# US 8,770,868 B1 · Camera accessory

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- Number: US 8,770,868 B1
- Document ID: US8770868B1
- Status: Granted
- Kind: B1
- Application number: 14/204,473
- Filed: 2014-03-11
- Published: 2014-07-10
- Granted: 2014-07-08
- Earliest claimed: 2011-09-12
- Assignees: Nikon Corporation
- Applicants: Nikon Corporation
- Inventors: Masanori Hasuda; Hideaki Hoshikawa; Noriyasu Kotani
- Web page: https://patentgrep.com/patent/US8770868B1

## CPC

- G03B 17/566: {Accessory clips, holders, shoes to attach accessories to camera (if integral part of camera body G03B17/02)}
- G03B 17/14: interchangeably
- G03B 17/565: {Optical accessories, e.g. converters for close-up photography, tele-convertors, wide-angle convertors}
- H04N 23/55: Optical parts specially adapted for electronic image sensors; Mounting thereof
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

An accessory side mount of the camera accessory includes at least a first limiting portion and a second limiting portion that is different from the first limiting portion. When the first through third claws are rotated in a first rotational direction along the circumferential direction in order to install the accessory side mount that has been inserted in the proper installation and detachment rotational phase into the body side mount, the first limiting portion limits a range of rotation in the first rotational direction by abutting an end surface of one of the camera body side claws. When the first through third claws are rotated in a second rotational direction along the circumferential direction that is opposite to the first rotational direction in order to detach the accessory side mount from the body side mount, the second limiting portion limits a range of rotation in the second rotational direction by abutting an end surface of one of the camera body side claws.

## Claims

### Claim 1

A camera accessory that is detachably fitted to a camera body including a camera body side mount, and that comprises an accessory side mount having a bayonet construction with first through third claws that are mutually separated around a circumferential direction along a circumference a circle with a predetermined diameter and that project in a radial direction from the circumference; wherein:
when the accessory side mount has been inserted into the camera body side mount in a proper installation and detachment rotational phase, each of the first through third claws is permitted to be inserted into the camera body side mount without being hampered by three camera body side claws that are provided to the camera body side mount;
the accessory side mount comprises at least a first limiting portion and a second limiting portion that is different from the first limiting portion;
when the first through third claws are rotated in a first rotational direction along the circumferential direction in order to install the accessory side mount that has been inserted in the proper installation and detachment rotational phase into the body side mount, the first limiting portion limits a range of rotation in the first rotational direction by abutting an end surface of one of the camera body side claws; and
when the first through third claws are rotated in a second rotational direction along the circumferential direction that is opposite to the first rotational direction in order to detach the accessory side mount from the body side mount, the second limiting portion limits a range of rotation in the second rotational direction by abutting an end surface of one of the camera body side claws.

### Claim 2 (depends on 1)

A camera accessory according to claim 1, wherein:
the first limiting portion and the second limiting portion are provided in front of one of the first through third claws.

### Claim 3 (depends on 1)

A camera accessory according to claim 1, wherein:
the first limiting portion is provided in front of one of the first through third claws; and
the second limiting portion is provided in front of any one of two claws, among the first through third claws, other than the one where the first limiting portion is provided.