JP3815280B2

JP3815280B2 - Instrument

Info

Publication number: JP3815280B2
Application number: JP2001294450A
Authority: JP
Inventors: 秀行中根
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2001-09-26
Filing date: 2001-09-26
Publication date: 2006-08-30
Anticipated expiration: 2021-09-26
Also published as: JP2003111379A

Description

【０００１】
【発明の属する技術分野】
本発明は、ステップモータを駆動源として用いる計器に関するものである。
【０００２】
【従来の技術】
従来、例えば、乗用車用計器においては、その指針の駆動源としてステップモータを用いたものがある。ここで、ステップモータは、ステータと、マグネットロータとにより構成される。そして、このステップモータが、例えば、２相式のものであるとすれば、ステータは、マグネットロータと共に磁気回路を形成する環状のヨーク及び両コイル素子を有する。
【０００３】
【発明が解決しようとする課題】
ところで、上記計器では、そのステップモータのステータは、図９及び図１０にて示すような環状のヨーク１と、一対のコイル素子２（図１０では一方のコイル素子のみを示す）とを備えている。ヨーク１は、ヨーク部１ａと、このヨーク部１ａから二股状に延出する両ヨーク部１ｂ、１ｃとにより構成されており、当該両ヨーク部１ｂ、１ｃは、指針を支持する指針軸の両側に位置している。
【０００４】
ここで、指針が発光指針である場合、この発光指針に光を入射する複数の光源を指針軸の軸周りに容易に配置できるようにするためには、コイル素子２を、両ヨーク部１ｃ内に支持するとともに、コイル素子２の両ターミナルを、図１０にて各符号２ａで例示するごとく、ボビン２ｂの軸方向両端部の図１０にて各図示下部に設けるようにする必要がある。
【０００５】
しかし、このように両ターミナル２ａをボビン２ｂに設けようとすると、ボビン２ｂの軸方向長さが、ボビンの軸方向一端部に両ターミナル２ａを設ける場合に比べて、長くなってしまう。従って、コイル素子２をヨーク部１ｃの支持ロッド１ｄに支持するために、図１０にて示すようにコイル素子２をヨーク１内に嵌め込もうとするとき、ヨーク部１ａの内壁１ｅが図９及び図１０にて示すごとく円弧面状に形成されていると、ボビン２ｂの軸方向両端部の一方が、ヨーク部１ａの内壁１ｅと干渉し、ヨーク１内にはめ込めないという不具合が生ずる。
【０００６】
これに対しては、ボビン２ｂの軸方向長さを短くすることが考えられるが、この場合には、ボビン２ｂに対する巻き線のコイルとしての巻き数が不足するという不具合を招く。
【０００７】
そこで、本発明は、以上のようなことに対処するため、ステータのヨークの形状に工夫を凝らし、コイル素子のコイルとしての巻き線の巻き数を適正に確保しつつ、当該コイル素子のヨークに対する組み付けを円滑にするようにしたステップモータを用いる計器を提供することを目的とする。
【０００８】
【課題を解決するための手段】
上記課題の解決にあたり、請求項１に記載の発明は、発光指針（１３０）に光を入射する複数の光源（１４０）が指針軸（Ｄｂ）の軸周りに配置され、ステップモータによって指針軸が回動されるようにした計器であって、ステップモータは、ヨーク（Ｙ）並びに第１及び第２のコイル素子（Ｃａ、Ｃｂ）を有するステータ（Ｓ）と、マグネットロータ（Ｒ）とを備え、ヨークは、第１ヨーク部（４０）と、この第１ヨーク部から二股状に延出する第２及び第３のヨーク部（５０、６０）とでもって、環状に形成されており、第１ヨーク部は、長手状連結部（４１）と、この連結部の長手方向両端から延出する両腕部（４２、４３）とを備え、第２ヨーク部は、両腕部の一方（４３）の内壁（４３ａ）に向けて延出する支持ロッド（５４）を有するとともに、第３ヨーク部は、両腕部の他方（４２）の内壁（４２ａ）に向けて延出する支持ロッド（６４）を有しており、マグネットロータは、その外周面にて、第１ヨーク部の連結部及び両腕部の各内壁並びに両支持ロッドの各先端部に対向するようにヨーク内に回転可能に支持されており、第１コイル素子（Ｃａ）は、第２ヨーク部の支持ロッドに同軸的に支持される筒状ボビン（７０）と、このボビンにその軸方向両端部（７０ｂ、７０ｃ）の間にてソレノイド状に巻装されてマグネットロータ及びヨークと共に磁気回路を形成するコイル（９０）とを有するとともに、第２コイル素子（Ｃｂ）は、第３ヨーク部の支持ロッドに同軸的に支持される筒状ボビン（１００）と、このボビンにその軸方向両端部（１００ｂ、１００ｃ）の間にてソレノイド状に巻装されてマグネットロータ及びヨークと共に磁気回路を形成するコイル（１２０）とを有しており、第１コイル素子のボビンは、軸方向両端部のうちマグネットロータの外周面から遠い側の軸方向一端部に２つのターミナル部（７１ａ）を有するとともに軸方向他端部に２つのターミナル部（７２ａ）を有し、この第１コイル素子のボビンにおいて、軸方向一端部の２つのターミナル部と軸方向他端部の２つのターミナル部は、ボビンの軸方向でボビンの外側に向けて互いに反対方向に突出しており、第２コイル素子のボビンは、軸方向両端部のうちマグネットロータの外周面から遠い側の軸方向一端部に２つのターミナル部（１０１ａ）を有するとともに軸方向他端部に２つのターミナル部（１０２ａ）を有し、この第２コイル素子のボビンにおいて、軸方向一端部の２つのターミナル部と軸方向他端部の２つのターミナル部は、ボビンの軸方向でボビンの外側に向けて互いに反対方向に突出しており、第１ヨーク部の一方の腕部の内壁は第２ヨーク部の支持ロッドの軸に直角な平面状の内壁であり、第１ヨーク部の他方の腕部の内壁は第３ヨーク部の支持ロッドの軸に直角な平面状の内壁であることを特徴とする。
【０００９】
このように、第１ヨーク部の両腕部の内壁は平面状に形成されているため、第１コイル素子のボビンの軸方向端部と第１ヨーク部の一方の腕部との干渉を招くことなく、第１コイル素子を第１ヨーク部の一方の腕部と第２ヨーク部との間に確実にかつ円滑に嵌め込むことができ、また、第２コイル素子のボビンの軸方向端部と第１ヨーク部の他方の腕部との干渉を招くことなく、第２コイル素子を第１ヨーク部の他方の腕部と第３ヨーク部との間に確実にかつ円滑に嵌め込むことができる。然る後は、第１コイル素子をそのボビンにて第２ヨーク部の支持ロッドに同軸的に外方から嵌装し、第２コイル素子をそのボビンにて第３ヨーク部の支持ロッドに同軸的に外方から嵌装することで、第１及び第２の各コイル素子を第２及び第３のヨーク部内に支持することができる。
【００１０】
ここで、上述のように第１ヨーク部の両腕部の各内壁を平面状に形成したので、各ボビンの軸方向長さを適正に確保することができ、その結果、各コイル素子のコイルとしての巻き線の巻き数も適正に確保し得る。
【００１１】
また、請求項２に記載の発明では、請求項１に記載の計器において、マグネットロータの軸が指針軸となっており、第１コイル素子において、コイルは、その両端子部にて、当該第１コイル素子のボビンの軸方向一端部の２つのターミナル部に設けた両ターミナル（８０）に接続されるとともに、第２コイル素子において、コイルは、その両端子部にて、当該第２コイル素子のボビンの軸方向一端部の２つのターミナル部に設けた両ターミナル（１１０）に接続されていることを特徴とする。
また、請求項３に記載の発明では、発光指針（１３０）に光を入射する複数の光源（１４０）が指針軸（Ｄｂ）の軸周りに配置され、ステップモータによって指針軸が回動されるようにした計器であって、ステップモータは、ヨーク（Ｙ）並びに第１及び第２のコイル素子（Ｃａ、Ｃｂ）を有するステータ（Ｓ）と、マグネットロータ（Ｒ）と、減速歯車列（Ｇ）とを備え、ヨークは、第１ヨーク部（４０）と、この第１ヨーク部から二股状に延出する第２及び第３のヨーク部（５０、６０）とでもって、環状に形成されており、第１ヨーク部は、長手状連結部（４１）と、この連結部の長手方向両端から延出する両腕部（４２、４３）とを備え、第２ヨーク部は、両腕部の一方（４３）の内壁（４３ａ）に向けて延出する支持ロッド（５４）を有するとともに、第３ヨーク部は、両腕部の他方（４２）の内壁（４２ａ）に向けて延出する支持ロッド（６４）を有しており、マグネットロータは、その外周面にて、第１ヨーク部の連結部及び両腕部の各内壁並びに両支持ロッドの各先端部に対向するようにヨーク内に回転可能に支持されており、減速歯車列は、マグネットロータとその軸にて同軸的に支持される入力段歯車（Ｇ１）と、マグネットロータの軸に平行な出力軸に同軸的に支持される出力段歯車（Ｇ３）とを備え、出力段歯車の出力軸が指針軸となっており、第１コイル素子（Ｃａ）は、第２ヨーク部の支持ロッドに同軸的に支持される筒状ボビン（７０）と、このボビンにその軸方向両端部（７０ｂ、７０ｃ）の間にてソレノイド状に巻装されてマグネットロータ及びヨークと共に磁気回路を形成するコイル（９０）とを有するとともに、第２コイル素子（Ｃｂ）は、第３ヨーク部の支持ロッドに同軸的に支持される筒状ボビン（１００）と、このボビンにその軸方向両端部（１００ｂ、１００ｃ）の間にてソレノイド状に巻装されてマグネットロータ及びヨークと共に磁気回路を形成するコイル（１２０）とを有しており、第１コイル素子において、コイルは、その一側端子部にて、第１コイル素子のボビンの軸方向両端部の一方のうち指針軸から遠く離れたターミナル部（７１ａ）に設けたターミナル（８０）に接続され、その他側端子部にて、第１コイル素子のボビンの軸方向両端部の他方のうち指針軸から遠く離れた他のターミナル部（７２ａ）に設けた他のターミナル（８０）に接続され、ターミナル部と他のターミナル部は、ボビンの軸方向でボビンの外側に向けて互いに反対方向に突出しており、第２コイル素子において、コイルは、その一側端子部にて、第２コイル素子のボビンの軸方向両端部の一方のうち指針軸から遠く離れたターミナル部（１０１ａ）に設けたターミナル（１１０）に接続され、その他側端子部にて、第２コイル素子のボビンの軸方向両端部の他方のうち指針軸から遠く離れた他のターミナル部（１０２ａ）に設けた他のターミナル（１１０）に接続され、ターミナル部と他のターミナル部は、ボビンの軸方向でボビンの外側に向けて互いに反対方向に突出しており、第１ヨーク部の一方の腕部の内壁は第２ヨーク部の支持ロッドの軸に直角な平面状の内壁であり、第１ヨーク部の他方の腕部の内壁は第３ヨーク部の支持ロッドの軸に直角な平面状の内壁であることを特徴とする。
【００１２】
このように、ステップモータが減速歯車列を有するものであっても、請求項１に記載の発明と実質的に同様の作用効果を達成できる。
【００１３】
