Camera lens barrel having retractable movable contacts

摘要

A lens barrel for a camera body, having a first mount electrically connected to a first branch circuit and a first electrical contact connected to a second branch circuit, has a movable second contact which is retractable into a surface of a second mount on the lens barrel. A switching member is electrically connected to the movable second contact and is adapted to extend and retract the latter so that the movable second contact is electrically connected to the first contact of the camera body when extended, and is spaced apart therefrom when retracted. The switching member has a lower end portion having a third contact thereon, which electrically connects the switching member, the movable second contact and the second branch circuit with the first branch circuit when the movable second contact is extended.