US 12,276,900 B2
Accessory, image pickup apparatus on which same is mountable, and camera system
Kunihiko Sasaki, Tochigi (JP); Masahisa Tamura, Tochigi (JP); Toshinori Yamazaki, Tokyo (JP); and Masayasu Shigematsu, Tokyo (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Apr. 17, 2024, as Appl. No. 18/638,419.
Application 18/638,419 is a continuation of application No. 18/062,872, filed on Dec. 7, 2022, granted, now 11,994,788.
Application 18/062,872 is a continuation of application No. 17/182,755, filed on Feb. 23, 2021, granted, now 11,537,028, issued on Dec. 27, 2022.
Application 17/182,755 is a continuation of application No. PCT/JP2018/032150, filed on Aug. 30, 2018.
Prior Publication US 2024/0272525 A1, Aug. 15, 2024
Int. Cl. G03B 17/14 (2021.01); G02B 7/02 (2021.01); G03B 17/56 (2021.01)
CPC G03B 17/14 (2013.01) [G02B 7/022 (2013.01); G03B 17/565 (2013.01)] 53 Claims
OG exemplary drawing
 
1. A lens mount configured to be detachably mountable to a camera mount that includes a restricting portion and a plurality of first bayonet claw portions, the lens mount comprising:
a plurality of second bayonet claw portions configured to enable engagement with the plurality of first bayonet claw portions; and
a restricted portion configured to be restricted by the restricting portion when the lens mount is mounted to the camera mount,
wherein the plurality of second bayonet claw portions includes first and second claw portions adjacent to the restricted portion in a circumferential direction,
wherein, when viewed in a central axis direction of the lens mount, a first reference line is a line passing through a center of the restricted portion and a central axis of the lens mount, a boundary line is a line passing through the central axis and orthogonal to the first reference line, a first line is a line passing through the central axis and an end of the first claw portion that is closer to the restricted portion, a second line is a line passing through the central axis and an end of the second claw portion that is closer to the restricted portion, a third line is a line passing through the central axis and an end of the first claw portion that is opposite to the end of the first claw portion that is closer to the restricted portion, and a fourth line is a line passing through the central axis and an end of the second claw portion that is opposite to the end of the second claw portion that is closer to the restricted portion,
wherein an angle formed between the first line and the boundary line is larger than an angle formed between the boundary line and the third line, and an angle formed between the second line and the boundary line is larger than an angle formed between the boundary line and the fourth line, and
wherein the following inequality is satisfied:

OG Complex Work Unit Math
where θ1 is an angle formed between the first reference line and the first line, and θ2 is an angle formed between the first reference line and the second line.