JP3929943B2

JP3929943B2 - Optical zoom mechanism and camera

Info

Publication number: JP3929943B2
Application number: JP2003187038A
Authority: JP
Inventors: 方博城野
Original assignee: Kyocera Corp
Current assignee: Kyocera Corp
Priority date: 2003-06-30
Filing date: 2003-06-30
Publication date: 2007-06-13
Anticipated expiration: 2023-06-30
Also published as: JP2005024636A

Description

【０００１】
【発明の属する技術分野】
この発明は、光学系をズ−ミング移動させるカムやリ−ドスクリュなどの動力機構と、この動力機構を駆動するモ−タとの連動系に備える減速装置を有する光学ズ−ム機構及びカメラに関する。
【０００２】
【従来の技術】
最近のカメラは、撮影レンズのズ−ミングの他に、ズ−ミング機能を有するファインダやフラッシュ装置を備えたものが多い。
そして、ズ−ミングはモ−タ駆動されるカムやリ−ドスクリュを備える動力機構によって変倍レンズを移動する構成となっている。
【０００３】
一例として撮影レンズのズ−ミング構成について述べると、光軸方向に移動させてズ−ミングする撮影レンズの横位置に筒状のズ−ム用カムを配設し、このズ−ム用カムのカム溝に撮影レンズのカムピンを挿入して連動駆動するようになっている。
【０００４】
また、ズ−ム用カムの前方側或いは後方側にズ−ム用モ−タを配置し、さらに、このモ−タとズ−ム用カムとの間に減速装置を配置し、モ−タ出力を減速装置で減速してズ−ム用カムに伝達し、ズ−ム用カムを回転駆動する構成となっている。
【０００５】
減速装置は、モ−タピニオンに噛合した初段の減速歯車の他に多数の減速歯車を備え、終段の減速歯車をズ−ム用カムに設けられている歯車に噛合させてある。
【０００６】
【特許文献１】
特開２００１−１３３６７５号公報
【０００７】
【発明が解決しようとする課題】
上記した減速装置は、カムやリ−ドスクリュなどの動力機構とモ−タとの連動系に多数の減速歯車を集中的に設けた歯車構成となるため、カメラ形態が小型化し、薄型化するほど減速装置の配置と組込みスペ−スに制限が生じ、歯車構成が複雑化したものとなる。
【０００８】
また、多数の減速歯車を集中的に配置すると、減速装置がどうしても大きくなるため、特に、カメラ形態を薄型化する場合に減速装置の組込みスペ−スが問題となり、カメラの薄型設計に限界をもたらすと言う問題がある。
【０００９】
本発明は上記した実情にかんがみ、小型カメラ、薄型カメラについても充分に組込むことができるようにしたこの種の減速装置を備えた光学ズ−ム機構及びカメラを提案することを目的とする。
【００１０】
【課題を解決するための手段】
上記した目的を達成するため、本発明では、第１の発明として、レンズ保持枠のカム溝挿入部材をモ−タ駆動するカム体のカム溝に挿入させて変倍レンズを移動しズ−ミングを行なう光学ズ−ム機構において、両端部に歯車を設けた回転軸杆と、前記回転軸杆の一端側に設けた歯車に噛合する第１の減速歯車群と、前記回転軸杆の他端側に設けた歯車に噛合する第２の減速歯車群と、前記第２の減速歯車群を駆動するモ−タと、前記第１の減速歯車群により駆動される円筒形のカム体とを設け、前記した円筒形のカム体と回転軸杆とを前記変倍レンズの側方に並列に配設すると共に、これら円筒形のカム体、回転軸杆と、前記モ−タの回転軸との回転軸心方向を前記変倍レンズの光軸方向として配設し、さらに、前記変倍レンズの光軸方向において、前記カム体を前記モータの前記第２の減速歯車群との非噛合端から前記回転軸杆の一端までの長さよりも短くし、かつ前記カム体の前記第１の減速歯車群との噛合端が前記回転軸杆の一端よりも前記モータ側となるように配設して構成したことを特徴とする光学ズ−ム機構を提案する。
【００１１】
第２の発明は、上記した第１の発明の光学ズ−ム機構において、前記カム体は、カム溝の一側カム面を形成した一方のカム枠と、前記カム枠に非回転として摺動自在に備え、前記一側カム面に対向させる他側カム面を形成した他方のカム枠とからなり、一方のカム枠又は／及び他方のカム枠を押圧してカム溝挿入部材をカム面に当接させる付勢手段を備えた光学ズ−ム機構を提案する。
【００１２】
第３の発明は、上記した第１の発明の光学ズ−ム機構において、前記カム体は、螺旋状の第１カム溝と、螺旋状の第２カム溝と、円柱体の両側部各々に設けた細径状の摺動部と、一方側の摺動部と円柱体の胴部との間の段部に設けた第１カム溝の一側カム面と、他方の摺動部と円柱体の胴部との間の段部に設けた第２カム溝の一側カム面とを有するカム基体と、第１カム溝の一側カム面に対向させる他側カム面を形成し、一方の摺動部に非回転として摺動自在に備えた第１のカム枠と、第２カム溝の一側カム面に対向させる他側カム面を形成し、他方の摺動部に非回転として摺動自在に備えた第２のカム枠とからなり、第１のカム枠と第２のカム枠を押圧し、第１のカム枠と第２のカム枠とカム基体とで形成された２条のカム溝に挿入する前記カム溝挿入部材をカム面に当接させる付勢手段を備えた光学ズ−ム機構を提案する。
【００１３】
第４の発明は、上記した第１の発明の光学ズ−ム機構において、前記カム体は、螺旋状の第１カム溝と、螺旋状の第２カム溝と、円柱体の一端側に設けた細径状の摺動部と、摺動部と円柱体の胴部との間に設けた段部である第１カム溝の一側カム面と、を有する一方の基体部と、円柱体の他端側に設けた細径状の摺動部と、摺動部と円柱体の胴部との間に設けた段部である第２カム溝の一側カム面と、を有する他方の基体部と、前記一方の基体部と前記他方の基体部とを連結して構成したカム基体と、第１カム溝の一側カム面に対向させる他側カム面を形成し、一方の摺動部に非回転として摺動自在に備えた第１のカム枠と、第２カム溝の一側カム面に対向させる他側カム面を形成し、他方の摺動部に非回転として摺動自在に備えた第２のカム枠とからなり、第１のカム枠と第２のカム枠を押圧し、第１のカム枠と第２のカム枠とカム基体とで形成された２条のカム溝に挿入する前記カム溝挿入部材をカム面に当接させる付勢手段を備えた光学ズ−ム機構を提案する。
【００１４】
第５の発明は、レンズ保持枠のカム溝挿入部材をモ−タ駆動するカム体のカム溝に挿入させて変倍レンズを移動させることにより撮像素子に合焦する撮像画像のズ−ミングを行なう光学ズ−ム機構を備えたカメラにおいて、両端部に歯車を設けた回転軸杆と、前記回転軸杆の一端側に設けた歯車に噛合する第１の減速歯車群と、前記回転軸杆の他端側に設けた歯車に噛合する第２の減速歯車群と、前記第２の減速歯車群を駆動するモ−タと、前記第１の減速歯車群により駆動される円筒形のカム体とを設け、前記した円筒形のカム体と回転軸杆とを前記変倍レンズの側方に並列に配設すると共に、これら円筒形のカム体、回転軸杆と、前記モ−タの回転軸との回転軸心方向を前記変倍レンズの光軸方向として配設し、さらに、前記変倍レンズの光軸方向において、前記カム体を前記モータの前記第２の減速歯車群との非噛合端から前記回転軸杆の一端までの長さよりも短くし、かつ前記カム体の前記第１の減速歯車群との噛合端が前記回転軸杆の一端よりも前記モータ側となるように配設して構成したことを特徴とする光学ズ−ム機構を備えたカメラを提案する。
【００１５】
第６の発明は、上記した第５の発明のカメラにおいて、前記カム体は、カム溝の一側カム面を形成した一方のカム枠と、前記カム枠に非回転として摺動自在に備え、前記一側カム面に対向させる他側カム面を形成した他方のカム枠とからなり、
一方のカム枠又は／及び他方のカム枠を押圧してカム溝挿入部材をカム面に当接させる付勢手段を備えたカメラを提案する。
【００１６】
第７の発明は、上記した第５の発明のカメラにおいて、前記カム体は、螺旋状の第１カム溝と、螺旋状の第２カム溝と、円柱体の両側部各々に設けた細径状の摺動部と、一方側の摺動部と円柱体の胴部との間の段部に設けた第１カム溝の一側カム面と、他方の摺動部と円柱体の胴部との間の段部に設けた第２カム溝の一側カム面とを有するカム基体と、第１カム溝の一側カム面に対向させる他側カム面を形成し、一方の摺動部に非回転として摺動自在に備えた第１のカム枠と、第２カム溝の一側カム面に対向させる他側カム面を形成し、他方の摺動部に非回転として摺動自在に備えた第２のカム枠とからなり、第１のカム枠と第２のカム枠を押圧し、第１のカム枠と第２のカム枠とカム基体とで形成された２条のカム溝に挿入する前記カム溝挿入部材をカム面に当接させる付勢手段を備えたカメラを提案する。
【００１７】
第８の発明は、上記した第５の発明のカメラにおいて、前記カム体は、螺旋状の第１カム溝と、螺旋状の第２カム溝と、円柱体の一端側に設けた細径状の摺動部と、摺動部と円柱体の胴部との間に設けた段部である第１カム溝の一側カム面と、を有する一方の基体部と、円柱体の他端側に設けた細径状の摺動部と、摺動部と円柱体の胴部との間に設けた段部である第２カム溝の一側カム面と、を有する他方の基体部と、前記一方の基体部と前記他方の基体部とを連結して構成したカム基体と、第１カム溝の一側カム面に対向させる他側カム面を形成し、一方の基体部の摺動部に非回転として摺動自在に備えた第１のカム枠と、第２カム溝の一側カム面に対向させる他側カム面を形成し、他方の基体部の摺動部に非回転として摺動自在に備えた第２のカム枠とからなり、第１のカム枠と第２のカム枠を押圧し、第１のカム枠と第２のカム枠とカム基体とで形成された２条のカム溝に挿入する前記カム溝挿入部材をカム面に当接させる付勢手段を備えたカメラを提案する。
【００１８】
第９の発明は、上記した第５の発明のカメラにおいて、モ−タ駆動によって移動してフォ−カシングするフォ−カス用レンズを備えると共に、フォ−カス用モ−タを前記第１の減速歯車群の近傍に、ズ−ミングする前記モ−タを前記第２の減速歯車群の近傍に各々配設し、かつ、前記フォ−カス用モ−タの回転軸の回転軸方向を前記変倍レンズの光軸方向として配設したことを特徴とする光学ズ−ム機構を備えたカメラを提案する。
【００１９】
上記した光学ズ−ム機構及びカメラは、モ−タ始動させると、先ず、第１の減速歯車群が回転駆動され、この回転駆動力が回転軸杆に伝達されるから、この回転軸杆に連動する第２の減速歯車群が回転駆動力を受ける。
したがって、動力機構が第２の減速歯車群に連動されて回転し、光学系をズ−ミング移動させる。
また、このように構成した光学ズ−ム機構及びカメラは、第１、第２の減速歯車群を２つの歯車群に分けてあるので、第１、第２の減速歯車群各々の歯車構造が大きくならなく、その上、円筒形のカム体や回転軸杆などの軸心方向を光軸方向として配設したので、各々の組込みスペ−スを狭くすることができ、小型化、薄型化するカメラについても充分に組込むことができるものとなる。
さらに、多数の歯車を第１、第２の減速歯車群に分けているため、歯車構成が複雑とならず、歯車配置の自由度もある。
【００２０】
【発明の実施の形態】
次に、本発明を電子カメラに実施した第１の実施形態について図面に沿って説明する。
図１は撮影レンズのズ−ミング駆動機構２０を示す斜視図、図２は同ズ−ミング駆動機構２０の正面図である。
【００２１】
これらの図面において、２１は第１レンズ群、２２は第２レンズ群を示し、これら第１、第２レンズ群２１、２２はそれらのレンズ枠２１ａに設けたボス２１ｂと、レンズ枠２２ａに設けたボス２２ｂとにガイド軸２３を摺動自在に軸挿させ、第１、第２レンズ群２１、２２をガイド軸２３によって支持させてある。
【００２２】
また、ボス２１ｂ、２２ｂとは反対となるレンズ枠２１ａ、２２ａの位置には孔部（図示省略）を設け、これらの孔部に摺動杆２４を摺動自在に軸挿させ、第１、第２レンズ群２１、２２の回り止めを行なう構成としてある。
【００２３】
さらに、上記のボス２１ｂに突出形成した第１レンズ群２１のカムピン（カム溝挿入部材）２１ｃとボス２２ｂに突出形成した第２レンズ群２２のカムピン（カム溝挿入部材）２２ｃとがズ−ム用カム２５のカム溝に挿入させてあり、第１、第２レンズ群２１、２２をズ−ム用カム２５の回転にしたがって光軸方向にカム送りする。（図３参照）
なお、ズ−ム用カム２５はズ−ム用モ−タ２６によって回転駆動される。
【００２４】
上記したガイド軸２３と摺動杆２４の一端側は前固定枠２７に、他端側は後固定枠２８に各々固着してあり、ズ−ム用カム２５は前固定枠２７の軸受部２７ａと、後固定枠２８に固着された支持固定枠２９の軸受部２９ａ（図６参照）とによって回転自在に支持してある。
【００２５】
なお、前固定枠２７と後固定枠２８とには被写体像光を通過させる窓孔２７ｂ、２８ａを形成し、さらに、後固定枠２８の窓孔直後にはＣＣＤ（固体撮像素子）３０が組込んである。（図１、図３参照）
【００２６】
他方、図１に示す第３レンズ群３１はフォ−カス用レンズで、そのレンズ枠３１ａに設けたボス３１ｂにはガイド軸２３を軸挿させてこの第３レンズ群３１を支持させてある。
第３レンズ群３１は、レンズ枠３１ａの一部に設けたナットねじ３２がフォ−カス用モ−タ３３によって回転駆動されるリ−ドスクリュ３４によってねじ送りされることで、光軸方向に進退移動する。
【００２７】
その他、図１に示す参照符号３５はレンズ枠２２ａに取付けたシャッタユニット、３６はカバ−板、３７はカバ−板に取付けたズ−ム用フォトインタラプタ、３８はフォ−カス用フォトインタラプタ、３９は第３レンズ群３１のガタ防止用のスプリングであり、ボス３１ｂを一方向に付勢することにより、リ−ドスクリュ３４とナット３２等のガタを吸収する。
ズ−ム用フォトインタラプタ３７はズ−ミングの初期位置を検出し、フォ−カス用フォトインタラプタ３８はフォ−カシングの初期位置を検出する。
【００２８】
上記のように構成した撮影レンズのズ−ミング駆動機構２０は、ズ−ム用モ−タ２６によりズ−ム用カム２５を回転駆動することで、第１、第２レンズ群２１、２２がガイド軸２３に沿って移動してズ−ミングが行なわれ、また、フォ−カス用モ−タ３３によりリ−ドスクリュ３４を回転駆動することで、ナットねじ３２がねじ送りされ、第３レンズ群３１が移動してフォ−カシングが行なわれる。
なお、第３レンズ群３１はズ−ミング時にも移動するようになっている。
【００２９】
一方、上記したズ−ミング駆動機構２０にカム装置として備えているズ−ム用カム２５について、図３、図４、図５を参照して説明する。
図３は、第３レンズ群３１、フォ−カス用モ−タ３３、シャッタユニット３５、カバ−板３６などを取り外して示した図１同様のズ−ミング駆動機構２０の斜視図、図４はズ−ム用カム２５の斜視図、図５はズ−ム用カムの分解斜視図である。
【００３０】
図示するように、ズ−ム用カム２５は、第１カム溝４０と第２カム溝４１を有する円筒形カムで、円筒状のカム基体２５１と、このカム基体２５１の両側に摺動自在に嵌合させる円筒状のカム枠２５２、２５３と、これらカム枠２５２、２５３を近づく方向に押圧する引張り勢力のコイルばね２５４とより構成してある。
【００３１】
カム基体２５１は、その胴部２５１ａ両側を細径状とした摺動部２５１ｂ、２５１ｃを設け、胴部２５１ａと摺動部２５１ｂとの間の段部を第１カム溝４０を形成するための一側カム面４０ａとして形成し、胴部２５１ａと摺動部２５１ｃとの間の段部を第２カム溝４１を形成するための一側カム面４１ａとして形成してある。
【００３２】
また、カム基体２５１には、両側端から筒軸方向に沿って形成した長形孔２５１ｄ、２５１ｅを設け、これらの長形孔２５１ｄ、２５１ｅに、カム枠２５２、２５３の突片部２５２ａ、２５３ａを摺動自在に嵌合させるようにして、カム枠２５２、２５３をカム基体２５１と一体的に回転させるようにしてある。
なお、カム基体２５１の胴部２５１ａに形成した孔部２５１ｆはコイルばね２５４を取付けるためのものであり、また、摺動部２５１ｂ、２５１ｃの端部に形成した段差部２５１ｇ、２５１ｈは、カム枠２５２、２５３の移動を規制するものである。
【００３３】
他方、カム枠２５２は、一端円周部を第１カム溝４０の他側カム面４０ｂとして形成してあり、また、その他端には内向きのフランジ２５２ｂが形成してある。
さらに、このカム枠２５２には、上記した突片部２５２ａより筒内に突出させたばね掛け部２５２ｃが設けてある。
【００３４】
カム枠２５３は、一端円周部を第２カム溝４１の他側カム面４１ｂとして形成してあり、また、その他端には内向きのフランジ２５３ｂが形成してある。
さらに、このカム枠２５３には、上記した突片部２５３ａより筒内に突出させたばね掛け部２５３ｃが設けてある。
【００３５】
上記のように形成したカム基体２５１、カム枠２５２、２５３は、カム枠２５２をカム基体２５１の摺動部２５１ｂに嵌合し、カム枠２５３を摺動部２５１ｃに嵌合させた後、コイルばね２５４の一端部をカム枠２５２のばね掛け部２５２ｃに、その他端部をカム枠２５３のばね掛け部２５３ｃに各々係止する。
【００３６】
コイルばね２５４はカム枠２５２、２５３を近づける方向に押圧するため、カム枠２５２が摺動部２５１ｂを摺動し、そのフランジ部２５２ｂがカム基体２５１の段差部２５１ｇに突き当るまで進み、この状態で一側カム面４０ａと他側カム面４０ｂとによって第１カム溝４０が形成される。
【００３７】
同様に、カム枠２５３が摺動部２５１ｃを摺動し、そのフランジ部２５３ｂが段差部２５１ｈに突き当り、この状態で一側カム面４１ａと他側カム面４１ｂとによって第２カム溝４１が形成される。
このように形成されたカム溝４０、４１は、ズ−ミングに必要な第１、第２レンズ群２１、２２の移動に合せた螺旋状カム溝として形成することができる。
【００３８】
上記のように構成したズ−ム用カム２５は、図３に示した如く、第１カム溝４０に第１レンズ群２１のカムピン２１ｃを挿入（突入）させ、第２カム溝４１に第２レンズ群２２のカムピン２２ｃを挿入（突入）させる。
このように、カムピン２１ｃ、２２ｃを挿入すると、カム枠２５２のフランジ部２５２ｂが段形部２５１ｇより僅か後退し、同様にカム枠２５３のフランジ部２５３ｂも段形部２５１ｈより僅か後退するようになる。
【００３９】
したがって、カムピン２１ｃがカム枠２５２のカム面４０ｂに押圧され、カムピン２２ｃがカム枠２５３のカム面４１ｂによって押圧されるため、これらカムピン２１ｃ、２２ｃがカム溝４０、４１の全域において一定の圧接力でカム面に当接するようになる。
【００４０】
また、カムピン２１ｃ、２２ｃのカム面に対する圧接力はコイルばね２５４の引張り勢力によって決めることができるから、コイルばね２５４として適度の引張り勢力を有するものを選べばカムピン２１ｃ、２２ｃを最適な圧接力とすることができる。
【００４１】
したがって、ズ−ム用カム２５は一定のモ−タ駆動力で回転させることができ、また、第１、第２レンズ群２１、２２の移動駆動もスム−ズに行なうことができる。
この結果、ズ−ム用カム２５が変動の少ない軽負荷のカム装置となるので、ズ−ム用モ−タ２６としては電力消費の少ない小型モ−タを使用することができる。
【００４２】
図６は図２上のＡ−Ａ線で切断し、ズ−ム用カム２５の断面とその駆動系を示した断面図である。
図示する如く、ズ−ム用カム２５の後端側には内歯車４２が設けてあり、この内歯車４２の突出部４２ａがカム基体２５１の内孔に突入し、また、その突出部４２ａの周囲部に設けたキ−４２ｂがカム基体２５１の内孔部に形成したキ−溝２５１ｉに嵌合している。
これより、ズ−ム用カム２５が内歯車４２と一体的に回転する。
【００４３】
また、内歯車４２は支持固定枠２９に設けた軸受部２９ａに回転自在に支持され、さらに、この内歯車４２には連動小歯車４３が噛合している。
この連動小歯車４３は減速装置４４を介してズ−ム用モ−タ２６によって回転駆動するもので、内歯車４２を回転し、ズ−ム用カム２５を回転させる。
【００４４】
上記のように実施する撮影レンズのズ−ミング駆動機構２０は、カムピン２１ｃ、２２ｃが第１、第２カム溝４０、４１の全域で一定の圧接力となるズ−ム用カム２５となる他に、このズ−ム用カム２５と同芯線上にズ−ム用モ−タ２６を配設したので、カメラの横方向の幅（図２において左右方向の幅）を短縮することができ、さらに、変倍用の第１、第２レンズ群２１、２２とフォ−カス用の第３レンズ群３１とを同一のガイド軸２３によって支持させて移動させる構成としたので、レンズ群の偏心、倒れが生じにくいものとなる。
【００４５】
図７は第２実施形態として示したズ−ミング駆動機構５０を示す。
