Patent ID: 8979400
Filing Date: 2015-03-17
Classification: G03B

Abstract:
1. A movable-mirror drive mechanism of a camera, comprising: a main-mirror support member which supports a main mirror and is supported to be rotatable about a first axis between a viewfinder light-guiding position, in which said main mirror is positioned in a photographing optical path to reflect incident light emanated from an object toward a viewfinder optical system of said camera, and a retracted position, in which said main mirror is retracted from said photographing optical path to allow said object-emanated light to travel toward a photographic light-receiving medium; a sub-mirror support member which supports a sub-mirror and is supported to be rotatable relative to said main-mirror support member about a second axis which is substantially parallel to said first axis and is positioned in a jutting-out position, in which said sub-mirror juts from said main mirror in said photographing optical path, when said main-mirror support member is in said viewfinder light-guiding position, and which is positioned in a sub-mirror retracted position, in which said sub-mirror is retracted to a back of said main mirror, when said main-mirror support member is in said retracted position; a first shock-absorbing member which is held in a first shock-absorbing stand-by position by a first biaser, said first shock-absorbing member coming into contact with said main-mirror support member and being pressed and moved thereby against a biasing force of said first biaser to absorb shock of said main-mirror support member when said main-mirror support member rotates from said retracted position to said viewfinder light-guiding position; a second shock-absorbing member which is held in a second shock-absorbing stand-by position by a second biaser, said second shock-absorbing member coming into contact with said main-mirror support member and being pressed and moved thereby against a biasing force of said second biaser to absorb shock of said main-mirror support member when said main-mirror support member rotates from said viewfinder light-guiding position to said retracted position; and a third shock-absorbing member which is held in a third shock-absorbing stand-by position by a third biaser, said third shock-absorbing member coming into contact with said sub-mirror support member and being pressed and moved thereby against a biasing force of said third biaser to absorb shock of said sub-mirror support member when said sub-mirror support member rotates from said sub-mirror retracted position to said jutting-out position in association with rotation of said main-mirror support member to said viewfinder light-guiding position, wherein, when said main-mirror support member is in said viewfinder light-guiding position, said first shock-absorbing member is held in a non-contact position with respect to said main-mirror support member by said second shock-absorbing member positioned in said second shock-absorbing stand-by position, and wherein, when said sub-mirror support member is in said jutting-out position, said third shock-absorbing member is held in a non-contact position with respect to said sub-mirror support member by said first shock-absorbing member.