DE3126162C2 - Electromagnetic shutter release - Google Patents

Abstract

An electromagnetic shutter release is described which is designed so that the shutter can be released by means of a small and comparatively weak magnet, the shutter being held securely in the tensioned state by means of a first anchor element in order to prevent the shutter from being hit by a shock or the like .like is triggered unintentionally, the first anchor element being released mechanically at the time of exposure corresponding to the triggering of the camera, the shutter being temporarily held by means of a second anchor element and then triggered electromagnetically.

Description

tent claim 1. Split lamellas 3a, 3b, 3c and 3d form the front

Such a shutter release is from the US-PS ren shutter curtain and are each on two drive ar-

61 338 known. In this shutter release, men are mounted, the base ends of which can be rotated on shafts.

the shutter drive elements are each supported by their own, which are fastened in the base plate 1 in such a way that

Holding elements held that due to the rotation 45 that they perform a pivoting movement. Rear

a curtain control element that is jointly assigned to them has the same structure; however, he is not in

are moved one after the other and thereby the representation of the drawing, since it is behind the base plate

Final drive elements to open or close the 1 is located.

Release the lock. The control element is here a shutter drive element 4 for the front

released by the manual release process and 50 curtain is rotatably mounted on a shaft 31, which at

rotated over a spring. To one is attached for example by the base plate 1 and with one of the

Unintentional displacement of the drive arms caused by vibration, as is not shown in the drawing To avoid final tripping, the control element must be connected by means of a pin 4b, which is connected to the

be held with relatively great force; Lock drive element 4 for the front

Likewise, the holding elements must secure the closing curtain via an arcuate hole Ifc in the

hold the drive elements with considerable force . This base plate 1 is attached . The shaft of the drive arm

leads to the fact that the control element is released or is arranged coaxially with the axis 31. A screw

for the release movement of the holding elements larger force spring 6 to drive the front locking mechanism

te are required, on the one hand a sufficient amount of hanging is loosely wound around the axis 31, with one

Condition the dimensioning of the individual components and 60 end is in engagement with the drive lever 4, while

on the other hand require impact effects which one after the other end is attached to a ratchet wheel 29 that

partial vibration of the camera during the recording is engaged around the axis 31, so that the output

can evoke me. When moving a Haigangsniomcni by a suitable rotation of the locking

teelements by means of an electromagnet this must be set in wheel. The ratchet wheel is in one place

be able to muster a great force. μ held by means of a claw, not shown

The invention has for its object to be adjusted.

electromagnetic shutter release for a ka- Ein Halicclcmeni 8 for holding the front

To create mcruvcrschlussincchanismus, with the Hai-schlusslamellcn is rotatably mounted about the axis 10, the

is fixed in the base plate 1 with an engaging part 8a on the element 8 engaged with the armature 17 of a magnet means explained below, while the end of the arm Sb has an engaging surface 8c. which engages with a projection 4a of the front shutter curtain drive element 4; the element 8 is urged counterclockwise by a soft spring Sd in such a way that the element 8 stands still in the normal case, the engagement part 8a touching a stop (not shown)

The engaging surfaces of the protrusion 4a and the engaging lever are made smooth by polishing or the like, so as to reduce friction at the time of triggering as well to reduce the engagement surface, so that the shutter can be released with a small moment can.

The shutter drive element 5 for the rear shutter curtain is rotatable about the axis 32, the drive spring 7 for the rear shutter curtain and the holding element 9 for the rear shutter curtain are rotatable about the axis 11 fixed in the base plate 1, in the same way as in the case of the Drive fog and the anchor lever for the front shutter curtain are constructed so that on their detailed Declaration is waived.

On a base plate 12 for the control element are actuators 13 and 14 in the form of Magnetic devices for the front shutter curtain and for the rear shutter curtain attached, those at a certain predetermined distance from the base plate by means of the axes mentioned above 10 and 11 are arranged.