また、請求項４に記載の発明によれば、請求項１ないし３のいずれか１つに記載の計器において、第１コイル素子は、そのボビンにて、第１ヨーク部の一方の腕部の平面状内壁と第２ヨーク部の支持ロッドの先端部との間にこの支持ロッドと同軸的に位置するように嵌め込まれた後に、当該支持ロッドに沿い外方から嵌装されてこの支持ロッドに同軸的に支持され、一方、第２コイル素子は、そのボビンにて、第１ヨーク部の他方の腕部の平面状内壁と第３ヨーク部の支持ロッドの先端部との間にこの支持ロッドと同軸的に位置するように嵌め込まれた後に、当該支持ロッドに沿い外方から嵌装されてこの支持ロッドに同軸的に支持されることを特徴とする。これにより、請求項１ないし３に記載の発明の作用効果をより一層確実に達成できる。
【００１４】
また、請求項５に記載の発明は、請求項１ないし４のいずれか１つに記載の計器において、目盛り盤（１０）と、この目盛り盤にその裏面側にて並行に設けた配線板（２０）と、この配線板の裏面側に設けられた内機本体（Ｄａ）とを備え、内機本体は、ステップモータを有しており、指針軸は、内機本体から配線板及び目盛り盤の各貫通穴部（２１、１１）を通り回動可能に延出しており、発光指針は、指針軸の先端部に回動基部（１３１）にて支持されて目盛り盤の表面に並行に位置しており、複数の光源は、指針軸の軸周り近傍にて配線板の表面に間隔をおいて配設されて配線板の貫通穴部を通り発光指針の回動基部に光を入射することを特徴とする。
【００１５】
これにより、請求項１ないし４のいずれか１つに記載の発明の作用効果を達成し得る計器の提供が可能となる。
【００１６】
なお、上記各手段の括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示すものである。
【００１７】
【発明の実施の形態】
以下、本発明の一実施形態を図面により説明する。図１は本発明に係る乗用車用計器の一例を示しており、この計器は、当該乗用車の車室内に設けたインストルメントパネルに配設されている。
【００１８】
当該計器は、図１にて示すごとく、目盛り盤１０と、この目盛り盤１０にその裏面側にて並行に位置する配線板２０と、回動内機Ｄとを備えている。回動内機Ｄは、内機本体Ｄａと、この内機本体Ｄａから配線板２０の貫通穴部２１及び目盛り盤１０の貫通穴部１１を通り回動可能に延出する指針軸Ｄｂとにより構成されている。ここで、配線板２０は、図１にて示すごとく、内機本体Ｄａの上端面にこれに沿うように支持されている。
【００１９】
内機本体Ｄａは、図１にて示すように、ケーシング３０を備えており、このケーシング３０は、図１乃至図３から分かるように、断面コ字状の上下両側ケーシング部材３０ａ、３０ｂをその各開口部にて組み合わせて構成されている。当該ケーシング３０は、そのケーシング部材３０ａの上壁３１（以下、ケーシング３０の上壁３１ともいう）にて、複数のねじにより配線板２０にその裏面側から締着されている。
【００２０】
また、内機本体Ｄａは、図２にて示すごとく、ケーシング３０内に組み付けたステップモータＭ及び減速歯車列Ｇを備えている。ステップモータＭは、ステータＳと、マグネットロータＲとにより構成されている。ステータＳは、環状ヨークＹと、両コイル素子Ｃａ、Ｃｂとを備えており、ヨークＹは、ケーシング３０内にその底壁３２（以下、ケーシング３０の底壁３２ともいう）に沿い移動不能に収容固定されている。
【００２１】
また、ヨークＹは、図２にて示すごとく、略コ字状の各ヨーク部４０乃至６０からなるもので、両ヨーク部５０、６０は、図２及び図４にて示すごとく、ヨーク部４０から所定の開き角度（例えば、９０度）にて二股状に延出するように一体に形成されている。
【００２２】
ヨーク部４０は、連結部４１の長手方向両端の各々から各腕部４２、４３をそれぞれ延出することで略コ字状に形成されている。連結部４１は、突起４１ｂを備えており、この突起４１ｂは、断面四角形状にて、連結部４１の内壁４１ａの長手方向中央からこの内壁４１ａに直角に突出している。
【００２３】
各腕部４２、４３は、図２及び図４にて示すごとく、連結部４１の内壁４１ａの長手方向中央に対する法線を基準に互いに対称的な形状を有している。腕部４２の内壁４２ａは平面状に形成されており、この平面状内壁４２ａは、ヨーク部６０の支持ロッド６４（後述する）の軸方向に直角に位置するように、ヨーク部６０に対向している。当該腕部４２は、突起４２ｂを備えており、この突起４２ｂは、断面四角形状にて、腕部４２の内壁４２ａの長手方向中央から当該内壁４２ａに直角に突出し支持ロッド６４にこれと同軸的に対向している。
【００２４】
一方、腕部４３の内壁４３ａは平面状に形成されており、この平面状内壁４３ａは、ヨーク部５０の支持ロッド５４（後述する）の軸方向に直角に位置するように、ヨーク部５０に対向している。当該腕部４３は、突起４３ｂを備えており、この突起４３ｂは、断面四角形状にて、腕部４３の内壁４３ａの長手方向中央から当該内壁４３ａに直角に突出し支持ロッド５４にこれと同軸的に対向している。なお、各突起４１ｂ、４２ｂ、４３ｂは、ヨーク部４０の開口部にて各腕部４２、４３に形成した各突起４２ｃ、４３ｃ及び両ヨーク部５０、６０に共通の突起５３ａ（後述する）と共に、ヨークＹの各磁極（以下、各磁極４１ｂ、４２ｂ、４３ｂ、４２ｃ、４３ｃ、５３ａともいう）を構成する。また、磁極４２ｂの腕部４２の長手方向に沿う幅は、磁極４３ｂの腕部４３の長手方向に沿う幅に等しい。
【００２５】
ヨーク部５０は、連結部５１の長手方向両端の各々から各腕部５２、５３をそれぞれ延出することで略コ字状に形成されている。連結部５１は、支持ロッド５４を備えており、この支持ロッド５４は、断面四角状にて、連結部５１の平面状内壁５１ａの長手方向中央から突起４３ｂに向け延出している。ここで、支持ロッド５４の断面形状は、突起４３ｂの断面四角形状と同一となっており、支持ロッド５４の先端面は、当該支持ロッド５４の軸方向からみて突起４３ｂの先端面と重畳的に一致する。
【００２６】
各腕部５２、５３は、図４にて示すごとく、連結部５１の内壁５１ａの長手方向中央に対する法線（即ち、支持ロッド５４の軸）を基準に対称的な形状を有しており、腕部５２は、その先端部にて、ヨーク部４０の腕部４２の先端部と一体になっている。
【００２７】
ヨーク部６０は、連結部６１の長手方向両端の各々から各腕部６２、６３をそれぞれ延出することで略コ字状に形成されている。連結部６１は、支持ロッド６４を備えており、この支持ロッド６４は、断面四角状にて、連結部６１の平面状内壁６１ａの長手方向中央から突起４２ｂに向け延出している。ここで、支持ロッド６４の断面形状は、突起４２ｂの断面四角形状と同一となっており、支持ロッド６４の先端面は、当該支持ロッド６４の軸方向からみて突起４２ｂの先端面と重畳的に一致する。
【００２８】
各腕部６２、６３は、図４にて示すごとく、連結部６１の内壁６１ａの長手方向中央に対する法線（即ち、支持ロッド６４の軸）を基準に対称的な形状を有しており、腕部６２は、その先端部にて、ヨーク部４０の腕部４３の先端部と一体になっている。また、腕部６３は、その先端部にて、ヨーク部５０の腕部５３の先端部と一体となっている。ここで、両支持ロッド５４、６４の各軸は、上記所定の開き角度にて交差しており、これら両支持ロッド５４、６４の各先端部は、各磁極４１ｂ、４２ｂ、４３ｂ、４２ｃ、４３ｃ、５３ａと共にヨークＹの磁極を形成する。また、各支持ロッド５４、６４の先端部及び各磁極４１ｂ、４２ｂ、４３ｂ、４２ｃ、４３ｃ、５３ａは、その先端面にて、マグネットロータＲの外周面に沿い円周状に位置する。なお、両腕部６２、５３の連結先端部には、上記突起５３ａが形成されている。
【００２９】
両コイル素子Ｃａ、Ｃｂは、共に、直方体形状のもので、これら各コイル素子Ｃａ、Ｃｂは、それぞれ、各ヨーク部５０、６０内に図２にて示すごとく収容支持されている。
【００３０】
コイル素子Ｃａは、ボビン７０と、両ピン状ターミナル８０と、ソレノイド状コイル９０とにより構成されている。ボビン７０は、電気絶縁性樹脂により断面四角形状にて段付き筒状に形成されており、このボビン７０は、巻装部７０ａの軸方向両端に各保持部７０ｂ、７０ｃをそれぞれ同軸的に形成して構成されている。なお、ボビン７０の中空部は、この中空部内に支持ロッド５４を相対回動不能に挿通し得る程度に当該支持ロッド５４の断面形状と相似な断面四角形状となっている。
【００３１】
両保持部７０ｂ、７０ｃは、四角環状のもので、保持部７０ｂの上下両側対向壁部７１（図２では上側対向壁部７１のみを示す）は、その各長手方向（保持部７０ｂの軸に直交する方向）の中央部を上下両側対向壁部７１の各外縁からコ字状に切り欠くことで、両ターミナル部７１ａの間にコ字状逃げ部７１ｂを形成して構成されている。また、保持部７０ｃの上下両側対向壁部７２（図２では上側対向壁部７２のみを示す）は、その各長手方向（保持部７０ｂの軸に直交する方向）の中央部を上下両側対向壁部７２の各外縁からコ字状に切り欠くことで、両ターミナル部７２ａ（図２では、一方のターミナル部７２ａのみを示す）の間にコ字状逃げ部７２ｂを形成して構成されている。
【００３２】
このように構成したボビン７０は、その中空部にて、ヨーク部５０の支持ロッド５４に外方から同軸的に嵌装されており、このボビン７０は、その保持部７０ｂにて、ヨーク部５０の連結部５１に当接し、保持部７０ｃにて、ヨーク部４０の腕部４３に対向している。但し、ボビン７０の両保持部７０ｂ、７０ｃの各長手方向幅は、ヨーク部４０の平面状内壁４３ａの長手方向幅よりも狭い。また、保持部７０ｂの逃げ部７１ｂ及び保持部７０ｃの逃げ部７２ｂのボビン７０の軸に直角な方向の各幅は、磁極４３ｂの幅よりも広い。
【００３３】
また、両ターミナル８０の一方は、保持部７０ｂの両ターミナル部７１ａのうち図２にて図示左上側ターミナル部７１ａ（両ターミナル部７１ａのうち指針軸Ｄｂの軸からより遠く離れて位置するターミナル部７１ａ）に挿通されて、図１及び図３にて示すごとく、ケーシング３０の上壁３１及び配線板２０を通り延出している。他方のターミナル８０は、保持部７０ｃの両ターミナル部７２ａのうち図２にて図示左上側ターミナル部７２ａ（両ターミナル部７２ａのうち指針軸Ｄｂの軸からより遠く離れて位置するターミナル部７２ａ）に挿通されて、図１及び図３にて示すごとく、ケーシング３０の上壁３１及び配線板２０を通り延出している。
【００３４】
コイル９０は、ボビン７０の巻装部７０ａに同軸的に巻装されており、このコイル９０は、各保持部７０ｂ、７０ｃにより挟持保持されている。このため、巻装部７０ａの外径寸法は、両保持部７０ｂ、７０ｃの外径寸法よりも小さくなっている。また、コイル９０は、その各巻線状端子にて、それぞれ、各ターミナル８０の先端部に巻き付けられている。なお、各ターミナル８０の先端部は、それぞれ、コイル９０の各巻線状端子と共に配線板２０の表面の対応配線部にはんだ付けされている。
【００３５】
