JP3404117B2

JP3404117B2 - Lens barrel

Info

Publication number: JP3404117B2
Application number: JP08661694A
Authority: JP
Inventors: 光將大久保; 勢子斉藤
Original assignee: Olympus Optic Co Ltd
Current assignee: Olympus Corp
Priority date: 1994-04-25
Filing date: 1994-04-25
Publication date: 2003-05-06
Anticipated expiration: 2018-05-06
Also published as: JPH07294791A

Description

【発明の詳細な説明】【０００１】【産業上の利用分野】本発明は、撮影光学系を有するレ
ンズ鏡筒、詳しくは、上記撮影光学系の光束の外側に、
帯状に形成されたフレキシブルプリント基板を多角形に
折り曲げた形状で配置したレンズ鏡筒に関する。【０００２】【従来の技術】従来、撮影光学系を有するレンズ鏡筒な
どの筒状の筐体内部に配置されるフレキシブルプリント
基板は、種々提案されており、例えば実開昭６３−１０
６１９０号公報には、円筒状もしくは多角筒状の筐体内
の壁面に沿って収納するために、帯状の基板を略多角形
状に折り曲げ、その折曲部の間の平面部に電気部品を実
装し、筐体の軸方向と略平行にして前記筐体内に収納す
るように構成したフレキシブルプリント基板が開示され
ている。【０００３】また、本出願人は特願平５−５４３５５号
において、レンズ鏡筒内に収納するフレキシブルプリン
ト基板として、中央部に撮影光束が通過する開口部を有
する円環形状部と、該円環形状部より外方もしくは内方
に突出した電気部品を実装する突出部とを有し、この突
出部をレンズ鏡筒の光軸と略平行となるように折り曲げ
てレンズ鏡筒内に収納するような構造のフレキシブルプ
リント基板を提案している。【０００４】このようなフレキシブルプリント基板は、
レンズ鏡筒の内壁面に沿って略筒状となるように折り曲
げ成形することにより、レンズ鏡筒内の撮影光束より外
側の領域にスペース効率良く収納することができる。【０００５】【発明が解決しようとする課題】前述したような構成の
フレキシブルプリント基板では、基板上に大きな部品を
実装する場合や、ノイズの影響をおさえるために同一平
面上に近接させて多くの部品を実装させたい場合などに
は、電気部品を実装するための平面部を実装可能なだけ
大きくする必要がある。しかしながら、従来の基板を単
純に多角形の筒状に折り曲げて形成する構成では、平面
部を大きくすることによって基板の収納時の外径が大き
くなり、収納するレンズ鏡筒の径を大きくしなければな
らない問題点がある。【０００６】特に、フレキシブルプリント基板において
平面部の端部の折り曲げ部近くはストレスがかかるため
折り曲げしろを設ける必要があり、端部いっぱいまで部
品を実装することができないので、円周方向に大きな部
品を実装したり高密度実装するような場合には、より大
きな面積の平面部が必要となり、基板の収納時の外径が
大きくなって収納するレンズ鏡筒が大径化してしまう問
題点が生じる。【０００７】本発明は、これらの事情に鑑みてなされた
もので、フレキシブルプリント基板をスペース効率よく
収納することができ、かつ外径を最小限に抑えることが
可能なレンズ鏡筒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】本発明によるレンズ鏡筒
は、折曲部によって折り曲げて多角形の筒状に形成され
たフレキシブルプリント基板を収納したレンズ鏡筒にお
いて、上記フレキシブルプリント基板は、電気部品が実
装されていて、帯状に形成された接続部から所定の突出
幅で突出して形成された平面を有する第１の平面部と、
電気部品が実装されていて、少なくとも上記第１の平面
部の突出幅よりも広がった突出幅であって上記折曲部の
間隔よりも大きい突出幅の部分を有して形成された平面
を有する第２の平面部と、を有し、上記第１の平面部お
よび第２の平面部が、上記帯状の接続部に対して光軸と
略平行かつ重なった状態で円周方向に隣接するように折
り曲げられ、当該第１の平面部における円周方向端部の
上方に、当該第２の平面部少なくとも一部がせりだすよ
うに配置されて、当該第２の平面部に実装される上記電
気部品の実装領域が大きくなるように実装されているこ
とを特徴とする。【０００９】【００１０】【実施例】以下、図面を参照して本発明の実施例を説明
する。図１ないし図４は本発明の第１実施例に係り、図
１は本実施例のフレキシブルプリント基板をレンズ鏡筒
内に収納した状態を示す透視図、図２はフレキシブルプ
リント基板の展開形状を示す展開図、図３はレンズ鏡筒
内へ収納する際にフレキシブルプリント基板を折り曲げ
た状態での形状構成を示す斜視図、図４はレンズ鏡筒内
に収納した状態のフレキシブルプリント基板の構成を示
す断面図である。【００１１】本実施例のフレキシブルプリント基板は、
レンズ鏡筒内に収納する折り曲げ可能な基板であって、
レンズ鏡筒の内壁面の周方向に沿って多角形の筒状に折
り曲げた状態でレンズ鏡筒内に収納する構造となってい
る。【００１２】本実施例では、フレキシブルプリント基板
をカメラのレンズ鏡筒内に収納する場合の構成例を説明
する。図１はフレキシブルプリント基板をレンズ鏡筒内
に収納した状態を示したものである。【００１３】フレキシブルプリント基板１は、電気部品
が実装され、略帯状に成形したものを多角形の環状に折
り曲げた形状でレンズ鏡筒２の外枠３内に収納されるよ
うになっている。レンズ鏡筒２の内部には撮影レンズ４
が設けられ、撮影光束５の通過領域より外側の外枠３内
の領域に、部品実装平面が撮影レンズの光軸と略平行に
なるように、フレキシブルプリント基板１が円周方向に
