当接して、鍵後端方向に第１弾性片１１３が変位する直前または同時進行にて、該突状片によって第２弾性片の下方一辺が押圧されて、第２弾性片が鍵幅方向に変位する。該突起１１４ｐは、該鍵挿着後鍵回動時及び非回動時においては該く字状凹部ｎに嵌入している。
【００５２】
そして、支持部材２００からの鍵離脱手法として、治具（マイナスドライバ）挿入用透孔１１５を鍵表面に設け、ここからの治具挿入にて第２弾性片の横変位可能部に設けられた突起１１４ｐを横変位させて、鍵を手前側に引きつつ後方を持ち上げるようにする。鍵挿入時においては、各弾性片の向きが反対なだけで、前実施例とほぼ同様に作用する。なお、透孔１１５の上方には、操作パネル２６０が配設されるので、見え懸かり上も問題はない。
【００５３】
この実施例では、第１弾性片１１３の上辺１３ａが透孔２１の前縁に設けられたすべり部２１ｓを斜め下から斜め上方へ押し付けており、鍵回動中心回りの回転トルクは、反時計回りとなっているが、質量体の自重で鍵復帰力を発生させ、この復帰力の方が該回転トルクより大きいので、鍵は、非押鍵時は上方に位置（実線状態）することができる。押鍵時は、二点鎖線で示す状態となる。
この実施例では、鍵を後方に圧接する手法の方が、支持部材への鍵及び質量体の組み込みをスムーズにすることができる。さらに第１弾性片１１３の作用で、「負」の鍵復帰力を発生させており、非押鍵時の力伝達点（ゴム状弾性体１２７の部分）において質量体を常に下方に押し付けているので、押鍵初期時に鍵から質量体への力伝達がすばやく行われる長所も備えている。もしこれを前実施例のようにすれば、押鍵初期時にわずかなクリアランスを生じさせる原因にもなり、例えば速弾きにふさわしくないことも起こり得る。
上記「負」の鍵復帰力を発生させ、なおかつその復帰力が半恒久的に変化しにくくするため、第２実施例（図６）の構成を第３実施例（図７及び図８）に適用してもよい。その場合、第１弾性片３３と回動支点部１２とを図７で示すように左右逆構成にしてもよい。
【００５４】
さらにこの実施例では、質量体に対する弾性ガイド片２１１それ自身の弾性により、質量体を支点方向（回動中心方向）に押し付けると共に、質量体挿着状態において、ガイド片２１１が溝底部３３１の斜面３３５を下方に付勢するので、図７、図８において質量体３００に時計回りの復帰力を与える。これによって、特に押鍵状態からの質量体の戻りがよくなるので、上記鍵の第１弾性片１１３による負の復帰力と合わせて、速弾き等がよりよくできる。
【００５５】
また、前記速弾き好適効果を耐久性を持って半恒久的に付与するため、図１０の第４実施例に示すように、該ガイド片２１１に代えて、１オクターブまたは数オクターブ共通の共通基端部からなる共通取付部２１５を備えた後付けによる櫛歯状金属板バネ（質量体挿入時のガイド片）２１６、２１６、、、で形成し、ネジ２１７等によって支持部材の水平主部２１０前端部に一体化させてもよい。
この第４実施例において、第３実施例と同一またはほぼ同一部分は同一番号を付してその詳細を省略するが、この実施例では、前記の他、前実施例にない特徴を備えている。それは、質量体挿入時のガイド片２１６、２１６、、、、が、操作時のガイド部（ガイド突起２２１）に向かって延びて形成されていることである。これにより、質量体挿入時のガイド機能がますます充実し、矢印ａ３方向に質量体を押し込むという操作をするだけで、操作時の被ガイド部である端部先端内側壁３２４、３２８をガイド突起２２１に導くことができる。しかもガイド片２１６は、Ｕ字状を成していることから弾力性に富み、耐久性を持って半恒久的に回動支持部への質量体押しつけ及び／または質量体復帰機能を有する。
【００５６】
また、前記両実施例では、質量体３００の支持部材２００への挿着に関し、第１段階で弾性ガイド片２１１（２１６）が、壁３２４、３２８のハ字状部をガイドする。そして、質量体３００を反時計方向に回しながら左方に挿入する第２段階では、先端折曲部２１２が斜面３３２を登り、挿脱用被ガイド溝３３０の溝底部３３１を経て落ち込み部３３３に落ち込む直前まで、弾性ガイド片２１１（２１６）が質量体３００をリード（ガイド）する。その後、上記ハ字状部がガイド突起２２１の上部にさしかかり回動支点３３１が回動支持部２３２に嵌合する第３段階では、弾性ガイド片２１１（２１６）とガイド突起２２１とが協導して質量体３００を導く。即ち、上記ハ字状部が、ガイド突起２２１にガイドされて、壁３２４と壁３２８は、ガイド突起２２１の両サイドに位置すると共に、回動支点部３１１が、質量体回動支持部２３２に、凹溝２３３と円弧凸状３１２が係合されながら嵌合される。
【００５７】
また、質量体３００の支持部材２００への挿着後質量体回動時は、円弧凸状３１２が凹溝２３３にガイドされつつ、これより遠い弾性ガイド片２１１で挿脱用被ガイド溝３３０の側壁３２１、３２５がガイドされつつ、壁３２４、３２８がガイド突起２２１にガイドされると言う三重のガイド機構によって、確実に質量体回動がガイドされる。
【００５８】
特に、質量体の支持部材への組み込み手順において、上記３ステップ工程にて挿入初期から挿入終了まで確実にガイドされる機構を採用したので支持部材を組み込み基台上に固定した状態（図７において棚板２０を取り除いた状態）で、ロボットアームによって質量体３００を下方から挿入し、その後同アームによって鍵１００を持ち、鍵１００を上方斜め左上から右下に向かって挿入することも可能である。即ち、鍵及び質量体の支持部材２００への自動組み込みを、ロボットアームによる簡単なシーケンス制御によって行うことも可能である。
【００５９】
次に図１１によって、第５実施例を説明する。図１１は、回動部材を質量体とし、弾性片を質量体側（回動部材側）に設けた実施例である。この図による前例と同番号部材は同一またはほぼ同一部材を表しているので詳しくは説明しない。この実施例の力伝達部３２０ａは、図の左側に端面図として示したように、１枚刃（図８は２枚刃）で構成され、そこには質量体側の支点部（回動支点部３１１）近傍に一体的に弾性片３３７が形成されている。この実施例では、質量体３００の質量体回動支持部２３２に対する挿着時（挿着しようとする時）並びに非押鍵時及び押鍵時を通して回動部材側（質量体樹脂加工部３１０における力伝達部３２０ａ）に設けた弾性片３３７の弾性によって、質量体３００の回動支点部３１１を回動支持部２３２に常に押し付けるよう当接させている。この場合、質量体を支持部材に挿着していない時には、弾性片３３７は点線で示すようにその弾性を解放させているが、挿着された状態では、弾性片３３７の外側円弧面（挿着された時に回動中心を中心とする円弧になる）が、櫛歯状パーティション部２１８の谷部２１４を圧接するように構成される。
【００６０】
この実施例では、質量体の支持部材への挿着ガイドは２つのパーティション部２１８、２１８対向面によって行われ、挿着寸前のガイド、及び挿着後の操作ガイドとしては、１枚刃の力伝達部３２０ａの端部（図示せず）を２叉構造のガイド突起（図示しないが２１１相当部）にてガイドすることで行われる。このガイド突起は、隣鍵の各一方を共通の１つの突起で構成してもよい。
【００６１】
また、前述の図７〜図１１の実施例において、弾性片３３７またはガイド片２１１の当接部にグリス等の潤滑剤を塗布した方が望ましい。塗布するしないに関わらず、質量体の移動により摩擦感が発生するが、図１１で谷部２１４にグリスを塗布したものでは回動中心からの距離を有していることでもあり、心地よい摩擦感が得られる。なお、鍵回動支点に該潤滑剤を塗布してもこの摩擦感効果がさらに増す。この摩擦感は、鍵の戻りが悪くならない程度にする必要がある。周知のように摩擦の力学は、静摩擦＞動摩擦の関係にあり、鍵押し初めに少し負荷が掛かり、その後少し軽くなるタッチ感となる。また、特にピアニシモ以上の普通のタッチ感では、質量体移動による動的タッチ感が得られる。
【００６２】
さらにまた、前述の図７〜図１１の実施例において、前述した質量体ガイド機構を設けているため、隣接する質量体対向面間のクリアランス（図１１では質量体樹脂加工部３１０下方のところ）を、リブ壁２４０が存在する位置を除いて、最小限（例えば１ｍｍ、理論的には限りなく零に近い値）に設定することができる。別な表現をすれば、該クリアランスを最小限にすることができるので、その分鍵並び方向のスペースに余裕ができ、この余裕ができたスペースに複数のリブ壁２４０を設けることができた。そして、複数のリブ壁２４０を設けることができたため、支持部材を頑強に構成することができる。鍵及び質量体を回動自在に支えなければならない支持部材を頑強に構成することができると言うことは、鉄板等の金属板材のような重くかつ強靱でなおかつ加工しにくい材料を使用することなく、支持部材全体を軽くかつ鍵盤動作できる程度に強靱でなおかつ加工しやすい樹脂部材で形成することができる。従って、前述した質量体ガイド機構による質量体組み込み容易性さらには鍵組み込み容易性と相俟ってかなりの製品製造のコストダウンを図ることができる。
なお、図７〜図１１の実施例において、従来の鍵及び質量体の復帰バネをなくす構成を実現するため、図７の鍵用弾性片１１３を図７の質量体用弾性片２１１のように、支持部材側に設けてもよい。
以上によって、この発明に関することを説明したが、この発明に係る鍵盤装置は、電子楽器の鍵盤装置のみならず、鍵盤ハーモニカ、練習用鍵盤装置などにも適用される。
【００６３】
【発明の効果】
以上説明してきたように、本発明によれば、鍵及び／または質量体等の回動部材の支持部材への挿着を容易にし、挿着後においては、該回動部材の基本機能（回動部材の支持部材への付勢または回動部材の支持部材に対する脱落防止）を維持可能にした。該基本機能を維持することで、半永久的に安定した演奏操作も可能となった。
【図面の簡単な説明】
【図１】本発明の第１実施例を一部側断面図として示す鍵盤装置の全体図である。
【図２】同第１実施例の鍵後部を後上方から見た部分的斜視図である。
【図３】同第１実施例における鍵支点近傍を描いた詳細図である。
【図４】同第１実施例における鍵の支持部材への挿入状態遷移図である。
【図５】同第２実施例を一部側断面図として示す鍵盤装置全体図である。
【図６】同第２実施例の鍵後部を側断面図として示す押鍵時の図である。
【図７】同第３実施例を側断面図として示す鍵盤装置全体図である。
【図８】同第３実施例における質量体と支持部材との嵌合構造及び質量体と鍵との嵌合構造を示した要部分解斜視図である。
【図９】同実施例における質量体押付（付勢）用弾性体の変形例である。
【図１０】同第４実施例における質量体と支持部材との嵌合構造及び質量体と鍵との嵌合構造を示した要部分解斜視図である。
【図１１】同第５実施例であって回動部材を質量体とし、弾性片を質量体側（回動部材側）に設けた実施例である。
【符号の説明】
１、１００……鍵（回動部材）、
１２……鍵回動支点部、
２２……回動支持部（支持部材側の鍵用回動支持部）、
２、２００……支持部材、
１３、４３、１１３……弾性片（第１弾性片）、
１４……第２弾性片、
ｎｎ……許容空間、
３００……質量体、
２１１……弾性ガイド片（弾性片）、
３１１……回動支点部（質量体側の支点部）、
２３２……回動支持部（支持部材側の質量体用回動支持部）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a keyboard apparatus for an electronic musical instrument, for example, and relates to a keyboard apparatus that simplifies a spring material used for the electronic musical instrument and that can be easily assembled or disassembled into a support member of a rotating member such as a key.
[0002]
[Prior art]
In general, a keyboard device for an electronic musical instrument has a key return spring that urges a key away from a support member as disclosed in Japanese Utility Model Publication No. 2-16393 or Japanese Patent Laid-Open No. 63-125991, and this spring Has a key drop prevention member as a separate member from the spring so as not to be detached from the support member during intense key operation and any key operation.
[0003]
[Problem to be Solved by the Invention]
However, in the above prior art, the installation work of the spring interposed between the key and the support member has to be complicated. For example, in the former prior art, the spring is installed by temporarily locking the spring to the key with the back of the key facing up by the technique of Japanese Patent Publication No. 64-10077, and mounting the spring-equipped key on the support member. In the latter prior art, with the key temporarily locked to the support member, the support member is turned and the spring is inserted, and when the operation is completed, the support member is turned over. Among these operations, the operation of turning the key or the support member and attaching the key or / and the spring is the most complicated operation. Even if it is automated, a large robot is required and the cost is increased. Assembling work to the support member such as was done manually.
