JPS612140A - Electromagnetic driving shutter - Google Patents

Abstract

PURPOSE:To improve the accuracy of a shutter by disengaging a shutter blade driving member held at a travelling completing position simultaneously with film winding and restoring the driving member to a travelling start position by inertia. CONSTITUTION:When a winding interlocking shaft 48 interlocking with a winding means starts to rotate, a restoration lever 40 is rotated around a shaft 49a in the counterclockwise direction to press a suspension lever 28 in the arrow direction. At that time, its right end part 28c presses a pin 7a on a front blade driving lever 7 and a notched edge 28b on an intermediate part presses a pin 5a on a back blade driving lever 5. Consequently, a front blade driving pin 6 and a back blade driving pin 4 get over the bending parts 36a, 34a of holding springs 36, 34 and the holding at the travelling completing positions is released. When a restoration level 40 is rotated continuously, the driving levers 7, 5 are rapidly pressed to their travelling start positions and immediately restored to the travelling start positions by inertia and restoration springs 44, 45. Thus, the shutter accuracy can be improved.

Description

【発明の詳細な説明】 （利用分野） 本発明はシャッター羽根を露光走行の際にのみ電磁力に
より駆動する電磁駆動シャッターに関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Application) The present invention relates to an electromagnetically driven shutter in which shutter blades are driven by electromagnetic force only during exposure travel.

（従来技術） 従来シャッター羽根を露光走行の際は電磁駆動し、復帰
の際はスプリングによって駆動する電磁シャッターにお
いては、シャッター先羽根を露光動作の終了まで走行完
了位置に保持するための保持機構が設けられ、その保持
解除のために、ミラーの下降或はシャッター後羽根走行
完了信号によって作動する保持解除機構が設けられてい
た。このシャッター羽根復帰用スプリングは露光走行時
には電磁駆動源に余分の負荷となり、消費電流を増加さ
せるものであるから極力弱いものが使われている。この
ためシャッター羽根の復帰に長い時間がかかり、モータ
ードライブ使用時には充分な駒速か得られない。又、シ
ャッター羽根の走行開始位置への復帰から次の走行まで
の時間が短くなり、安定時間がとれないためシャッター
精度を悪くするという問題が生じた。(Prior art) Conventional electromagnetic shutters, in which the shutter blades are electromagnetically driven during exposure travel and driven by springs when returning, have a holding mechanism to hold the shutter leading blade in the travel completion position until the end of the exposure operation. In order to release the holding, a holding release mechanism is provided which is activated by the lowering of the mirror or a shutter trailing blade travel completion signal. The spring for returning the shutter blades is made as weak as possible because it places an extra load on the electromagnetic drive source during exposure and increases current consumption. For this reason, it takes a long time for the shutter blades to return, making it impossible to obtain a sufficient frame speed when using a motor drive. Further, the time from the return of the shutter blade to the travel start position to the next travel is shortened, and a stabilization time cannot be taken, resulting in a problem of poor shutter accuracy.

（発明の概略） 本発明はこの様な欠点を解消することを目的とするもの
で、シャッター羽根駆動部材をバネ部材によって係止す
ることにより走行完了位置に保持し、フィルム巻上ｍ構
の駆動力をシャッター羽根駆動部材に直接伝達すること
により、特別の保持解除機構を設けることなく保持を解
除すると共にシャッター羽根を迅速に走行開始位置へ復
帰させる様にした。(Summary of the Invention) The purpose of the present invention is to eliminate such drawbacks, and the purpose of the present invention is to hold the shutter blade drive member in the travel completion position by locking it with a spring member, and to drive the film winding mechanism. By directly transmitting force to the shutter blade drive member, the holding is released without providing a special holding/release mechanism, and the shutter blade is quickly returned to the travel starting position.

（実施例） 以下本発明実施例を図について説明する。(Example) Embodiments of the present invention will be described below with reference to the drawings.

