JP3660151B2

JP3660151B2 - Mounting structure of slide type variable resistor

Info

Publication number: JP3660151B2
Application number: JP04625499A
Authority: JP
Inventors: 章吾阿部
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 1999-02-24
Filing date: 1999-02-24
Publication date: 2005-06-15
Anticipated expiration: 2019-02-24
Also published as: JP2000243611A

Description

【０００１】
【発明の属する技術分野】
本発明は、スライド操作により抵抗値が変化するスライド型可変抵抗器を回路基板に取り付けるスライド型可変抵抗器の取付構造に係り、特に、操作者に帯電した静電気が抵抗体や集電体に侵入のを防止する静電対策構造に関する。
【０００２】
【従来の技術】
図１３乃至図１６は従来のスライド型可変抵抗器の取付構造を示すもので、スライド型可変抵抗器５１は、下部及び両端部が開放された断面コ字状のフレーム５２を備え、このフレーム５２は、矩形状の上板部５３と、この上板部５３の長手方向に延びるように上板部５３の両縁に対向して設けられた一対の側板部５４とを有している。そして、図１３に示すように、このフレーム５２の両端部には、上方に一段上がった断面コ字状の延長部５５が各々設けられており、この延長部５５の側壁部５６には、その下端の一角が切り欠かれて段部５７が形成され、この段部５７の下部に突起５８が突設されている。
【０００３】
このフレーム５２内には、矩形状の絶縁基板５９が下面を下に向けて保持されており、この絶縁基板５９の下面には、帯状の抵抗体６０とこの抵抗体６０と所定間隔を置いて抵抗体６０に沿って帯状に延びる集電体６１とが印刷等にて形成されている。また、この抵抗体６０と集電体６１の両端部には、鳩目６２によって絶縁基板５９に固着された端子６３，６４が各々接続されており、この端子６３，６４は、何れもその先端部６３ａ，６４ａが絶縁基板５９の下面と平行に折り曲げられて延長部５５からフレーム５２外に延設されている。
【０００４】
また、このスライド型可変抵抗器５１は、コ字状の保持部６５とこの保持部６５に連設された直方体状のつまみ部６６とからなる操作部材６７と、４角形の平板部６８とこの平板部６８の一縁に設けられた一対の摺動子６９とからなる導電性を有する止め板７０とを備え、図１３に示すように、操作部材６７の保持部６５の下部には４個の突起状の固着部６５ａが形成されており、また、止め板７０の平板部６８の４角には取付孔６８ａが各々穿設されている。
【０００５】
そして、図１４に示すように、この操作部材６７の保持部６５内にフレーム５２が位置して、保持部６５の内面にフレーム５２の上板部５３の外面及び一対の側板部５４の外面が当接しており、操作部材６７は、取付孔６８ａに貫通された固着部６５ａを熱溶融することにより保持部６５に支持された止め板７０と協力してフレーム５２を挟み込み、一対の摺動子６９が各々抵抗体６０と集電体６１とに摺接した状態で、フレーム５２にスライド自在に支持されている。
【０００６】
このように構成されたスライド型可変抵抗器５１は、ＩＣやコンデンサ等の電気素子（不図示）を実装して電気回路を構成する回路基板７１に端子６３，６４の先端部６３ａ，６４ａが各々半田付けされて取り付けられ、端子６３，６３間に電流・電圧を加えた状態で、操作者が手指でつまみ部６６をフレーム５２の長手方向（矢印Ｂ方向）に操作すると、操作部材６７が一対の摺動子６９と一体にスライドし、一対の摺動子６９が抵抗体６０と集電体６１との上を摺動することにより、一対の摺動子６９による抵抗体６０と集電体６１との導通位置が変化し、この導通位置に対応した電流・電圧の出力が端子６４の先端部６４ａから得られるようになっている。
【０００７】
【発明が解決しようとする課題】
しかしながら、上述した従来のスライド型可変抵抗器の取付構造にあっては、かかるつまみ部６６の手動操作時に、操作者に帯電した静電気がつまみ部６６に放電されると、この静電気はつまみ部６６から抵抗体６０や集電体６１あるいは端子６３，６４等最も絶縁抵抗が小さくなる経路を伝わって放電し、この放電された静電気が回路基板７１に実装されたＩＣに流れ込むと、このＩＣが破壊されてしまうという虞があった。
【０００８】
本発明は上述した従来技術の事情に鑑みてなされたもので、その目的は、操作者に帯電した静電気を確実に逃がすことができ、信頼性の高いスライド型可変抵抗器の取付構造を提供することである。
【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、本発明は、抵抗体とこの抵抗体と所定間隔を置いて該抵抗体に沿って延びる集電体とが下面側に露出して形成された絶縁基板と、上板部を有しその下面側に前記絶縁基板を保持する絶縁製のフレームと、前記抵抗体と前記集電体とに摺接しこれらを導通させる摺動子と、前記フレームにスライド自在に支持されて前記摺動子を前記抵抗体と前記集電体との上で摺動させる操作部材とからなるスライド型可変抵抗器と、接地用導体パターンが形成された回路基板とを備えてなり、天板部を有する導電薄板で形成され、該天板部が前記フレームの前記上板部を覆って前記フレームに取り付けられる静電気を流すための導電部材を前記スライド型可変抵抗器に取り付け、前記絶縁基板と前記導電部材との間に前記フレームを配置して、前記操作部材をスライド動作の位置にかかわらず、常に前記導電部材の天板部に接触させると共に、前記導電部材の一部を前記接地用導体パターンに導通あるいは近接させて、前記スライド型可変抵抗器を前記回路基板に支持するようにした。
【００１０】
また、上記課題を解決するための第２の手段として、本発明は、抵抗体とこの抵抗体と所定間隔を置いて該抵抗体に沿って延びる集電体とが下面側に露出して形成された絶縁基板と、上板部を有しその下面側に前記絶縁基板を保持する絶縁製のフレームと、前記抵抗体と前記集電体とに摺接しこれらを導通させる摺動子と、前記フレームにスライド自在に支持されて前記摺動子を前記抵抗体と前記集電体との上で摺動させる操作部材とからなるスライド型可変抵抗器と、接地用導体パターンが形成された回路基板とを備えてなり、天板部を有する導電薄板で形成され、該天板部が前記フレームの前記上板部を覆って前記フレームに取り付けられる静電気を流すための導電部材を前記スライド型可変抵抗器に取り付け、前記絶縁基板と前記導電部材との間に前記フレームを配置して、前記操作部材をスライド動作の位置にかかわらず、常に前記導電部材の天板部に接触させると共に、前記絶縁基板には空き端子を取り付け、この空き端子を前記接地用導体パターンに接続するとともに、前記導電部材の一部を前記空き端子に導通あるいは近接させて、前記スライド型可変抵抗器を前記回路基板に支持するようにした。
【００１１】
また、上記課題を解決するための第３の手段として、本発明は、前記第１，第２の手段において、前記操作部材につまみ部を設け、このつまみ部を前記導電部材に接触させるようにした。
【００１３】
また、上記課題を解決するための第４の手段として、本発明は、前記第３の手段において、前記導電部材に前記つまみ部が突出可能なスリットを設けた構成とした。
【００１４】
【発明の実施の形態】
以下、本発明のスライド型可変抵抗器の取付構造の第１の実施形態を図１乃至図８を用いて説明する。
【００１５】