このズ−ミング駆動機構５０は、カム枠２５２、２５３に形成した他側カム面４０ｂ、４１ｂを所定の角度で傾斜させたことが特徴となっており、その他は図１〜図６に示したズ−ミング駆動機構２０と同構成となっている。
なお、図７は図２上のＢ−Ｂ線に沿った断面図に相当する。
図８は第１、第２カム溝４０、４１とカムピン２１ｃ、２２ｃとの構成部分を拡大して示す断面図であり、この図より分かる通り、第１、第２カム枠２５２、２５３の他側カム面４０ｂ、４１ｂは、枠外周面に向かって昇り勾配とした傾斜のカム面として形成してある。
【００４６】
他側カム面４０ｂ、４１ｂをこのように傾斜面とすることにより、カムピン２１ｃ、２２ｃが図示Ｆ１方向の押動力を受ける。
すなわち、第１、第２カム枠２５２、２５３にはコイルばね２５４によって図示Ｆ２方向のばね勢力が作用することから、他側カム面４０ｂ、４１ｂの傾斜面により押動されるカムピン２１ｃ、２２ｃが、一側カム面４０ａ、４１ａに圧接する力の他に、カム溝の回転軸線に対して直交する方向となる押動力Ｆ１を受ける。
【００４７】
カムピン２１ｃ、２２ｃに作用する上記の押動力Ｆ１は、ボス２１ｂ、２２ｂの支軸孔２１ｄ、２２ｄ（図８参照）の孔面部をガイド軸２３に当接させるように働き、これによって支軸孔２１ｄ、２２ｄとガイド軸２３との機械的遊びが吸収されるようになる。
【００４８】
上記のように構成したズ−ム用カム２５は、カムピン２１ｃ、２２ｃが第１、第２カム溝４０、４１の全域で一定の圧接力で当接し、これらカムピン２１ｃ、２２ｃをズ−ム用カム２５の回転にしたがってカム溝の回転軸線方向（図７、図８において左右方向）に移動駆動し、第１、第２レンズ群２１、２２をガイド軸２３に沿って移動させる。
【００４９】
また、上記したようにボス２１ｂ、２２ｂが機械的遊びがなくガイド軸２３を摺動することから、第１、第２レンズ群２１、２２に傾きや偏心が生じない。
この結果、ズ−ミング精度を高めることができるズ−ム用カム２５（カム装置）を備えたズ−ミング駆動機構となる。
【００５０】
図９（Ａ）、（Ｂ）、（Ｃ）は、第１、第２カム溝４０、４１のカム面傾斜位置を変えた他の実施形態を示す図８同様の断面図である。
図９（Ａ）は、第１、第２カム溝４０、４１の一側カム面４０ａ、４１ａを傾斜形成した実施形態、図９（Ｂ）は、第１、第２カム溝４０、４１の一側カム面４０ａ、４１ａと他側カム面４０ｂ、４１ｂとの両カム面を傾斜形成した実施形態、図９（Ｃ）は、第１、第２カム溝４０、４１の他側カム面４０ｂ、４１ｂとカムピン２１ｃ、２２ｃとを傾斜形成した実施形態である。
【００５１】
このように構成してもカムピン２１ｃ、２２ｃには押動力Ｆ１が作用するから、図８に示す実施形態と同様にボス２１ｂ、２２ｂとガイド軸２３との機械的遊びを吸収することができ、第１、第２レンズ群２１、２２の傾きや偏心を防止することができる。
また、図９（Ｂ）に示した構成のように両カム面を傾斜形成することにより、一方のカム面を傾斜形成したものに比べよりスム−ズなズ−ム機構動作を実現することができる。
なお、図８、図９（Ａ）、（Ｂ）に示す実施形態においても、カム面に当接するカムピン２１ｃ、２２ｃの当接部を傾斜形成してもよい。
【００５２】
図１０は、上記したズ−ミング駆動機構５０において、ズ−ム用カム２５の軸受けガタを吸収するために、前固定枠２７の軸受部２７ａにコイルばね４５を設けた実施形態を示す。
このコイルばね４５は、ズ−ム用カム２５を一方向に押圧してズ−ム用カム２５の回転軸方向の働きを防止し、第１、第２レンズ群２１、２２の移動位置精度を高めるものである。
【００５３】
図１１は、前固定枠２７の軸受部２７ａに一つのコイルばね４６を設け、このコイルばね４６によって第１、第２カム枠２５２、２５３を押圧すると共に、ズ−ム用カム２５の軸受けガタを吸収する実施形態を示す。
【００５４】
この実施形態は、第１のカム枠２５２を押圧することで、カムピン２１ｃを介してカム基体２５１を押圧し、また、カムピン２２ｃを介して第２のカム枠２５３を一方向に押圧する構成としてある。
このように構成することにより、第１、第２カム枠２５２、２５３に係架したコイルばね２５４が不要となる。
【００５５】
図１２〜図１４は上記したところのズ−ミング駆動機構２０、５０と同様のズ−ミング駆動機構を鏡筒を備えず、鏡筒レスとした電子カメラ（デジタルカメラ）の一例を示す。
なお、図１２はカメラ平面図、図１３はカメラ正面図、図１４はカメラ背面図である。
【００５６】
図示するように、この電子カメラは正面から見て、横幅、縦幅を広く奥行き幅を狭くした薄型のカメラ形態となっている。
また、この電子カメラは、コントロ−ラ、メモリカ−ド、演算部、メモリカ−ド収納部などを備えたカメラ本体部６０と撮影レンズなどを備えた光学系収納部６１とを別体のボックス状体として構成してある。
そして、カメラ本体部６０と光学系収納部６１は連結部６２によって適度の節度をもって回転できるように連結してある。
【００５７】
なお、図示するように、カメラ本体部６０の上面には、シャッタボタン６３、電源スイッチ６４を設け、また、カメラ本体部６０の背面には、液晶モニタ６５、選択・決定ボタン６６、ズ−ムボタン６７、モ−ド選択ボタン６８などが設けてあり、更に、図示しないカメラ本体部６０内部には、ＣＰＵを含む各種回路基板、電源を供給するバッテリ−、メモリカ−ド収納部が収納してある。
さらに、光学系収納部６１の上面には、撮影レンズ窓６９とフラッシュユニットの発光窓７０などが設けてあり、内部には、ズ−ミング機構部２０、５０、９０、後述するフラッシュユニット８０を遮光して収納してある。
このように、カメラ本体部６０には、表示部、操作部、バッテリ−、メモリカ−ド収納部、回路基板を集約して配置すると共に、光学系収納部６１には、光学機構、フラッシュユニット８０を集約して配置することにより、カメラ全体の薄型化を実現している。
【００５８】
上記した電子カメラは極く薄形のカメラ形態であることから携帯に便利である。
一方、撮影する場合には、図１５に一例として示したように、撮影レンズ窓６９が正面を向くように光学系収納部６１を回転させる。
この状態でカメラ本体部６０を手で握りシャッタレリ−ズすることができるので、カメラ振れの極めて少ないカメラとなる。
また、図１５とは逆側に光学系収納部６１を回転させ、液晶モニタ６５と同方向を撮影することもできる。
【００５９】
図１６はリアケ−ス（カメラケ−ス）を取り外して内部構成を示した上記光学系収納部６１の斜視図、図１７はその光学系収納部６１の横断面図、図１８は当該光学系収納部６１の分解斜視図である。
これらの図面から分かるように、光学系収納部６１は、フラッシュユニット８０と撮影レンズのズ−ミング駆動機構（光学系ユニット）９０とを箱状のフロントケ−ス（カメラケ−ス）７１内に組付け鏡筒を具備しない鏡筒レスとし、上記ユニット等を遮光して収納する。
よって、光学系収納部６１は薄型に形成した光学系ユニットの高さ寸法により規制される厚さに抑えられ、カメラの薄型化を実現できる構成となっている。
【００６０】
フラッシュユニット８０は、発光窓７０内に配設した発光部８１、フロントケ−ス７１内の最奥部であつて、光学系ユニットの後方に隣接配置したメインコンデンサ８２、フロントケ−ス７１内の光学系ユニット側部に隣接配設した配線基板８３などから構成してある。
【００６１】
また、ズ−ミング駆動機構９０は、小ねじ９１によってフロントケ−ス７１内にねじ止めして配置してあり、撮影レンズ窓６９から第１、第２、第３レンズ群２１、２２、３１からなる撮像光学系に撮影像光が入光するようになっている。
なお、このズ−ミング駆動機構９０には半田屑や塵などの侵入を防ぐカバ−９２が設けてある。
【００６２】
上記のように、フラッシュユニット８０とズ−ミング駆動機構９０を組付けたフロントケ−ス７１にはリアケ−ス７２をねじ止めする。
具体的には図１８に示した如く、リアケ−ス７２の一方側にフロントケ−ス７１から差し入れる小ねじ９３によってねじ止めし、また、リアケ−ス７２の他方側は連結部６２の一方舌片６２ａによってねじ止めする。
【００６３】
すなわち、連結部６２の一方舌片６２ａをフロントケ−ス７１とリアケ−ス７２とに小ねじ７３によって止着しこれらケ−ス７１、７２を一体的に固着する。
なお、連結部６２の他方舌片６２ｂはカメラ本体部６０のケ−スにねじ止めするもので、その管状部６２ｃによってカメラ本体部６０と光学系収納部６１と回転自在に連結すると共に、これらの間の電気配線を行なうようになっている。
その他、図１８に示した９４はカム押動ピン、９５はカムスプリング、９６は撮像ユニットであるが、これらについては後述する。
【００６４】
上記のように構成した光学系収納部６１は、特にレンズ鏡筒を設ける必要がなく、レンズ口径に合せた奥行幅とすることができるので、極薄型の電子カメラに適するものとなる。
【００６５】
図１９は上記したズ−ミング駆動機構９０の斜視図である。
このズ−ミング駆動機構９０は既に述べたところのズ−ミング駆動機構２０、５０と同様の構成となっているが、ただ、このズ−ミング駆動機構９０はズ−ム用カム２５を撮影レンズ群の左側に配設し、また、ズ−ム用モ−タ２６は前側に、フォ−カス用モ−タ３３は後側に各々配設してある。
前述の図１等の実施形態と異なり、このようにズ−ム用モ−タ２６とフォ−カス用モ−タ３３とを前側と後側に分けて配設することにより、２つのモ−タを重ねて配置するものと比べより薄型化が図られる。
また、２つのモ−タ間の電磁的干渉も防ぐことができる。
【００６６】
また、ズ−ム用カム２５については図２０に示すように、２つの筒状基体３５１、３５２からカム基体２５１が構成してある。
具体的には、筒状基体３５１の挿入杆部３５１ａを筒状基体３５２内に挿入し、筒状基体３５２の孔部３５２ａから差し入れた偏心ピン７４を挿入杆部３５１ａのピン孔３５１ｂに嵌着してこれら筒状基体３５１、３５２を一体的に連結する。
【００６７】
すなわち、偏心ピン７４を回動させて挿入杆部３５１ａの挿入深さを調整して筒状基体３５１に形成した一側カム面４０ａと筒状基体３５２に形成した一側カム面４１ａとの間の距離を微調整する。
なお、一側カム面４０ａ、４１ａがカム枠２５２、２５３の他側カム面４０ｂ、４１ｂとで第１、第２カム溝４０、４１を形成することは既に述べたところである。
【００６８】
一方、このズ−ム用カム２５のカム枠２５２には、ピン受片部２５２ｅが内部に向かって突出形成してあり、このピン受片部２５２ｅが筒状基体３５１の長孔３５１ｃ内を摺動するようにしてある。
そして、このピン受片部２５２ｅをカム押動ピン９４によって押動してカム枠２５２、２５３とカム基体２５１を一方向に押動する。
【００６９】
図１７に示してあるように、カム押動ピン９４は前固定枠２７の孔部２７ｃより挿入し、その先端をピン受片部２５２ｅに当接させ、また、このカム押動ピン９４は上記の孔部２７ｃに内装させたカムスプリング９５によって押動勢力が与えてある。
なお、カム押動ピン９４とカムスプリング９５は発光部８１から張出させた板部によって抜け止めするようにしてある。
【００７０】
上記したズ−ム用カム２５において、カム枠２５３はその内部に設けたキ−凸部を筒状基体３５２のキ−溝３５２ｂに嵌合させることで筒状基体３５２と一体回転するようにしてある。
また、このカム枠２５３には連動歯車７５を設け、この連動歯車７５を減速装置４４を介してモ−タ駆動する。
【００７１】
このズ−ミング駆動機構９０の減速装置４４は図２１に示すように、前歯車群と後歯車群とで構成してある。
前歯車群は、ズ−ム用モ−タ２６のピニオン４４ａに大径歯車部を噛合させた歯車４４ｂと、この歯車４４ｂの小径歯車部を噛合させた歯車４４ｃとから構成してある。
なお、歯車４４ｃは回転軸杆４４ｄの前端に設けてあり、この回転杆４４ｄを介して後歯車群を連動する。
【００７２】
後歯車群は、回転軸杆４４ｄの後端に設けた歯車４４ｅと、この歯車４４ｅに大径歯車部を噛合させた歯車４４ｆと、この歯車４４ｆの小径歯車部に大径歯車部を噛合させた歯車４４ｇとから構成してあり、歯車４４ｇの小径歯車部にカム枠２５３の連動歯車７５が噛合している。
【００７３】
このように前歯車群と後歯車群とに分けることによって減速歯車の配置部所が２分されるため、撮影レンズ径に合せた減速装置４４となり、光学系収納部６１の薄型化に適するようになる。
より詳しく説明すると、減速歯車を一ケ所にまとめて配置しようといる充分な減速比を確保するには、ズ−ム機構のズ−ム方向に減速歯車群を延在して配置しなければならず、ズ−ム機構が長くなり、小型化をはばむことになる。
また、長さを変えずに充分な減速比を確保するには、歯車を大径化しなければならず撮影レンズ径に合せた減速装置を実現できず薄型化を阻止してしまう。
【００７４】
図２２は撮像ユニット９６の分解斜視図である。
この撮像ユニット９６は、ホルダ−９７、マスク９８、フィルタ−（ＬＰＦ）９９、ラバ−１００、ＣＣＤ１０１、プレ−ト１０２、配線基板１０３とから構成してある。
具体的には、ホルダ−９７とプレ−ト１０２の間にマスク９８、フィルタ−９９、ラバ−１００、ＣＣＤ１０１を挟むようにしてホルダ−９７をプレ−ト１０２に小ねじ１０４によってねじ止めして一体的なユニット構成とし、その後、ＣＣＤ１０１を配線基板１０３に電気接続してこの配線基板１０３を取付ける。
【００７５】
このように構成した撮像ユニット９６は、図２３、図２４に示してあるように、ズ−ミング駆動機構９０の後固定枠２８に取付ける。
具体的には、後固定枠２８には基準面２８ｂと係止突部２８ｃとが設けてあり、また、この後固定枠２８には撮像ユニット９６を挟持する板ばね１０５、１０６が取付けてある。
【００７６】
したがって、プレ−ト１０２の両側張出片部を基準面２８ｂと板ばね１０５、１０６との間に差し入れると、プレ−ト１０２の取付孔１０２ａに一方の係止突部２８ｃが突入し、プレ−ト１０２の取付け溝１０２ｂに他方の係止突部２８ｃが係合し、また、２つの板ばね１０５、１０６の弾性挟持力によって撮像ユニット９６が取付けられる。
【００７７】
なお、図２３、図２４は説明の便宜上、配線基板１０３を取り外した状態を示しているが、実際には図２５に示したように撮像ユニット９６が取付けられる。
【００７８】
以上、本発明の好ましい実施形態について説明したが、本発明の光学ズ−ム機構はカメラにかぎらずその他の光学機器に実施することができる他、カム基体２５１と一方のカム枠２５２（または２５３）とで構成したカム体についても実施することができる。
この場合、カム基体２５１或いはカム枠２５２に歯車を設け、この歯車を第１の減速歯車群に噛合させるようにする。
また、その他の実施形態としては、図４に示したズ−ム用カム２５に設けた内歯車４２に第１の減速歯車群を噛合させるように構成としも同様に実施することができる。
【００７９】
また、撮影レンズのズ−ミング駆動機構のズ−ム用カムとズ−ム用モ−タ２６の連動系に備えた減速装置４４について説明したが、フアインダ−やフラッシュ装置の変倍用レンズをズ−ミングするズ−ム用カムの減速装置やズ−ミングするリ−ドスクリュとしても同様に実施することができる。
【００８０】
【発明の効果】
上記した通り、本発明に係る光学ズ−ム機構及びカメラは、多くの減速歯車を第１の減速歯車群と第２の減速歯車群に分け、第１、第２の各々の減速歯車群を別々に組込む構成とし、円筒形のカム体、回転軸、モ−タの回転軸の回転軸心方向を光軸方向として配設し、かつ円筒形のカム体の長さと配設位置を規定したことから、狭いスペ−スに組込むことができる光学ズ−ム機構となる。
【００８１】
また、第１の減速歯車群と第２の減速歯車群の２つの歯車構成としたことから、歯車配置の自由度も生ずるようになる。
この結果、カメラの小型化や薄型化が図れる。
【図面の簡単な説明】
【図１】カム装置をズ−ム用カムとして備える電子カメラのズ−ミング駆動機構の第１実施形態を示す斜視図である。
【図２】上記ズ−ミング駆動機構の正面図である。
【図３】ズ−ム用カムの構成部を示した図１同様のズ−ミング駆動機構の斜視図である。
【図４】ズ−ム用カムの斜視図である。
【図５】ズ−ム用カムの分解斜視図である。
【図６】図２上のＡ−Ａ線断面図である。
【図７】カム装置をズ−ム用カムとして備える電子カメラのズ−ミング駆動機構の第２実施形態を示す断面図である。
【図８】カム溝とカムピンの構成部を示す拡大部分断面図である。
【図９】（Ａ）、（Ｂ）、（Ｃ）は他の実施形態を示す図８同様の拡大部分断面図である。
【図１０】ズ−ム用カムの軸受部に生ずる機械的遊びを吸収するコイルばねを設けた実施形態を示す図７同様の断面図である。
【図１１】一つのコイルばねによってカムピンの圧接力を得る一方、ズ−ム用カムの軸受部に生ずる機械的遊びを防ぐようにした実施形態を示す図７同様の断面図である。
【図１２】上記したズ−ミング駆動機構を備える電子カメラの一例として示したカメラ平面図である。
【図１３】図１２に示す電子カメラのカメラ正面図である。
【図１４】図１２に示す電子カメラのカメラ背面図である。
【図１５】図１２に示す電子カメラの撮影状態の一例を示すカメラ正面図ある。
【図１６】図１２に示す電子カメラの光学系吸収部をリアケ−スを取外して示した斜視図である。
【図１７】上記した光学系吸収部の横断面図である。
【図１８】上記した光学系吸収部の分解斜視図である。
【図１９】上記した光学系吸収部に備えたズ−ミング駆動機構を示す斜視図である。
【図２０】図１９に示したズ−ミング駆動機構に備えたズ−ム用カムを示す分解斜視図である。
【図２１】図１９に示したズ−ミング駆動機構に備えた減速装置を示す斜視図である。
【図２２】図１９に示したズ−ミング駆動機構に備えた撮像ユニットを示す分解斜視図である。
【図２３】撮像ユニットと、撮像ユニットの組付け構成を示す光学系収納部の斜視図である。
【図２４】撮像ユニットを組込んだ状態を示す光学系収納部の斜視図である。
【図２５】撮像ユニットが配線基板と共に実際に組付けられた状態を示す光学系収納部の斜視図である。
【符号の説明】
２０ズ−ミング駆動機構
２１第１レンズ群
２１ｃカムピン
２２第２レンズ群
２２ｃカムピン
２３ガイド軸
２５ズ−ム用カム
２６ズ−ム用モ−タ
３０ＣＣＤ
３１第３レンズ群
３３フォ−カス用モ−タ
３５シャッタユニット
４０第１カム溝
４０ａ一側カム面
４０ｂ他側カム面
４１第２カム溝
４１ａ一側カム面
４１ｂ他側カム面
４４減速装置
４４ａピニオン
４４ｂ、４４ｃ歯車
４４ｄ回転軸杆
４４ｅ、４４ｆ、４４ｇ歯車
７４偏心ピン
９４カム押動ピン
９５カムスプリング
２５１カム基体
２５１ａ胴部
２５１ｂ摺動部
２５１ｃ摺動部
２５２カム枠
２５３カム枠
２５４コイルばね
３５１筒状基体
３５１ａ挿入杆部
３５１ｂピン孔
３５２筒状基体
３５２ａ孔部[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical zoom mechanism and a camera having a speed reducer provided in an interlocking system of a power mechanism such as a cam or a lead screw for moving the optical system by zooming and a motor driving the power mechanism .
[0002]
[Prior art]
Many recent cameras include a finder or a flash device having a zooming function in addition to zooming of the taking lens.
In zooming, the zoom lens is moved by a power mechanism including a motor-driven cam and a lead screw.
[0003]
As an example, the zooming configuration of the photographic lens will be described. A cylindrical zoom cam is disposed in the lateral position of the photographic lens to be moved by moving in the optical axis direction. The cam pin of the photographic lens is inserted into the cam groove so as to be interlocked.
[0004]
