JP3854815B2

JP3854815B2 - Mold

Info

Publication number: JP3854815B2
Application number: JP2001110502A
Authority: JP
Inventors: 尚登下村; 恵一高橋
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 2001-04-09
Filing date: 2001-04-09
Publication date: 2006-12-06
Anticipated expiration: 2021-04-09
Also published as: JP2002307496A

Description

【０００１】
【発明の属する技術分野】
本発明は、携帯電話、テレビ等の部品として使用される合成樹脂の成形品を製造するための成型金型の構造に関する。
【０００２】
【従来の技術】
従来の成型金型、及びこれを用いた成型品の製造方法の図面を説明すると、図１７は従来の成型金型の要部断面図、図１８、図１９は従来の成型品の製造方法を示した説明図である。
【０００３】
従来の成型金型及びこれを用いた成型品の製造方法を図１７〜図１９に基づいて説明すると、上部金型５０は、上下に貫通する複数の貫通孔５０ａと、下面に形成された第１の凹部５０ｂとを有する。また、下部金型５１は、リング状をなした第２の凹部５１ａと、この第２の凹部５１ａの一部に連通して外部に延びるように形成されたゲート５１ｂと、第２の凹部５１ａの底部から下方に延びて形成された細孔５１ｃとを有し、上部金型５０と下部金型５１とが合わされて、第１、第２の凹部５０ｂ、５１ａによってキャビティ５２が形成される。
【０００４】
抑えピン５３は、金属製からなる円柱であり、貫通孔５０ａ内に隙間なく、上下動可能に保持されている。イジェクトピン５５は、金属製の細棒からなり、細孔５１ｃ内に上下動可能に収納されている。
【０００５】
従来の成型金型は上記のような構成を有し、次にこの成型金型を用いた成型品の製造方法について説明すると、まず、金属製のフープ材からなり、複数の固定接点５４ａが形成された接点板５４を上部金型５０と下部金型５１との間のキャビティ５２内に配置して、この上部金型５０と下部金型５１を型締めする。この時、抑えピン５３によって固定接点５４ａを下部金型５１の表面に押しつける。その後、溶融されたポリエチレンテレフタレート（ＰＥＴ）等の熱可塑性の樹脂を、ゲート５１ｂからキャビティ５２内に射出、充填し、所定の時間その状態で放置して固化て、接点板５４を埋設した状態で、成型部材６０が成型される。
【０００６】
成型部材６０は、接点板５４が埋設された底壁部６０ａと、該底壁部６０ａから立設された側壁部６０ｂとを有し、側壁部６０ｂが第２の凹部５１ａ内に位置した状態で、キャビティ５２内で成型される。そして、上部金型５０を外し、イジェクトピン５５で側壁部６０ｂの頂部を押圧すると、成型部材６０が押し出されて成型品であるケースが製造される。
【０００７】
【発明が解決しようとする課題】
従来の成型金型は上記のような構成を有し、上記のような成型金型で成型品を製造した場合、イジェクトピン５５によって成型部材６０を押し出す際、成型部材６０の内壁面と下部金型５１との間に形成される空間部６１が密閉状態となっているので、イジェクトピン５５を相当の力で押し出す必要がある。この時、図１９に示すように側壁部６０ｂが強引に押圧されるため、底壁部６０ａが変形するという問題があった。このとき、底壁部６０ａをイジェクトピン５５で押圧することが考えられるが、接点板５４の形状が複雑であると、接点板５４を傷つけて接触不良が生ずる恐れがあり、また、固定接点５４ａを直接傷つける恐れもあり、採用できなかった。
【０００８】
本発明はかかる課題に対してなされたものであり、成型部材と下部金型との間の空間部を外部と連通させることによって、容易に成型部品を取り出せる成型金型を提供することを目的とする。
【０００９】
【課題を解決するための手段】
上記課題を解決するための第１の手段として、本発明の成型金型は、第１の金型と、該第１の金型に合わされると共に、この第１の金型との間にキャビティを形成する第２の金型と、前記キャビティ内へ射出された溶融樹脂が固化して形成される成型部材を押し出すイジェクトピンとを備え、前記第２の金型は、前記第１の金型を外した際に、前記成型部材を保持可能であり、前記第２の金型には、前記保持された成型部材を押し出す前記イジェクトピンが移動可能に収納されると共に、前記キャビティと外部を連通する連通孔が設けられ、前記成型部材は樹脂に埋設される接点板を有し、前記接点板には一方に膨出する膨出部を有する固定接点が設けられ、前記第２の金型は前記固定接点の接点面が押し付けられる支持部を有し、該支持部にその内側に位置する接点面と連通するように前記連通孔を形成して、型締め時において該固定接点が前記連通孔を塞ぐ位置に設けられる
構成とした。
【００１０】
また、第２の手段として、本発明の成型金型の前記第２の金型には、前記連通孔が分散して複数個設けられている構成とした。
【００１３】
また、第３の手段として、本発明の成型金型の前記第１の金型には、前記溶融樹脂を射出する際、前記接点板もしくは固定接点を押圧して、該押圧面と反対面を前記第２の金型側に押しつける抑えピンが移動可能に収納され、該抑えピンの径が前記連通孔の径よりも大きい構成とした。
【００１４】
また、第４の手段として、本発明の成型金型の前記成型部材は、前記接点板が埋設された底壁部と該底壁部と一体に設けられた側壁部とを有するケースを備え、前記側壁部は前記第２の金型に設けられた凹部内に保持可能であり、前記イジェクトピンは前記側壁部の頂部を押圧可能である構成とした。
【００２０】
【発明の実施の形態】
本発明の成型金型、及びこれを用いた成型品の製造方法の図面について説明すると、図１は本発明の成型金型によって製造された成型品が使用されている多方向入力装置の上面図、図２は図１の２−２線における断面図、図３は本発明の成型金型によって製造された成型品が使用されている多方向入力装置の分解斜視図、図４は本発明の成型金型によって製造された成型品が使用されている多方向入力装置に係る下ケースの下面図、図５は図４の５−５線における断面図、図６は本発明の成型金型によって製造された成型品が使用されている多方向入力装置に係る下ケースのスイッチの要部拡大断面図である。
【００２１】
また、図７は本発明の成型金型によって製造された成型品が使用されている多方向入力装置に係る操作部材の要部断面図、図８は本発明の成型金型によって製造された成型品が使用されている多方向入力装置に係る各部材が埋設された支持部材の下面図、図９は図８の９−９線における断面図、図１０、図１１は、本発明の成型金型によって製造された成型品が使用されている多方向入力装置の動作説明図、図１２は本発明の成型金型の第１の実施の形態における要部断面図、図１３、図１４は本発明の成型品の製造方法の第１の参考例を示した説明図である。
【００２２】
本発明の成型金型の第１の実施の形態によって製造される成型品は、多方向入力装置の下ケース１として利用され、まずはこの多方向入力装置について説明する。
下ケース１は、図３〜図５に示すように、８角形状の平板からなる底壁部２と、底壁部２の外周側縁から立設された側壁部３とを有し、底壁部２は、中央に形成された上下に貫通し、同一円周上に配設された扇状の４個の第１の孔２ａと、これ等の第１の孔２ａ間に位置して十字状に形成されている受け部２ｂと、第１の孔２ａを挟むような位置に形成されている一対の第２の孔２ｃとを有している。また、底壁部２は、図３に示すように、上面に互いに対向するように４箇所に設けられた突起２ｄを有し、また、図４、図５に示すように、下面の外縁に対向するように設けられた複数の凹部２ｅを有している。