第１図は本発明を適用する電磁駆動フォーカルプレンシ
ャッターの原理的構成を示す斜視図で、１ａは後羽根の
スリ、ト形成羽根、１ｂ〜１ｅは補助羽根で、第２図に
示す様な地板に夫々設けられた軸８．９の周りに回動可
能なアーム２．３に連結ピン２８〜２ｅ、３ａ〜３ｅに
よって平行リンクを構成する様取り付けられ、後羽根は
図示の走行開始位置では折畳まれて開口の一側に収納さ
れている。１Ｆ、は先羽根のスリ、ト形成羽根、１！ｂ
〜１′・は補助羽根で後羽根と同様に軸１０．１１の周
りに回動可能なアーム２′〜３／に連結ビン２／ａ〜２
／、　、　３／ＩＩ〜３’ｅによって平行リンクを形成
する様に取りつけら八くの先羽根は走行開始前は開口を
覆う状態にある。FIG. 1 is a perspective view showing the basic structure of an electromagnetically driven focal plane shutter to which the present invention is applied, in which 1a is a rear blade slit and groove forming blade, 1b to 1e are auxiliary blades, as shown in FIG. Connecting pins 28 to 2e, 3a to 3e are attached to arms 2.3 that are rotatable around shafts 8.9 provided on the main plate so as to form parallel links, and the rear blades are not in the running start position shown in the figure. It is folded and stored on one side of the opening. 1F, is the leading blade slit, the to forming blade, 1! b
~1' is an auxiliary blade connected to an arm 2'~3/ which can be rotated around an axis 10.11 in the same way as the rear blade.
The eight leading blades attached to form parallel links by 3/II to 3'e cover the opening before the start of travel.

１２は不図示の取付部材を介して地板に取付けられた後
羽根用電磁駆動源で、２０は永久磁石１６はヨーク、２
３は永久磁石の磁界内で回動する可動コイル、１４は該
コイルに固着された後羽根駆動軸で、前記アーム３の軸
５と同心に設けられている。１８はコイル２３のフミュ
テータ、１９は給電用ブラシである。Reference numeral 12 denotes an electromagnetic drive source for the rear blade attached to the main plate via a mounting member (not shown), 20 a permanent magnet 16, a yoke, 2
3 is a movable coil that rotates within the magnetic field of a permanent magnet; 14 is a rear blade drive shaft fixed to the coil; and is provided concentrically with the shaft 5 of the arm 3. 18 is a fumutator of the coil 23, and 19 is a power supply brush.

後羽根駆動軸１４の下端には後羽根駆動レバー５が同情
され、その下面に植設されたピン４が前記レバー３に設
けた孔に嵌りて、フィル２３の回動をレバー３に伝える
ようになっている。１３は先羽根用電磁駆動源で、後羽
根用電磁駆動源１２と同様に構成され、その駆動軸１５
は先羽根駆動レバー７、ビン６を介して先羽根アーム２
／に連結されている。A rear blade drive lever 5 is mounted on the lower end of the rear blade drive shaft 14, and a pin 4 planted on the lower surface of the lever 5 fits into a hole provided in the lever 3 to transmit the rotation of the fill 23 to the lever 3. It has become. Reference numeral 13 denotes an electromagnetic drive source for the leading blade, which is configured similarly to the electromagnetic drive source 12 for the trailing blade, and its drive shaft 15
is the leading blade arm 2 via the leading blade drive lever 7 and the pin 6.
/ is connected to.

第２図は本願発明の実施例を示すもので、シャッター先
羽根及び後羽根は地板３８とカバー板３９との間に保持
され、電磁駆動源のフィル２３の時計方向の回動は地板
３Ｂに設けられた円弧溝３８ｂ、３８ｃを貫通する駆動
ビン６．４を介して前述の様にアーム２′、３に伝達さ
れて夫々矢印方向に走行して開口３８ａを開閉する様に
なっている。FIG. 2 shows an embodiment of the present invention, in which the front and rear shutter blades are held between the base plate 38 and the cover plate 39, and the clockwise rotation of the fill 23 of the electromagnetic drive source is caused by the base plate 3B. As described above, the driving force is transmitted to the arms 2' and 3 through the driving pins 6.4 passing through the circular arc grooves 38b and 38c, so that they travel in the directions of the arrows to open and close the opening 38a.

