Accessory, image pickup apparatus on which same is mountable, and camera system

Patent metadata

Field	Value
Publication number	US-10620510-B2
Application number	US-201815992785-A
Country	US
Kind code	B2
Filing date	May 30, 2018
Priority date	May 31, 2017
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

An accessory configured to be detachably mountable to an image pickup apparatus including a first mount portion including first bayonet claw portions, and first terminals, the accessory including a second mount portion including second bayonet claw portions configured to enable engagement with the first bayonet claw portions, and second terminals configured to enable contact with the first terminals, in which the second terminals are provided at positions that are different from positions of the second bayonet claw portions, and wherein, a half line that extends from a central axis of the second mount portion and passes through a second terminal that determines whether an optical apparatus is mounted on the image pickup apparatus or not, passes through a predetermined second bayonet claw portion.

First claim

What is claimed is:

1. An accessory configured to be detachably mountable to an image pickup apparatus having a plurality of first terminals and a first mount portion that includes a plurality of first bayonet claw portions, the accessory comprising:
a second mount portion including a plurality of second bayonet claw portions configured to enable engagement with the plurality of first bayonet claw portions; and
a plurality of second terminals configured to contact with the plurality of first terminals when the accessory is mounted to the image pickup apparatus, wherein a determination terminal, among the plurality of second terminals, is configured to determine whether the accessory is mounted on the image pickup apparatus or not,
wherein the plurality of second terminals are provided at positions that are different from positions of the plurality of second bayonet claw portions, and
wherein, when viewed in a central axis direction of the second mount portion, a half line, that extends from a central axis of the second mount portion and passes through the determination terminal, passes through a predetermined bayonet claw portion among the plurality of second bayonet claw portions.

2. The accessory according to claim 1 ,
wherein, among the plurality of second terminals, a plurality of terminals are configured to be used in communication between the image pickup apparatus and the accessory, and
wherein, when viewed in the central axis direction, a plurality of half lines, that extends from the central axis and passes through the plurality of terminals, all pass through the predetermined bayonet claw portion.

3. The accessory according to claim 1 , further comprising a terminal holding portion configured to hold the plurality of second terminals,
wherein either one of the terminal holding portion and the second mount portion includes a protrusion, and the other one of the terminal holding portion and the second mount portion includes a hole portion or a recess to which the protrusion engages.

4. The accessory according to claim 3 ,
wherein, when a reference terminal is the terminal configured to determine whether the accessory is mounted on the image pickup apparatus or not, a first adjacent terminal is a terminal adjacent to the reference terminal on one side with respect to the reference terminal, a second adjacent terminal is a terminal adjacent to the reference terminal on the other side with respect to the reference terminal, and a third adjacent terminal is a terminal adjacent to the second adjacent terminal, and
wherein, when viewed in the central axis direction, the protrusion and the hole portion or the recess are inside a region between a half line that extends from the central axis and passes through the first adjacent terminal, and a half line that extends from the central axis and passes through the third adjacent terminal.

5. The accessory according to claim 4 , wherein, when viewed in the central axis direction, the protrusion and the hole portion or the recess are inside a region between a half line that extends from the central axis and passes through the reference terminal, and the half line that extends from the central axis and passes through the third adjacent terminal.

6. The accessory according to claim 3 , wherein, when viewed in the central axis direction, a half line, that extends from the central axis and passes through the protrusion, passes through the predetermined bayonet claw portion.

7. The accessory according to claim 1 , wherein the plurality of second terminals includes a distinguish terminal configured to distinguish a type of the accessory mounted on the image pickup apparatus.

8. The accessory according to claim 7 , wherein, when viewed in the central axis direction, a half line, that extends from the central axis and passes through the distinguish terminal, passes through between the plurality of second bayonet claw portions.

9. The accessory according to claim 8 , wherein the plurality of second terminals includes a terminal configured to connect the image pickup apparatus and a communication control system of the accessory to ground, and a terminal configured to supply power, used in operation of the communication control system, from the image pickup apparatus to the accessory.

10. The accessory according to claim 9 , wherein the plurality of second terminals includes a terminal configured to connect the image pickup apparatus and a mechanical drive system of the accessory to the ground, and a terminal configured to supply power, used in operation of the mechanical drive system, from the image pickup apparatus to the accessory.

11. The accessory according to claim 10 ,
wherein the plurality of second terminals includes a first communication unit configured to perform a first communication, and
wherein the first communication unit includes a terminal configured to communicate a clock signal that is output from the image pickup apparatus to the accessory, a terminal configured to facilitate two-way communication between the image pickup apparatus and the accessory, and a terminal configured to communicate data that is output from the accessory to the image pickup apparatus.

12. The accessory according to claim 11 ,
wherein the plurality of second terminals includes a second communication unit configured to perform a second communication independent of the first communication, and
wherein the second communication unit includes a terminal configured to communicate data that is output from the accessory to the image pickup apparatus.

13. The accessory according to claim 12 ,
wherein the plurality of second terminals includes a third communication unit configured to perform a third communication independent of the first communication and the second communication, and
wherein the third communication unit includes a terminal configured to facilitate two-way communication between the image pickup apparatus and the accessory, and a terminal configured to communicate a communication request signal between the image pickup apparatus and the accessory.

14. The accessory according to claim 1 , further comprising a lens.

15. The accessory according to claim 1 , wherein the accessory is configured to be detachably mountable to a lens apparatus.

16. The accessory according to claim 15 , further comprising a third mount portion including a plurality of third bayonet claw portions configured to enable engagement with the lens apparatus,
wherein a smallest angle of the plurality of third bayonet claw portions in a circumferential direction is larger than a smallest angle of a cutaway between the plurality of second bayonet claw portions in a circumferential direction.

17. The accessory according to claim 15 ,
wherein the second mount portion has a concave portion in which a pin provided to the image pickup apparatus is inserted when the accessory is mounted to the image pickup apparatus,
wherein a reference line passes through a center of the concave portion and the central axis of the second mount portion,
wherein a boundary line is a line that is orthogonal to the reference line and passes through the central axis of the second mount portion,
wherein, when viewed in the central axis direction, a concave portion side is a side on which the concave portion is provided with respect to the boundary line, and
wherein the plurality of second bayonet claw portions includes (i) first and second concave portion side bayonet claw portions each having at least a portion disposed on the concave portion side, and (ii) an opposite side bayonet claw

Assignees

• Canon Kk

Inventors

• Tamura Masahisa
• Sasaki Kunihiko
• Yamazaki Toshinori
• Shigematsu Masayasu

Classifications

• G03B17/56 Primary

  Accessories (carrying-cases A45C11/38) · CPC title

• H01R13/2471

  pin shaped · CPC title

• G03B17/566

  Accessory clips, holders, shoes to attach accessories to camera (if integral part of camera body G03B17/02) · CPC title

• G02B27/648

  for automatically maintaining a reference alignment, e.g. in self-levelling surveying instruments (surveying instruments per se G01C) · CPC title

• G03B17/565 Primary

  Optical accessories, e.g. converters for close-up photography, tele-convertors, wide-angle convertors · CPC title