コイル素子Ｃｂは、コイル素子Ｃａのボビン７０、両ターミナル８０及びコイル９０にそれぞれ対応するボビン１００、両ピン状ターミナル１１０及びソレノイド状コイル１２０とにより構成されている。ボビン１００は、ボビン７０と同様に構成されており、このボビン１００は、巻装部１００ａの軸方向両端に各保持部１００ｂ、１００ｃをそれぞれ同軸的に形成して構成されている。
【００３６】
両保持部１００ｂ、１００ｃは両保持部７０ｂ、７０ｃと同様に構成されており、保持部１００ｂの上下両側対向壁部１０１（図２では上側対向壁部１０１のみを示す）は、その各長手方向（保持部１００ｂの軸に直交する方向）の中央部を上下両側対向壁部１０１の各外縁からコ字状に切り欠くことで、両ターミナル部１０１ａの間にコ字状逃げ部１０１ｂを形成して構成されている。また、保持部１００ｃの上下両側対向壁部１０２（図２では上側対向壁部１０２のみを示す）は、その各長手方向（保持部１００ｂの軸に直交する方向）の中央部を上下両側対向壁部１０２の各外縁からコ字状に切り欠くことで、両ターミナル部１０２ａ（図２では、一方のターミナル部１０２ａのみを示す）の間にコ字状逃げ部１０２ｂを形成して構成されている。なお、ボビン１００の中空部はボビン７０の中空部と同一の断面形状を有する。
【００３７】
このように構成したボビン１００は、その中空部にて、ヨーク部６０の支持ロッド６４に外方から同軸的に嵌装されており、このボビン１００は、その保持部１００ｂにて、ヨーク部６０の連結部６１に当接し、保持部１００ｃにて、ヨーク部４０の腕部４２に対向している。但し、ボビン１００の両保持部１００ｂ、１００ｃの各長手方向幅は、ヨーク部４０の平面状内壁４２ａの連結部４２の長手方向幅よりも狭い。また、保持部１００ｂの逃げ部１０１ｂ及び保持部１００ｃの逃げ部１０２ｂのボビン１００の軸に直角な方向の各幅は、磁極４２ｂの幅よりも広い。
【００３８】
また、両ターミナル１１０は両ターミナル８０と同様のもので、当該両ターミナル１１０の一方は、保持部１００ｂの両ターミナル部１０１ａのうち図２にて図示左下側ターミナル部１０１ａ（両ターミナル部１０１ａのうち指針軸Ｄｂの軸からより遠く離れて位置するターミナル部１０１ａ）に挿通されて、図１及び図３にて示すごとく、ケーシング３０の上壁３１及び配線板２０を通り延出している。他方のターミナル１１０は、保持部１００ｃの両ターミナル部１０２ａのうち図２にて図示左下側ターミナル部１０２ａ（両ターミナル部１０２ａのうち指針軸Ｄｂの軸からより遠く離れて位置するターミナル部１０２ａ）に挿通されて、図１及び図３にて示すごとく、ケーシング３０の上壁３１及び配線板２０を通り延出している。
【００３９】
コイル１２０は、コイル９０と同様に構成されており、このコイル１２０は、ボビン１００の巻装部１００ａに同軸的に巻装され、各保持部１００ｂ、１００ｃにより挟持保持されている。また、コイル１２０は、その各巻線状端子にて、それぞれ、各ターミナル１２０の先端部に巻き付けられている。なお、各ターミナル１１０の先端部は、それぞれ、コイル１２０の各巻線状端子と共に配線板２０の表面の対応配線部にはんだ付けされている。
【００４０】
以上のように構成した両コイル素子Ｃａ、Ｃｂは、図２にて示すごとく、後述するマグネットロータＲの回転軸Ｒ１と指針軸Ｄｂとの間を径方向に結ぶ線を基準、互いに対称的に位置しており、両コイル素子Ｃａ、Ｃｂの各軸（各ボビン７０、１００の軸）は、マグネットロータＲの回転軸Ｒ１を基準として互いにほぼ直交する位置にある。また、コイル素子Ｃａは、その保持部７０ｃにて、マグネットロータＲの外周面に対向し、一方、コイル素子Ｃｂは、その保持部１００ｃにて、マグネットロータＲの外周面に対向している。
【００４１】
マグネットロータＲは、ヨーク部４０内にて、回転軸Ｒ１に減速歯車列Ｇの入力段側歯車Ｇ１と共に同軸的に支持されている。これにより、マグネットロータＲは、その外周面にて、ヨーク部４０の各磁極４１ｂ、４２ｂ、４３ｂ、４２ｃ、４３ｃ及び両コイル素子Ｃａ、Ｃｂに対向して、各コイル９０、１２０及びヨークＹと共に磁気回路を形成し、両コイル９０、１２０への配線板２０を介する給電のもとに回転する。なお、回転軸Ｒ１は、ケーシング３０の上壁３１と底壁３２との間に回動可能に支持されている。
【００４２】
減速歯車列Ｇは、図２にて示すごとく、上記入力段側歯車Ｇ１の他、各中間側歯車Ｇ２及び出力段側歯車Ｇ３を備えており、出力段側歯車Ｇ３は、指針軸Ｄｂに同軸的に支持されている。入力段歯車Ｇ１は、各中間側歯車Ｇ２を介し、出力段側歯車Ｇ３と噛合している。これにより、減速歯車列Ｇは、マグネットロータＲの回転を歯車Ｇ１から歯車Ｇ３に減速して伝達する。
【００４３】
当該計器は、図１にて示すごとく、発光指針１３０及び複数の光源１４０を備えており、発光指針１３０は、その回動基部１３１にて、指針軸Ｄｂの先端部に支持されて、目盛り盤１０の表面に沿い回動するようになっている。
【００４４】
各光源１４０は、発光ダイオードからなるもので、これら各光源１４０は、指針軸Ｄｂの軸周り近傍にて、目盛り盤１０の貫通穴部１１を通して発光指針１３０の回動基部１３１を臨むように、互いに間隔をおいて、配線板２０の表面に配設されている。これら各光源１４０は、その各端子にて、配線板２０の表面の対応配線部にはんだ付けにより電気的に接続されている。
【００４５】
これにより、各光源１４０は、配線板２０を介し給電されて、発光し、目盛り盤１０の貫通穴部１１を通して発光指針１３０の回動基部１３１内に光を入射する。なお、各光源１４０は、発光ダイオードに限ることなく、例えば、ランプでもよい。
【００４６】
以上のように構成した本実施形態において、両コイル素子Ｃａ、ＣｂのヨークＹに対する組み付け方法について説明する。両コイル素子Ｃａ、Ｃｂのいずれからでもよいが、例えば、コイル素子Ｃａから組み付けを開始する。まず、ケーシング部材３０ａをその底壁３２にて水平状となるように支持する。そして、ヨークＹをケーシング部材３０ａ内にて底壁３２上に沿うように取り付ける。ついで、コイル素子Ｃａを、図５にて示すように、ヨークＹ内のヨーク部４０の腕部４３とヨーク部５０との間に、突起４３ｂと支持ロッド５４と同軸的に位置させるように嵌め込む。
【００４７】
この嵌め込みにあたり、上述のごとく、ヨーク部４０の腕部４３の内壁４３ａは平面状に形成されている。また、この平面状内壁４３ａは、ヨーク部５０の支持ロッド５４の軸方向に直角に位置する。また、突起４３ｂは、支持ロッド５４と同軸的に位置しており、突起４３ｂ側から支持ロッド５４を同軸的にみたとき、突起４３ｂの先端面は支持ロッド５４の先端面と重畳的に一致する。しかも、ボビン７０の両保持部７０ｂ、７０ｃの各長手方向幅は、ヨーク部４０の平面状内壁４３ａの長手方向幅よりも狭い。また、保持部７０ｂの逃げ部７１ｂ及び保持部７０ｃの逃げ部７２ｂのボビン７０の軸に直角な方向の各幅は、磁極４３ｂの幅よりも広い。
【００４８】
このため、上述のような嵌め込みの過程において、ヨーク部５０の支持ロッド５４が、その先端部にて、コイル素子Ｃａのボビン７０における保持部７０ｂの逃げ部７１ｂ内を通り保持部７０ｂと同軸的に位置し、かつ、ヨーク部４０の突起４３ｂが、ボビン７０における保持部７０ｃの逃げ部７２ｂ内を通り保持部７０ｃと同軸的に位置し、保持部７０ｃがその端面にて腕部４３の平面状内壁４３ａに当接する。これにより、腕部４３の内壁部４３ａを平面状に形成したことを前提に、保持部７０ｃと腕部４３との干渉を招くことなく、コイル素子Ｃａをヨーク部４０の腕部４３とヨーク部５０との間に確実にかつ円滑に嵌め込むことができる。
【００４９】
このようにコイル素子Ｃａを嵌め込んだ後は、当該コイル素子Ｃａのボビン７０の中空部は支持ロッド５４と同軸的に位置しており、ボビン７０の中空部の断面形状は支持ロッド５４の断面形状と上記相似な形状を有する。このため、ボビン７０の中空部内に支持ロッド５４を挿入するように、コイル素子Ｃａを支持ロッド５４の軸方向に沿い移動させれば、当該コイル素子Ｃａは、図６にて示すごとく、ボビン７０にて、ヨーク部５０内において支持ロッド５４により同軸的にかつ相対回動不能に支持される。
【００５０】
ここで、上述のようにヨーク部４０の腕部４３の内壁４３ａを平面状に形成したので、ボビン７０の軸方向長さを適正に確保することができ、その結果、コイル素子Ｃａのコイル９０としての巻き線の巻き数も適正に確保し得る。
【００５１】
次に、コイル素子Ｃｂを、図７にて示すように、ヨークＹ内のヨーク部４０の腕部４２とヨーク部６０との間に、突起４２ｂと支持ロッド６４と同軸的に位置させるように嵌め込む。
【００５２】
この嵌め込みにあたり、上述のごとく、ヨーク部４０の腕部４２の内壁４２ａは平面状に形成されている。また、この平面状内壁４２ａは、ヨーク部６０の支持ロッド６４の軸方向に直角に位置する。また、突起４２ｂは、支持ロッド６４と同軸的に位置しており、突起４２ｂ側から支持ロッド６４を同軸的にみたとき、突起４２ｂの先端面は支持ロッド６４の先端面と重畳的に一致する。しかも、ボビン１００の両保持部１００ｂ、１００ｃの各長手方向幅は、ヨーク部４０の平面状内壁４２ａの長手方向幅よりも狭い。また、保持部１００ｂの逃げ部１０１ｂ及び保持部１００ｃの逃げ部１０２ｂのボビン１００の軸に直角な方向の各幅は、磁極４２ｂの幅よりも広い。
【００５３】
このため、上述のような嵌め込みの過程において、ヨーク部６０の支持ロッド６４が、その先端部にて、コイル素子Ｃｂのボビン１００における保持部１００ｂの逃げ部１０１ｂ内を通り保持部１００ｂと同軸的に位置し、かつ、ヨーク部４０の突起４２ｂが、ボビン１００における保持部１００ｃの逃げ部１０２ｂ内を通り保持部１００ｃと同軸的に位置し、保持部１００ｃがその端面にて腕部４２の平面状内壁４２ａに当接する。これにより、腕部４２の内壁部４２ａを平面状に形成したことを前提に、保持部１００ｃと腕部４２との干渉を招くことなく、コイル素子Ｃｂをヨーク部４０の腕部４２とヨーク部６０との間に確実にかつ円滑に嵌め込むことができる。
【００５４】
このようにコイル素子Ｃｂを嵌め込んだ後は、当該コイル素子Ｃｂのボビン１００の中空部は支持ロッド６４と同軸的に位置しており、ボビン１００の中空部の断面形状は支持ロッド６４の断面形状と上記相似な形状を有する。このため、ボビン１００の中空部内に支持ロッド６４を挿入するように、コイル素子Ｃｂを支持ロッド６４の軸方向に沿い移動させれば、当該コイル素子Ｃｂは、図８にて示すごとく、ボビン１００にて、ヨーク部６０内において支持ロッド６４により同軸的にかつ相対回動不能に支持される。
【００５５】
ここで、上述のようにヨーク部４０の腕部４２の内壁４２ａを平面状に形成したので、ボビン１００の軸方向長さを適正に確保することができ、その結果、コイル素子Ｃｂのコイル１２０としての巻き線の巻き数も適正に確保し得る。
【００５６】