【００２３】
側壁部３は、中央に突出する突出部３ｃが形成された第１の側壁部３ａと、第１の側壁部３ａに隣り合う第２の側壁部３ｂとで構成されており、この第１、第２の側壁部３ａ、３ｂが交互に円周上に配設されて１つの８角形状の側壁部３が形成されている。
【００２４】
金属板からなる第２の固定接点４は、丸形状の接点部４ａと、該接点部４ａから外方に延びる端子部４ｂとを有しており、接点部４ａは第１の孔２ａの上方を塞いだ状態で底壁部２の表面に露出し、端子部４ｂは外方に向かって埋設された後裏面に露出し、再び埋設されて側面に突出し、先端が折り曲げられて凹部２ｅに収納されている。このように埋設された第２の固定接点４の接点部４ａの背面には、中央部を通って十字状横切るように受け部２ｂが位置し、接点部４ａの背面はこの受け部２ｂによって支持された状態となっている。
【００２５】
金属板からなるコモン接点５は、弓状をなす基部５ａと、基部５ａの両端の先端に位置する長方形状の接点部５ｂと、基部５ａの一部から外方に延びる端子部５ｃとを有している。そして、接点部５が一対の第２の孔２ｃの上方を塞いだ状態で底壁部２の表面に露出すると共に、基部５ａが接点部４ａを囲んだ状態で底壁部２の表面に露出し、端子部５ｃの先端が折り曲げられて凹部２ｅに収納された状態で、このコモン接点５は底壁部２に埋設されている。
【００２６】
第２の可動接点６は、金属製のドーム状の板バネからなり、底壁部２の４個の突起２ｄにガイドされて、底壁部２の表面に載置される。第２の可動接点６が載置されると、この第２の可動接点６の外周縁がコモン接点５の接点部５ｂに常時接触し、頂部６ａが第２の固定接点４の接点部４ａと接離可能な状態となる。なお、この第２の可動接点６は、突起２ｄによって移動が規制されている。そして、この第２の可動接点６と第２の固定接点４、及びコモン接点５とでプッシュスイッチＳ１が形成されている
【００２７】
操作部材１０は、金属製の８角形状をなした薄板からなる第１の可動接点１１と、該第１の可動接点１１の中央部が埋設される合成樹脂からなるつまみ部１２とを有し、第１の可動接点１１には、つまみ部１２の外周を囲むように軸方向に上方に突出して、８角形をなす凸条からなる突起部１１ａと、外周に桟部を残してこの突起部１１ａから外方に向かって形成された逆三角形状をなす貫通孔である複数（８個）の逃げ部１１ｂと、桟部の外周部に形成されている凹部１１ｃと、下面の中央部に半球状に形成されている接触部１１ｄを有している。つまみ部１２は、略角柱状からなり、薄板状の基部１２ａと、該基部１２ａの中心から上方に延びて形成された先端が４角柱からなる柱部１２ｂとを有しており、第１の可動接点１１の中央部に形成された接触部１１ｄが基部１２ａに埋設されている。
【００２８】
そして、つまみ部１２に第１の可動接点１１が埋設されると、第１の可動接点１１はつまみ部１２の基部１２ａから外方に放射状に延びるように位置し、接触部１１ｄは基部１２ａの下面から下方に露出する状態となる。なお、図２に示すように、第１の可動接点１１と接触部１１ｄとの間には、複数の通孔１１ｅが形成されているが、この通孔１１ｅは、樹脂が充填されて、つまみ部１２の基部１２ａと柱部１２ｂとを繋ぐための連結部として機能するものである。
このような構成をなした操作部材１０は、第２の可動接点６が載置されている下ケース１内に傾倒可能に収納される。この時、第１の可動接点１１の凹部１１ｃ内に、第１の側壁部３の突出部３ｃが位置して、ガイドされて、第１の可動接点１１は下ケース１に収納されると共に、この凹部１１ｃと突出部３ｃのはめ合わせによって、操作部材１０の回転止めとしても機能する。また、操作部材１０が下ケース１に収納されると、第１可動接点１１の接触部１１ｄの外表面が、第２可動接点６に接触するので、球面同士の接触となり、操作部材１０がスムーズに傾倒するようになる。
【００２９】
４個の第１の固定接点１５はそれぞれ金属製からなり、図３、図８に示すように、略扇状をなす基部１５ａと、この基部１５ａから下方に折り曲げられて形成された端子部１５ｂとを有しており、また、当接部１６は、金属製の薄板からなり、中央に８角形状の通孔１６ａを有するリング状部１６ｂと、このリング状部１６ｂから４方に延びて形成されている脚部１６ｃとを有する。なお、当接部１６ｂは必ずしも金属からなる必要はなく、リジッドな合成樹脂から構成しても良い。
【００３０】
これら第１の固定接点１５及び当接部１６は、合成樹脂からなり、上ケースを形成する支持部材１７に埋設されて、支持部材１７に一体化されて固定される。支持部材１７は、合成樹脂の成型品からなり、図３、８，９に示すように、８角形状の薄板からなり、中央部に８矩形状の通孔１７ｄを有する基体１７ａと、基体１７ａの下面において下方に突出して形成されている三角形状の凸部１７ｂと、基体１７ａの外縁に形成され互いに対向するように位置する繋ぎ部１７ｃとを有する。
【００３１】
そして、第１の固定接点１５及び当接部１６は、支持部材１７に対して同一平面上に埋設されて一体化される。また、図８に示すように、第１の固定接点１５は、基体１７ａと凸部１７ｂとに挟まれて保持されると共に、隣り合う第１の固定接点１５同士は、繋ぎ部１７ｃによって一体化している。また、第１の固定接点１５より中央側に位置する当接部１６は、リング状部１６ｂが基体１７ａと凸部１７ｂとに挟まれた状態で保持されると共に、凸部１７ｂによって第１の固定接点１５と一体化し、通孔１６ａが支持部材１７の通孔１７ｄと連通した状態となっている。
【００３２】
このような構成をした、第１の固定接点１５及び当接部１６が埋設されている支持部材１７は、上ケースとして下ケース１の開放部を覆うように固定され、上ケースたる支持部材１７と、下ケース１とでケーシング７が構成される。この時、図２に示すように、第１の固定接点１５の端子部１５ｂが、内方に折り曲げられて底壁部２の凹部２ｅ内に係合し、固定が確実となる。また、操作部材１０のつまみ部１２は、当接部１６の通孔１６ａから突出した状態となる。
【００３３】
支持部材１７が下ケース１に固定されると、図２に示すように、操作部材１０は第２の可動接点６の付勢力によって、突起部１１ａが当接部１６の下面に圧接する状態となる。この突起部１１ａが当接部１６の背面に当接して位置決めされることにより、第１可動接点１１が第１の固定接点１５に対して離間している。そして、第１可動接点１１と第１の固定接点１５とで、傾倒スイッチＳ２を構成し、通常時ＯＦＦ状態となっており、省電力化を図ることができる。
【００３４】
そして、操作部材１０は、図１０を参照するに、突起部１１ａと当接部１６との当接点を第１の支点Ａとして傾倒可能であり、操作部材１０が傾倒すると、第１の固定接点１５と第１の可動接点１１とが接触し、第１の固定接点１５とコモン接点５とが、第１の可動接点１１と第２の可動接点６を介して導通して、ＯＮされ、第１の電気信号たる方位検出信号を出力する。即ち、第１の固定接点１５の端子部１５ｂとコモン接点５間がＯＮとなり、方位検出信号が出力されるようになっている。
【００３５】
さらに、操作部材１０を同一方向に傾けると、図１１を参照するに、操作部材１０は、第１の固定接点１５と第１の可動接点１１との接触点を第２の支点Ｂとして傾倒する。すると、接触部１１ｄが下方に移動することにより第２の可動接点６を押圧して、この第２の可動接点６が反転し、頂部６ａが第２の固定接点４の接点部４ａと接触する。そして、コモン接点５と第２の固定接点４とが導通してＯＮとなり、第２の電気信号たる確定信号を出力する。なお、第１の可動接点１１の逃げ部１１ｂに、凸部１７ｂが出入り可能となっているので、薄型化が可能で操作部材１０の傾倒がスムーズに行われると共に、傾倒のガイドにもなっている。また、
【００３６】
