DD206251A1 - MAGNETIC SYSTEM FOR PHOTOGRAPHIC CAMERAS - Google Patents

Abstract

The invention relates to a magneto-optical system for photogra- phic cameras with an impulse-controlled permanent magnet and at least one electromagnet for releasing the camera and for closing the shutter. THE OBJECT AND OBJECT OF THE INVENTION IS TO EASILY PREVENT DUST STORAGE ON THE PLANTS BETWEEN IMPULSE-CONTROLLED PERMANENT MAGNETS AND THEIR ANCHORS, AND TO RESTORE THE OR THE ANCHORS OF THE OR THE ELECTRICITY MAGNETS AFTER EXPOSURE TERMINATION INDEPENDENTLY TO THE WORKING POSITION. ERFINDUNGSGEMAESS IS THIS TASK BY SOLVED THAT AN ANCHOR OF THE PULSE-DRIVEN PERMANENT MAGNET AS SOON AS HIS AUSLOESEFUNKTION AUTOMATICALLY IN ITS INITIAL PHASE RUECKKEHRENDES COMPONENT AND AN ANCHOR OF ELECTRIC HOLDING MAGNETS THAN LOCK LIFT IN ITS INVESTMENT on the magnet SUCCEEDED END COMPONENT TRAINED IS BEING FOR BOTH ANKERRUECKFUEHRUNGEN A COMMON ACTUATOR APPLICATION FINDS.

Description

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Dresden, on March 29, 1982, 21 / 4-03

Title of the invention; , , , Magnetic system for photographic cameras Application of the invention

The invention relates to a magnet system for such photographic cameras, in which at least one pulse-controlled permanent magnet and at least one El.ekiroh.altemagnet are used for camera release and / or shutter actuation.

Char aid: eri s tile of well-known technical solutions

Magnetic systems are known for cameras in which the dropped armature of impulse magnets are re-applied to the magnet yokes during clamping of the shutter. (DS-AS 25 04 5.66) ♦ It is also known that the fallen armatures are returned to the magnets by means of an electric motor attributed (DE-AS 11 78 694) or to arrange the electromagnetic tripping device in a housing made of non-magnetic material (DE-AS 25 30 623) ο

Magnetic systems of the former type are sensitive to dust, since their armatures are sometimes separated from the magnet yokes for a very long time until renewed closure periods, so that the magnetic Haitekraft can deposit very strongly on this dust and metal particles.

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encapsulated magnet systems, by which the mentioned shortcomings should be avoided, -. are too expensive for the intended purpose. The same applies to the motor armature feedback.

Aim of the invention;

With the invention, an improved magnet system to be created _e

Explanation of the essence of the invention

The object of the invention is the design of a magnetic system for photographic cameras with at least one .im.pul.sge steered permanent magnet and. at least one magnetic holding magnet, wherein the dust deposit on the magnets and the former, without the same having a shielding housing. . umgeben. .- be avoided »In addition, the Slektrohaltemagnet should be in a simple manner in its operating position for shutter actuation *

According to the invention, this object is achieved in that an armature of the pulse-controlled permanent magnet is used as the

IQ indirectly according to its triggering function automatically in its initial position returning device and an armature of the magnet holding magnet as in Yerschiußaufzug in his system at Magnetj och gelängendes component is formed, for both armatures return a common actuator application applies An anchor lever said first armature is in the range of one arranged with camera release releasable Kameragligdes that is preferably from a central actuator structure, in the area of action also at least one anchor lever for manual return of the armature to the

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Electro-holding magnet is « execution; see game

The invention will be explained with reference to an illustrated embodiment «show it:

Pig · 1 Entire magnet system in ready-to-operate state Pig »2. Pulse magnet system during camera release Fig. 3 Pulse magnet system after camera release

Pig «4 Electric holding magnet system immediately before shutter release

Pig. 5 Electric holding magnet system after exposure completion before shutter lift »

According to, Pig ,,,, 1 is a pulse-controlled permanent magnet 1, a. Electro-holding magnet 2 and another 31 ektrohaltemagneten 3 Z e an anchor 4 $ 5 and β assigned, the latter with anchor levers 7, 8 and 9 form a structural unit »On the axis of rotation 10 of the armature lever 7 is loaded with a peder 11 pawl 12 is mounted , which on the one hand with a cloth 13 and on the other hand with a ·. Rag 14. Collaborated The Rag. 14 is stock. part of a with a 'roll 15.versehenen clamping lever 16, which has a resting on a roll 17 hare. 13 with a, loaded by a peder 19 central actuator 20, is in communication and can be locked by means of the pawl 12 in its clamping position »anchor lever 7 and clamping lever 16 are interconnected via a spring 21.

