1975-05-09
1977-06-28
Adams, Russell E.
354 24, 354 50, 354 60A, G03D 708
Patent
active
040329321
ABSTRACT:
A camera is provided with a photo-responsive pulse generator for generating pulses the number of which is determined by the logarithmically converted light intensity at an object which is to be photographed. A reference pulse generator is also provided for generating a series of reference pulses at intervals from one reference pulse to the next which become progressively greater. A shutter-operating plunger is available to the operator to be depressed for tripping the shutter, and this plunger is operatively connected to the photo-responsive pulse generator for activating the latter just prior to opening of the shutter and to the reference pulse generator for activating the latter simultaneously with opening of the shutter. A pulse-responsive structure is operatively connected with both of the pulse generators for receiving first pulses from the photo-responsive pulse generator and then pulses from the reference pulse generator, this pulse-responsive structure providing an output when a predetermined relationship is provided between the reference pulses received from the reference pulse generator and the pulses received from the photo-responsive pulse generator. A shutter-closing structure responds to the latter output for closing the shutter.
REFERENCES:
patent: 3748979 (1973-07-01), Wada
patent: 3769887 (1973-11-01), Nobusawa
patent: 3827065 (1974-07-01), Wada
patent: 3842587 (1974-10-01), Strauss et al.
patent: 3868704 (1975-02-01), Yamada et al.
patent: 3879118 (1975-04-01), Kiyohara et al.
patent: 3928858 (1975-12-01), Sakurada et al.
Adams Russell E.
Asahi Kogaku Kogyo Kabushiki Kaisha
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