また、以上のように両コイル素子Ｃａ、ＣｂをヨークＹに組み付けた後、指針軸Ｄｂ及び減速歯車列Ｇを図２にて示すごとく、ケーシング部材３０ａに取り付ける。然る後、コイル素子Ｃａの両ターミナル８０、コイル素子Ｃｂの両ターミナル１１０及び指針軸Ｄｂがケーシング部材３０ｂの上壁３１を図３にて示すごとく通るように、ケーシング部材３０ｂをその開口部にてケーシング部材３０ａの開口部に組み付ける。これにより、内機本体Ｄａの組み付けが終了する。
【００５７】
この終了後、図１にて示すごとく各光源１４０が貫通穴部２１の周囲に設けられた配線板２０に各ターミナル８０、１１０及び指針軸Ｄｂを上述のごとく挿通させるようにして、当該配線板２０をケーシング３０の上壁３１上に組み付ける。然る後、目盛盤１０の貫通穴部１１を通して延出される指針軸Ｄｂの先端部に発光指針１３０をその回動基部１３１にて支持する。これにより、当該計器の組み付けが完了する。
【００５８】
以上のように組み付けた当該計器では、コイル素子Ｃａの両ターミナル８０とコイル素子Ｃｂの両ターミナル１１０とが、指針軸Ｄｂの軸から互いに逆方向に遠く離れて位置する。このため、上述のように配線板２０の貫通穴部２１の周囲、換言すれば、指針軸Ｄｂの軸周り近傍に、発光指針１３０用の各光源１４０を容易に配設することができる。
【００５９】
なお、本発明の実施にあたり、上記実施形態において、目盛盤１０として透光性目盛盤を採用し、この透光性目盛盤の裏面に導光板を併設し、この導光板の貫通穴部及び目盛盤１０の貫通穴部１１を通して指針軸Ｄｂを延出させ、かつ、上記導光板の貫通穴部の内周面を断面テーパ状に形成して、各光源１４０の光を上記導光板内にもその貫通穴部の内周面から導入して透光性目盛盤を照明する構成の計器に本発明を適用しても、上記実施形態と同様の作用効果を達成できる。
【００６０】
また、この場合、各光源１４０のすべての光を上記導光板内にその貫通穴部の内周面から導入するようにして、発光指針１３０に代えて通常の指針を採用しても、上記実施形態と同様の作用効果を達成できる。
【００６１】
また、本発明の実施にあたり、上記実施形態において、減速歯車列Ｇを廃止して、マグネットロータＲの回転軸として、指針軸Ｄｂを、回転軸Ｒ１に代えて用いるようにしてもよい。この場合には、指針軸Ｄｂが、図２の回転軸Ｒ１の位置にてケーシング３０の上下両壁に回動可能に支持されることになる。従って、コイル素子Ｃａでは、両ターミナル８０のうち、ボビン７０の保持部７０ｃに設けたターミナル８０は、保持部７０ｂの残りのターミナル部７１ａ（図２にて図示右上側のターミナル部７１ａ）に挿通されて、ケーシング３０の上壁及び配線板２０を通り延出される。一方、コイル素子Ｃｂでは、両ターミナル１１０のうち、ボビン１００の保持部１００ｃに設けたターミナル１１０は、保持部１００ｂの残りのターミナル部１０１ａ（図２にて図示右上側のターミナル部１０１ａ）に挿通されて、ケーシング３０の上壁及び配線板２０を通り延出される。
【００６２】
これによっても、ステップモータＭの両コイル素子Ｃａ、Ｃｂの各ターミナル８０、１１０は、指針軸Ｄｂから遠く離れて位置する構成となる。このような構成においても、上記実施形態にて述べたと同様に、両コイル素子Ｃａ、ＣｂのヨークＹに対する組み付けを円滑にかつ確実に確保できる。
【００６３】
また、本発明の実施にあたり、上記実施形態にて述べたヨークＹにおいて、ヨーク部５０の腕部５３及びヨーク部６０の腕部６３は、例えば、ヨーク部４０の連結部４１に並行な連結部として形成し、この連結部から突起５３ａに代わるロッドを延出させてこのロッドの先端部に突起５３ａの磁極としての機能をもたせるようにしてもよい。
【００６４】
また、本発明の実施にあたり、計器の発光指針に限ることなく、各種機器の回動部材を回動可能に支持する軸を回動する駆動源として、上記実施形態にて述べたステップモータＭを採用しても、上記実施形態にて述べたと同様に、両コイル素子Ｃａ、ＣｂのヨークＹに対する組み付けを円滑にかつ確実に確保できる。
【００６５】
また、本発明の実施にあたり、上記実施形態にて述べたヨーク部４０の各磁極は、その位置を適宜変更してもよい。例えば、連結部４１の突起４１ｂを廃止して、突起４２ｂを連結部４１と腕部４２との境界に設け、突起４３ｂを連結部４１と腕部４３との境界に設けるようにしてもよい。この場合には、両ボビン７０、１００の各逃げ部は少なくとも不要である。
【００６６】
前記実施形態では、減速歯車列Ｇは、ステップモータＭとは別の構成素子として説明したが、この減速歯車列ＧはステップモータＭの構成部材であってもよい。
【００６７】
また、本発明の実施にあたり、乗用車用計器に限ることなく、バス、トラック、自動二輪車等の各種自動車等の車両用計器であってステップモータを回動内機に有する計器に本発明を適用してもよい。
【図面の簡単な説明】
【図１】本発明に係る乗用車用計器の一実施形態を示すの部分破断概略側面図である。
【図２】図１の回動内機を、上側ケーシング部材を除去した状態で示す平面図である。
【図３】図１の回動内機の平面図である。
【図４】図２のヨークの平面図である。
【図５】コイル素子Ｃａをヨーク内においた状態を示す平面図である。
【図６】コイル素子Ｃａをヨーク部５０内に支持する状態を示す平面図である。
【図７】コイル素子Ｃｂをヨーク内においた状態を示す平面図である。
【図８】コイル素子Ｃｂをヨーク部６０内に支持する状態を示す平面図である。
【図９】従来のステップモータのヨークを示す平面図である。
【図１０】図９のヨークにコイル素子を組み付ける場合の平面図である。
【符号の説明】
Ｃａ、Ｃｂ…コイル素子、Ｄａ…内機本体、Ｄｂ…指針軸、Ｇ…減速歯車列、
Ｇ１、Ｇ３…歯車、Ｒ…マグネットロータ、Ｓ…ステータ、Ｙ…ヨーク、
１０…目盛盤、１１、２１…貫通穴部、２０…配線板、
４０、５０、６０…ヨーク部、４１…連結部、４２、４３…腕部、４２ａ、４３ａ…内壁、５４、６４…支持ロッド、７０、１００…ボビン、
７０ｂ、７０ｃ、１００ｂ、１００ｃ…保持部、
７１ａ、７２ａ、１０１ａ、１０２ａ…端部、８０、１１０…ターミナル、
９０、１２０…コイル、１３０…発光指針、１３１…回動基部、
１４０…光源。[0001]
BACKGROUND OF THE INVENTION
The present invention is a step motor. The The present invention relates to an instrument used as a drive source.
[0002]
[Prior art]
Conventionally, for example, some passenger car meters use a step motor as a driving source for the pointer. Here, the step motor is composed of a stator and a magnet rotor. If this step motor is, for example, of a two-phase type, the stator has an annular yoke and both coil elements that form a magnetic circuit together with the magnet rotor.
[0003]
[Problems to be solved by the invention]
By the way, in the said meter, the stator of the step motor is provided with the annular yoke 1 as shown in FIG.9 and FIG.10, and a pair of coil elements 2 (only one coil element is shown in FIG. 10). Yes. The yoke 1 includes a yoke portion 1a and two yoke portions 1b and 1c extending from the yoke portion 1a in a bifurcated manner. The yoke portions 1b and 1c are provided on both sides of a pointer shaft that supports the pointer. Is located.
[0004]
Here, when the pointer is a light emission pointer, in order to easily arrange a plurality of light sources that make light incident on the light emission pointer around the axis of the pointer shaft, the coil element 2 is placed in both yoke portions 1c. It is necessary to provide both terminals of the coil element 2 at the lower part of each figure in FIG. 10 at both ends in the axial direction of the bobbin 2b as exemplified by the respective reference numerals 2a in FIG.
[0005]
However, when both the terminals 2a are provided on the bobbin 2b in this way, the axial length of the bobbin 2b becomes longer than when both terminals 2a are provided at one end of the bobbin in the axial direction. Therefore, when the coil element 2 is to be fitted into the yoke 1 as shown in FIG. 10 in order to support the coil element 2 on the support rod 1d of the yoke part 1c, the inner wall 1e of the yoke part 1a is shown in FIG. If it is formed in an arcuate surface shape as shown in FIG. 10, one of both end portions in the axial direction of the bobbin 2b interferes with the inner wall 1e of the yoke portion 1a and cannot be fitted into the yoke 1.
