JP2008287127A

JP2008287127A - Lens barrier device

Info

Publication number: JP2008287127A
Application number: JP2007133684A
Authority: JP
Inventors: Hiroshi Fujii; 寛藤井; Yoshio Kusui; 嘉雄楠井; Hiroshi Saito; 浩齊藤; Mitsuru Harada; 充原田
Original assignee: Sony Corp
Current assignee: Sony Corp
Priority date: 2007-05-21
Filing date: 2007-05-21
Publication date: 2008-11-27

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a lens barrier device by independently moving a plurality of barrier blades. <P>SOLUTION: In the lens barrier device 1, the first and second barrier blades 8 and 9 are rotatably fitted to the first shaft 6 disposed on a frame body 5, in which an opening 4 is formed in front of the lens 3 of a lens barrel 2. The third and fourth barrier blades 10 and 11 are rotatably fitted to the second shaft 7. The first and second springs 12 and 13 press the first to fourth barrier blades 8 to 11 in the direction in which the opening 4 is closed. When a rotation ring 16 that has the first and second cam engagement projections 14 and 15 is rotated, the first cam engagement projection 14 pushes cam faces 17 and 18 formed on the roots of the first and second barrier blades 8 and 9, and the second cam engagement projection 15 presses cam faces 17 to 20 formed on the roots of the third and fourth barrier blades 10 and 11, thereby moving the first to fourth barrier blades 8 and 11 to their closing positions. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、デジタルスチルカメラ、デジタルビデオカメラ等の撮像装置において、非撮影時に撮像レンズの前方を覆って、上記撮像レンズを保護するレンズバリヤ装置に関するものである。 The present invention relates to a lens barrier device that covers the front of an imaging lens and protects the imaging lens during non-shooting in an imaging device such as a digital still camera or a digital video camera.

レンズバリヤ装置として、複数のバリヤ羽根を使用し、これらバリヤ羽根をバネで開口部を閉じた状態に維持すると共に、回動リングを回動させることにより上記バネの力に抗して上記複数のバリヤ羽根を回動させて上記開口部を開くようにしたものが知られている。（例えば、特許文献１参照）
特許文献１のレンズバリヤ装置においては、1枚のバリヤ羽根と他のバリヤ羽根に第1連係部と第２連係部を設け、上記回動リングにより1枚のバリヤ羽根を上記開口部を閉じる方向に回動させると、上記第1連係部によって他のバリヤ羽根も連動移動されて上記開口部を閉じる。また、上記回動リングにより1枚のバリヤ羽根を上記開口部を開く方向に回動させると、上記第２連係部によって他のバリヤ羽根も連動移動されて上記開口部を開くようになっている。
特開平７−１５２０６６号公報 As the lens barrier device, a plurality of barrier blades are used, and the barrier blades are maintained in a state in which the openings are closed by springs, and the rotation ring is rotated to resist the force of the springs. A device in which a barrier blade is rotated to open the opening is known. (For example, see Patent Document 1)
In the lens barrier device of Patent Document 1, a first linking portion and a second linking portion are provided on one barrier blade and the other barrier blade, and one barrier blade is closed in the opening by the rotating ring. When the first pivoting portion is rotated, other barrier blades are also moved in conjunction with the first linkage portion to close the opening portion. Further, when one barrier blade is rotated in the opening direction by the rotating ring, the other barrier blade is also moved in conjunction with the second linkage portion to open the opening portion. .
JP-A-7-152066

ところで、上記従来のレンズバリヤ装置は、上記第1連係部と第２連係部により、1枚のバリヤ羽根に連動させて他のバリヤ羽根を移動させる構成になっているために、上記第1連係部と第２連係部の存在によりバリヤ羽根の構造が複雑になり、コストも高くなるという問題点があった。 By the way, since the conventional lens barrier device is configured to move the other barrier blade in conjunction with one barrier blade by the first linkage portion and the second linkage portion, the first linkage portion. Due to the presence of the portion and the second linkage portion, there is a problem that the structure of the barrier blade is complicated and the cost is increased.

本発明の目的は、1枚のバリヤ羽根を上記開口部を開く方向に回動させたときに他のバリヤ羽根を連動させる第２連係部を無くして、バリヤ羽根の構造を簡素化することにある。 An object of the present invention is to simplify the structure of a barrier blade by eliminating the second linkage portion that interlocks another barrier blade when one barrier blade is rotated in the direction to open the opening. is there.

本発明は、レンズ鏡筒のレンズの前方に開口部を形成する枠体と、上記枠体に上記開口部を介して対抗する位置に配置された第１，第２の軸に回動自在に取り付けられて上記開口部を開閉する複数のバリヤ羽根と、上記複数のバリヤ羽根を閉方向に付勢している第１，第２のバネと、上記枠体に回動可能に組み付けられていて一方向に回動させることにより第１，第２のカム係合突起で上記複数のバリヤ羽根のカム面を押圧して複数のバリヤ羽根を開方向に回動させる回動リングと、を備えたレンズバリヤ装置において、
上記複数のバリヤ羽根を、上記第1の軸に回動可能に取り付けられていて上記開口部の半部の内，外側を開閉する第1，第２のバリヤ羽根と、上記第２の軸に回動可能に取り付けられていて上記開口部の残りの半部の内，外側を開閉する第３，第４のバリヤ羽根と、で構成すると共に、上記複数のバリヤ羽根のカム面を、上記軸の根元部分の内側面に形成した。 According to the present invention, a frame that forms an opening in front of a lens of a lens barrel, and first and second shafts that are disposed at positions facing the frame through the opening are rotatable. A plurality of barrier blades that are attached to open and close the opening, first and second springs that bias the plurality of barrier blades in the closing direction, and the frame body are rotatably assembled. A rotating ring for rotating the plurality of barrier blades in the opening direction by pressing the cam surfaces of the plurality of barrier blades with the first and second cam engaging projections by rotating in one direction; In the lens barrier device,
The plurality of barrier blades are pivotally attached to the first shaft and open and close the inner and outer sides of the half of the opening, and the second shaft. The third and fourth barrier blades that are pivotably attached and open and close the inside and outside of the remaining half of the opening, and the cam surfaces of the plurality of barrier blades It was formed on the inner surface of the root part of.