カバー部材２０は、金属製からなり、中央に円形の通孔２０ａが形成されている基板２０ｂと、基板２０ｂの対向する２辺から下方に折り曲げられて形成されている脚部２０ｃとを有する。このような形状をしたカバー部材２０は、支持部材１７の表面を覆うと共に、脚部２０ｃが内方に折り曲げられて底壁部２の凹部２ｅ内に係合し、カバー部材２０の固定が確実となる。このカバー部材２０は、電気シールドとしての機能を有し、端子部２０が図示せぬ配線基板に形成されたグランドパターン等に接続されて、外部から静電気等がグランドパターンに流れるようになっており、より確実な検出を可能とするものである。
【００３７】
本発明のプッシュスイッチが使用される多方向入力装置は、上記の様な構成を有するが、次にその動作について図１０、図１１に基づいて説明すると、操作部材１０が、十字状の位置に配設された第１の固定接点１５の内の１つの方向に傾倒されると、操作部材１０は第１の支点Ａを支点として傾倒し、第１の可動部材１１と、第１の固定接点１５とが接触して、第１の電気信号たる方位検出信号が、図示せぬ配線基板に配置されているマイコンに入力される。さらに、操作部材１０が傾倒されると、操作部材１０は第２の支点Ｂを支点として傾倒し、接触部１１ｄによって第２の可動接点６が下方に押圧されて、第２の固定接点４と接触する。そして、第２の固定接点４と第２の可動接点６とが接触すると、第２の電気信号たる確定信号が図示せぬ前記マイコンに入力されて、該マイコンから傾倒方位が確定した信号（方位確定信号）が、外部の電気機器に出力される。この時、操作者は、第２の可動接点６が反転したことにより、クリック感が得られるので、確実に方位確定信号が出力されたことを認識できるようになっている。
【００３８】
次に、操作部材１０への押圧力が解除されると、第２の可動部材６が復帰することによって、この付勢力によって接触部１１ｄが上方に押圧されて、突起部１１ａが当接部１６に当接することによって、操作部材１０が中立位置に自動的に復帰して、図２の状態に戻る。操作部材１０が中立位置に復帰すると、第２の固定接点４と第２の可動接点６とが離間するのはもとより、第１の固定接点１５と第１の可動接点１１とが離間するので、両方のスイッチＳ１、Ｓ２がＯＦＦ状態となり、小電力化に資する。
【００３９】
また、操作部材１０は８方向に移動可能であるので、十字状の位置に配設された第１の固定接点１５の隣り合う方向（斜め方向）に操作部材１０が傾倒した時は、２個の第１の固定接点１５と、第２の可動接点１１とが接触して、マイコンに第１の電気信号が入力され、マイコンが斜め方向に傾倒したことを認識するようになっている。そして、この状態で操作部材１０が更に傾倒されると、前述と同様に、プッシュスイッチＳ１が操作されて確定信号がマイコンに入力される。
【００４０】
なお、操作部材１０が第１の支点Ａを支点として傾倒している時に、傾倒動作に代えて、該操作部材１０を軸方向に押圧動作して、第２の固定接点４と第２の可動接点６とをＯＮにしても良い。
【００４１】
さらに、中立状態で操作部材１０を軸方向に押圧すると、第１の固定接点１５と第１の可動接点１１とが離間した状態、即ち傾倒スイッチＳ２がＯＦＦ状態で、第２の固定接点４と第２の可動接点６とが接触してプッシュスイッチＳ１がＯＮ状態となり、マイコンに第２の電気信号のみが入力されるようになっている。この場合、マイコンは、独立のプッシュスイッチＳ１からの信号を外部の電気機器に出力するようになっている。
【００４２】
このように操作部材１０が傾倒、押圧されることによって、第２の可動部材６が繰り返し反転して頂部６ａが第２の固定接点４の接点部４ａと接触し、該接点部４ａに下方への押圧力が度々加わるが、接点部４ａは十字状の受け部２ｂによって支持されているので、接点部４ａが変形することがなく、頂部６ａとのスイッチングが常時良好な状態で確実に保たれる。
【００４３】
本発明の成型金型によって製造される成型品は、上記に説明した多方向入力装置を構成するスイッチ部品である下ケース１に用いられており、次に本発明の成型金型、及びこれを使用した成型品である下ケース１の製造方法について説明する。
【００４４】
第１の金型たる上部金型２５は、上下に貫通する第１の貫通孔２５ａと、該第１の貫通孔２５ａを挟むように形成されている一対の第２の貫通孔２５ｂと、下面に形成された８角形状の底浅の第１の凹部２５ｃとを有し、第２の金型たる下部金型２６は８角形状のリング状をなした第２の凹部２６ａと、この第２の凹部２６ａの一部に連通して外部に延びるように形成されたゲート２６ｂと、上下に貫通する複数形成された連通孔２６ｃと、第２の凹部２６ａと連通して下方に延びて形成された細孔２６ｄとを有し、この上部金型２５と下部金型２６とが組み合わされて、第１、第２の凹部２５ｃ、２６ａによって、キャビティ２７が形成されている。そして、このキャビティ２７は、連通孔２６ｃによって外部に連通した状態となっている。
【００４５】
第１の抑えピン２８は、金属製からなる円柱であり、その先端に十字状の溝部２８ａが切り欠かれて形成され、このような構成の第１の抑えピン２８は、第１の貫通孔２５ａ内に隙間なく上下動可能に保持されている。第２の抑えピン２９は、金属製からなる円柱であり、第２の貫通孔２５ｂ内に隙間なく上下動可能に保持されている。これらの第１、第２の抑えピン２８、２９の径は、連通孔２６ｃの径よりも大きくなっている。イジェクトピン３１は、金属製の細棒からなり、細孔２６ｄ内に隙間なく上下動可能な状態で、その先端が第２の凹部２６ａと細孔２６ｄとの連結部を塞ぐ位置にある状態で保持されている。
【００４６】
本発明の成型金型は上記のような構成を有し、次にこの成型金型を用いた成型品の製造方法について説明すると、第２の固定接点４とコモン接点５とを有する金属製からなるフープ状の接点板３０を上部金型２５と、下部金型２６間のキャビティ２７内に配置して、この上部金型２５と下部金型２６を型締めする。この時、第２固定接点４とコモン接点５とが連通孔２６ｃの端部を塞ぐ状態になるように接点板３０を配置する。そして、上下に移動可能である第１の抑えピン２８の溝部２８ａが形成されている先端で、第２の固定接点４を押圧して、第２の固定接点４の押圧面と反対側の面を下部金型２６側に押しつけ、接点部４ａと下部金型２６との間に間隙ができないようにすると共に、溶融樹脂の湯圧により接点部４ａが移動しないようにしている。このとき、第２の固定接点４の押圧面と反対側にの中央に位置する接点面４ｃが連通孔２６ｃ内に露出するので、接点面４ｃが傷つく恐れが低減し、さらに第１の抑えピン２８の径が連通孔２６ｃの径よりも大きいので、第１の抑えピン２８が連通孔２６ｃ内に突入されることがなく、接点板３０が変形することなく支持を確実にできる。なお、押圧面側には十字状の溝部２８ａが位置するようになっている。
【００４７】
第１の抑えピン２８と同様に上下動可能である一対の第２の抑えピン２９も、第２のコモン接点５の接点部５ｂの押圧面を下部金型２６側に押しつけて、接点部５ｂが、溶融された樹脂の湯圧により移動しないように保持している。また、コモン接点５の接点面５ｄも、第２の固定接点４の接点面４ｃと同様に連通孔２６ｃ内に露出しており、更に、第２の抑えピン２９の径が連通孔２６ｃの径よりも大きいので、この第２の抑えピン２９が連通孔２６ｃ内に突入されることがなく、接点板３０が変形することなく支持を確実にできる。
【００４８】