このスライド型可変抵抗器の取付構造は、スライド型可変抵抗器１が回路基板３８に取り付けられてなっており、スライド型可変抵抗器１は、絶縁合成樹脂製のフレーム２と、このフレーム２内に保持される絶縁基板１１と、一対の摺動子２８を有する止め板２６と、この止め板２６とでフレーム２を挟み込みフレーム２にスライド自在に支持される操作部材１９と、フレーム２に取り付けられる導電部材３０とで構成されている。
【００１６】
フレーム２は、下部及び両端部が開放された断面コ字状の筐体からなり、矩形状の上板部３と、この上板部３の長手方向に延びるように上板部３の下面の両縁に対向して設けられた一対の側板部４，５とを有している。そして、図１に示すように、このフレーム２の両端部には、上方に一段上がった断面コ字状の延長部６が各々設けられており、この延長部６には切欠部７が形成されている。また、この延長部６の側壁部８には、その下端の一角が切り欠かれて段部９が形成され、この段部９の下部９ａに突起１０が突設されている。
【００１７】
絶縁基板１１は、絶縁合成樹脂材料から矩形状に形成され、その下面には、帯状の抵抗体１２とこの抵抗体１２と所定間隔を置いて抵抗体１２に沿って帯状に延びる集電体１３とが印刷等にて形成されている。この抵抗体１２の両端部と集電体１３の一端部には、鳩目１４によって絶縁基板１１の上面に固着された３本の端子１５，１６，１７が各々接続されており、この３本の端子１５，１６，１７は絶縁基板１１の下面側に折り曲げられた後、その先端部１５ａ，１６ａ，１７ａが何れも絶縁基板１１の下面と平行に折り曲げられている。また、この絶縁基板１１の他端部には、その上面に電気的に独立した空き端子１８が取り付けられており、この空き端子１８は、３本の端子１５，１６，１８と同様に、絶縁基板１１の下面側に折り曲げられた後、その先端部１８ａが絶縁基板１１の下面と平行に折り曲げられている。そして、この絶縁基板１１は、３本の端子１５，１６，１７の先端部１５ａ，１６ａ，１７ａ及び空き端子１８の先端部１８ａを延長部６からフレーム２外に延設させてフレーム２内に保持されている。
【００１８】
操作部材１９は、絶縁合成樹脂材料を成形してなるもので、矩形状の上壁部２０とこの上壁部２０の下面に対向して立設された一対の側壁部２１，２２とからなるコ字状の保持部２３と、この保持部２３の一方の側壁部２２に連設された直方体状のつまみ部２４とを有しており、図１に示すように、一対の側壁部２１，２２の下部には４個の突起状の固着部２５が形成されている。そして、この操作部材１９は、一対の側壁部２１，２２間にフレーム２が位置し、図８に示すように、上壁部２０及び一対の側壁部２１，２２の内面をフレーム２の上板部３及び一対の側板部４，５の外面に各々当接させている。
【００１９】
止め板２６は、導電金属薄板から角形に形成され、４角形の平板部２７と、この平板部２７の一縁に設けられた一対の摺動子２８とを有しており、平板部２７の４角には取付孔２９が各々穿設されている。そして、この止め板２６は、その４個の取付孔２９に各々貫通された固着部２５を熱溶融することによって操作部材１９に取り付けられおり、止め板２６は、その平板部２７が操作部材１９と協力してフレーム２を挟み込み、一対の摺動子２８が各々抵抗体１２と集電体１３とに摺接した状態で、操作部材１９をフレーム２にスライド自在に支持している。
【００２０】
導電部材３０は、鉄製の矩形状の導電薄板からなり、その両端部を下方へ垂直に折り曲げることにより、図１に示すように、曲折部３１が形成されている。この曲折部３１の下部には、Ｌ字状の係合爪部３２が設けられており、一方の曲折部３１には、その下部に静電気導出突片３３が係合爪部３２と並んで設けられている。また、導電部材３０の天板部３４には、矩形状のスリット３５が穿設されており、天板部３４の両端部には一対の位置決め突片３６，３７が対向して設けられている。そして、この導電部材３０は、位置決め突片３６をフレーム２の切欠部７内に位置させるとともに、位置決め突片３７の内面を延長部６の側壁部８の外面に当接させて、フレーム２に対する位置決めがなされた状態で、係合爪部３２を段部９の上部９ｂに掛け止めしてフレーム２に取り付けられており、図７，図８に示すように、フレーム２の上板部３の外面一面を天板部３４が覆い、天板部３４の下面が操作部材１９の上壁部２０に当接し、また、静電気導出突片３３が絶縁基板１１に支持された空き端子１８と当接している。
【００２１】
一方、このように構成されたスライド型可変抵抗器１が取り付けられる回路基板３８は、絶縁合成樹脂材料から矩形状に形成され、図６に示すように、フレーム２の突起１０が挿入される孔３９が穿設されている。また、回路基板３８の上面には、ＩＣやコンデンサ等の電気素子（不図示）が実装されているとともに、この電気素子に接続して図示せぬ電気回路を構成する導体パターン４０，４１と、この図示せぬ電気回路のグランドに接地される接地用導体パターン４２とが形成されている。そして、導体パターン４０には端子１５の先端部１５ａが接続されるランド部４０ａが設けられており、また、導体パターン４１には端子１６，１７の先端部１６ａ，１７ａが接続されるランド部４１ａが設けられている。また、導体パターン接地用導体パターン４２には空き端子１８の先端部１８ａが接続されるランド部４２ａが設けられている。
【００２２】
次に、このスライド型可変抵抗器の取付構造の組立方法を説明すると、先ず、抵抗体１２及び集電体１３が形成された絶縁基板１１に３本の端子１５，１６，１７及び空き端子１８を固着する。次に、この絶縁基板１１の縁部を一対の側板部４，５の内面にかしめ付けて、絶縁基板１１をフレーム２内に保持させる。次いで、操作部材１９の一対の側壁部２１，２２間にフレーム２を位置させて操作部材１９とフレーム２とを組み合わせ、この状態で４個の固着部２５に止め板２６の取付孔２９を挿通させて、これら固着部２５を熱溶融することにより止め板２６を操作部材１９に取り付ける。次に、位置決め突片３６がフレーム２の切欠部７に対応するように、導電部材３０をフレーム２の上部に被せると、係合爪部３２がフレーム２の延長部６の縁部とぶつかった状態となり、この状態で導電部材３０を下方へ押し込むと、導電部材３０の弾性によって係合爪部３２が外方へ撓み、係合爪部３２の先端が延長部６の段部９の上部９ｂに至ったときに、係合爪部３２は元の状態に復元して係合爪部３２が段部９の上部９ｂに掛け止めされ、導電部材３０がフレーム２に取り付けられる。
【００２３】
しかる後、このように組み立てられたスライド型可変抵抗器１を、その突起１０を孔３９に挿通して回路基板３８の上面に載置すると、端子１５の先端部１５ａがランド部４０ａに当接し、端子１６，１７の先端部１６ａ，１７ａがランド部４１ａに当接するとともに、空き端子１８の先端部１８ａがランド部４２ａに当接した状態となる。この状態で、これら先端部１５ａ，１６ａ，１７ａ，１８ａを半田（不図示）を用いてランド部４０ａ，４１ａ，４２ａに接続することにより、スライド型可変抵抗器１が回路基板８に取り付けられる。
【００２４】
このようにしてスライド型可変抵抗器の取付構造の組立は完了するが、組立後においては、一対の摺動子２８が各々抵抗体１２及び集電体１３に摺接して止め板２６が抵抗体１２と集電体１３とを導通させ、また、操作部材１９は、その保持部２３の上壁部２０が操作部材１９のスライド動作における位置にかかわらず、常に導電部材３０の天板部３４の下面に接触するようになっている。また、導電部材３０と接地用導体パターン４１とは、静電気導出突片３３及び空き端子１８を介して電気的に接続されて導通した状態となっている。
【００２５】
また、図５に示すように、フレーム２の延長部６は、操作部材１９の一対の側壁部２１，２２の両端面と対向し、操作部材１９が上板部３４の両端に位置したときに、この延長部６が一対の側壁部２１，２２の両端面と各々当接して操作部材１９のスライドを上板部３４の範囲内に規定するようになっており、この延長部６は、掛け止めにより導電部材３０をフレーム２に支持する機能と、操作部材１９のスライド範囲を規定するストッパー機能との２つの機能を有している。
