Mirror retention structure and camera equipped therewith

Abstract

Objects of the present invention are to reduce rebounding of a sub-mirror and to prevent shifting of the mirror-down position. The present invention provides a mirror retention structure comprising, a main mirror retention frame that retains a main mirror, a sub-mirror retention frame that retains a sub-mirror and is axially supported at the main mirror retention frame, and a receiving pin that abuts against the sub-mirror retention frame and sets an angle of the sub-mirror at a mirror-down position, wherein the sub-mirror retention frame is provided with, a first abutting portion that touches against the receiving pin at the mirror-down position; and a second abutting portion, at a different position from the first abutting portion, that touches against the receiving pin at a position prior to the mirror-down position in a transition from a mirror-up position to the mirror-down position.

1 . A mirror retention structure comprising:
 a main mirror retention frame that retains a main mirror;   a sub-mirror retention frame that retains a sub-mirror and is axially supported at the main mirror retention frame; and   a receiving pin that abuts against the sub-mirror retention frame and sets an angle of the sub-mirror at a mirror-down position, wherein   the sub-mirror retention frame is provided with: a first abutting portion that touches against the receiving pin at the mirror-down position; and a second abutting portion, at a different position from the first abutting portion, that touches against the receiving pin at a position prior to the mirror-down position in a transition from a mirror-up position to the mirror-down position.   
   
   
       2 . The mirror retention structure according to  claim 1 , wherein
 the first abutting portion is formed at a surface parallel with the sub-mirror, and the second abutting portion is formed at a surface that is inclined to face an axis of rotation of the sub-mirror with respect to the main mirror retention frame.   
   
   
       3 . The mirror retention structure according to  claim 1 , wherein
 a portion of the receiving pin that abuts against the first abutting portion is different from a portion of the receiving pin that abuts against the second abutting portion.   
   
   
       4 . The mirror retention structure according to  claim 1 , wherein,
 at the mirror-down position, the first abutting portion is disposed at a photography lens side relative to a position at which the sub-mirror is retained.   
   
   
       5 . The mirror retention structure according  claim 1 , wherein
 the receiving pin is an eccentric pin.   
   
   
       6 . A camera comprising the mirror retention structure according to  claim 1 .