３２は地板上の軸３３で枢支され、バネ４７で反時計方
向に回動付勢された先羽根飛出し阻止レバーで、先羽根
が走行開始位置にある時先端３２ｍが前記先羽根駆動レ
バー７の１腕７　ｂ、と対向し−Ｃその回動を阻止し、
スリ、ト形成羽根の移動により開口が開くことを防止し
得る様になっている。Reference numeral 32 denotes a leading blade protrusion prevention lever which is pivotally supported by a shaft 33 on the base plate and rotated counterclockwise by a spring 47, and when the leading blade is at the travel start position, the tip 32m is connected to the leading blade driving lever. 7's 1st arm 7 b, faces -C and prevents its rotation,
It is possible to prevent the opening from opening due to movement of the slot-forming blades.

３１は同軸３３に枢支され、バネ４６で反時計方向に回
動付勢された後羽根飛出し阻止レバーで、前記７と同様
に先端３１ｍが後羽根駆動レバー５の一腕５ｂと係合し
てその回動を阻止し、後幕が開口内に飛び出すことを防
止する様になっている。Reference numeral 31 denotes a rear blade protrusion prevention lever that is pivotally supported on the same shaft 33 and rotated counterclockwise by a spring 46, and its tip 31m engages with one arm 5b of the rear blade drive lever 5 as in 7 above. The rear curtain is designed to prevent its rotation and prevent the rear curtain from jumping out into the opening.

３０は軸４２に枢支され、阻止レバーに作用する作動レ
バーで、−腕には前記阻止レバー３２゜３１の細腕３２
ｂ、３１ｂに係合する折曲部３０ｍが設けられ、他端に
はビンａｏｂが固設されている。Reference numeral 30 denotes an operating lever that is pivotally supported on a shaft 42 and acts on the blocking lever, and the - arm includes the narrow arm 32 of the blocking lever 32 and 31.
A bent portion 30m that engages with the portions b and 31b is provided, and a bin aob is fixed to the other end.

２４は取付部材２５を介して地板に固着された電磁石で
、コイル２６に通電された時アーマチャ２７を吸引して
軸２５ａの周りに回動させることによりその他端２７ｍ
で前記ピン３０ｂを押して、作動レバー３０を反時計方
向に回動させる様になっている。24 is an electromagnet fixed to the ground plate via a mounting member 25, and when the coil 26 is energized, it attracts the armature 27 and rotates it around the shaft 25a, thereby causing the other end 27m to
By pressing the pin 30b, the operating lever 30 is rotated counterclockwise.

２Ｂは先羽根駆動レバー及び後羽根駆動レバーをフィル
ム巻上げに連動して走行開始位置に向って押し戻すため
のチャージレバーで、その長孔が軸２９．４２に嵌って
長手方向に摺動案内されている。2B is a charge lever for pushing the leading blade drive lever and the trailing blade drive lever back towards the travel start position in conjunction with film winding; its elongated hole fits into the shaft 29.42 and is slidably guided in the longitudinal direction. There is.

４８は不図示の巻上機構に連動し、フィルム−駒巻上ご
とに一回転する巻上連動軸で、下端に設けた円板４８ａ
の偏心位置にピン４８ｂを固植されている。４０は地板
４９上に軸４９ｍで枢支された復帰レバーで、上端の折
曲部４０ｍが前記ビン４８ｂに当接して、軸４８の回動
に従って軸４０ａの周りに回動することによりその下端
部４０ｂ（第３図示）でチャージレバー２８を図の右方
へ移動させるようになっている。Reference numeral 48 denotes a winding interlocking shaft that is linked to a winding mechanism (not shown) and rotates once each time a film frame is wound up, and a disc 48a provided at the lower end.
A pin 48b is fixed at an eccentric position. Reference numeral 40 denotes a return lever that is pivotally supported on the main plate 49 by a shaft 49m, and the bent portion 40m at the upper end contacts the bin 48b and rotates around the shaft 40a according to the rotation of the shaft 48, thereby releasing the lower end of the lever. The charge lever 28 is moved to the right in the figure by the portion 40b (shown in the third figure).