Further, a zoom motor is arranged on the front side or the rear side of the zoom cam, and a speed reducer is arranged between the motor and the zoom cam. The output is decelerated by a speed reducer and transmitted to the zoom cam, and the zoom cam is rotationally driven.
[0005]
The reduction gear includes a number of reduction gears in addition to the first-stage reduction gear meshed with the motor pinion, and the final-stage reduction gear is meshed with a gear provided in the zoom cam.
[0006]
[Patent Document 1]
JP 2001-133675 A
[Problems to be solved by the invention]
The above reduction gear has a gear configuration in which a large number of reduction gears are centrally provided in an interlocking system between a power mechanism such as a cam or a lead screw and a motor, so that the camera form becomes smaller and thinner. Limitations on the arrangement and built-in space of the speed reducer occur, and the gear configuration becomes complicated.
[0008]
In addition, when a large number of reduction gears are arranged in a concentrated manner, the reduction gear inevitably becomes large. Therefore, especially when the camera configuration is thinned, the space for incorporating the reduction gear becomes a problem, and the thin design of the camera is limited. There is a problem to say.
[0009]
In view of the above circumstances, an object of the present invention is to propose an optical zoom mechanism and a camera provided with this kind of reduction gear so that a small camera and a thin camera can be sufficiently incorporated.
[0010]
[Means for Solving the Problems]
To achieve the above object, according to the present invention, as a first invention, the zoom lens is moved by inserting the cam groove insertion member of the lens holding frame into the cam groove of the motor-driven cam body and moving the zoom lens. In the optical zoom mechanism, the rotary shaft rod provided with gears at both ends, the first reduction gear group engaged with the gear provided on one end side of the rotary shaft rod, and the other end of the rotary shaft rod A second reduction gear group meshing with a gear provided on the side, a motor for driving the second reduction gear group, and a cylindrical cam body driven by the first reduction gear group are provided. The cylindrical cam body and the rotary shaft 配設 are arranged in parallel to the lateral side of the zoom lens, and the cylindrical cam body, the rotary shaft 杆, and the rotation shaft of the motor. distribution to set the rotation axis direction as an optical axis direction of the zoom lens, further, in the optical axis direction of the zoom lens The cam body is shorter than the length from the non-meshing end of the motor with the second reduction gear group to one end of the rotary shaft rod, and the cam body is connected to the first reduction gear group of the cam body. An optical zoom mechanism is proposed in which the meshing end is arranged so as to be closer to the motor side than one end of the rotary shaft rod .
[0011]
A second invention is an optical diagram of a first invention described above - sliding in arm mechanism, wherein the cam member includes a one of the cam frame forming the one side cam surface of the cam groove, as non-rotating with the cam frame provided freely, the composed and the other of the cam frame forming the other side cam surface which face one side cam surface, the cam groove insert member with the cam surface to press one of the cam frame and / or the other of the cam frame abutted example Bei the biasing means to optical's - to propose a beam mechanism.
[0012]
According to a third aspect of the present invention, in the optical zoom mechanism according to the first aspect of the present invention, the cam body includes a spiral first cam groove, a spiral second cam groove, and both side portions of the cylindrical body. The provided small-diameter sliding portion, the one-side cam surface of the first cam groove provided at the step portion between the one-side sliding portion and the cylindrical body, the other sliding portion and the column Forming a cam base having a second cam groove one side cam surface provided in a step portion between the body body and the body, and another side cam surface facing the one cam surface of the first cam groove; A first cam frame that is slidably provided as one non-rotating portion on one sliding portion and an other cam surface that faces the one cam surface of the second cam groove are formed, and the other sliding portion is non-rotating. The second cam frame is slidably provided as a rotation. The second cam frame presses the first cam frame and the second cam frame, and is formed by the first cam frame, the second cam frame, and the cam base. Before inserting into the two cam grooves Cam groove insert an optical's painting Bei biasing means to abut the cam surface - Suggest arm mechanism.
[0013]
A fourth invention is an optical diagram of a first invention described above - in the arm mechanism, wherein the cam member includes a helical first cam groove, the spiral of the second cam groove, on one end side of the cylindrical body One base portion having a small-diameter sliding portion provided, and a one-side cam surface of a first cam groove that is a step provided between the sliding portion and the cylindrical body, and a cylinder The other having a small-diameter sliding portion provided on the other end side of the body and a one-side cam surface of the second cam groove which is a step portion provided between the sliding portion and the cylindrical portion of the cylindrical body of the base portion, and a cam base configured by connecting the the one of the base portion and the other of the base portion, the first form other side cam surface which face one side cam surface of the cam groove, the one A first cam frame that is slidably provided as a non-rotating portion in the sliding portion and an other cam surface that is opposed to the one cam surface of the second cam groove are formed, and the other sliding portion is not rotated. A second cover slidably provided The cam groove that comprises a frame, presses the first cam frame and the second cam frame, and is inserted into two cam grooves formed by the first cam frame, the second cam frame, and the cam base. An optical zoom mechanism having an urging means for bringing the insertion member into contact with the cam surface is proposed.
[0014]
According to a fifth aspect of the present invention, zooming of a picked-up image focused on an image pickup device is performed by inserting a cam groove inserting member of a lens holding frame into a cam groove of a cam body for motor driving and moving a zoom lens. In a camera provided with an optical zoom mechanism to be performed, a rotary shaft rod provided with gears at both ends, a first reduction gear group meshed with a gear provided at one end of the rotary shaft rod, and the rotary shaft rod A second reduction gear group that meshes with a gear provided on the other end of the motor, a motor that drives the second reduction gear group, and a cylindrical cam body that is driven by the first reduction gear group The cylindrical cam body and the rotary shaft 杆 are disposed in parallel to the side of the zoom lens, and the cylindrical cam body, the rotary shaft 杆, and the motor are rotated. and disposed the rotation axis direction of the axis as the optical axis direction of the zoom lens, further the zoom lens In the optical axis direction, the cam body is made shorter than the length from the non-meshing end of the motor with the second reduction gear group to one end of the rotary shaft rod, and the first reduction gear of the cam body Proposed is a camera equipped with an optical zoom mechanism, characterized in that the meshing end with the group is arranged so as to be closer to the motor side than one end of the rotary shaft rod .
[0015]
A sixth invention is the camera of the fifth invention described above, the cam body, and one of the cam frame forming the one side cam surface of the cam groove slidably provided as non-rotating with the cam frame, The other cam frame formed with the other side cam surface opposed to the one side cam surface,
By pressing one of the cam frame and / or the other of the cam frame proposes a camera example Bei biasing means to abut the cam groove insert member with the cam surface.
[0016]
According to a seventh aspect of the present invention, in the camera according to the fifth aspect, the cam body includes a spiral first cam groove, a spiral second cam groove, and a small diameter provided on each side of the cylindrical body. -Shaped sliding portion, one side cam surface of the first cam groove provided in the step portion between the sliding portion on one side and the cylindrical body portion, the other sliding portion and the cylindrical body portion a cam base having a first side cam surface of the second cam groove provided on the step portion, the other side cam surface which face one side cam surface of the first cam groove formed between the, one slide a first cam frame having slidably a non-rotating separate component, the second form other side cam surface which face one side cam surface of the cam groove, sliding as a non-rotating to the other slide portion A second cam frame that is freely provided, presses the first cam frame and the second cam frame, and is formed of two lines formed by the first cam frame, the second cam frame, and the cam base. The cam groove to be inserted into the cam groove The input member is proposed a camera example Bei biasing means to abut the cam surface.
