JP2002040516A - Barrier device - Google Patents
Barrier deviceInfo
- Publication number
- JP2002040516A JP2002040516A JP2000225655A JP2000225655A JP2002040516A JP 2002040516 A JP2002040516 A JP 2002040516A JP 2000225655 A JP2000225655 A JP 2000225655A JP 2000225655 A JP2000225655 A JP 2000225655A JP 2002040516 A JP2002040516 A JP 2002040516A
- Authority
- JP
- Japan
- Prior art keywords
- barrier
- lens
- ring
- lens barrel
- drive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Blocking Light For Cameras (AREA)
- Structure And Mechanism Of Cameras (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、レンズ鏡筒の前面
にあるレンズを覆う閉位置と上記レンズ前面から退避し
た開位置とに移動可能なバリアを有するバリア装置に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barrier device having a barrier movable between a closed position for covering a lens in front of a lens barrel and an open position retracted from the front surface of the lens.
【0002】[0002]
【従来の技術】従来、レンズ鏡筒の不使用状態でレンズ
の開口を覆うことにより、埃の侵入や指等の接触による
汚れ、物との接触による傷等からレンズを保護し、ま
た、使用状態ではレンズ前面から退避して開口状態とす
るバリア(バリア羽根)が組み込まれたレンズ鏡筒に関
して、例えば、特開平5−19331号公報に開示され
たものがある。2. Description of the Related Art Conventionally, by covering an opening of a lens in a state where a lens barrel is not used, the lens is protected from dirt intrusion, dirt caused by contact with a finger or the like, and scratches caused by contact with an object. A lens barrel incorporating a barrier (barrier blade) that retracts from the front surface of the lens and is opened is disclosed, for example, in Japanese Patent Application Laid-Open No. Hei 5-19331.
【0003】[0003]
【発明が解決しようとする課題】上記特開平5−193
31号公報に開示されたレンズ鏡筒においては、バリア
は、回転リングにより駆動されるが、その回転リングが
外側のレンズ枠内周に嵌合して配設されており、結果的
に大きなスペースを必要としている。また、バリアが故
障した場合、上記回転リングがレンズ枠の後方に収納さ
れているために回転リングの交換作業が困難であった。SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 5-193 is disclosed.
In the lens barrel disclosed in Japanese Patent Publication No. 31, the barrier is driven by a rotating ring, and the rotating ring is disposed by being fitted to the inner periphery of the outer lens frame, resulting in a large space. In need. Further, when the barrier breaks down, it is difficult to replace the rotating ring because the rotating ring is housed behind the lens frame.
【0004】さらにバリアを開閉するための回動ピンが
レンズ枠を貫通しており、その回動ピンを駆動する回動
リングがレンズ枠の後方に配設されていることからレン
ズ枠の構造が複雑になっている。また、上記バリアの回
動ピンの倒れ等が発生しないようにするためにできるだ
けバリアと回転リングとを接近させる必要があるが、そ
のような配置をとるとレンズ枠の外側の取り付け部が肉
薄になってしまう。取り付け部を薄肉にすると、レンズ
枠の強度が不足し、レンズの所定の性能が得られなくな
るなどの不具合が生じる。Further, a rotating pin for opening and closing the barrier penetrates the lens frame, and a rotating ring for driving the rotating pin is disposed behind the lens frame. It's complicated. Further, in order to prevent the rotation pin of the barrier from falling down or the like, it is necessary to bring the barrier and the rotation ring as close as possible. However, when such an arrangement is adopted, the outer mounting portion of the lens frame becomes thin. turn into. If the mounting portion is made thin, there occurs a problem that the strength of the lens frame is insufficient and a predetermined performance of the lens cannot be obtained.
【0005】本発明は、上述の問題を解決するためにな
されたものであり、バリアおよびバリア駆動部の構造が
簡単で占有スペースも小さく、バリアが組み込まれるレ
ンズ鏡筒の小型化が可能であり、バリアの交換も簡単に
行えるバリア装置を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has a simple structure of a barrier and a barrier driving unit, occupies a small space, and can reduce the size of a lens barrel in which a barrier is incorporated. It is another object of the present invention to provide a barrier device that can easily replace a barrier.
【0006】[0006]
【課題を解決するための手段】本発明の請求項1記載の
バリア装置は、レンズ鏡筒前面に有るレンズと、上記レ
ンズの前面に位置し、上記レンズ光軸に垂直な平面内で
移動して上記レンズを覆う閉じ位置と上記レンズ前面か
ら待避した開位置とに移動するバリアと、上記レンズを
上記レンズ鏡筒に押さえる押さえ部材と、上記バリアを
開閉駆動するために上記押さえ部材に嵌合して回転する
駆動部材とを有しており、上記バリアは、上記駆動部材
の回転により上記閉じ位置と開位置とに駆動される。According to a first aspect of the present invention, there is provided a barrier device, comprising: a lens provided on a front surface of a lens barrel; and a movable device which is located on the front surface of the lens and moves in a plane perpendicular to the optical axis of the lens. A barrier that moves between a closed position that covers the lens and an open position that is retracted from the front surface of the lens, a holding member that holds the lens against the lens barrel, and a fitting member that fits into the holding member to open and close the barrier. The barrier is driven to the closed position and the open position by rotation of the drive member.
【0007】本発明の請求項2記載のバリア装置は、レ
ンズ鏡筒前面に有るレンズと、上記レンズの前面に位置
し、上記レンズ光軸に垂直な平面内で移動して上記レン
ズを覆う閉じ位置と上記レンズ前面から待避した開位置
とに移動するバリアと、上記バリアを上記開閉駆動する
ため上記レンズに嵌合して回転する駆動部材とを有して
おり、上記バリアは、上記駆動部材の回転により上記閉
じ位置と開位置とに駆動される。According to a second aspect of the present invention, there is provided a barrier device comprising: a lens provided on a front surface of a lens barrel; and a closing member which is located on the front surface of the lens and moves in a plane perpendicular to the optical axis of the lens to cover the lens. A barrier that moves to a position and an open position retracted from the front surface of the lens, and a driving member that fits and rotates with the lens to drive the barrier to open and close, and the barrier includes the driving member Is rotated to the closed position and the open position.
