STRUCTURE OF ELECTRIC CONTACT FOR INFORMATION TRANSFER OF PHOTOGRAPHIC LENS

PURPOSE:To execute exactly electric conduction even if an insulator adheres, etc. to the surface of a contact, by constituting an electric contact of double contacts to which an elastic force is energized, respectively. CONSTITUTION:Two surfaces of a contact piece 56 which is always projected, of a lens mount 16 of a body side of a camera, and double contacts 36, 52 of a joint pipe 40 for a photographic lens of an exchange type are welded under pressure by an elastic energizing force of the contacts 36, 52 themselves, and the camera body and the lens side conduct electrically by a wide joint area. Also, by a sliding motion of the contacts 36, 52 in case of installing the lens, an object adhering to the surface of the contact is also removed. According to this double contact constitution, even if an insulator adheres to the surface of the contact, or a surface film is formed, an electric conduction can be executed exactly.