[0006]
In order to cope with this, it is conceivable to shorten the axial length of the bobbin 2b. In this case, however, there is a problem that the number of windings of the winding on the bobbin 2b is insufficient.
[0007]
Therefore, in order to cope with the above-described problems, the present invention has been devised in the shape of the yoke of the stator to ensure the appropriate number of windings as the coil of the coil element and to the yoke of the coil element. Step motor designed to facilitate assembly The The purpose is to provide a meter to be used.
[0008]
[Means for Solving the Problems]
In solving the above-mentioned problems, the invention according to claim 1 Is a meter in which a plurality of light sources (140) for entering light into the light emitting pointer (130) are arranged around the axis of the pointer shaft (Db), and the pointer shaft is rotated by a step motor, The step motor includes a yoke (Y), a stator (S) having first and second coil elements (Ca, Cb), and a magnet rotor (R). The yoke includes a first yoke portion (40). The second and third yoke portions (50, 60) extending in a bifurcated manner from the first yoke portion are formed in an annular shape, and the first yoke portion is formed in a longitudinal connection portion (41). And from both ends in the longitudinal direction of this connecting part Total The second yoke part has a support rod (54) extending toward the inner wall (43a) of one of the both arm parts (43), and a third yoke part (42, 43). The yoke portion has a support rod (64) extending toward the inner wall (42a) of the other (42) of both arms, and the magnet rotor is connected to the first yoke portion on the outer peripheral surface thereof. The first coil element (Ca) is coaxially connected to the support rod of the second yoke portion. The first coil element (Ca) is rotatably supported in the yoke so as to face the inner walls of the first and second arm portions and the tip ends of the two support rods. Cylindrical bobbin (70) that is supported in a magnetic manner, and a coil (90) wound around the bobbin in a solenoid shape between both axial ends (70b, 70c) to form a magnetic circuit together with the magnet rotor and yoke ) And the second coil element (C ) Is a cylindrical bobbin (100) that is coaxially supported by the support rod of the third yoke portion, and a magnet wound around the bobbin in a solenoid shape between both axial end portions (100b, 100c). A coil (120) that forms a magnetic circuit with the rotor and the yoke, The bobbin of the first coil element has two terminal portions (71a) at one end portion in the axial direction far from the outer peripheral surface of the magnet rotor, and two terminal portions (72a) at the other end portion in the axial direction. In the bobbin of the first coil element, the two terminal portions at one end in the axial direction and the two terminal portions at the other end in the axial direction are opposite to each other toward the outside of the bobbin in the axial direction of the bobbin. The bobbin of the second coil element has two terminal portions (101a) at one axial end far from the outer peripheral surface of the magnet rotor, and two at the other axial end. In the bobbin of the second coil element, two terminal portions at one axial end portion and two terminal portions at the other axial end portion of the bobbin Protrudes in opposite directions toward the outside of the bobbin in the direction, The inner wall of one arm portion of the first yoke portion is a planar inner wall perpendicular to the axis of the support rod of the second yoke portion, and the inner wall of the other arm portion of the first yoke portion is the support rod of the third yoke portion. Is a flat inner wall perpendicular to the axis of It is characterized by .
[0009]
Thus, since the inner walls of both arms of the first yoke part are formed in a flat shape, interference between the axial end of the bobbin of the first coil element and one arm of the first yoke part is caused. The first coil element can be securely and smoothly fitted between the one arm part of the first yoke part and the second yoke part, and the axial end of the bobbin of the second coil element The second coil element can be securely and smoothly fitted between the other arm portion of the first yoke portion and the third yoke portion without causing interference between the first yoke portion and the other arm portion of the first yoke portion. it can. Thereafter, the first coil element is coaxially fitted to the support rod of the second yoke part by its bobbin from the outside, and the second coil element is coaxially fitted to the support rod of the third yoke part by its bobbin. Thus, the first and second coil elements can be supported in the second and third yoke portions by being fitted from the outside.
[0010]
Here, as described above, since the inner walls of both arms of the first yoke portion are formed in a planar shape, the axial length of each bobbin can be ensured appropriately. As a result, the coil of each coil element can be secured. As a result, the number of windings can be properly secured.
[0011]
In the invention according to claim 2, 2. The instrument according to claim 1, wherein the axis of the magnet rotor is a pointer shaft, and in the first coil element, the coil is at both terminal portions at one end of the bobbin of the first coil element in the axial direction. In the second coil element, the coil is connected to both terminals (80) provided in the two terminal parts, and the two terminals at the one end part in the axial direction of the bobbin of the second coil element It is connected to both terminals (110) provided in the section .
Further, in the invention described in claim 3, the plurality of light sources (140) for making the light incident on the light emitting pointer (130) are arranged around the axis of the pointer shaft (Db), and the pointer shaft is rotated by the step motor. The step motor includes a yoke (Y) and a stator (S) having first and second coil elements (Ca, Cb), a magnet rotor (R), and a reduction gear train (G The yoke is formed in an annular shape with a first yoke portion (40) and second and third yoke portions (50, 60) extending from the first yoke portion in a bifurcated manner. The first yoke portion includes a longitudinal connecting portion (41) and both arm portions (42, 43) extending from both ends in the longitudinal direction of the connecting portion, and the second yoke portion includes both arm portions. Support rod (54) extending toward the inner wall (43a) of one (43) The third yoke part has a support rod (64) extending toward the inner wall (42a) of the other arm part (42) of both arms, and the magnet rotor has an outer peripheral surface thereof, The first yoke portion is rotatably supported in the yoke so as to face the inner walls of the connecting portion and both arm portions of the first yoke portion, and the tip ends of both support rods. The reduction gear train is composed of a magnet rotor and its shaft. An input stage gear (G1) supported coaxially and an output stage gear (G3) supported coaxially by an output shaft parallel to the axis of the magnet rotor, the output shaft of the output stage gear being a pointer shaft The first coil element (Ca) is formed between a cylindrical bobbin (70) that is coaxially supported by the support rod of the second yoke part, and both axial ends (70b, 70c) of the bobbin. Is wound in a solenoid shape with a magnet rotor and The second coil element (Cb) includes a cylindrical bobbin (100) that is coaxially supported by the support rod of the third yoke portion, and a coil (90) that forms a magnetic circuit with the yoke. A coil (120) that is wound in a solenoid shape between both axial end portions (100b, 100c) and forms a magnetic circuit together with the magnet rotor and the yoke. In the first coil element, the coil is The one side terminal portion is connected to the terminal (80) provided in the terminal portion (71a) far from the pointer shaft among one of the axial ends of the bobbin of the first coil element, and the other side terminal portion The other end of the first coil element bobbin in the axial direction is connected to another terminal (80) provided at the other terminal part (72a) far from the pointer shaft, The null portion and the other terminal portion protrude in opposite directions toward the outside of the bobbin in the axial direction of the bobbin. In the second coil element, the coil is connected to the one side terminal portion of the second coil element. One end of both ends of the bobbin in the axial direction is connected to the terminal (110) provided in the terminal portion (101a) far from the pointer shaft, and the other end of the second coil element is connected to both ends in the axial direction of the bobbin. The other terminal portion is connected to another terminal (110) provided in another terminal portion (102a) far from the pointer shaft, and the terminal portion and the other terminal portion are directed toward the outside of the bobbin in the axial direction of the bobbin. The inner wall of one arm part of the first yoke part is a planar inner wall perpendicular to the axis of the support rod of the second yoke part, and the inner wall of the other arm part of the first yoke part. Is the third yo Characterized in that it is a perpendicular planar inner wall to the axis of the support rod of the click portion .
[0012]
Thus, even if the step motor has a reduction gear train, substantially the same operation and effect as the first aspect of the invention can be achieved.
[0013]
Claims 4 According to the invention described in claim 1, Any one of 3 Described in Instrument The first coil element is coaxially positioned on the bobbin between the planar inner wall of one arm portion of the first yoke portion and the tip end portion of the support rod of the second yoke portion. Is inserted from the outside along the support rod, and is coaxially supported by the support rod, while the second coil element has the other arm of the first yoke portion at the bobbin. Is inserted between the planar inner wall of the support portion and the tip of the support rod of the third yoke portion so as to be positioned coaxially with the support rod, and is then fitted from the outside along the support rod. It is characterized by being supported coaxially by the rod. Accordingly, the claim 1 3 The effects of the invention described in the above can be achieved more reliably.
[0014]
Claims 5 Invention described in Is a meter according to any one of claims 1 to 4. The scale plate (10), the wiring board (20) provided in parallel on the back side of the scale board, and the main unit (Da) provided on the back side of the wiring board And The inner unit body has a step motor, The pointer shaft extends from the inner unit main body through the through holes (21, 11) of the wiring board and the scale plate so as to be rotatable, and the light emitting pointer is provided at the distal end portion of the pointer shaft at the rotation base (131). The plurality of light sources are arranged at intervals around the surface of the wiring board in the vicinity of the axis of the pointer shaft so that the through holes of the wiring board are formed. The light is incident on the rotating base of the light emitting pointer. .
[0015]
Accordingly, the claim 1 Any one of 4 It is possible to provide an instrument that can achieve the effects of the invention described in (1).
[0016]
In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an example of a passenger car instrument according to the present invention, and this instrument is disposed on an instrument panel provided in a passenger compartment of the passenger car.
[0018]
As shown in FIG. 1, the instrument includes a scale board 10, a wiring board 20 that is parallel to the scale board 10 on the back side thereof, and a rotary inner unit D. The rotating inner unit D includes an inner unit main body Da and a pointer shaft Db that extends from the inner unit main body Da through the through hole portion 21 of the wiring board 20 and the through hole portion 11 of the dial 10 so as to be rotatable. It is configured. Here, as shown in FIG. 1, the wiring board 20 is supported along the upper end surface of the internal unit main body Da.
[0019]
As shown in FIG. 1, the inner body Da includes a casing 30. As can be seen from FIGS. 1 to 3, the casing 30 includes upper and lower casing members 30a, 30b having a U-shaped cross section. Each opening is configured in combination. The casing 30 is fastened to the wiring board 20 from the back side thereof by a plurality of screws at an upper wall 31 of the casing member 30a (hereinafter also referred to as the upper wall 31 of the casing 30).
[0020]
Further, as shown in FIG. 2, the internal machine main body Da includes a step motor M and a reduction gear train G assembled in the casing 30. The step motor M includes a stator S and a magnet rotor R. The stator S includes an annular yoke Y and both coil elements Ca and Cb. The yoke Y cannot move along the bottom wall 32 (hereinafter also referred to as the bottom wall 32 of the casing 30) in the casing 30. The accommodation is fixed.
[0021]
Further, as shown in FIG. 2, the yoke Y is composed of substantially U-shaped yoke portions 40 to 60, and both yoke portions 50 and 60 are arranged as shown in FIGS. Are integrally formed so as to extend in a bifurcated shape at a predetermined opening angle (for example, 90 degrees).