上記回動リングに設けたカム係合突起で個々のバリヤ羽根のカム面を押圧して上記複数のバリヤ羽根を開くので、上記従来のレンズバリヤ装置の第２連係部に相当するものは不必要になりその分、バリヤ羽根の構造を簡素化することができる。また、上記軸の根元部分の内側面に形成したので、カム係合突起の少ない移動でバリヤ羽根の開閉を行うことができる。 Since the plurality of barrier blades are opened by pressing the cam surfaces of the individual barrier blades with the cam engaging projections provided on the rotating ring, the one corresponding to the second linkage portion of the conventional lens barrier device is unnecessary. Therefore, the structure of the barrier blade can be simplified. In addition, since it is formed on the inner side surface of the base portion of the shaft, the barrier blade can be opened and closed with a small movement of the cam engagement protrusion.

図1はレンズバリヤ装置の使用状態を示し、開口部を閉じた状態の斜視図、図２は開口部を開いた状態の斜視図、図３はレンズバリヤ装置の斜視図、図４はレンズバリヤ装置の分解斜視図である。 FIG. 1 is a perspective view of the lens barrier device in use, with the opening being closed, FIG. 2 is a perspective view with the opening open, FIG. 3 is a perspective view of the lens barrier device, and FIG. 4 is a lens barrier. It is a disassembled perspective view of an apparatus.

図１，図２に示すように、レンズバリヤ装置１は、レンズ鏡筒２の先端部にレンズ３を覆うように取り付けられている。 As shown in FIGS. 1 and 2, the lens barrier device 1 is attached to the tip of the lens barrel 2 so as to cover the lens 3.

レンズバリヤ装置１は、レンズ３の前方に開口部４を備えていて、撮影時には上記開口部４を開いて撮影する。また、非撮影時等においては上記開口部４を閉じてレンズ３を保護する。 The lens barrier device 1 has an opening 4 in front of the lens 3 and opens the opening 4 for shooting. Further, when not photographing, the lens opening 3 is closed to protect the lens 3.

図３に示すように、上記レンズバリヤ装置１は、上記開口部４を形成する枠体５と、上記枠体５に第1，第２の軸６，７で回動自在に取り付けられていて上記開口部４を開閉する第1〜第４の複数のバリヤ羽根８〜１１と、上記第１，第２のバリヤ羽根８，９を閉方向に付勢している第1の捩じりコイルバネ１２と、上記第３，第４のバリヤ羽根１０，１１を閉方向に付勢している第２の捩じりコイルバネ１３と、上記枠体５に回動可能に組み付けられていて一方向に回動させることにより上記バネ１２，１３に抗して第1，第２のカム係合突起１４，１５（図４参照）で上記複数のバリヤ羽根８〜１１を開方向に回動させる回動リング１６（図４参照）と、を備えている。 As shown in FIG. 3, the lens barrier device 1 is attached to a frame body 5 that forms the opening 4 and to the frame body 5 so as to be rotatable by first and second shafts 6 and 7. A plurality of first to fourth barrier blades 8 to 11 for opening and closing the opening 4 and a first torsion coil spring urging the first and second barrier blades 8 and 9 in the closing direction. 12, a second torsion coil spring 13 that urges the third and fourth barrier blades 10, 11 in the closing direction, and the frame 5 are rotatably assembled in one direction. By rotating, the plurality of barrier blades 8 to 11 are rotated in the opening direction by the first and second cam engaging protrusions 14 and 15 (see FIG. 4) against the springs 12 and 13. And a ring 16 (see FIG. 4).

図４に示すように、上記複数のバリヤ羽根８〜１１は、上記回動リング１６を一方向に回動させることにより上記カム係合突起１４，１５で押圧されてこれら複数のバリヤ羽根８〜１１を開方向に回動させるカム面１７〜２０を備えている。 As shown in FIG. 4, the plurality of barrier blades 8 to 11 are pressed by the cam engaging protrusions 14 and 15 by rotating the rotating ring 16 in one direction, and the plurality of barrier blades 8 to 11 are pressed. Cam surfaces 17 to 20 are provided for rotating 11 in the opening direction.

上記枠体５は、上記レンズ３の前方に配置されて上記開口部４を形成する第1の開口部形成孔２１を有するベースプレート２２と、上記ベースプレート２２の前方に配置されて上記ベースプレート２２の第1の開口部形成孔２１と共に上記開口部４を形成する第２の開口部形成孔２３を有するフロントプレート２４と、で構成されている。上記ベースプレート２２の背面側には上記回動リング１６と、該回動リング１６の背面側を覆うバックプレート２５が配置される。 The frame 5 is disposed in front of the lens 3 and has a base plate 22 having a first opening forming hole 21 that forms the opening 4, and the frame 5 is disposed in front of the base plate 22 and the first of the base plate 22. And a front plate 24 having a second opening forming hole 23 that forms the opening 4 together with one opening forming hole 21. On the back side of the base plate 22, the rotating ring 16 and a back plate 25 covering the back side of the rotating ring 16 are arranged.

上記ベースプレート２２は、上記フロントプレート２４に対向する面と反対側の面に上記回動リング１６を回動可能に組み付けるリング状の溝３１を備え、該リング状の溝３１に底面に、上記第1，第２のカム係合突起１４，１５を挿入してその先端部を上記フロントプレート２４側に突出させる第1，第２の円弧状の孔３２，３３を備えている。これら第1の円弧状の孔３２と第２の円弧状の孔３３は、上記第1の開口部形成孔２１を介して対称位置に設けられている。また、上記ベースプレート２２は、下端部にギヤボックス３４を備えている。 The base plate 22 includes a ring-shaped groove 31 for rotatably mounting the rotating ring 16 on a surface opposite to the surface facing the front plate 24. The base plate 22 has a ring-shaped groove 31 on the bottom surface. First and second cam engagement protrusions 14 and 15 are inserted, and first and second arc-shaped holes 32 and 33 are provided for projecting the tip portions toward the front plate 24 side. The first arc-shaped hole 32 and the second arc-shaped hole 33 are provided at symmetrical positions via the first opening forming hole 21. The base plate 22 includes a gear box 34 at the lower end.