その後、溶融されたポリエチレンテレフタレート（ＰＥＴ）等の熱可塑性の樹脂を、ゲート２６ｂからキャビティ２７内に射出、充填して、第２の固定接点４とコモン接点５が底壁部２に埋設されると共に、第２の凹部２６ａ内に充填された樹脂によって側壁部３が成型され、収納された状態で、成型部材３５が成型される。この時、第１の抑えピン２８には十字状の溝部２８ａが形成されているので、該溝部２８ａ内に溶融した樹脂が充填されて、十字状の受け部２ｂが、第２の固定接点４の接点部４ａを支持するように形成される。そして、所定の時間経過させて樹脂を固化させた後、下部金型２６が上部金型２５から移動させることにより、上部金型２５が成型部材３５から外れると、成型部材３５は、側壁部３が第２の凹部２６ａに保持された状態で、下部金型２６上に位置している。また、上部金型２５が外れることにより、第１の抑えピン２８が取り去られると４個の第１の孔２ａが接点部４ａの背面に形成され、第２の抑えピン２９が取り去られると、第２コモン接点５の接点部５ｂの背面から第２の孔２ｃが延びるように形成される。
【００４９】
その後、イジェクトピン３１によって、側壁部３の頂部３ｄを押圧して、成型部材３５を押し出すと、成型部材３５と下部金型２６の間に形成される空間部３６に連通孔２６ｃから空気が流入し、空間部３６の気圧が大気圧になるので、スムーズに成型部材３５が押し出されて、成型品たる下ケース１が製造される。なお、イジェクトピン３１を側壁部３の頂部３ｄに設けているのは、接点に樹脂が付着しないようにするためである。すなわち、イジェクトピン３１を接点形成面に当接するようにした場合、摩耗によって生ずる下部金型２６と細孔２６ｄと間に入り込んで、樹脂バリが発生するからである。
【００５０】
次に、図１５、図１６を用いて本発明の成型金型の参考例及びこれを用いた成型品の製造方法の第２の参考例を説明する。
【００５１】
図１５、１６に基づく本発明の成型金型の参考例、及びこの成型金型を用いた成型品の製造方法の第２の参考例は、第１の実施の形態及び参考例が、連通孔２６ｃを接点板３０で塞いでいることに対し、連通孔２６ｃが、接点４、５に面した位置に配置されておらず、成型時にキャビティ２７に直接連通して、連通孔２６ｃ内に塞ぎピン３７を挿入して、キャビティ２７内を密閉している。
【００５２】
次に、製造方法について説明すると、図１５に示すように、連通孔２６ｃに塞ぎピン３７を挿入して、キャビティ２７内を密閉状態とし、この状態で溶融樹脂をキャビティ２７内に射出、充填する。このとき、塞ぎピン３７が連通孔２６ｃを塞いでいるので、溶融樹脂がキャビティ２７から漏れることはない。そして、図１６に示すように、溶融樹脂の充填後に塞ぎピン３７を抜き、連通孔２６ｃをキャビティ２７と直接連通させ、イジェクトピン３１によって成型部材２５を押し出し、成型品たる下ケース１が製造される。本実施の形態では、連通孔２６ｃの位置を接点４、５に合わす必要がないので、仮に接点板３０の位置がずれたとしても、確実に成型部材３５を成型することができる。でその他の構成、製造方法については第１の実施の形態と同様なので、同一部材に同一番号を付してここでは説明を省略する。
【００５３】
本発明の成型金型は上記の構成をし、この金型を使用した製造方法は上記に説明したが、上記説明に限られないことは言うまでもなく、上部金型２５を第２の金型として連通孔を設け、下部金型２６を第１の金型としても良い。また、上部金型２５を可動金型としても良い。また、連通孔２６ｃは、上記実施の形態では複数個設けられていたが、１つであっても良い。また、連通孔２６ｃから圧縮空気を送り込んで、更に成型部材の取り出しを容易としても良い。なお、上記実施の形態では成型金型によって多方向入力装置を構成するスイッチ部品である下ケースが成型品として製造される例を説明したが、多方向入力装置に限られないことはいうまでもない。更に、接点板等の金属板を埋設しない、合成樹脂かならる成型品のみにも適用することができる。
【００５４】
【発明の効果】
本発明の成型金型の第２の金型には、キャビティと外部を連通する連通孔が設けられた構成をしているので、イジェクトピンによって成型部材を押し出す際に成型部材と金型の接触部分に空気が流入するので、成型部材を容易に取り出すことができ、成型部材の変形等の危険性が低減する。また、イジェクトピンを配置にも自由度を持たせることができる。
【００５５】
また、第２の金型に連通孔が分散して複数個設けられている構成としたため、空気がより流入しやすく、更に容易に成型部材を押し出して取り出すことができる。
【００５６】
また、接点板は連通孔を塞ぐ位置に設けられた構成としたため、連通孔に溶融樹脂が漏れる恐れがなく、所望の形状の成型品を得ることができる。また、接点板が傷つかないので、接触不良等の危険性が低減する。
【００５７】
また、固定接点は連通孔を塞ぐ位置に設けられた構成としたため、連通孔に溶融樹脂が漏れる恐れがなく、所望の形状の成型品を得ることができる。また、固定接点が傷つかないので、接触不良等の危険性が更に低減する。
【００５８】
また、抑えピンの径が連通孔の径よりも大きい構成としたため、接点板、もしくは固定接点を確実に第２の金型に押しつけることが可能なので、高品質の成型品を製造可能とすることができる。
【００５９】
また、イジェクトピンは成型部材であるケースの側壁部の頂部を押圧可能である構成としたため、接点板、及び固定接点から離れた位置において、成型部材を押し出すことができ、接点板、及び固定接点が傷つく危険性を回避することができる。
【図面の簡単な説明】
【図１】本発明の成型金型によって製造された成型品が使用されている多方向入力装置の上面図
【図２】図１の２−２線における断面図
【図３】本発明の成型金型によって製造された成型品が使用されている多方向入力装置の分解斜視図
【図４】本発明の成型金型によって製造された成型品が使用されている多方向入力装置に係る下ケースの下面図
【図５】図４の５−５線における断面図
【図６】本発明の成型金型によって製造された成型品が使用されている多方向入力装置に係る下ケースのスイッチの要部拡大断面図
【図７】本発明の成型金型によって製造された成型品が使用されている多方向入力装置に係る操作部材の要部断面図
【図８】本発明の成型金型によって製造された成型品が使用されている多方向入力装置に係る各部材が埋設された支持部材の下面図
【図９】図８の９−９線における断面図
【図１０】本発明の成型金型によって製造された成型品が使用されている多方向入力装置の動作説明図
【図１１】本発明の成型金型によって製造された成型品が使用されている多方向入力装置の動作説明図
【図１２】本発明の成型金型の第１の実施の形態における要部断面図
【図１３】本発明の成型金型の製造方法の第１の参考例を示した説明図
【図１４】本発明の成型金型の製造方法の第１の参考例を示した説明図
【図１５】本発明の成型金型の参考例、及び成型品の製造方法の第２の参考例を示す説明図
【図１６】本発明の成型金型の参考図、及び成型品の製造方法の第２の参考例を示す説明図
【図１７】従来の成型金型の要部断面図
【図１８】従来の成型品の製造方法を示した説明図
【図１９】従来の成型品の製造方法を示した説明図
【符号の説明】
１下ケース（スイッチ部品）
２底壁部
３側壁部
３ｄ頂部
４第２の固定接点
４ａ接点部
４ｃ接点面
５コモン接点
５ａ接点部
５ｄ接点面
６第２の可動接点
７ケーシング
１０操作部材
１１第１の可動接点
１２つまみ部
１５第１の固定接点
１６当接部
１７支持部材
２０カバー部材
２５上部金型
２５ａ第１の貫通孔
２５ｂ第２の貫通孔
２５ｃ第１の凹部
２６下部金型
２６ａ第２の凹部
２６ｂゲート
２６ｃ連通孔
２６ｄ細孔
２７キャビティ
２８第１の抑えピン
２８ａ溝部
２９第２の抑えピン
３０接点板
３１イジェクトピン
３５成型部材
３６空間部
３７塞ぎピン
Ｓ１プッシュスイッチ
Ｓ２傾倒スイッチ[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a molding die for producing a molded product of a synthetic resin used as a part of a mobile phone, a television or the like.Structure ofAbout.