【0008】本発明の請求項3記載のバリア装置は、上
記請求項1、または、2記載のバリア装置において、上
記レンズは、その光軸方向に移動可能である。According to a third aspect of the present invention, in the barrier device according to the first or second aspect, the lens is movable in the optical axis direction.
【0009】[0009]
【発明の実施の形態】以下、図を用いて本発明の実施の
形態について説明する。図1は、本発明の第1の実施形
態を示すバリア装置が組み込まれたレンズ鏡筒の分解斜
視図である。図2は、上記レンズ鏡筒の縦断面図であ
り、図3は、図2のA−A断面図である。なお、以下の
説明において、各部材の光軸に沿う進退方向としては、
被写体側である鏡筒前カバー側方向を前方向とし、結像
側方向を後方とする。また、各部材の回転方向は、前面
側(鏡筒前カバー側)からみた回転方向で示す。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a lens barrel in which a barrier device according to a first embodiment of the present invention is incorporated. FIG. 2 is a longitudinal sectional view of the lens barrel, and FIG. 3 is a sectional view taken along line AA of FIG. In the following description, the moving direction of each member along the optical axis is as follows.
The direction toward the lens barrel front cover, which is the subject side, is defined as the front direction, and the direction toward the imaging side is defined as the rear. The rotation direction of each member is indicated by the rotation direction viewed from the front side (the lens barrel front cover side).
【0010】上記第1の実施形態のバリア装置を有する
レンズ鏡筒1は、撮影レンズを構成し、被写体側から結
像側に向けて順次配設される第1レンズ3A,第2レン
ズ3B,第3レンズ3Cと、上記各レンズを保持し、レ
ンズ光軸に沿って進退駆動される移動枠2と、レンズの
押さえ部材である押さえ環4と、バリア回転駆動用の駆
動部材である駆動環7と、バリアを支持するフランジ状
部材であるバリア支持枠5と、鏡筒前カバー6と、レン
ズ前面開閉用の上下2枚の薄板状バリア羽根であるバリ
ア8,10と、図示しない固定枠に保持され、駆動環駆
動ピン16を支持するピン支持板15と、上記移動枠2
を進退駆動する駆動機構部(図示せず)等を有してな
る。The lens barrel 1 having the barrier device according to the first embodiment constitutes a photographic lens, and is provided with a first lens 3A, a second lens 3B, and a second lens 3B sequentially arranged from the subject side toward the image forming side. A third lens 3C, a moving frame 2 that holds each lens and is driven forward and backward along the optical axis of the lens, a pressing ring 4 that is a pressing member for the lens, and a driving ring that is a driving member for rotating the barrier. 7, a barrier support frame 5 as a flange-like member for supporting the barrier, a lens barrel front cover 6, barriers 8 and 10 as upper and lower thin plate-like barrier blades for opening and closing the front surface of the lens, and a fixed frame (not shown) And a pin support plate 15 that is supported by the
And a drive mechanism (not shown) for driving the actuator forward and backward.
【0011】上記第2レンズ3Bと第3レンズ3Cは、
移動枠2に接着、また、カシメで固着される。そして、
第1レンズ3Aは、移動枠2にその外径部が嵌入され、
上記押さえ環4により押さえ付けられて保持される。The second lens 3B and the third lens 3C are
It is adhered to the moving frame 2 and fixed by caulking. And
The outer diameter portion of the first lens 3A is fitted into the moving frame 2,
It is pressed and held by the holding ring 4.
【0012】上記移動枠2には、上記第1レンズ3Aが
嵌入する開口部を有するフランジ部2cと、上記フラン
ジ部2cの裏側(後側)に斜面部2fが設けられてい
る。また、上記フランジ部2cには、押さえ環脚部挿通
用の挿通穴2aと、駆動環カム部挿通用の挿通穴2b
と、バネ懸架用ピン2gが設けられており、上記フラン
ジ部2cの外周部にはバリア保持枠、および、鏡筒カバ
ーが嵌入し装着される2つの段部2d,2eが設けられ
ている。The moving frame 2 is provided with a flange 2c having an opening into which the first lens 3A fits, and a slope 2f on the back side (rear side) of the flange 2c. The flange 2c has an insertion hole 2a for inserting the holding ring leg and an insertion hole 2b for inserting the drive ring cam.
And a spring suspension pin 2g, and a barrier holding frame and two step portions 2d and 2e into which a lens barrel cover is fitted and mounted are provided on the outer peripheral portion of the flange portion 2c.
【0013】上記押さえ環4には、第1レンズ3Aのた
めの開口4aをもつ円環部4eと、外周面4bと、先端
に爪部4cが設けられ、光軸O方向後方に向けて突出す
る3つの脚部4dとが設けられている。The holding ring 4 is provided with an annular portion 4e having an opening 4a for the first lens 3A, an outer peripheral surface 4b, and a claw portion 4c at the tip, and protrudes rearward in the optical axis O direction. And three legs 4d.
【0014】この押さえ環4は、上記脚部4dを移動枠
2の挿通穴2aを挿通させ、爪部4cを移動枠2の斜面
部2fに係合させて移動枠2に装着される。その装着状
態で第1レンズ3Aが円環部4bで移動枠2側に押圧さ
れて保持される。なお、爪部4cは、移動枠2の斜面部
2fに接着により固定され、押さえ環4が回転しないよ
うになっている。The holding ring 4 is mounted on the moving frame 2 by inserting the leg 4d into the insertion hole 2a of the moving frame 2 and engaging the claw 4c with the slope 2f of the moving frame 2. In the mounted state, the first lens 3A is pressed and held by the ring portion 4b toward the moving frame 2 side. The claw 4c is fixed to the inclined surface 2f of the moving frame 2 by bonding, so that the holding ring 4 does not rotate.
