Patent
1981-10-23
1984-02-07
Gellner, Michael L.
G03B 310
Patent
active
044299656
ABSTRACT:
An exchangeable lens photographic camera of automatic focussing type capable of focussing objects between a minimum and an infinite focussing distance. The camera has an exchangeable lens exchangeable in the camera body. The lens has a first switch providing a signal associated with focussing an object at the infinite distance, and a second switch providing a signal associated with focussing an object at the minimum distance. A focussing motor is coupled to the lens for moving the lens for focussing objects lying between the minimum and infinite distances. A first pair of contacts coupled between the exchangeable lens and the camera body transmits therebetween signals indicating the presence and direction of rotation of the focussing motor. A second pair of contacts, coupled between the exchangeable lens and the camera body, transmits the signals produced by the first and second switches from the exchangeable lens to the camera body. The first and second pairs of contacts are oriented on the exchangeable lens relative to each other for providing signal coupling between the exchangeable lens and the camera body.
REFERENCES:
patent: 4118713 (1978-10-01), Murakami et al.
patent: 4174892 (1979-11-01), Osawa
patent: 4239357 (1980-12-01), Iida
patent: 4303321 (1981-12-01), Enomoto et al.
Enomoto Shigeo
Shimoda Mitsuhiko
Asahi Kogaku Kogyo Kabushiki Kaisha
Gellner Michael L.
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