[0022]
The yoke portion 40 is formed in a substantially U shape by extending the arm portions 42 and 43 from both ends of the connecting portion 41 in the longitudinal direction. The connecting portion 41 includes a protrusion 41b. The protrusion 41b has a quadrangular cross section and protrudes perpendicularly to the inner wall 41a from the longitudinal center of the inner wall 41a of the connecting portion 41.
[0023]
As shown in FIGS. 2 and 4, the arm portions 42 and 43 have symmetrical shapes with respect to a normal line with respect to the longitudinal center of the inner wall 41 a of the connecting portion 41. The inner wall 42a of the arm part 42 is formed in a planar shape, and this planar inner wall 42a faces the yoke part 60 so as to be positioned at a right angle to the axial direction of a support rod 64 (described later) of the yoke part 60. ing. The arm portion 42 includes a protrusion 42b. The protrusion 42b has a quadrangular cross section, protrudes perpendicularly to the inner wall 42a from the longitudinal center of the inner wall 42a of the arm portion 42, and is coaxial with the support rod 64. Opposite to.
[0024]
On the other hand, the inner wall 43a of the arm portion 43 is formed in a planar shape, and this planar inner wall 43a is located on the yoke portion 50 so as to be positioned at right angles to the axial direction of a support rod 54 (described later) of the yoke portion 50. Opposite. The arm portion 43 includes a protrusion 43b. The protrusion 43b has a quadrangular cross section, protrudes perpendicularly to the inner wall 43a from the longitudinal center of the inner wall 43a of the arm portion 43, and is coaxial with the support rod 54. Opposite to. The protrusions 41b, 42b, and 43b are formed together with the protrusions 42c and 43c formed on the arm parts 42 and 43 at the opening of the yoke part 40 and the protrusions 53a (described later) common to both the yoke parts 50 and 60. The magnetic poles of the yoke Y (hereinafter also referred to as magnetic poles 41b, 42b, 43b, 42c, 43c, 53a) are configured. The width along the longitudinal direction of the arm portion 42 of the magnetic pole 42b is equal to the width along the longitudinal direction of the arm portion 43 of the magnetic pole 43b.
[0025]
The yoke portion 50 is formed in a substantially U shape by extending the arm portions 52 and 53 from both ends of the connecting portion 51 in the longitudinal direction. The connecting portion 51 includes a support rod 54. The support rod 54 has a square cross section and extends from the center in the longitudinal direction of the planar inner wall 51a of the connecting portion 51 toward the protrusion 43b. Here, the cross-sectional shape of the support rod 54 is the same as the quadrangular cross-section of the protrusion 43b, and the front end surface of the support rod 54 overlaps with the front end surface of the protrusion 43b when viewed from the axial direction of the support rod 54. Match.
[0026]
As shown in FIG. 4, each of the arms 52 and 53 has a symmetrical shape with respect to a normal to the longitudinal center of the inner wall 51 a of the connecting portion 51 (that is, the axis of the support rod 54). The arm part 52 is integrated with the tip part of the arm part 42 of the yoke part 40 at the tip part.
[0027]
The yoke portion 60 is formed in a substantially U-shape by extending the arm portions 62 and 63 from both ends of the connecting portion 61 in the longitudinal direction. The connecting portion 61 includes a support rod 64. The support rod 64 has a square cross section and extends from the center in the longitudinal direction of the planar inner wall 61a of the connecting portion 61 toward the protrusion 42b. Here, the cross-sectional shape of the support rod 64 is the same as the cross-sectional square shape of the protrusion 42b, and the front end surface of the support rod 64 overlaps with the front end surface of the protrusion 42b when viewed from the axial direction of the support rod 64. Match.
[0028]
As shown in FIG. 4, each of the arms 62 and 63 has a symmetrical shape with respect to a normal line to the longitudinal center of the inner wall 61a of the connecting portion 61 (that is, the axis of the support rod 64). The arm 62 is integrated with the tip of the arm 43 of the yoke 40 at the tip. Further, the arm part 63 is integrated with the tip part of the arm part 53 of the yoke part 50 at the tip part. Here, the axes of the support rods 54 and 64 intersect at the predetermined opening angle, and the tip portions of the support rods 54 and 64 are respectively connected to the magnetic poles 41b, 42b, 43b, 42c, and 43c. , 53a together with the magnetic pole of the yoke Y. Further, the tip portions of the support rods 54 and 64 and the magnetic poles 41b, 42b, 43b, 42c, 43c, and 53a are circumferentially positioned along the outer peripheral surface of the magnet rotor R at the tip surfaces thereof. The projection 53a is formed at the connecting tip of the arms 62 and 53.
[0029]
Both the coil elements Ca and Cb have a rectangular parallelepiped shape, and the coil elements Ca and Cb are accommodated and supported in the yoke portions 50 and 60, respectively, as shown in FIG.
[0030]
The coil element Ca includes a bobbin 70, both pin-shaped terminals 80, and a solenoid-shaped coil 90. The bobbin 70 is formed in a stepped cylindrical shape with a square cross section by an electrically insulating resin, and this bobbin 70 has the holding portions 70b and 70c formed coaxially at both ends in the axial direction of the winding portion 70a. Configured. The hollow portion of the bobbin 70 has a quadrangular cross-section similar to the cross-sectional shape of the support rod 54 to such an extent that the support rod 54 can be inserted into the hollow portion so as not to be relatively rotatable.
[0031]
Both holding portions 70b and 70c are of a rectangular ring shape, and the upper and lower opposing wall portions 71 (only the upper facing wall portion 71 is shown in FIG. 2) of the holding portion 70b are in their longitudinal directions (on the axis of the holding portion 70b). A central portion in the direction perpendicular to each other is cut out in a U-shape from each outer edge of the upper and lower opposing wall portions 71 to form a U-shaped escape portion 71b between both terminal portions 71a. Further, the upper and lower opposing wall portions 72 (only the upper opposing wall portion 72 is shown in FIG. 2) of the holding portion 70c are arranged in the longitudinal direction (the direction perpendicular to the axis of the holding portion 70b) at the central portion thereof. A U-shaped escape portion 72b is formed between both terminal portions 72a (only one terminal portion 72a is shown in FIG. 2) by cutting out from each outer edge of the portion 72 into a U-shape. .
[0032]
The bobbin 70 configured as described above is coaxially fitted to the support rod 54 of the yoke part 50 from the outside in the hollow part, and the bobbin 70 is provided in the yoke part 50 at the holding part 70b. The holding portion 70c is opposed to the arm portion 43 of the yoke portion 40. However, the longitudinal widths of the holding portions 70 b and 70 c of the bobbin 70 are narrower than the longitudinal width of the planar inner wall 43 a of the yoke portion 40. In addition, each width of the escape portion 71b of the holding portion 70b and the escape portion 72b of the hold portion 70c in the direction perpendicular to the axis of the bobbin 70 is wider than the width of the magnetic pole 43b.
[0033]
Also, one of the terminals 80 is one of the terminal portions 71a of the holding portion 70b, the left upper terminal portion 71a shown in FIG. 2 (the terminal portion located farther from the pointer shaft Db of both terminal portions 71a). 71a) and extends through the upper wall 31 of the casing 30 and the wiring board 20, as shown in FIGS. The other terminal 80 is connected to the left upper terminal portion 72a shown in FIG. 2 of both the terminal portions 72a of the holding portion 70c (the terminal portion 72a located farther from the axis of the pointer shaft Db of the both terminal portions 72a). As shown in FIG. 1 and FIG. 3, it is inserted and extends through the upper wall 31 of the casing 30 and the wiring board 20.
[0034]
The coil 90 is coaxially wound around the winding portion 70a of the bobbin 70, and this coil 90 is held and held by the holding portions 70b and 70c. For this reason, the outer diameter dimension of the winding part 70a is smaller than the outer diameter dimension of both the holding parts 70b and 70c. In addition, the coil 90 is wound around the tip of each terminal 80 at each winding terminal. In addition, the front-end | tip part of each terminal 80 is soldered to the corresponding | compatible wiring part on the surface of the wiring board 20 with each coil-shaped terminal of the coil 90, respectively.
[0035]
The coil element Cb includes a bobbin 70, both terminals 80, and a coil 90 corresponding to the bobbin 70 of the coil element Ca, both pin terminals 110, and a solenoid coil 120, respectively. The bobbin 100 is configured in the same manner as the bobbin 70, and the bobbin 100 is configured by forming the holding units 100b and 100c coaxially at both ends in the axial direction of the winding unit 100a.
[0036]
Both the holding parts 100b and 100c are configured in the same manner as the both holding parts 70b and 70c, and the upper and lower opposing wall parts 101 (only the upper opposing wall part 101 is shown in FIG. 2) of the holding part 100b are in their longitudinal directions. A U-shaped escape portion 101b is formed between both terminal portions 101a by cutting out the central portion (in a direction perpendicular to the axis of the holding portion 100b) from each outer edge of the upper and lower opposing wall portions 101 into a U shape. Configured. Further, the upper and lower opposite wall portions 102 (only the upper opposite wall portion 102 is shown in FIG. 2) of the holding portion 100c are arranged in the longitudinal direction (the direction perpendicular to the axis of the holding portion 100b) at the center portion of the upper and lower opposite wall walls. A U-shaped relief portion 102b is formed between both terminal portions 102a (only one terminal portion 102a is shown in FIG. 2) by cutting out from each outer edge of the portion 102 into a U shape. . Note that the hollow portion of the bobbin 100 has the same cross-sectional shape as the hollow portion of the bobbin 70.
[0037]
The bobbin 100 configured in this manner is coaxially fitted to the support rod 64 of the yoke part 60 from the outside in the hollow part, and the bobbin 100 is provided in the yoke part 60 at the holding part 100b. The holding portion 100c is opposed to the arm portion 42 of the yoke portion 40. However, the longitudinal widths of both holding portions 100b and 100c of the bobbin 100 are narrower than the longitudinal width of the connecting portion 42 of the planar inner wall 42a of the yoke portion 40. In addition, each width of the escape portion 101b of the holding portion 100b and the escape portion 102b of the holding portion 100c in the direction perpendicular to the axis of the bobbin 100 is wider than the width of the magnetic pole 42b.
[0038]
Further, both terminals 110 are the same as both terminals 80, and one of the terminals 110 is one of both terminal parts 101a of the holding part 100b, and the lower left terminal part 101a (of both terminal parts 101a shown in FIG. 2). The terminal portion 101a) is located farther away from the pointer shaft Db, and extends through the upper wall 31 of the casing 30 and the wiring board 20, as shown in FIGS. The other terminal 110 is connected to the lower left terminal portion 102a shown in FIG. 2 of both terminal portions 102a of the holding portion 100c (the terminal portion 102a located farther from the axis of the pointer shaft Db of both terminal portions 102a). As shown in FIG. 1 and FIG. 3, it is inserted and extends through the upper wall 31 of the casing 30 and the wiring board 20.
