Patent ID: 8573868
Filing Date: 2013-11-05
Classification: G03B

Abstract:
1. A camera accessory that is detachably engaged with a camera body including a camera body mount and a plurality of body-side electric contact points, the camera accessory comprising: a camera accessory mount assuming a bayonet structure with a first tab, a second tab and a third tab set over intervals in a circumferential direction running along a circumference of a circle with a predetermined diameter and projecting from the circumference along a radial direction; and accessory-side electric contact points made up with a plurality of electric contact points that become electrically connected with the body-side electric contact points as the camera accessory is mounted at the camera body, wherein: the camera accessory mount is configured to be inserted through the camera body mount without any of the first through third tabs hindered by three camera body-side tabs disposed at the camera body mount as long as the camera accessory mount is inserted at the camera body mount at a correct interlock phase, and the camera accessory mount is configured such that insertion of the camera accessory mount through the camera body mount is disallowed at any phase other than the correct interlock phase with at least two tabs among the first through third tabs coming into contact with at least two of the camera body-side tabs; each of the first through third tabs includes a force application portion, each of the first through third tabs being configured to receive a force imparted from an elastic member at the force application portion toward a reverse side of the camera body when the camera accessory is mounted at the camera body, the elastic member being formed at the camera body-side tabs; and two force application portions located at positions close to a position where the accessory-side electric contact points are disposed, among a first force application portion of the first tab, a second force application portion of the second tab and a third force application portion of the third tab, are set so as to substantially achieve symmetry relative to the accessory-side electric contact points.