【0015】上記駆動環7には、上記押さえ環4の外周
面4bに回転可能に嵌入する内周面7aをもつ円環部7
eと、2つのバリア駆動ピン7bと、光軸O方向の後方
に向けて突出するカム部7cと、バネ懸架用支持突起7
dとが設けられている。The drive ring 7 has an annular portion 7 having an inner peripheral surface 7a rotatably fitted on the outer peripheral surface 4b of the presser ring 4.
e, two barrier drive pins 7b, a cam portion 7c projecting rearward in the direction of the optical axis O, and a support projection 7 for spring suspension.
d is provided.
【0016】この駆動環7は、上記押さえ環4の外周面
4bにその内周面7aを回転自在に嵌入させて取り付け
る。また、駆動環付勢バネ12が上記バネ懸架用突起7
dと移動枠2のバネ懸架用ピン2gに懸架されており、
駆動環7を時計回りに付勢している。その取り付け状態
でカム部7cは移動枠2の挿通穴2bを挿通しており、
駆動環駆動ピン16に当接可能な状態である。一方、、
バリア駆動ピン7bはバリア支持枠5の長穴5fを挿通
してバリア支持枠5の前面に突出し、バリア8,10の
底面に当接可能になっている。The drive ring 7 is attached to the outer peripheral surface 4b of the press ring 4 by rotatably fitting an inner peripheral surface 7a thereof. Further, the driving ring biasing spring 12 is connected to the spring suspension projection 7.
d and a spring suspension pin 2 g of the moving frame 2,
The drive ring 7 is urged clockwise. In the mounted state, the cam portion 7c is inserted through the insertion hole 2b of the moving frame 2,
It is in a state where it can abut on the drive ring drive pin 16. on the other hand,,
The barrier drive pin 7 b is inserted into the elongated hole 5 f of the barrier support frame 5, protrudes from the front surface of the barrier support frame 5, and can contact the bottom surfaces of the barriers 8 and 10.
【0017】上記バリア支持枠5には、そのフランジ状
円板部に第1レンズ3Aのためのレンズ開口5aと、バ
リア8,10が回転自在に嵌入するボス状のバリア支持
ピン5bと、バリア8,10の閉位置ストッパ5cと、
バリアバネ9,11を装着するバネ取り付けピン5d
と、バリアバネ9,11の一端が当接するバネ当接ピン
5eと、バリア駆動ピン7bが挿通する長穴5fとが設
けられている。なお、上記ピン5b,ストッパ5c,バ
ネ支持ピン5d,バネ当接ピン5e,長穴5fは、それ
ぞれ左右点対称位置に一対設けられる。The barrier support frame 5 includes a lens opening 5a for the first lens 3A in the flange-shaped disk portion, a boss-shaped barrier support pin 5b into which the barriers 8 and 10 are rotatably fitted, and a barrier. 8, 10 closed position stoppers 5c;
Spring mounting pin 5d for mounting barrier springs 9, 11
And a spring contact pin 5e with which one end of the barrier springs 9 and 11 abut, and a long hole 5f through which the barrier drive pin 7b is inserted. The pin 5b, the stopper 5c, the spring support pin 5d, the spring contact pin 5e, and the long hole 5f are provided in a pair at left and right point symmetric positions.
【0018】このバリア支持枠5は、駆動環7のバリア
駆動ピン7bを長穴5fに挿通した状態とし、移動枠2
の段部2dに嵌合させ、固着して取り付けられる。その
取り付け状態で移動枠2のフランジ部2cの前面とバリ
ア支持枠5の後側内面により駆動環7を狭持し、光軸O
方向を規制して保持する。The barrier support frame 5 has a state in which the barrier drive pin 7b of the drive ring 7 is inserted into the elongated hole 5f.
And is fixedly attached. In the mounted state, the drive ring 7 is sandwiched between the front surface of the flange portion 2c of the moving frame 2 and the rear inner surface of the barrier support frame 5, and the optical axis O
Regulate and hold direction.
【0019】上記バリア8,10は、バリア支持枠5の
レンズ開口5aを開閉可能な薄板部材であって、それぞ
れ支持穴8a,10aと、バネ当接部8b,10bと、
バリア支持枠5のストッパ5cと当接可能な切り欠き8
c,10cとが設けられている。The barriers 8, 10 are thin plate members capable of opening and closing the lens opening 5a of the barrier support frame 5, and include support holes 8a, 10a, spring contact portions 8b, 10b, respectively.
Notch 8 that can contact stopper 5c of barrier support frame 5
c and 10c.
【0020】このバリア8,10は、それぞれバリア支
持枠5のバリア支持ピン5bに支持穴8a,10aを嵌
入させ、光軸Oとの直交平面内で回転可能な状態で取り
付けられる。また、バリア支持枠5のバネ支持ピン5d
に装着されたトーションバネのバリア付勢バネ9,11
の一端をバリア8,10のバネ当接部8b,10bに当
接させ、バリア8,10をそれぞれ閉位置方向である時
計回りに付勢している。The barriers 8 and 10 are fitted in such a manner that the support holes 8a and 10a are fitted into the barrier support pins 5b of the barrier support frame 5 and are rotatable in a plane orthogonal to the optical axis O. Also, the spring support pins 5d of the barrier support frame 5
Barrier biasing springs 9 and 11 for torsion springs mounted on
Is made to abut against the spring contact portions 8b and 10b of the barriers 8 and 10, respectively, to urge the barriers 8 and 10 clockwise in the closed position direction.