配置されるようになっている。また、前記フレキシブル
プリント基板１は保持部材としての略円筒状の台座１５
により保持されている。このフレキシブルプリント基板
１を収納したレンズ鏡筒２は、カメラ本体６に装着され
るようになっている。なお、図中の符号７は撮影面（カ
メラのフィルム面）を示している。【００１４】フレキシブルプリント基板１は、図２に示
すような展開形状となっており、帯状に形成された接続
部８と、この接続部８の長手方向と直交する方向に突出
形成された平面部９ａ〜９ｆとを有して構成されてい
る。前記平面部９ａ〜９ｆの内、平面部９ａ，９ｄ，９
ｆは接続部８から一定の突出幅で突出しており、平面部
９ｂ，９ｃ，９ｅは、基端部では平面部９ａ，９ｄ，９
ｆと同じ突出幅であるが、途中より突出方向と直角方向
に幅が少し広がって突出した形状となっている。前記平
面部９ａ〜９ｆには、電気部品１０ａ〜１０ｊが実装さ
れるようになっており、前記接続部８には電気回路を構
成する配線パターン１１が配設され、平面部９ａ〜９ｆ
が電気的に接続されている。【００１５】また、前記平面部９ａ〜９ｆの基端部に
は、図中破線で示す折曲部１３が、接続部８には折曲部
１４がそれぞれ形成されており、フレキシブルプリント
基板１がレンズ鏡筒２内に収納される際にはこれらの折
曲部１３，１４によって折り曲げられて多角形の筒状に
成形されるようになっている。【００１６】この基板の構成では、電気部品を実装する
平面部と配線パターンを配設する帯状部とを有してお
り、帯状部を配線パターン専用の領域として用いること
ができるため、部品間を結ぶ配線の引き回しが容易であ
り、配線設計の自由度が増し、より高密度な電気部品の
実装、及び効率的でかつ性能を十分確保した基板設計が
可能となる。【００１７】次に、レンズ鏡筒２内に収納する際のフレ
キシブルプリント基板１の組み付け方法について説明す
る。【００１８】まず、フレキシブルプリント基板１の平面
部９ａ〜９ｆを折曲部１３に沿って電気部品１０ａ〜１
０ｊが実装された部品面を外側にして略１８０゜折り曲
げ、平面部９ａ〜９ｆの電気部品が実装されていない面
を接続部８に重ね合わせる。次いで、略帯状に成形され
たフレキシブルプリント基板１を、平面部９ａ〜９ｆの
部品面が外側になるように折曲部１４に沿って折り曲
げ、図３に示すように、多角形（略６角形）の筒状に成
形する。【００１９】フレキシブルプリント基板１は、平面部９
ｂ，９ｃ，９ｅの突出幅が接続部８の折曲部１４の間隔
よりも大きくなっているため、図３の組立形状におい
て、多角形の筒状となった接続部８の平面部外周の一辺
より平面部９ｂ，９ｃ，９ｅの周方向の寸法が長く、平
面部９ｂ，９ｃ，９ｅの周方向の端部が多角形状の接続
部８の平面部外周より少しはみ出して平面部９ａ，９
ｄ，９ｆの端部上方に重なった形となる。なお、平面部
９ａ，９ｄ，９ｆは多角形状の接続部８の平面部外周よ
り突出しないようになっている。【００２０】このように成形されたフレキシブルプリン
ト基板１を、図４に示すように保持部材としての略円筒
状の台座１５と共にレンズ鏡筒２内に収納し、台座１５
の外周部とレンズ鏡筒の外枠３の内周部との間の空間１
６に配置する。図４はレンズ鏡筒を図１のＡ−Ａ線で切
断した断面図である。【００２１】前記台座１５は、外周面は平面部１５ａが
周方向に形成された多角柱状に、内周面は円筒状に形成
され、中央部に開口部１５ｂを有する略円筒形状の構成
となっており、例えばプラスチック等で形成されてい
る。フレキシブルプリント基板１は、台座の平面部１５
ａに電気部品１０ａ〜１０ｊを実装した基板の平面部９
ａ〜９ｆが対応して接して配置されるように、台座１５
の外周部に組み付けられて収納される。なお、台座１５
の内周側の開口部１５ｂは、レンズ鏡筒２における撮影
光束５の通過領域の径よりも大きな径となっている。【００２２】平面部９ｂ，９ｃ，９ｅは、収納時の形状
において、他の平面部や多角形状となった接続部８の平
面部よりも周方向に大きく形成されており、多角形状の
接続部８の平面部外周より少し突出して平面部９ａ，９
ｄ，９ｆの上に重なった状態でレンズ鏡筒２内に配置さ
れる。このように組み付けた状態で、フレキシブルプリ
ント基板１はレンズ鏡筒２の後方から組み込まれて鏡筒
内に収納される。【００２３】以上説明したように、本実施例では、フレ
キシブルプリント基板を、電気部品が実装された第１及
び第２の平面部と、これら第１及び第２の平面部を接続
する配線部を設けた接続部とを有して構成し、多角形の
筒状に成形してレンズ鏡筒内に収納する際に、第１の平
面部における円周方向の端部上方に、第２の平面部の少
なくとも一部がせりだすように配置し、円周方向に大き
な部品実装領域を得るようにして大型の部品の実装や周
方向に高密度の実装を可能にしている。【００２４】フレキシブルプリント基板に大きなチップ
部品を実装する場合、いくつかの平面部を他の平面部よ
りも周方向に大きく形成し、この平面部に大型の部品を
実装して、周方向に隣接する平面部の端部上方に一部が
突出して重なるように多角形の筒状に構成することによ
り、筒状に形成したフレキシブルプリント基板の径が小
さくなる。【００２５】本実施例の構成によれば、大きな電気部品
の実装等において必要とされる、円周方向に大きな部品
実装領域を持つ平面を得ることができ、また、多角形の
筒状に形成したフレキシブルプリント基板の径を小さく
できるため、収納するレンズ鏡筒の径を最小限にするこ
とが可能となる。また、本実施例ではフレキシブルプリ
ント基板の構成を帯状の接続部とこの接続部より突出形
成された平面部とからなる形状としているため、展開形
状において基板の面積を小さくすることができ、例えば
円環状に形成したものに比べて、面積効率良く基板取り
を行うことができる。【００２６】次に、本発明の第２実施例について説明す
る。【００２７】図５ないし図７は本発明の第２実施例に係
り、図５はフレキシブルプリント基板の展開形状を示す