図５に拡大して示すように、上記フロントプレート２４は、上記ベースプレート２２に対向する面の上記第２の開口部形成孔２３を介して対向する位置に上記第1，第２の軸６，7を備えている。上記第1の軸６の近傍には上記第1の捩じりコイルバネ１２を取り付ける第１のバネ取付部４１と、該第1の捩じりコイルバネ１２の一端部を係止する第1のバネ係止部４２と、上記ベースプレート２２等をネジで結合するためのボス部４３が設けられている。また、上記第２の軸７の近傍には上記第２の捩じりコイルバネ１３を取り付ける第２のバネ取付部４４と、該第２の捩じりコイルバネ１３の一端部を係止する第２のバネ係止部４５と、上記ベースプレート２２等をネジで結合するためのボス部４６が設けられている。なお、２点鎖線で示すように、上記第１の軸６には、上記第１のバリヤ羽根８の一端部が回動可能に取り付けられると共に、該第１のバリヤ羽根８上に重ね合わせるようにして第２のバリヤ羽根９の一端部が回動可能に取り付けられている。また、上記第２の軸７には、上記第３のバリヤ羽根１０の一端部が回動可能に取り付けられ、該第３のバリヤ羽根１０上に重ね合わせるようにして第４のバリヤ羽根１１の一端部が回動可能に取り付けられる。
図４に示すように、上記第１のバリヤ羽根８は、略円弧状に形成されていて一端側に軸挿入孔５１を備え、他端側に第１の係合部５２を備え、上記軸挿入孔５１と第１の係合部５２の間に第２の係合部５３を備えている。上記第１のバリヤ羽根８は、上記軸挿入孔５１に上記第１の軸６を挿入することにより該第１の軸６を中心にして回動可能に組み付けられる。上記第３のバリヤ羽根１０は、上記第１のバリヤ羽根８と略同じに形成されていて上記第２の軸７に回動可能に組み付けられる。
また、上記第２のバリヤ羽根９は、略円弧状に形成されていて一端側に軸挿入孔５４およびバネ係止部５５を備え、他端側に第３の係合部５６を備えている。上記第２のバリヤ羽根９は、上記軸挿入孔５４に上記第１の軸６を挿入することにより上記第１のバリヤ羽根８上に重ね合わせた状態で上記第１の軸６に回動可能に組み付けられている。上記第４のバリヤ羽根１１は、上記第２のバリヤ羽根９と略同じに形成されていて上記第３のバリヤ羽根１０上に重ね合わせた状態で上記第２の軸７に回動可能に組み付けられる。
図６〜図８は第1〜第４の複数のバリヤ羽根８〜１１および上記第1，第２の捩じりコイルバネ１２，１３を上記フロントプレート２４に組み付けた状態を示す。上述したように第１のバリヤ羽根８と第２のバリヤ羽根９は、互いに重ね合わせた状態で第１の軸６に回動可能に組み付けられると共に、第３のバリヤ羽根１０と第４のバリヤ羽根１１は、互いに重ね合わせた状態で第２の軸７に回動可能に組み付けられる。
第１の捩じりコイルバネ１２は、中央のコイル部１２aが第１のバネ取付部４１に取り付けられていて、一端部が第１のバネ係止部４２に係止され、他端部が第２のバリヤ羽根９のバネ係止部５５に係止されて、上記第２のバリヤ羽根９に上記第１の軸６を中心に反時計方向の回動力を付与している。
上記第１の捩じりコイルバネ１２により反時計方向の回動力を付与された第２のバリヤ羽根９は、先端の第３の係合部５６が第１のバリヤ羽根８に設けた第１の係合部５２に係合し、該第２の係合部５２をフロントプレート２４に設けた第１のストッパ５７に押し付けて、上記第１のバリヤ羽根８と第２のバリヤ羽根９とで、上記開口部４の略上半部を塞いだ状態に維持する。
第２の捩じりコイルバネ１３は、中央のコイル部１３aが第２のバネ取付部４４に取り付けられていて、一端部が第２のバネ係止部４５に係止され、他端部が第４のバリヤ羽根１１のバネ係止部５５に係止されて上記第４のバリヤ羽根１１に上記第２の軸７を中心に反時計方向の回動力を付与している。
上記第２の捩じりコイルバネ１３により反時計方向の回動力を付与された第４のバリヤ羽根１１は、先端の第３の係合部５６が第３のバリヤ羽根１０に設けた第１の係合部５２に係合し、該第１の係合部５２をフロントプレート２４に設けた第２のストッパ５８に押し付けて、上記第３のバリヤ羽根１０と第４のバリヤ羽根１１とで、上記開口部４の略下半部を塞いだ状態に維持する。
図４に示すように、上記回動リング１６は、上記ベースプレート２２と対向する面に第1，第２のカム係合突起１４，１５を備え、下端に円弧状のギヤ６１とセンサ遮光部６２を備えている。上記回動リング１６を上記ベースプレート２２に設けたリング状の溝３１内に回動可能に組み付けると、図９，図１０に示すように、上記第1のカム係合突起１４の先端部は、上記リング状の溝３１に底面に設けた第1の円弧状の孔３２から抜け出て、上記第1，第２のバリヤ羽根８，９のカム面１７，１８に係合可能な位置まで突出する。また、上記第２のカム係合突起１５の先端部は、上記リング状の溝３１に底面に設けた第２の円弧状の孔３３から抜け出て、上記第３，第４のバリヤ羽根１０，１１のカム面１９，２０に係合可能な位置まで突出する。そして、上記回動リング１６を時計方向（図１０の矢印方向）に回動させると、上記第1，第２のバリヤ羽根８，９は、上記第1のカム係合突起１４で上記カム面１７，１８が押圧されて開方向に移動し、上記第３，第４のバリヤ羽根１０，１１は、上記第２のカム係合突起１５で上記カム面１９，２０が押圧されて開方向に移動し、図１１に示す半開状態を経て、図１２に示す全開状態になる。
図１３，図１４に拡大して示すように、上記第１のバリヤ羽根８のカム面１７と第２のバリヤ羽根９のカム面１８は、軸６側の端部においては第1のカム係合突起１４の移動方向に対して略同じ傾斜角度に形成されていて、第1のカム係合突起１４により押されて略同じ量回動するようになっている。
上記第１のバリヤ羽根８のカム面１７と第２のバリヤ羽根９のカム面１８は、途中から上記第1のカム係合突起１４の移動方向に対する傾斜角度を変えて形成されている。具体的には、上記第２のバリヤ羽根９のカム面１８の途中からの傾斜角度θ１は、上記第１のバリヤ羽根８のカム面１７の途中からの傾斜角度θ２よりも大に形成されている。従って、上記第1のカム係合突起１４が移動してきて、上記第１のバリヤ羽根８のカム面１７と第２のバリヤ羽根９のカム面１８の同じ傾斜角度部分を押圧したときには、図１１，図１５，図１６に示すように、第1のバリヤ羽根８と第２のバリヤ羽根９は、略同じ量回動して所謂半開き状態になる。そして、更に回動リング１６を回動させると、上記傾斜角度の相違により第２，第４のバリヤ羽根９，１１は、第１，第３のバリヤ羽根８，１０よりも大きな回動角度で回動していって、最終的に、図１２，図１７，図１８に示すように、
第1のバリヤ羽根８と第２のバリヤ羽根９は、上記開口部を全開状態にする。なお、図示は省略したが、上記第３，第４のバリヤ羽根１０，１１の上記第２のカム係合突起１５の移動方向に対する傾斜角度も上記第1，第２のバリヤ羽根８，９の傾斜角度と同様に形成されて、これら第1，第２のバリヤ羽根８，９と同期して移動する。 As shown in an enlarged view in FIG. 5, the front plate 24 has the first and second shafts 6 at positions facing the base plate 22 via the second opening forming hole 23. 7 is provided. In the vicinity of the first shaft 6, a first spring mounting portion 41 for mounting the first torsion coil spring 12 and a first spring for locking one end of the first torsion coil spring 12. A boss portion 43 for connecting the locking portion 42 and the base plate 22 and the like with screws is provided. Also, a second spring mounting portion 44 for mounting the second torsion coil spring 13 in the vicinity of the second shaft 7 and a second end for locking one end of the second torsion coil spring 13. Are provided with a boss portion 46 for connecting the base plate 22 and the like with screws. As indicated by a two-dot chain line, one end portion of the first barrier blade 8 is rotatably attached to the first shaft 6 and is superposed on the first barrier blade 8. Thus, one end of the second barrier blade 9 is rotatably attached. Further, one end of the third barrier blade 10 is rotatably attached to the second shaft 7, and the fourth barrier blade 11 is overlapped on the third barrier blade 10. One end is pivotally attached.
As shown in FIG. 4, the first barrier blade 8 is formed in a substantially arc shape, includes a shaft insertion hole 51 on one end side, and includes a first engagement portion 52 on the other end side, and the shaft A second engagement portion 53 is provided between the insertion hole 51 and the first engagement portion 52. The first barrier blade 8 is assembled so as to be rotatable around the first shaft 6 by inserting the first shaft 6 into the shaft insertion hole 51. The third barrier blade 10 is formed substantially the same as the first barrier blade 8 and is rotatably assembled to the second shaft 7.
The second barrier blade 9 is formed in a substantially arc shape and includes a shaft insertion hole 54 and a spring locking portion 55 on one end side and a third engagement portion 56 on the other end side. . The second barrier blade 9 can be rotated to the first shaft 6 in a state of being superimposed on the first barrier blade 8 by inserting the first shaft 6 into the shaft insertion hole 54. It is assembled to. The fourth barrier blade 11 is formed substantially the same as the second barrier blade 9 and is rotatably assembled to the second shaft 7 in a state of being superimposed on the third barrier blade 10. It is done.
