| 摘要 |
PURPOSE:To make positioning of an interchangeable lens and the electrical connection of the interchangeable lens with a camera body satisfactory, by providing a moving contact energized to the inside in the radial direction, and also forming a cam surface for moving said moving contact. CONSTITUTION:The end part of a contact holding member 25 projecting to the end part of an interchangeable lens body 11 consists of a large diameter part 25a, a small diameter part 25b and a cam part 25c. To the contact holding member 25, plural contact pieces 26 made of an electric conductor are fixed, and they are connected to an electric circuit. The number of contacts 33 in a contact holding member 32 of the inside of a camera body 30 is same as the number of the contact pieces 26, and they are energized to the inside in the radial direction by a coil spring 34. When the interchangeable lens is inserted into the body and is turned clockwise by an angle (theta), the moving contact 33 of the body side is displaced to the outside in the radial direction against the spring 34 by the cam part 25c, but since it contacts with the opposed contact piece 26 by constant contact pressure, the circuit is connected exactly even if array of the contact and positioning accuracy of the interchangeable lens are not so good. |