展開図、図６はレンズ鏡筒内へ収納する際にフレキシブ
ルプリント基板を折り曲げた状態での形状構成を示す斜
視図、図７はレンズ鏡筒内に収納した状態のフレキシブ
ルプリント基板の構成を示す断面図である。【００２８】第２実施例は、フレキシブルプリント基板
の展開形状を変更した例であり、第１実施例と異なる部
分についてのみ説明する。【００２９】第２実施例のフレキシブルプリント基板３
１は、図５に示すような展開形状となっており、中央に
撮影光束が通過する円状の開口部を有し外周部が多角形
状に形成された円環形状の接続部３８と、この接続部３
８の外周方向に突出形成された平面部３９ａ〜３９ｆと
を有して構成されている。前記平面部３９ａ〜３９ｇの
内、平面部３９ａ，３９ｄ，３９ｆは接続部３８の外周
部から一定の突出幅で突出しており、平面部３９ｂ，３
９ｃ，３９ｅは、基端部では突出幅が平面部３９ａ，３
９ｄ，３９ｆと同じであるが、途中より幅が少し広がっ
た形状となっている。前記平面部３９ａ〜３９ｆには、
電気部品１０ａ〜１０ｊが実装されるようになってお
り、前記接続部３８には電気回路を構成する配線パター
ンが配設され、平面部３９ａ〜３９ｆが電気的に接続さ
れている。【００３０】また、前記平面部３９ａ〜３９ｆの基端部
には、図中破線で示す折曲部３２が形成されており、フ
レキシブルプリント基板３１がレンズ鏡筒内に収納され
る際にはこれらの折曲部３２によって折り曲げられて多
角形の筒状に成形されるようになっている。【００３１】次に、本実施例のフレキシブルプリント基
板３１をレンズ鏡筒内に収納する際の組み付け方法につ
いて説明する。【００３２】まず、フレキシブルプリント基板３１の平
面部３９ａ〜３９ｆを折曲部３２に沿って電気部品１０
ａ〜１０ｊが実装された部品面を外側にして略９０゜折
り曲げ、図６に示すように、多角形（略６角形）の筒状
に成形する。【００３３】フレキシブルプリント基板３１は、平面部
３９ｂ，３９ｃ，３９ｅの突出幅が接続部３８の外周部
の一辺の長さよりも大きくなっているため、図６の組立
形状において、多角形の筒状となった基板外周の一辺よ
り平面部３９ｂ，３９ｃ，３９ｅの周方向の寸法が長
く、平面部３９ｂ，３９ｃ，３９ｅの周方向の端部が基
板の多角形部分の外周より少しはみ出して平面部３９
ａ，３９ｄ，３９ｆの端部上方に重なった形となる。な
お、平面部３９ａ，３９ｄ，３９ｆは基板の多角形部分
の外周より突出しないようになっている。【００３４】このように成形されたフレキシブルプリン
ト基板３１を、図７に示すように略円筒状の台座１５と
共にレンズ鏡筒２内に収納し、台座１５の外周部とレン
ズ鏡筒の外枠３の内面との間の空間１６に配置する。図
７は図４と同様の切断面でレンズ鏡筒を切断した断面図
である。【００３５】第１実施例と同様に、フレキシブルプリン
ト基板３１は、台座の平面部に電気部品１０ａ〜１０ｊ
を実装した基板の平面部３９ａ〜３９ｆが対応して配置
されるように、台座１５の外周部に組み付けられて収納
される。【００３６】平面部３９ｂ，３９ｃ，３９ｅは、収納時
の形状において、他の平面部よりも周方向に大きく形成
されており、台座１５の外周部に対応する基板の多角形
部分の外周より少し突出して平面部３９ａ，３９ｄ，３
９ｆの上に重なった状態でレンズ鏡筒２内に配置され
る。このように組み付けた状態で、フレキシブルプリン
ト基板３１はレンズ鏡筒２の後方から組み込まれて鏡筒
内に収納される。【００３７】このように、フレキシブルプリント基板の
いくつかの平面部を他の平面部よりも周方向に大きく形
成し、周方向に隣接する平面部の端部上方に一部が突出
して重なるように円環状の基板を折り曲げて多角形の筒
状に構成することにより、この平面部に大型の部品を実
装可能であり、かつ平面部に重なり合う部分を設けない
場合に比べて筒状に形成したフレキシブルプリント基板
の径を小さくすることができ、収納するレンズ鏡筒の径
を小さくすることができる。【００３８】この第２実施例の構成では、円環状の基板
を平面部と接続部との間の折曲部で略９０゜折り曲げて
多角形の筒状に成形しており、折曲部における折り曲げ
角度が小さいので、折曲部において基板や配線パターン
が切断されてしまうおそれがない。また、収納する状態
で台座の外周面上に直接、部品を実装した平面部が配置
されるため、第１実施例の構成に比べると接続部の分だ
け厚みが少なく、収納時のフレキシブルプリント基板の
径及びレンズ鏡筒の径をより小さくすることができる。
また、フレキシブルプリント基板の接続部の構成を円環
状の形状としているため、部品を実装した平面部間の配
線の引き回しを短くすることができ、配線の設計を容易
にできると共に、ノイズ等の影響を少なくすることがで
きる。【００３９】なお、前述した第１及び第２実施例におい
て、フレキシブルプリント基板が収納されるレンズ鏡筒
は、例えばレンズ交換式一眼レフカメラに装着されるも
のに適用されるが、これに限らず、他の装置に適用する
こともできる。【００４０】また、フレキシブルプリント基板の構成は
図示したものに限定されるものではない。フレキシブル
プリント基板において、平面部の形状、数、大きさ等を
異ならせたものでも同様の作用効果が得られる。また、
フレキシブルプリント基板はレンズ鏡筒の円周全周にわ
たって配置されない構成としても良く、フレキシブルプ
リント基板が設けられない円周方向の空間に機械部品等
他のものを配置しても良い。また、フレキシブルプリン
ト基板の各平面部を接続する接続部は、必ずしも帯状や
円弧状に限らず他の形状でも良い。【００４１】［付記］以上詳述した如き本発明の実施態
様によれば、以下の如き構成を得ることができる。すな
わち、（１）撮影光学系を有するレンズ鏡筒内で、かつ撮影
光束の外側に配置されるフレキシブルプリント基板にお
いて、電気部品が実装され、前記撮影光学系の光軸と略
平行に形成された第１及び第２の平面部と、これら第１
及び第２の平面部から前記光軸に沿った方向に引き出さ
