Camera body, lens barrel and lens-interchangeable camera

摘要

A camera body includes a plurality of body-side bayonet lugs which are provided on the peripheral edge of an opening; and a protrusion which is positioned in a circular-arc opening formed between adjacent body-side bayonet lugs of the body-side bayonet lugs, the distance between the protrusion and either of adjacent two body-side bayonet lugs of the body-side bayonet lugs being shorter than each of the lens-side bayonet lugs; and a body-side mount surface with which the lens-side bayonet surface comes into contact from the front side when the lens-side bayonet lugs are positioned immediately behind the body-side bayonet lugs.

主权项

1. A camera body comprising:
a substantially circular opening formed in a front side thereof, said substantially circular opening capable of receiving a lens barrel capable of being attached and detached to and from said opening, wherein said lens barrel includes a cylindrical portion extending rearward from said lens barrel, a plurality of lens-side bayonet lugs which are provided at a rear end of said cylindrical portion and project toward an outer peripheral side, a recessed portion which is formed on an outer edge of one of said lens-side bayonet lugs, and a lens-side mount surface, a plurality of body-side bayonet lugs which are provided on a peripheral edge of said opening and project toward an inner peripheral side; a protrusion which is positioned in a circular-arc opening, formed between mutually adjacent body-side bayonet lugs of said body-side bayonet lugs, said protrusion being loosely engaged in said recessed portion when each of said lens-side bayonet lugs is positioned in a corresponding said circular-arc opening, and being positioned at a different circumferential position from said lens-side bayonet lugs which are positioned immediately behind said body-side bayonet lugs, wherein a distance between said protrusion and either of adjacent two body-side bayonet lugs of said body-side bayonet lugs is shorter than the length of each of said lens-side bayonet lugs; and a body-side mount surface with which said lens-side bayonet surface comes into contact from a front side when said lens-side bayonet lugs are positioned immediately behind said body-side bayonet lugs; wherein said body-side bayonet lugs have a circular-arc shape, and wherein said camera body comprises a circular arc protrusion which is positioned inside said camera body and projects forward, said circular arc protrusion being spaced toward said inner peripheral side from one of said circular-arc openings on which said protrusion is not provided and two of said body-side bayonet lugs that are adjacent to said one of circular-arc openings on which said protrusion is not provided, and said circular protrusion being concentric with said body-side bayonet lugs, and wherein a recess-shaped circular-arc space is defined between said circular arc protrusion and said body-side mount surface so that said cylindrical portion is positioned in said recess-shaped circular-arc space, when said lens barrel rotates.