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prevented. With 22, 23 are Antri.ebshebel for opening and. Closing the closure and with 24> 25 associated} with spring 26, 27 loaded pawls referred. The armature lever 8, drive lever 23 and the pawl 24 are not completely shown in FIG. 1 for better clarity. "The pawl 24 is provided with a bolt 28 and the central actuator with further rollers 29, 30." The drive lever 23 is coaxially au Pawl 12 arranged »The anchor levers 8 and 9 are loaded with springs 31 and 32« 33 is a role on the drive lever 23 denotes, which lies in the range of action of the actuator 20. Under the latter and equiaxial to this one is. Rubber element 34 is arranged.

The overall system illustrated in FIG. 1 is reduced in each case to the parts necessary for understanding the function in FIGS. 2 to 5.

The mode of operation is explained starting from the starting position shown in Fig _e 1, in which the armature 6 is automatically held by the .impulsgesteuerten permanent magnet 1 and the armature, 4 and 5 via the armature lever 8 and 9 by means of the actuator 20 to the yokes of the still de-energized .Shaltmagnethaltemagnete 2 and 3 are applied. When a Ausl.ö not shown seschalt ers, arranged on the camera or in a handle for remote triggering, the Slektrohaltemagnete 2 and 3 are activated. At the same time by a current pulse from the pulse-controlled permanent magnet. Weakened 1 applied magnetic holding force, so that under the action of the spring 21 of the armature lever · 7 connected anchor ο drops _o Here the flap 13 hits the

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Pawl 12, so that it is pivoted against the action of the spring 11 and thereby releases the clamping lever 16 (Pig * 2) ·. Under the action of the spring 19 now runs the central actuator 20 in a clockwise in. Its relaxed position in which it releases the armature and drive lever 8, 9, 22 and 23 and a mirror mechanism, not shown, by the roller 29 of the armature lever 9 and the Actuator 20 runs away from the roller 33. Simultaneously, the returning central actuator 20 via the roller 17 drives the clamping lever 16 back, which in turn via the roller 15 the. Anchor lever · 7 entrains and thus brings the armature 6 immediately after camera release again on the pulse-controlled permanent magnet 1 to the plant (Fig. 3) β The armature 6 is thus only for milliseconds in the waste position, so that no contact to the contact surfaces of armature and pulse magnet magnetic holding force can weaken weakening dust or metal particles ·

After this return of the central actuator 20 Blektrohaltamagnet 2 is first turned off and thus the armature 4 is released with anchor lever 9. The latter actuates the pawl 25 "so that the drive lever 22 is released for the leading Yerschlußglied and the Ver-conclusion is opened» Uach expiry of a known manner; electronically-formed 'delay time will also de-energize the agnet 3 electrostatic current-holding. As a result, its armature 5 drops off and over the armature lever 8, the pawl 24 is actuated so that the drive lever 23 for the trailing "closure member can move counterclockwise, causing the exposure to 3n.de * The shutter is now in expired Condition, (Fig.), ..

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In order to bring the camera back into the ready-to-trigger starting position, the clamping lever 16 must be pivoted from the position shown in Pig, 3 clockwise

 In this case, on the one hand a tensioning of the spring 21 and on the other hand against the action of the spring 19 a

Reverse rotation of the central actuator 20, whereby the drive lever 22, 23 biased and the armature levers 8 and 9 are returned, so that the armature 4 and 5 again come to rest against the electric holding magnet 2, 3 At the end of this clamping operation of the clamping lever 16 through the Lobe 14 of the pawl 12 snapped (Pig * 1),

The central actuator 20 thus fulfills a Mehrfachfunktiono On the one hand it provides after camera release for the immediate automatic return of the armature, the dust-sensitive pulse magnet and the other for the mechanical Dearretierung the electromagnetically held armature of Elektrohaltemagneten immediately before Yerschlussauslösung and for, re-investing said anchor in camera lift.

The magnet system according to the invention can of course also be used in such cameras whose Yerschlußauslö3ung without a Slektrohaltemagneten 2, that is purely mechanical. In this case, it is only necessary to ensure that the compensation of the armature decay time of the magnet holding magnet 3 takes place in another suitable manner.

Claims (2)

239239 4 claim for invention 1. Magnetic system for photographic cameras in which at least one pulse-controlled permanent magnet and at least one Elektrohaltemagnet are used for camera release and / or closure operation, characterized in that an armature (β) of the pulse-controlled permanent magnet (1) as immediately after its triggering function automatically in his Starting position returning component and an armature (4, 5) of the electric holding magnet (2, 3) is formed as a closing elevator in his system at Magnetj och reaching component, wherein a common actuator (20) is used for both armature feedback · Magnetic system according to item 1, characterized in that armature levers (7, S _t 9) of said magnets (1, 2, 3) are mechanically released in the area of action of the locking mechanism mechanically released in its spring-loaded starting position and released with camera release Locking of the armature lever of the lead holding magnet releasing and are arranged in .Verschlußaufzug against the spring action to be reset actuator «, (For this 5 sheets of drawings)