Patent
1978-01-23
1982-10-12
Griffin, Donald A.
354 38, G03B 714
Patent
active
043536301
ABSTRACT:
A camera having an exposure control device in which various photographing informations are converted into digital amounts and supplied to a digital operation circuit and the exposure is controlled by the output of the operation circuit. The camera comprises a digital-analogue converter for converting diaphragm informations from the operation circuit into analogue diaphragm informations, a comparison means for comparing the analogue diaphragm informations from a photographing lens with the analogue informations from the above digital-analogue converter, and an alternating switch which supplies the informations from the photographing lens to the comparison means for shutter preference photographing, and supplies the analogue informations from the photographing lens to the analogue-digital converter for diaphragm preference photographing. The output of the analogue-digital converter is supplied to the operation circuit, and the shutter preference and diaphragm preference photographings is made possible by the changeover of the alternating switch.
REFERENCES:
patent: 3829867 (1974-08-01), Ono
patent: 3886568 (1975-05-01), Yazaki et al.
patent: 4045807 (1977-08-01), Ito et al.
Isobe Yasuo
Ito Fumio
Ito Tadashi
Nakamoto Soichi
Canon Kabushiki Kaisha
Griffin Donald A.
Schreyer Stafford D.
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