[0004]
From such a background, it has been desired to facilitate the insertion into the key and other supporting members while maintaining the basic function of the key operation.
Therefore, in the present invention, after the insertion, the basic function of the rotating member (the supporting member of the rotating member) is made while facilitating the insertion of the rotating member such as the key or the mass body to the supporting member. It is an object of the present invention to hold the urging force or the rotation member against falling off from the support member.
[0005]
[Means for Solving the Problems]
  In order to achieve the above object, a keyboard device according to claim 1 of the present invention provides:A rotating member (1, 100, 300) and a supporting member that rotatably supports the rotating fulcrum portions (12, 112, 311) of the rotating member by the rotating support portions (22, 222, 232). In the keyboard device having (2, 200, 230), when the rotating member (1, 100, 300) is attached, the rotating support portion and the rotating support portion (12, 112, 311) prior to the rotating fulcrum portion (12, 112, 311) When the guided surface (11s, 331) to be in contact with the rotating member (1, 100, 300) is attached, the guided surface (11s, 331) is in contact with the supporting member and the rotating support portion ( 12, 112, 311) and the elastic piece (13, 43, 13 a, 337) to be pressed together with the rotating member, and the elastic piece (13, 43, 13 a, 337) Rotating fulcrum parts (12, 112, 311 Is supported by the rotation support portions (22, 222, 232) of the support member so as to be rotatable, the rotation fulcrum portions (12, 112, 311) of the rotation member are elastically moved to the support member. The rotating support portions (22, 222, 232) are always pressed against each other.
[0006]
According to the keyboard device of the first aspect of the present invention, the elastic piece provided integrally with the rotating member at the time of inserting the rotating member into the support member and at the time of rotating the rotating member after insertion. The rotating member is caused to act against the rotating support portion on the support member side. Accordingly, when the rotating member is inserted, the fulcrum portion of the rotating member automatically rotates when the rotating member (rear side) is pressed and inserted into the rotating support portion against the elastic piece. The elastic piece presses the rotation support part through the non-key-pressing and the key-pressing in the fitted state. Therefore, when the key is not pressed and when the key is pressed, a biasing force is generated so that the rotating member does not move away from the fulcrum (rotating support portion).
The elastic piece also acts like an insertion guide piece when the rotating member is inserted, so that the rotating member can be easily attached to the support member, and after the insertion, the rotating fulcrum is always pressed. Thus, an appropriate friction feeling can be given when the rotating member is rotated, and the touch feeling is improved. In addition, depending on how the elastic piece acts on the rotation fulcrum, a key returning force can be generated.
[0007]
  In order to achieve the same object, a keyboard device according to claim 2 of the present invention provides:The keys (1, 1W, 1B, 100) rotated by the key pressing operation and the rotation fulcrum portions (12, 112) of the keys are rotatably supported by the rotation support portions (22, 222). A keyboard device having a support member (2, 200), an elastic piece integrally formed with the key (1, 1W, 1B, 100), and an allowable space (nn) between the rear wall of the key Can be elastically deformed in the direction of narrowing or widening, and in contact with the support member when the key is attached and the pivot fulcrum portion of the key is pivotally supported by the pivot support portion. A first elastic piece (13, 43, 113) that always presses the rotation fulcrum portion of the key against the rotation support portion; and an elastic piece formed integrally with the key, wherein the first elastic piece and the key Protrusions (14p, 14pp) that can be inserted into and removed from the permissible space (nn) between the rear wall And, when the key is attached, abuts against the support member and elastically deforms to remove the protrusion from an allowable space between the elastic piece and the rear wall of the key. A second elastic piece (14, 114 (p)) to be inserted into an allowable space between the elastic piece and the rear wall of the key is provided..
[0008]
According to the keyboard device of the present invention, the key is supported by the first elastic piece integrally provided on the key at the time of inserting the key into the support member and after the key is inserted into the support member. It acts to press against the part. In this case, the movement of the first elastic piece may or may not be restricted when the key is inserted and when the key is rotated after being inserted. When turning after the key is inserted, the second elastic piece (in the embodiment, on the key side so that the key is not displaced even if a displacement other than the rotation operation (for example, pulling / pushing the key back and forth)) is given. Is provided in the permissible space formed by the rotation fulcrum portion of the key and the rotation support portion of the support member, and when the key is inserted into the support member, the key insertion operation is interlocked. Then, the second elastic piece is elastically displaced so as to release the interruption to the allowable space.
When removing the inserted key from the support member for maintenance inspection, in the embodiment, a jig such as a flathead screwdriver is inserted between the opposing side surfaces of the first elastic piece and the second elastic piece, If the key is pulled away in the direction away from the support member (upward), it can be removed. To borrow the above expression, it is only necessary to use a flathead screwdriver to help cancel the interruption of the second elastic piece to the allowable space when the key is released. In any case, it does not leave the support member.
