Patent ID: 9075287
Filing Date: 2015-07-07
Classification: G03B

Abstract:
1. A camera accessory that can be detachably engaged with 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, the camera accessory and the camera body being configured to exchange signals between each other via respective electrical contact points when the accessory mount is fully mounted to the camera body mount, wherein: the first through third tabs are disposed at the accessory mount so that the first through third tabs can be inserted through the camera body mount without any of the first through third tabs 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 correct interlock phase; 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 through third tabs; the third tab extends over a smallest length along the circumferential direction among the first through third tabs; the accessory mount includes a restricting member disposed such that the third tab overlaps the restricting member as viewed along a direction parallel to an axial direction of the camera accessory; the restricting member is provided overlapped by the third tab so as to come into contact with a side end of one camera body-side tab among the camera body-side tabs when the first through third tabs having been inserted into the camera body mount at the correct interlock phase are rotated along the circumference in a first rotating direction, thereby restricting a rotation range in the first rotating direction; and the restricting member is provided overlapped by the third tab so as to come into contact with a side end of a camera body-side tab different from the one camera body-side tab when the first through third tabs are rotated with respect to the camera body mount along the circumference in a second rotating direction opposite from the first rotating direction, thereby restricting a rotation range in the second rotating direction.