Electromagnetically driven shutter
AssigneeCanon Kabushiki Kaisha
InventorsYoji Sugiura, Nobuaki Date
Life of this patent
Estimating the term…
Abstract
A focal plane shutter mechanism for a single lens reflex camera has its shutter blades driven by an electromagnetic driving source, with setting of shutter blades to their running start positions being mechanically effected in association with mirror driving means thereby diminishing power consumption, and with the shutter blades being electromagnetically driven only during a film exposure.
Claims9
An electromagnetically driven shutter mechanism for a single lens reflex camera having a mirror and mirror driving means, comprising:
- (a) an electromagnetic driving source;
- (b) shutter blades;
- (c) shutter blade driving means coupled with said electromagnetic driving source to run said shutter blades for effecting film exposure;
- and
- (d) a setting member engaged with said shutter blade driving means to set said shutter mechanism and to retain said shutter blades at their running start positions, said setting member being operatively associated with said mirror driving means of said camera and being actuated for setting said shutter, said setting member also releasing retention of said shutter blades when said mirror is actuated preceding a film exposure.
An electromagnetic shutter mechanism for a single lens reflex camera which includes a mirror movable between a viewing position and a film exposure position comprising:
- shutter blade means operable between a first position and a second position to effect film exposure in said camera;
- electromagnetic means for driving said shutter blade means from said first to said second position;
- lever means responsive to actuation of said camera to effect an exposure operation for moving said mirror from said viewing position to said film exposure position;
- and
- means operatively associated with said lever means for mechanically returning said shutter blade means to said first position and for checking movement of said shutter blade means at said first position until a subsequent exposure operation of said camera.
Dependencies are inferred from the claim text.