Control system for single lens reflex camera

Details Control system for single lens reflex camera Control system for single lens reflex camera

1978-09-07

1981-04-28

Hix, L. T.

354 31, 354 38, 354152, 354228, G03B 7087, G03B 900, G03B 1912

Patent

active

042641594

ABSTRACT:
An automatic exposure control system for a single lens reflex camera, of the type wherein diaphragm blades defining a diaphragm aperture are driven in response to a camera release operation to change the aperture in accordance with the light from an object to be photographed (object light) as measured by a light measuring device which has a photoelectric element adapted to receive the object light through changing diaphragm aperture as well as through the camera objective. When the output of the light measuring device reaches or goes beyond a given level, a control device generates an output signal to actuate a first electromagnetic device which stops the operation of the diaphragm blades so that a diaphragm aperture suitable for the object brightness is determined as a function of a set shutter speed and a set film sensitivity. The output signal also serves to actuate a second electromagnetic device which actuates a reflex mirror immediately after the diaphragm aperture determination, with a shutter mechanism being actuated subsequently for film exposure. The shutter may be controlled in accordance with the output of the light measuring circuit which measures the scene brightness through the determined diaphragm aperture.

REFERENCES:
patent: 3777637 (1973-12-01), Kuramoto et al.
patent: 3922693 (1975-11-01), Matsui
patent: 3972055 (1976-07-01), Matsuda et al.
patent: 4089014 (1978-05-01), Ueda et al.
patent: 4099192 (1978-07-01), Aizawa et al.
patent: 4142787 (1979-03-01), Ueda et al.
patent: 4162839 (1979-05-01), Mashimo et al.

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