15 and 18 are yokes around which coils 16 and 19 are wound. 17 and 20 are anchors which are rotatably arranged on support pins which are provided at one end of the yokes 15 and 18, respectively, with active surfaces 17a and 20a being formed on the other side of the attracting surface. The armature 17 is urged clockwise by a spring, not shown, its rotation being limited by the contact of the active surface 17a of the armature 17 and a pin 21 which is provided on the base plate 12 of the control part, the holding element 8 clockwise by means of the Attack part 8a of the holding element 8 for the front shutter curtain is rotated; this pin is pushed by the active surface 17a when a current flows through the coil 16 and the armature 17 is attracted by the yoke 15. The armature 20 is constructed in the same way as the armature 17, so that when a current flows through the coil 19, the armature 20 is rotated against a spring, not shown, whereby the active surface 20a in contact with the engagement part 9a of the holding element 9 for the rear shutter curtain is brought. A tensioning element in the form of a lever 23 is rotatable about a shaft 24 mounted in the base plate 1 S5 and has the same effect as the first anchor element. The lever has an arm 23c which is in engagement with a clamping element 26 which is provided on the camera side; a locking element 23a is engaged with the pin 4c of the shutter drive element 4 for the front shutter curtain and the arm 5b with the pin 5c of the shutter drive element 5 for the rear shutter curtain. When the lever 23 is rotated about the shaft 24 clockwise by means of a camera-side tensioning element 46, the side surface of the Spcrrelements 23a pushes the pin 4c, so that the lever 4 rotates about the axis 31 for tensioning the shutter drive spring 6, while a not shown Drive arm is rotated by means of the pin 4b so that the front shutter blades 3a to 3d are brought to a portion where the shutter blades cover the exposure opening la. At the same time, the side surface of the locking member 23b pushes the pin 5c of the rear shutter drive member 5 so that it rotates counterclockwise about the axis 32 and tensions the drive spring 7 while the rear shutter curtain is withdrawn from the exposure window.

At the end of the rotation of the clamping element 23, the pins 4c and 5c reach the ends 23d and 23e of the locking elements 23a and 23b and hold aa there.In this state, the rotational force of the locking drive element 4 is via the spring 6 to the center of the release shaft 24 from the pin 4c the locking member 23a is directed so that the rotation of the shutter drive member is stopped. At the same time, the tensioning element 23 is urged counterclockwise by the return spring 25 while the tensioning element 4b of the camera is stationary in the state of engagement with the arm 23c of the tensioning element 23, so that it cannot rotate, so that the shutter drive element 4 for the front shutter curtain is safe by means of the End 23c / of the Sperreleraents 23a is held. The shutter drive element 5 for the rear shutter curtain is also tensioned by the locking element 23Z> of the tensioning element 23 in the same manner as mentioned above, whereby the pin 5c is held in engagement with the end 23e of the locking element 23i>.

The clamping element 4b on the camera side can be used as part of the mechanism for driving a movable mirror 40 in the one-eyed mirror. Be designed as a single lens reflex camera, as shown in FIG. 3 is shown.

In the drawing, the movable mirror 40 is rotatable held on the shaft 40a in the camera, with the pin 41 attached to one side of the mirror 40 is. A mirror drive lever 42 engages the pin 41 and is rotatably supported about the fixed axis 43. A mirror drive lever 44 is rotatably supported about the axis 43, with ao upper end one end a mirror drive spring 45 is mounted such that, while the lever 44 is about the axis 43 clockwise is rotated, the spring 45 is tensioned. 46 is an arm attached to the drive lever 44, the end of which can be brought into engagement with the arm 23c of the tensioning element 23. One attached to the lever 44 Shaft 48 rotatable armature lever 47 is urged clockwise by a spring 49, the hook portion 47a is brought into engagement with the mirror drive lever 47 at its end. A clamping lever 50 is in Operational connection with an elevator mechanism, not shown, and is rotatable about the axis 51, being one arm 50a is engaged with the uliteren end of the mirror drive lever 44, while the other End 50f> with the armature lever 52 is in engagement.