【0021】なお、バリア8,10に対して作用する回
転付勢トルクとして、バリア駆動ピン7bを介して作用
する駆動環付勢バネ12によるバリア開方向の反時計回
りの付勢トルクは、バリア付勢バネ9,11による時計
回りの付勢トルクよりも大きいものとする。したがっ
て、バリア8,10は、駆動環7の回転に従動して回転
駆動されることになる。As the rotational urging torque acting on the barriers 8 and 10, the counterclockwise urging torque in the barrier opening direction by the driving ring urging spring 12 acting via the barrier driving pin 7b is equal to the barrier urging torque. It is assumed that it is larger than the clockwise urging torque by the urging springs 9 and 11. Therefore, the barriers 8 and 10 are driven to rotate following the rotation of the drive ring 7.
【0022】上記鏡筒前カバー6は、中央部にレンズ開
口6aを有しており、移動枠2の段部2eに嵌入させた
状態で固着して取り付けられ、上記バリア8,10、お
よび、バリア付勢バネ9,11を上記バリア支持枠5と
で狭持することにより光軸O方向を規制した状態で保持
する。The lens barrel front cover 6 has a lens opening 6a at the center, and is fixedly attached to the movable frame 2 while being fitted into the step 2e of the moving frame 2. The barriers 8, 10, and The barrier urging springs 9 and 11 are held in a state where the direction of the optical axis O is regulated by sandwiching the barrier urging springs 9 and 11 with the barrier support frame 5.
【0023】以上のように構成された本実施形態のレン
ズ鏡筒1の移動枠2の進退動作に伴うバリアの開閉駆動
について、図3,4等を用いて説明する。なお、図3
は、図2のA−A断面を示すバリア開閉動作図であり、
図4は、駆動環駆動ピンによる駆動環のカム部の従動状
態を示す側面図である。Referring to FIGS. 3 and 4, a description will be given of the opening / closing drive of the barrier associated with the forward / backward movement of the moving frame 2 of the lens barrel 1 configured as described above. Note that FIG.
3 is a barrier opening / closing operation diagram showing an AA cross section of FIG. 2;
FIG. 4 is a side view showing the driven state of the cam portion of the drive ring by the drive ring drive pin.
【0024】レンズ鏡筒1が収納状態にあるときは、移
動枠2が後方の収納位置に繰り込まれている。この状態
では、駆動環7も同様に繰り込まれ、図4に示すように
カム部7cが駆動環駆動ピン16に当接しており、駆動
環7は、バリアを閉鎖する位置に反時計回りに回転して
いる。すなわち、図3に示すように駆動環7の反時計回
りの回転によりバリア駆動ピン7bがバリア8,10の
底辺面からわずかに離れるので、バリア8,10は、バ
リアバネ9,11の付勢力で時計回りに回転して切り欠
き8c,10cがバリア支持枠5のストッパ5cに当接
し、レンズ開口5aを覆う閉位置(遮蔽位置)P8A,P
10A にある。When the lens barrel 1 is in the housed state, the moving frame 2 is retracted to the rear housed position. In this state, the drive ring 7 is similarly retracted, and the cam portion 7c is in contact with the drive ring drive pin 16 as shown in FIG. 4, and the drive ring 7 is moved counterclockwise to the position where the barrier is closed. It is spinning. That is, as shown in FIG. 3, the barrier driving pin 7 b is slightly separated from the bottom surfaces of the barriers 8 and 10 by the counterclockwise rotation of the driving ring 7, so that the barriers 8 and 10 are biased by the barrier springs 9 and 11. Rotating clockwise, the notches 8c and 10c abut against the stopper 5c of the barrier support frame 5 to close the lens openings 5a (closed positions) P8A and P8.
At 10A.
【0025】レンズ鏡筒1を撮影可能状態にセットする
には移動枠2を前方に繰り出す。その繰り出し動作に伴
って図4に示すように駆動環7のカム部7cも前方に移
動して駆動環駆動ピン16と離れるので、駆動環7が駆
動環付勢バネ12の付勢力により押さえ環4の外周で時
計回りに回転し、バリア駆動ピン7bがバリア支持枠5
の長穴5fの端部に当接する。その回転動作により駆動
環7のバリア駆動ピン7bがバリア付勢バネ9,11の
付勢力に抗してバリア8,10の底辺面を押圧し、バリ
ア8,10は、開放方向である反時計回りに駆動され
る。そして、第1レンズ3C前面より退避した開位置
(非遮蔽位置)P8B,P10B まで回転する。この状態で
レンズ鏡筒1は、撮影可能状態にセットされる。To set the lens barrel 1 in a photographable state, the moving frame 2 is extended forward. 4, the cam portion 7c of the driving ring 7 also moves forward and separates from the driving ring driving pin 16 as shown in FIG. 4, so that the driving ring 7 is pressed by the urging force of the driving ring urging spring 12. 4 rotates clockwise around the outer periphery of the barrier support frame 5.
Abuts the end of the long hole 5f. Due to the rotation, the barrier drive pin 7b of the drive ring 7 presses against the bottom surfaces of the barriers 8, 10 against the biasing force of the barrier biasing springs 9, 11, and the barriers 8, 10 are in the opening direction in the counterclockwise direction. Driven around. Then, it rotates to open positions (non-shielding positions) P8B and P10B retracted from the front surface of the first lens 3C. In this state, the lens barrel 1 is set in a photographable state.
