JP2019203772A - 多回転アブソリュート型回転角検出装置及びギア - Google Patents
多回転アブソリュート型回転角検出装置及びギア Download PDFInfo
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Abstract
Description
図1には、本発明の多回転アブソリュート型回転角検出装置の一例であるエンコーダ装置10の概略構成が縦断面図にて示されている。エンコーダ装置10は、光学式の多回転アブソリュート型のエンコーダ(回転角検出装置)である。以下、図1等に示されるXYZ3次元直交座標系を適宜用いて説明する。
ギア)であり、第1シャフト12及び第2シャフト32に平行に(Z軸に平行に)配置された第3シャフト34に同軸に固定されている。すなわち、第4ギア30は、第3シャフト34と共に第3シャフト34の回転軸回りに回転する。第3シャフト34は、−Y方向から見て第2シャフト32の+X側に位置するように、図示しないハウジングにベアリングを介して回転自在に支持されている。
上記実施の形態で説明したエンコーダ装置10の構成は、適宜変更可能である。
上記実施の形態では、複数の歯17が大径部15aの外周に設けられた第1ギア14が用いられているが、これに限られない。例えば図3及び図4に示す変形例1のように、大径部56a及び小径部56bを含む被検出体56の小径部56bの外周に複数の歯54が設けられた第1ギア58を用いても良い。この場合、上記実施の形態と同様にエンコーダ装置10Aを薄型化できる。この場合、エンコーダ装置10Aを第1シャフト12の回転軸に直交する方向(X軸方向)に小型化することもできる。詳述すると、第1シャフト12と第2シャフト32の距離を短くでき(第2ギア26及び第3ギア28を小径化でき)、さらには第2シャフト32と第3シャフト34の距離を短くできる(第4ギア30を小径化できる)。図3では、複数の歯54を被検出体56の小径部56bの外周に設けたのに伴い、図1に対して、第2ギア26、第3ギア28、第4ギア30の配置を変更している。具体的には、第2ギア26と第3ギア28の位置関係を逆にし、第4ギア30を、配置変更後の第3ギア28と噛み合う位置に配置している。この場合、複数の歯が設けられる径部の径が小さいほど、エンコーダ装置10Aを幅方向(X軸方向)に小型化できる。すなわち、エンコーダ装置10Aを幅方向に小型化する観点からは、複数の歯が設けられる被検出体の径部は、該被検出体の複数の径部のうちの径が最大の径部以外の径部であることが好ましい。
上記実施の形態では、第1シャフト12に直交する方向の径が異なる2つの径部を持つ第1ギア14が用いられているが、例えば図5に示す変形例2のように1つの径部を持つもの(例えば略円板形状、略円柱形状等)であっても良いし、3つ以上の径部を持つものであっても良い。図5に示されるように第1ギア60を略円板状の被検出体62と複数の歯64とを含む、全体として略円板形状(ボス部がない形状)にする場合には、エンコーダ装置10Bの更なる薄型化を図ることができる。
上記実施の形態及び各変形例では、第1ギア14、58、60にそれぞれ係合する2段のギア列16が用いられているが、要は、第1ギア14、58、60にそれぞれ係合する1段以上のギアであれば良い。すなわち、図1や図3や図5の構成から、ギア列16の第4ギア30、第3シャフト34及び第3センサ22を取り除いた構成を採用しても良いし、ギア列16の第4ギア30に噛み合うギアを含む少なくとも1つのギアと該ギアの回転軸と該回転軸の回転角を検出するセンサを追加しても良い。
第2センサ21や第3センサ22の構成は、対応する回転軸の回転角を検出できる構成であれば他の構成であっても良い。
上記実施の形態及び各変形例では、受光部38は、複数の受光素子39を有しているが、単一の受光素子39を有していても良い。この場合、光照射部36における複数の発光素子37の発光タイミングをずらすことにより、複数の発光素子37からの光を単位光学パターンに異なるタイミングで照射することができる。これにより、信号処理部23は、各発光素子37の発光毎に受光素子39からの信号の出力の有無を判定することができる。この結果、光照射部36から光が照射されている単位光学パターンを識別できる。
光照射部36は、単一の発光素子37と該発光素子37からの光を被検出体15の径方向に偏向する光偏向器(例えばガルバノミラー、MEMSミラー等)を有し、各単位光学パターンを走査するようにしても良い。この場合、単位光学パターンの各構成部(透光部や遮光部)を走査するタイミングが異なるので、受光部38において単位光学パターンのすべての構成部に対応する単一の受光素子39を用いても良いし、単位光学パターンの複数の構成部に対応する複数の受光素子39を用いても良い。