れ、かつ円周方向に前記第１及び第２の平面部を電気的
に接続する接続部と、を具備しており、前記第１の平面
部における円周方向の端部上方に、前記第２の平面部の
少なくとも一部がせりだすよう配置されていることを特
徴とするフレキシブルプリント基板。【００４２】（２）撮影光学系を有するレンズ鏡筒内
で、かつ撮影光束の外側に配置されるフレキシブルプリ
ント基板において、電気部品が実装され、前記撮影光学
系の光軸と略平行に配置された第１及び第２の平面部
と、これら第１及び第２の平面部における前記光軸に沿
った方向の端部に連結され、円周方向に前記第１及び第
２の平面部を電気的に接続する接続部と、を具備してお
り、前記第１の平面部における円周方向の端部上方に、
前記第２の平面部の少なくとも一部がせりだすよう配置
されていることを特徴とするフレキシブルプリント基
板。【００４３】（３）撮影光学系を有するレンズ鏡筒内
で、かつ撮影光束の外側にフレキシブルプリント基板を
配置する、フレキシブルプリント基板の保持構造におい
て、前記レンズ鏡筒に設けられた円筒状の保持部材と、
前記フレキシブルプリント基板に設けられ、前記保持部
材の外周と前記レンズ鏡筒の内周との間に配置された第
１及び第２の平面部と、前記フレキシブルプリント基板
に設けられ、前記第１及び第２の平面部を電気的に接続
する接続部と、を具備しており、前記第１の平面部にお
ける円周方向の端部上方に、前記第２の平面部の少なく
とも一部がせりだすよう配置されていることを特徴とす
る、フレキシブルプリント基板の保持構造。【００４４】（４）撮影光学系を有するレンズ鏡筒内
で、かつ撮影光束の外側にフレキシブルプリント基板を
配置する、フレキシブルプリント基板の保持構造におい
て、前記レンズ鏡筒に設けられ、少なくとも外周面が多
角柱状に形成された筒状の保持部材と、前記フレキシブ
ルプリント基板に設けられ、前記保持部材の外周と前記
レンズ鏡筒の内周との間で、かつ前記保持部材の外周面
における隣接する平面に接して配置された第１及び第２
の平面部と、前記フレキシブルプリント基板に設けら
れ、前記第１及び第２の平面部を電気的に接続する接続
部と、を具備しており、前記第１の平面部における円周
方向の端部上方に、前記第２の平面部の少なくとも一部
がせりだすよう配置されていることを特徴とする、フレ
キシブルプリント基板の保持構造。【００４５】（５）撮影光学系を有するレンズ鏡筒内
で、かつ撮影光束の外側にフレキシブルプリント基板を
配置する、フレキシブルプリント基板の保持構造におい
て、前記レンズ鏡筒に設けられ、少なくとも外周面が多
角柱状に形成された筒状の保持部材と、前記フレキシブ
ルプリント基板に設けられ、前記保持部材の外周と前記
レンズ鏡筒の内周との間に配置された第１及び第２の平
面部と、前記フレキシブルプリント基板に設けられ、前
記第１及び第２の平面部を電気的に接続する接続部と、
を具備しており、前記第１の平面部は、前記保持部材の
外周平面の一つに、前記第２の平面部が配置された隣接
する他の外周平面側にせりだすことなく接触して配置さ
れ、前記第２の平面部は、該第１の平面部の端部上方に
少なくとも一部がせりだすよう、前記他の外周平面に接
触して配置されていることを特徴とする、フレキシブル
プリント基板の保持構造。【００４６】（６）撮影光学系を有するレンズ鏡筒内
に配置されるフレキシブルプリント基板において、前記
撮影光学系の光軸に対し略垂直な平面上であって、中央
に撮影光束が通過する開口部を有する円環形状もしくは
円弧形状に形成された第１部分と、この第１部分より外
側に突出すると共に、その幅が突出する部分の基端部よ
り大である部分を持ち、かつ電気部品が実装された第２
部分と、を具備しており、前記レンズ鏡筒内に配置され
た際に、前記第２部分における電気部品の実装面が前記
撮影光学系の光軸に対して略平行となるように、該第２
部分を前記第１部分に対して曲折することを特徴とする
フレキシブルプリント基板。【００４７】【発明の効果】以上説明したように本発明によれば、折
曲部によって折り曲げて多角形の筒状に形成されたフレ
キシブルプリント基板を収納したレンズ鏡筒において、
円周方向に大きな部品の実装領域を持つ平面を得ること
ができ、大型の部品の実装や周方向で高密度の実装が可
能なフレキシブルプリント基板を提供することができ
る。また、収納するレンズ鏡筒の径を最小限に抑えるこ
とが可能なフレキシブルプリント基板と提供することが
できる。さらに、当該フレキシブルプリント基板は帯状
の接続部とこの接続部より突出して形成された平面部と
を有しているので、展開形状において基板の面積を小さ
くすることができ、例えば、円環状に形成したものに比
べ、面積効率良く基板取りをすることができる。 Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser having an imaging optical system.
Lens barrel, more specifically, outside the luminous flux of the shooting optical system,
A flexible printed circuit board formed in a belt shape
The present invention relates to a lens barrel arranged in a bent shape . 2. Description of the Related Art Conventionally, various types of flexible printed circuit boards arranged in a cylindrical housing such as a lens barrel having a photographing optical system have been proposed.