【0026】レンズ鏡筒1を再度収納状態にする場合
は、移動枠2を後方に向けて収納位置まで繰り込ませ
る。この繰り込み動作で駆動環駆動ピン16により駆動
環7が反時計回りの回転駆動され、バリア8,10は、
バリア駆動ピン7bの押圧から解放されるので、バリア
付勢バネ9,11の付勢力により図3に示す閉位置P8
A,P10A まで回転する。When the lens barrel 1 is to be stored again, the moving frame 2 is moved backward to the storage position. In this retraction operation, the drive ring 7 is driven to rotate counterclockwise by the drive ring drive pin 16, and the barriers 8 and 10
Since the pressing force of the barrier drive pin 7b is released, the urging force of the barrier urging springs 9 and 11 causes the closing position P8 shown in FIG.
A, rotate to P10A.
【0027】上述した第1の実施形態のレンズ鏡筒1の
バリア装置によると、移動枠2の進退移動に連動してバ
リア8,10を自動的にレンズ前面を覆う閉位置と、退
避した開位置に駆動させることができ、使い勝手がよく
なる。According to the barrier device for the lens barrel 1 of the first embodiment described above, the barriers 8 and 10 are automatically closed in response to the forward and backward movement of the moving frame 2 and the closed position where the front surface of the lens is retracted. It can be driven to a position, improving usability.
【0028】また、上記レンズ鏡筒1ではバリア支持枠
5のフランジの肉厚を薄くして駆動環7のバリア駆動ピ
ン7bを短くすることができるのでバリア駆動ピン7b
の倒れや変形が生じることがなく、バリアの高精度の開
閉動作が得られる。In the lens barrel 1, since the thickness of the flange of the barrier support frame 5 can be reduced to shorten the barrier drive pin 7b of the drive ring 7, the barrier drive pin 7b
The barrier does not collapse or deform, and the barrier can be opened and closed with high accuracy.
【0029】上述のようにバリア装置の各部材を光軸O
方向最小スペースに収納できる。また、光軸O直交方向
についても図2に示すように第1レンズ3A前面の極め
て近傍にバリア支持枠5のレンズ開口5aを設けている
ことからバリア装置の光軸Oと直交方向の配設スペース
を小さくできる。As described above, each member of the barrier device is connected to the optical axis O.
Can be stored in the minimum space in the direction. In the direction orthogonal to the optical axis O, as shown in FIG. 2, the lens opening 5a of the barrier support frame 5 is provided very close to the front surface of the first lens 3A. Space can be reduced.
【0030】図5の光路図は、フィルム面19に対して
最前に配置される第1レンズ3Aを通る撮影光の光路を
示している。バリアは、上記撮影光のうち、もっとも外
側の撮影光L0 を蹴ることがないように退避させる必要
がある。したがって、上述のように上記レンズ開口5a
が第1レンズ3Aに極めて近い位置にあるときのバリア
8,10の開口幅D1 は、上記レンズ開口がより遠い位
置にあるときのバリア8′,10′の開口幅D2 より狭
くなることから、上述したようにバリア8,10を適用
したバリア装置は、光軸Oと直交方向の配設スペースが
小さくなるといえる。The optical path diagram of FIG. 5 shows the optical path of the photographing light passing through the first lens 3A disposed at the forefront with respect to the film surface 19. The barrier needs to be retracted so as not to kick the outermost photographing light L0 of the photographing light. Therefore, as described above, the lens opening 5a
Is very close to the first lens 3A, the opening width D1 of the barriers 8, 10 is smaller than the opening width D2 of the barriers 8 ', 10' when the lens openings are farther away. As described above, in the barrier device to which the barriers 8 and 10 are applied, the arrangement space in the direction orthogonal to the optical axis O can be said to be small.
【0031】このように光軸O方向とともに光軸Oと直
交する方向に関してもバリア装置の占有スペースを小さ
くしてレンズ鏡筒1のコンパクト化や小型化が実現でき
る。As described above, the space occupied by the barrier device can be reduced in the direction orthogonal to the optical axis O as well as in the optical axis O, so that the lens barrel 1 can be made compact and compact.
【0032】さらに、駆動環7はその摺動嵌合部が押さ
え環4の外径部であるため小型形状にすることが可能で
ある。同時に上記摺動嵌合部が小さい径で嵌合している
ために駆動環7の摩擦負荷も小さくてすみ、スムーズな
動作が得られる。Further, the drive ring 7 can be made compact because the sliding fitting portion is the outer diameter of the press ring 4. At the same time, since the sliding fitting portion is fitted with a small diameter, the friction load on the drive ring 7 can be small, and a smooth operation can be obtained.
【0033】上記押さえ環4は、移動枠2のフランジ部
2cを貫通して延びた脚部4dの爪4cで移動枠2に係
合させ、その係合部を接着固定するので、塗布した接着
剤が駆動環7の嵌合面にまわって動作不良状態を引き起
こすことがない。The holding ring 4 is engaged with the moving frame 2 by the claw 4c of the leg 4d extending through the flange 2c of the moving frame 2, and the engaging portion is bonded and fixed. The agent does not move around the fitting surface of the drive ring 7 to cause a malfunction.
【0034】さらには上記バリア機構は、バリア等主要
構成部材が移動枠2より前方にあるのでバリア等の構成
部材を故障して取り換える場合は極めて簡単に取り換え
ができる。Further, since the main components such as the barrier are located in front of the movable frame 2, the barrier mechanism can be replaced very easily when the components such as the barrier are replaced due to failure.
【0035】上記第1の実施形態のレンズ鏡筒1の押さ
え環4は、駆動環7が回転可能に嵌入する外周面が単な
る全円周面で形成されていたが、その変形例として図6
の斜視図に示す押さえ環を提案できる。In the pressing ring 4 of the lens barrel 1 of the first embodiment, the outer peripheral surface into which the driving ring 7 is rotatably fitted is formed by a mere full circular surface. As a modification, FIG.
Can be proposed.