6 to 8 show a state in which the first to fourth barrier blades 8 to 11 and the first and second torsion coil springs 12 and 13 are assembled to the front plate 24. As described above, the first barrier blade 8 and the second barrier blade 9 are rotatably assembled to the first shaft 6 in a state of being overlapped with each other, and the third barrier blade 10 and the fourth barrier blade are also assembled. The blade | wing 11 is assembled | attached to the 2nd axis | shaft 7 so that rotation is possible in the state piled up mutually.
The first torsion coil spring 12 has a central coil portion 12 a attached to the first spring attachment portion 41, one end portion engaged with the first spring engagement portion 42, and the other end portion of the first torsion coil spring 12. The second barrier blade 9 is locked by a spring locking portion 55 to apply a counterclockwise turning force about the first shaft 6 to the second barrier blade 9.
The second barrier blade 9 to which the counterclockwise turning force is applied by the first torsion coil spring 12 has a first engagement portion 56 at the tip provided on the first barrier blade 8. Engaging with the engaging portion 52, pressing the second engaging portion 52 against the first stopper 57 provided on the front plate 24, the first barrier blade 8 and the second barrier blade 9 The substantially upper half of the opening 4 is kept closed.
The second torsion coil spring 13 has a central coil portion 13 a attached to the second spring attachment portion 44, one end portion engaged with the second spring engagement portion 45, and the other end portion of the second torsion coil spring 13. The fourth barrier blade 11 is locked by a spring locking portion 55 to apply a counterclockwise turning force about the second shaft 7 to the fourth barrier blade 11.
The fourth barrier blade 11 to which the counterclockwise turning force is applied by the second torsion coil spring 13 is the first barrier portion 10 provided with the third engaging portion 56 at the tip. Engaging with the engaging portion 52, pressing the first engaging portion 52 against the second stopper 58 provided on the front plate 24, the third barrier blade 10 and the fourth barrier blade 11 The substantially lower half of the opening 4 is kept closed.
As shown in FIG. 4, the rotating ring 16 includes first and second cam engaging protrusions 14 and 15 on a surface facing the base plate 22, and an arcuate gear 61 and a sensor light-shielding portion 62 at the lower end. It has. When the rotating ring 16 is rotatably assembled in a ring-shaped groove 31 provided in the base plate 22, as shown in FIGS. 9 and 10, the tip of the first cam engaging protrusion 14 is The ring-shaped groove 31 protrudes from a first arc-shaped hole 32 provided on the bottom surface to a position where it can engage with the cam surfaces 17 and 18 of the first and second barrier blades 8 and 9. . Further, the tip end portion of the second cam engagement projection 15 is pulled out from a second arc-shaped hole 33 provided on the bottom surface of the ring-shaped groove 31, and the third and fourth barrier blades 10, It protrudes to a position where it can engage with the 11 cam surfaces 19 and 20. When the rotating ring 16 is rotated clockwise (in the direction of the arrow in FIG. 10), the first and second barrier blades 8 and 9 are moved to the cam surface by the first cam engaging protrusion 14. 17 and 18 are pressed to move in the opening direction, and the third and fourth barrier blades 10 and 11 are moved in the opening direction by the cam surfaces 19 and 20 being pressed by the second cam engagement protrusion 15. It moves to the fully opened state shown in FIG. 12 through the half-opened state shown in FIG.
As shown in enlarged views in FIGS. 13 and 14, the cam surface 17 of the first barrier blade 8 and the cam surface 18 of the second barrier blade 9 are in the first cam engagement at the end on the shaft 6 side. They are formed at substantially the same inclination angle with respect to the moving direction of the mating protrusion 14 and are rotated by substantially the same amount when pushed by the first cam engaging protrusion 14.
The cam surface 17 of the first barrier blade 8 and the cam surface 18 of the second barrier blade 9 are formed by changing the inclination angle with respect to the moving direction of the first cam engagement protrusion 14 from the middle. Specifically, the inclination angle θ1 from the middle of the cam surface 18 of the second barrier blade 9 is formed larger than the inclination angle θ2 from the middle of the cam surface 17 of the first barrier blade 8. Yes. Accordingly, when the first cam engagement protrusion 14 moves and presses the same inclined angle portion of the cam surface 17 of the first barrier blade 8 and the cam surface 18 of the second barrier blade 9, FIG. 15 and FIG. 16, the first barrier blade 8 and the second barrier blade 9 are rotated by substantially the same amount to be in a so-called half-open state. When the rotation ring 16 is further rotated, the second and fourth barrier blades 9 and 11 are rotated at a larger rotation angle than the first and third barrier blades 8 and 10 due to the difference in the inclination angle. And finally, as shown in FIGS. 12, 17, and 18,
The first barrier blade 8 and the second barrier blade 9 fully open the opening. Although not shown, the inclination angle of the third and fourth barrier blades 10 and 11 with respect to the moving direction of the second cam engagement protrusion 15 is also the same as that of the first and second barrier blades 8 and 9. It is formed in the same manner as the inclination angle and moves in synchronization with these first and second barrier blades 8 and 9.