No. 6190 discloses that a band-shaped substrate is bent into a substantially polygonal shape in order to be accommodated along a wall surface inside a cylindrical or polygonal cylindrical housing, and an electric component is mounted on a flat portion between the bent portions. There is disclosed a flexible printed board configured to be housed in the housing substantially in parallel with the axial direction of the housing. In Japanese Patent Application No. 5-54355, the applicant of the present invention discloses a flexible printed circuit board accommodated in a lens barrel, which has an annular portion having an opening through which a photographing light beam passes, and A projection for mounting an electric component protruding outward or inward from the ring-shaped portion, and bending the projection so as to be substantially parallel to the optical axis of the lens barrel and storing it in the lens barrel. A flexible printed circuit board having such a structure is proposed. [0004] Such a flexible printed circuit board is
By bending and forming the lens barrel so as to be substantially cylindrical along the inner wall surface, the lens barrel can be efficiently stored in a region outside the photographic light beam in the lens barrel. [0005] In the flexible printed circuit board having the above-described structure, when a large component is mounted on the board, or when a large number of components are mounted on the same plane in order to suppress the influence of noise, many parts are provided. For example, when a component is to be mounted, the plane portion for mounting the electric component needs to be as large as possible. However, in the conventional configuration in which the substrate is simply bent into a polygonal cylindrical shape, the outer diameter of the substrate when the substrate is stored is increased by enlarging the plane portion, and the diameter of the lens barrel to be stored must be increased. There are issues that must be addressed. In particular, in the flexible printed circuit board, stress is applied near the bent portion at the end of the flat portion, so that it is necessary to provide a bending margin, and it is not possible to mount the component to the entire end. In the case of mounting or high-density mounting, a flat portion with a larger area is required, and the outer diameter when the substrate is stored becomes large, and the diameter of the lens barrel to be stored becomes large. . [0007] The present invention has been made in view of these circumstances, and a flexible printed circuit board can be efficiently used.
Can be stored and minimized outer diameter
It is an object to provide a possible lens barrel . [0008] A lens barrel according to the present invention is formed into a polygonal cylindrical shape by being bent by a bent portion.
Into a lens barrel containing a flexible printed circuit board.
In the flexible printed circuit board, electrical components are
Is mounted and has a predetermined protrusion from the strip-shaped connection part.
A first plane portion having a plane formed to protrude with a width;
An electric component is mounted, and at least the first plane
Projection width that is wider than the projection width of the bent part
A plane formed with a portion with a protrusion width larger than the interval
And a second flat portion having the first flat portion and the second flat portion.
And the second plane portion is aligned with the optical axis with respect to the strip-shaped connection portion.
Fold them so that they are adjacent to each other in the circumferential direction while
Bent at the circumferential end of the first flat portion.
At least a part of the second flat portion protrudes upward.
And the above-mentioned electrodes mounted on the second plane portion.
Components are mounted so that the mounting area of
And features . An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 relate to a first embodiment of the present invention. FIG. 1 is a perspective view showing a state in which a flexible printed circuit board of the present embodiment is housed in a lens barrel. FIG. FIG. 3 is a perspective view showing a configuration of the flexible printed circuit board in a state where the flexible printed circuit board is bent when the flexible printed circuit board is stored in the lens barrel. FIG. 4 is a perspective view showing a configuration of the flexible printed circuit board stored in the lens barrel. FIG. The flexible printed circuit board of this embodiment is
A bendable substrate housed in a lens barrel,
The lens barrel is housed in the lens barrel in a state of being bent into a polygonal tubular shape along the circumferential direction of the inner wall surface of the lens barrel. In this embodiment, an example of a configuration in which a flexible printed circuit board is housed in a lens barrel of a camera will be described. FIG. 1 shows a state in which a flexible printed circuit board is housed in a lens barrel. An electric component is mounted on the flexible printed circuit board 1, and a flexible printed circuit board 1 is housed in the outer frame 3 of the lens barrel 2 in a shape obtained by bending a substantially band shape into a polygonal ring. A photographing lens 4 is provided inside the lens barrel 2.
Is provided, and the flexible printed circuit board 1 is arranged in a circumferential direction in a region inside the outer frame 3 outside the passing region of the photographing light beam 5 so that the component mounting plane is substantially parallel to the optical axis of the photographing lens. It has become. The flexible printed circuit board 1 has a substantially cylindrical base 15 as a holding member.
Is held by The lens barrel 2 containing the flexible printed circuit board 1 is mounted on the camera body 6. Note that reference numeral 7 in the drawing indicates a photographing surface (film surface of the camera). The flexible printed circuit board 1 has a developed shape as shown in FIG. 2, and has a connecting portion 8 formed in a belt shape and a flat portion protruding in a direction perpendicular to the longitudinal direction of the connecting portion 8. 9a to 9f. Of the flat portions 9a to 9f, the flat portions 9a, 9d, 9
f protrudes from the connecting portion 8 with a certain protruding width, and the flat portions 9b, 9c, 9e are flat portions 9a, 9d, 9 at the base end.
It has the same protruding width as f, but has a shape in which the width slightly increases in the direction perpendicular to the protruding direction from the middle and protrudes. Electrical components 10a to 10j are mounted on the flat portions 9a to 9f, and a wiring pattern 11 forming an electric circuit is disposed on the connecting portion 8, and the flat portions 9a to 9f are provided.
Are electrically connected. A bent portion 13 indicated by a broken line in the figure and a bent portion 14 are formed at the base end of the flat portions 9a to 9f, respectively. When housed in the lens barrel 2, it is bent by these bent portions 13 and 14 and formed into a polygonal cylindrical shape. In this configuration of the substrate, there are a flat portion on which electric components are mounted and a band portion on which a wiring pattern is provided. Since the band portion can be used as a region dedicated to the wiring pattern, the space between the components can be reduced. The wiring to be connected can be easily routed, and the degree of freedom in wiring design increases, so that it is possible to mount electric components with higher density and to design a board that is efficient and has sufficient performance. Next, a method of assembling the flexible printed circuit board 1 when housed in the lens barrel 2 will be described. First, the flat parts 9a to 9f of the flexible printed circuit board 1 are cut along the bent parts 13 into the electric parts 10a to 1f.
