1979-01-08
1980-04-08
Griffin, Donald A.
354 23D, 354 53, 354 60L, G03B 708, G03B 1720, G03B 1700
Patent
active
041969979
ABSTRACT:
In an interchangeable lens for a camera, at least three terminals are provided on the fixing cylinder of the lens. A variable diaphragm resistor exhibiting a resistance value corresponding to the diaphragm value set by the diaphragm drive ring of the lens and a variable range resistor exhibiting a resistance value corresponding to the film-to-subject distance set by the range ring of the lens are series connected between two of the terminals. A resistance value representing the guide number information is generated between the two terminals. The remaining one of the terminals is connected to the junction between the variable diaphragm resistor and the variable range resistor, and a resistance value representing the diaphragm information or the range information is generated between the remaining one terminal and the two terminals.
REFERENCES:
patent: 3846806 (1974-11-01), Yata et al.
patent: 3928858 (1975-12-01), Sakurada et al.
patent: 4063257 (1977-12-01), Mashimo et al.
patent: 4090207 (1978-05-01), Mashimo et al.
patent: 4112440 (1978-09-01), Kanemaru
Hasegawa Hiroshi
Kotaka Yoshiro
Ohmori Sachio
Griffin Donald A.
Nippon Kogaku K.K.
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