[0002]
[Prior art]
The drawings of a conventional molding die and a method of manufacturing a molded product using the same will be described. FIG. 17 is a cross-sectional view of a main part of a conventional molding die, and FIGS. 18 and 19 show a conventional method of manufacturing a molded product. It is explanatory drawing shown.
[0003]
A conventional molding die and a method of manufacturing a molded product using the same will be described with reference to FIGS. 17 to 19. The upper die 50 includes a plurality of through holes 50 a penetrating vertically and a first die formed on the lower surface. 1 recess 50b. The lower mold 51 includes a ring-shaped second recess 51a, a gate 51b formed so as to communicate with a part of the second recess 51a and extending to the outside, and a second recess 51a. The upper mold 50 and the lower mold 51 are joined together to form a cavity 52 by the first and second recesses 50b and 51a.
[0004]
The holding pin 53 is a cylindrical column made of metal, and is held in the through hole 50a so as to be movable up and down without a gap. The eject pin 55 is made of a thin metal rod, and is housed in the pore 51c so as to be movable up and down.
[0005]
A conventional molding die has the above-described configuration. Next, a method of manufacturing a molded product using the molding die will be described. First, a metal hoop material is used to form a plurality of fixed contacts 54a. The contact plate 54 is disposed in the cavity 52 between the upper mold 50 and the lower mold 51, and the upper mold 50 and the lower mold 51 are clamped. At this time, the fixed contact 54 a is pressed against the surface of the lower mold 51 by the holding pin 53. Thereafter, a molten thermoplastic resin such as polyethylene terephthalate (PET) is injected and filled into the cavity 52 from the gate 51b, and left to solidify in that state for a predetermined time, with the contact plate 54 embedded. The molding member 60 is molded.
[0006]
The molding member 60 has a bottom wall portion 60a in which the contact plate 54 is embedded, and a side wall portion 60b erected from the bottom wall portion 60a, and the side wall portion 60b is located in the second recess 51a. Thus, it is molded in the cavity 52. Then, when the upper mold 50 is removed and the top of the side wall 60b is pressed with the eject pin 55, the molded member 60 is pushed out to produce a case that is a molded product.
[0007]
[Problems to be solved by the invention]
The conventional molding die has the above-described configuration. When a molded product is manufactured using the molding die as described above, when the molding member 60 is pushed out by the eject pin 55, the inner wall surface and the lower die of the molding member 60 are used. Since the space portion 61 formed between the mold 51 and the mold 51 is hermetically sealed, it is necessary to push out the eject pin 55 with a considerable force. At this time, as shown in FIG. 19, the side wall portion 60b is forcibly pressed, so that the bottom wall portion 60a is deformed. At this time, it is conceivable to press the bottom wall portion 60a with the eject pin 55. However, if the shape of the contact plate 54 is complicated, the contact plate 54 may be damaged, resulting in poor contact, and the fixed contact 54a. Could not be adopted because there was a risk of directly hurting.
[0008]
  This invention is made | formed with respect to this subject, The molding metal which can take out a molded component easily by making the space part between a molding member and a lower mold | die communicate with the exterior.MoldThe purpose is to provide.
[0009]
[Means for Solving the Problems]
  As a first means for solving the above-described problem, the molding die of the present invention is fitted to the first die and the first die, and a cavity is formed between the first die and the first die. And an eject pin that pushes out a molding member formed by solidification of the molten resin injected into the cavity. The second mold includes the first mold. When the mold member is removed, the molding member can be held. In the second mold, the eject pin that pushes out the held molding member is movably accommodated, and the cavity communicates with the outside. A communication hole is provided.The molded member has a contact plate embedded in a resin, the contact plate is provided with a fixed contact having a bulging portion that bulges on one side, and the second mold has a contact surface of the fixed contact. The communication hole is formed so as to communicate with a contact surface located inside the support part, and the fixed contact is provided at a position for closing the communication hole at the time of mold clamping.
The configuration.
[0010]
Further, as a second means, the second mold of the molding die of the present invention has a configuration in which a plurality of the communication holes are provided in a dispersed manner.
[0013]
  The second3As the means, when the molten resin is injected into the first mold of the molding die of the present invention, the contact plate or the fixed contact is pressed, and the surface opposite to the pressing surface is set to the second mold. A holding pin that is pressed against the mold side is movably accommodated, and the diameter of the holding pin is larger than the diameter of the communication hole.
[0014]
  The second4As the means, the molding member of the molding die of the present invention includes a case having a bottom wall portion in which the contact plate is embedded and a side wall portion provided integrally with the bottom wall portion, and the side wall portion is It can be held in a recess provided in the second mold, and the eject pin can press the top of the side wall.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Referring to the drawings of the molding die of the present invention and the method of manufacturing a molded product using the same, FIG. 1 is a top view of a multidirectional input device in which the molded product manufactured by the molding die of the present invention is used. 2 is a cross-sectional view taken along line 2-2 of FIG. 1, FIG. 3 is an exploded perspective view of a multidirectional input device in which a molded product manufactured by the molding die of the present invention is used, and FIG. FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 4, and FIG. 6 is a cross-sectional view taken along line 5-5 of FIG. It is a principal part expanded sectional view of the switch of the lower case which concerns on the multidirectional input device in which the manufactured molded article is used.
[0021]
  FIG. 7 is a cross-sectional view of an essential part of an operation member according to a multidirectional input device in which a molded product manufactured by the molding die of the present invention is used, and FIG. 8 is a molding manufactured by the molding die of the present invention. FIG. 9 is a cross-sectional view taken along the line 9-9 in FIG. 8, and FIGS. 10 and 11 show the molding metal according to the present invention. FIG. 12 is a cross-sectional view of the main part of the first embodiment of the molding die of the present invention, and FIGS. 13 and 14 are drawings for explaining the operation of the multidirectional input device in which a molded product manufactured by the mold is used. 1st of the manufacturing method of the molded article of inventionReference exampleIt is explanatory drawing which showed.
[0022]
The molded product manufactured by the first embodiment of the molding die of the present invention is used as the lower case 1 of the multidirectional input device. First, the multidirectional input device will be described.
As shown in FIGS. 3 to 5, the lower case 1 has a bottom wall portion 2 made of an octagonal flat plate and a side wall portion 3 erected from the outer peripheral side edge of the bottom wall portion 2. The wall portion 2 penetrates vertically in the center and has four fan-shaped first holes 2a disposed on the same circumference and a cross between the first holes 2a. And a pair of second holes 2c formed at positions sandwiching the first hole 2a. Further, as shown in FIG. 3, the bottom wall portion 2 has protrusions 2d provided at four locations on the upper surface so as to face each other, and as shown in FIGS. 4 and 5, at the outer edge of the lower surface. It has a plurality of recesses 2e provided to face each other.
[0023]
The side wall portion 3 is composed of a first side wall portion 3a formed with a protruding portion 3c protruding in the center, and a second side wall portion 3b adjacent to the first side wall portion 3a. The second side wall portions 3a and 3b are alternately arranged on the circumference to form one octagonal side wall portion 3.
[0024]
The second fixed contact 4 made of a metal plate has a round contact portion 4a and a terminal portion 4b extending outward from the contact portion 4a. The contact portion 4a is located above the first hole 2a. Is exposed on the surface of the bottom wall 2 in a closed state, the terminal portion 4b is embedded outward and exposed on the back surface, is embedded again and protrudes to the side, and the tip is bent and stored in the recess 2e. Has been. A receiving portion 2b is positioned on the back surface of the contact portion 4a of the second fixed contact 4 embedded in this manner so as to cross the cross through the center portion, and the back surface of the contact portion 4a is supported by the receiving portion 2b. It has become a state.
