Patent
1984-08-15
1986-02-11
Perkey, William B.
354455, 354286, G03B 720
Patent
active
RE0320803
ABSTRACT:
A photographic camera has a camera body, an interchangeable lens assembly mounted on the camera body, and an automatic exposure control mechanism located in the camera body. The mechanism responds to a first binary signal representative of a maximum lens aperture value in binary code and a second binary signal representative of a minimum lens aperture value in binary code. The first signal has a given number of binary bits. The second signal is generated in the lens assembly. A third signal representative of the arithmetic difference between the first and second signals is also generated in the lens assembly. The third signal has a number of binary bits fewer than the given number. The second and third signals generated in the lens assembly are transmitted to the camera body. In the camera body, the second signal is applied to the mechanism and the transmitted second and third signals are arithmetically added to derive the first signal, which is applied to the mechanism.
REFERENCES:
patent: 3928858 (1975-12-01), Sakurada et al.
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patent: 4118726 (1978-10-01), Kuramoto et al.
patent: 4214824 (1980-07-01), Stemme et al.
patent: 4283133 (1981-08-01), Ishizaka et al.
patent: 4477161 (1984-10-01), Kawasaki et al.
Asahi Kogaku Kogyo Kabushiki Kaisha
Perkey William B.
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