図１９はベースプレート２２から回動リング１６を取り外すと共に該回動リング１６を回動させる駆動機構を分解した状態を示す斜視図、図２０は駆動機構を組み付けた状態の斜視図である。
上述したように、上記ベースプレート２２の下端にはギヤボックス３４が設けられている。上記ギヤボックス３４は、上面側と背面側と一側面側が開口されている。そして、上記上面側の開口から上記回動リング１６の下端に設けた円弧状のギヤ６１とセンサ遮光部６２がギヤボックス３４内に挿入される。
上記ギヤボックス３４内には上記円弧状のギヤ６１に噛合するギヤ７１と、該ギヤ７１と同軸でこれよりも大径のギヤ７２と、該ギヤ７２に噛合するギヤ７３と、該ギヤ７３に噛合するギヤ７４と、該ギヤ７４と同軸のウォームホイールギヤ７５と、該ウォームホイールギヤ７５に噛合するウォームギヤ７６と、からなるギヤトレインが配置されている。
上記ウォームギヤ７６は、モータ７７の回転軸に取り付けられていて、該モータ７７の回転は、上記ギヤトレインにより減速されて上記円弧状のギヤ６１に伝達されて上記回動リング１６を回動させる。
また、図２１，図２２に示すように、上記ギヤボックス３４内には発光部８１と受光部８２からなる遮光センサ８３が配置されている。遮光センサ８３は、センサ基板８４（図２３参照）にマウントされていて、上記回動リング１６の回動により上記センサ遮光部６２が侵入可能な位置に配置されている。
図２１に示すセンサ遮光部６２が発光部８１と受光部８２の間から抜け出ている状態において、モータ７７で回動リング１６を時計方向に回動させると、図２２に示すように、センサ遮光部６２が発光部８１と受光部８２の間に侵入して遮光センサ８３は、遮光を検出する。この時点から回動リング１６を設定量回動させてモータ７７を停止させることにより上記第1〜第４の複数のバリヤ羽根８〜１１は、開状態から閉状態になる。また、図２２に示す状態から、モータ７７を逆回転させてセンサ遮光部６２が発光部８１と受光部８２の間から抜け出たことを検出したら、この時点から回動リング１６を設定量回動させてモータ７７を停止させることにより上記第1〜第４の複数のバリヤ羽根８〜１１は、閉状態から開状態になる。
図２３に示すように上記モータ７７とセンサ基板８４は、カバープレート９１に取り付けられている。上記カバープレート９１は、ネジ９２によって上記ギヤボックス３４に取り付けられて、該ギヤボックス３４の背面側と一側面側の開口を塞いでいる。また、上記バックプレート２５は、ネジ９３，９４によって上記ベースプレート２２の背面に上記リング状の溝３１を塞いだ状態で、且つ、下端の曲げ起こし部２５aで上記ギヤボックス３４の上面側の開口を塞いだ状態で取り付けられる。
上記ネジ９３，９４は、バックプレート２５に設けたネジ孔９５、ベースプレート２２に設けたネジ孔９６を通してフロントプレート２４のボス部４６に螺合されていて、上記バックプレート２５とベースプレート２２とフロントプレート２４を所謂共締めして、これらを一体的に結合している。
上述したように、上記ギヤボックス３４の開口は、カバープレート９１およびその下端の曲げ起こし部２５aで密閉されて、ギヤボックス３４は、防塵性の高いものになる。また、図２５に示すように、フロントプレート２４を取り外した状態でベースプレート２２の前面側を見ると、ベースプレート２２には、上記第1，第２のカム係合突起１４，１５を突出させるための第1，第２の円弧状の孔３２，３３が形成されているだけであるので、ベースプレート２２の前面側からの防塵性も良好なものになる。
次に、上記レンズバリヤ装置１の作用について説明する。図６に示すように、上記第１の捩じりコイルバネ１２により反時計方向の回動力を付与された第２のバリヤ羽根９は、先端の第３の係合部５６が第１のバリヤ羽根８に設けた第１の係合部５２に係合し、該第２の係合部５２をフロントプレート２４に設けた第１のストッパ５７に押し付けて、上記第１のバリヤ羽根８と第２のバリヤ羽根９とで、上記開口部４の略上半部を塞いだ状態に維持する。一方、上記第２の捩じりコイルバネ１３により反時計方向の回動力を付与された第４のバリヤ羽根１１は、先端の第３の係合部５６が第３のバリヤ羽根１０に設けた第１の係合部５２に係合し、該第１の係合部５２をフロントプレート２４に設けた第２のストッパ５８に押し付けて、上記第３のバリヤ羽根１０と第４のバリヤ羽根１１とで、上記開口部４の略下半部を塞いだ状態に維持する。従って、上記開口部４は、上記第1〜第４の複数のバリヤ羽根８〜１１によって完全に閉じられた状態になる。
上記開口部４が完全に閉じられた状態においては、図１０，図１３，図１４に示すように、上記第1，第２のカム係合突起１４，１５は、上記第1，第２の円弧状の孔３２，３３の一端側に位置して上記カム面と非接触状態になっている。
この状態から回動リング１６を回動させて、第1，第２のカム係合突起１４，１５を矢印方向に移動させると、上述したように上記第1のカム係合突起１４が上記第１のバリヤ羽根８のカム面１７と第２のバリヤ羽根９のカム面１８の同じ傾斜角度部分を押圧するのと同時に、上記第２のカム係合突起１５が上記第３のバリヤ羽根１０のカム面１９と第４のバリヤ羽根１１のカム面２０の同じ傾斜角度部分を押圧して、図１１，図１５，図１６に示すように、第1〜第４の複数のバリヤ羽根８〜１１を半開き状態にする。そして、更に回動リング１６を回動させると、上述したように上記カム面の傾斜角度の相違により第２のバリヤ羽根９，第４のバリヤ羽根１１は、第１のバリヤ羽根８，第３のバリヤ羽根１０よりも大きな回動角度で回動して行って、第1〜第４の複数のバリヤ羽根８〜１１は、図１２，図１７，図１８に示すように、上記開口部を全開状態にする。
また、上記開口部を全開状態から全閉状態にするのには、上記開口部を開く場合と回動リング１６を逆方向に回動させることにより行う。図８に示す開口部を全開した状態で回動リング１６を逆転させると、上記第１の捩じりコイルバネ１２により第２のバリヤ羽根９は、閉方向に回動する。
上記第２のバリヤ羽根９が閉方向に所定角度回動すると、該第２のバリヤ羽根９に設けた第３の係合部５６が第１のバリヤ羽根８に設けた第２の係合部５２に係合して第１のバリヤ羽根８を閉方向に従動させる。そして、上記第２の係合部５２をフロントプレート２４に設けた第１のストッパ５７に押し付けて第１のバリヤ羽根８を閉位置に決め固定する。
一方、第２の捩じりコイルバネ１３により第４のバリヤ羽根１１は、閉方向が閉方向に所定角度回動すると、該第４のバリヤ羽根１１に設けた第３の係合部５６が第３のバリヤ羽根１０に設けた第２の係合部５２に係合して第３のバリヤ羽根１０を閉方向に従動させる。そして、上記第２の係合部５２をフロントプレート２４に設けた第２のストッパ５８に押し付けて第３のバリヤ羽根１０を閉位置に決め固定する。なお、第1〜第４の複数のバリヤ羽根８〜１１のカム面１７〜２０の形状は、上記実施例のものに限定されず、上記カム面１７〜２０の形状を変えることにより第1〜第４の複数のバリヤ羽根８〜１１の開閉のタイミングを適宜に設定することができる。 FIG. 19 is a perspective view showing a state in which the rotation ring 16 is removed from the base plate 22 and the drive mechanism for rotating the rotation ring 16 is disassembled, and FIG. 20 is a perspective view in a state in which the drive mechanism is assembled.
As described above, the gear box 34 is provided at the lower end of the base plate 22. The gear box 34 is open on the upper surface side, the back surface side, and one side surface side. Then, an arc-shaped gear 61 and a sensor light-shielding portion 62 provided at the lower end of the rotating ring 16 are inserted into the gear box 34 from the opening on the upper surface side.
In the gear box 34, a gear 71 that meshes with the arc-shaped gear 61, a gear 72 that is coaxial with the gear 71 and has a larger diameter, a gear 73 that meshes with the gear 72, and a gear 73 A gear train including a meshing gear 74, a worm wheel gear 75 coaxial with the gear 74, and a worm gear 76 meshing with the worm wheel gear 75 is disposed.
The worm gear 76 is attached to a rotating shaft of a motor 77, and the rotation of the motor 77 is decelerated by the gear train and transmitted to the arcuate gear 61 to rotate the rotating ring 16.
Further, as shown in FIGS. 21 and 22, a light shielding sensor 83 including a light emitting portion 81 and a light receiving portion 82 is disposed in the gear box 34. The light shielding sensor 83 is mounted on the sensor substrate 84 (see FIG. 23), and is disposed at a position where the sensor light shielding portion 62 can enter by the rotation of the rotating ring 16.
In a state where the sensor light-shielding part 62 shown in FIG. 21 is pulled out from between the light-emitting part 81 and the light-receiving part 82, when the rotating ring 16 is rotated clockwise by the motor 77, as shown in FIG. When the unit 62 enters between the light emitting unit 81 and the light receiving unit 82, the light shielding sensor 83 detects light shielding. At this time, the rotation ring 16 is rotated by a set amount to stop the motor 77, whereby the first to fourth barrier blades 8 to 11 are changed from the open state to the closed state. Further, from the state shown in FIG. 22, when the motor 77 is rotated in the reverse direction to detect that the sensor light-shielding part 62 has come out between the light-emitting part 81 and the light-receiving part 82, the turning ring 16 is turned by a set amount from this point. When the motor 77 is stopped, the first to fourth barrier blades 8 to 11 change from the closed state to the open state.