The surface on which the electric component is not mounted is superimposed on the connection portion 8 by bending the surface on which the electric component is not mounted on the flat portions 9a to 9f with the component surface on which 0j is mounted outward. Next, the flexible printed circuit board 1 formed in a substantially strip shape is bent along the bent portion 14 so that the component surfaces of the flat portions 9a to 9f are outside, and as shown in FIG. ). The flexible printed board 1 has a flat portion 9
Since the protrusion widths of b, 9c, and 9e are larger than the interval between the bent portions 14 of the connecting portion 8, in the assembled shape of FIG. The circumferential dimension of the flat portions 9b, 9c, 9e is longer than one side, and the circumferential ends of the flat portions 9b, 9c, 9e protrude slightly from the outer circumference of the flat portion of the polygonal connecting portion 8 to form the flat portions 9a, 9a.
d, 9f are overlapped above the ends. The flat portions 9a, 9d, 9f do not protrude from the outer periphery of the flat portion of the polygonal connecting portion 8. The flexible printed board 1 thus formed is housed in the lens barrel 2 together with a substantially cylindrical pedestal 15 as a holding member as shown in FIG.
1 between the outer periphery of the lens barrel and the inner periphery of the outer frame 3 of the lens barrel
Place at 6. FIG. 4 is a sectional view of the lens barrel taken along line AA in FIG. The pedestal 15 has an outer peripheral surface formed in a polygonal column shape in which a flat portion 15a is formed in the circumferential direction, an inner peripheral surface formed in a cylindrical shape, and has a substantially cylindrical configuration having an opening 15b in a central portion. And is made of, for example, plastic or the like. The flexible printed circuit board 1 includes a flat portion 15 of the pedestal.
plane part 9 of a substrate on which electric components 10a to 10j are mounted
a to 15f so that the bases 15a to 9f are disposed in contact with each other.
Is assembled and housed in the outer peripheral portion. The pedestal 15
The opening 15b on the inner peripheral side of the lens barrel 2 has a diameter larger than the diameter of the passage area of the photographing light beam 5 in the lens barrel 2. The flat portions 9b, 9c and 9e are formed so as to be larger in the circumferential direction than the other flat portions and the flat portions of the polygonal connecting portion 8 in the shape of the storage portion when stored. 8 projecting slightly from the outer periphery of the plane portion 9
d, 9f are arranged in the lens barrel 2 in a state of being superimposed on them. In this assembled state, the flexible printed circuit board 1 is assembled from the rear of the lens barrel 2 and stored in the lens barrel. As described above, in this embodiment, the flexible printed circuit board is composed of the first and second flat portions on which electric components are mounted, and the wiring portion for connecting the first and second flat portions. And a connection portion provided in the lens barrel. When the lens is formed into a polygonal cylindrical shape and housed in the lens barrel, a second flat surface is provided above the circumferential end of the first flat portion. The parts are arranged so that at least a part thereof protrudes, and a large component mounting area is obtained in the circumferential direction, so that mounting of large components and high-density mounting in the circumferential direction are enabled. When a large chip component is mounted on a flexible printed circuit board, some plane portions are formed larger in the circumferential direction than other plane portions, and a large component is mounted on this flat portion so as to be adjacent in the circumferential direction. The diameter of the flexible printed circuit board formed in a cylindrical shape is reduced by forming the polygonal tubular shape so that a part thereof protrudes and overlaps above the end of the flat portion to be formed. According to the structure of this embodiment, it is possible to obtain a plane having a large component mounting area in the circumferential direction required for mounting a large electric component and the like, and to form a polygonal cylindrical shape. Since the diameter of the flexible printed circuit board can be reduced, the diameter of the lens barrel to be housed can be minimized. Further, in the present embodiment, since the configuration of the flexible printed board is formed of a band-shaped connecting portion and a flat portion protruding from the connecting portion, the area of the board can be reduced in the developed shape, and for example, a circular Substrate removal can be performed with a higher area efficiency than that formed in an annular shape. Next, a second embodiment of the present invention will be described. FIGS. 5 to 7 relate to a second embodiment of the present invention. FIG. 5 is a developed view showing a developed shape of a flexible printed circuit board. FIG. 6 is a view showing a state in which the flexible printed circuit board is bent when housed in a lens barrel. FIG. 7 is a cross-sectional view showing the configuration of the flexible printed circuit board in a state housed in a lens barrel. The second embodiment is an example in which the developed shape of the flexible printed circuit board is changed, and only different portions from the first embodiment will be described. The flexible printed circuit board 3 of the second embodiment
Reference numeral 1 denotes an unfolded shape as shown in FIG. 5, an annular connection portion 38 having a circular opening at the center through which a photographing light beam passes and having an outer peripheral portion formed in a polygonal shape. Connection part 3
8 has flat portions 39a to 39f protruding in the outer peripheral direction. Of the flat portions 39a to 39g, the flat portions 39a, 39d, and 39f protrude from the outer peripheral portion of the connection portion 38 with a constant protrusion width.