【００２６】
しかして、このように構成・組み立てられたスライド型可変抵抗器の取付構造にあっては、回路基板３８の上面に構成された図示せぬ電気回路から導体パターン４１を介して端子１６，１７間に所定の電流・電圧が加えられた状態で、操作者が手指でつまみ部２４をフレーム２の長手方向（矢印Ａ方向）に操作すると、操作部材１９が一対の摺動子２８と一体にスライドし、一対の摺動子２８が抵抗体１２と集電体１３との上を摺動することにより、一対の摺動子２８による抵抗体１２と集電体１３との導通位置が変化し、この導通位置に対応した電流・電圧の出力が端子１５の先端部１５ａから得られ、こうして得られた電流・電圧の出力が、端子１５の先端部１５ａが接続された導体パターン４０を介して上記図示せぬ電気回路に導出されるようになっている。
【００２７】
そして、つまみ部２４と導電部材３０とは近接していて、また、沿面距離も短く、静電気導出突片３３と空き端子１８との間の距離が近いので、つまみ部２４と空き端子１８との間の絶縁抵抗の方が、つまみ部２４と端子１５，１６，１７との間の絶縁抵抗に比べ小さくなる。従って、つまみ部２４の手動操作時に、操作者に帯電した静電気がつまみ部２４に放電されると、この静電気は、つまみ部から保持部２３、導電部材３０の天板部３４、静電気導出突片３３、空き端子１８と伝わって、接地された接地用導体パターン４２に導出される。従って、つまみ部２４に放電された静電気は、保持部２３、導電部材３０の天板部３４、静電気導出突片３３、空き端子１８を介して接地用導体パターン４２に確実に流れ込み、端子１５，１６，１７に流れ込むことはなく、静電気により回路基板３８の上面に実装されたＩＣ（不図示）が破壊されることを完全に防止できる。
【００２８】
尚、上記実施形態では、導電部材３０の一部である静電気導出突片３３と空き端子１８とを当接させた構成で説明したが、静電気が静電気導出突片３３から近傍の端子１６等の他の部材に放電しない範囲内で、静電気導出突片３３と空き端子１８との間に微小ギャップが形成されるように、静電気導出突片３３と空き端子１８とを近接させた構成としてもよい。
【００２９】
また、上記実施形態では、操作部材１９の上壁部２０を導電部材３０の天板部３４の下面に当接させた構成としたが、つまみ部２４を直に導電部材３０の天板部３４の下面に当接させ、つまみ部２４を操作部材１９のスライド動作における位置にかかわらず、つまみ部２４が常に導電部材３０の天板部３４の下面に接触するようにしてもよく、この場合、静電気はつまみ部２４から直接導電部材３０に伝わるため、静電気をより確実に接地用導体パターン４２に流し込むことができる。また、従来の可変抵抗器に切欠部７を設けて導電部材３０を取り付けるだけでよく、回路パターンのラウンド形状の変更の必要がなく容易に可能である。
【００３０】
次に、図９は本発明の第２の実施形態を示し、この第２の実施形態が上記第１の実施形態と異なる点は、空き端子１８を除去し、その代わりに静電気導出突片３３を延設させて静電気導出突片４３とし、この静電気導出突片４３を図示せぬ半田により直に接地用導体パターン４２のランド部４２ａに接続して導通させた点であり、他は上記第１の実施形態と同様である。この場合、操作者に帯電した静電気がつまみ部２４に放電されると、この静電気は、つまみ部２４から保持部２３、導電部材３０の天板部３４、静電気導出突片４３と伝わって、接地された接地用導体パターン４２に導出される。
【００３１】
このように構成された第２の実施形態にあっては、静電気導出突片４３が上記第１の実施形態の静電気導出突片３３よりも長いため、導電部材３０の母材となる鉄製の導電薄板の使用量は多くなるものの、空き端子１８を除去できる分だけ部品点数を削減できる。尚、この第２の実施形態においては、静電気導出突片４３を接地用導体パターン４２のランド部４２ａに導通させることなく、静電気が静電気導出突片４３から近傍の端子１６等の他の部材に放電しない範囲内で、静電気導出突片４３とランド部４２ａとの間に微小ギャップが形成されるように、静電気導出突片４３とランド部４２ａとを近接させた構成としてもよい。
【００３２】
また、この第２の実施形態においても、操作部材１９の上壁部２０を導電部材３０の天板部３４の下面に当接させた構成としたが、つまみ部２４を直に導電部材３０の天板部３４の下面に当接させ、つまみ部２４を操作部材１９のスライド動作における位置にかかわらず、つまみ部２４が常に導電部材３０の天板部３４の下面に接触するようにしてもよく、この場合、静電気はつまみ部２４から直接導電部材３０に伝わるため、静電気をより確実に接地用導体パターン４２に流し込むことができる。
【００３３】
また、図１０乃至図１１は本発明の第３の実施形態を示し、この第３の実施形態が上記第１の実施形態と異なる点は、つまみ部２４を側壁部２２に代えて上壁部２０に設け、このつまみ部２４を導電部材３０の天板部３４に穿設されたスリット３５から突出させ、天板部３４の上方においてつまみ部２４を操作できるようにした点であり、他は上記第１の実施形態と同様である。
【００３４】
このように構成された第３の実施形態にあっては、つまみ部２４の形成位置を変更するだけで、導電部材３０の天板部３４の上方においてつまみ部２４を操作可能とすることができ、製品にバリエーションをもたせることができる。尚、導電部材３０は、上記第１の実施形態に示すようなつまみ部２４を導電部材３０の側方で操作するものと、この第３の実施形態に示すようなつまみ部２４を導電部材３０の上方で操作するものとで、形状・構成を変えることなく共通に用いることができ、同一の工程で製造することが可能である。
【００３５】
また、図１２は本発明の第４の実施形態を示し、この第４の実施形態は上記第２，第３の実施形態を組み合わせたもので、この第４の実施形態が上記第１の実施形態と異なる点は、空き端子１８を除去し、その代わりに静電気導出突片３３を延設させて静電気導出突片４３とし、この静電気導出突片４３を図示せぬ半田により直に接地用導体パターン４２のランド部４２ａに接続して導通させた点と、つまみ部２４を側壁部２２に代えて上壁部２０に設け、このつまみ部２４を導電部材３０の天板部３４に穿設されたスリット３５から突出させ、天板部３４の上方においてつまみ部２４を操作できるようにした点であり、他は上記第１の実施形態と同様である。
【００３６】
このように構成された第２の実施形態にあっては、空き端子１８を除去できる分だけ部品点数を削減できるとともに、つまみ部２４の形成位置を変更するだけで、導電部材３０の上方においてつまみ部２４を操作可能とすることができ、また、つまみ部２４を導電部材３０の側方で操作するものと、つまみ部２４を導電部材３０の上方で操作するものとで導電部材３０の共通化を図ることができる。
【００３７】
【発明の効果】
本発明は、以上説明したような形態で実施され、以下に記載されるような効果を奏する。
【００３８】
抵抗体とこの抵抗体と所定間隔を置いて該抵抗体に沿って延びる集電体とが下面側に露出して形成された絶縁基板と、上板部を有しその下面側に前記絶縁基板を保持する絶縁製のフレームと、前記抵抗体と前記集電体とに摺接しこれらを導通させる摺動子と、前記フレームにスライド自在に支持されて前記摺動子を前記抵抗体と前記集電体との上で摺動させる操作部材とからなるスライド型可変抵抗器と、接地用導体パターンが形成された回路基板とを備えてなり、天板部を有する導電薄板で形成され、該天板部が前記フレームの前記上板部を覆って前記フレームに取り付けられる静電気を流すための導電部材を前記スライド型可変抵抗器に取り付け、前記絶縁基板と前記導電部材との間に前記フレームを配置して、前記操作部材をスライド動作の位置にかかわらず、常に前記導電部材の天板部に接触させると共に、前記導電部材の一部を前記接地用導体パターンに導通あるいは近接させて、前記スライド型可変抵抗器を前記回路基板に支持したので、操作者に帯電した静電気を前記導電部材を介して前記接地用導体パターンに確実に逃がすことができ、信頼性の高いスライド型可変抵抗器の取付構造を提供できる。