光照射部36は、単一の発光素子37と、該発光素子37からの光を単位光学パターン全体に照射されるライン状の光に整形するシリンドリカルレンズとを有していても良い。この場合、単位光学パターンの各構成部(透光部や遮光部)に同時に光が照射されるので、単位光学パターンの複数の構成部に個別に対応する複数の受光素子39を設ける必要がある。
光学パターンLPの構成単位である単位光学パターンの構成部(透光部や遮光部)の数は、上記実施の形態及び変形例で説明した数(例えば5つ)に限定されない。いずれにしても、単位光学パターンの構成部の数に応じて発光素子37や受光素子39の数を設定することが好ましい。
変形例1〜8を矛盾しない範囲内で任意に組み合わせても良い。
[第1の発明]
第1の発明の多回転アブソリュート型回転角検出装置(10)は、第1シャフト(12)と、第1シャフト(12)に設けられ、第1シャフト(12)の回転軸回りに回転する第1ギア(14)と、第2シャフト(32)と、第2シャフト(32)に設けられ、第2シャフト(32)の回転軸回りに回転し、且つ、第1ギア(14)と噛み合う第2ギア(26)と、第1シャフト(12)の回転角を検出する第1回転角検出部(20)と、第2シャフト(32)の回転角を検出する第2回転角検出部(21)と、を備えている。そして、第1ギア(14)は、光を透過する透過性樹脂で形成され、1回転の範囲内で絶対回転角を検出するための光学パターン(LP)が形成された被検出体(15)と、被検出体(15)の外周に設けられた複数の歯(17)とを有し、第1回転角検出部(20)は、被検出体(15)に向けて光を照射する光照射部(36)と、被検出体(15)を透過した光を受光する受光部(38)と、を有する。
第2の発明のギア(14)は、多回転アブソリュート型回転角検出装置(10)に用いられるギアであって、光を透過する透過性樹脂で形成され、1回転の範囲内で絶対回転角を検出するための光学パターン(LP)が形成された被検出体(15)と、被検出体(15)の外周に設けられた複数の歯(17)と、を備えている。
12…エンコーダシャフト(第1シャフト) 14…第1ギア
15…被検出体 15a…大径部(径部)
15b…小径部(径部) 17…歯
20…第1センサ(第1回転角検出部) 21…第2センサ(第2回転角検出部)
22…第3センサ(第3回転角検出部) 26…第2ギア
28…第3ギア 30…第4ギア
32…第2シャフト 34…第3シャフト
36…光照射部 38…受光部
Claims (4)
- 第1シャフトと、
前記第1シャフトに設けられ、前記第1シャフトの回転軸回りに回転する第1ギアと、
第2シャフトと、
前記第2シャフトに設けられ、前記第2シャフトの回転軸回りに回転し、且つ、前記第1ギアと噛み合う第2ギアと、
前記第1シャフトの回転角を検出する第1回転角検出部と、
前記第2シャフトの回転角を検出する第2回転角検出部と、
を備える、多回転アブソリュート型回転角検出装置であって、
前記第1ギアは、光を透過する透過性樹脂で形成され、1回転の範囲内で絶対回転角を検出するための光学パターンが形成された被検出体と、前記被検出体の外周に設けられた複数の歯とを有し、
前記第1回転角検出部は、
前記被検出体に向けて光を照射する光照射部と、
前記被検出体を透過した光を受光する受光部と、
を有する、多回転アブソリュート型回転角検出装置。 - 請求項1に記載の多回転アブソリュート型回転角検出装置であって、
前記被検出体は、前記第1シャフトの回転軸が延びる方向に並び、該回転軸に直交する方向の径が互いに異なる複数の径部を有し、
前記複数の歯は、前記複数の径部のうちの前記径が最大の径部以外の径部の外周に設けられる、多回転アブソリュート型回転角検出装置。 - 請求項1又は2に記載の多回転アブソリュート型回転角検出装置であって、
前記第2シャフトに設けられ、前記第2シャフトの回転軸回りに回転し、前記第2ギアより径の小さい第3ギアと、
第3シャフトと、
前記第3シャフトに設けられ、前記第3シャフトの回転軸回りに回転し、且つ、前記第3ギアと噛み合う第4ギアと、
前記第3シャフトの回転角を検出する第3回転角検出部と、
をさらに備える、多回転アブソリュート型回転角検出装置。 - 多回転アブソリュート型回転角検出装置に用いられるギアであって、
光を透過する透過性樹脂で形成され、1回転の範囲内で絶対回転角を検出するための光学パターンが形成された被検出体と、
前記被検出体の外周に設けられた複数の歯と、
を備える、ギア。