[0009]
  In order to achieve the same object, a keyboard device according to claim 3 of the present invention provides:The mass body (300) that swings in conjunction with the rotation of the key (100) and the rotation fulcrum portion (311) of the mass body are rotatably supported by the mass body rotation support portion (232). A keyboard device having a support member (200), comprising an elastic piece (211, 211a, 337) provided integrally with the support member and facing the mass body rotation support portion, and the support of the mass body When attached to the member, the mass body passes through the gap between the elastic piece and the mass body support portion, and the rotation fulcrum portion of the mass body is rotatably supported by the mass body rotation support portion. In the state, due to the elasticity of the elastic piece, the rotation fulcrum portion of the mass body is brought into contact with the rotation support portion so as to be always pressed.
[0010]
  According to the keyboard device of the third aspect of the present invention, the support part is inserted when the mass body is inserted into the support member and after the mass body is inserted.MaterialWith the elastic piece provided integrally, the mass body is caused to act against the rotation support portion on the support member side. Thereby, when inserting the mass body, when the mass body is pressed against the elastic piece against the rotation support portion and inserted into the rotation support portion, the fulcrum portion of the mass body is automatically fitted to the rotation support portion, In the fitted state, the elastic piece presses the rotating support portion when the key is not pressed and when the key is pressed. Therefore, after the mass body is inserted into the rotation support portion, an urging force is generated so that the mass body does not move away from the fulcrum (the rotation support portion). Since the elastic piece acts like an insertion guide piece when the mass body is inserted, the mass piece can be easily attached to the support member, and after insertion, the rotary fulcrum is always pressed to press the key. It can sometimes give a moderate feeling of friction and makes the touch feel good.
[0011]
In general, in a keyboard device provided with a mass body, it is considered to use the weight of the mass body itself as a means for returning the key and / or mass body to the basic position. The keyboard device according to claim 3 of the present invention can also have a keyboard structure that falls into this category, and in the keyboard device according to claim 3 of the present invention based on such a keyboard device, the fulcrum of the key and the mass body The structure can be realized as a keyboard structure as long as there is a pressure contact action and / or a rotation member fall-off preventing action to the fixed part side (rotation support part) of the rotation member. That is, the rotating member return means other than the mass body can be made unnecessary. Therefore, the elastic piece that always presses the rotation fulcrum portion does not have to be basically strong. As an added value, it only needs to be a little stronger in order to generate a key touch friction. Accordingly, the keyboard device according to claim 3 of the present invention gives a great degree of freedom in designing the keyboard device, and does not use a durable metal frame such as an iron plate used in Japanese Patent Laid-Open No. 63-125991. For example, as shown in the third embodiment of FIG. 7, a resin frame that can be easily processed may be used. Therefore, the keyboard device according to claim 3 of the present invention may contribute to further cost reduction of the keyboard device in addition to the cost reduction of the built-in member.
[0012]
  In order to achieve the same object, a keyboard device according to claim 4 of the present invention provides:It has both the features of claim 1 and claim 3.
[0013]
According to the keyboard device of the present invention, the key and the mass body are formed by the elastic piece integrally provided on the support member or the rotating member when the key and the mass body are inserted into the support member and after the insertion. Is pressed against the rotation support portion on the support member side. As a result, when inserting both rotating members of the key and the mass body, if both rotating members are pressed and inserted into the respective rotating support portions opposed to the elastic pieces, the fulcrum portions of both rotating members are The rotating members are automatically fitted to the rotating support portions, and in the fitted state, both rotating members are attached to the fulcrum (rotating support portion) by the elastic pieces through the non-pressed key and the depressed key. Generate power.
That is, the same effect as that of the keyboard device according to the third aspect of the present invention is achieved, and the effect is also accompanied. The main effect of the invention of claim 3 is that in the keyboard device with mass body, a return leaf spring having a different configuration is provided at the time of inserting the key and / or member in the mass body as disclosed in JP-A-63-12599. It is in the point that can be made unnecessary.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 show an embodiment (first embodiment) according to claims 1 and 2 of the present invention when a rotating member is used as a key. More specifically, FIG. 1 is a partial side sectional view showing the entire keyboard apparatus according to the first embodiment, and FIG. 2 is a partial perspective view of the rear part of the key as viewed from the rear upper side. 3 is a detailed view of the vicinity of the key fulcrum, in which (a) is a rear view seen from the back, and (b) is a plan view seen from above the key and the support member (viewed along arrow bb in FIG. A). ), (C) is an elevation view of the support member as viewed from the rear (the cc arrow view of FIG. B), (d) is an arrow view of the dd section in FIG. (A) Arrow directional view of ee cross section in figure, (f) is an arrow directional view of the ff cross section in (a) figure.
[0015]
FIG. 1 is a view in which the key 1 is about to be fitted to the support member 2 via the key rear portion 10 and the guide piece 2g while the key stopper piece 1s is fitted to the through hole 2h of the support member. The key 1 is incorporated into the support member 2 by inserting the key rear end lower portion 11 into the fulcrum portion through-hole 21 while guiding the key 1. The key rear portion has a guide mechanism, which will be described later, when the key is assembled. By this guide mechanism, the key is smoothly inserted into the support member, and the rotation fulcrum portion 12 is fitted to the rotation support portion 22. . And at the time of key operation at the time of key insertion, the key return function may be given to the first elastic piece 13 fixed to the rear end of the key forming the main part of the present invention, or the elasticity thereof is weakened. It is a key switch that is driven by the actuator 1a when a key is pressed, and may be provided by a rubber-like elastic body 23 that constitutes a bowl-shaped movable contact. The first elastic piece 13 and the elastic body 23 Both may be assigned the function.
[0016]
FIG. 2 shows details of the key rear portion 10 and will be described with reference to FIG. The key rear portion 10 has a fulcrum function, a guide function when the key 10 is inserted into the support member 2, a pressure contact function of the key 10 to the support member 2, a key return function, and a key drop prevention function. First, a configuration having a fulcrum function will be described.
At the front end edge of the fulcrum portion through-hole 21 provided behind the support member 2, an arcuate rotation support portion 22 formed integrally with the support member 2 from a resin is provided, and is fitted to the rotation support portion 22. As shown in the figure, a recess-shaped rotation fulcrum 12 is provided on the rib wall 12r that connects the both side walls 1w1 and 1w2 of the key, and the fulcrum on which the key rotates between the rotation support portion 22 and the rotation fulcrum portion 12. Part.
[0017]
Next, the remaining four functions are complicatedly intertwined and each part or a plurality of parts work together to perform the four functions, which will be described together.
The key rear wall 10r, which is the back surface of the key rear end, is provided at a predetermined distance (for example, 4 mm) or more (8 mm in the embodiment) from the rib wall 12r that also serves as a reinforcement. By forming the slits d1, d2, and d3, two elastic pieces including the first elastic piece 13 and the second elastic piece 14 are formed. The reason why the rear wall 10r is formed at a predetermined distance is that the first elastic piece 13 is displaced forward when the key is inserted into the support member, and that the base of the second elastic piece is durable against elasticity. This is because it is desired to have a width in the longitudinal direction of the key so as to have a property.
[0018]
As shown in FIG. 3 (d), the first elastic piece 13 has elasticity by being formed slightly thinner than the thickness of the rear wall 10r. When the key is not inserted into the support member, the first elastic piece 13 is shown in FIG. (E) As shown in FIG. 4 (a), it is formed at the time of mold molding so as to protrude further from the rear end of the key as a whole, and has a letter shape when viewed from the side.
[0019]
The second elastic piece 14 is juxtaposed with the elastic piece 13, and its base portion 14f has a predetermined thin width, and the thickness of the rear wall 10r with respect to the longitudinal direction of the key as shown in FIGS. 3 (e) and 3 (f). It has a larger predetermined depth (distance in the left-right direction in the figure). From the center to the tip, an irregular pentagonal laterally displaceable portion 14v having an inclined surface 14s on the upper surface is connected to the base portion 14f via the triangular wide portion 14t with an increased thickness corresponding to the inclined surface 14s. 14v itself is not deformed, and the base 14f is displaced when the key is inserted. On the side of the elastic piece 13 of the triangular wide portion 14t, there is integrally provided a protrusion 14p that fits into the rectangular recess 13c of the elastic piece 13 when the key is not inserted into the support member and after insertion. ing. By forming a wedge with the lower two sides 141 and 142 of the pentagon of the laterally displaceable portion 14v, the side 142 is guided by the inclined surface 241 of the projecting guide piece 24 protruding from the support member 2 when the key is inserted, The second elastic piece 14 is deformed outward from the key, and the projection 14p is detached from the concave portion 13c so that the first elastic piece 13 can be deformed in the key tip direction. That is, the allowable space described in claim 2 of the present invention refers to a space formed by the recess 13c and the key rear wall 10r.