４４．４５は先羽根駆動レバー７、後羽根駆動レバー５
を夫々走行開始位置へ向って回動付勢する復帰バネ、３
６．３４は駆動ピン６ｊ４を夫々走行完了位置に保持す
る保持バネで、夫々基部を地板３８に鋲３５．３７で固
着、され、先端の係止用折曲部３６ａ、３４ｍは駆動ビ
ン６．４の回動路の終端付近に突出している ５０は先羽根駆動ビン６に押されてオンとなる先羽根走
行完了スイッチ、６１は先羽根駆動ビン４によってオン
となる後羽根走行完了スイッチである。44.45 are leading blade drive lever 7, trailing blade drive lever 5
a return spring for rotating and biasing each toward the travel start position, 3;
Reference numeral 6.34 denotes a holding spring that holds the drive pins 6j4 at the respective travel completion positions, and their bases are fixed to the base plate 38 with studs 35.37, and the locking bent portions 36a and 34m at the tips are attached to the drive pins 6j4. The reference numeral 50 protruding near the end of the rotation path 4 is a leading blade travel completion switch that is turned on when pushed by the leading blade drive bin 6, and the reference numeral 61 is a trailing blade travel completion switch that is turned on by the leading blade drive bin 4. .

次にシャッターの作動について説明する。第１図に示す
様に先羽根１’ａｘｌ’ｅが開口を覆った状態から通電
ブラシ１９、コミュテータ１Ｂを介して先羽根駆動フィ
ル２３に電流が流されると、該コイルには１フレミング
の左手の法則で知られる起磁力が発生し、駆動軸１５に
回転力が生じる。Next, the operation of the shutter will be explained. As shown in FIG. 1, when a current is applied to the leading blade driving filter 23 via the energizing brush 19 and the commutator 1B from the state where the leading blade 1'axl'e covers the opening, the left hand of 1 Fleming is applied to the coil. A magnetomotive force known from the law is generated, and rotational force is generated on the drive shaft 15.

この回転は先羽根駆動レバー７、駆動ピン６を介して羽
根駆動アーム２を軸１１の周りに回転させる。前述の様
にアーム２／、３／とシャッター羽根１’ａ〜１／ｅは
平行リンク機構を構成しているのでアームピの回転に従
って各羽根は図の左から右へ互の重なり量を増しつつ平
行移動して開口を開いて行き露光を開始する。続いて後
羽根駆動用コイル２３へ同様にして通電すると後羽根駆
動＠１１１４が回転し、後羽根１ｍ〜１＠は図示の互に
重なり合った状態から次第に開きつつ図の右方へ移動し
て艮］口を臣り状態となって露光を終了する。This rotation causes the blade drive arm 2 to rotate around the axis 11 via the leading blade drive lever 7 and the drive pin 6. As mentioned above, the arms 2/, 3/ and the shutter blades 1'a to 1/e form a parallel link mechanism, so as the arm pi rotates, the amount of overlap between each blade increases from left to right in the figure. It moves in parallel to open the aperture and starts exposure. Next, when power is applied to the rear blade drive coil 23 in the same manner, the rear blade drive @1114 rotates, and the rear blades 1m to 1@ gradually open from the mutually overlapping state shown in the figure and move to the right in the figure. ] The exposure ends with the camera closed.

上記の様な露光走行の準備が完了して先羽根及び後羽根
が第１図示の走行待機状態にある時、先羽根駆動ビン６
が復帰バネ４４のカを受けて不図示のストッパーに当り
て駆動レバー７は停止しており、先羽根飛出し阻止レバ
ー３２はバネ４７の付勢力を受けてその左端で解除レバ
ー３ｏの折曲部３０８を押し、該レバー３ｏの細腕のビ
ン３０ｂによりてアーマチャレバーの腕２７ｍを押し上
げた状態で停止している。この時阻止レバー３２の先端
３２ａは第２図及び第３図に示す様に先羽根駆動レバー
７の腕７ｂと微少な間隔をもって対向しており、該駆動
レバー７の走行方向への回動を阻止し、シャッター羽根
の飛び出しを防止する。When the preparation for the exposure run as described above is completed and the leading blade and trailing blade are in the running standby state as shown in the first figure, the leading blade drive bin 6
receives the force of the return spring 44 and hits a stopper (not shown), and the drive lever 7 is stopped, and the leading blade protrusion prevention lever 32 receives the biasing force of the spring 47 and bends the release lever 3o at its left end. 308, and the arm 27m of the armature lever is stopped in a state where the arm 27m of the armature lever is pushed up by the pin 30b of the narrow arm of the lever 3o. At this time, the tip 32a of the blocking lever 32 is opposed to the arm 7b of the leading blade drive lever 7 with a small distance therebetween, as shown in FIGS. 2 and 3, and prevents rotation of the drive lever 7 in the running direction. This prevents the shutter blade from flying out.