[0025]
The common contact 5 made of a metal plate has an arcuate base 5a, a rectangular contact 5b positioned at the ends of both ends of the base 5a, and a terminal 5c extending outward from a part of the base 5a. is doing. The contact portion 5 is exposed on the surface of the bottom wall portion 2 with the upper portion of the pair of second holes 2c being closed, and the base portion 5a is exposed on the surface of the bottom wall portion 2 in a state of surrounding the contact portion 4a. The common contact 5 is embedded in the bottom wall 2 in a state where the tip of the terminal portion 5c is bent and accommodated in the recess 2e.
[0026]
The second movable contact 6 is made of a metal dome-shaped leaf spring, is guided by the four protrusions 2 d of the bottom wall 2, and is placed on the surface of the bottom wall 2. When the second movable contact 6 is placed, the outer peripheral edge of the second movable contact 6 is always in contact with the contact portion 5b of the common contact 5, and the top portion 6a is in contact with the contact portion 4a of the second fixed contact 4. It will be in a state where contact and separation are possible. The movement of the second movable contact 6 is restricted by the protrusion 2d. The second movable contact 6, the second fixed contact 4, and the common contact 5 form a push switch S1.
[0027]
The operation member 10 includes a first movable contact 11 made of a metal octagonal thin plate, and a knob portion 12 made of a synthetic resin in which a central portion of the first movable contact 11 is embedded. The first movable contact 11 protrudes upward in the axial direction so as to surround the outer periphery of the knob portion 12, and has a protrusion 11a formed of an octagonal protrusion, and this protrusion leaving a crosspiece on the outer periphery. A plurality of (eight) relief portions 11b which are through-holes having an inverted triangular shape formed outward from 11a, a recess 11c formed in the outer peripheral portion of the crosspiece, and a hemisphere in the center portion of the lower surface It has the contact part 11d currently formed in the shape. The knob portion 12 has a substantially prismatic shape, and includes a thin plate-like base portion 12a and a column portion 12b whose tip is formed by extending upward from the center of the base portion 12a. A contact portion 11d formed at the center of the movable contact 11 is embedded in the base portion 12a.
[0028]
Then, when the first movable contact 11 is embedded in the knob portion 12, the first movable contact 11 is positioned so as to extend radially outward from the base portion 12a of the knob portion 12, and the contact portion 11d is positioned on the base portion 12a. It will be in the state exposed downward from the lower surface. As shown in FIG. 2, a plurality of through-holes 11e are formed between the first movable contact 11 and the contact portion 11d. It functions as a connecting portion for connecting the base portion 12a of the portion 12 and the column portion 12b.
The operation member 10 having such a configuration is housed in a tiltable manner in the lower case 1 on which the second movable contact 6 is placed. At this time, the protrusion 3c of the first side wall 3 is positioned and guided in the recess 11c of the first movable contact 11, and the first movable contact 11 is stored in the lower case 1, The fitting of the concave portion 11c and the protruding portion 3c also functions as a rotation stopper for the operation member 10. When the operation member 10 is housed in the lower case 1, the outer surface of the contact portion 11 d of the first movable contact 11 comes into contact with the second movable contact 6. To become inclined to.
[0029]
Each of the four first fixed contacts 15 is made of metal, and as shown in FIGS. 3 and 8, a base portion 15a having a substantially fan shape, and a terminal portion 15b formed by bending downward from the base portion 15a, The abutting portion 16 is made of a thin metal plate and has a ring-shaped portion 16b having an octagonal through hole 16a at the center, and extends from the ring-shaped portion 16b in four directions. Leg 16c. The contact portion 16b does not necessarily need to be made of metal, and may be made of rigid synthetic resin.
[0030]
The first fixed contact 15 and the contact portion 16 are made of synthetic resin, are embedded in the support member 17 that forms the upper case, and are integrally fixed to the support member 17. The support member 17 is made of a synthetic resin molded product, and as shown in FIGS. 3, 8, and 9, is made of an octagonal thin plate, and has a base 17a having an eight-rectangular through-hole 17d at the center, and a base 17a. A triangular convex portion 17b that protrudes downward from the lower surface of the substrate 17a, and a connecting portion 17c that is formed on the outer edge of the base 17a and is positioned so as to face each other.
[0031]
Then, the first fixed contact 15 and the contact portion 16 are embedded and integrated on the same plane with respect to the support member 17. As shown in FIG. 8, the first fixed contact 15 is sandwiched and held between the base body 17a and the convex portion 17b, and the adjacent first fixed contacts 15 are integrated by the connecting portion 17c. ing. Further, the contact portion 16 located on the center side of the first fixed contact 15 is held in a state where the ring-shaped portion 16b is sandwiched between the base body 17a and the convex portion 17b, and the first portion by the convex portion 17b. It is integrated with the fixed contact 15, and the through hole 16 a is in communication with the through hole 17 d of the support member 17.
[0032]
The support member 17 having the first fixed contact 15 and the contact portion 16 embedded in this manner is fixed so as to cover the open portion of the lower case 1 as an upper case, and the support member 17 serving as the upper case. The lower case 1 constitutes a casing 7. At this time, as shown in FIG. 2, the terminal portion 15b of the first fixed contact 15 is bent inward and engaged with the concave portion 2e of the bottom wall portion 2, and the fixing is ensured. Further, the knob portion 12 of the operation member 10 is in a state of protruding from the through hole 16 a of the contact portion 16.
[0033]
When the support member 17 is fixed to the lower case 1, as shown in FIG. 2, the operation member 10 is in a state in which the protruding portion 11 a is pressed against the lower surface of the contact portion 16 by the urging force of the second movable contact 6. Become. The first movable contact 11 is separated from the first fixed contact 15 by positioning the projection 11 a in contact with the back surface of the contact portion 16. The first movable contact 11 and the first fixed contact 15 form a tilt switch S2, which is normally in an OFF state, and can save power.
[0034]
Then, referring to FIG. 10, the operation member 10 can tilt with the contact point between the protrusion 11 a and the contact portion 16 as the first fulcrum A. When the operation member 10 tilts, the first fixed contact 15 and the first movable contact 11 are in contact with each other, the first fixed contact 15 and the common contact 5 are conducted through the first movable contact 11 and the second movable contact 6, and are turned on. An azimuth detection signal that is an electric signal of 1 is output. That is, the terminal portion 15b of the first fixed contact 15 and the common contact 5 are turned ON, and an orientation detection signal is output.
[0035]
Further, when the operation member 10 is tilted in the same direction, as illustrated in FIG. 11, the operation member 10 tilts with the contact point between the first fixed contact 15 and the first movable contact 11 as the second fulcrum B. . Then, the contact portion 11d moves downward to press the second movable contact 6 so that the second movable contact 6 is reversed and the top portion 6a contacts the contact portion 4a of the second fixed contact 4. . Then, the common contact 5 and the second fixed contact 4 are brought into conduction and turned on, and a confirmation signal as a second electric signal is output. In addition, since the convex part 17b can go in and out of the escape part 11b of the 1st movable contact 11, it can be reduced in thickness and the operation member 10 can be tilted smoothly and can also serve as a tilt guide. Yes. Also,
[0036]
The cover member 20 is made of metal, and includes a substrate 20b in which a circular through hole 20a is formed in the center, and a leg portion 20c formed by bending downward from two opposing sides of the substrate 20b. The cover member 20 having such a shape covers the surface of the support member 17, and the leg portion 20c is bent inward to engage with the recess 2e of the bottom wall portion 2, so that the cover member 20 is securely fixed. It becomes. The cover member 20 has a function as an electric shield, and the terminal portion 20 is connected to a ground pattern or the like formed on a wiring board (not shown) so that static electricity or the like flows from the outside to the ground pattern. Therefore, more reliable detection is possible.