【００３９】
また、抵抗体とこの抵抗体と所定間隔を置いて該抵抗体に沿って延びる集電体とが下面側に露出して形成された絶縁基板と、上板部を有しその下面側に前記絶縁基板を保持する絶縁製のフレームと、前記抵抗体と前記集電体とに摺接しこれらを導通させる摺動子と、前記フレームにスライド自在に支持されて前記摺動子を前記抵抗体と前記集電体との上で摺動させる操作部材とからなるスライド型可変抵抗器と、接地用導体パターンが形成された回路基板とを備えてなり、天板部を有する導電薄板で形成され、該天板部が前記フレームの前記上板部を覆って前記フレームに取り付けられる静電気を流すための導電部材を前記スライド型可変抵抗器に取り付け、前記絶縁基板と前記導電部材との間に前記フレームを配置して、前記操作部材をスライド動作の位置にかかわらず、常に前記導電部材の天板部に接触させると共に、前記絶縁基板には空き端子を取り付け、この空き端子を前記接地用導体パターンに接続するとともに、前記導電部材の一部を前記空き端子に導通あるいは近接させて、前記スライド型可変抵抗器を前記回路基板に支持したので、操作者に帯電した静電気を前記導電部材及び前記空き端子を介して前記接地用導体パターンに確実に逃がすことができ、信頼性の高いスライド型可変抵抗器の取付構造を提供できる。
【００４０】
また、前記操作部材につまみ部を設け、このつまみ部を前記導電部材に接触させたので、静電気は前記つまみ部から直接前記導電部材に伝わるため、静電気を前記接地用導体パターンにより確実に逃がすことができる。
【００４１】
また、前記導電部材は、鉄製の導電平板で構成されて前記フレームの一面を覆うように前記フレームに取り付けられているので、前記つまみ部を操作部材１９のスライド動作における位置にかかわらず、常に前記導電部材に接触させることができ、前記操作部材のスライド範囲において、任意の位置で静電気を前記接地用導体パターンに確実に逃がすことができる。
【００４２】
また、前記導電部材に前記つまみ部が突出可能なスリットを設けたので、静電気を前記接地用導体パターンに確実に逃がす静電気対策を施した上で、前記スライド型可変抵抗器に製品バリエーションをもたせることができる。
【図面の簡単な説明】
【図１】本発明の第１の実施形態のスライド型可変抵抗器の取付構造に係るスライド型可変抵抗器の分解斜視図。
【図２】本発明の第１の実施形態のスライド型可変抵抗器の取付構造に係るスライド型可変抵抗器の平面図。
【図３】本発明の第１の実施形態のスライド型可変抵抗器の取付構造に係るスライド型可変抵抗器の正面図。
【図４】本発明の第１の実施形態のスライド型可変抵抗器の取付構造に係るスライド型可変抵抗器の側面図。
【図５】本発明の第１の実施形態のスライド型可変抵抗器の取付構造に係るスライド型可変抵抗器の裏面図。
【図６】本発明のスライド型可変抵抗器の取付構造に係る回路基板の平面図。
【図７】本発明の第１の実施形態のスライド型可変抵抗器の取付構造の縦断面図。
【図８】本発明の第１の実施形態のスライド型可変抵抗器の取付構造の横断面図。
【図９】本発明の第２の実施形態のスライド型可変抵抗器の取付構造の縦断面図。
【図１０】本発明の第３の実施形態のスライド型可変抵抗器の取付構造に係る操作部材の斜視図。
【図１１】本発明の第３の実施形態のスライド型可変抵抗器の取付構造の横断面図。
【図１２】本発明の第４の実施形態のスライド型可変抵抗器の取付構造の縦断面図。
【図１３】従来のスライド型可変抵抗器の取付構造に係るスライド型可変抵抗器の分解斜視図。
【図１４】従来のスライド型可変抵抗器の取付構造に係るスライド型可変抵抗器の裏面図。
【図１５】従来のスライド型可変抵抗器の取付構造の横断面図。
【図１６】従来のスライド型可変抵抗器の取付構造の縦断面図。
【符号の説明】
１スライド型可変抵抗器
２フレーム
３上板部
４側板部
５側板部
６延長部
７切欠部
８側壁部
９段部
１０突起
１１絶縁基板
１２抵抗体
１３集電体
１４鳩目
１５端子
１５ａ先端部
１６端子
１６ａ先端部
１７端子
１７ａ先端部
１８空き端子
１８ａ先端部
１９操作部材
２０上壁部
２１側壁部
２２側壁部
２３保持部
２４つまみ部
２５固着部
２６止め板
２７平板部
２８摺動子
２９取付孔
３０導電部材
３１曲折部
３２係合爪部
３３静電気導出突片
３４天板部
３５スリット
３６位置決め突片
３７位置決め突片
３８回路基板
３９孔
４０導体パターン
４０ａランド部
４１導体パターン
４１ａランド部
４２接地用導体パターン
４２ａランド部
４３静電気導出突片[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a slide type variable resistor mounting structure in which a slide type variable resistor whose resistance value is changed by a slide operation is attached to a circuit board, and in particular, static electricity charged to an operator enters a resistor or a current collector. The present invention relates to a structure for preventing electrostatic discharge.
[0002]
[Prior art]
FIGS. 13 to 16 show a conventional mounting structure of a slide type variable resistor. The slide type variable resistor 51 includes a frame 52 having a U-shaped cross section with its lower and both ends open. Has a rectangular upper plate portion 53 and a pair of side plate portions 54 provided to face both edges of the upper plate portion 53 so as to extend in the longitudinal direction of the upper plate portion 53. As shown in FIG. 13, both ends of the frame 52 are each provided with an extension 55 having a U-shaped cross section that rises one step upward. A side wall 56 of the extension 55 has One end of the lower end is notched to form a stepped portion 57, and a protrusion 58 projects from the lower portion of the stepped portion 57.