[0020]
This will be described in further detail with reference to FIG. 4 showing the state of insertion of the key into the support member. 4A shows a state in which the stopper piece 1s is fitted in the through hole 2h (see FIG. 1) and the rear of the key is hooked in the through hole 21, and when viewed as a cross-sectional view, FIG. It represents the same cross section as d). Accordingly, the cross-sectional display (hatched line) is omitted. The guide in the front-rear direction of the key is guided by the top portion 13t of the first elastic piece 13 on the front surface of the rear wall rising portion 25 of the support member 2, or the non-guide of the key rear end lower portion 11 by the rotation support portion 22. The inclined surface 11s comes into contact and begins to be guided.
[0021]
At the beginning of guiding, when the inclined surface 11s comes into contact with the rotation support portion 22, the distance D1 between the inclined surface 11s and the free end 131 of the first elastic piece 13 is slightly smaller than the key longitudinal direction distance D2 of the fulcrum portion through hole 21. Since the key rear end lower portion 11 easily fits into the through-hole 21 (D1 <D2). Even if the distance D1 is set to be larger than the distance D2 (D1> D2) because of the relationship in which the pressing force with which the key is pressed against the rotation support portion 22 by the first elastic piece 13 is set to a large value, It is only necessary to insert the key into the support member 2 while pressing the key against the portion 25. Otherwise, even if D1 <D2, the key insertion work is performed by using the rising portion 25 as the first guide portion of the key insertion. Therefore, when the key 1 is moved slightly downward while being pressed slightly against the rising portion 25, the state shown in FIG.
[0022]
That is, when making the transition from FIG. 4A to FIG. 4B, the lowermost part 11u of the key rear end lower part 11 comes into contact with the support member 2 first among the lower parts of the key rear part. 142 contacts the inclined surface 241. Accordingly, the second elastic piece 14 is deformed outwardly while receiving the restriction in the key width direction at the lower side surface of the key rear end lower portion 11 and the side edge portion of the through hole 21, and the elastic piece 14 becomes the recess 13c. The free end 131 and the lower piece 132 of the elastic piece 13 are deformed in the key tip direction while sliding on the slide portion 21s formed integrally with the rear edge notch portion 21r of the through hole 21 after being attached or molded. (See FIG. 4 (b) to FIG. 4 (c)).
[0023]
The state shown in FIG. 4 (c) shows a state in which the rotation fulcrum portion 12 is about to be fitted to the rotation support portion 22, and the terminal end 11 e of the inclined surface 11 s is lowered below the horizontal plane of the support member 2. Then, the state immediately changes to the state of FIG. 3D by the elastic action of the upper piece 133 of the first elastic piece and / or the external key downward movement force. When the transition from FIG. 4C to FIG. 3D is performed, the key 1 moves forward with respect to the support member 2, so that the side 142 of the second elastic piece is in contact with the inclined surface 241 in the F direction. Canceled. As a result, the protrusion 14p instantaneously intervenes again in the recess 13c.
Once the state shown in FIG. 3D is reached, the elastic displacement of the first elastic piece is locked by the projection 14p, so that it does not come off the support member even if the key is lifted up and down.
[0024]
When the key is detached from the support member 2 at the time of maintenance and inspection, a jig such as a minus driver is provided between the key rear wall 10r and the rising portion 25 and between the side surface 134 of the first elastic piece 13 and the inclined surface 14s. What is necessary is just to lift the back of a key, inserting. This is because the insertion of the jig causes the second elastic piece 14 to be deformed outward, so that the projection 14p is detached from the recess 13c, and the first elastic piece 13 can be elastically displaced.
When the key is inserted and when the key is released, the second elastic piece is deformed outward from the key. However, when the intervention of the protrusion 14p into the recess 13c is released, a sufficient clearance is secured to displace the laterally displaceable portion 14v. Therefore, due to the entanglement with the adjacent key, the side 141 forming the wedge is notched in the key inner direction to form a hypotenuse.
[0025]
Here, a description will be given of which component performs the remaining four functions. The guide function when the key is inserted into the support member is mainly performed by the lower end 11 of the key rear end and the through hole 21 thereof. In particular, it is made up of the inclined surface 11s and the rotation fulcrum portion 22. In a broad sense, the first elastic piece 13 and the rising portion 25 are in contact with each other, and the first elastic piece 13 and the rear edge notch portion 21r that is the engaging portion. It can be said that the sliding portion 21s also assists the key insertion guide function.
[0026]
The function of pressing the key to the support member is mainly performed by the lower piece 132 and the sliding portion 21s when the key is inserted, and by the upper piece 133 and the sliding portion 21s when the key is operated after the key is inserted. These functional members (the upper piece 133 and the sliding portion 21s) assist the key drop prevention function after the key is inserted.
[0027]
The key return function generates a vector a1 by the contact between the upper piece 133 and the sliding portion 21s, and a line segment op composed of the intersection point p of the normal line of the line segment a1 passing through the key rotation center o and the center o. Is a function having a key restoring force expressed as a vector T obtained by multiplying the line segment op by a vector a1. If the part is shown, the first elastic piece 13 and the related part that contacts this Plays in. In this embodiment, the rubber-like elastic piece 23 of the key switch assists the function. Which of the elastic piece 13 and the elastic body 23 is main or subordinate is a matter of design, and either one of them can be made very close to zero. In some cases, the key return force of the elastic piece can be made negative in a modification of the first elastic piece 13.
[0028]
The key drop prevention function is provided by the second elastic piece 14, and more specifically, the first elastic piece 13 is allowed to move forward of the key after the key is inserted into the support member 2 except when the key is inserted or removed. This is achieved by the configuration in which the protrusion 14p is inserted into the space (the space nn formed by the recess 13c).
[0029]
Next, another embodiment for realizing the key recovery function will be described. Before that, various optimum embodiments in the case of commercialization will be considered by organizing the advantages and disadvantages of the keyboard device in the embodiment.
First, the first elastic piece, which is a multifunctional member in the above embodiment, is integrally molded with a resin as a key, and it is possible to attach the key to the support member by one-touch. The return spring was eliminated, and the cost could be greatly reduced in terms of configuration and assembly workability. However, the keys of the keyboard device must be able to withstand hundreds of thousands of key releases. Considering the previous example from this point of view, if the spring property of the first elastic piece is set strongly, the secular change or the decrease in the elastic recovery force for a long time is concerned because it is a resin. Therefore, in the previous embodiment, the keyboard device as shown in FIG. 1 seems to be optimal, taking advantage of its advantages, without setting the spring property of the first elastic piece too strongly, and borrowing the key returning force by the bowl-shaped rubber switch. It is. Alternatively, for example, a third embodiment (FIG. 7 and FIG. 8) described later that borrows the key restoring force due to the weight of the mass body without setting the spring property of the first elastic piece too strongly will be the same as the previous embodiment. Expected disadvantages do not appear.
[0030]
Since the conventional keyboard device using the bowl-shaped rubber switch pursues low cost as seen in, for example, Japanese Patent Publication No. 6-31939, the key is configured to be commonly connected at the base end.
As a result, it is easy to incorporate the key into the support member, but there is an inconvenience that a large number of keys must be removed from the support member at the same time during maintenance and inspection even if there is an extreme failure. Further, after the maintenance, the key arrangement is slightly shifted, and the key operability may be deteriorated.
On the other hand, in the previous embodiment, even during maintenance, only the key corresponding to the maintenance section needs to be removed, so at first glance it seems inferior to the Japanese Patent Publication No. 6-31939. Is also dominant.
[0031]
Furthermore, consider a further optimal example of the superiority of the present invention over an intermediate model such as USP 4602549. In a keyboard device having a weight as a key, such as USP 4602549, the key return force must be generated sufficiently and with durability and durability. An embodiment (second embodiment) that clears this point will be described with reference to FIGS.
[0032]
A feature of the second embodiment is that a metal leaf spring whose elastic recovery force is difficult to decrease over a long period of time is adopted as the first elastic piece 33 (43), and the rotational moment of the rotation is set so that the key return force can be set large. The arm length is increased.
FIG. 5 shows the entire keyboard device when the key is not pressed, with the key rear portion 10 shown as a side view and the other as a side sectional view. FIG. 6 shows the key rear portion 10 as a side sectional view. is there. 5 and 6, the same or substantially the same parts as those in the previous embodiment are denoted by the same reference numerals.
[0033]
As the overall configuration of the keyboard device, the white key weight 1Ww and the black key weight 1Bw are attached to the lower surface of the free end of the white key 1W and the black key 1B so as to increase the inertial mass when the key is pressed and to have a feeling of play. The metal leaf spring (43) is provided on the key rear wall 10r. And the light utilization key sensor which does not need to borrow the key restoration auxiliary force by the bowl-shaped rubber switch used in the previous embodiment is adopted. The support member 2 is provided with an upper limit stopper 2su with which the stopper pieces 1Ws and 1Bs provided below the key free end abut when the key is not pressed and a lower limit stopper 2sd with which the key lower surface abuts when the key is pressed.
The recess 2h1 is a relief hole for the white key weight 1Ww, and the through hole 2h2 is a relief hole for the black key weight 1Bw. Further, the weight 1Ww is fixed to the box portion constituted by the side walls 1w1, 1w2 on both key sides and the rib walls 1r1, 1r2 forming the front and rear walls with an adhesive or the like. The black key is constructed in the same way, but with a different weight and shape.