9c and 39e have flat portions 39a and 3
Same as 9d and 39f, but has a shape slightly wider than the middle. The flat portions 39a to 39f include:
The electric parts 10a to 10j are mounted, and a wiring pattern constituting an electric circuit is provided in the connection part 38, and the plane parts 39a to 39f are electrically connected. A bent portion 32 shown by a broken line in the figure is formed at the base end of the flat portions 39a to 39f. When the flexible printed board 31 is stored in the lens barrel, these bent portions 32 are formed. Is bent by the bent portion 32 of the above to form a polygonal cylindrical shape. Next, an assembling method for accommodating the flexible printed circuit board 31 of this embodiment in a lens barrel will be described. First, the flat parts 39a to 39f of the flexible printed circuit board 31 are
The part on which the components a to 10j are mounted is bent outward at about 90 ° so that the part is formed into a polygonal (substantially hexagonal) cylindrical shape as shown in FIG. The flexible printed circuit board 31 has a polygonal cylindrical shape in the assembled shape of FIG. 6 because the projecting width of the flat portions 39b, 39c, 39e is larger than the length of one side of the outer peripheral portion of the connecting portion 38. The circumferential dimension of the flat portions 39b, 39c, 39e is longer than one side of the outer periphery of the substrate, and the circumferential ends of the flat portions 39b, 39c, 39e slightly protrude from the outer circumference of the polygonal portion of the substrate. 39
a, 39d, and 39f are overlapped above the ends. The flat portions 39a, 39d, 39f do not protrude from the outer periphery of the polygonal portion of the substrate. The thus formed flexible printed circuit board 31 is housed in the lens barrel 2 together with the substantially cylindrical pedestal 15 as shown in FIG. 7, and the outer peripheral portion of the pedestal 15 and the outer frame 3 of the lens barrel are mounted. Is arranged in the space 16 between the inner surface and the inner surface. FIG. 7 is a cross-sectional view of the lens barrel cut along a cut surface similar to FIG. As in the first embodiment, the flexible printed circuit board 31 has electric components 10a to 10j
Are mounted on the outer peripheral portion of the pedestal 15 and stored so that the planar portions 39a to 39f of the board on which the is mounted are arranged correspondingly. The flat portions 39b, 39c and 39e are formed larger in the circumferential direction than the other flat portions in the shape when stored, and are slightly smaller than the outer circumference of the polygonal portion of the substrate corresponding to the outer circumference of the pedestal 15. Projecting flat portions 39a, 39d, 3
9f is arranged in the lens barrel 2 in a state of being superimposed on 9f. In this assembled state, the flexible printed circuit board 31 is assembled from the rear of the lens barrel 2 and housed in the lens barrel. As described above, some plane portions of the flexible printed circuit board are formed larger in the circumferential direction than the other plane portions, and are partially projected and overlapped above the ends of the circumferentially adjacent flat portions. By bending the ring-shaped substrate into a polygonal cylindrical shape, it is possible to mount large components on this flat part, and it is more flexible than a case where there is no overlapping part on the flat part. The diameter of the printed circuit board can be reduced, and the diameter of the lens barrel to be housed can be reduced. In the structure of the second embodiment, the annular substrate is bent at approximately 90 ° at the bent portion between the flat portion and the connecting portion to form a polygonal cylindrical shape. Since the bending angle is small, there is no possibility that the substrate or the wiring pattern is cut at the bent portion. In addition, since the flat part on which the components are mounted is arranged directly on the outer peripheral surface of the pedestal in the housed state, the thickness is reduced by the connection part compared to the configuration of the first embodiment, and the flexible printed circuit board at the time of storage And the diameter of the lens barrel can be made smaller.
In addition, since the configuration of the connection portion of the flexible printed circuit board is formed in an annular shape, it is possible to shorten the routing of the wiring between the flat portions on which the components are mounted, and it is possible to easily design the wiring and to reduce the influence of noise and the like. Can be reduced. In the first and second embodiments described above, the lens barrel in which the flexible printed circuit board is housed is applied to, for example, a lens-mountable single-lens reflex camera, but is not limited to this. , Can also be applied to other devices. Further, the configuration of the flexible printed circuit board is not limited to the illustrated one. In a flexible printed circuit board, the same operation and effect can be obtained even if the shape, number, size, etc. of the flat portion are different. Also,
The flexible printed circuit board may not be disposed over the entire circumference of the lens barrel, and other components such as mechanical parts may be disposed in a circumferential space where the flexible printed circuit board is not provided. Further, the connecting portion connecting the respective flat portions of the flexible printed circuit board is not necessarily limited to a band shape or an arc shape, and may have another shape. [Appendix] According to the embodiment of the present invention described in detail above, the following configuration can be obtained. That is, (1) an electric component is mounted on a flexible printed circuit board disposed inside a lens barrel having a photographing optical system and outside a photographing light beam, and formed substantially parallel to an optical axis of the photographing optical system. First and second flat portions,
And a connection portion drawn out from the second plane portion in a direction along the optical axis and electrically connecting the first and second plane portions in a circumferential direction. A flexible printed circuit board, wherein at least a part of the second flat portion is disposed above a circumferential end of the first flat portion. (2) An electric component is mounted on a flexible printed circuit board disposed inside a lens barrel having a photographing optical system and outside a photographing light beam, and is disposed substantially parallel to the optical axis of the photographing optical system. The first and second flat portions are connected to ends of the first and second flat portions in a direction along the optical axis, and the first and second flat portions are circumferentially electrically connected. And a connection portion that connects the first flat portion and the upper portion in the circumferential direction of the first flat portion.
A flexible printed circuit board, wherein at least a part of the second plane portion is arranged to protrude. (3) In a flexible printed circuit board holding structure in which a flexible printed circuit board is arranged inside a lens barrel having a shooting optical system and outside a shooting light beam, a cylindrical holding mechanism provided in the lens barrel is provided. Components,
First and second flat portions provided on the flexible printed circuit board and disposed between the outer periphery of the holding member and the inner periphery of the lens barrel; and the first and second flat portions provided on the flexible printed circuit board. A connection portion for electrically connecting the second flat portion, wherein at least a part of the second flat portion protrudes above a circumferential end of the first flat portion. A flexible printed circuit board holding structure characterized by being arranged as follows. (4) In a flexible printed circuit board holding structure in which a flexible printed circuit board is arranged inside a lens barrel having a photographing optical system and outside a photographing light beam, at least the outer peripheral surface is provided on the lens barrel. A cylindrical holding member formed in a polygonal column shape, and a plane provided on the flexible printed circuit board, between an outer periphery of the holding member and an inner periphery of the lens barrel, and an adjacent plane on an outer peripheral surface of the holding member. First and second arranged in contact with
And a connection portion provided on the flexible printed circuit board and electrically connecting the first and second flat portions, and a circumferential end of the first flat portion is provided. A structure for holding a flexible printed circuit board, wherein at least a part of the second flat portion is disposed above the portion. (5) In a flexible printed circuit board holding structure in which a flexible printed circuit board is arranged inside a lens barrel having a photographing optical system and outside a photographing light beam, at least the outer peripheral surface is provided on the lens barrel. A cylindrical holding member formed in a polygonal column shape; and first and second flat portions provided on the flexible printed circuit board and arranged between an outer periphery of the holding member and an inner periphery of the lens barrel. A connection unit provided on the flexible printed circuit board and electrically connecting the first and second plane units;
Wherein the first plane portion is in contact with one of the outer peripheral planes of the holding member without protruding to another adjacent outer peripheral plane side on which the second planar portion is disposed. Wherein the second flat portion is disposed in contact with the other outer circumferential surface so that at least a portion thereof protrudes above an end of the first flat portion. Printed circuit board holding structure. (6) In a flexible printed circuit board disposed in a lens barrel having a photographing optical system, an opening on a plane substantially perpendicular to the optical axis of the photographing optical system and through which a photographing light beam passes in the center. An electrical component having a first portion formed in an annular or arcuate shape having a portion, a portion projecting outward from the first portion and having a width greater than a base end of the projecting portion; The second where was implemented
And wherein, when disposed in the lens barrel, the mounting surface of the electrical component in the second portion is substantially parallel to the optical axis of the imaging optical system. Second
A flexible printed circuit board, wherein a portion is bent with respect to the first portion. As described above, according to the present invention, folding
Flange formed into a polygonal cylindrical shape by bending it
In a lens barrel that houses a kibble printed circuit board,
Obtaining a plane with a large component mounting area in the circumferential direction
For large components and high-density mounting in the circumferential direction.
