COLLAPSIBLE MOUNT TYPE LENS BARREL

摘要

A cam pin (16) and a slip-off preventive pin (35) which are of the same shape and disposed in a drive frame (15) are engaged with a cam groove (18) and a slip-off preventive groove (36), respectively, which are provided in a cam frame (17). A first projection (37) is installed on at least one side, as seen in the direction of the optical axis, of a portion of the slip-off preventive groove (36) which is engaged by the slip-off preventive pin (35) when the drive frame (15) is paid out. Application of an external force to the drive frame (15) results in contact between the cylindrical portion (35f) of the slip-off preventive pin (35) and the first projection (37). Therefore, the cam pin (16) is prevented from slipping off the cam groove (18). Sharing parts between the cam pin (16) and the slip-off preventive pin (35) makes it possible to reduce the number of parts.