JPH0547929U

JPH0547929U - Focal plane shutter

Info

Publication number: JPH0547929U
Application number: JP9992791U
Authority: JP
Inventors: 雄一小澤
Original assignee: 株式会社コパル
Priority date: 1991-12-04
Filing date: 1991-12-04
Publication date: 1993-06-25
Anticipated expiration: 2006-12-04
Also published as: JP2589063Y2

Abstract

(57)【要約】【目的】羽根のたわみを効果的に抑制して衝突による破
損を防止することである。【構成】中間板９のアパーチャ１０で、羽根走行方向に
略直交する方向に位置する上縁１０ａと下縁１０ｂを、
略Ｖ字状に傾斜させて広げて形成する。上縁１０ａはＶ
字状頂点を中央から先羽根の自由端側寄りに位置させ、
下縁１０ｂはＶ字状頂点を中央から後羽根の基部よりに
位置させ、上下縁を夫々形成する２つの対向する傾斜縁
部の角度を互いに異ならせる。 (57) [Abstract] [Purpose] To effectively suppress the deflection of the blades and prevent damage due to collision. [Structure] An aperture 10 of an intermediate plate 9 has an upper edge 10a and a lower edge 10b positioned in a direction substantially orthogonal to the blade traveling direction.
It is formed by inclining and expanding in a substantially V shape. The upper edge 10a is V
Position the letter-shaped vertex from the center to the free end side of the leading blade,
The lower edge 10b has a V-shaped apex located from the center to the base of the rear blade, and has two opposed inclined edges forming the upper and lower edges, respectively, which are different in angle.

Description

【考案の詳細な説明】[Detailed description of the device]

【０００１】[0001]

【産業上の利用分野】[Industrial applications]

本考案は、カメラ用フォーカルプレンシャッタの羽根衝突防止機構に関する。 The present invention relates to a blade collision prevention mechanism for a focal plane shutter for a camera.

【従来の技術】[Prior Art]

【０００２】図３はカメラのフォーカルプレンシャッタの一般的構造を示すものであり、図において、先羽根群３と後羽根群４とは中間板１によって仕切られていることで、各羽根群の作動空間が確保されている。しかしながら、羽根の剛性や強度不足と羽根押さえ板７ａ，７ｂとの関係や羽根の支持アーム５，６との関係等で、走行時等に羽根がたわむことがある。このような場合、羽根の動作中に、羽根のたわみや、更には振動によって羽根が光軸方向にふくらみ、羽根が中間板１のアパーチャ２縁部に衝突することがあった。従来において、羽根がアパーチャ２の縁に衝突するのを防ぐ手段として、例えば次のような衝突防止構造が提案されている。FIG. 3 shows a general structure of a focal plane shutter of a camera. In the figure, the front blade group 3 and the rear blade group 4 are separated by an intermediate plate 1, so that The working space is secured. However, due to insufficient rigidity or strength of the blades, the relationship with the blade pressing plates 7a and 7b, the relationship with the blade support arms 5 and 6, and the like, the blades may bend during running. In such a case, during the operation of the blade, the blade may be deflected or bulged in the optical axis direction due to vibration, and the blade may collide with the edge of the aperture 2 of the intermediate plate 1. Conventionally, for example, the following collision prevention structure has been proposed as a means for preventing the blade from colliding with the edge of the aperture 2.

【０００３】即ち、図４に示すように、中間板１のアパーチャ２において、羽根走行方向と略直交する方向の上縁２ａ及び下縁２ｂは、夫々頂点が中央に位置するようにＶ字状に広げられて形成されている。これにより、羽根走行時に羽根が光路方向にたわんだ場合、たわみ部分はＶ字状の上縁２ａ又は下縁２ｂに当接する際、同一傾斜角の２つの傾斜縁部に２点で当接し、たわみ部分とＶ字状縁とが互いにすり合うことで、たわみが押されて抑制されつつ羽根が走行し、Ｖ字状頂点を経由することで、縁への衝突が緩和されるというものである。That is, as shown in FIG. 4, in the aperture 2 of the intermediate plate 1, the upper edge 2a and the lower edge 2b in the direction substantially orthogonal to the blade traveling direction are V-shaped so that their vertices are located in the center. It is formed by spreading. As a result, when the blade is deflected in the optical path direction while the blade is running, when the deflected portion contacts the V-shaped upper edge 2a or the lower edge 2b, it contacts two inclined edges having the same inclination angle at two points, When the flexure and the V-shaped edge rub against each other, the blade runs while suppressing and suppressing the deflection, and the collision with the edge is mitigated by passing through the V-shaped apex. is there.

