Patent ID: 8218066
Filing Date: 2012-07-10
Classification: G03B

Abstract:
1. An interchangeable lens which is the following second interchangeable lens whose flange back is the same as that of a first interchangeable lens, the second interchangeable lens comprising: a protruding portion protruding from a mount reference surface toward an image plane, a protruding amount of the protruding portion being larger than that of the first interchangeable lens, wherein the first interchangeable lens is mountable on first and second cameras, the first camera includes a first wall portion inside its mount and preventing mounting of the second interchangeable lens by the protruding portion of the second interchangeable lens contacting the first wall portion, wherein the second interchangeable lens is mountable on the second camera, the second camera including inside its mount a second wall portion which is provided at a position retreated from the protruding portion of the second interchangeable lens and which is formed as an object side surface of a partitioning portion partitioning an opening through which a luminous flux directed toward a finder optical system passes from a space inside the mount for receiving the protruding portion of the second interchangeable lens, and the second camera further including a mirror member which rotates in an area closer to an object than an image-pickup surface between a first position reflecting the luminous flux from the object toward the finder optical system and a second position retracted from the luminous flux, wherein the mirror member contacts an absorb portion provided on the partitioning portion in the second position, the absorb portion being projected from a bottom of the partitioning portion surface, and wherein a rotation center of the mirror member is located on an opposite side of the finder optical system with respect to a plane including an in-plane direction of a mirror surface of the mirror member such that a most object side vertex of a rotation track of an object side end of the mirror member is located within an area between an image-pickup surface side surface of the partitioning portion and the second wall of the partitioning portion.