[0017]
An eighth invention is the camera of the fifth invention described above, the cam member includes a helical first cam groove, the spiral of the second cam groove, a small diameter provided on one end side of the cylindrical body One base portion having a cylindrical sliding portion, a one-side cam surface of a first cam groove that is a step portion provided between the sliding portion and the cylindrical body, and the other end of the cylindrical body A second base portion having a small-diameter sliding portion provided on the side, and a one-side cam surface of a second cam groove that is a step portion provided between the sliding portion and the barrel portion of the cylindrical body; A cam base formed by connecting the one base part and the other base part and an other side cam face to be opposed to the one side cam face of the first cam groove. A first cam frame that is slidably provided as a non-rotating part in the moving part and an other side cam face that faces the one side cam face of the second cam groove are formed , and a non-rotating part is formed on the sliding part of the other base part. Slidably provided as rotation The first cam frame and the second cam frame are pressed and inserted into two cam grooves formed by the first cam frame, the second cam frame, and the cam base. A camera having a biasing means for bringing the cam groove insertion member into contact with the cam surface is proposed.
[0018]
According to a ninth invention, in the camera of the fifth invention described above, a focusing lens that moves and focuses by motor driving is provided, and the focusing motor is moved to the first deceleration. The zooming motor is disposed in the vicinity of the gear group in the vicinity of the second reduction gear group , and the direction of the rotation axis of the focus motor is changed. We propose a camera equipped with an optical zoom mechanism characterized in that it is arranged in the direction of the optical axis of the double lens.
[0019]
In the above optical zoom mechanism and camera, when the motor is started, first, the first reduction gear group is rotationally driven, and this rotational driving force is transmitted to the rotational shaft rod. The interlocking second reduction gear group receives the rotational driving force.
Therefore, the power mechanism rotates in conjunction with the second reduction gear group, and moves the optical system by zooming.
In the optical zoom mechanism and camera configured as described above, the first and second reduction gear groups are divided into two gear groups, so that the gear structure of each of the first and second reduction gear groups is such become larger rather, Moreover, since the axial direction, such as the cam member and the rotary shaft rod of the cylinder is disposed as an optical axis direction, each of the built-in space - Ki out to narrow the scan, small-type, A thin camera can be sufficiently incorporated.
Further, since a large number of gears are divided into the first and second reduction gear groups, the gear configuration is not complicated, and there is a degree of freedom in gear arrangement.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Next, a first embodiment in which the present invention is implemented in an electronic camera will be described with reference to the drawings.
FIG. 1 is a perspective view showing a zooming drive mechanism 20 of the photographing lens, and FIG. 2 is a front view of the zooming drive mechanism 20.
[0021]
In these drawings, 21 indicates a first lens group, 22 indicates a second lens group, and the first and second lens groups 21 and 22 are provided on a boss 21b provided on the lens frame 21a and on the lens frame 22a. The guide shaft 23 is slidably inserted into the boss 22b, and the first and second lens groups 21 and 22 are supported by the guide shaft 23.
[0022]
Also, holes (not shown) are provided at the positions of the lens frames 21a and 22a opposite to the bosses 21b and 22b, and a sliding rod 24 is slidably inserted into these holes, so that the first, The second lens groups 21 and 22 are configured to prevent rotation.
[0023]
Further, the cam pin (cam groove insertion member) 21c of the first lens group 21 formed to protrude from the boss 21b and the cam pin (cam groove insertion member) 22c of the second lens group 22 formed to protrude from the boss 22b are zoomed. The first and second lens groups 21 and 22 are inserted into the cam groove of the cam 25 for cam feeding in the optical axis direction according to the rotation of the zoom cam 25. (See Figure 3)
The zoom cam 25 is rotationally driven by a zoom motor 26.
[0024]
One end side of the guide shaft 23 and the sliding rod 24 is fixed to the front fixed frame 27, and the other end side is fixed to the rear fixed frame 28. The zoom cam 25 is a bearing portion 27a of the front fixed frame 27. And a bearing portion 29a (see FIG. 6) of a support fixing frame 29 fixed to the rear fixing frame 28, so as to be freely rotatable.
[0025]
The front fixing frame 27 and the rear fixing frame 28 are provided with window holes 27b and 28a through which subject image light passes, and a CCD (solid-state imaging device) 30 is assembled immediately after the window hole of the rear fixing frame 28. It is crowded. (See Figs. 1 and 3)
[0026]
On the other hand, the third lens group 31 shown in FIG. 1 is a focus lens. A guide shaft 23 is inserted into a boss 31b provided on the lens frame 31a to support the third lens group 31.
The third lens group 31 is advanced and retracted in the optical axis direction by a nut screw 32 provided in a part of the lens frame 31a being screwed by a lead screw 34 that is rotationally driven by a focus motor 33. Moving.
[0027]
1 is a shutter unit attached to the lens frame 22a, 36 is a cover plate, 37 is a zoom photointerrupter attached to the cover plate, 38 is a focus photointerrupter, 39 Is a spring for preventing backlash of the third lens group 31, and absorbs backlash such as the lead screw 34 and the nut 32 by urging the boss 31b in one direction.
The zoom photo interrupter 37 detects the initial zoom position, and the focus photo interrupter 38 detects the initial focus position.
[0028]
The zoom lens driving mechanism 20 configured as described above is configured so that the zoom lens 25 is driven by the zoom motor 26 so that the first and second lens groups 21 and 22 are rotated. The zooming is performed by moving along the guide shaft 23, and the nut screw 32 is screwed by rotating the lead screw 34 by the focus motor 33, so that the third lens group is driven. 31 moves to perform focusing.
The third lens group 31 is also moved during zooming.
[0029]
On the other hand, a zoom cam 25 provided as a cam device in the above-described zooming drive mechanism 20 will be described with reference to FIG. 3, FIG. 4, and FIG.
3 is a perspective view of the zooming drive mechanism 20 similar to that of FIG. 1 with the third lens group 31, the focus motor 33, the shutter unit 35, the cover plate 36, etc. removed, and FIG. FIG. 5 is a perspective view of the zoom cam 25, and FIG. 5 is an exploded perspective view of the zoom cam.
[0030]
As shown in the figure, the zoom cam 25 is a cylindrical cam having a first cam groove 40 and a second cam groove 41, and is slidable on both sides of the cylindrical cam base 251 and the cam base 251. Cylindrical cam frames 252 and 253 to be fitted, and a coil spring 254 having a tensile force that presses these cam frames 252 and 253 in the approaching direction.
[0031]
The cam base 251 is provided with sliding portions 251b and 251c each having a small diameter on both sides of the body portion 251a, and a step portion between the body portion 251a and the sliding portion 251b forms the first cam groove 40. The one side cam surface 40 a is formed, and the step portion between the body portion 251 a and the sliding portion 251 c is formed as the one side cam surface 41 a for forming the second cam groove 41.
[0032]
Further, the cam base 251 is provided with elongated holes 251d and 251e formed along the cylinder axis direction from both side ends, and the protruding pieces 252a and 253a of the cam frames 252 and 253 are provided in these elongated holes 251d and 251e. The cam frames 252 and 253 are rotated together with the cam base 251 so as to be slidably fitted.