【０００４】ところで、図５（Ａ），（Ｂ）に示すように、先羽根群３と後羽根群４は夫々シャッタ基板８に回動可能に支持された支持アーム５，６に枢着されており、図示しない駆動手段によって支持アーム５，６を回動させることで、先羽根群３と後羽根群４とは夫々図中上下方向に走行させられて、アパーチャ２に対して開閉作動するようになっている。しかも、各羽根群３，４は走行時のあばれを防止するために、夫々羽根押さえ板７ａ，７ｂによって中間板１との間で走行空間が限定されている。By the way, as shown in FIGS. 5A and 5B, the leading blade group 3 and the trailing blade group 4 are pivotally attached to support arms 5 and 6 which are rotatably supported by a shutter substrate 8. By rotating the support arms 5 and 6 by a driving means (not shown), the leading blade group 3 and the trailing blade group 4 are caused to travel in the vertical direction in the figure, and the opening / closing operation is performed with respect to the aperture 2. It is supposed to do. Moreover, the traveling space of each of the blade groups 3 and 4 is limited between them and the intermediate plate 1 by the blade pressing plates 7a and 7b, respectively, in order to prevent misalignment during traveling.

【０００５】[0005]

【考案が解決しようとする課題】[Problems to be solved by the device]

しかしながら、図６（Ａ）に示すように、先羽根群３はその基部が支持アーム５で枢着され、自由端部は羽根押さえ板７ａで規制されるため、羽根全体が基部から自由端方向に向かって中間板１方向に傾斜し、自由端部付近で展開走行時にたわみが生じる。この先羽根群３のたわみは展開走行時に上縁２ａの傾斜縁部に当接し、この状態で更に走行するために、たわみは上縁２ａに押圧されつつＶ字状頂点方向へ波打つように移動し、Ｖ字状頂点付近で対向する２つの傾斜縁部に２点で当接するため、大きな衝撃になる。又、後羽根群４は展開作動時にはバネの弾力で一気に作動するので、図５（Ｂ）及び図６（Ｂ）に示すように、支持アーム６への枢着部近傍でたわみが生じる。この後羽根群４のたわみも下縁２ｂの一方の傾斜縁部に当接して押圧され、羽根の走行に従って下縁２ｂのＶ字状頂点付近で対向する２つの傾斜縁部に２点で当接するため、衝撃が大きい。このように、従来の構造では羽根の衝突を十分に防止することができず、羽根のスムーズな走行が妨げられ、衝突時に羽根が破損することもあるという欠点があった。 However, as shown in FIG. 6 (A), since the base of the leading blade group 3 is pivotally attached by the support arm 5 and the free end is regulated by the blade pressing plate 7a, the entire blade moves from the base to the free end. Inclination toward the intermediate plate 1 toward the side, and deflection occurs during deployment traveling near the free end. The deflection of the leading blade group 3 comes into contact with the inclined edge portion of the upper edge 2a during traveling, and in order to further travel in this state, the deflection is wavy toward the V-shaped apex direction while being pressed by the upper edge 2a. It moves and abuts two inclined edges facing each other near the V-shaped apex at two points, resulting in a great impact. Further, since the trailing blade group 4 is actuated at once by the elastic force of the spring during the expanding operation, as shown in FIGS. 5 (B) and 6 (B), bending occurs in the vicinity of the pivotal attachment to the support arm 6. The deflection of the rear blade group 4 also comes into contact with and is pressed against one of the inclined edges of the lower edge 2b, and the two inclined edges facing each other near the V-shaped apex of the lower edge 2b at two points as the blade travels. Since it abuts, the impact is large. As described above, the conventional structure cannot sufficiently prevent the impingement of the blades, impedes smooth traveling of the impellers, and has a drawback that the impellers may be damaged during the impingement.

【０００６】本考案は、このような課題に鑑みて、羽根走行時の羽根のたわみによるアパーチャの縁との衝突を緩和して、羽根の損傷を防止できるフォーカルプレンシャッタを提供することを目的とする。In view of the above problems, the present invention provides a focal plane shutter capable of preventing damage to the blade by mitigating collision with the edge of the aperture due to deflection of the blade during traveling of the blade. To aim.

