Patent
1975-04-16
1977-12-27
Hix, L. T.
354 27, 354 30, 354 34, G03B 710, G03B 716
Patent
active
040657760
ABSTRACT:
The invention discloses a camera with an automatic flash exposure system of the type in which depending upon the distance to a subject, the brightness thereof and the light flux to be produced by a flash tube or bulb, an f-number and exposure time are automatically and electrically selected by an exposure control mechanism comprising a plurality of shutter blades which also function as the aperture blades and a stepping motor for opening and closing stepwise the shutter blades. The focusing ring of the camera is operatively coupled to a variable resistor so that the distance to a subject may be converted into a resistance value, and the opening pulse signal consisting of one or a plurality of pulses the number of which is dependent upon this resistance value and hence the distance to the subject is applied to the step motor so that the shutter blades steps down the camera lens to a suitable f-number depending upon the distance to the subject. The exposure time is determined by an integrator including a photocell for detecting the brightness of the subject.
REFERENCES:
patent: 3750543 (1973-08-01), Eloranta et al.
patent: 3886568 (1975-05-01), Yazaki et al.
patent: 3900855 (1975-08-01), Stempeck
patent: 3903528 (1975-09-01), Kee
patent: 3945025 (1976-03-01), Stempeck
Ishikawa Katsuji
Iwata Hiroshi
Gellner M. L.
Hix L. T,.
West Electric Co. Ltd.
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