[0039]
The coil 120 is configured in the same manner as the coil 90. The coil 120 is coaxially wound around the winding portion 100a of the bobbin 100 and is held and held by the holding portions 100b and 100c. In addition, the coil 120 is wound around the tip of each terminal 120 at each winding terminal. In addition, the front-end | tip part of each terminal 110 is soldered to the corresponding | compatible wiring part of the surface of the wiring board 20 with each coil-shaped terminal of the coil 120, respectively.
[0040]
As shown in FIG. 2, the two coil elements Ca and Cb configured as described above are symmetrical to each other with reference to a line connecting the rotation axis R1 of the magnet rotor R and the pointer shaft Db in the radial direction, which will be described later. The axes of the two coil elements Ca and Cb (the axes of the bobbins 70 and 100) are substantially perpendicular to each other with respect to the rotation axis R1 of the magnet rotor R. The coil element Ca is opposed to the outer peripheral surface of the magnet rotor R at the holding portion 70c, while the coil element Cb is opposed to the outer peripheral surface of the magnet rotor R at the holding portion 100c.
[0041]
The magnet rotor R is coaxially supported on the rotation shaft R1 together with the input stage side gear G1 of the reduction gear train G in the yoke portion 40. As a result, the magnet rotor R is opposed to the magnetic poles 41b, 42b, 43b, 42c, 43c and the coil elements Ca, Cb of the yoke portion 40 on the outer peripheral surface thereof together with the coils 90, 120 and the yoke Y. A magnetic circuit is formed and rotates under the power supply through the wiring board 20 to both the coils 90 and 120. The rotation axis R1 is rotatably supported between the upper wall 31 and the bottom wall 32 of the casing 30.
[0042]
As shown in FIG. 2, the reduction gear train G includes each of the intermediate gear G2 and the output gear G3 in addition to the input gear G1, and the output gear G3 is coaxial with the pointer shaft Db. Is supported. The input stage gear G1 meshes with the output stage side gear G3 via each intermediate side gear G2. Thereby, the reduction gear train G decelerates and transmits the rotation of the magnet rotor R from the gear G1 to the gear G3.
[0043]
As shown in FIG. 1, the meter includes a light emitting pointer 130 and a plurality of light sources 140. The light emitting pointer 130 is supported at the tip end portion of the pointer shaft Db by the rotation base 131, and is a scale plate. It rotates along the surface of 10.
[0044]
Each light source 140 is formed of a light emitting diode, and each of the light sources 140 faces the rotation base 131 of the light emitting pointer 130 through the through hole portion 11 of the dial 10 near the axis of the pointer shaft Db. They are arranged on the surface of the wiring board 20 at intervals. Each light source 140 is electrically connected to a corresponding wiring portion on the surface of the wiring board 20 by soldering at each terminal.
[0045]
Thus, each light source 140 is supplied with power through the wiring board 20 to emit light, and enters the light into the rotation base 131 of the light emission indicator 130 through the through hole portion 11 of the dial 10. Each light source 140 is not limited to a light emitting diode, and may be a lamp, for example.
[0046]
In the present embodiment configured as described above, a method of assembling both the coil elements Ca and Cb to the yoke Y will be described. For example, the assembly is started from the coil element Ca. First, the casing member 30a is supported by the bottom wall 32 so as to be horizontal. Then, the yoke Y is attached along the bottom wall 32 in the casing member 30a. Next, as shown in FIG. 5, the coil element Ca is fitted between the arm portion 43 and the yoke portion 50 of the yoke portion 40 in the yoke Y so as to be positioned coaxially with the protrusion 43 b and the support rod 54. Include.
[0047]
In this fitting, as described above, the inner wall 43a of the arm portion 43 of the yoke portion 40 is formed in a planar shape. Further, the planar inner wall 43 a is positioned at right angles to the axial direction of the support rod 54 of the yoke portion 50. The protrusion 43b is coaxially positioned with the support rod 54. When the support rod 54 is viewed coaxially from the protrusion 43b side, the tip surface of the protrusion 43b coincides with the tip surface of the support rod 54 in a superimposed manner. . In addition, the longitudinal widths of the two holding portions 70 b and 70 c of the bobbin 70 are narrower than the longitudinal width of the planar inner wall 43 a of the yoke portion 40. In addition, each width of the escape portion 71b of the holding portion 70b and the escape portion 72b of the hold portion 70c in the direction perpendicular to the axis of the bobbin 70 is wider than the width of the magnetic pole 43b.
[0048]
For this reason, in the process of fitting as described above, the support rod 54 of the yoke portion 50 passes through the escape portion 71b of the holding portion 70b of the bobbin 70 of the coil element Ca at the tip portion thereof and is coaxial with the holding portion 70b. And the projection 43b of the yoke portion 40 passes through the escape portion 72b of the holding portion 70c of the bobbin 70 and is positioned coaxially with the holding portion 70c, and the holding portion 70c is the plane of the arm portion 43 at its end face. It contacts the inner wall 43a. Thus, on the assumption that the inner wall portion 43a of the arm portion 43 is formed in a flat shape, the coil element Ca is connected to the arm portion 43 and the yoke portion of the yoke portion 40 without causing interference between the holding portion 70c and the arm portion 43. 50 can be surely and smoothly fitted between them.
[0049]
After the coil element Ca is thus fitted, the hollow portion of the bobbin 70 of the coil element Ca is positioned coaxially with the support rod 54, and the cross-sectional shape of the hollow portion of the bobbin 70 is the cross-section of the support rod 54. The shape is similar to the above shape. For this reason, if the coil element Ca is moved along the axial direction of the support rod 54 so that the support rod 54 is inserted into the hollow portion of the bobbin 70, the coil element Ca is shown in FIG. In the yoke part 50, it is supported coaxially and non-rotatably by the support rod 54.
[0050]
Here, since the inner wall 43a of the arm portion 43 of the yoke portion 40 is formed in a planar shape as described above, the axial length of the bobbin 70 can be ensured appropriately, and as a result, the coil 90 of the coil element Ca. As a result, the number of windings can be properly secured.
[0051]
Next, as shown in FIG. 7, the coil element Cb is positioned coaxially with the protrusion 42 b and the support rod 64 between the arm portion 42 and the yoke portion 60 of the yoke portion 40 in the yoke Y. Fit.
[0052]
In this fitting, as described above, the inner wall 42a of the arm portion 42 of the yoke portion 40 is formed in a planar shape. Further, the planar inner wall 42 a is positioned perpendicular to the axial direction of the support rod 64 of the yoke portion 60. The protrusion 42b is coaxially positioned with the support rod 64. When the support rod 64 is viewed coaxially from the protrusion 42b side, the tip surface of the protrusion 42b coincides with the tip surface of the support rod 64 in a superimposed manner. . In addition, the longitudinal widths of the two holding portions 100 b and 100 c of the bobbin 100 are narrower than the longitudinal width of the planar inner wall 42 a of the yoke portion 40. In addition, each width of the escape portion 101b of the holding portion 100b and the escape portion 102b of the holding portion 100c in the direction perpendicular to the axis of the bobbin 100 is wider than the width of the magnetic pole 42b.
[0053]
For this reason, in the process of fitting as described above, the support rod 64 of the yoke portion 60 passes through the escape portion 101b of the holding portion 100b of the bobbin 100 of the coil element Cb at the tip portion thereof and is coaxial with the holding portion 100b. And the projection 42b of the yoke part 40 passes through the relief part 102b of the holding part 100c in the bobbin 100 and is positioned coaxially with the holding part 100c, and the holding part 100c is the plane of the arm part 42 at its end face. It contacts the inner wall 42a. As a result, on the assumption that the inner wall portion 42a of the arm portion 42 is formed in a flat shape, the coil element Cb is connected to the arm portion 42 of the yoke portion 40 and the yoke portion without causing interference between the holding portion 100c and the arm portion 42. 60 can be surely and smoothly fitted between the two.
[0054]
After the coil element Cb is fitted in this way, the hollow part of the bobbin 100 of the coil element Cb is positioned coaxially with the support rod 64, and the cross-sectional shape of the hollow part of the bobbin 100 is the cross-section of the support rod 64. The shape is similar to the above shape. For this reason, if the coil element Cb is moved along the axial direction of the support rod 64 so as to insert the support rod 64 into the hollow portion of the bobbin 100, the coil element Cb becomes as shown in FIG. In the yoke portion 60, the support rod 64 is coaxially and relatively unrotatably supported.
[0055]
Here, since the inner wall 42a of the arm portion 42 of the yoke portion 40 is formed in a flat shape as described above, the axial length of the bobbin 100 can be appropriately secured, and as a result, the coil 120 of the coil element Cb. As a result, the number of windings can be properly secured.
[0056]
Further, after assembling both the coil elements Ca and Cb to the yoke Y as described above, the pointer shaft Db and the reduction gear train G are attached to the casing member 30a as shown in FIG. Thereafter, the casing member 30b is inserted into the opening so that both terminals 80 of the coil element Ca, both terminals 110 of the coil element Cb, and the pointer shaft Db pass through the upper wall 31 of the casing member 30b as shown in FIG. And assembled to the opening of the casing member 30a. Thereby, the assembly of the internal unit main body Da is completed.
[0057]
After the completion, as shown in FIG. 1, each light source 140 is inserted into the wiring board 20 provided around the through-hole portion 21 so that the terminals 80 and 110 and the pointer shaft Db are inserted as described above. 20 is assembled on the upper wall 31 of the casing 30. Thereafter, the light emitting pointer 130 is supported by the rotating base 131 at the tip end portion of the pointer shaft Db extending through the through hole portion 11 of the dial plate 10. This completes the assembly of the instrument.
[0058]
In the instrument assembled as described above, both terminals 80 of the coil element Ca and both terminals 110 of the coil element Cb are located far away from each other in the opposite direction from the axis of the pointer axis Db. For this reason, each light source 140 for the light emission pointer 130 can be easily disposed around the through-hole portion 21 of the wiring board 20 as described above, in other words, in the vicinity of the pointer shaft Db.
[0059]
In carrying out the present invention, in the above embodiment, a translucent scale plate is adopted as the scale plate 10, a light guide plate is provided on the back surface of the translucent scale plate, and a through hole portion and a scale of the light guide plate are provided. The pointer shaft Db is extended through the through hole portion 11 of the panel 10, and the inner peripheral surface of the through hole portion of the light guide plate is formed in a tapered shape so that the light of each light source 140 is also transmitted into the light guide plate. Even if the present invention is applied to a meter configured to illuminate the translucent scale plate by introducing from the inner peripheral surface of the through-hole portion, the same effect as that of the above embodiment can be achieved.
[0060]
In this case, all the light from each light source 140 is introduced into the light guide plate from the inner peripheral surface of the through hole portion, and a normal pointer is used instead of the light emission pointer 130. The effect similar to a form can be achieved.