[0034]
The key-pressing detection mechanism has a pair of a light-emitting part made of an infrared light-emitting diode and a light-receiving part made of a phototransistor formed in a facing part with a predetermined interval formed by a through hole ksh, and a plurality of keys are integrated. A key sensor unit ksu obtained by molding is inserted into and removed from a key actuator shutter plate that passes through the through hole 2h2 provided in the support member 2 so as to overlap the through hole ksh. It comes to detect. By providing two light emitting / receiving parts for one key and forming the lower end of the shutter plate or the light emitting / receiving part in steps, a touch response switch can be formed by time difference sensing. Further, the entire stroke of the key pressing stroke can be sensed by configuring the shutter plate in gray scale.
[0035]
In FIG. 6, the first elastic piece 33 is made of a metal (steel) plate spring bent at the boundary between the upper piece a and the lower piece b, and the spring is previously placed in the mold when the key is manufactured in the mold. By placing the resin in a predetermined position and pouring the resin in that state, one end is fixed to the upper part of the key rear wall 10r and the key is integrally formed. An elastic piece 33 indicated by a one-dot chain line indicates a state when the key 1 is not inserted into the support member 2, and a solid elastic piece 43 indicates the insertion state.
[0036]
The key rear end lower portion 11 is formed to extend downward from the key rear portion 10 longer than the previous embodiment, and the laterally displaceable portion of the second elastic piece 14 is also provided below the previous embodiment, and is provided on the side thereof. The protrusion 14pp is also provided in the vicinity of the lower horizontal portion h2 of the through hole 21v of the support member 2. Since the key rear end lower portion 11 extends considerably downward, the through hole 21v is provided with an upper horizontal portion h1 including a rotation support portion 22 provided on the front side edge and a slide portion 21s on the rear side edge. The lower horizontal portion h2 and a vertical portion v connecting the horizontal portions are provided.
[0037]
The rational feature of this embodiment is that the protrusion 2p having a recess 2h1 as a relief space for the weight 1Ww that must be provided and the lower part 11 extending below the rear end of the key are allowed to rotate. The rising portion 25 that holds the support member 2 constitutes a leg portion of the support member 2 and supports the keyboard device. In other words, the key can be floated with respect to the shelf board 20 without providing a support portion such as a column supporting the support member in USP 4602549 and USP 4901614 as a separate member. Reinforcing ribs 251 are provided behind the rising portion 25 every 2 to 4 key widths.
[0038]
While the elastic piece 33 is guided to the front wall of the rising portion 25 when the key is inserted, the outer side walls of the key rear end lower portion 11 are guided by the vertical portions v on both sides, and the inclined surface 11s rotates on the front surface. Guided by the abutting slide with the moving support portion 22, the key is inserted into the support member 2 as shown in FIGS. In this state, the elastic piece 43 when the key is inserted generates a vector a2 by abutting at the point c between the upper piece a and the sliding portion 21s, and is normal to the line segment a2 passing through the key rotation center o. A line op consisting of the intersection point p and the center o is set as the arm length of the moment, and a key restoring force expressed as a vector T1 obtained by multiplying the line op by the vector a2 is generated. As a result, it can be seen that the vector T of the previous embodiment and the vector T1 of this embodiment have a relationship of T1> T. This is because the arm length op of T1 is clearly larger. Further, since it is a metal spring, the spring force can be increased by the cross-sectional area, cross-sectional shape, material, etc. of the spring material, and even if the spring force is set large, the decrease in elastic recovery force due to secular change can be reduced. Furthermore, since the wear of the elastic piece due to the contact between the sliding portion 21 s and the elastic piece 43 is less than that of the resin, the touch-to-touch does not change over a long period of time together with the fact that the spring force of the spring is less changed over time.
[0039]
Next, an embodiment (third example) when the rotating member is configured as a mass body will be described with reference to FIGS. FIG. 7 is a side sectional view of the keyboard device according to the third embodiment, and FIG. 8 is an exploded perspective view of a main part showing a fitting structure between the mass body and the support member and a fitting structure between the mass body and the key. Thus, the greatest feature of this embodiment is that it eliminates the key and / or the return spring in the direction of the reference position of the mass body, which has been conventionally found, such as USP 4602549 or UPS 4901614, and has simplified it. In general, the key returning means is always necessary, and in this embodiment, the key returning means is formed by the weight of the mass body 300 itself.
[0040]
The key 100 has a U-shaped cross section having side walls 121 and 122, and the concave arcuate rotation fulcrum portion 112 provided on the key rear wall 110 r of the key rear portion 110 is connected to the horizontal main portion 210 of the support member 200. In a state where it is fitted and engaged with a convex arcuate rotation support portion 222 formed at the rear edge of the fulcrum portion through-hole 21 provided at the rear, it is rotatably supported.
The support member 200 is located at the boundary between the horizontal main part 210, the front support part 220 having the front key switch holding part 225 and the like, and the main part 210 and the front support part 220. It consists of a front vertical rib wall 230 for suspending the entire apparatus, and a reinforcing rib wall 240 suspended along the longitudinal direction of the key at the position between the main keys on the lower surface of the horizontal main portion 210, all of which are made of resin. Although formed, it can also be made of metal. The rib wall 240 integrally connects the rib wall 230 and the horizontal main portion 210 with a predetermined distance therebetween.
Become.
Both rib walls 230 and 240 are provided with thick columnar trunk portions 231 and 241 every half octave or so. At the top of the rib wall 230, a convex arcuate rotation support portion 232 that rotatably supports the mass body 300 corresponding to each key is provided, and a convex ring or ring groove ( In FIG. 7, a concave groove 233) is formed.
[0041]
Further, the front support portion 220 is provided with a through hole 226 for each key, and switch fitting ribs 227 and 228 are provided on the lower surface of the front and rear portions of the through hole 226 so as to fit between the ribs. A glasses-like key switch sw is disposed in the recess 229, and a switch substrate 400 secured by a part of the rib 227 is disposed. A mass body guide protrusion 221 protrudes further on the upper surface of the support part 220 and further on the front wall 224 with the reinforcing part 24a and a stopper receiving part 223 at the time of over-pressing the key. (For white key) is formed. The guide protrusion 211 is formed at the same position in the longitudinal direction of the black and white key. The guide protrusion 211 in FIG. 7 depicts a white key, but it is also shown at the same position in FIG. The reason why such a configuration is possible is that a driving piece 124 and a rubber-like elastic piece 127 (described later) which are key mass body driving parts, a force transmission part 320 receiving the same, and tips 323 and 327 (described later) thereof. This is because the black-and-white key can be set to almost the same position. That is, the driving piece (not shown) of the black key 100B is provided in a boot shape under the adjacent two white keys, and the rubber-like elastic piece is fixed to the toe portion of the boot, thereby transmitting the force. What is necessary is just to drive the front-end | tip of the part 320. FIG. Precisely, the position of the rubber elastic piece for the black key is set slightly closer to the front side (key free end side) than that of the white key (127) so that the guide protrusion 221 can be in the same position as the black and white key. . This means that a black and white key has the same touch feeling when the key performance operation unit is pressed. Note that 23a is a white key felt, and the felt 218 is a receiving member when the black key 100B is over-pressed, and both the felts 23a and 218 do not come into contact with the key at about fortissimo.
[0042]
A receiving portion 250 that restricts the upper limit movement of the mass body is formed on the upper surface of the rear portion of the horizontal main portion 210, and a mass body stopper felt 251 is fixed to the lower surface of the horizontal main portion 210 so as to cross the upper surface of the shelf plate 20 or the rib wall 240. A lower limit stopper felt 242 of the mass body is disposed below the wall 240 as a retrofit. The felt 242 is disposed as shown in the figure after the mass body 300 is inserted into the support member and then fixed to the lid member ld continuously provided through the hinge portion hg provided at the lower end of the rib wall 240. The
[0043]
The mass body 300 is disposed in a space formed by the horizontal main portion 210 and the shelf board 20 in a seesaw configuration with one-point support via the rotation support portion 232 at the top of the vertical rib wall. The mass body 300 includes an iron bar-shaped metal portion 350 and a resin processing portion 310 in which a part thereof is embedded in resin by outsert molding. The resin processing portion 310 includes a force transmission portion 320 and a metal support portion. 340 and a rotation fulcrum part 311. The rotation fulcrum part 311 is disposed at a branch point obtained by dividing the mass body 300 into 1: 3 to 1: 4, and is fitted to the rotation support part 232 so as to freely rotate. At the time of fitting, the arc-shaped convex 312 is fitted in the groove 233 so as to be freely slidable and regulates rocking and rattling in the key arrangement direction.
