Mirror-driving mechanism for single-lens reflex cameras
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorToshiyuki Kitazawa
Life of this patent
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Abstract
Disclosed is a mirror-driving mechanism for a single-lens reflex camera, comprising a first mirror holding frame pivotally mounted on a mirror box, a second mirror holding frame pivotally mounted on the first mirror holding frame, a second mirror urging spring for urging the second mirror holding frame in a direction away from the first mirror holding frame and for urging the second mirror holding frame in a direction bringing it resilient contact with the back of the first mirror holding frame, and a second mirror defining member in engagement with an actuating pin provided on the second mirror holding frame. The resilient member which forms the second mirror defining member comprises a wire spring or a flat spring.
Claims17
A mirror-driving mechanism adapted for use with a single-lens reflex camera comprising a first mirror holding frame adapted to be pivotably mounted on a mirror box of said single-lens reflex camera, said first mirror holding frame having a back surface and being positioned within a photographing optical path during a camera observation period in order to guide light from an object to a finder optical system during said period, a second mirror holding frame pivotably mounted on said first mirror holding frame in order to guide light having passed through a first mirror to a light receiving element, a second mirror urging spring which urges, during said observation period, said second mirror holding frame in a direction away from said first mirror holding frame, said second mirror urging spring urging said second mirror holding frame into resilient contact with the back surface of the first mirror holding frame when the first mirror holding frame rotatably moves upwardly during photographing, and a second mirror restricting member which engages, during upward and downward movement of said first mirror holding frame, an actuating pin provided on said second mirror holding frame so as to thereby restrict the movement of said second mirror holding frame, said restricting member and said pin comprising at least a part of means for imparting to said second mirror urging spring a snap action to change the urging direction of the second mirror urging spring, said second mirror restricting member comprising a resilient member capable of undergoing resilient deformation when said actuating pin impinges on said resilient member.
A mirror-driving mechanism adapted to be used in a single lens reflex camera, said mirror-driving mechanism comprising:
- (a) a first mirror holding frame movably mounted on a mirror box, said first mirror holding frame being adapted to hold a first mirror;
- (b) a second mirror holding frame pivotably mounted on said first mirror holding frame, said second mirror holding frame being adapted to hold a second mirror, said second mirror being positionable along a first side of said second mirror holding frame;
- (c) means for biasing said second mirror holding frame in a direction in which said second mirror will be separated from said first mirror holding frame during a camera observation period, and in a direction which said second mirror will approach said first mirror holding frame when said first mirror holding frame moves upwardly;
- and
- (d) means for restricting pivoting movement of said second mirror holding frame by engaging an actuating member attached to a second side of said second mirror holding frame during upward and downward movement of said first mirror holding frame, wherein said restricting means comprises a resilient member adapted to undergo resilient deformation when said actuating member impinges upon said resilient member.
A mirror-driving mechanism adapted to be used with a single lens reflex camera, said mirror driving mechanism comprising:
- (a) a first mirror holding frame adapted to hold a first mirror;
- (b) a second mirror holding frame pivotably mounted on said first mirror holding frame, said second mirror holding frame being adapted to hold a second mirror;
- (c) an actuating member attached to and extending outwardly from said second mirror holding frame;
- (d) means for restricting movement of said actuating member as said mirror holding frame moves upwardly and downwardly, said restricting means comprising a resilient member;
- and
- (e) means for biasing said second mirror holding frame in a first direction such that said second mirror approaches said first mirror holding frame and in a second direction in which said second mirror is separated from said first mirror holding frame.
Dependencies are inferred from the claim text.