後羽根飛出し阻止レバー３１も同様にバネ４・６の力を
受け゛Ｃ２＋１：端ａｉｂが作動レバー３ｏに係合した
状態で停止して、その先端３１ｍが後羽根駆動レバー５
の腕５ｂと微少間隔をもって対向している。The rear blade protrusion prevention lever 31 similarly receives the force of the springs 4 and 6.C2+1: The end aib is stopped in the state engaged with the operating lever 3o, and its tip 31m is applied to the rear blade drive lever 5.
The arm 5b faces the arm 5b with a small distance therebetween.

次にレリーズ操作が行われると先づ電磁石２４のコイル
２６に通電され、アーマチャ２７はヨークに吸引されて
軸２５ａの周りに時計方向に回動する。これにより他端
２７ｍはビンａｏｂを押して作動レバー３０を軸４２の
周りに反時計方向に回動させるので、第４図に示す様に
レバー３０の右端の折曲部３０ａが先羽根飛出し阻止レ
バー３２及び後羽根飛出し阻止レバー３１の腕部８２ｂ
。Next, when a release operation is performed, the coil 26 of the electromagnet 24 is first energized, and the armature 27 is attracted by the yoke and rotates clockwise around the shaft 25a. As a result, the other end 27m pushes the bin aob and rotates the operating lever 30 counterclockwise around the shaft 42, so that the bent portion 30a at the right end of the lever 30 prevents the leading blade from flying out, as shown in FIG. Arm portion 82b of lever 32 and rear blade protrusion prevention lever 31
.

３１ｂを押し、Ｊ：げ各レバーを夫々のバネ４７゜４６
に抗して時計方向に回動させて、その先端部３２ａ及び
３１ａを各駆動レバーの走行阻止位置から退避させ、シ
ャッター走行が可能な状態になる。Press 31b and press each lever to the respective spring 47°46
The tip portions 32a and 31a are retracted from the movement blocking position of each drive lever by rotating clockwise against the movement of the shutter, thereby allowing the shutter to move.

続いて先羽根駆動源１３、後羽根駆動源１２のコイル２
３に、設定されたシャツタ秒時に応じたタイムラグをお
いて順次給電が行われると、前述の様にして駆動レバー
７．５が夫々時計方向に回動し、駆動ビン６．４を介し
て前記アームを作動させシャッター羽根をカ行させる。Next, the coil 2 of the leading blade driving source 13 and trailing blade driving source 12
3, when power is supplied sequentially with a time lag corresponding to the set shutter speed, the drive levers 7.5 each rotate clockwise as described above, and the Operate the arm to move the shutter blades.

先羽根駆動ビン６は走行完了位置直前で、その回動路中
に突出している先羽根保持バネ３６の折曲げ部３６ｍに
当接し、該バネの弾力に抗して折曲部３６ａを乗り越え
た時走行を完了し、第５図に示す様に保持バネ３６によ
って保持される。これと同時に先羽根舟行完了スイッチ
ＩｓＯがビン６に押されてオンとなることにより先羽根
駆動コイル２３への通電は停止される。Immediately before the travel completion position, the leading blade drive bin 6 abuts the bent portion 36m of the leading blade holding spring 36 protruding into its rotation path, and overcomes the bent portion 36a against the elasticity of the spring. When the vehicle completes its running, it is held by the holding spring 36 as shown in FIG. At the same time, the leading blade sailing completion switch IsO is pressed by the bottle 6 and turned on, thereby stopping energization to the leading blade drive coil 23.

後羽根駆動レバー５も先羽根と同様に走行完了位置直前
で駆動ビン４が保持バネ３４に当り、該バネを撓ませて
折曲部完了位置に保持され、後羽根走行完了スイッチの
オンによってフィル２３への通電が断たれる。これと同
時に電磁石２４への通電も停止され、アーマチャ２７は
ヨークより離反し、作動レバー３０を介して走行可能位
置へ移動していた先羽根飛出し阻止レバー３２と後羽根
飛出し阻止レバー３１は夫々戻しバネ４７．４６により
各駆動レバー７．５の回動阻止位置へ復帰する。Similarly to the leading blade, the drive pin 4 hits the holding spring 34 just before the travel completion position, and the spring is bent to hold the rear blade drive lever 5 at the bending part completion position. The power to 23 is cut off. At the same time, the power supply to the electromagnet 24 is also stopped, the armature 27 is separated from the yoke, and the leading blade protrusion prevention lever 32 and trailing blade protrusion prevention lever 31, which had been moved to the driveable position via the operating lever 30, are A respective return spring 47.46 returns each drive lever 7.5 to its rotation-blocking position.