[0044]
The force transmission unit 320 is a multi-functional member, and has a function of literally transmitting a force from the key to the mass body. The mass body smoothly moves when the mass body 300 is inserted into and removed from the support member (support portion 232). In addition to having an inserted / removed guide function for insertion / removal operation, it has an operated guide function that restricts the rocking of the keys and / or the mass body in the direction of alignment during key operation after insertion / removal. Yes. Further, it has a key pressing sensor driving function, a pressed contact function in which the mass body is pressed against the fulcrum, and a part of the mass body falling-off preventing function during key operation.
[0045]
The force transmission unit 320 has side walls 321 and 325, and the end portion 322 and the end portion 326 form a piece for preventing separation between the key and the mass body when the key is returned, and the end portions 323 and 327 are used for pressing the key. The force receiving part is configured. In addition, guided inner pieces 324 and 328 of the end portions 323 and 327 constitute guided pieces that perform the operated guide function. As shown in FIG. 7, the tip inner side walls 324 and 328 as the guided pieces are formed in an eight-letter shape that widens toward the tip direction (left side in FIG. 7), or the tip (upper) of the guide protrusion 221 is By forming it thinner than others in the key width direction, it is possible to facilitate the fitting of the mass body to the support member at the final stage of insertion. And it has the recessed part 329 between the edge parts 322 and 326, and the edge parts 323 and 327, and was press-fitted in the through-hole 126 of the lower surface 125 of the mass body drive piece 124 formed in the lower surface of the key front part 120. A rubber-like elastic piece 127 is sandwiched between the recesses 329 so that the surface of the elastic body 127 and the recesses 329 can be slid when the key is pressed, thereby transmitting the force from the key 100 to the mass body 300. That is, when the elastic piece 127 shown in the figure is fitted into the through-hole 126 when the driving piece 124 of FIG. 8 is rotated about 90 degrees in the x direction by the groove g, the key 100 and the mass body 300 in FIG. A fitting state is obtained.
[0046]
The force transmission unit 320 connects the side walls 321 and 325, and forms a groove bottom 331 that is also a guided piece when the mass body 300 is inserted into the support unit 232 at the bottom between the side walls 321 and 325. The inner side of 321 and 325 and the groove bottom portion 331 constitute an insertion / removal guided groove 330. Further, a switch drive piece 334 is integrally formed on the lower surface of the groove bottom portion 331, and the switches sw are sequentially turned on when the keys are depressed. The tip of the groove 330 is formed by an inclined surface 332, and when the mass body tip is inserted from the lower side of FIG. 7, the elastic guide piece when the mass body is inserted and inserted integrally formed in front of the horizontal main portion 210. 211 A gap between the distal end bent portion 212 and the support portion 232 is formed in advance as indicated by a solid line in the guide piece 211, and easily expands like a dotted line by press-fitting from the mass body groove bottom portion 331 slope 332. It is configured as follows. In addition, the elasticity (spring property) of the elastic guide piece can be further improved by forming a downward convex U-shaped or U-shaped elastic guide piece 211a as shown in FIG. And in the rear part of the groove bottom part 331, a depression part 333 of the bent part 212 is formed so as to form a stable state when the rotation fulcrum part 311 is fitted to the rotation support part 232.
[0047]
The mass body interlocked with the key rotates in a state in which the bent portion 212 is fitted to the depressed portion 333. However, when the mass body is detached from the support member during maintenance and inspection, the groove bottom portion 331 of the bent portion 212 is used. Since the guide piece 211 which is the holding portion has elasticity, the abutting portion with respect to the rib is removed from the support member and the surface opposite to the rib wall 230 of the mass body resin processing portion 310 is a rib. When the mass body 300 is rotated to such an extent that it is about to come into contact with the wall 230, the bent portion 212 is slightly escaped from the falling portion 333, and the mass body 300 can be easily pulled out by simply pulling the mass body 300 obliquely downward. You can leave.
[0048]
The elastic guide piece 211 fits into the guided groove 330 when the mass body is inserted into and removed from the support member, guides both side walls 321, 325, and in mass body rotation during key operation, The rear side of both side walls 321 and 325 is always guided. At this time, the front end of the mass body is guided by guide protrusions 221 whose end inner walls 324 and 328 protrude from the support member. As a result, the mass body 300 can surely move up and down without wobbling, and the key coupled so as to be slidable and rotatable at the front end of the mass body can also move up and down without wobbling. With such a mechanism, the key guide pieces seen in both UPS can be eliminated as shown by the solid line in FIG. Even if there is no key guide piece protruding from the support member, the keys are not displaced in the arrangement direction by the glissando playing method, and smooth vertical movement is possible.
[0049]
However, in FIG. 7, the key guide when viewed from the key is actually a mass body guide, so that it is positioned below the key, and the guide becomes rough. Therefore, a fulcrum structure such as JP-A-6-149229 that discloses a keyboard that prohibits only the rolling direction when viewed from the front of the key at the key fulcrum so that the key may be allowed to move slightly within the inter-key width. It is better to use. Further, in order to ensure the reliability of the key guide, as shown by the dotted line in FIG. 7, the projection 221 that is a mass body guide piece may be used as an operation guide piece that also serves as a key and mass body that extends upward as it is. In addition, the hole 213 of FIG. 8 is a hole for enabling a metal leaf spring to be retrofitted in the event that the guide piece is broken during maintenance inspection. Moreover, the metal support part 340 is a thin wall except the part which makes a rib part and metal support.
[0050]
The key 100 has a characteristic configuration not shown in the first and second embodiments, and a rotation support portion 112 is provided on a rotation fulcrum portion 112 provided on the key rear wall 110r opposite to the front surface 123 of the key. 222 is urged backward by the first elastic piece 113. In the previous embodiment, the key is urged forward, but it can be urged backward. The corresponding part of FIG. 7 is shown corresponding to the dd cross section of FIG. 3A, and the protruding guide piece protruding from the support member (number 24 in FIG. 3C) is The illustration is omitted. The first elastic piece 113 is a piece having a vertical cross-section formed by an upper piece 13a and a lower piece 13b, and a reinforcing rib wall 116 is cut out immediately in front of the key rear wall 110r to lower the key rear end lower part 111. It is extended to. It is arranged side by side (in parallel with the elastic piece 113 in the key width direction within the key width), an irregular pentagonal second elastic piece having a hinge is provided on the upper part, and the upper part has a hinge structure. Thus, the lower part of the second elastic piece is displaceable in the key width direction. Then, a protrusion 114p is provided on the side of the second elastic piece so as to face the first elastic piece 113 and always protrude and fit into the rectangular recess n, and to the through hole 21 when the key 100 is inserted into the support member 200. A protrusion 114p is provided so as to temporarily escape from the rectangular recess when the lower part of the rear end of the key is inserted.
[0051]
In addition, the protruding piece for automatically causing the second elastic piece displacement at the time of key insertion is erected in the vicinity of the front edge of the through hole 21 of the horizontal main portion 210 with substantially the same configuration as in FIG. At the initial time, the lower piece 13b abuts on the front edge, and immediately before or simultaneously with the displacement of the first elastic piece 113 in the key rear end direction, the projecting piece lowers one side of the second elastic piece. Is pressed, and the second elastic piece is displaced in the key width direction. The protrusion 114p is fitted into the square-shaped recess n when the key is rotated and not rotated after the key is inserted.
[0052]
Then, as a method for removing the key from the support member 200, a jig (minus driver) insertion through-hole 115 is provided on the key surface, and the jig is inserted from here to be provided in the laterally displaceable portion of the second elastic piece. The protrusion 114p is laterally displaced, and the rear is lifted while pulling the key toward the front. When the key is inserted, the elastic pieces operate in substantially the same manner as in the previous embodiment except that the directions of the elastic pieces are opposite. Since the operation panel 260 is disposed above the through-hole 115, there is no problem in terms of appearance.
[0053]
In this embodiment, the upper side 13a of the first elastic piece 113 presses the sliding portion 21s provided on the front edge of the through hole 21 from diagonally downward to diagonally upward, and the rotational torque around the key rotation center is counterclockwise. Although it is rotating, a key returning force is generated by the weight of the mass body, and since this returning force is larger than the rotational torque, the key may be positioned upward (solid line state) when the key is not pressed. it can. When the key is pressed, the state is indicated by a two-dot chain line.
In this embodiment, the method of pressing the key rearward can smoothly incorporate the key and the mass body into the support member. Further, a negative key restoring force is generated by the action of the first elastic piece 113, and the mass body is always pressed downward at a force transmission point (a portion of the rubber-like elastic body 127) when the key is not pressed. Therefore, there is also an advantage that force transmission from the key to the mass body is performed quickly at the initial stage of key depression. If this is done as in the previous embodiment, it may cause a slight clearance at the initial stage of key depression, and may not be suitable for fast play, for example.
In order to generate the “negative” key restoring force and to make the restoring force difficult to change semi-permanently, the configuration of the second embodiment (FIG. 6) is changed to the third embodiment (FIGS. 7 and 8). You may apply. In this case, the first elastic piece 33 and the rotation fulcrum portion 12 may be reversed left and right as shown in FIG.