[0003]
In this frame 52, a rectangular insulating substrate 59 is held with its lower surface facing downward. On the lower surface of this insulating substrate 59, a strip-shaped resistor 60 and a predetermined distance from this resistor 60 are placed. A current collector 61 extending in a strip shape along the resistor 60 is formed by printing or the like. Further, terminals 63 and 64 fixed to an insulating substrate 59 by eyelets 62 are connected to both ends of the resistor 60 and the current collector 61, respectively. 63 a and 64 a are bent parallel to the lower surface of the insulating substrate 59 and extended from the extension portion 55 to the outside of the frame 52.
[0004]
The slide-type variable resistor 51 includes an operation member 67 including a U-shaped holding portion 65 and a rectangular parallelepiped knob portion 66 provided continuously to the holding portion 65, a rectangular flat plate portion 68, and the like. 13 is provided with a conductive stop plate 70 formed of a pair of sliders 69 provided at one edge of the flat plate portion 68, and four pieces are provided below the holding portion 65 of the operation member 67 as shown in FIG. Are formed in the four corners of the flat plate portion 68 of the retaining plate 70.
[0005]
As shown in FIG. 14, the frame 52 is positioned in the holding portion 65 of the operation member 67, and the outer surface of the upper plate portion 53 of the frame 52 and the outer surfaces of the pair of side plate portions 54 are on the inner surface of the holding portion 65. The operation member 67 is in contact with the stopper plate 70 supported by the holding portion 65 by thermally melting the fixing portion 65a penetrating through the mounting hole 68a, and sandwiches the frame 52, thereby a pair of sliders. 69 is slidably supported by the frame 52 in a state in which it is in sliding contact with the resistor 60 and the current collector 61.
[0006]
In the slide type variable resistor 51 configured in this way, the tip portions 63a and 64a of the terminals 63 and 64 are respectively mounted on a circuit board 71 that constitutes an electric circuit by mounting an electric element (not shown) such as an IC or a capacitor. When the operator operates the knob portion 66 in the longitudinal direction (arrow B direction) of the frame 52 with the fingers while the current and voltage are applied between the terminals 63 and 63 while being soldered, a pair of operation members 67 are formed. When the pair of sliders 69 slide on the resistor 60 and the current collector 61, the resistor 60 and the current collector by the pair of sliders 69 are slid. The conduction position with respect to 61 changes, and current / voltage output corresponding to this conduction position is obtained from the tip 64 a of the terminal 64.
[0007]
[Problems to be solved by the invention]
However, in the conventional slide type variable resistor mounting structure described above, when static electricity charged by the operator is discharged to the knob portion 66 during manual operation of the knob portion 66, the static electricity is discharged to the knob portion 66. From the resistor 60, the current collector 61, the terminals 63 and 64, etc., through the path with the smallest insulation resistance, and the discharged static electricity flows into the IC mounted on the circuit board 71, the IC is destroyed. There was a fear that it was done.
[0008]
The present invention has been made in view of the above-described prior art, and an object thereof is to provide a highly reliable slide-type variable resistor mounting structure that can reliably discharge static electricity charged to an operator. That is.
[0009]
[Means for Solving the Problems]
As a first means for solving the above-mentioned problem, the present invention comprises a resistor and a current collector extending along the resistor at a predetermined interval from the resistor. Exposed on the bottom side A formed insulating substrate; It has an upper plate part and its lower surface side An insulating frame that holds an insulating substrate; a slider that is in sliding contact with and connected to the resistor and the current collector; and a slider that is slidably supported by the frame and that connects the resistor to the resistor. A slide type variable resistor composed of an operating member that slides on the current collector, and a circuit board on which a grounding conductor pattern is formed, It is formed of a conductive thin plate having a top plate portion, and the top plate portion covers the upper plate portion of the frame and is attached to the frame. Conductive member for flowing static electricity To the slide type variable resistor attachment, The frame is disposed between the insulating substrate and the conductive member, and the operation member is always in contact with the top plate portion of the conductive member regardless of the position of the slide operation, A part of the conductive member is made conductive or close to the grounding conductor pattern so that the slide type variable resistor is supported on the circuit board.
[0010]
Further, as a second means for solving the above-described problem, the present invention includes a resistor and a current collector extending along the resistor at a predetermined interval from the resistor. Exposed on the bottom side A formed insulating substrate; It has an upper plate part and its lower surface side An insulating frame that holds an insulating substrate; a slider that is in sliding contact with and connected to the resistor and the current collector; and a slider that is slidably supported by the frame and that connects the resistor to the resistor. A slide type variable resistor composed of an operating member that slides on the current collector, and a circuit board on which a grounding conductor pattern is formed, It is formed of a conductive thin plate having a top plate portion, and the top plate portion covers the upper plate portion of the frame and is attached to the frame. Conductive member for flowing static electricity To the slide type variable resistor attachment, The frame is disposed between the insulating substrate and the conductive member, and the operation member is always in contact with the top plate portion of the conductive member regardless of the position of the slide operation, An empty terminal is attached to the insulating substrate, the empty terminal is connected to the grounding conductor pattern, and a part of the conductive member is electrically connected to or close to the empty terminal so that the slide type variable resistor is connected to the circuit. The substrate was supported.
[0011]
Further, as a third means for solving the above-mentioned problem, in the first and second means, the present invention is configured such that a knob portion is provided on the operation member, and the knob portion is brought into contact with the conductive member. did.
[0013]
Also, to solve the above problems Fourth means As described above, the present invention Third means In this embodiment, the conductive member is provided with a slit through which the knob portion can protrude.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of a slide type variable resistor mounting structure according to the present invention will be described with reference to FIGS.
[0015]
The slide type variable resistor 1 has a structure in which the slide type variable resistor 1 is attached to the circuit board 38. The slide type variable resistor 1 includes a frame 2 made of an insulating synthetic resin, and an internal portion of the frame 2. An insulating substrate 11 held on the base plate, a stop plate 26 having a pair of sliders 28, an operation member 19 sandwiched between the stop plate 26 and supported by the frame 2 so as to be slidable, and attached to the frame 2. And a conductive member 30 to be formed.
[0016]
The frame 2 includes a housing having a U-shaped cross-section with the lower and both ends open, and includes a rectangular upper plate portion 3 and a lower surface of the upper plate portion 3 extending in the longitudinal direction of the upper plate portion 3. It has a pair of side-plate parts 4 and 5 provided facing both edges. As shown in FIG. 1, the frame 2 is provided with an extension 6 having a U-shaped cross section, which is raised one step upward, at both ends of the frame 2, and a notch 7 is formed in the extension 6. ing. Further, the side wall portion 8 of the extension portion 6 is cut out at one corner of the lower end thereof to form a step portion 9, and a protrusion 10 is projected from a lower portion 9 a of the step portion 9.