[0037]
The multi-directional input device in which the push switch of the present invention is used has the above-described configuration. Next, the operation of the multi-directional input device will be described with reference to FIGS. 10 and 11. When tilted in one of the arranged first fixed contacts 15, the operating member 10 tilts with the first fulcrum A as a fulcrum, and the first movable member 11 and the first fixed contact are tilted. 15 is contacted, and a direction detection signal as a first electric signal is input to a microcomputer disposed on a wiring board (not shown). Further, when the operating member 10 is tilted, the operating member 10 tilts with the second fulcrum B as a fulcrum, and the second movable contact 6 is pressed downward by the contact portion 11d, and the second fixed contact 4 and Contact. When the second fixed contact 4 and the second movable contact 6 come into contact with each other, a confirmation signal as a second electric signal is inputted to the microcomputer (not shown), and a signal (azimuth) in which the tilt direction is confirmed from the microcomputer. (Confirmation signal) is output to an external electric device. At this time, the operator can recognize that the azimuth determination signal has been output because the click feeling can be obtained by inverting the second movable contact 6.
[0038]
Next, when the pressing force on the operation member 10 is released, the second movable member 6 is restored, so that the contact portion 11d is pressed upward by this biasing force, and the projection portion 11a is brought into contact with the contact portion 16. 2, the operation member 10 automatically returns to the neutral position and returns to the state shown in FIG. 2. When the operating member 10 returns to the neutral position, the first fixed contact 15 and the first movable contact 11 are separated as well as the second fixed contact 4 and the second movable contact 6 are separated. Both switches S1 and S2 are turned off, which contributes to lower power consumption.
[0039]
Further, since the operation member 10 can move in eight directions, when the operation member 10 is tilted in the direction (diagonal direction) adjacent to the first fixed contact 15 disposed at the cross-shaped position, two pieces are provided. The first fixed contact 15 and the second movable contact 11 come into contact with each other, the first electric signal is input to the microcomputer, and it is recognized that the microcomputer is tilted in the oblique direction. When the operation member 10 is further tilted in this state, the push switch S1 is operated and the confirmation signal is input to the microcomputer as described above.
[0040]
When the operation member 10 is tilted with the first fulcrum A as a fulcrum, the second fixed contact 4 and the second movable contact 4 are moved by pressing the operation member 10 in the axial direction instead of the tilting operation. The contact 6 may be turned on.
[0041]
Further, when the operation member 10 is pressed in the axial direction in the neutral state, the first fixed contact 15 and the first movable contact 11 are separated from each other, that is, the tilt switch S2 is in the OFF state, and the second fixed contact 4 The push switch S1 is turned on by contact with the second movable contact 6, and only the second electric signal is input to the microcomputer. In this case, the microcomputer outputs a signal from the independent push switch S1 to an external electric device.
[0042]
When the operation member 10 is tilted and pressed in this way, the second movable member 6 is repeatedly inverted, and the top portion 6a contacts the contact portion 4a of the second fixed contact 4, and the contact portion 4a is moved downward. However, since the contact portion 4a is supported by the cross-shaped receiving portion 2b, the contact portion 4a is not deformed, and the switching with the top portion 6a is always reliably maintained in a good state. It is.
[0043]
The molded product manufactured by the molding die of the present invention is used for the lower case 1 which is a switch part constituting the multidirectional input device described above. Next, the molding die of the present invention and this The manufacturing method of the lower case 1 which is the used molded product will be described.
[0044]
The upper mold 25 as the first mold includes a first through hole 25a penetrating vertically, a pair of second through holes 25b formed so as to sandwich the first through hole 25a, and a lower surface The lower mold 26 as the second mold has an octagonal ring-shaped second recess 26a, and an octagonal shallow first recess 25c. A gate 26b formed to communicate with a part of the two recesses 26a and extend to the outside, a plurality of communication holes 26c formed to vertically penetrate, and a second recess 26a to extend downward. The upper mold 25 and the lower mold 26 are combined, and a cavity 27 is formed by the first and second recesses 25c and 26a. The cavity 27 communicates with the outside through the communication hole 26c.
[0045]
The first restraining pin 28 is a cylinder made of metal, and is formed by cutting out a cross-shaped groove 28a at the tip thereof. The first restraining pin 28 having such a configuration is a first through hole. It is held in 25a so as to be movable up and down without a gap. The second holding pin 29 is a cylinder made of metal, and is held in the second through hole 25b so as to be movable up and down without a gap. The diameters of the first and second holding pins 28 and 29 are larger than the diameter of the communication hole 26c. The eject pin 31 is made of a thin metal rod, and is capable of moving up and down without gaps in the pore 26d, with the tip thereof being in a position to block the connecting portion between the second recess 26a and the pore 26d. Is retained.
[0046]
The molding die of the present invention has the above-described configuration. Next, a method for producing a molded product using the molding die will be described. From the metal having the second fixed contact 4 and the common contact 5. A hoop-shaped contact plate 30 is disposed in a cavity 27 between the upper mold 25 and the lower mold 26, and the upper mold 25 and the lower mold 26 are clamped. At this time, the contact plate 30 is arranged so that the second fixed contact 4 and the common contact 5 are in a state of closing the end of the communication hole 26c. Then, the second fixed contact 4 is pressed at the tip where the groove portion 28a of the first holding pin 28 that can move up and down is formed, and the surface opposite to the pressing surface of the second fixed contact 4 Is pressed against the lower mold 26 side so that there is no gap between the contact portion 4a and the lower mold 26, and the contact portion 4a is prevented from moving by the molten resin pressure. At this time, since the contact surface 4c located in the center opposite to the pressing surface of the second fixed contact 4 is exposed in the communication hole 26c, the risk of the contact surface 4c being damaged is reduced, and further, the first holding pin Since the diameter of 28 is larger than the diameter of the communication hole 26c, the first restraining pin 28 does not enter the communication hole 26c, and the contact plate 30 can be reliably supported without being deformed. A cross-shaped groove 28a is positioned on the pressing surface side.
[0047]
A pair of second restraining pins 29 that can move up and down similarly to the first restraining pin 28 also presses the pressing surface of the contact portion 5b of the second common contact 5 against the lower mold 26 side, and thereby contacts 5b. However, it is held so as not to move due to the hot water pressure of the molten resin. Further, the contact surface 5d of the common contact 5 is also exposed in the communication hole 26c in the same manner as the contact surface 4c of the second fixed contact 4, and the diameter of the second restraining pin 29 is the diameter of the communication hole 26c. Therefore, the second restraining pin 29 does not enter the communication hole 26c, and the contact plate 30 can be reliably supported without being deformed.
[0048]
Thereafter, a molten thermoplastic resin such as polyethylene terephthalate (PET) is injected and filled into the cavity 27 from the gate 26b, and the second fixed contact 4 and the common contact 5 are embedded in the bottom wall portion 2. At the same time, the molding member 35 is molded in a state where the side wall 3 is molded and stored by the resin filled in the second recess 26a. At this time, since the first holding pin 28 is formed with a cross-shaped groove 28 a, the molten resin is filled in the groove 28 a, and the cross-shaped receiving portion 2 b becomes the second fixed contact 4. It is formed to support the contact portion 4a. Then, after solidifying the resin after a predetermined time, when the lower mold 26 is moved from the upper mold 25 and the upper mold 25 is detached from the molding member 35, the molding member 35 is moved to the side wall 3. Is positioned on the lower mold 26 while being held in the second recess 26a. Further, when the upper mold 25 is removed, when the first holding pin 28 is removed, four first holes 2a are formed on the back surface of the contact portion 4a, and when the second holding pin 29 is removed, The second hole 2c is formed so as to extend from the back surface of the contact portion 5b of the second common contact 5.
[0049]
Thereafter, when the top 3 d of the side wall 3 is pressed by the eject pin 31 and the molding member 35 is pushed out, air flows into the space 36 formed between the molding member 35 and the lower mold 26 from the communication hole 26 c. And since the atmospheric | air pressure of the space part 36 turns into atmospheric pressure, the shaping | molding member 35 is extruded smoothly and the lower case 1 which is a molded article is manufactured. The reason why the eject pin 31 is provided on the top 3d of the side wall 3 is to prevent the resin from adhering to the contact. That is, when the eject pin 31 is brought into contact with the contact formation surface, it enters between the lower mold 26 and the pores 26d caused by wear, and a resin burr is generated.
