Patent
1974-11-25
1977-10-04
Hix, L. T.
354 38, G03B 714
Patent
active
040527271
ABSTRACT:
An exposure control device for a single lens reflex camera includes an adjustable shutter which is arranged to furnish a plurality of exposure times, and an adjustable electrical delay circuit which is operative to adjust the shutter to select the exposure time. An adjustable diaphragm device is also included which is arranged to furnish a plurality of aperture sizes and is mounted into a lens and which further includes means for receiving light from a photographing object through the diaphragm device and converting it into electrical signal. A diaphragm determining means is connected with the diaphragm device to select an aperture size, and which is connected to the receiving means and further includes means for detecting the adjustable aperture limit connected with the delay circuit to compensate the adjusted exposure time for proper exposure. A manually operated selector means is included for adjusting the diaphragm determining means to insert the adjusted time thereinto. Storage means is also included for memorizing the electrical signal of the receiving means connected with the delay means when shutter operation is effected.
REFERENCES:
patent: 3416421 (1968-12-01), Biedermann et al.
patent: 3466447 (1969-09-01), Fahlenberg
patent: 3554104 (1971-01-01), Winkler et al.
patent: 3662659 (1972-05-01), Metzger et al.
patent: 3672753 (1972-06-01), Nobusawa
patent: 3829867 (1974-08-01), Ono
patent: 3909833 (1975-09-01), Sorimachi et al.
Isobe Yasuo
Ito Fumio
Ito Tadashi
Nakamoto Soichi
Canon Kabushiki Kaisha
Hix L. T,.
LaBarre J. A.
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