[0017]
The insulating substrate 11 is formed in a rectangular shape from an insulating synthetic resin material, and on its lower surface, a strip-shaped resistor 12 and a current collector 13 extending in a strip shape along the resistor 12 with a predetermined distance from the resistor 12. Are formed by printing or the like. Three terminals 15, 16, and 17 fixed to the upper surface of the insulating substrate 11 by eyelets 14 are connected to both ends of the resistor 12 and one end of the current collector 13, respectively. After the terminals 15, 16, and 17 are bent toward the lower surface side of the insulating substrate 11, the tip portions 15 a, 16 a, and 17 a are all bent parallel to the lower surface of the insulating substrate 11. Further, an empty terminal 18 which is electrically independent is attached to the upper surface of the other end portion of the insulating substrate 11, and the empty terminal 18 is insulated like the three terminals 15, 16, 18. After being bent to the lower surface side of the substrate 11, the tip end portion 18 a is bent in parallel to the lower surface of the insulating substrate 11. The insulating substrate 11 is formed in the frame 2 by extending the tip portions 15 a, 16 a, 17 a of the three terminals 15, 16, 17 and the tip portion 18 a of the empty terminal 18 from the extension portion 6 to the outside of the frame 2. Is retained.
[0018]
The operation member 19 is formed by molding an insulating synthetic resin material, and includes a rectangular upper wall portion 20 and a pair of side wall portions 21 and 22 erected facing the lower surface of the upper wall portion 20. 1 has a U-shaped holding portion 23 and a rectangular parallelepiped knob portion 24 connected to one side wall portion 22 of the holding portion 23. As shown in FIG. Four protrusion-like fixing portions 25 are formed in the lower portion of 22. The operation member 19 has the frame 2 positioned between the pair of side wall portions 21 and 22, and as shown in FIG. 8, the inner surface of the upper wall portion 20 and the pair of side wall portions 21 and 22 is connected to the upper plate of the frame 2. It is made to contact | abut to the outer surface of the part 3 and a pair of side-plate parts 4 and 5, respectively.
[0019]
The stopper plate 26 is formed in a rectangular shape from a conductive metal thin plate, and has a rectangular flat plate portion 27 and a pair of sliders 28 provided at one edge of the flat plate portion 27. Mounting holes 29 are formed in the four corners. The stop plate 26 is attached to the operation member 19 by thermally melting the fixing portions 25 respectively penetrating through the four attachment holes 29, and the stop plate 26 has a flat plate portion 27 having the operation member 19. The operation member 19 is slidably supported on the frame 2 with the pair of sliders 28 being in sliding contact with the resistor 12 and the current collector 13, respectively.
[0020]
The conductive member 30 is made of an iron rectangular conductive thin plate, and bent portions 31 are formed as shown in FIG. 1 by vertically bending both ends thereof downward. An L-shaped engaging claw portion 32 is provided at the lower portion of the bent portion 31, and one bent portion 31 is provided with an electrostatic discharge projecting piece 33 along with the engaging claw portion 32 at the lower portion. It has been. Further, a rectangular slit 35 is formed in the top plate portion 34 of the conductive member 30, and a pair of positioning protrusions 36 and 37 are provided opposite to each other at both ends of the top plate portion 34. . The conductive member 30 positions the positioning protrusion 36 in the notch 7 of the frame 2, and makes the inner surface of the positioning protrusion 37 abut against the outer surface of the side wall 8 of the extension portion 6. In the state where the positioning is performed, the engaging claw portion 32 is attached to the frame 2 by being hooked on the upper portion 9b of the step portion 9, and as shown in FIGS. The top plate portion 34 covers the entire outer surface, the bottom surface of the top plate portion 34 abuts on the upper wall portion 20 of the operation member 19, and the static electricity discharge protrusion 33 abuts on the empty terminal 18 supported by the insulating substrate 11. ing.
[0021]
On the other hand, the circuit board 38 to which the slide type variable resistor 1 configured in this way is attached is formed in a rectangular shape from an insulating synthetic resin material, and as shown in FIG. 6, the hole into which the projection 10 of the frame 2 is inserted. 39 is drilled. In addition, electrical elements (not shown) such as ICs and capacitors are mounted on the upper surface of the circuit board 38, and conductor patterns 40 and 41 that constitute an electrical circuit (not shown) connected to the electrical elements, A grounding conductor pattern 42 to be grounded to the ground of the electric circuit (not shown) is formed. The conductor pattern 40 is provided with a land portion 40a to which the tip end portion 15a of the terminal 15 is connected, and the conductor pattern 41 is provided with a land portion 41a to which the tip portions 16a and 17a of the terminals 16 and 17 are connected. Is provided. The conductor pattern grounding conductor pattern 42 is provided with a land portion 42a to which the tip end portion 18a of the empty terminal 18 is connected.
[0022]
Next, a method for assembling the slide type variable resistor mounting structure will be described. First, three terminals 15, 16, 17 and empty terminals 18 are formed on the insulating substrate 11 on which the resistor 12 and the current collector 13 are formed. To fix. Next, the insulating substrate 11 is held in the frame 2 by caulking the edge of the insulating substrate 11 to the inner surfaces of the pair of side plate portions 4 and 5. Next, the frame 2 is positioned between the pair of side wall portions 21 and 22 of the operation member 19, and the operation member 19 and the frame 2 are combined. In this state, the attachment holes 29 of the stopper plate 26 are inserted into the four fixing portions 25. Then, the stopper plate 26 is attached to the operation member 19 by thermally melting these fixing portions 25. Next, when the conductive member 30 was put on the upper part of the frame 2 so that the positioning protrusions 36 corresponded to the notches 7 of the frame 2, the engaging claw portions 32 collided with the edge of the extension 6 of the frame 2. When the conductive member 30 is pushed downward in this state, the engaging claw portion 32 bends outward due to the elasticity of the conductive member 30, and the front end of the engaging claw portion 32 is the upper portion 9b of the step portion 9 of the extension portion 6. At this time, the engaging claw 32 is restored to the original state, the engaging claw 32 is hooked on the upper portion 9b of the stepped portion 9, and the conductive member 30 is attached to the frame 2.
[0023]
Thereafter, when the slide-type variable resistor 1 assembled in this way is placed on the upper surface of the circuit board 38 with the protrusion 10 inserted through the hole 39, the tip 15a of the terminal 15 contacts the land 40a. The tip portions 16a and 17a of the terminals 16 and 17 are in contact with the land portion 41a, and the tip portion 18a of the empty terminal 18 is in contact with the land portion 42a. In this state, the slide type variable resistor 1 is attached to the circuit board 8 by connecting the tip portions 15a, 16a, 17a, and 18a to the land portions 40a, 41a, and 42a using solder (not shown).
[0024]
In this way, the assembly of the slide type variable resistor mounting structure is completed, but after assembly, the pair of sliders 28 are in sliding contact with the resistor 12 and the current collector 13, respectively, and the stop plate 26 is the resistor. 12 and the current collector 13 are electrically connected, and the operation member 19 always has the top wall portion 34 of the conductive member 30 regardless of the position of the upper wall portion 20 of the holding portion 23 in the sliding motion of the operation member 19. It comes in contact with the lower surface. In addition, the conductive member 30 and the grounding conductor pattern 41 are electrically connected through the static electricity deriving protrusion 33 and the empty terminal 18 and are in a conductive state.
[0025]
Further, as shown in FIG. 5, the extension portion 6 of the frame 2 faces the both end surfaces of the pair of side wall portions 21 and 22 of the operation member 19, and the operation member 19 is positioned at both ends of the upper plate portion 34. The extension portion 6 abuts against both end surfaces of the pair of side wall portions 21 and 22 so as to regulate the slide of the operation member 19 within the range of the upper plate portion 34. It has two functions: a function of supporting the conductive member 30 on the frame 2 by stopping, and a stopper function of defining the sliding range of the operation member 19.