The armature lever 52 is held rotatably about the axis 53 and urged clockwise by the spring 52 ', whereby its end 52a is in engagement with the lever 50. A shoulder end 52b forms an armature to be attracted by the magnet 54. 55 is a spring for driving a magnetic shutter mechanism, not shown. which is tensioned by the counterclockwise rotation of the lever 50.

A lever 56 is used to return the mirror when the shutter has expired; it is about axis 57 rotatably supported, urged clockwise by the spring and is in contact with the stop. At

the point at which the lever 56 stops, the pin 58 attached to the lever 56 lies opposite the one arm 47b of the lever 47.

In the following, the mode of operation of the exemplary embodiment explained above will be explained.

The drawing shows the state in which the shutter is cocked. The locking elements 23a and 23b of the tensioning element 23 are at the ends 23c / and 23e with the pins Ac and 5c of the shutter drive element 4 for the front shutter curtain and the shutter drive element 5 for the rear shutter curtain in engagement, so that they the sequence of the front and rear Stop the shutter curtain. At this time, the engaging surface of the front curtain driving member together with the engaging projection 5a of the rear curtain driving member 5 oppose the ends 8c and 9c of the holding members 8 and 9 at a small distance.

When a current is passed through a shutter release button shown in FIG. 3 magnets, not shown flows, the armature lever 52 is about the axis 53 against the spring 52 'by the attractive force of the Magnet rotated so that the lever 50 is released. Thus, the lever 50 is driven and about the axis 51 is rotated clockwise so that the automatic shutter device, not shown, is operated. then the lever 44 is rotated about the axis 43 by the spring 45 counterclockwise, during the Mirror drive lever 42, which is in engagement with the armature lever 47 held on the lever 44, also in FIG the same direction is rotated, the lever 42 pushes the pin 41 of the mirror so that the Mirror 44 rotates in the direction of the arrow about axis 40a and the mirror is withdrawn from the photographic light path will.

At the same time, one arm 46 of the mirror 44 is turned off the one with solid lines in FIG. Section 46 shown in FIG. 2 in the one shown with dashed lines Section 46 'moved.

Consequently, the tension member 23 is rotated counterclockwise by the return spring 25, so that the shutter drive elements 4, 5, which are held by the first anchor element, released will.

Thus, the shutter drive member 4 for the front shutter curtain and the shutter drive member 5 for the rear shutter curtain turned a little clockwise, whereby the projections 4a and 5a held again and brought into contact with the ends 8c and 9c of the holding elements 8 and 9 will.

Then, when the mirror has swung up, a start signal for the front shutter curtain is emitted by the camera and current is supplied to the coil 16 of the actuating device 13 for the front shutter curtain from a control circuit (not shown); the armature 17 is attracted by the yoke 15, so that it is rotated about the shaft \ 7b counterclockwise. As a result of this rotation, the action element 17a is immediately brought into contact with the engaging part 8a of the front holding element 8, so that the latter is rotated about the axis 10 against the force of the spring Sd. The attack part 8a stops, as shown in the + eichnung, at a certain predetermined distance in contact with a stop, not shown, a small gap between the active surface 17a of the anchor and the attack remains steep 8a, so that the anchor, which gradually has been accelerated by the attractive force of the actuating device 13, strikes the attack part 8a, whereby the Helteelcmenl is rotated by the relatively small attractive force of the magnet of the actuating device, so that the locked shutter drive element 4 is released for the front shutter curtain. At the same time, the shutter drive element 4 for the front shutter curtain begins a clockwise rotation; this rotation is transmitted to the drive arm for the front shutter curtain, not shown, through the drive pin 46 for the front shutter curtain, so that the divided front shutter blades 3a, 3b, 3c and 3d begin their sequence to open the exposure window la and to start the exposure.

After a certain predetermined time has elapsed from the time of supplying power to the control magnet for the front shutter curtain is current of the coil 19 of the control magnet for the fed to the rear curtain, whereby the armature 20 is attracted to the yoke 18. Thus pushes in the same way as the front curtain, the active surface 20a of the armature 20, the attack part 9a of the Retaining element 9 of the rear shutter curtain so that it rotates clockwise. At this time is the upper part 9c of the support element 9 for the rear Shutter curtain out of engagement with the anchor projection 5a of the shutter drive lever 5 for the rear Shutter curtain, whereby the split shutter blades not shown in the drawing their Start the sequence for closing the exposure opening la and end the exposure.

