Patent ID: 6503001
Filing Date: 2003-01-07
Classification: G03B

Abstract:
A camera shutter driving mechanism mounted in a camera frame adjacent to a film cartridge chamber thereof for driving a shutter blade of the camera into a closed or an open position to respectively shield or expose a shutter opening formed on the camera frame, comprising:a shutter release button mechanism having an shutter release button; a film-driven ratchet mechanism being associated with a film-driven sprocket wheel, said film-driven sprocket wheel being partially projected into a film passage formed in said camera frame to mesh said film-driven sprocket wheel with at least one sprocket hole formed on a film extended through said film passage and thereby being driven to rotate by said film when the film is displaced along said film passage, and said film-driven sprocket wheel in rotating being adapted to bring said film-driven ratchet mechanism to rotate; a shutter release sensing mechanism being located adjacent to said film-driven ratchet mechanism to be driven to rotate by said film-driven ratchet mechanism, so as to convert an axial pressure applied on said shutter release button mechanism into a rotary force to act on a pull arm; and a link being movably set in a horizontal channel provided in said camera frame, and having a first end connected to said pull arm of said shutter release sensing mechanism and a second end connected to a pullback spring fixed in said camera frame, said link being provided near a middle part of a front side facing toward said shutter blade with a protrusion adapted to touch and move said shutter blade; whereby when said film is moved through said film passage and drives said film-driven ratchet mechanism to rotate, said shutter release sensing mechanism and said pull arm thereof are caused to rotate by a predetermined angle to move said link toward said first end in a first direction until said film has been moved by a predetermined distance and said shutter release sensing mechanism is stopped from rotating any further; and when said shutter release button of said shutter release button mechanism is pushed, said shutter release sensing mechanism is descended to separate from said film-driven ratchet mechanism, allowing said pullback spring to pull said link toward said second end in a direction opposite to said first direction and said protrusion on said link to push against and pivotally turn said shutter blade by a predetermined angle from said closed position into said open position, so that said shutter opening is opened for a very short time.