[0026]
Thus, in the mounting structure of the slide type variable resistor constructed and assembled in this way, the electric circuit (not shown) formed on the upper surface of the circuit board 38 is connected between the terminals 16 and 17 via the conductor pattern 41. When the operator operates the knob portion 24 in the longitudinal direction of the frame 2 (arrow A direction) with a finger while a predetermined current and voltage are applied to the operation member 19, the operation member 19 slides integrally with the pair of sliders 28. When the pair of sliders 28 slide on the resistor 12 and the current collector 13, the conduction position between the resistor 12 and the current collector 13 by the pair of sliders 28 changes. A current / voltage output corresponding to the conduction position is obtained from the tip 15a of the terminal 15, and the current / voltage output thus obtained is transmitted through the conductor pattern 40 to which the tip 15a of the terminal 15 is connected. Derived to an electric circuit (not shown) It has become to so that.
[0027]
Since the knob portion 24 and the conductive member 30 are close to each other, the creepage distance is short, and the distance between the static electricity leading protrusion 33 and the empty terminal 18 is short. The insulation resistance between them is smaller than the insulation resistance between the knob portion 24 and the terminals 15, 16, and 17. Accordingly, when static electricity charged to the operator is discharged to the knob portion 24 during manual operation of the knob portion 24, the static electricity is discharged from the knob portion to the holding portion 23, the top plate portion 34 of the conductive member 30, and the static electricity deriving protruding piece. 33, is transmitted to the empty terminal 18 and led to the grounded conductor pattern 42. Therefore, the static electricity discharged to the knob portion 24 flows into the grounding conductor pattern 42 through the holding portion 23, the top plate portion 34 of the conductive member 30, the static electricity deriving protrusion 33, and the empty terminal 18, and the terminals 15, The IC (not shown) mounted on the upper surface of the circuit board 38 can be completely prevented from being broken by static electricity.
[0028]
In the above-described embodiment, the structure has been described in which the static electricity projecting protrusion 33 that is a part of the conductive member 30 and the empty terminal 18 are in contact with each other. It is good also as a structure which made the static electricity extraction protrusion 33 and the empty terminal 18 adjoin so that a micro gap might be formed between the static electricity extraction protrusion 33 and the empty terminal 18 within the range which does not discharge to another member. .
[0029]
In the above embodiment, the upper wall portion 20 of the operation member 19 is in contact with the lower surface of the top plate portion 34 of the conductive member 30, but the knob portion 24 is directly connected to the top plate portion 34 of the conductive member 30. The knob portion 24 may always be in contact with the lower surface of the top plate portion 34 of the conductive member 30 regardless of the position of the operation member 19 in the sliding motion. Since the static electricity is directly transmitted from the knob portion 24 to the conductive member 30, the static electricity can flow into the grounding conductor pattern 42 more reliably. In addition, it is only necessary to provide the cutout portion 7 in the conventional variable resistor and attach the conductive member 30, and it is easily possible without changing the round shape of the circuit pattern.
[0030]
Next, FIG. 9 shows a second embodiment of the present invention. The difference of the second embodiment from the first embodiment is that the empty terminal 18 is removed, and instead, the electrostatic discharge projecting piece 33. Is formed as a static electricity deriving protrusion 43, which is directly connected to the land portion 42a of the grounding conductor pattern 42 by solder (not shown), and the others are the above-mentioned. This is the same as the first embodiment. In this case, when static electricity charged by the operator is discharged to the knob portion 24, the static electricity is transmitted from the knob portion 24 to the holding portion 23, the top plate portion 34 of the conductive member 30, and the static electricity deriving protrusion 43, and grounded The grounded conductor pattern 42 is led out.
[0031]
In the second embodiment configured as described above, since the static electricity deriving protrusion 43 is longer than the static electricity extracting protrusion 33 of the first embodiment, the iron conductive material serving as the base material of the conductive member 30 is used. Although the amount of use of the thin plate increases, the number of parts can be reduced by the amount by which the empty terminal 18 can be removed. In the second embodiment, the static electricity is not connected to the land portion 42a of the grounding conductor pattern 42, and the static electricity is transferred from the static electricity discharge protrusion 43 to another member such as the terminal 16 in the vicinity. It is also possible to adopt a configuration in which the electrostatic discharge projecting piece 43 and the land portion 42a are close to each other so that a minute gap is formed between the electrostatic discharge projecting piece 43 and the land portion 42a within a range where no discharge occurs.
[0032]
In the second embodiment, the upper wall portion 20 of the operation member 19 is in contact with the lower surface of the top plate portion 34 of the conductive member 30, but the knob portion 24 is directly connected to the conductive member 30. The knob portion 24 may be brought into contact with the lower surface of the top plate portion 34 so that the knob portion 24 is always in contact with the lower surface of the top plate portion 34 of the conductive member 30 regardless of the position of the operation member 19 in the sliding operation. In this case, since the static electricity is directly transmitted from the knob portion 24 to the conductive member 30, the static electricity can flow into the grounding conductor pattern 42 more reliably.
[0033]
FIGS. 10 to 11 show a third embodiment of the present invention. The third embodiment is different from the first embodiment in that the knob portion 24 is replaced with the side wall portion 22 and the upper wall portion. The knob portion 24 is protruded from a slit 35 formed in the top plate portion 34 of the conductive member 30 so that the knob portion 24 can be operated above the top plate portion 34. This is the same as in the first embodiment.
[0034]
In the third embodiment configured as described above, the knob portion 24 can be operated above the top plate portion 34 of the conductive member 30 only by changing the formation position of the knob portion 24. The product can have variations. The conductive member 30 is configured such that the knob portion 24 as shown in the first embodiment is operated on the side of the conductive member 30 and the knob portion 24 as shown in the third embodiment is connected to the conductive member 30. Can be used in common without changing the shape and configuration, and can be manufactured in the same process.
[0035]
FIG. 12 shows a fourth embodiment of the present invention. This fourth embodiment is a combination of the second and third embodiments, and the fourth embodiment is the first embodiment. The difference from the configuration is that the empty terminal 18 is removed, and instead, a static electricity deriving projection piece 33 is extended to form a static electricity deriving projection piece 43, which is directly connected to the grounding conductor by solder (not shown). The point connected to the land portion 42 a of the pattern 42 and being conducted, and the knob portion 24 are provided in the upper wall portion 20 instead of the side wall portion 22, and the knob portion 24 is formed in the top plate portion 34 of the conductive member 30. This is the same as the first embodiment except that the knob portion 24 is protruded from the slit 35 so that the knob portion 24 can be operated above the top plate portion 34.
[0036]
In the second embodiment configured as described above, the number of parts can be reduced by the amount that the empty terminal 18 can be removed, and the knob is formed above the conductive member 30 only by changing the position where the knob portion 24 is formed. The portion 24 can be operated, and the conductive member 30 can be shared by the one that operates the knob portion 24 on the side of the conductive member 30 and the one that operates the knob portion 24 above the conductive member 30. Can be achieved.
[0037]
【The invention's effect】
The present invention is implemented in the form as described above, and has the following effects.