As shown in FIG. 23, the motor 77 and the sensor substrate 84 are attached to a cover plate 91. The cover plate 91 is attached to the gear box 34 with screws 92 and closes the opening on the back side and one side of the gear box 34. The back plate 25 has an opening on the upper surface side of the gear box 34 in a state where the ring-shaped groove 31 is closed on the back surface of the base plate 22 with screws 93 and 94 and the bent raising portion 25a at the lower end. Mounted in a closed state.
The screws 93 and 94 are screwed into the boss portion 46 of the front plate 24 through screw holes 95 provided in the back plate 25 and screw holes 96 provided in the base plate 22, and the back plate 25, the base plate 22, and the front plate are connected. 24 are so-called together and these are integrally coupled.
As described above, the opening of the gear box 34 is sealed by the cover plate 91 and the bent raised portion 25a at the lower end thereof, and the gear box 34 has high dust resistance. Further, as shown in FIG. 25, when the front side of the base plate 22 is viewed with the front plate 24 removed, the base plate 22 is provided with the first and second cam engaging protrusions 14 and 15 protruding therefrom. Since only the first and second arc-shaped holes 32 and 33 are formed, the dust resistance from the front side of the base plate 22 is also good.
Next, the operation of the lens barrier device 1 will be described. As shown in FIG. 6, the second barrier blade 9 to which the counterclockwise turning force is applied by the first torsion coil spring 12 has a third engaging portion 56 at the tip thereof as the first barrier blade. 8 is engaged with the first engaging portion 52 provided on the front plate 24, and the second engaging portion 52 is pressed against the first stopper 57 provided on the front plate 24, so that the first barrier blade 8 and the second The barrier blade 9 keeps the substantially upper half of the opening 4 closed. On the other hand, the fourth barrier blade 11 to which the counterclockwise turning force is applied by the second torsion coil spring 13 has a third engagement portion 56 at the tip provided on the third barrier blade 10. 1 engaging portion 52 and pressing the first engaging portion 52 against the second stopper 58 provided on the front plate 24, the third barrier blade 10, the fourth barrier blade 11, Thus, the substantially lower half of the opening 4 is kept closed. Therefore, the opening 4 is completely closed by the first to fourth barrier blades 8 to 11.
When the opening 4 is completely closed, as shown in FIGS. 10, 13, and 14, the first and second cam engaging protrusions 14 and 15 have the first and second cams, respectively. It is located on one end side of the arc-shaped holes 32 and 33 and is not in contact with the cam surface.
When the rotation ring 16 is rotated from this state and the first and second cam engagement protrusions 14 and 15 are moved in the direction of the arrow, the first cam engagement protrusion 14 is moved to the first position as described above. At the same time that the same inclined angle portion of the cam surface 17 of the first barrier blade 8 and the cam surface 18 of the second barrier blade 9 is pressed, the second cam engagement projection 15 of the third barrier blade 10 The same inclined angle portions of the cam surface 19 and the cam surface 20 of the fourth barrier blade 11 are pressed, and as shown in FIGS. 11, 15, and 16, the first to fourth barrier blades 8 to 11. Is opened halfway. When the rotation ring 16 is further rotated, as described above, the second barrier blade 9 and the fourth barrier blade 11 are changed into the first barrier blade 8 and the third barrier blade 11 due to the difference in the inclination angle of the cam surface. As shown in FIGS. 12, 17, and 18, the first to fourth barrier blades 8 to 11 are rotated at a larger rotation angle than the barrier blade 10 of FIG. Fully open.
Further, the opening is changed from the fully open state to the fully closed state by opening the opening and rotating the rotating ring 16 in the reverse direction. When the rotation ring 16 is rotated in the reverse direction with the opening shown in FIG. 8 fully opened, the second barrier blade 9 is rotated in the closing direction by the first torsion coil spring 12.
When the second barrier blade 9 is rotated by a predetermined angle in the closing direction, the third engaging portion 56 provided on the second barrier blade 9 becomes the second engaging portion provided on the first barrier blade 8. The first barrier blade 8 is moved in the closing direction by engaging with 52. Then, the second engaging portion 52 is pressed against the first stopper 57 provided on the front plate 24 to fix the first barrier blade 8 to the closed position.
On the other hand, when the fourth barrier blade 11 is rotated by a predetermined angle in the closing direction by the second torsion coil spring 13, the third engaging portion 56 provided on the fourth barrier blade 11 is moved to the first state. The third barrier blade 10 is engaged with the second engaging portion 52 provided on the third barrier blade 10 to move the third barrier blade 10 in the closing direction. Then, the second engaging portion 52 is pressed against a second stopper 58 provided on the front plate 24 to fix the third barrier blade 10 to the closed position. The shapes of the cam surfaces 17 to 20 of the first to fourth barrier blades 8 to 11 are not limited to those of the above-described embodiment, but the first to fourth shapes can be changed by changing the shapes of the cam surfaces 17 to 20. The timing for opening and closing the fourth plurality of barrier blades 8 to 11 can be set as appropriate.

