Patent
1985-01-18
1986-08-05
Perkey, William B.
G03B 1700
Patent
active
046039554
ABSTRACT:
A camera has a camera body with an electrically conductive camera mount and an interchangeable lens with a lens mount. The lens mount is secured to the camera body by rotation of the lens mount relative to the camera body with flat surfaces of the lens mount and the camera mount in abutting relationship. A first electrical contact in the lens mount is movable normal to the flat surface thereof. A spring urges the first contact out of the flat surface of the lens mount. A stationary second electrical contact in the camera mount opens toward the flat surface thereof without protrusion in alignment with the first contact when the lens mount is secured to the camera mount so the first contact normally bears against the second contact. The second contact is insulated from the camera body. The second contact is alternately connected and disconnected electrically to and from the camera mount through the first contact. A plurality of third contacts in the camera mount are movable normal to the flat surface thereof. Springs individually urge the third contacts out of the flat surface of the camera mount. One or more stationary insulative regions in the lens mount open toward the flat surface thereof without protrusion in alignment with one or more of the respective third contacts so the one or more of the respective third contacts bear against the respective one or more insulative regions when the lens mount engages the camera mount. Responsive to rotation of the lens mount as the lens mount is secured to the camera mount, foreign matter is wiped from the second contact, preferably by an insulative surface on the lens mount that bears against the second contact ahead of the first contact in the path of rotation of the lens mount.
REFERENCES:
patent: 4357089 (1982-11-01), Okura et al.
patent: 4457608 (1984-07-01), Komoto et al.
Asahi Kogaku Kogyo Kabushiki Kaisha
Perkey William B.
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