シャッター後羽根の走行が完了すると、公知の手段によ
りフィルム巻上げ動作に入る。第６図はフィルム巻上げ
動作に入った直後の状態を示す図である。巻上機構に連
動する巻上連動軸４８は回転を開始し、回転板４８烏上
のビン４８ｂの図上右から左への移動により復帰レバー
４０の折曲部４０ａ上百が押されると、該レバー４０は
１１１Ｉ４９ａの周りに反時計方向に回動して、その下
端４０ｂでチャージレバー２８の左端部を押し、該チャ
ージレバーを矢印方向へ移動させる。この際チャージレ
バー２Ｂの右端部２８ｃは先羽根駆動レバーγ上のビン
７ａを押し、中間部に設けた切欠縁２８ｂは後羽根駆動
レバー５上のビン５ｍを押す。When the trailing shutter blade completes its travel, film winding operation begins using known means. FIG. 6 is a diagram showing the state immediately after starting the film winding operation. The hoisting interlocking shaft 48 interlocked with the hoisting mechanism starts rotating, and when the upper part of the bent portion 40a of the return lever 40 is pushed by the movement of the bin 48b on the rotary plate 48 from right to left in the figure, The lever 40 rotates counterclockwise around 111I49a, pushes the left end of the charge lever 28 with its lower end 40b, and moves the charge lever in the direction of the arrow. At this time, the right end 28c of the charge lever 2B pushes the bin 7a on the leading blade drive lever γ, and the notched edge 28b provided in the middle part pushes the bin 5m on the trailing blade drive lever 5.

このため各駆動レバー７．５は走行方向とは逆の反時計
方向への回転力を受け、先羽根駆動ビン６及び後羽根駆
動ビン４は強制的に保持バネ３６及び３４の折曲部３６
ｍ、３４ｍを乗り越え、５１！行完了位置での保持は解
除される。引き続く復帰レバー４０の回動により駆動レ
バー１及び５は高速度で走行開始位置へ向って押された
後慣性力と、微弱な復帰バネ４４．４ｆｉの力とにより
走行開始位置に復帰する。復帰レバー４０及びチャージ
レバー２８は巻上連動軸４８が一回転して停止した時不
図示のバネの力で旧位置に戻る。For this reason, each drive lever 7.5 receives a rotational force in the counterclockwise direction opposite to the running direction, and the leading blade drive pin 6 and the trailing blade drive pin 4 are forcibly forced into the bent portions 3 of the retaining springs 36 and 34.
m, overcame 34m, 51! The hold at the line completion position is released. By the subsequent rotation of the return lever 40, the drive levers 1 and 5 are pushed toward the travel start position at high speed, and then returned to the travel start position by the inertial force and the weak force of the return spring 44.4fi. The return lever 40 and the charge lever 28 return to their old positions by the force of a spring (not shown) when the hoisting interlocking shaft 48 makes one rotation and stops.

先羽根駆動レバー７はこの復帰走行の途中で、第７図に
示す様に腕部７ｂが先羽根飛出し阻止レバー３２の側面
３２ｃに当接し、戻しバネ４７に抗して該レバー３２を
押しのけつつ回動し、楚行開始位置の直前で該レバーと
の保合が外れると、阻止レバー３２は戻しバネ４７の力
で回動して再び走行阻止位置に入り込み、駆動レバー７
が復帰時の反動で跳ね返ることを防止する。さらにこの
反動は前述の両レバー間の微少間隔による短い周期の振
動に変換されて急激に１哀され、先羽根駆動レバー７は
静止状態になる。同様にして後羽根駆動レバー５も阻止
レバー３１によって跳ね返りを止 防２されて静止状態になり、第３図に示すシャッター走
行待機状態に戻り、シャッターの一連の作動が終了した
ことになる。During this returning movement, the arm 7b of the leading blade drive lever 7 comes into contact with the side surface 32c of the leading blade protrusion prevention lever 32, as shown in FIG. 7, and pushes the lever 32 away against the return spring 47. When the locking lever 32 is released from the lever just before the plucking start position, the blocking lever 32 is rotated by the force of the return spring 47 and enters the running blocking position again, and the drive lever 7
prevents it from bouncing back due to the reaction when returning. Further, this reaction is converted into a short period vibration due to the minute gap between the two levers and is suddenly stopped, and the leading blade drive lever 7 comes to a stationary state. Similarly, the rear blade drive lever 5 is prevented from rebounding 2 by the blocking lever 31 and becomes stationary, returning to the shutter running standby state shown in FIG. 3, thus completing the series of shutter operations.