[0038]
A resistor and a current collector extending along the resistor at a predetermined interval from the resistor; Exposed on the bottom side A formed insulating substrate; It has an upper plate part and its lower surface side An insulating frame that holds an insulating substrate; a slider that is in sliding contact with and connected to the resistor and the current collector; and a slider that is slidably supported by the frame and that connects the resistor to the resistor. A slide type variable resistor composed of an operation member that slides on the current collector, and a circuit board on which a grounding conductor pattern is formed, It is formed of a conductive thin plate having a top plate portion, and the top plate portion covers the upper plate portion of the frame and is attached to the frame. Conductive member for flowing static electricity To the slide type variable resistor attachment, The frame is disposed between the insulating substrate and the conductive member, and the operation member is always in contact with the top plate portion of the conductive member regardless of the position of the slide operation, Since a part of the conductive member is made conductive or close to the grounding conductor pattern and the slide type variable resistor is supported on the circuit board, static electricity charged to the operator is passed through the conductive member through the grounding conductor. It is possible to provide a highly reliable slide type variable resistor mounting structure that can surely escape the pattern.
[0039]
In addition, a resistor and a current collector extending along the resistor at a predetermined interval from the resistor Exposed on the bottom side A formed insulating substrate; It has an upper plate part and its lower surface side An insulating frame that holds an insulating substrate; a slider that is in sliding contact with and connected to the resistor and the current collector; and a slider that is slidably supported by the frame and that connects the resistor to the resistor. A slide type variable resistor composed of an operation member that slides on the current collector, and a circuit board on which a grounding conductor pattern is formed, It is formed of a conductive thin plate having a top plate portion, and the top plate portion covers the upper plate portion of the frame and is attached to the frame. Conductive member for flowing static electricity To the slide type variable resistor attachment, The frame is arranged between the insulating substrate and the conductive member, and the operation member is always brought into contact with the top plate portion of the conductive member regardless of the position of the slide operation, An empty terminal is attached to the insulating substrate, the empty terminal is connected to the grounding conductor pattern, and a part of the conductive member is electrically connected to or close to the empty terminal, whereby the slide type variable resistor is connected to the circuit. Since it is supported on the substrate, static electricity charged to the operator can be surely released to the grounding conductor pattern through the conductive member and the empty terminal, and a highly reliable mounting structure of the slide type variable resistor is provided. it can.
[0040]
Further, since the knob portion is provided on the operation member, and the knob portion is brought into contact with the conductive member, static electricity is directly transmitted from the knob portion to the conductive member, so that the static electricity is surely released by the grounding conductor pattern. Can do.
[0041]
In addition, since the conductive member is formed of an iron conductive flat plate and is attached to the frame so as to cover one surface of the frame, the knob portion is always attached regardless of the position of the operation member 19 in the sliding operation. It can be brought into contact with the conductive member, and static electricity can be surely released to the grounding conductor pattern at an arbitrary position within the sliding range of the operation member.
[0042]
In addition, since the conductive member is provided with a slit through which the knob portion can project, the slide type variable resistor is provided with product variations after taking measures against static electricity to surely release the static electricity to the grounding conductor pattern. Can do.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a slide type variable resistor according to a slide type variable resistor mounting structure of a first embodiment of the present invention.
FIG. 2 is a plan view of the slide type variable resistor according to the slide type variable resistor mounting structure of the first embodiment of the present invention.
FIG. 3 is a front view of the slide type variable resistor according to the mounting structure of the slide type variable resistor of the first embodiment of the present invention.
FIG. 4 is a side view of the slide type variable resistor according to the slide type variable resistor mounting structure of the first embodiment of the present invention.
FIG. 5 is a rear view of the slide type variable resistor according to the mounting structure of the slide type variable resistor of the first embodiment of the present invention.
FIG. 6 is a plan view of a circuit board according to the mounting structure of the slide type variable resistor of the present invention.
FIG. 7 is a longitudinal sectional view of a slide type variable resistor mounting structure according to the first embodiment of the present invention.
FIG. 8 is a cross-sectional view of the slide type variable resistor mounting structure according to the first embodiment of the present invention.
FIG. 9 is a longitudinal sectional view of a mounting structure for a slide type variable resistor according to a second embodiment of the present invention.
FIG. 10 is a perspective view of an operation member according to a slide type variable resistor mounting structure according to a third embodiment of the present invention.
FIG. 11 is a cross-sectional view of a slide type variable resistor mounting structure according to a third embodiment of the present invention.
FIG. 12 is a longitudinal sectional view of a slide type variable resistor mounting structure according to a fourth embodiment of the present invention.
FIG. 13 is an exploded perspective view of a slide-type variable resistor according to a conventional slide-type variable resistor mounting structure.
FIG. 14 is a rear view of a slide type variable resistor according to a mounting structure of a conventional slide type variable resistor.
FIG. 15 is a cross-sectional view of a conventional slide type variable resistor mounting structure.
FIG. 16 is a longitudinal sectional view of a conventional slide type variable resistor mounting structure.
[Explanation of symbols]
1 Slide type variable resistor
2 frames
3 Upper plate
4 Side plate
5 Side plate
6 Extension
7 Notch
8 Side wall
9 steps
10 protrusion
11 Insulating substrate
12 resistors
13 Current collector
14 Eyelet
15 terminals
15a Tip
16 terminals
16a tip
17 terminals
17a Tip
18 Free terminals
18a Tip
19 Operation members
20 Upper wall
21 Side wall
22 Side wall
23 Holding part
24 Knob
25 Adhering part
26 Stop plate
27 Flat part
28 Slider
29 Mounting hole
30 Conductive member
31 Turned part
32 engaging claw
33 Electrostatic lead piece
34 Top plate
35 slits
36 Positioning protrusion
37 Positioning protrusion
38 Circuit board
39 holes
40 Conductor pattern
40a Land
41 Conductor pattern
41a Land
42 Grounding conductor pattern
42a Land
43 Static electricity lead

Claims

An insulating substrate formed by exposing a resistor and a current collector extending along the resistor at a predetermined interval to the lower surface, and having an upper plate portion on the lower surface An insulating frame for holding the slider, a slider that slides against and connects the resistor and the current collector, and a slider that is slidably supported by the frame and that connects the resistor and the collector. And a circuit board on which a grounding conductor pattern is formed, and is formed of a conductive thin plate having a top plate portion. A plate member covers the upper plate portion of the frame and is attached to the slide type variable resistor to be attached to the frame, and the frame is disposed between the insulating substrate and the conductive member. And slide the operation member Regardless of the position of the work, always with contacting the top plate portion of the conductive member, said part of the conductive member is conductive or close to the ground conductor pattern, the sliding-type variable resistor to the circuit board A mounting structure of a slide type variable resistor characterized by being supported.

An insulating substrate formed by exposing a resistor and a current collector extending along the resistor at a predetermined interval to the lower surface, and having an upper plate portion on the lower surface An insulating frame for holding the slider, a slider that slides against and connects the resistor and the current collector, and a slider that is slidably supported by the frame and that connects the resistor and the collector. And a circuit board on which a grounding conductor pattern is formed, and is formed of a conductive thin plate having a top plate portion. A plate member covers the upper plate portion of the frame and is attached to the slide type variable resistor to be attached to the frame, and the frame is disposed between the insulating substrate and the conductive member. And slide the operation member Regardless of the position of the work, always with contacting the top plate portion of the conductive member, the insulating mounting the unused terminals on the substrate, as well as connecting the free terminal to the grounding conductor pattern, a portion of said conductive member The slide type variable resistor mounting structure is characterized in that the slide type variable resistor is supported on the circuit board by conducting or in close proximity to the empty terminal.

The slide type variable resistor mounting structure according to claim 1 or 2, wherein a knob portion is provided on the operation member, and the knob portion is brought into contact with the conductive member.

4. The slide type variable resistor mounting structure according to claim 3, wherein the conductive member is provided with a slit through which the knob portion can protrude .