The hole 251f formed in the body 251a of the cam base 251 is for attaching the coil spring 254, and the stepped portions 251g and 251h formed at the ends of the sliding portions 251b and 251c are cam frames. The movement of 252 and 253 is restricted.
[0033]
On the other hand, the cam frame 252 has a circumferential portion at one end as the other cam surface 40b of the first cam groove 40, and an inward flange 252b is formed at the other end.
Further, the cam frame 252 is provided with a spring hooking portion 252c that protrudes into the cylinder from the protruding piece portion 252a.
[0034]
The cam frame 253 is formed with a circumferential portion at one end as the other cam surface 41b of the second cam groove 41, and an inward flange 253b is formed at the other end.
Further, the cam frame 253 is provided with a spring hooking portion 253c that protrudes from the protruding piece portion 253a into the cylinder.
[0035]
The cam base 251 and the cam frames 252 and 253 formed as described above are configured so that the cam frame 252 is fitted to the sliding portion 251b of the cam base 251 and the cam frame 253 is fitted to the sliding portion 251c. One end of the spring 254 is locked to the spring hooking portion 252c of the cam frame 252, and the other end is locked to the spring hooking portion 253c of the cam frame 253.
[0036]
Since the coil spring 254 presses the cam frames 252 and 253 in the approaching direction, the cam frame 252 slides on the sliding portion 251b and advances until the flange portion 252b hits the stepped portion 251g of the cam base 251. Thus, the first cam groove 40 is formed by the one side cam surface 40a and the other side cam surface 40b.
[0037]
Similarly, the cam frame 253 slides on the sliding portion 251c, and the flange portion 253b hits the stepped portion 251h. In this state, the second cam groove 41 is formed by the one side cam surface 41a and the other side cam surface 41b. Is done.
The cam grooves 40 and 41 formed in this way can be formed as spiral cam grooves that match the movement of the first and second lens groups 21 and 22 necessary for zooming.
[0038]
As shown in FIG. 3, the zoom cam 25 configured as described above has the cam pin 21c of the first lens group 21 inserted (entered) into the first cam groove 40 and the second cam groove 41 into the second cam groove 41. The cam pins 22c of the lens group 22 are inserted (entered).
Thus, when the cam pins 21c and 22c are inserted, the flange portion 252b of the cam frame 252 is slightly retracted from the stepped portion 251g, and similarly, the flange portion 253b of the cam frame 253 is also slightly retracted from the stepped portion 251h. .
[0039]
Therefore, since the cam pin 21c is pressed against the cam surface 40b of the cam frame 252 and the cam pin 22c is pressed by the cam surface 41b of the cam frame 253, the cam pins 21c and 22c are kept at a constant pressure contact force throughout the cam grooves 40 and 41. Will come into contact with the cam surface.
[0040]
Further, the pressure contact force of the cam pins 21c and 22c with respect to the cam surface can be determined by the tensile force of the coil spring 254. Therefore, if the coil spring 254 having an appropriate tensile force is selected, the cam pins 21c and 22c are set to the optimum pressure force. can do.
[0041]
Therefore, the zoom cam 25 can be rotated with a constant motor driving force, and the movement of the first and second lens groups 21 and 22 can be performed smoothly.
As a result, the zoom cam 25 becomes a light load cam device with little fluctuation, so that a small motor with low power consumption can be used as the zoom motor 26.
[0042]
FIG. 6 is a cross-sectional view of the zoom cam 25 taken along the line AA in FIG. 2 and its drive system.
As shown in the drawing, an internal gear 42 is provided on the rear end side of the zoom cam 25, and the protruding portion 42a of the internal gear 42 enters the inner hole of the cam base 251. A key 42 b provided in the peripheral portion is fitted in a key groove 251 i formed in the inner hole portion of the cam base 251.
As a result, the zoom cam 25 rotates integrally with the internal gear 42.
[0043]
The internal gear 42 is rotatably supported by a bearing portion 29 a provided on the support fixing frame 29, and an interlocking small gear 43 is engaged with the internal gear 42.
The interlocking small gear 43 is rotationally driven by the zoom motor 26 via the speed reducer 44, and rotates the internal gear 42 to rotate the zoom cam 25.
[0044]
The zoom driving mechanism 20 of the photographic lens implemented as described above is such that the cam pins 21c and 22c become the zoom cam 25 in which the constant pressure contact force is exerted over the entire area of the first and second cam grooves 40 and 41. In addition, since the zoom motor 26 is disposed on the same core as the zoom cam 25, the lateral width of the camera (the lateral width in FIG. 2) can be shortened. Further, since the first and second lens groups 21 and 22 for zooming and the third lens group 31 for focusing are supported by the same guide shaft 23 and moved, the decentering of the lens group, It will be hard to fall over.
[0045]
FIG. 7 shows the zooming drive mechanism 50 shown as the second embodiment.
This zooming drive mechanism 50 is characterized in that the other-side cam surfaces 40b and 41b formed on the cam frames 252 and 253 are inclined at a predetermined angle, and the others are shown in FIGS. It has the same configuration as the zooming drive mechanism 20.
7 corresponds to a cross-sectional view taken along line BB in FIG.
FIG. 8 is an enlarged cross-sectional view showing the components of the first and second cam grooves 40 and 41 and the cam pins 21c and 22c. As can be seen from this figure, in addition to the first and second cam frames 252 and 253, FIG. The side cam surfaces 40b and 41b are formed as inclined cam surfaces having an upward gradient toward the outer peripheral surface of the frame.
[0046]
The cam pins 21c and 22c receive the pushing force in the direction F1 shown in the figure by making the other-side cam surfaces 40b and 41b inclined as described above.
That is, since the spring force in the direction F2 shown in the figure is applied to the first and second cam frames 252 and 253 by the coil spring 254, the cam pins 21c and 22c pushed by the inclined surfaces of the other cam surfaces 40b and 41b are provided. In addition to the force that presses against the one side cam surfaces 40a and 41a, a pressing force F1 that is in a direction orthogonal to the rotation axis of the cam groove is received.
[0047]
The pressing force F1 acting on the cam pins 21c and 22c works so that the hole surface portions of the support shaft holes 21d and 22d (see FIG. 8) of the bosses 21b and 22b abut on the guide shaft 23, thereby supporting the support shaft holes. Mechanical play between 21d and 22d and the guide shaft 23 is absorbed.
[0048]
In the zoom cam 25 configured as described above, the cam pins 21c and 22c abut against the entire area of the first and second cam grooves 40 and 41 with a constant pressing force, and the cam pins 21c and 22c are used for zoom. According to the rotation of the cam 25, the first and second lens groups 21 and 22 are moved along the guide shaft 23 by being driven to move in the rotation axis direction of the cam groove (left and right direction in FIGS. 7 and 8).
[0049]
Further, as described above, since the bosses 21b and 22b slide on the guide shaft 23 without mechanical play, the first and second lens groups 21 and 22 are not inclined or decentered.
As a result, a zooming drive mechanism including a zooming cam 25 (cam device) that can increase zooming accuracy is provided.
[0050]
9A, 9B, and 9C are cross-sectional views similar to FIG. 8 showing another embodiment in which the cam surface inclination positions of the first and second cam grooves 40 and 41 are changed.
FIG. 9A shows an embodiment in which the one-side cam surfaces 40a and 41a of the first and second cam grooves 40 and 41 are inclined, and FIG. 9B shows the first and second cam grooves 40 and 41. In the embodiment in which both cam surfaces of the one side cam surfaces 40a and 41a and the other side cam surfaces 40b and 41b are inclined, FIG. 9C shows the other side cam surfaces 40b of the first and second cam grooves 40 and 41. , 41b and cam pins 21c, 22c are inclined.
[0051]
Even with this configuration, since the pushing force F1 acts on the cam pins 21c and 22c, the mechanical play between the bosses 21b and 22b and the guide shaft 23 can be absorbed as in the embodiment shown in FIG. The inclination and decentering of the first and second lens groups 21 and 22 can be prevented.
Further, by forming both cam surfaces to be inclined as in the configuration shown in FIG. 9B, it is possible to realize a smoother zoom mechanism operation than that in which one cam surface is inclined. it can.