[0050]
  next,Using FIG. 15 and FIG.Mold of the present inventionReference exampleAnd a method of manufacturing a molded product using the sameSecond reference exampleExplain.
[0051]
  Molding mold of the present invention based on FIGS.Reference example, And a second method of manufacturing a molded product using this moldReference exampleThe first embodimentAnd reference examplesHowever, the communication hole 26c is closed by the contact plate 30, whereas the communication hole 26c is not disposed at the position facing the contacts 4 and 5, but directly communicates with the cavity 27 at the time of molding. A closing pin 37 is inserted in the cavity 27 to seal the inside of the cavity 27.
[0052]
Next, the manufacturing method will be described. As shown in FIG. 15, the closing pin 37 is inserted into the communication hole 26c to seal the cavity 27, and in this state, the molten resin is injected and filled into the cavity 27. . At this time, since the closing pin 37 closes the communication hole 26 c, the molten resin does not leak from the cavity 27. Then, as shown in FIG. 16, after filling the molten resin, the closing pin 37 is pulled out, the communication hole 26c is directly communicated with the cavity 27, and the molding member 25 is pushed out by the eject pin 31, whereby the lower case 1 as a molded product is manufactured. The In the present embodiment, since the position of the communication hole 26c does not need to be aligned with the contacts 4 and 5, even if the position of the contact plate 30 is shifted, the molding member 35 can be reliably molded. Since other configurations and manufacturing methods are the same as those in the first embodiment, the same members are denoted by the same reference numerals and description thereof is omitted here.
[0053]
The molding die of the present invention has the above-described configuration, and the manufacturing method using this die has been described above. Needless to say, the upper die 25 is used as the second die. A communication hole may be provided, and the lower mold 26 may be the first mold. Further, the upper mold 25 may be a movable mold. In addition, a plurality of communication holes 26c are provided in the above embodiment, but may be one. Moreover, it is good also as feeding a compressed air from the communicating hole 26c, and also making it easy to take out a molding member. In the above embodiment, an example has been described in which the lower case, which is a switch component constituting the multidirectional input device, is manufactured as a molded product using a molding die. However, it goes without saying that the present invention is not limited to the multidirectional input device. Absent. Furthermore, the present invention can be applied only to a molded product made of a synthetic resin without embedding a metal plate such as a contact plate.
[0054]
【The invention's effect】
Since the second die of the molding die of the present invention is provided with a communication hole that communicates the cavity and the outside, the contact between the molding member and the die when the molding member is pushed out by the eject pin. Since air flows into the portion, the molded member can be easily taken out, and the risk of deformation of the molded member is reduced. In addition, the eject pins can be arranged with a degree of freedom.
[0055]
In addition, since a plurality of communication holes are provided in the second mold in a dispersed manner, air can easily flow in, and the molded member can be pushed out and taken out more easily.
[0056]
In addition, since the contact plate is provided at a position that closes the communication hole, there is no risk of the molten resin leaking into the communication hole, and a molded product having a desired shape can be obtained. Moreover, since the contact plate is not damaged, the risk of contact failure is reduced.
[0057]
In addition, since the fixed contact is provided at a position that closes the communication hole, there is no risk of the molten resin leaking into the communication hole, and a molded product having a desired shape can be obtained. Further, since the fixed contact is not damaged, the risk of contact failure is further reduced.
[0058]
Moreover, since the diameter of the holding pin is larger than the diameter of the communication hole, the contact plate or the fixed contact can be surely pressed against the second mold, so that a high-quality molded product can be manufactured. Can do.
[0059]
In addition, since the eject pin is configured to be able to press the top of the side wall of the case, which is a molded member, the molded member can be pushed out at a position away from the contact plate and the fixed contact. The risk of hurting can be avoided.
[Brief description of the drawings]
FIG. 1 is a top view of a multidirectional input device in which a molded product manufactured by a molding die of the present invention is used.
FIG. 2 is a cross-sectional view taken along line 2-2 in FIG.
FIG. 3 is an exploded perspective view of a multidirectional input device in which a molded product manufactured by the molding die of the present invention is used.
FIG. 4 is a bottom view of a lower case according to a multidirectional input device in which a molded product manufactured by the molding die of the present invention is used.
5 is a cross-sectional view taken along line 5-5 in FIG.
FIG. 6 is an enlarged cross-sectional view of a main part of a switch of a lower case according to a multidirectional input device in which a molded product manufactured by the molding die of the present invention is used.
FIG. 7 is a cross-sectional view of an essential part of an operation member according to a multidirectional input device in which a molded product manufactured by the molding die of the present invention is used.
FIG. 8 is a bottom view of a support member in which members according to a multidirectional input device in which a molded product manufactured by the molding die of the present invention is used is embedded.
9 is a cross-sectional view taken along line 9-9 in FIG.
FIG. 10 is an operation explanatory diagram of a multidirectional input device in which a molded product manufactured by the molding die of the present invention is used.
FIG. 11 is an operation explanatory diagram of a multidirectional input device in which a molded product manufactured by the molding die of the present invention is used.
FIG. 12 is a cross-sectional view of an essential part in the first embodiment of the molding die of the present invention.
FIG. 13 shows a first method of manufacturing a molding die according to the present invention.Reference exampleExplanatory diagram showing
FIG. 14 shows a first method of manufacturing a mold according to the present invention.Reference exampleExplanatory diagram showing
FIG. 15 shows a molding die of the present invention.Reference example, And second of the method of manufacturing a molded productReference exampleExplanatory drawing showing
FIG. 16 is a molding die of the present invention.Reference diagram, And second of the method of manufacturing a molded productReference exampleExplanatory drawing showing
FIG. 17 is a sectional view of the main part of a conventional molding die.
FIG. 18 is an explanatory diagram showing a conventional method of manufacturing a molded product
FIG. 19 is an explanatory view showing a conventional method for manufacturing a molded product.
[Explanation of symbols]
1 Lower case (switch parts)
2 Bottom wall
3 Side wall
3d top
4 Second fixed contact
4a Contact part
4c Contact surface
5 Common contacts
5a Contact part
5d Contact surface
6 Second movable contact
7 Casing
10 Operation members
11 First movable contact
12 Knob
15 First fixed contact
16 Contact part
17 Support member
20 Cover member
25 Upper mold
25a First through hole
25b Second through hole
25c first recess
26 Lower mold
26a Second recess
26b gate
26c communication hole
26d pore
27 cavities
28 First holding pin
28a Groove
29 Second holding pin
30 Contact plate
31 Eject pin
35 Molded parts
36 Space
37 Blocking pin
S1 push switch
S2 Tilt switch

Claims

The first mold and the second mold which is fitted to the first mold and forms a cavity between the first mold and the molten resin injected into the cavity are solidified. And an eject pin for extruding the formed molding member, and the second mold can hold the molded member when the first mold is removed, and the second mold The eject pin that pushes out the held molding member is movably accommodated, and a communication hole that communicates the cavity with the outside is provided, and the molding member has a contact plate embedded in resin, The contact plate is provided with a fixed contact having a bulging portion that bulges on one side, and the second mold has a support portion against which the contact surface of the fixed contact is pressed, and the support portion has an inner side on the support portion. The communication hole is formed so as to communicate with the contact surface located Mold, characterized in that the fixed contact is provided at a position for closing the communication hole at the time of mold clamping.

2. The molding die according to claim 1, wherein a plurality of the communication holes are dispersed and provided in the second die.

When the molten resin is injected into the first mold, a pressing pin that presses the contact plate or the fixed contact and presses the opposite surface to the second mold side is movable. The molding die according to claim 1 or 2, wherein the molding die is housed and the diameter of the holding pin is larger than the diameter of the communication hole .

The molding member includes a case having a bottom wall portion in which the contact plate is embedded and a side wall portion provided integrally with the bottom wall portion, and the side wall portion is a concave portion provided in the second mold. The molding die according to any one of claims 1 to 3 , wherein the molding die can be held inside and the eject pin can press a top portion of the side wall portion .