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JP2018098625A JP2019203772A (ja) | 2018-05-23 | 2018-05-23 | 多回転アブソリュート型回転角検出装置及びギア |
DE102019003586.0A DE102019003586A1 (de) | 2018-05-23 | 2019-05-21 | Detektionsvorrichtung für einen absoluten Drehwinkel bei Mehrfachdrehung und Zahnrad |
CN201910431222.1A CN110530294A (zh) | 2018-05-23 | 2019-05-22 | 多旋转绝对型旋转角检测装置以及齿轮 |
US16/419,418 US20190360845A1 (en) | 2018-05-23 | 2019-05-22 | Multi-rotational absolute rotation angle detecting device and gear |
CN201920746586.4U CN209727060U (zh) | 2018-05-23 | 2019-05-22 | 多旋转绝对型旋转角检测装置以及齿轮 |
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WO2000040419A1 (fr) * | 1999-01-07 | 2000-07-13 | Seiko Epson Corporation | Mecanisme de detection, dispositif de controle de chariot et imprimante comprenant ces elements |
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- 2018-05-23 JP JP2018098625A patent/JP2019203772A/ja active Pending
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2019
- 2019-05-21 DE DE102019003586.0A patent/DE102019003586A1/de not_active Withdrawn
- 2019-05-22 US US16/419,418 patent/US20190360845A1/en not_active Abandoned
- 2019-05-22 CN CN201920746586.4U patent/CN209727060U/zh not_active Expired - Fee Related
- 2019-05-22 CN CN201910431222.1A patent/CN110530294A/zh active Pending
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JPH0493611A (ja) * | 1990-08-03 | 1992-03-26 | Mitsubishi Electric Corp | 位置検出装置 |
JPH1047996A (ja) * | 1996-07-31 | 1998-02-20 | Seibu Electric & Mach Co Ltd | ロータリーエンコーダ |
WO2000040419A1 (fr) * | 1999-01-07 | 2000-07-13 | Seiko Epson Corporation | Mecanisme de detection, dispositif de controle de chariot et imprimante comprenant ces elements |
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JP2009300223A (ja) * | 2008-06-12 | 2009-12-24 | Delta Electronics Inc | 絶対型エンコーダ装置とその操作方法 |
JP2012145518A (ja) * | 2011-01-14 | 2012-08-02 | Iai:Kk | エンコーダ、モータユニット、及びアクチュエータシステム |
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CN209727060U (zh) | 2019-12-03 |
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