In the embodiment shown in FIGS. 8, 9A, and 9B, the contact portions of the cam pins 21c and 22c that contact the cam surface may be inclined.
[0052]
FIG. 10 shows an embodiment in which a coil spring 45 is provided on the bearing portion 27a of the front fixed frame 27 in order to absorb the bearing backlash of the zoom cam 25 in the zooming drive mechanism 50 described above.
The coil spring 45 presses the zoom cam 25 in one direction to prevent the zoom cam 25 from acting in the rotation axis direction, and the movement position accuracy of the first and second lens groups 21 and 22 is improved. It is something to enhance.
[0053]
In FIG. 11, a single coil spring 46 is provided in the bearing portion 27a of the front fixed frame 27, the first and second cam frames 252 and 253 are pressed by the coil spring 46, and the bearing backlash of the zoom cam 25 is shown. Embodiment which absorbs is shown.
[0054]
In this embodiment, the first cam frame 252 is pressed, the cam base 251 is pressed via the cam pin 21c, and the second cam frame 253 is pressed in one direction via the cam pin 22c. is there.
With this configuration, the coil spring 254 suspended from the first and second cam frames 252 and 253 is not necessary.
[0055]
FIGS. 12 to 14 show an example of an electronic camera (digital camera) that does not have a lens barrel and does not have a lens barrel, which is the same as the zoom driving mechanisms 20 and 50 described above.
12 is a plan view of the camera, FIG. 13 is a front view of the camera, and FIG. 14 is a rear view of the camera.
[0056]
As shown in the figure, this electronic camera has a thin camera form in which the width and length are wide and the depth is narrow as viewed from the front.
In addition, this electronic camera includes a camera body 60 having a controller, a memory card, a calculation unit, a memory card storage unit, and the like, and an optical system storage unit 61 having a photographing lens and the like in a separate box shape. It is configured as a body.
The camera body 60 and the optical system storage 61 are connected by a connecting part 62 so that they can be rotated with an appropriate degree of moderation.
[0057]
As shown in the figure, a shutter button 63 and a power switch 64 are provided on the upper surface of the camera body 60, and a liquid crystal monitor 65, a selection / determination button 66, and a zoom button are provided on the back of the camera body 60. 67, a mode selection button 68, and the like are provided. Further, in the camera body 60 (not shown), various circuit boards including a CPU, a battery for supplying power, and a memory card storage unit are stored. .
Furthermore, a photographing lens window 69 and a flash unit light emission window 70 are provided on the upper surface of the optical system storage unit 61, and a zooming mechanism unit 20, 50, 90 and a flash unit 80 to be described later are provided therein. It is stored in the dark.
As described above, the display unit, the operation unit, the battery, the memory card storage unit, and the circuit board are collectively arranged in the camera body unit 60, and the optical mechanism and the flash unit 80 are arranged in the optical system storage unit 61. By concentrating and arranging the cameras, the overall thickness of the camera is reduced.
[0058]
The above-described electronic camera is convenient to carry because it is in the form of a very thin camera.
On the other hand, when taking an image, as shown in FIG. 15 as an example, the optical system housing 61 is rotated so that the taking lens window 69 faces the front.
In this state, the camera main body 60 can be grasped with a hand and the shutter can be released, so that the camera has very little camera shake.
In addition, the optical system housing 61 can be rotated to the opposite side of FIG. 15 to photograph the same direction as the liquid crystal monitor 65.
[0059]
16 is a perspective view of the optical system storage unit 61 with the rear case (camera case) removed to show the internal configuration, FIG. 17 is a cross-sectional view of the optical system storage unit 61, and FIG. 18 shows the optical system storage unit. 4 is an exploded perspective view of a part 61. FIG.
As can be seen from these drawings, the optical system storage unit 61 includes a flash unit 80 and a zoom driving mechanism (optical system unit) 90 for a photographic lens in a box-shaped front case (camera case) 71. The lens barrel is not provided with no attached lens barrel, and the above units and the like are shielded and stored.
Therefore, the optical system housing part 61 is configured to be able to reduce the thickness of the camera by suppressing the thickness to be regulated by the height dimension of the thin optical system unit.
[0060]
The flash unit 80 is a light emitting unit 81 disposed in the light emitting window 70, the innermost part in the front case 71, and is adjacent to the rear of the optical system unit, and the optical in the front case 71. The wiring board 83 is disposed adjacent to the side of the system unit.
[0061]
Further, the zooming drive mechanism 90 is screwed into the front case 71 with a small screw 91 and is arranged from the photographing lens window 69 to the first, second and third lens groups 21, 22 and 31. The photographic image light enters the imaging optical system.
The zooming drive mechanism 90 is provided with a cover 92 that prevents intrusion of solder scraps and dust.
[0062]
As described above, the rear case 72 is screwed to the front case 71 in which the flash unit 80 and the zooming drive mechanism 90 are assembled.
Specifically, as shown in FIG. 18, one end of the rear case 72 is screwed with a small screw 93 inserted from the front case 71, and the other side of the rear case 72 is one tongue of the connecting portion 62. Screwed with piece 62a.
[0063]
That is, the one tongue piece 62a of the connecting portion 62 is fastened to the front case 71 and the rear case 72 by the machine screw 73, and these cases 71 and 72 are fixed together.
The other tongue piece 62b of the connecting portion 62 is screwed to the case of the camera body portion 60, and is connected to the camera body portion 60 and the optical system storage portion 61 by the tubular portion 62c so as to be rotatable. Electrical wiring between them is performed.
In addition, 94 shown in FIG. 18 is a cam push pin, 95 is a cam spring, and 96 is an image pickup unit, which will be described later.
[0064]
The optical system storage unit 61 configured as described above is not particularly required to be provided with a lens barrel, and can be set to a depth width that matches the lens aperture, so that it is suitable for an extremely thin electronic camera.
[0065]
FIG. 19 is a perspective view of the zooming drive mechanism 90 described above.
The zooming drive mechanism 90 has the same configuration as the zooming drive mechanisms 20 and 50 already described. However, the zooming drive mechanism 90 is provided with the zoom cam 25 as a photographic lens. The zoom motor 26 is disposed on the front side, and the focus motor 33 is disposed on the rear side.
Unlike the above-described embodiment shown in FIG. 1 and the like, the zoom motor 26 and the focus motor 33 are divided into the front side and the rear side in this manner, thereby providing two motors. The thickness can be reduced as compared with the case of stacking the stackers.
Also, electromagnetic interference between the two motors can be prevented.
[0066]
As for the zoom cam 25, as shown in FIG. 20, a cam base 251 is composed of two cylindrical bases 351 and 352.
Specifically, the insertion flange 351a of the cylindrical base 351 is inserted into the cylindrical base 352, and the eccentric pin 74 inserted from the hole 352a of the cylindrical base 352 is fitted into the pin hole 351b of the insertion flange 351a. The cylindrical base bodies 351 and 352 are integrally connected.
[0067]
In other words, the eccentric pin 74 is rotated to adjust the insertion depth of the insertion flange 351a and between the one side cam surface 40a formed on the cylindrical base 351 and the one side cam surface 41a formed on the cylindrical base 352. Fine-tune the distance.
As described above, the first cam surfaces 40a and 41a form the first and second cam grooves 40 and 41 with the other cam surfaces 40b and 41b of the cam frames 252 and 253, respectively.
[0068]
On the other hand, on the cam frame 252 of the zoom cam 25, a pin receiving piece 252e is formed so as to protrude inward, and the pin receiving piece 252e slides in the long hole 351c of the cylindrical base 351. It is supposed to move.
The pin receiving piece 252e is pushed by the cam pushing pin 94 to push the cam frames 252 and 253 and the cam base 251 in one direction.
[0069]
As shown in FIG. 17, the cam push pin 94 is inserted from the hole 27c of the front fixed frame 27, the tip thereof is brought into contact with the pin receiving piece 252e, and the cam push pin 94 is A pushing force is given by a cam spring 95 installed in the hole 27c.