【０００７】[0007]

【課題を解決するための手段】[Means for Solving the Problems]

本考案によるカメラ用フォーカルプレンシャッタは、撮影光路部分にアパーチャが形成された中間板によって、先羽根群と後羽根群の走行空間が仕切られていて、アパーチャの羽根群走行方向に略直交する一対の縁部が夫々略Ｖ字形状に広がって傾斜しているカメラ用フォーカルプレンシャッタにおいて、一対の縁の略Ｖ字状の頂点が夫々縁中央から互いに反対方向にずれて形成されていることを特徴とするものである。 In the focal-plane shutter for a camera according to the present invention, the traveling space of the front blade group and the rear blade group is partitioned by the intermediate plate having the aperture formed in the photographing optical path portion, and is substantially orthogonal to the traveling direction of the aperture blade group. In a focal plane shutter for a camera in which a pair of edge portions are respectively widened and inclined in a substantially V-shape, the substantially V-shaped apexes of the pair of edges are formed so as to be offset from the center of the edges in mutually opposite directions. It is characterized by being present.

【０００８】[0008]

【作用】[Action]

羽根の基部近傍又は自由端部近傍にたわみが生じた場合、上縁又は下縁の一方の傾斜縁部に当接しつつ走行することになり、たわみは抑制されつつＶ字状頂点方向へ波打つように移動するが、頂点付近でも一方の傾斜縁部にのみ当接するから接触点は１点だけであり、縁との間に強い衝撃が生じることなくはさみの二つの刃が交差するかのように走行して停止位置に至る。 If a deflection occurs near the base of the blade or near the free end, it will run while contacting one of the upper or lower edges, and the deflection will be suppressed while wavy in the V-shaped apex direction. However, since there is only one contact point near the apex even if it touches only one inclined edge, the two blades of the scissors intersect without causing a strong impact with the edge. To drive to the stop position.

【０００９】[0009]

【実施例】【Example】

以下、本考案の好適な一実施例を図１及び図２に基づいて説明するが、上述の従来技術と同様の部分には同一の符号を用いてその説明を省略する。図１は本実施例による中間板の正面図であり、図２（Ａ）は中間板の上縁と先羽根のたわみ位置との関係を示す図、（Ｂ）は中間板の下縁と後羽根のたわみ位置との関係を示す図である。 A preferred embodiment of the present invention will be described below with reference to FIGS. 1 and 2, but the same parts as those in the above-described conventional art are designated by the same reference numerals and the description thereof will be omitted. FIG. 1 is a front view of an intermediate plate according to the present embodiment, FIG. 2 (A) is a diagram showing the relationship between the upper edge of the intermediate plate and the deflection position of the leading blade, and FIG. 2 (B) is the lower edge of the intermediate plate and the rear. It is a figure which shows the relationship with the deflection position of a blade.

【００１０】図１において、中間板９に形成された撮影光通過用のアパーチャ１０は、羽根走行方向に略直交する方向の上縁１０ａと下縁１０ｂとが、夫々対向する方向にＶ字状に広げられて形成されている。そして、展開作動する先羽根群３のたわみ（図６（Ａ）参照）が当接し得る上縁１０ａは、Ｖ字状の頂点が中央から先羽根群３の自由端側（図１の右側）寄りに形成されている。しかも、Ｖ字状上縁１０ａを形成する傾斜縁部１０ａ−１と傾斜縁部１０ａ−２とは、夫々傾斜角度を異ならせており、辺長の短い傾斜縁部１０ａ−１の方が傾斜角度が大きく、頂点から右端（図中）へ延びている。一方、展開作動する後羽根群４のたわみ部分（図６（Ｂ）参照）が当接し得る下縁１０ｂは、Ｖ字状の頂点が中央から後羽根群４の基部寄り（図１の左側）に形成されている。しかも、Ｖ字状下縁１０ｂを形成する傾斜縁部１０ｂ−１と傾斜縁部１０ｂ−２とは夫々傾斜角度を異ならせており、辺長の短い傾斜縁部１０ｂ−１の方が傾斜角度が大きく、頂点から左端（図１参照）へ延びている。In FIG. 1, an aperture 10 for passing photographing light, which is formed on an intermediate plate 9, has a V shape in which an upper edge 10a and a lower edge 10b in a direction substantially orthogonal to the blade traveling direction are V-shaped in directions opposite to each other. It is formed by spreading. Then, the upper edge 10a with which the deflection (see FIG. 6A) of the leading blade group 3 which is deployed operates can contact the V-shaped apex from the center to the free end side of the leading blade group 3 (right side in FIG. 1). It is formed nearer. Moreover, the slanted edge portion 10a-1 and the slanted edge portion 10a-2 forming the V-shaped upper edge 10a have different slant angles, respectively. Has a large inclination angle and extends from the apex to the right end (in the figure). On the other hand, the lower edge 10b with which the flexure portion (see FIG. 6 (B)) of the rear blade group 4 that is deployed operates can contact the V-shaped apex from the center toward the base of the rear blade group 4 (left side in FIG. 1). Are formed in Moreover, the slanting edge portion 10b-1 and the slanting slanting edge portion 10b-2 forming the V-shaped lower edge 10b have different slanting angles, and the slanting edge portion 10b-1 having a shorter side length is more preferable. It has a large inclination angle and extends from the apex to the left end (see FIG. 1).