Can provide flexible printed circuit boards
You. Also, minimize the diameter of the lens barrel to be stored.
And can provide flexible printed circuit boards
it can. Furthermore, the flexible printed circuit board is strip-shaped
Connection portion and a flat portion protruding from the connection portion
The area of the board in the unfolded shape is small.
For example, compared to an annularly formed one.
In addition, the substrate can be efficiently removed.

【図面の簡単な説明】【図１】図１ないし図４は本発明の第１実施例に係り、
図１は本実施例のフレキシブルプリント基板をレンズ鏡
筒内に収納した状態を示す透視図【図２】第１実施例におけるフレキシブルプリント基板
の展開形状を示す展開図【図３】第１実施例における、レンズ鏡筒内へ収納する
際にフレキシブルプリント基板を折り曲げた状態での形
状構成を示す斜視図【図４】第１実施例における、レンズ鏡筒内に収納した
状態のフレキシブルプリント基板の構成を示す断面図【図５】図５ないし図７は本発明の第２実施例に係り、
図５はフレキシブルプリント基板の展開形状を示す展開
図【図６】第２実施例における、レンズ鏡筒内へ収納する
際にフレキシブルプリント基板を折り曲げた状態での形
状構成を示す斜視図【図７】第２実施例における、レンズ鏡筒内に収納した
状態のフレキシブルプリント基板の構成を示す断面図【符号の説明】１…フレキシブルプリント基板２…レンズ鏡筒５…撮影光束８…接続部９ａ〜９ｆ…平面部１０ａ〜１０ｊ…電気部品１３，１４…折曲部１５…台座BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 4 relate to a first embodiment of the present invention,
FIG. 1 is a perspective view showing a state in which a flexible printed circuit board of the present embodiment is housed in a lens barrel. FIG. 2 is a developed view showing a developed shape of the flexible printed circuit board in the first embodiment. FIG. FIG. 4 is a perspective view showing a configuration of the flexible printed circuit board in a state where the flexible printed circuit board is bent when the flexible printed circuit board is stored in the lens barrel. FIG. 4 is a configuration of the flexible printed circuit board stored in the lens barrel in the first embodiment. FIGS. 5 to 7 relate to a second embodiment of the present invention.
FIG. 5 is a developed view showing a developed shape of the flexible printed circuit board. FIG. 6 is a perspective view showing a configuration of the second embodiment in a state where the flexible printed circuit board is bent when housed in a lens barrel. Sectional view showing the structure of a flexible printed circuit board in a state accommodated in a lens barrel in the second embodiment [Description of References] 1. Flexible printed circuit board 2 ... Lens barrel 5 ... Photographing light beam 8 ... Connecting parts 9a to 9 ... 9f: flat portions 10a to 10j: electric components 13, 14: bent portion 15: pedestal

───────────────────────────────────────────────────── フロントページの続き (56)参考文献特開平５−55723（ＪＰ，Ａ) 特開平３−152984（ＪＰ，Ａ) 特開平６−265768（ＪＰ，Ａ) 特開平６−53675（ＪＰ，Ａ) 特開平６−152164（ＪＰ，Ａ) 実開昭63−106190（ＪＰ，Ｕ) 実開昭61−138267（ＪＰ，Ｕ) 実開昭63−109912（ＪＰ，Ｕ) 実開昭62−112171（ＪＰ，Ｕ) 特公昭49−29018（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.⁷，ＤＢ名) G02B 7/02 - 7/16 G03B 9/00 - 9/70 H05K 1/00 - 1/02 H05K 1/18 H05K 7/14 ──────────────────────────────────────────────────続き Continuation of the front page (56) References JP-A-5-55723 (JP, A) JP-A-3-1522984 (JP, A) JP-A-6-265768 (JP, A) JP-A-6-265768 53675 (JP, A) JP-A-6-152164 (JP, A) JP-A 63-106190 (JP, U) JP-A 61-138267 (JP, U) JP-A 63-109912 (JP, U) Japanese Utility Model Application Sho 62-112171 (JP, U) Japanese Patent Publication No. 49-29018 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) -9/70 H05K 1/00-1/02 H05K 1/18 H05K 7/14

Claims

(57) [Claims] [Claim 1] A polygonal cylindrical shape bent by a bent portion
Housing flexible printed circuit board formed in
In the zoom lens barrel, the flexible printed circuit board has electrical components mounted thereon , and the flexible printed circuit board has a connection portion formed in a belt shape.
A first surface having a flat surface protruding with a predetermined protrusion width
And an electric component mounted thereon, and at least the first plane
Projection width that is wider than the projection width of the bent part
A plane formed with a portion with a protrusion width larger than the interval
And a second flat portion having the first flat portion and the second flat portion.
Circumferential direction in a state of being substantially parallel to the optical axis and overlapping with the connecting part
And is bent so as to be adjacent to the first plane portion.
Above the circumferential end, at least the second plane portion
Is also arranged so that part thereof protrudes, and the second plane portion
The mounting area of the electrical components mounted on the
A lens barrel characterized in that it is mounted on a lens barrel.