The cam push pin 94 and the cam spring 95 are prevented from coming off by a plate portion protruding from the light emitting portion 81.
[0070]
In the zoom cam 25 described above, the cam frame 253 is configured to rotate integrally with the cylindrical base 352 by fitting a key projection provided therein into a key groove 352b of the cylindrical base 352. is there.
The cam frame 253 is provided with an interlocking gear 75, and the interlocking gear 75 is motor-driven via the reduction gear 44.
[0071]
As shown in FIG. 21, the speed reduction device 44 of the zooming drive mechanism 90 includes a front gear group and a rear gear group.
The front gear group is constituted by a gear 44b in which a large-diameter gear portion is engaged with a pinion 44a of a zoom motor 26, and a gear 44c in which a small-diameter gear portion of the gear 44b is engaged.
The gear 44c is provided at the front end of the rotary shaft 44d, and the rear gear group is linked via the rotary shaft 44d.
[0072]
The rear gear group includes a gear 44e provided at the rear end of the rotary shaft 44d, a gear 44f in which the large-diameter gear portion is engaged with the gear 44e, and a large-diameter gear portion in mesh with the small-diameter gear portion of the gear 44f. The interlocking gear 75 of the cam frame 253 is meshed with the small-diameter gear portion of the gear 44g.
[0073]
By dividing the front gear group and the rear gear group in this way, the arrangement portion of the reduction gear is divided into two, so that the reduction device 44 is adapted to the photographic lens diameter, so that the optical system housing 61 is suitable for thinning. become.
More specifically, in order to secure a sufficient reduction gear ratio where the reduction gears are to be arranged in one place, the reduction gear group must be extended and arranged in the zoom direction of the zoom mechanism. Therefore, the zoom mechanism becomes longer and the miniaturization is expected.
Also, in order to ensure a sufficient reduction ratio without changing the length, the gear must be made large in diameter, and a reduction gear that matches the diameter of the photographic lens cannot be realized, thus preventing a reduction in thickness.
[0074]
FIG. 22 is an exploded perspective view of the imaging unit 96.
The imaging unit 96 includes a holder 97, a mask 98, a filter (LPF) 99, a rubber 100, a CCD 101, a plate 102, and a wiring board 103.
Specifically, the holder 97 is screwed to the plate 102 with a small screw 104 so that the mask 98, the filter 99, the rubber 100, and the CCD 101 are sandwiched between the holder 97 and the plate 102. Then, the CCD 101 is electrically connected to the wiring board 103 and the wiring board 103 is attached.
[0075]
The imaging unit 96 configured as described above is attached to the rear fixed frame 28 of the zooming drive mechanism 90 as shown in FIGS.
Specifically, the rear fixed frame 28 is provided with a reference surface 28b and a locking projection 28c, and leaf springs 105 and 106 for holding the imaging unit 96 are attached to the rear fixed frame 28. .
[0076]
Therefore, when the protruding portions on both sides of the plate 102 are inserted between the reference surface 28b and the leaf springs 105 and 106, one locking projection 28c enters the mounting hole 102a of the plate 102, The other locking projection 28c engages with the mounting groove 102b of the plate 102, and the imaging unit 96 is mounted by the elastic clamping force of the two leaf springs 105 and 106.
[0077]
23 and 24 show the state in which the wiring board 103 is removed for convenience of explanation, the imaging unit 96 is actually attached as shown in FIG.
[0078]
Although the preferred embodiment of the present invention has been described above, the optical zoom mechanism of the present invention can be implemented not only in a camera but also in other optical devices, and in addition to a cam base 251 and one cam frame 252 (or 253). It can also be implemented for the cam body constituted by the above.
In this case, a gear is provided on the cam base 251 or the cam frame 252 so that the gear meshes with the first reduction gear group.
As another embodiment, the first reduction gear group can be meshed with the internal gear 42 provided on the zoom cam 25 shown in FIG.
[0079]
Further, the reduction device 44 provided in the interlocking system of the zoom cam and the zoom motor 26 of the zoom driving mechanism of the photographing lens has been described. The present invention can be similarly applied to a zooming device for a zooming cam for zooming or a lead screw for zooming.
[0080]
【The invention's effect】
As described above, in the optical zoom mechanism and the camera according to the present invention, many reduction gears are divided into a first reduction gear group and a second reduction gear group, and the first and second reduction gear groups are divided. Separately assembled, the cylindrical cam body, the rotating shaft, and the rotational axis of the motor rotating shaft are arranged as the optical axis direction , and the length and position of the cylindrical cam body are defined. Therefore, the optical zoom mechanism can be incorporated in a narrow space.
[0081]
Further, since the two gear configurations of the first reduction gear group and the second reduction gear group are adopted, the degree of freedom of the gear arrangement is also generated.
As a result, the camera can be reduced in size and thickness.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a first embodiment of a zooming drive mechanism of an electronic camera provided with a cam device as a zoom cam.
FIG. 2 is a front view of the zooming drive mechanism.
FIG. 3 is a perspective view of a zooming drive mechanism similar to that in FIG. 1 showing the components of the zoom cam.
FIG. 4 is a perspective view of a zoom cam.
FIG. 5 is an exploded perspective view of a zoom cam.
6 is a cross-sectional view taken along line AA in FIG.
FIG. 7 is a cross-sectional view showing a second embodiment of a zooming drive mechanism of an electronic camera provided with a cam device as a zoom cam.
FIG. 8 is an enlarged partial sectional view showing constituent parts of a cam groove and a cam pin.
9A, 9B, and 9C are enlarged partial sectional views similar to FIG. 8 showing another embodiment.
10 is a cross-sectional view similar to FIG. 7 showing an embodiment provided with a coil spring that absorbs mechanical play generated in the bearing portion of the zoom cam.
11 is a cross-sectional view similar to FIG. 7 showing an embodiment in which a cam pin pressure contact force is obtained by one coil spring while mechanical play occurring in a bearing portion of a zoom cam is prevented.
FIG. 12 is a camera plan view showing an example of an electronic camera including the above-described zooming drive mechanism.
13 is a camera front view of the electronic camera shown in FIG.
14 is a camera rear view of the electronic camera shown in FIG. 12. FIG.
15 is a camera front view showing an example of a shooting state of the electronic camera shown in FIG. 12;
16 is a perspective view showing the optical system absorbing portion of the electronic camera shown in FIG. 12 with the rear case removed. FIG.
FIG. 17 is a cross-sectional view of the above-described optical system absorber.
FIG. 18 is an exploded perspective view of the optical system absorber described above.
FIG. 19 is a perspective view showing a zooming drive mechanism provided in the optical system absorber.
20 is an exploded perspective view showing a zoom cam provided in the zooming drive mechanism shown in FIG. 19;
21 is a perspective view showing a speed reducer provided in the zooming drive mechanism shown in FIG.
22 is an exploded perspective view showing an image pickup unit provided in the zooming drive mechanism shown in FIG.
FIG. 23 is a perspective view of an imaging unit and an optical system storage unit showing an assembly configuration of the imaging unit.
FIG. 24 is a perspective view of the optical system housing portion showing a state in which the imaging unit is assembled.
FIG. 25 is a perspective view of the optical system housing portion showing a state where the imaging unit is actually assembled together with the wiring board.
[Explanation of symbols]
20 Zooming drive mechanism 21 First lens group 21c Cam pin 22 Second lens group 22c Cam pin 23 Guide shaft 25 Zoom cam 26 Zoom motor 30 CCD
31 Third lens group 33 Focus motor 35 Shutter unit 40 First cam groove 40a One side cam surface 40b Other side cam surface 41 Second cam groove 41a One side cam surface 41b Other side cam surface 44 Deceleration device 44a Pinion 44b, 44c Gear 44d Rotating shaft 44e, 44f, 44g Gear 74 Eccentric pin 94 Cam push pin 95 Cam spring 251 Cam base 251a Body 251b Sliding part 251c Sliding part 252 Cam frame 253 Cam frame 254 Coil spring 351 Cylindrical base 351a Insertion flange 351b Pin hole 352 Cylindrical base 352a Hole