When the completion of the operation of the rear shutter curtain has been detected by means of a detection device not shown and current is supplied to the magnet 60 shown in Fig. 3, the upper part 56a of the lever 56 is attracted by the magnet 60, whereby the lever 56 about the axis 57 is rotated counterclockwise against the force of the spring 59. Thus, the pin 58 pushes one arm 47b of the armature lever 47 so that the arm 47b rotates about the axis 58 against the force of the spring, so that the end 47a is brought out of engagement with the mirror drive lever 42, whereby the mirror is in its original position occupies by means of a spring, not shown

When the winding process is then carried out by means of a conventional tensioning lever, the lever 50 shown in FIG of the lever 44 is pushed by one arm 50a and then fixed by the other arm 50b by means of the anchor lever 52. In operative connection with this rotation, the lever 44 is rotated clockwise about the axis 43 in order to tension the spring 45, whereby the armature lever 47 is brought into engagement with the mirror drive lever 42 again. On the other hand, the arm 46 is moved upward in FIG. 2 shifted, whereby the clamping element 23 is detected by the arm 23c, so that it is rotated about the shaft 24 clockwise. Thus, the locking element 23a or 23b is brought into engagement with the pin 4c or 5c, so that the shutter drive elements 4 and 5 for the front and rear shutter curtain are rotated about the axes 31 and 32 counterclockwise and the drive springs 6 and 7 be excited. Furthermore,

10

15th

20th

25th

30th

together with the rotation of the locking drive elements 4 and 5, drive arms, not shown, are rotated by pins 46 and 56 so as to close the shutter curtains in the position before exposure. At the end of the locking process, the pins slide 4c and 5c to the ends 23c / and 23e of the locking elements 23a and 23b high, whereby the shutter drive elements 4 and 5 stop rotating, so that the shutter cocking operation is terminated.

At this time, the rotation of the shutter drive members 4 and 5 stopped via the pins 4c and 5c by means of the clamping element 23, whereby, since the arm 23c of the tensioning element is in engagement with the tensioning element 26, the rotation of the tensioning element 23 is stopped against the force of the return spring 25, so that the shutter drive elements 4 and 5 for the front or rear shutter curtain are securely held in the tensioned position.

4 shows a variation of the actuating device wherein a spring is provided such that a certain gap between the armature and the engagement part remains on the holding member in the state in which no current flows through the coil.

In the drawing, the same elements as in FIG. 1 have the same reference numerals.

The coils 16 and 19 are wound around yokes 15 and 18 are; Anchors 17 and 20 are rotatably mounted on axles 176 and 206 in some of the yokes. On a part the armature 17 and 20 are devices 35 and 36 like very soft leaf springs made of a magnetic Body, such as bronze, so firmly attached that the attractive surfaces 17c and 20c be kept from the attractive surface of the yoke.

21 'and 22' are stops for the active surfaces 17a and 20a of the anchor, the point at which the active surfaces be stopped, is adjustable by means of a screw.

On the holding elements 8 and 9 engagement parts 8a and 9a are provided, which are drawn by means of springs Sd and 9c /, with which they are brought into contact with the side surface of the base plate 12 of the control part, that a certain predetermined gap between the active surfaces 18a and 20a remains

When current flows through coil 16, the area 17c of the armature attracted by the yoke 15. Since the elasticity of the spring 35 is extremely soft, this is too At the time, the attraction of the anchor is very high. When the tightened anchor is around axis 176 is rotated, the active surface 17a moves over a certain distance, which is predetermined by the stop 21 ' until it is brought into contact with the attack device 8a.