[0054]
Further, in this embodiment, the elastic body of the elastic guide piece 211 itself with respect to the mass body presses the mass body in the fulcrum direction (rotation center direction), and the guide piece 211 is inclined to the groove bottom portion 331 in the mass body insertion state. Since 335 is biased downward, a clockwise restoring force is applied to the mass body 300 in FIGS. This improves the return of the mass body from the key-pressed state in particular, so that it is possible to improve the speed of playing, etc. together with the negative return force by the first elastic piece 113 of the key.
[0055]
In addition, in order to impart the above-mentioned favorable fast-playing effect semi-permanently with durability, as shown in the fourth embodiment of FIG. 10, instead of the guide piece 211, a common base common to one octave or several octaves is used. The front end of the horizontal main portion 210 of the supporting member is formed by a comb-like metal leaf spring (guide piece when inserting a mass body) 216, 216, which is provided with a common attachment portion 215 consisting of ends, and is formed by screws 217 or the like. You may make it integrate in a part.
In the fourth embodiment, the same or substantially the same parts as those in the third embodiment are denoted by the same reference numerals and the details thereof are omitted. In this embodiment, in addition to the above-described features, there are features that are not found in the previous embodiment. . That is, the guide pieces 216, 216, ... when the mass body is inserted are formed to extend toward the guide portion (guide protrusion 221) at the time of operation. As a result, the guide function at the time of inserting the mass body is further enhanced, and by simply pushing the mass body in the direction of the arrow a3, the guide end of the end inner wall 324, 328 which is the guided portion at the time of operation is guided. 221 can be led. Moreover, since the guide piece 216 has a U-shape, it has a high elasticity and has a function of pressing and / or returning the mass body to the rotation support portion semi-permanently with durability.
[0056]
In both the above embodiments, the elastic guide piece 211 (216) guides the C-shaped portions of the walls 324 and 328 in the first stage regarding the insertion of the mass body 300 into the support member 200. Then, in the second stage in which the mass body 300 is inserted to the left while turning counterclockwise, the tip bent portion 212 climbs the inclined surface 332, passes through the groove bottom portion 331 of the insertion / removal guided groove 330, and enters the drop portion 333. The elastic guide piece 211 (216) leads (guides) the mass body 300 until just before dropping. Thereafter, the elastic guide piece 211 (216) and the guide protrusion 221 cooperate in the third stage in which the C-shaped portion is put on the upper portion of the guide protrusion 221 and the rotation fulcrum 331 is fitted to the rotation support section 232. Then, the mass body 300 is guided. That is, the C-shaped part is guided by the guide protrusion 221, the wall 324 and the wall 328 are positioned on both sides of the guide protrusion 221, and the rotation fulcrum part 311 is located on the mass body rotation support part 232. The concave groove 233 and the arcuate convex 312 are engaged while being engaged.
[0057]
Further, when the mass body is rotated after the mass body 300 is inserted into the support member 200, the circular arc convex shape 312 is guided by the concave groove 233, and the elastic guide piece 211 farther than this guides the insertion / removal guided groove 330. The mass body rotation is reliably guided by the triple guide mechanism that the walls 324 and 328 are guided by the guide protrusion 221 while the side walls 321 and 325 are guided.
[0058]
In particular, in the procedure for assembling the mass body into the support member, a mechanism that is reliably guided from the initial stage of insertion to the end of insertion in the above three-step process is adopted, so that the support member is fixed on the base (see FIG. 7). With the shelf board 20 removed), the mass body 300 can be inserted from below by the robot arm, and then the key 100 can be held by the arm and the key 100 can be inserted from the upper left to the lower right. . That is, the automatic incorporation of the key and the mass body into the support member 200 can be performed by simple sequence control by the robot arm.
[0059]
Next, a fifth embodiment will be described with reference to FIG. FIG. 11 shows an embodiment in which the rotating member is a mass body and the elastic piece is provided on the mass body side (rotating member side). The members with the same numbers as the previous example in this figure represent the same or substantially the same members, and will not be described in detail. As shown in the end view on the left side of the drawing, the force transmission portion 320a of this embodiment is configured with a single blade (two blades in FIG. 8), and there is a fulcrum portion (rotating fulcrum portion) on the mass body side. 311) The elastic piece 337 is integrally formed in the vicinity. In this embodiment, when the mass body 300 is inserted into the mass body rotation support portion 232 (when it is about to be inserted), and when the key is not pressed and when the key is pressed, the rotation member side (in the mass resin processing portion 310). Due to the elasticity of the elastic piece 337 provided in the force transmission part 320 a), the rotation fulcrum part 311 of the mass body 300 is brought into contact with the rotation support part 232 so as to be always pressed. In this case, when the mass body is not inserted into the support member, the elastic piece 337 releases its elasticity as indicated by a dotted line. However, in the inserted state, the outer circular arc surface (insertion) of the elastic piece 337 is inserted. The arcuate centered on the center of rotation when worn) is configured to press against the valley 214 of the comb-like partition 218.
[0060]
In this embodiment, the insertion guide of the mass body to the support member is performed by the two facing surfaces of the partition portions 218 and 218, and as a guide before the insertion dimension and an operation guide after the insertion, the force of a single blade is used. This is done by guiding the end (not shown) of the transmission part 320a with a two-fork guide protrusion (not shown but corresponding to 211). The guide protrusion may be formed by one protrusion common to each of the adjacent keys.
[0061]
7 to 11 described above, it is desirable to apply a lubricant such as grease to the contact portion of the elastic piece 337 or the guide piece 211. Regardless of whether or not it is applied, a frictional feeling is generated by the movement of the mass body, but in the case where grease is applied to the trough portion 214 in FIG. Is obtained. Even if the lubricant is applied to the key rotation fulcrum, this friction feeling effect is further increased. This feeling of friction needs to be such that the return of the key does not worsen. As is well known, the dynamics of friction has a relationship of static friction> dynamic friction, and a touch is applied at the beginning of the key press, and then becomes a little lighter. In particular, a normal touch feeling of Pianissimo or higher can provide a dynamic touch feeling due to mass movement.
[0062]
Furthermore, since the above-described mass body guide mechanism is provided in the above-described embodiments of FIGS. 7 to 11, the clearance between adjacent mass body facing surfaces (in FIG. 11, below the mass resin processing portion 310). Can be set to a minimum (for example, 1 mm, theoretically close to zero) except for the position where the rib wall 240 exists. In other words, since the clearance can be minimized, a space in the key arrangement direction can be afforded accordingly, and a plurality of rib walls 240 can be provided in the space where the allowance is obtained. And since the some rib wall 240 could be provided, a support member can be comprised firmly. The support member that must support the key and the mass body in a freely rotatable manner can be robustly constructed without using a heavy, tough and difficult-to-process material such as a metal plate such as an iron plate. The entire support member can be made of a resin member that is light and strong enough to operate the keyboard and is easy to process. Accordingly, it is possible to significantly reduce the cost of product manufacture in combination with the ease of mass body incorporation by the mass body guide mechanism and the ease of key assembly.
7 to 11, the key elastic piece 113 in FIG. 7 is replaced with the mass elastic piece 211 in FIG. 7 in order to realize a configuration in which the conventional key and mass body return spring is eliminated. It may be provided on the support member side.
Although the present invention has been described above, the keyboard device according to the present invention is applied not only to a keyboard device of an electronic musical instrument but also to a keyboard harmonica, a practice keyboard device, and the like.
[0063]
【The invention's effect】
As described above, according to the present invention, the rotation member such as the key and / or the mass body can be easily inserted into the support member, and after the insertion, the basic function (rotation) of the rotation member is facilitated. It is possible to maintain the urging of the moving member to the support member or the prevention of the rotation member from falling off the support member). By maintaining the basic function, it is possible to perform a semi-permanently stable performance operation.
[Brief description of the drawings]
FIG. 1 is an overall view of a keyboard apparatus showing a first embodiment of the present invention as a partial side sectional view.
FIG. 2 is a partial perspective view of the rear portion of the key of the first embodiment when viewed from the rear upper side.
FIG. 3 is a detailed view depicting the vicinity of a key fulcrum in the first embodiment.
FIG. 4 is a transition diagram of the insertion state of the key into the support member in the first embodiment.
FIG. 5 is an overall view of the keyboard device showing the second embodiment as a partial side sectional view.
FIG. 6 is a view at the time of key depression showing the key rear portion of the second embodiment as a side sectional view.
FIG. 7 is an overall view of the keyboard device showing the third embodiment as a side sectional view.
FIG. 8 is a main part exploded perspective view showing a fitting structure between a mass body and a support member and a fitting structure between a mass body and a key in the third embodiment.
FIG. 9 is a modification of the elastic body for mass body pressing (urging) in the embodiment.
FIG. 10 is an exploded perspective view of a main part showing a fitting structure between a mass body and a support member and a fitting structure between a mass body and a key in the fourth embodiment.
FIG. 11 shows the fifth embodiment, in which the rotating member is a mass body, and the elastic piece is provided on the mass body side (rotating member side).