【0036】上記変形例の押さえ環18には、駆動環7
が回転可能に嵌入する外周面として円周軌跡を与える3
ヶ所の凸状嵌合部18bが設けられている。その他は、
押さえ環4と同様に開口18aをもつ円環部18eと、
光軸O方向の後方に向けて突出し、爪部18cをもつ3
つの脚部18d等が設けられている。The holding ring 18 of the above-described modified example includes the driving ring 7
Gives a circumferential trajectory as an outer peripheral surface into which the rotatably fits 3
A plurality of convex fitting portions 18b are provided. Others
An annular portion 18e having an opening 18a like the holding ring 4,
3 protruding rearward in the optical axis O direction and having a claw portion 18c
There are provided two legs 18d and the like.
【0037】この変形例の押さえ環18を適用した場
合、押さえ環18の駆動環との嵌合部を3つの凸状嵌合
部18bにしたことから押さえ環を樹脂成形により製作
する場合に駆動環7との嵌合ガタを金型上で簡単に調整
でき、嵌合精度を向上させることができる。したがっ
て、駆動環7がガタの少ない状態で押さえ環18に回転
可能に嵌合させ、精度のよいバリアの開閉動作が得られ
る。また、3つの凸状嵌合部18bを設ける位置に押さ
え環18の脚部18dが配置されているので駆動環7か
ら負荷を受けても押さえ環18のねじれ発生が少なく、
また、爪部18cでの接着剤の剥がれもなくなる。When the holding ring 18 of this modification is applied, the fitting portion of the holding ring 18 with the driving ring is made of three convex fitting portions 18b. The play of the fitting with the ring 7 can be easily adjusted on the mold, and the fitting accuracy can be improved. Therefore, the drive ring 7 is rotatably fitted to the holding ring 18 with little backlash, and a highly accurate barrier opening / closing operation can be obtained. Further, since the legs 18d of the holding ring 18 are arranged at the positions where the three convex fitting portions 18b are provided, even if a load is applied from the driving ring 7, the holding ring 18 is hardly twisted,
In addition, the adhesive is not peeled off at the claw portion 18c.
【0038】次に、本発明の第2の実施形態のバリア装
置が組み込まれたレンズ鏡筒について、図7のレンズ鏡
筒の縦断面図を用いて説明する。図7に示すように上記
レンズ鏡筒21は、被写体側から結像側に順次配設され
る第1レンズ3A′,第2レンズ3B,第3レンズ3C
と、上記各レンズを保持し、レンズ光軸に沿って進退駆
動される移動枠2と、バリア回転駆動用の駆動部材であ
る駆動環22と、バリアを支持するフランジ状部材であ
るバリア支持枠23と、鏡筒前カバー6と、レンズ前面
開閉用の上下2枚の薄板羽根状のバリア8,10と、固
定枠(図示せず)に保持され、駆動環駆動ピン16を支
持するピン支持板15(図示せず)と、上記移動枠2を
進退駆動する駆動機構部(図示せず)等を有してなる。
なお、上記第2,第3レンズ,3B,3Cと、移動枠2
と、バリア8,10と、鏡筒前カバー6は、前記第1の
実施形態に適用した部材と同一部材とする。Next, a lens barrel incorporating a barrier device according to a second embodiment of the present invention will be described with reference to a longitudinal sectional view of the lens barrel in FIG. As shown in FIG. 7, the lens barrel 21 includes a first lens 3A ', a second lens 3B, and a third lens 3C which are sequentially arranged from the subject side to the image forming side.
A moving frame 2 that holds the lenses and is driven forward and backward along the optical axis of the lens, a driving ring 22 that is a driving member for driving the rotation of the barrier, and a barrier supporting frame that is a flange-shaped member that supports the barrier 23, a front lens barrel cover 6, two upper and lower thin blade-shaped barriers 8 and 10 for opening and closing the front surface of the lens, and a pin support that is held by a fixed frame (not shown) and supports the drive ring drive pin 16. It has a plate 15 (not shown), a drive mechanism (not shown) for driving the moving frame 2 forward and backward, and the like.
The second and third lenses 3B and 3C and the moving frame 2
The barriers 8, 10 and the front lens barrel cover 6 are the same members as those applied to the first embodiment.
【0039】上記第1レンズ3A′は、移動枠2の前面
部に接着等により固着される。そして、第1レンズ3
A′の前面側露呈部分には駆動環22が回転可能に嵌入
する外周面3Aa′が設けられている。The first lens 3A 'is fixed to the front surface of the moving frame 2 by bonding or the like. And the first lens 3
An outer peripheral surface 3Aa 'on which the drive ring 22 is rotatably fitted is provided on the front side exposed portion of A'.
【0040】上記駆動環22は、第1レンズ3A′の外
周面3A′aに回転可能に嵌入する内周面22aを有す
る。その他は、前記駆動環7と同一形状とする。The drive ring 22 has an inner peripheral surface 22a rotatably fitted to the outer peripheral surface 3A'a of the first lens 3A '. Otherwise, the drive ring 7 has the same shape.
【0041】上記バリア支持枠23は、レンズ開口部2
3aを設けるバリア取り付け用の凸平面部22gと駆動
環押さえ平面部23hを有している。その他、バリア支
持ピンやバネ支持ピン等は、前記バリア支持枠5と同様
に設けられている。The barrier support frame 23 is provided with the lens opening 2
It has a convex flat portion 22g for mounting the barrier provided with 3a and a driving ring pressing flat portion 23h. In addition, barrier support pins, spring support pins, and the like are provided similarly to the barrier support frame 5.
【0042】上記駆動環22は、第1レンズ3A′の外
周面3A′aに回転可能に嵌入し、バリア支持枠23の
駆動環押さえ面23hで光軸O方向が規制されて摺動自
在に保持されている。The drive ring 22 is rotatably fitted on the outer peripheral surface 3A'a of the first lens 3A ', and is slidable with the direction of the optical axis O regulated by the drive ring pressing surface 23h of the barrier support frame 23. Is held.