レンズバリヤ装置をレンズ鏡筒に取り付けてバリヤ羽根を開いた状態の斜視図。The perspective view of the state which attached the lens barrier apparatus to the lens-barrel and opened the barrier blade | wing. レンズバリヤ装置をレンズ鏡筒に取り付けてバリヤ羽根を閉じた状態の斜視図。The perspective view of the state which attached the lens barrier apparatus to the lens-barrel, and closed the barrier blade | wing. レンズバリヤ装置の斜視図。The perspective view of a lens barrier apparatus. レンズバリヤ装置の分解斜視図。The disassembled perspective view of a lens barrier apparatus. フロントプレートを背面側から見た斜視図。The perspective view which looked at the front plate from the back side. バリヤ羽根とバネを組み付けてバリヤ羽根を閉じたフロントプレートの背面図。The rear view of the front plate which attached the barrier blade and the spring and closed the barrier blade. 図６の要部の拡大図。The enlarged view of the principal part of FIG. バリヤ羽根とバネを組み付けてバリヤ羽根を開いたフロントプレートの背面図。The rear view of the front plate which attached the barrier blade and the spring and opened the barrier blade. フロントプレートとベースプレートを開いてバリヤ羽根とバネをベースプレート側に残した状態を示す説明図。Explanatory drawing which shows the state which opened the front plate and the base plate, and left the barrier blade | wing and the spring in the base plate side. バリヤ羽根を全閉した状態におけるカム係合突起とカム面の関係を示す説明図。Explanatory drawing which shows the relationship between the cam engagement protrusion and cam surface in the state which closed the barrier blade | wing. バリヤ羽根を半開した状態におけるカム係合突起とカム面の関係を示す説明図。Explanatory drawing which shows the relationship between the cam engagement protrusion and cam surface in the state which opened the barrier blade | wing halfway. バリヤ羽根を全開した状態におけるカム係合突起とカム面の関係を示す説明図。Explanatory drawing which shows the relationship between the cam engagement protrusion and cam surface in the state which opened the barrier blade | wing fully. 図１０の要部の平面図。The top view of the principal part of FIG. 図１３の要部の拡大図。The enlarged view of the principal part of FIG. 図１１の要部の平面図。The top view of the principal part of FIG. 図１５の要部の拡大図。The enlarged view of the principal part of FIG. 図１２の要部の平面図。The top view of the principal part of FIG. 図１７の要部の拡大図。The enlarged view of the principal part of FIG. 回動リングを回動させるモータとギヤトレインの分解斜視図。The exploded perspective view of the motor and gear train which rotate a rotation ring. モータとギヤトレインを組み付けた状態の斜視図。The perspective view of the state which assembled | attached the motor and the gear train. センサ遮光部による遮光センサの遮光が解除された状態の斜視図。The perspective view in the state where the light shielding of the light shielding sensor by the sensor light shielding unit was released. センサ遮光部により遮光センサが遮光されている状態の斜視図。The perspective view of the state in which the light shielding sensor is light-shielded by the sensor light-shielding part. バックプレートおよびカバープレートを組み付ける前の斜視図。The perspective view before assembling a back plate and a cover plate. バックプレートおよびカバープレートを組み付けた後の斜視図。The perspective view after attaching a back plate and a cover plate. 図２４からフロントプレートを取り外した斜視図。The perspective view which removed the front plate from FIG.

