1982-03-01
1983-11-15
Adams, Russell E.
354264, G03B 922
Patent
active
044152523
ABSTRACT:
An electromagnetically operated shutter includes a conductive member which has a number of radial components from the center of rotation of a sector ring, and is arranged on a plane parallel with the sector ring. The conductive member is secured to the sector ring, and a Lorentz force is generated by a magnetic field in the direction of the photographing optical axis, which force is applied to the conductive member so that the sector ring is caused to rotate to open and close the photographing optical path with a set of shutter blades. The radial components of the conductive member are arranged to be long by concentrating them in the vicinity of the diagonal lines of a rectangular space within a camera, and the conductive member is arranged to be rotatable within a predetermined angle range in this vicinity. The conductive member can be formed into a printed pattern which is arranged to increase, within a limited coil length, the length of the effective portion thereof for generating the Lorentz force. To stabilize the operation of the shutter, a spring is provided which urges the sector ring to move in the direction of shutter closing, and the total amount of the Lorentz force on the sector ring is arranged to increase as the shutter opens.
REFERENCES:
patent: 3654845 (1972-04-01), Fahlenberg et al.
patent: 3987473 (1976-10-01), Kondo
patent: 4024552 (1977-05-01), Kondo
patent: 4079400 (1978-03-01), Kondo
Hirohata Michio
Ogawa Yukio
Adams Russell E.
Canon Kabushiki Kaisha
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