【００１１】本実施例は上述のように構成されているから、羽根走行時に、先羽根群３は重畳された位置から上縁１０ａ方向に展開走行する時、図６（Ａ）に示すように、羽根自由端側にたわみ３ａが生じることがある。この場合、羽根３のたわみ３ａは上縁１０ａの短辺の傾斜縁部１０ａ−１に、１点で当接する（図２（Ａ）参照）。そして、更に先羽根群３が走行するため、たわみ３ａは１点で当接する傾斜縁部１０ａ−１に抑圧されて、たわみ部分が上縁１０ａのＶ字状頂点方向に波打つように羽根３上で移動してゆく。しかも長辺の傾斜縁部１０ａ−２より短辺の傾斜縁部１０ａ−１の方が傾斜角度が大きいため、２点で当接することなく上縁１０ａの頂点部分を通過し、あたかもはさみの刃がすれ違うかのようにスムーズに上縁１０ａと交差してアパーチャ１０を覆い、展開した停止位置へ至る。Since this embodiment is configured as described above, when the leading blade group 3 is deployed and run from the overlapped position toward the upper edge 10a when the blade is running, as shown in FIG. 6 (A). In addition, a deflection 3a may occur on the blade free end side. In this case, the deflection 3a of the blade 3 comes into contact with the inclined edge portion 10a-1 on the short side of the upper edge 10a at one point (see FIG. 2A). Further, since the leading blade group 3 further travels, the deflection 3a is suppressed by the inclined edge portion 10a-1 that abuts at one point, and the deflection portion undulates in the V-shaped apex direction of the upper edge 10a. Move on 3. Moreover, since the slanted edge 10a-1 of the short side has a larger slant angle than the slanted edge 10a-2 of the long side, the slanted edge 10a-1 passes through the apex portion of the upper edge 10a without abutting at two points, as if the blade of scissors As if they passed each other, they smoothly intersect with the upper edge 10a and cover the aperture 10, and reach the deployed stop position.

【００１２】又、後羽根群４は重畳された位置から下縁１０ｂ方向に走行する時、図６（Ｂ）に示すように基部寄りにたわみ４ａが生じ得るが、この場合もたわみ４ａは下縁１０ｂの傾斜角度の大きい短辺の傾斜縁部１０ｂ−１に、１点で当接する。そして、後羽根群４の走行につれてたわみ４ａは傾斜縁部１０ｂ−１に押圧されてＶ字状頂点方向に移動するが、頂点付近でも２点で当接することなく通過し、はさみの刃がすれ違うかのように下縁１０ｂとスムーズに交差してアパーチャ１０を覆って、展開位置で停止する。When the rear blade group 4 travels from the superposed position in the direction of the lower edge 10b, a deflection 4a may occur near the base as shown in FIG. 6B. In this case, too, the deflection 4a is lowered. The edge 10b abuts the inclined edge portion 10b-1 on the short side having a large inclination angle at one point. Then, as the trailing blade group 4 travels, the deflection 4a is pressed by the inclined edge portion 10b-1 and moves in the direction of the V-shaped apex, but the deflection 4a passes without contacting at two points even in the vicinity of the apex, and scissors. Smoothly intersects the lower edge 10b, covers the aperture 10 and stops at the deployed position as if the blades had passed each other.

【００１３】上述のように本実施例は、簡単な構造で、羽根にたわみが生じても走行時のアパーチャ１０の上縁１０ａ又は下縁１０ｂとの衝突を、従来のものより効果的に抑えてたわみを抑制し、スムーズな羽根の走行を実現できる。しかも、たわみによる中間板９と羽根との衝突による羽根の損傷を確実に防止できる。As described above, the present embodiment has a simple structure and is more effective than the conventional one in the collision with the upper edge 10a or the lower edge 10b of the aperture 10 during traveling even if the blade is bent. Suppresses the deflection to achieve smooth blade travel. Moreover, damage to the blades due to the collision between the intermediate plate 9 and the blades due to the bending can be reliably prevented.