Explanation of symbols

１…レンズバリヤ装置、２…レンズ鏡筒、３…レンズ、４…開口部、５…枠体、６…第１の軸、７…第２の軸、８〜１１…第1〜第４のバリヤ羽根、１２…第１の捻りコイルバネ、１３…第２の捻りコイルバネ、１４…第１のカム係合突起、１５…第２のカム係合突起、１６…回動リング、１７〜１８…カム面、２２…ベースプレート、２４…フロントプレート、２５…バックプレート、３１…リング状の溝、３２…第１の円弧状の孔、３３…第２の円弧状の孔、３４…ギヤボックス、５２…第１の係合部、５３…第２の係合部、５６……第３の係合部、５７…第１のストッパ、５８…第２のストッパ、６２…センサ遮光部、８３…遮光センサ。 DESCRIPTION OF SYMBOLS 1 ... Lens barrier apparatus, 2 ... Lens barrel, 3 ... Lens, 4 ... Opening part, 5 ... Frame, 6 ... 1st axis | shaft, 7 ... 2nd axis | shaft, 8-11 ... 1st-4th Barrier blade, 12 ... first torsion coil spring, 13 ... second torsion coil spring, 14 ... first cam engagement projection, 15 ... second cam engagement projection, 16 ... rotating ring, 17-18 ... cam Surface, 22 ... Base plate, 24 ... Front plate, 25 ... Back plate, 31 ... Ring-shaped groove, 32 ... First arc-shaped hole, 33 ... Second arc-shaped hole, 34 ... Gear box, 52 ... 1st engagement part, 53 ... 2nd engagement part, 56 ... 3rd engagement part, 57 ... 1st stopper, 58 ... 2nd stopper, 62 ... Sensor light-shielding part, 83 ... Light-shielding sensor .

Claims

A frame that forms an opening in front of the lens of the lens barrel;
A plurality of barrier blades that are pivotally attached to first and second shafts arranged at positions opposed to the frame body via the opening, to open and close the opening;
First and second springs biasing the plurality of barrier blades in the closing direction;
The first and second cam engaging projections press the cam surfaces of the plurality of barrier blades by opening the plurality of barrier blades in the opening direction. A rotating ring that rotates
The plurality of barrier blades are
First and second barrier blades that are pivotally attached to the first shaft and that open and close the inside and outside of the half of the opening;
The third and fourth barrier blades that are rotatably attached to the second shaft and that open and close the inside and outside of the remaining half of the opening,
The lens barrier device according to claim 1, wherein cam surfaces of the plurality of barrier blades are formed on an inner surface of a root portion of the shaft.

The cam surfaces of the second and fourth barrier blades have an inclination angle θ1 with respect to the direction of movement of the cam engagement protrusions than an inclination angle θ2 of the first and third barrier blades with respect to the direction of movement of the cam engagement protrusions. The lens barrier device according to claim 1, wherein the lens barrier device is formed to be large.

The first and third barrier blades are moved to a position to close the opening by the first and second springs,
In the second and fourth barrier blades, the first engaging portion provided on the second and fourth barrier blades is associated with the third engaging portion provided on the first and third barrier blades. 2. The lens barrier device according to claim 1, wherein the lens barrier device is moved to a position where the opening is closed by following the first and third barrier blades.

The second and fourth barrier blades are positioned by pressing the first engagement portion against a stopper provided on the frame body by the third engagement portion at a position where the opening is closed. The lens barrier device according to claim 1, characterized in that:

The frame is
A base plate having a first opening forming hole which is disposed in front of the lens of the lens barrel and forms the opening;
A front plate disposed in front of the base plate and having a second opening forming hole that forms the opening together with the first opening forming hole of the base plate,
2. The lens barrier device according to claim 1, wherein the front plate is provided with the first to fourth barrier blades and first and second springs.

The rotating ring is rotatably accommodated in a ring-shaped groove provided on the lens side surface of the base plate,
The first and second cam engaging protrusions provided on the rotating ring protrude from the arc-shaped hole provided on the base plate to the front plate side,
6. The lens barrier device according to claim 5, wherein the ring-shaped groove is closed with a cover plate superimposed on a back surface of the base plate.