Exposure control device for a single lens reflex camera

Details Exposure control device for a single lens reflex camera Exposure control device for a single lens reflex camera

1977-04-15

1978-11-14

Gellner, Michael L.

354 38, G03B 708

Patent

active

041258487

ABSTRACT:
An exposure control 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 is also included which is arranged to furnish a plurality of aperture sizes and is mounted into a lens and which further includes circuitry for receiving light from a photographing object through the diaphragm and converting it into electrical signal. A diaphragm determining device is connected with the diaphragm to select an aperture size, and which is connected to the receiving circuitry and further includes circuitry for detecting the adjustable aperture limit connected with the delay circuit to compensate the adjusted exposure time for proper exposure. A manually operated selector is included for adjusting the diaphragm determining device to insert the adjusted time. A storage capacitor is also included for memorizing the electrical signal of the receiving circuitry connected with the delay circuit when shutter operation is effected.

REFERENCES:
patent: 3324779 (1967-06-01), Nolwsawa et al.
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), Nolwsawa
patent: 3829867 (1974-08-01), Ono
patent: 3909833 (1975-09-01), Sorimachi et al.
patent: 4052727 (1977-10-01), Ito et al.

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