Photographic camera with shutter blade system executing reciprocating motion during exposure

Claim 2

A photographic camera with shutter including a shutter blade system for covering the lens aperture of said camera and executing a reciprocating motion during the exposure period; a permanent magnet mounted on said shutter blade system and participating in the motion of said shutter blade system; said permanent magnet having one end with one pole mounted on said shutter blade system nd having the free end with the other pole extending from said shutter blade system; an electromagnet capable of polarity reversals, and electronic timing means controlling the polarity of said electromagnet, said electromagnet having two opposing poles providing a magnetic field therebetween, said permanent magnet being mounted on said shutter blade system with said free end with said other pole of said permanent magnet projecting into the magnetic field of said electromagnet, said free end of said permanent magnet with said other pole being engageable with the opposing poles of said electromagnet, said electromagnet being U-shaped with said opposing poles using positioned to engage said permanent magnet to hold said shutter blade system in the open position when one of said poles of said electromagnet is engaged by said free end of said permanent magnet, and to hold said shutter blade system in the closed position when the other of said poles of said electromagnet is engaged by said free end of said permanent magnet.

Claim 3

The photographic camera of claim 1, wherein said shutter blade system comprises a single pivoted and swivable blade, said single blade being the direct mounting for said permanent magnet.

Claim 4

The photographic camera of claim 2 wherein said shutter blade has extended surface to which said permanent magnet is mounted.

Claim 5

The photographic camera of claim 1 wherein said shutter blade system comprises a plurality of shutter blades movable by means of a common driving member, and said permanent magnet is mounted to said common driving member.

Claim 6

The photographic camera of claim 1 wherein said pole of said permanent magnet alternately engages the poles of said electromagnet during the opening and closing of said shutter blade system, the distance between the poles of said electromagnet being related to the path of motion of said permanent magnet such that said pole of said permanent magnet engages a corresponding pole of said electromagnet at each end of its path of motion.

Claim 7

The photographic camera of claim 1 wherein said electronic switching device comprises a contact switch to control the current through said electromagnet, and a pushbutton to actuate said contact switch and being adapted to release said camera.

Claim 8

A photographic camera with shutter comprising: a shutter blade system covering the lens aperture of said camera and executing a reciprocating motion during the exposure period; a permanent magnet coupled to said shutter blade system, and participating in the motion of said shutter blade system; an electromagnet capable of polarity reversals; and an electronic switching device controlling the polarity of said electromagnet, said electromagnet being associated with respect to said permanent magnet so that one pole of said permanent magnet projects into the magnetic field of said electromagnet and wherein said electronic switching device comprises a contact switch to control the current through said electromagnet, and a pushbutton to actuate said contact switch and being adapted to release said camera and wherein a lever acted upon by a spring follows the motion of said pushbutton and actuates said electronic switching device.

Claim 9

A photographic camera with shutter comprising: a shutter blade system covering the lens aperture of said camera and executing a reciprocating motion during the exposure period; a permanent magnet coupled to said shutter blade system, and participating in the motion of said shutter blade system; an electromagnet capable of polarity reversals; and an electronic switching device controlling the polarity of said electromagnet, said electromagnet being associated with respect to said permanent magnet so that one pole of said permanent magnet projects into the magnetic field of said electromagnet and wherein said electronic switching device comprises a contact switch to control the current through said electromagnet, and a pushbutton to actuate said contact switch and being adapted to release said camera and wherein a lever acted upon by a spring follows the motion of said pushbutton and actuates said electronic switching device.

Claim 10

The photographic camera of claim 7 wherein said lever possesses a locking device acting upon sAid pushbutton to prevent the pushbutton from returning to its starting position prior to the termination of the executing period of said shutter.

Claim 11

The photographic camera of claim 8 wherein an actuating device settable by said shutter blade system, is associated with said contact lever to guide and move said lever out of the locking position when said shutter blade system returns to the starting position.

Claim 12

The photographic camera of claim 9 wherein said actuating device comprises: a connecting rod; a projection on said pushbutton; a spring acting on said connecting rod to retain one end of said rod engaged with said pushbutton projection; a two-armed rocker lever coupled by means of one arm to the other end of said connecting rod; and a spring acting on said rocker lever to retain the other arm of said rocker lever bearing against said shutter blade system.