【００１４】尚、羽根がたわむ位置及びたわみがアパーチャの縁に当接する位置は、シャッタ装置の型式やシャッタ速度で若干異なるので、実験等を通して、上下縁１０ａ，１０ｂのＶ字状頂点の位置を各縁の中央からずれた領域の範囲内で適宜選択すればよい。又、上下縁１０ａ，１０ｂのＶ字状頂点を形成する２つの傾斜縁部の角度も互いに異なるという条件の下で適宜選定することができる。Since the position where the blades bend and the position where the deflection contacts the edge of the aperture are slightly different depending on the model of the shutter device and the shutter speed, the positions of the V-shaped vertices of the upper and lower edges 10a and 10b are determined through experiments and the like. May be appropriately selected within the range of the area deviated from the center of each edge. Further, the angles of the two inclined edges forming the V-shaped vertices of the upper and lower edges 10a and 10b can be appropriately selected under the condition that the angles are different from each other.

【００１５】[0015]

【考案の効果】[Effect of the device]

上述のように、本考案によるフォーカルプレンシャッタは、簡単な構造で、中間板のアパーチャの一対の略Ｖ字状縁を、中央から互いに反対方向にずれた位置に頂点が位置するように夫々形成するようにしたから、羽根走行時に発生し得るたわみを効果的に抑えて、スムーズに走行させることができ、羽根と中間板との衝突を確実に防止することができるという実用上重要な利点を有する。 As described above, the focal plane shutter according to the present invention has a simple structure, and the pair of substantially V-shaped edges of the aperture of the intermediate plate are arranged so that the vertices are located at positions displaced from the center in opposite directions. Since the blades are formed, it is possible to effectively suppress the deflection that may occur when the blades are running, to make the blades run smoothly, and to prevent the blades from colliding with the intermediate plate, which is an important practical advantage. Have.

【図面の簡単な説明】[Brief description of drawings]

【図１】本考案の実施例による中間板の正面図である。FIG. 1 is a front view of an intermediate plate according to an embodiment of the present invention.

【図２】図１の中間板に羽根が当接する位置を示すもの
であり、（Ａ）は先羽根が上縁に当接する状態、（Ｂ）
は後羽根が下縁に当接する状態を、夫々示す図である。FIG. 2 shows a position where the blade contacts the intermediate plate in FIG. 1, (A) shows a state where the leading blade contacts the upper edge, and (B).
[Fig. 3] is a diagram showing a state in which the rear blade contacts the lower edge.

【図３】フォーカルプレンシャッタの一般的な構成を示
す分解斜視図である。FIG. 3 is an exploded perspective view showing a general configuration of a focal plane shutter.

【図４】従来の中間板の正面図である。FIG. 4 is a front view of a conventional intermediate plate.

【図５】（Ａ），（Ｂ）は従来の中間板に羽根が当接す
る状態を示す図２（Ａ），（Ｂ）と同様の図である。5 (A) and 5 (B) are views similar to FIGS. 2 (A) and 2 (B) showing a state in which a blade is in contact with a conventional intermediate plate.

【図６】アパーチャの縁との関係で羽根のたわみが生じ
る位置を示すものであり、（Ａ）は上縁に対する先羽根
のたわみ位置、（Ｂ）は下縁に対する後羽根のたわみ位
置を夫々示す図である。6A and 6B show positions where the deflection of the blade occurs in relation to the edge of the aperture. FIG. 6A shows the deflection position of the leading blade with respect to the upper edge, and FIG. 6B shows the deflection position of the trailing blade with respect to the lower edge. FIG.

【符号の説明】[Explanation of symbols]

３先羽根群４後羽根群９中間板１０アパーチャ１０ａ上縁１０ｂ下縁 3 Front blade group 4 Rear blade group 9 Intermediate plate 10 Aperture 10a Upper edge 10b Lower edge

Claims

【実用新案登録請求の範囲】[Scope of utility model registration request]

【請求項１】撮影光路部分にアパーチャが形成された中
間板によって、先羽根群と後羽根群の走行空間が仕切ら
れていて、該アパーチャの羽根群走行方向に略直交する
一対の縁が夫々略Ｖ字形状に広がって傾斜しているカメ
ラ用フォーカルプレンシャッタにおいて、前記一対の縁の略Ｖ字状の頂点が夫々縁中央から互いに
反対方向にずれて形成されていることを特徴とするフォ
ーカルプレンシャッタ。1. A traveling space of a front blade group and a rear blade group is partitioned by an intermediate plate having an aperture formed in a photographing optical path portion, and a pair of edges of the aperture which are substantially orthogonal to a traveling direction of the blade group are respectively formed. In a focal plane shutter for a camera that spreads and is inclined in a substantially V shape, the apexes of the substantially V shape of the pair of edges are formed so as to be offset from the center of the edges in mutually opposite directions. Plane shutter.