Patent ID: 9164360
Filing Date: 2015-10-20
Classification: G03B

Abstract:
1. A camera accessory that can be detachably mounted at a camera body that includes a camera body mount, the camera accessory including a cylindrical member having an optical path in its inner circumferential side and being equipped with an accessory mount assuming a bayonet structure with a first tab, a second tab and a third tab disposed at a circumferential surface of the cylindrical member over intervals in a circumferential direction running along the circumferential surface and projecting outward from the circumferential surface along a radial direction, wherein: the first tab, the second tab and the third tab are disposed at the accessory mount so that the first tab, the second tab and the third tab can be inserted through the camera body mount without any of the first tab, the second tab and the third tab being hindered by any of three camera body-side tabs at the camera body mount when the accessory mount is inserted into the camera body mount at a predetermined interlock position; the first tab, the second tab and the third tab extend over varying lengths along the circumferential direction; the first tab extends over a greatest length along the circumferential direction among the first tab, the second tab and the third tab; the third tab extends over a smallest length along the circumferential direction among the first tab, the second tab and the third tab; the accessory mount includes: a restricting member disposed adjacent to the third tab such that the third tab overlaps the restricting member as viewed along a direction parallel to an axial direction of the camera accessory, and a lock pin hole through which a lock pin disposed at the camera body is inserted so as to restrict rotation of the camera accessory relative to the camera body, the lock pin hole being disposed between the first tab and the second tab in the circumferential direction, and being disposed closer to the first tab than to the second tab, wherein: the restricting member is disposed at a position assumed on a side substantially opposite from the lock pin hole across a center of the cylindrical member, and when the first tab, the second tab and the third tab are inserted at the predetermined interlock position and completely mounted at the camera body mount, the restricting member and the lock pin hole are disposed substantially along a horizontal axis parallel to a bottom surface of the camera body.