US Patent No. 10,921,691

CAMERA ACCESSORY AND CAMERA


Patent No. 10,921,691
Issue Date February 16, 2021
Title Camera Accessory And Camera
Inventorship Tetsuya Nishio, Kawasaki (JP)
Azusa Sugawara, Yokohama (JP)
Hiroshi Kikuchi, Zushi (JP)
Yoshihiko Konno, Tachikawa (JP)
Tatsuyuki Tokunaga, Saitama (JP)
Takashi Hasegawa, Tokyo (JP)
Assignee CANON KABUSHIKI KAISHA, Tokyo (JP)

Claim of US Patent No. 10,921,691

1. A camera accessory detachably coupled with a camera, comprising:a second mount to be detachably coupled with a first mount provided in the camera, the second mount being provided with second bayonet claws and being brought, by a relative rotation with the first mount, from a first state in which each of the second bayonet claws is inserted between first bayonet claws provided in the first mount prior to engagement between the second bayonet claws and the first bayonet claws, into a second state in which the second bayonet claws engage with the first bayonet claws to complete coupling of the second and first mounts;
a second holding portion provided in the second mount; and
a plurality of electrical contact surfaces arranged along a rotational direction of the second mount,
wherein the first mount is provided with a first holding portion and a plurality of contact pins arranged along the rotational direction of the second mount and held by the first holding portion so as to be protruding from the first holding portion, and the electrical contact surfaces contact with the contact pins in the second state to electrically connect the camera accessory with the camera,
wherein the contact pins include: a first contact pin that can contact with the one of the electrical contact surfaces in the first state; and second contact pin and third contact pin that do not contact with any of the electrical contact surfaces in the first state, and the electrical contact surfaces include: a first electrical contact surface that contacts with the first contact pin in the second state; and a second electrical contact surface and third electrical contact surface that do not contact with the first contact pin in the second state,
wherein the first electrical contact surface is connected to an element that indicates a predetermined voltage and is used for indicating a type of the camera accessory,
wherein the second electrical contact surfaces to be used indicating a ground level,
wherein the third electrical contact surface is used for a communication clock signal,
wherein the first contact pin is used for detecting type of the camera accessory which coupled with the camera based on a voltage level of the first connect pin when the first contact pin contacts with the first electrical contact surface, and
wherein, along the rotational direction of the second mount, a gap width between the first electrical contact surface and the second electrical contact surface adjacent to each other is larger than a gap width between the second electrical contact surface and the third electrical contact surface adjacent to each other, so as to detect a type of the camera accessory before communication with the camera and the camera accessory is started.