ELECTRICAL CONTACT SYSTEM FOR TRANSMITTING DATA BETWEEN A CAMERA BODY AND AN INTERCHANGEABLE LENS

摘要

A data transmitting electrical contact switching device for a camera adapted for operation in both a shutter speed priority automatic exposure mode and an aperture priority automatic exposure mode. First and second switching electrical contacts are provided on a lens mount and a body mount, respectively, at positions opposite one another. The first switching electrical contact is urged elastically to protrude from a surface of a lens mount while the second switching electrical contact is recessed from the surface of the body mount. A switching plate supports the first switching electrical contact with a pin located at an end portion of the switching plate. The pin is positioned in an elongated groove formed in an aperture preset ring so as to prevent protrusion of the first switching electrical contact in other than the automatic aperture control mode. In the automatic aperture control mode, the pin drops into a notch which extends from the elongated groove to permit the first switching electrical contact to come into contact with the second switching electrical contact.