Electrical shutter for camera

An electrical shutter for a camera comprising a shaft, a prime mover spring for driving said shutter, a charging member which rotates about said shaft in response to a film winding operation to charge said prime mover spring, said shutter having shutter blades movable between an open and a closed position, a shutter drive member for opening or closing the shutter blades by rotating substantially through one revolution under the resilience of said prime mover spring in response to an electromagnetic release operation, a first detent member for maintaining the shutter drive member stationary at a start position before the shutter is operated, a second detent member which is selectively movable between positions engageable with and disengageable from the shutter drive member as the latter rotates to open the shutter blades for temporarily maintaining the shutter blades in an open condition to thereby determine the length of the exposure period, detent drive means for urging said first and second detent members to move away from the shutter drive member as the shutter drive member rotates, and an electrical shutter circuit including a first shutter release magnet which operates the first detent member to control the shutter closing operation, the electrical shutter circuit including means for automatically controlling the time interval during which the shutter blades are maintained in their open position after they have been opened by the rotation of the shutter drive member, said charging member being provided with a notch, hook means, and means for urging said hook means into said notch;

• said shutter drive member being adapted to urge said hook means out of said notch as the shutter drive member reaches the position where it is closing the shutter as an exposure period is terminated, whereupon rotation of the charging member in response to the next film winding operation causes said hook means to re-enter said notch.

An electrical shutter for a camera including shutter blades movable between opened and closed positions, said electrical shutter comprising;

• a rotatable shutter drive member for moving said shutter blades between said opened and closed positions by rotating said shutter drive member from a start position substantially through one revolution;
• a prime mover spring for rotatably driving said rotatable shutter drive member;
• charging means for charging said prime mover spring in response to a film winding operation;
• a first detent member for maintaining said shutter drive member at said start position, thereby permitting said prime mover spring to be charged by said charging means prior to operation of said shutter;
• a second detent member selectively movable between positions engageable with and disengageable with said rotatable shutter drive member, said second detent member being located at a position in the rotation path of said rotatable shutter drive member substantially corresponding to said opened position of said shutter blades in said opened position for a predetermined period of time substantially corresponding to the length of an exposure period;
• and
• engagement control means resiliently engageable with said rotatable shutter drive member prior to engagement of said second detent member by said rotatable shutter drive member, whereby said engagement control means attenuates vibrations of said shutter blades which would otherwise be caused by direct impact of said shutter drive member with said second detent member in the absence of engagement control means.

An electrical shutter for a camera including shutter blades movable between opened and closed positions, said electrical shutter comprising;

• a rotatable shutter drive member for moving said shutter blades between said opened and closed positions, by rotating said shutter drive member from a start position substantially through one revolution, said rotatable shutter drive member including a shutter drive member arm extending therefrom;
• a prime mover spring for rotatably driving said rotatable shutter drive member;
• a rotatable charging member for charging said prime mover spring by rotating said charging member in response to a film winding operation, said charging member including a notch on the periphery thereof;
• hook means selectively movable between positions engageable and disengageable with said notch, so that said hook means prevents rotation of said charging member when engaged with said notch, said hook means further including a release arm extending into the path of rotation of said shutter drive member arm when said hook means is engaged with said notch, so that said shutter drive member arm disengages said hook means from said notch when said shutter drive member arm contacts said release arm and urges said release arm out of its path of rotation;
• and
• a detent member for maintaining said shutter drive member at said start position, thereby permitting said prime mover spring to be charged by said rotatable charging member for operation of said shutter.