【0043】以上のような構成を有する本実施形態のレ
ンズ鏡筒21における移動枠2の進退動作に伴うバリア
の開閉動作は、前記第1の実施形態のレンズ鏡筒1の場
合と同様であり、移動枠2の進退駆動に伴ってバリア
8,10の開閉駆動は行われる。The opening / closing operation of the barrier in the lens barrel 21 of the present embodiment having the above-described structure according to the movement of the moving frame 2 is similar to that of the lens barrel 1 of the first embodiment. The opening and closing driving of the barriers 8 and 10 is performed in accordance with the forward and backward driving of the moving frame 2.
【0044】上述した第2実施形態のレンズ鏡筒21の
バリア装置によれば、前記第1の実施形態の場合と同様
の効果を奏し、特にレンズを移動枠2に押さつけるため
の専用の押さえ環4を必要としないためにバリア8,1
0を第1レンズ3A′の極めて近い位置に配置可能とな
り、同時に駆動環22の外径も小さくすることができ
る。したがって、バリア装置の光軸O方向、および、光
軸Oと直交する方向の占有スペースを減らし、レンズ鏡
筒のさらなるコンパクト化が可能になり、また、組み立
ても容易になる。According to the barrier device for the lens barrel 21 of the second embodiment described above, the same effect as that of the first embodiment can be obtained, and in particular, a dedicated press for pressing the lens against the moving frame 2. Barriers 8, 1 because ring 4 is not required
0 can be arranged very close to the first lens 3A ', and at the same time, the outer diameter of the drive ring 22 can be reduced. Therefore, the space occupied by the barrier device in the optical axis O direction and the direction orthogonal to the optical axis O can be reduced, and the lens barrel can be made more compact, and the assembly becomes easier.
【0045】上述した本発明の実施の形態により、 (1)レンズ光軸に垂直な面内でレンズ枠に対し移動自
在にレンズ枠前部に設けられ、レンズの開口を遮蔽する
開口遮蔽位置と開口を遮蔽しない開口非遮蔽位置に移動
可能なバリア羽根と、少なくとも最前面のレンズ玉をレ
ンズ枠に固定保持する押さえ環と、上記押え環の外周に
嵌合し、レンズ光軸周りに回転することにより、外バリ
ア羽根を上記開口遮蔽位置と上記開口非遮蔽位置に移動
させる駆動環と、からなることを特徴とするバリア装置
を提案することができる。According to the above-described embodiment of the present invention, (1) an opening shielding position which is provided at the front of the lens frame so as to be movable with respect to the lens frame in a plane perpendicular to the lens optical axis, and which blocks the opening of the lens; A barrier blade that can be moved to an opening non-blocking position that does not block the opening, a holding ring that fixes and holds at least the frontmost lens ball to the lens frame, and is fitted around the holding ring and rotates around the lens optical axis. Accordingly, it is possible to propose a barrier device comprising a drive ring for moving the outer barrier blade to the above-mentioned opening shielding position and the above-mentioned opening non-shielding position.
【0046】(2) 上記押さえ環は、レンズ枠前面の
フランジ部に設けられた切り欠きを貫通して該フランジ
部の後ろに設けられた係合部に係合する脚部を持つこと
を特徴とする上記(1)項記載のバリア装置を提案する
ことができる。(2) The holding ring has a leg portion that penetrates a notch provided in a flange portion on the front surface of the lens frame and engages with an engagement portion provided behind the flange portion. The barrier device described in the above item (1) can be proposed.
【0047】(3)押さえ環の駆動環との嵌合部は、複
数箇所の凸面で形成されていることを特徴とする上記
(1)項記載のバリア装置を提案することができる。(3) The barrier device according to the above item (1), wherein the fitting portion of the press ring with the drive ring is formed of a plurality of convex surfaces.
【0048】(4)レンズ光軸に垂直な面内でレンズ枠
に対し移動自在にレンズ枠前部に設けられ、レンズの開
口を遮蔽する開口遮蔽位置と開口を遮蔽しない開口非遮
蔽位置に退避可能なバリア羽根と、少なくとも最前面に
配置され、外周に嵌合部を持ち、レンズ枠に固定された
レンズと、該レンズの嵌合部に嵌合し、レンズ光軸周り
に回転することにより、該バリア羽根を上記開口遮蔽位
置と開口非遮蔽位置に移動させる駆動環と、からなるこ
とを特徴とするバリア装置を提案することができる。(4) Provided at the front of the lens frame so as to be movable with respect to the lens frame in a plane perpendicular to the lens optical axis, and retracted to an opening blocking position for blocking the opening of the lens and an opening non-blocking position for not blocking the opening. A possible barrier blade, at least disposed on the frontmost surface, having a fitting portion on the outer periphery, a lens fixed to the lens frame, fitted into the fitting portion of the lens, and rotated around the lens optical axis And a driving ring for moving the barrier blade to the above-mentioned opening shielding position and the opening non-shielding position.
【0049】(5) 上記バリア羽根は、上記レンズ枠
前部に固定されたフランジ状部材に設けられたボスに回
転自在に嵌合し、バネ部材により、上記バリア羽根が開
口遮蔽位置もしくは開口非遮蔽位置に移動するように付
勢されていることを特徴とする上記(1)、または、
(2)項に記載のバリア装置を提案することができる。(5) The barrier blade is rotatably fitted to a boss provided on a flange-like member fixed to the front portion of the lens frame. (1) or being biased to move to the shielding position, or
The barrier device described in the item (2) can be proposed.
【0050】[0050]
【発明の効果】上述のように本発明によれば、バリアお
よびバリア駆動部の構造が簡単で占有スペースも小さ
く、バリアが組み込まれるレンズ鏡筒の小型化が可能で
あり、しかも、バリアの交換も簡単に行えるバリア装置
を提供することができる。As described above, according to the present invention, the structure of the barrier and the barrier drive section is simple, the occupied space is small, the lens barrel in which the barrier is incorporated can be downsized, and the barrier can be replaced. A barrier device that can be easily performed.