[0061]
In carrying out the present invention, in the above embodiment, the reduction gear train G may be eliminated, and the pointer shaft Db may be used as the rotation shaft of the magnet rotor R instead of the rotation shaft R1. In this case, the pointer shaft Db is rotatably supported on the upper and lower walls of the casing 30 at the position of the rotation shaft R1 in FIG. Therefore, in the coil element Ca, the terminal 80 provided in the holding portion 70c of the bobbin 70 out of both terminals 80 is inserted into the remaining terminal portion 71a of the holding portion 70b (the terminal portion 71a on the upper right side in FIG. 2). Then, it extends through the upper wall of the casing 30 and the wiring board 20. On the other hand, in the coil element Cb, of both terminals 110, the terminal 110 provided in the holding part 100c of the bobbin 100 is inserted into the remaining terminal part 101a of the holding part 100b (the terminal part 101a on the upper right side in FIG. 2). Then, it extends through the upper wall of the casing 30 and the wiring board 20.
[0062]
Also by this, each terminal 80 and 110 of both the coil elements Ca and Cb of the step motor M is configured to be located far away from the pointer shaft Db. Even in such a configuration, as described in the above embodiment, the assembly of both the coil elements Ca and Cb to the yoke Y can be ensured smoothly and reliably.
[0063]
In the implementation of the present invention, in the yoke Y described in the above embodiment, the arm portion 53 of the yoke portion 50 and the arm portion 63 of the yoke portion 60 are, for example, a connecting portion parallel to the connecting portion 41 of the yoke portion 40. The rod instead of the protrusion 53a may be extended from the connecting portion so that the tip of the rod functions as the magnetic pole of the protrusion 53a.
[0064]
In implementing the present invention, the step motor M described in the above embodiment is used as a drive source for rotating a shaft that rotatably supports a rotation member of various devices, without being limited to a light emission indicator of an instrument. Even if it is adopted, the assembly of both the coil elements Ca and Cb to the yoke Y can be ensured smoothly and reliably as described in the above embodiment.
[0065]
In implementing the present invention, the position of each magnetic pole of the yoke portion 40 described in the above embodiment may be changed as appropriate. For example, the protrusion 41 b of the connecting portion 41 may be eliminated, the protrusion 42 b may be provided at the boundary between the connecting portion 41 and the arm portion 42, and the protrusion 43 b may be provided at the boundary between the connecting portion 41 and the arm portion 43. In this case, at least the relief portions of the bobbins 70 and 100 are not necessary.
[0066]
In the above-described embodiment, the reduction gear train G has been described as a component different from the step motor M. However, the reduction gear train G may be a constituent member of the step motor M.
[0067]
Further, in carrying out the present invention, the present invention is not limited to passenger car instruments, but is applied to instruments for vehicles such as buses, trucks, motorcycles, etc. and having a step motor in a rotating inner unit. May be.
[Brief description of the drawings]
FIG. 1 is a partially broken schematic side view of an embodiment of a passenger car instrument according to the present invention.
2 is a plan view showing the rotating inner unit of FIG. 1 with an upper casing member removed. FIG.
FIG. 3 is a plan view of the rotating inner unit of FIG. 1;
4 is a plan view of the yoke of FIG. 2. FIG.
FIG. 5 is a plan view showing a state where a coil element Ca is placed in a yoke.
6 is a plan view showing a state in which the coil element Ca is supported in the yoke portion 50. FIG.
FIG. 7 is a plan view showing a state where the coil element Cb is placed in the yoke.
8 is a plan view showing a state in which the coil element Cb is supported in the yoke portion 60. FIG.
FIG. 9 is a plan view showing a yoke of a conventional step motor.
10 is a plan view when the coil element is assembled to the yoke of FIG. 9. FIG.
[Explanation of symbols]
Ca, Cb ... Coil element, Da ... Inner machine main body, Db ... Pointer shaft, G ... Reduction gear train,
G1, G3 ... gear, R ... magnet rotor, S ... stator, Y ... yoke,
10 ... Scale board, 11, 21 ... Through hole, 20 ... Wiring board,
40, 50, 60 ... yoke part, 41 ... coupling part, 42, 43 ... arm part, 42a, 43a ... inner wall, 54, 64 ... support rod, 70, 100 ... bobbin,
70b, 70c, 100b, 100c ... holding part,
71a, 72a, 101a, 102a ... end, 80, 110 ... terminal,
90, 120 ... coil, 130 ... light emission pointer, 131 ... rotating base,
140: Light source.

Claims

A plurality of light sources (140) that make light incident on the light emitting pointer (130) are arranged around the axis of the pointer shaft (Db), and the pointer shaft is rotated by a step motor,
The step motor is
A stator (S) having a yoke (Y) and first and second coil elements (Ca, Cb), and a magnet rotor (R);
The yoke is formed in an annular shape with a first yoke portion (40) and second and third yoke portions (50, 60) extending from the first yoke portion in a bifurcated manner,
The first yoke part includes a longitudinal connecting part (41) and both arm parts (42, 43) extending from both ends in the longitudinal direction of the connecting part,
The second yoke portion has a support rod (54) extending toward the inner wall (43a) of one of the arms (43), and the third yoke portion is the other of the arms (43a). 42) having a support rod (64) extending towards the inner wall (42a) of
The magnet rotor is rotatably supported in the yoke so that the outer surface of the magnet rotor faces the inner wall of the connecting portion of the first yoke portion, both arm portions, and the tip ends of the support rods. And
The first coil element (Ca) includes a cylindrical bobbin (70) that is coaxially supported by a support rod of the second yoke portion, and an axial end portion (70b, 70c) of the bobbin. And a coil (90) wound in a solenoid shape to form a magnetic circuit together with the magnet rotor and the yoke, and the second coil element (Cb) is coaxial with the support rod of the third yoke portion. A cylindrical bobbin (100) to be supported and a coil (120) wound around the bobbin in a solenoid shape between both axial end portions (100b, 100c) to form a magnetic circuit together with the magnet rotor and the yoke ) And
The bobbin of the first coil element has two terminal portions (71a) at one end portion in the axial direction far from the outer peripheral surface of the magnet rotor, and two terminal portions at the other end portion in the axial direction. In the bobbin of the first coil element, the two terminal portions at one end in the axial direction and the two terminal portions at the other end in the axial direction are outside the bobbin in the axial direction of the bobbin. Projecting in opposite directions toward each other,
The bobbin of the second coil element has two terminal portions (101a) at one end in the axial direction far from the outer peripheral surface of the magnet rotor, and two terminal portions at the other end in the axial direction. In the bobbin of the second coil element, the two terminal portions at one end in the axial direction and the two terminal portions at the other end in the axial direction are outside the bobbin in the axial direction of the bobbin. Projecting in opposite directions toward each other,
The inner wall of one arm portion of the first yoke portion is a planar inner wall perpendicular to the axis of the support rod of the second yoke portion, and the inner wall of the other arm portion of the first yoke portion is the third yoke. An instrument characterized by having a planar inner wall perpendicular to the axis of the support rod.

The shaft of the magnet rotor is the pointer shaft,
In the first coil element, the coil is connected to both terminals (80) provided at two terminal portions at one end in the axial direction of the bobbin of the first coil element at both terminal portions, In the second coil element, the coil is connected to both terminals (110) provided at two terminal portions of the one axial end portion of the bobbin of the second coil element at both terminal portions. The instrument according to claim 1 .

A plurality of light sources (140) that make light incident on the light emitting pointer (130) are arranged around the axis of the pointer shaft (Db), and the pointer shaft is rotated by a step motor,
The step motor is
A stator (S) having a yoke (Y) and first and second coil elements (Ca, Cb), a magnet rotor (R), and a reduction gear train (G);
The yoke is formed in an annular shape with a first yoke portion (40) and second and third yoke portions (50, 60) extending from the first yoke portion in a bifurcated manner,
The first yoke part includes a longitudinal connecting part (41) and both arm parts (42, 43) extending from both ends in the longitudinal direction of the connecting part,
The second yoke portion has a support rod (54) extending toward the inner wall (43a) of one of the arms (43), and the third yoke portion is the other of the arms (43a). 42) having a support rod (64) extending towards the inner wall (42a) of
The magnet rotor is rotatably supported in the yoke so that the outer surface of the magnet rotor faces the inner wall of the connecting portion of the first yoke portion, both arm portions, and the tip ends of the support rods. And
The reduction gear train includes an input stage gear (G1) coaxially supported by the magnet rotor and its axis, and an output stage gear (G3) coaxially supported by an output shaft parallel to the axis of the magnet rotor. )
The output shaft of the output gear is the pointer shaft,
The first coil element (Ca) includes a cylindrical bobbin (70) that is coaxially supported by a support rod of the second yoke portion, and an axial end portion (70b, 70c) of the bobbin. And a coil (90) wound in a solenoid shape to form a magnetic circuit together with the magnet rotor and the yoke, and the second coil element (Cb) is coaxial with the support rod of the third yoke portion. A cylindrical bobbin (100) to be supported and a coil (120) wound around the bobbin in a solenoid shape between both axial end portions (100b, 100c) to form a magnetic circuit together with the magnet rotor and the yoke ) And
In the first coil element, the coil is at its one terminal portion, provided on the remote terminal unit from the pointer shaft of one of the axial ends of the bobbin of the first coil element (71a) The other terminal portion connected to the terminal (80) and provided at the other terminal portion (72a) far from the pointer shaft among the other axial end portions of the bobbin of the first coil element. Connected to the terminal (80), the terminal portion and the other terminal portion project in opposite directions toward the outside of the bobbin in the axial direction of the bobbin;
In the second coil element, the coil is at its one terminal portion, provided on the remote terminal unit from the pointer shaft of one of the axial ends of the bobbin of the second coil element (101a) The other terminal portion connected to the terminal (110) and provided at the other terminal portion (102a) far from the pointer shaft among the other ends of the bobbin in the axial direction of the bobbin of the second coil element. Connected to the terminal (110), the terminal portion and the other terminal portion project in opposite directions toward the outside of the bobbin in the axial direction of the bobbin;
The inner wall of one arm portion of the first yoke portion is a planar inner wall perpendicular to the axis of the support rod of the second yoke portion, and the inner wall of the other arm portion of the first yoke portion is the third yoke. An instrument characterized by having a planar inner wall perpendicular to the axis of the support rod.

The first coil element is coaxially positioned at the bobbin between the planar inner wall of one arm portion of the first yoke portion and the tip end portion of the support rod of the second yoke portion. after being fitted in to, and a is fitted from outside along the support rod that is coaxially supported on the support rod,
On the other hand, the second coil element is coaxial with the support rod at the bobbin between the planar inner wall of the other arm portion of the first yoke portion and the tip end portion of the support rod of the third yoke portion. after being fitted to be positioned in any one of claims 1 to 3, characterized in that the is fitted from along outside the support rod in which is coaxially supported on the support rod Instrument described in.

The dial (10),
A wiring board (20) provided in parallel on the back side of the scale plate,
An internal unit body (Da) provided on the back side of the wiring board ,
It said main body has a step motor,
The pointer shaft extends from the inner machine main body through the through holes (21, 11) of the wiring board and the scale plate so as to be rotatable,
The light emitting pointer is supported by a rotation base (131) at the tip of the pointer shaft and is positioned in parallel with the surface of the dial.
The plurality of light sources are disposed around the surface of the wiring board in the vicinity of the pointer shaft and pass through a through-hole portion of the wiring board so that light enters the rotation base of the light emitting pointer. The instrument according to any one of claims 1 to 4, characterized in that: