Drive mechanism for movable mirror of camera

A movable-mirror drive mechanism of a camera, comprising:

• a main mirror which is supported by a main-mirror holding frame and is driven to rotate between a viewfinder light-guiding position, in which said main mirror is positioned in a photographing optical path to reflect incident light, emanating 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-emanating light to travel toward a photographic light-receiving medium;
• a sub-mirror which is supported by a sub-mirror holding frame that is supported by said main-mirror holding frame to be rotatable relative to said main-mirror holding frame, wherein said sub-mirror holding frame is positioned in a projecting position and said sub-mirror reflects part of said incident light emanated from said object in a direction different from a direction toward said viewfinder optical system when said main mirror is in said viewfinder light-guiding position, and wherein said sub-mirror holding frame is positioned in a sub-mirror retracted position and said sub-mirror is retracted with said main mirror from said photographing optical path when said main mirror is in said retracted position;
• and
• a vibration control member which operates in direct response to rotation of said main-mirror holding frame, suppresses bouncing of said sub-mirror holding frame when said sub-mirror is positioned in at least one of said projecting position and said sub-mirror retracted position, and provides said sub-mirror holding frame with a pressing force in a direction corresponding to a rotation direction of said main-mirror holding frame when said vibration control member receives a reaction force from said sub-mirror holding frame in a state where said main mirror is at a midpoint between said retracted position and said viewfinder light-guiding position,
• wherein said main mirror holding frame includes a gear and said vibration control member includes a gear, said gears being engaged with each other so that a rotational force of said main mirror holding frame is transmitted to said vibration control member by said gears.

A movable-mirror drive mechanism of a camera comprising

• a main mirror which is supported by a main-mirror holding frame and is driven to rotate between a viewfinder light-guiding position, in which said main mirror is positioned in a photographing optical path to reflect incident light, emanating 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-emanating light to travel toward a photographic light-receiving medium;
• a sub-mirror which is supported by a sub-mirror holding frame that is supported by said main-mirror holding frame to be rotatable relative to said main-mirror holding frame, wherein said sub-mirror holding frame is positioned in a projecting position and said sub-mirror reflects part of said incident light emanating from said object in a direction different from a direction toward said viewfinder optical system when said main mirror is in said viewfinder light-guiding position, and wherein said sub-mirror holding frame is positioned in a sub-mirror retracted position and said sub-mirror is retracted with said main mirror from said photographing optical path when said main mirror is in said retracted position;
• and
• a vibration control member which rotates in direct response to rotation of said main-mirror holding frame, and holds said sub-mirror holding frame in said projecting position to prevent said sub-mirror holding frame from rotating toward said sub-mirror retracted position at least when said main mirror rotates to said viewfinder light-guiding position,
• the rotation of said main mirror holding frame being transmitted to said vibration control member without being transmitted through said sub-mirror holding frame.