Claim 13

A photographic camera with shutter comprising: a shutter blade system covering the lens aperture of said camera and executing a reciprocating motion during the exposure period; an electromagnet capable of polarity reversals; a contact switch controlling an electronic switching device, the latter controlling the current through said electromagnet; a pushbutton actuating said contact switch and being adapted to release said camera; a spring acting upon a lever to follow the motion of said pushbutton; a locking device associated with said lever and acting upon said pushbutton to prevent the pushbutton from returning to its starting position prior to termination of the executing period of said shutter; a connecting rod; a projection on said pushbutton; a spring acting on said connecting rod to retain one end of said rod engaged with said pushbutton projection; a rocker lever coupled to said connecting rod; a spring acting on said rocker lever to retain said rocker lever in contact with said shutter blade system; and a permanent magnet coupled to said shutter blade system, and participating in the motion of said shutter blade system, said permanent magnet having only one of its poles alternately engaging the poles of said electromagnet during the opening and closing of said shutter blade system, the distance between the poles of said electromagnet being related to the path of motion of said permanent magnet such that said pole of said permanent magnet engages a corresponding pole of said electromagnet at each end of its path of motion.

Claim 14

A photographic camera with shutter comprising: a shutter blade system covering the lens aperture of said camera and executing a reciprocating motion during the exposure period; an electromagnet capable of polarity reversals; a contact switch controlling an electronic switching device, the latter controlling the current through said electromagnet; a pushbutton actuating said contact switch and being adapted to release said camera; a spring acting upon a lever to follow the motion of said pushbutton; a locking device associated with said lever and acting upon said pushbutton to prevent the pushbutton from returning to its starting position prior to termination of the executing period of said shutter; a connecting rod; a projection on said pushbutton; a spring acting on said connecting rod to retain one end of said rod engaged with said pushbutton projection; a rocker lever coupled to said connecting rod; a spring acting on said rocker lever to retain said rocker lever in contact with said shutter blade system; and a permanent magnet coupled to said shutter blade system, and participating in the motion of said shutter blade system, said permanent magnet having only one of its poles alternately engaging the poles of said electromagnet during the opening and closing of said shutter blade system, the distance between the poles of said electromagnet being related to the path of motion of said permanent magnet such that said pole of said permanent magnet engages a corresponding pole of said electromagnet at each end of its path of motion.

Claim 15

A photographic camera with shutter comprising: a shutter blade system covering the lens aperture of said camera and executing a reciprocating motion during the exposure period; a contact switch; an electronic switching device; a pushbutton actuating said contact switch and being adapted to release said camera; a lever acted upon by a spring to follow the motion of said pushbutton; a locking device associated with said lever and acting upon said pushbutton to prevent the pushbutton from returning to its starting position prior to the termination of the executing period of said shutter; an actuating device associated with said lever and coupled to said shutter blade system, to guide and move said lever out of the locking position when said shutter blade system returns to the starting position; a permanent magnet coupled to said shutter blade system, and participating in the motion of said shutter blade system; and an electromagnet controlled by said electronic switching device, the latter being activated by said contact switch and having its poles alternately engaged by (a) only one pole of said permanent magnet during the opening and closing of said shutter blade system, the distance between the poles of said electromagnet being related to the path of motion of said permanent magnet such that said pole of said permanent magnet engages a corresponding pole of said electromagnet at each end of its path of motion.

Claim 16

A photographic camera with shutter comprising: a shutter blade system covering the lens aperture of said camera and executing a reciprocating motion during the exposure period; a contact switch; an electronic switching device; a pushbutton actuating said contact switch and being adapted to release said camera; a lever acted upon by a spring to follow the motion of said pushbutton; a locking device associated with said lever and acting upon said pushbutton to prevent the pushbutton from returning to its starting position prior to the termination of the executing period of said shutter; an actuating device associated with said lever and coupled to said shutter blade system, to guide and move said lever out of the locking position when said shutter blade system returns to the starting position; a permanent magnet coupled to said shutter blade system, and participating in the motion of said shutter blade system; and an electromagnet controlled by said electronic switching device, the latter being activated by said contact switch and having its poles alternately engaged by (a) only one pole of said permanent magnet during the opening and closing of said shutter blade system, the distance between the poles of said electromagnet being related to the path of motion of said permanent magnet such that said pole of said permanent magnet engages a corresponding pole of said electromagnet at each end of its path of motion.