Camera system

Claim 2

A camera system comprising: (a) a camera body including: (a-1) a camera-side mount; (a-2) a groove which is disposed in rear of a mount abutting face of said camera-side mount in the direction of an optical axis and which is formed on an outer circumference of said camera-side mount; and (a-3) a ring-shaped elastic member disposed in said groove; and (b) an optical accessory including: (b-1) an accessory-side mount which is capable of being coupled with said camera-side mount; and (b-2) a tubular protruding part which is disposed in rear of a mount abutting face of said accessory-side mount in the direction of the optical axis, said tubular protruding part having an inner circumferential face which is capable of being brought into pressure contact with said ring-shaped elastic member.

Claim 3

A camera system according to claim 1, wherein said optical accessory is an interchangeable lens.

Claim 4

A camera system according to claim 1, wherein said groove is formed in said camera-side mount.

Claim 5

A camera body comprising: (a) a camera-side mount; (b) a groove which is disposed in rear of a mount abutting face of said camera-side mount in the direction of an optical axis and which is formed on an outer circumference of said camera-side mount; and (c) a ring-shaped elastic member disposed in said groove.

Claim 6

A camera body comprising: (a) a camera-side mount; (b) a groove which is disposed in rear of a mount abutting face of said camera-side mount in the direction of an optical axis and which is formed on an outer circumference of said camera-side mount; and (c) a ring-shaped elastic member disposed in said groove.

Claim 7

An optical accessory mountable on and demountable from a camera body, comprising: (a) a camera-side mount, and a ring-shaped elastic member which is disposed in a groove positioned rearwardly of a mount abutting face of said camera-side mount in the direction of an optical axis, said groove being formed on an outer circumference of said camera-side mount; (b) an accessory-side mount which is mountable on said camera-side mount, said accessory-side mount comprising; (c) a tubular protruding part which is disposed rearwardly of a mount abutting face of said accessory-side mount in the direction of an optical axis and (d) said part having an inner diameter larger than said mount abutting face, an inner diameter of said part being arranged to contact said ring-shaped elastic member when said accessory-side mount is mounted on said camera-side mount.

Claim 8

An optical accessory mountable on and demountable from a camera body, comprising: (a) a camera-side mount, and a ring-shaped elastic member which is disposed in a groove positioned rearwardly of a mount abutting face of said camera-side mount in the direction of an optical axis, said groove being formed on an outer circumference of said camera-side mount; (b) an accessory-side mount which is mountable on said camera-side mount, said accessory-side mount comprising; (c) a tubular protruding part which is disposed rearwardly of a mount abutting face of said accessory-side mount in the direction of an optical axis and (d) said part having an inner diameter larger than said mount abutting face, an inner diameter of said part being arranged to contact said ring-shaped elastic member when said accessory-side mount is mounted on said camera-side mount.

Claim 9

A camera body according to claim 4, wherein said groove is formed in said camera-side mount.

Claim 10

An accessory according to claim 5, wherein said optical accessory is an interchangeable lens.

Claim 11

An optical accessory mountable on and demountable from a camera body, comprising: (a) a camera-side mount, and a ring-shaped elastic member which is disposed in a groove positioned rearwardly of a mount abutting face of said camera-side mount in the direction of an optical axis, said groove being form in an outer circumference of said camera-side mount; (b) an accessory-side mount which is mountable on said camera-side mount, said accessory-side mount comprising; (c) a member which is mountable on and demountable from said optical accessory, said member having a tubular part having an inner diameter larger than a mount abutting face of said accessory-side mount, said tubular part being located rearwardly of said mount abutting face in the direction of an optical axis when said member is mounted on said optical accessory, and an inner diameter surface of said tubular part being arranged to contact said ring-shaped elastic member when said accessory-side mount is mounted on said camera-side mount.

Claim 12

An optical accessory mountable on and demountable from a camera body, comprising: (a) a camera-side mount, and a ring-shaped elastic member which is disposed in a groove positioned rearwardly of a mount abutting face of said camera-side mount in the direction of an optical axis, said groove being form in an outer circumference of said camera-side mount; (b) an accessory-side mount which is mountable on said camera-side mount, said accessory-side mount comprising; (c) a member which is mountable on and demountable from said optical accessory, said member having a tubular part having an inner diameter larger than a mount abutting face of said accessory-side mount, said tubular part being located rearwardly of said mount abutting face in the direction of an optical axis when said member is mounted on said optical accessory, and an inner diameter surface of said tubular part being arranged to contact said ring-shaped elastic member when said accessory-side mount is mounted on said camera-side mount.

Claim 13

An accessory in claim 8, wherein said optical accessory is an interchangeable lens.

Claim 14

An optical accessory mountable on and demountable from a camera body, comprising: (a) an accessory-side mount which is mountable on said camera-body mount; (b) a member which is mountable on and demountable from said optical accessory, said member having a tubular part having an inner diameter larger than a mount abutting face of said accessory-side mount, said tubular part being located in rear of said mount abutting face in the direction of an optical axis when said member is mounted on said optical accessory; (c) an accessory-side groove which is disposed in rear of said mount abutting face of said accessory-side mount in the direction of the optical axis and which is formed on an outer circumference of said accessory-side mount; (d) a ring-shaped elastic member disposed in said groove; and (e) a second tubular part which is arranged at said member to come into pressure contact with said ring-shaped elastic member when said member is mounted.

Claim 15

An optical accessory mountable on and demountable from a camera body, comprising: (a) an accessory-side mount which is mountable on said camera-body mount; (b) a member which is mountable on and demountable from said optical accessory, said member having a tubular part having an inner diameter larger than a mount abutting face of said accessory-side mount, said tubular part being located in rear of said mount abutting face in the direction of an optical axis when said member is mounted on said optical accessory; (c) an accessory-side groove which is disposed in rear of said mount abutting face of said accessory-side mount in the direction of the optical axis and which is formed on an outer circumference of said accessory-side mount; (d) a ring-shaped elastic member disposed in said groove; and (e) a second tubular part which is arranged at said member to come into pressure contact with said ring-shaped elastic member when said member is mounted.

Claim 16

An accessory according to claim 10, wherein said member is arranged to be mounted on said optical accessory in the neighborhood of said accessory-side mount while said member is rotated around the optical axis by means of a threaded mechanism.