[Explanation of symbols]
1, 100 ... key (rotating member),
12 …… Key rotation fulcrum,
22... Rotation support part (key rotation support part on the support member side),
2, 200 ... support member,
13, 43, 113 ... elastic piece (first elastic piece),
14 ... the second elastic piece,
nn: Allowable space,
300 ... Mass body,
211 …… Elastic guide piece (elastic piece),
311: Rotating fulcrum (mass side fulcrum),
232 ...... Rotation support part (rotation support part for mass body on the support member side)

Claims (5)

回動部材と、この回動部材の回動支点部を回動支持部にて回動自在に支持する支持部材とを有する鍵盤装置において、
前記回動部材の取り付け時、前記回動支点部に先んじて前記回動支持部と当接する被ガイド面と、前記回動部材の取り付け時、前記支持部材に当接し、前記被ガイド面を前記回動支持部に押し当てる弾性片とが、前記回動部材と一体に形成され、
前記弾性片は、前記回動部材の回動支点部が前記支持部材の回動支持部に回動自在に支持された状態において、弾性により、前記回動部材の回動支点部を前記支持部材の回動支持部に常に押し付けるよう当接させることを特徴とする鍵盤装置。In a keyboard device having a rotation member and a support member that rotatably supports a rotation fulcrum portion of the rotation member by a rotation support portion.
When the rotating member is attached, the guided surface that comes into contact with the turning support portion prior to the turning fulcrum portion, and when the turning member is attached, the guided surface comes into contact with the supporting member, and the guided surface is An elastic piece pressed against the rotation support portion is formed integrally with the rotation member;
In the state where the rotation fulcrum portion of the rotation member is rotatably supported by the rotation support portion of the support member, the elastic piece causes the rotation fulcrum portion of the rotation member to be supported by the support member. A keyboard device, wherein the keyboard device is brought into contact with the rotary support portion so as to be always pressed. 押鍵操作により回動される鍵と、この鍵の回動支点部を回動支持部にて回動自在に支持する支持部材とを有する鍵盤装置において、
前記鍵と一体に形成された弾性片であり、前記鍵の後壁との間の許容空間を狭め又は広げる方向に弾性変形可能であり、前記鍵の取り付け時および前記鍵の回動支点部が回動支持部にて回動自在に支持された状態において、前記支持部材に当接して前記鍵の回動支点部を前記回動支持部に常に押し付ける第１弾性片と、
前記鍵と一体に形成された弾性片であって、前記第１弾性片と前記鍵の後壁との間の許容空間に対して挿抜可能な突起を有し、前記鍵の取り付け時、前記支持部材に当接して弾性変形して前記突起を前記弾性片と前記鍵の後壁との間の許容空間から抜き、前記鍵の取り付け後、前記突起を前記弾性片と前記鍵の後壁との間の許容空間に挿入する第２弾性片と
を設けたことを特徴とする鍵盤装置。In a keyboard device having a key rotated by a key pressing operation and a support member that rotatably supports a rotation fulcrum portion of the key by a rotation support portion.
An elastic piece formed integrally with the key, elastically deformable in a direction to narrow or widen a permissible space between the key and the rear wall of the key; A first elastic piece that abuts against the support member and constantly presses the rotation fulcrum portion of the key against the rotation support portion in a state of being rotatably supported by the rotation support portion;
An elastic piece integrally formed with the key, the protrusion having a protrusion that can be inserted into and removed from an allowable space between the first elastic piece and a rear wall of the key. Abutting on the member and elastically deforming, the protrusion is removed from an allowable space between the elastic piece and the rear wall of the key, and after the key is attached, the protrusion is formed between the elastic piece and the rear wall of the key. A keyboard device comprising: a second elastic piece that is inserted into an allowable space therebetween. 鍵の回動に連動して揺動する質量体と、前記質量体の回動支点部を質量体回動支持部にて回動自在に支持する支持部材とを有する鍵盤装置において、
前記支持部材と一体に設けられ、前記質量体回動支持部と対向する弾性片を有し、前記質量体の前記支持部材への取り付け時、前記質量体は前記弾性片と前記質量体回動支持部との間隙を通過し、前記質量体の回動支点部が質量体回動支持部にて回動自在に支持された状態において、当該弾性片の弾性により、前記質量体の回動支点部を前記質量体回動支持部に常に押し付けるよう当接させることを特徴とする鍵盤装置。In a keyboard apparatus having a mass body that swings in conjunction with the rotation of a key, and a support member that rotatably supports a rotation fulcrum portion of the mass body by a mass body rotation support portion.
An elastic piece provided integrally with the support member and facing the mass body rotation support portion. When the mass body is attached to the support member, the mass body rotates the elastic piece and the mass body. In a state where the rotation support point of the mass body is rotatably supported by the mass body rotation support unit through the gap with the support unit, the rotation of the mass body is supported by the elasticity of the elastic piece. A keyboard device, wherein the portion is brought into contact with the mass body rotation support portion so as to be always pressed. 鍵と、鍵の回動に連動して揺動する質量体と、前記鍵の回動支点部を鍵回動支持部にて回動自在に支持するとともに前記質量体の回動支点部を質量体回動支持部にて回動自在に支持する支持部材とを有する鍵盤装置において、
前記鍵の取り付け時、前記鍵の回動支点部に先んじて前記鍵回動支持部と当接する被ガイド面と、前記鍵の取り付け時、前記支持部材に当接し、前記被ガイド面を前記回動支持部に押し当てる鍵用弾性片とが、前記鍵と一体に形成され、
前記鍵用弾性片は、前記鍵の回動支点部が前記支持部材の鍵回動支持部に回動自在に支持された状態において、弾性により、前記鍵の回動支点部を前記支持部材の鍵回動支持部に常に押し付けるよう当接させるものであり、
前記支持部材は、前記支持部材と一体に設けられ、前記質量体回動支持部と対向する質量体用弾性片を有し、前記質量体の前記支持部材への取り付け時、前記質量体は前記質量体用弾性片と前記質量体回動支持部との間隙を通過し、前記質量体の回動支点部が質量体回動支持部にて回動自在に支持された状態において、弾性により、前記質量体の回動支点部を前記質量体回動支持部に常に押し付けるよう当接させることを特徴とする鍵盤装置。A key, a mass body that swings in conjunction with the rotation of the key, and a rotation fulcrum portion of the key that is rotatably supported by a key rotation support portion, and that the rotation fulcrum portion of the mass body is mass In a keyboard device having a support member rotatably supported by a body rotation support part,
When the key is attached, the guided surface that comes into contact with the key rotation support portion prior to the rotation fulcrum portion of the key, and when the key is attached, the guide member comes into contact with the support member, and the guided surface is brought into contact with the rotation surface. An elastic piece for a key to be pressed against the dynamic support portion is formed integrally with the key;
The elastic piece for the key is configured such that the rotation fulcrum portion of the key is elastically supported by the key rotation support portion of the support member. It is abutted to always press against the key rotation support part,
The support member is provided integrally with the support member, and includes a mass body elastic piece facing the mass body rotation support portion. When the mass body is attached to the support member, the mass body is Passing through the gap between the mass body elastic piece and the mass body rotation support portion, and in a state where the rotation fulcrum portion of the mass body is rotatably supported by the mass body rotation support portion, due to elasticity, A keyboard device, wherein the mass fulcrum fulcrum part is brought into contact with the mass body rotation support part so as to be always pressed. 鍵の回動に連動して揺動する質量体と、前記質量体の回動支点部を質量体回動支持部にて回動自在に支持する支持部材とを有する鍵盤装置において、In a keyboard apparatus having a mass body that swings in conjunction with the rotation of a key, and a support member that rotatably supports a rotation fulcrum portion of the mass body by a mass body rotation support portion.
前記支持部材と一体に設けられ、前記質量体回動支持部と対向する弾性片を有し、An elastic piece provided integrally with the support member and facing the mass body rotation support portion;
前記質量体の前記支持部材への取り付け時、前記質量体は、前記弾性片の弾性により前記質量体回動支持部に押し付けられ、前記質量体の前記支持部材への取り付け後は、前記質量体の回動支点部が質量体回動支持部にて回動自在に支持された状態となるものであり、When the mass body is attached to the support member, the mass body is pressed against the mass body rotation support portion by the elasticity of the elastic piece, and after the mass body is attached to the support member, the mass body Is a state in which the rotation fulcrum portion is rotatably supported by the mass body rotation support portion,
前記質量体には、前記質量体の回動支点部が質量体回動支持部にて回動自在に支持された状態において前記弾性片を受け入れる落ち込み部が形成されてなることを特徴とする鍵盤装置。The keyboard is characterized in that the mass body is formed with a depression portion for receiving the elastic piece in a state in which the rotation fulcrum portion of the mass body is rotatably supported by the mass body rotation support portion. apparatus.
JP17596796A 1996-06-13 1996-06-13 Keyboard device Expired - Fee Related JP3706953B2 (en)

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