Claims

In an optical zoom mechanism in which a cam groove insertion member of a lens holding frame is inserted into a cam groove of a motor body for driving a motor, and a zoom lens is moved to perform zooming.
A rotating shaft rod provided with gears at both ends, a first reduction gear group meshed with a gear provided on one end side of the rotating shaft rod, and a first gear meshed with a gear provided on the other end side of the rotating shaft rod. 2 reduction gear groups, a motor for driving the second reduction gear group, and a cylindrical cam body driven by the first reduction gear group,
The cylindrical cam body and the rotary shaft した are arranged in parallel to the side of the zoom lens, and the cylindrical cam body, the rotary shaft 杆, and the rotation shaft of the motor are rotated. The axial direction is arranged as the optical axis direction of the zoom lens ,
Furthermore, in the optical axis direction of the zoom lens, the cam body is made shorter than the length from the non-meshing end of the motor with the second reduction gear group to one end of the rotary shaft rod, and the cam body An optical zoom mechanism characterized in that the meshing end with the first reduction gear group is disposed so as to be closer to the motor side than one end of the rotary shaft rod .

The optical zoom mechanism according to claim 1,
The cam body is provided with one cam frame forming one side cam surface of a cam groove and the other cam surface slidably provided on the cam frame as non-rotating and opposite to the one side cam surface. Of the cam frame,
An optical zoom mechanism comprising urging means for pressing one cam frame and / or the other cam frame to abut the cam groove insertion member against the cam surface.

The optical zoom mechanism according to claim 1,
The cam body includes a spiral first cam groove, a spiral second cam groove,
A small-diameter sliding portion provided on each side portion of the cylindrical body, a one-side cam surface of the first cam groove provided in a step portion between the sliding portion on one side and the body portion of the cylindrical body, A cam base having a second cam groove one-side cam surface provided in a step between the other sliding portion and the cylindrical body;
A first cam frame that forms an other cam surface facing the one cam surface of the first cam groove and is slidable as a non-rotating one sliding portion, and a one cam of the second cam groove A second cam frame formed on the other sliding surface to be opposed to the surface and slidably provided on the other sliding portion as non-rotating,
The cam surface is inserted into the two cam grooves formed by the first cam frame, the second cam frame, and the cam base by pressing the first cam frame and the second cam frame. Optical zoom mechanism provided with biasing means for abutting against the lens.

The optical zoom mechanism according to claim 1,
The cam body includes a spiral first cam groove, a spiral second cam groove,
One having a small-diameter sliding portion provided on one end side of the cylindrical body, and a one-side cam surface of the first cam groove that is a step provided between the sliding portion and the body portion of the cylindrical body A base portion of
A small-diameter sliding portion provided on the other end side of the cylindrical body, and a one-side cam surface of a second cam groove that is a step provided between the sliding portion and the barrel portion of the cylindrical body. The other base portion,
A cam base configured by connecting the one base portion and the other base portion;
A first cam frame that forms an other cam surface facing the one cam surface of the first cam groove and is slidable as a non-rotating one sliding portion, and a one cam of the second cam groove A second cam frame formed on the other sliding surface to be opposed to the surface and slidably provided on the other sliding portion as non-rotating,
The cam surface is inserted into the two cam grooves formed by the first cam frame, the second cam frame, and the cam base by pressing the first cam frame and the second cam frame. Optical zoom mechanism provided with biasing means for abutting against the lens.

An optical zoom mechanism for zooming a picked-up image focused on an image pickup element by inserting a cam groove inserting member of a lens holding frame into a cam groove of a cam body for motor driving and moving a zoom lens. In a camera equipped with
A rotating shaft rod provided with gears at both ends, a first reduction gear group meshed with a gear provided on one end side of the rotating shaft rod, and a first gear meshed with a gear provided on the other end side of the rotating shaft rod. 2 reduction gear groups, a motor for driving the second reduction gear group, and a cylindrical cam body driven by the first reduction gear group,
The cylindrical cam body and the rotary shaft した are arranged in parallel to the side of the zoom lens, and the cylindrical cam body, the rotary shaft 杆, and the rotation shaft of the motor are rotated. The axial direction is arranged as the optical axis direction of the zoom lens ,
Furthermore, in the optical axis direction of the zoom lens, the cam body is made shorter than the length from the non-meshing end of the motor with the second reduction gear group to one end of the rotary shaft rod, and the cam body A camera provided with an optical zoom mechanism, wherein the engaging end of the first reduction gear group is disposed on the motor side of one end of the rotary shaft .

The camera according to claim 5, wherein
The cam body is provided with one cam frame forming one side cam surface of a cam groove and the other cam surface slidably provided on the cam frame as non-rotating and opposite to the one side cam surface. Of the cam frame,
A camera provided with an urging means that presses one cam frame and / or the other cam frame to bring the cam groove insertion member into contact with the cam surface.

The camera according to claim 5, wherein
The cam body includes a spiral first cam groove, a spiral second cam groove,
A small-diameter sliding portion provided on each side portion of the cylindrical body, a one-side cam surface of the first cam groove provided in a step portion between the sliding portion on one side and the body portion of the cylindrical body, A cam base having a second cam groove one-side cam surface provided in a step between the other sliding portion and the cylindrical body;
A first cam frame that forms an other cam surface facing the one cam surface of the first cam groove and is slidable as a non-rotating one sliding portion, and a one cam of the second cam groove A second cam frame formed on the other sliding surface to be opposed to the surface and slidably provided on the other sliding portion as non-rotating,
The cam surface is inserted into the two cam grooves formed by the first cam frame, the second cam frame, and the cam base by pressing the first cam frame and the second cam frame. A camera provided with an urging means for contact with the camera.

The camera according to claim 5, wherein
The cam body includes a spiral first cam groove, a spiral second cam groove,
One having a small-diameter sliding portion provided on one end side of the cylindrical body, and a one-side cam surface of the first cam groove that is a step provided between the sliding portion and the body portion of the cylindrical body A base portion of
A small-diameter sliding portion provided on the other end side of the cylindrical body, and a one-side cam surface of a second cam groove that is a step provided between the sliding portion and the barrel portion of the cylindrical body. The other base portion,
A cam base configured by connecting the one base portion and the other base portion;
A first cam frame formed on the other cam surface to be opposed to the one cam surface of the first cam groove and slidably provided as a non-rotating slide on one base portion, and a second cam groove A second cam frame that forms a second cam surface facing the first cam surface, and is slidably provided as a non-rotating slide portion on the other base portion;
The cam surface is inserted into the two cam grooves formed by the first cam frame, the second cam frame, and the cam base by pressing the first cam frame and the second cam frame. A camera provided with an urging means for contact with the camera.

The camera according to claim 5, wherein
A focusing lens that moves and focuses by motor drive;
A focus motor is disposed in the vicinity of the first reduction gear group, and the motor for zooming is disposed in the vicinity of the second reduction gear group , and the focus motor is provided. A camera provided with an optical zoom mechanism, wherein the rotation axis direction of the rotation axis of the motor is disposed as the optical axis direction of the zoom lens.