（発明の効果） 上述の様に本発明はシャッター走行完了位置に保持され
ているシャッター羽根をフィルム巻上げに連動して押し
戻すことにより強制的に係止を解除して走行開始位置に
迅速に復帰させるので、従来シャッター羽根の戻りが遅
いた唖に上げられなかったモータードライブ時°等の撮
影駒込を大幅に増すことが可能になり、同時にシャッタ
ー羽根の復帰から欠の走行までの時間が充分とれること
によりシャッター精度を安定させることができる。(Effects of the Invention) As described above, the present invention forcibly releases the lock by pushing back the shutter blade held at the shutter travel completion position in conjunction with film winding, and quickly returns to the travel start position. Therefore, it is now possible to significantly increase the number of frames taken during motor drive, which was previously impossible due to the slow return of the shutter blade, and at the same time, there is sufficient time from the return of the shutter blade to the time when the camera stops moving. This makes it possible to stabilize shutter accuracy.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は電磁駆動シャッターの作動原理を説明゛する斜
視図、第２図は本発明実施例を示す斜視図、第３図、第
４図、第５図、第６図、第７図は同実施例における機構
部の各行程における作動状態を示す平面図である。 １ａ〜１　ｅ　ａシャッター後羽根 １’ａ　、　ｌ’ｅ　：シャッター先羽根２　ｇ　３５
２’１　Ｂ’ａシャッター作動アーム４：後羽根駆動ビ
ン ５：後羽根駆動レバー ６：先羽根駆動ビン ７；先羽根駆動レバー １２．１３：電磁駆動源 ２４：電磁石 ２日：チャージレバー ３０！作動レバー ３１：後羽根飛出し阻止レバー ３２：先羽根飛出し■止しバー ３４：後羽根保持レバー ３６：先羽根保持レバー ４０：復帰レバー ４４　、４５：復帰バネ 出　願　人　ギヤノン株式会社Fig. 1 is a perspective view explaining the operating principle of an electromagnetic drive shutter, Fig. 2 is a perspective view showing an embodiment of the present invention, Figs. 3, 4, 5, 6, and 7 are It is a top view which shows the operating state in each stroke of the mechanism part in the same Example. 1a~1e a Shutter trailing blade 1'a, l'e: Shutter leading blade 2 g 35
2'1 B'a Shutter operating arm 4: Trailing blade drive bin 5: Trailing blade drive lever 6: Leading blade driving bin 7; Leading blade driving lever 12.13: Electromagnetic drive source 24: Electromagnet 2: Charge lever 30! Operating lever 31: Rear blade protrusion prevention lever 32: Lead blade protrusion ■ Stop bar 34: Rear blade holding lever 36: Leading blade holding lever 40: Return levers 44, 45: Return spring Applicant: Gearnon Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] 電磁駆動源への通電により駆動部材を介してシャッター
羽根を露光走行させ、走行完了位置で前記通電を断つと
共に、バネ部材により駆動部材を係止してシャッター羽
根を走行完了位置に保持する様にしたシャッターに於て
、フィルム巻上げに連動して前記駆動部材を強制的に走
行開始位置方向へ押し戻して係止を解除すると共に、シ
ャッター羽根を慣性により走行開始位置に復帰させるこ
とを特徴とする電磁駆動シャッター。The shutter blade is exposed to travel through the driving member by energizing the electromagnetic drive source, and the energization is cut off at the travel completion position, and the driving member is locked by the spring member to hold the shutter blade at the travel completion position. The electromagnetic shutter is characterized in that, in conjunction with film winding, the driving member is forcibly pushed back toward the travel start position to release the lock, and the shutter blade is returned to the travel start position by inertia. Driven shutter.