【図1】本発明の第1の実施形態であるバリア装置が組
み込まれたレンズ鏡筒の分解斜視図。FIG. 1 is an exploded perspective view of a lens barrel in which a barrier device according to a first embodiment of the present invention is incorporated.
【図2】上記第1の実施形態のレンズ鏡筒の縦断面図。FIG. 2 is a longitudinal sectional view of the lens barrel according to the first embodiment.
【図3】図2のA−A断面図であって、バリアの開閉動
作状態を示す。FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2, showing an opening / closing operation state of a barrier.
【図4】上記第1の実施形態のレンズ鏡筒に適用される
駆動環のカム部の駆動環駆動ピンとの従動状態を示す側
面図。FIG. 4 is a side view showing a driven state of a cam portion of a drive ring applied to the lens barrel of the first embodiment with a drive ring drive pin.
【図5】上記第1の実施形態のレンズ鏡筒における撮影
光の光路図。FIG. 5 is an optical path diagram of photographing light in the lens barrel according to the first embodiment.
【図6】上記第1の実施形態のレンズ鏡筒に適用される
押さえ環の変形例の斜視図。FIG. 6 is a perspective view of a modified example of a holding ring applied to the lens barrel according to the first embodiment.
【図7】本発明の第2の実施形態のバリア装置が組み込
まれたレンズ鏡筒の縦断面図。FIG. 7 is a longitudinal sectional view of a lens barrel in which a barrier device according to a second embodiment of the present invention is incorporated.
3A,3A′……第1レンズ(レンズ鏡筒前面にあるレ
ンズ) 4,18 ……押さえ環(押さえ部材) 7,22 ……駆動環(駆動部材) 8,10 ……バリア P8A,P10A ……バリア閉位置(レンズを覆う閉じ位
置) P8B,P10B ……バリア開位置(レンズから退避した開
位置)3A, 3A ': First lens (lens in front of lens barrel) 4, 18 ... Pressing ring (pressing member) 7, 22: Drive ring (driving member) 8, 10: Barrier P8A, P10A … Barrier closed position (closed position covering the lens) P8B, P10B …… Barrier open position (opened position retracted from the lens)
Claims (3)
面内で移動して上記レンズを覆う閉じ位置と上記レンズ
前面から待避した開位置とに移動するバリアと、 上記レンズを上記レンズ鏡筒に押さえる押さえ部材と、 上記バリアを上記は開閉駆動するために上記押さえ部材
に嵌合して回転する駆動部材と、 を有することを特徴とするバリア装置。1. A lens in front of a lens barrel, a closed position that is located in front of the lens and moves in a plane perpendicular to the optical axis of the lens to cover the lens, and an open position that is retracted from the front of the lens. And a pressing member that presses the lens against the lens barrel; and a driving member that fits and rotates with the pressing member to drive the barrier to open and close. Barrier device.
面内で移動して上記レンズを覆う閉じ位置と上記レンズ
前面から待避した開位置とに移動するバリアと、 上記バリアを上記開閉駆動するため上記レンズに嵌合し
て回転する駆動部材と、 を有することを特徴とするバリア装置。2. A lens located in front of a lens barrel, a closed position located in front of the lens and moved in a plane perpendicular to the optical axis of the lens to cover the lens, and an open position retracted from the front of the lens. And a driving member that fits and rotates with the lens to drive the barrier to open and close.
ンズはその光軸方向に移動可能であることを特徴とする
バリア装置。3. The barrier device according to claim 1, wherein the lens of the barrier device according to claim 1 is movable in an optical axis direction.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP2000225655A JP4468556B2 (en) | 2000-07-26 | 2000-07-26 | Barrier device |
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JP2000225655A JP4468556B2 (en) | 2000-07-26 | 2000-07-26 | Barrier device |
Publications (2)
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JP2002040516A true JP2002040516A (en) | 2002-02-06 |
JP4468556B2 JP4468556B2 (en) | 2010-05-26 |
Family
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JP2000225655A Expired - Fee Related JP4468556B2 (en) | 2000-07-26 | 2000-07-26 | Barrier device |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006308703A (en) * | 2005-04-27 | 2006-11-09 | Nidec Copal Corp | Lens barrier device |
JP2007322872A (en) * | 2006-06-02 | 2007-12-13 | Victor Co Of Japan Ltd | Lens barrier device |
JP2009037129A (en) * | 2007-08-03 | 2009-02-19 | Canon Inc | Lens barrel and imaging apparatus |
JP2009042640A (en) * | 2007-08-10 | 2009-02-26 | Canon Inc | Barrier mechanism and camera |
JP2012163698A (en) * | 2011-02-04 | 2012-08-30 | Ricoh Co Ltd | Barrier mechanism and camera equipped with barrier mechanism |
-
2000
- 2000-07-26 JP JP2000225655A patent/JP4468556B2/en not_active Expired - Fee Related
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006308703A (en) * | 2005-04-27 | 2006-11-09 | Nidec Copal Corp | Lens barrier device |
JP2007322872A (en) * | 2006-06-02 | 2007-12-13 | Victor Co Of Japan Ltd | Lens barrier device |
JP2009037129A (en) * | 2007-08-03 | 2009-02-19 | Canon Inc | Lens barrel and imaging apparatus |
JP2009042640A (en) * | 2007-08-10 | 2009-02-26 | Canon Inc | Barrier mechanism and camera |
JP2012163698A (en) * | 2011-02-04 | 2012-08-30 | Ricoh Co Ltd | Barrier mechanism and camera equipped with barrier mechanism |
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Publication number | Publication date |
---|---|
JP4468556B2 (en) | 2010-05-26 |
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