Since this reduces the gap between the yoke 5 and the armature 17c, the attractive force becomes between them gradually increased, so that the effective surface 17a of the armature, which is accelerated, firmly in the direction of the arrow strikes against the engaging part 8a. Thus, the shutter drive element 4 for the front shutter curtain brought out of engagement with the holding element 8, so that the front shutter curtain his Sequence begins When current flows through coil 19 in the same way as in the previous case, the Armature 20 rotated and strikes in the direction of the arrow on the engagement part 9a, so that it is out of engagement with the lock drive element 5 is brought for the rear shutter curtain and the rear shutter curtain enables the process

The armature remains attracted to the yoke until no more current flows through the coil, with the leaf spring is provided between the attractive surfaces so that the air gap is maintained, the anchor can easily adopt its original state due to the low elasticity of the leaf spring when the power supply to the coil is cut off even if residual magnetism remains.

In the case of the present embodiment, the magnet is provided with a spring, which serves to to bring the anchor into a position a certain distance before the position in which the anchor is on the engagement part of the holding element acts when the power supply to the coil is interrupted, so that one a "hammer effect" is obtained, which takes advantage of the inertia of the armature, which is due to the power supply to the Has moved the coil and strikes against the engaging part of the holding element; this has the result that in comparison with the case in which a gap is not provided, the current that is necessary for this is the holding element to disengage to 'Λ to Vb the size of the previously required current can be reduced. Thus, when a current of the same magnitude is supplied to the coil there remains space for the drive torque of the magnet, so that the magnet is made smaller can be, thereby improving the locking accuracy.

For this purpose 3 sheets of drawings

Claims (4)

1 2 teelemente for shutter drive elements with low claims: force can be actuated, and it is nevertheless ensured that no unintentional shutter release occurs. 1. Electromagnetic shutter release for your own can. nen camera shutter mechanism, the shutter 5 This object is achieved according to the invention by the includes drive elements, each of which has its own characteristics in the characterizing part of the main Holding elements are held or released, saying solved. characterized by locking elements (23a, locking elements according to the invention are provided here 23AJl which in the tensioned state the locking device, which in addition to a tensioning function for safe blocking First block drive elements (4, 5) and then serve io kierung of the shutter drive elements, wherein release for a recording, while this is still for recording the holding elements after the release are held by their holding elements (8, 9), and by the locking elements independently of these are moved individually by the holding elements (8,9) to their own actuating devices, which ordered actuating devices (13, 14), also unaffected by their locking elements which the holding elements (8,9) carry out 15 functions independently of one another, are movable. Developments of the invention are the subject of 2. Electromagnetic shutter release according to dependent claims. Claim 1, characterized in that the actuating embodiments of the invention are following- supply devices (13, 14) magnetic devices based on schematic drawings in detail are. 20 explains it shows 3. Electromagnetic shutter release according to FIG. 1 is a perspective view of a closure, Claim 1 or 2, characterized in that the F i g. 2 a part of the closure in plan view, wherein Locking elements (23a, 23b) parts of a tensioning element, the magnetic device is not shown, (23) of the clasp are. F i g. 3 is a perspective view of the drive mechanism of the 4. Electromagnetic shutter release after 25 mirrors of a single-lens reflex camera, in which one of the preceding claims, characterized in that the closure according to the invention is used, and indicates that the actuating devices (13, F i g. 4 in plan view of a second embodiment of the 14) Armature (17,20) with active surfaces (17a, 20aJaufwei magnet device. sen, which attack parts (8a, 9a) on the holding elements- The F i g. 1 and 2 show a shutter base plate 1, th (8, 9) are assigned, and that devices 30 which are in their center with an exposure opening la verse (21 ', 35; 22', 36) are provided so that in the non- hen is. A cover base plate 2 is provided with a certain released state of the closure between the ante distance from the closure base plate opposite handle parts (8a, 9a) and the active surfaces (17a, 20a,) of these, the cover plate 2 having a predetermined distance. Drawing has not shown exposure aperture, 35 which is opposite the opening la. Between the Base plate 1 and the cover plate 2 is the lock with a front and rear shutter curtain, which consists of a multitude of thin impermeable lamellas The invention relates to an electromagnet, arranged so that it opens the opening see shutter release according to the preamble of Pa-40 or closes.