Camera exposure control device

Details Camera exposure control device Camera exposure control device

1980-04-14

1982-04-20

Hix, L. T.

354 38, G03B 7087

Patent

active

043256171

ABSTRACT:
AE-lock photography with accurate exposure control is made possible by a camera exposure control device which memorizes outputs of a T.T.L. light measuring device at a desired time prior to a camera release operation and at a time immediately before the commencement of stopping-down operation of a diaphragm, respectively. The exposure control device arrests the diaphragm for determination of the diaphragm aperture when the light measuring device, during stopping-down of the diaphragm, represents a given relationship with the sum of, on one hand, the difference between the stored outputs and on the other hand a signal commensurate with a preselected shutter speed, and thereafter determines a shutter speed in accordance with the sum of, on one hand, the difference between the stored outputs and, on the other hand, the output of the light measuring device commensurate with the intensity of scene light measured through the determined diaphragm aperture. Information of a set film sensitivity is counted in the outputs of the light measuring device. A light measuring device which is different in type from the T.T.L. light measuring device may be employed for generation of an output which is stored in place of the output of the T.T.L. light measuring device generated at a desired time prior to a camera release operation.

REFERENCES:
patent: 3829867 (1974-08-01), Ono
patent: 4103307 (1978-07-01), Shinoda et al.
patent: 4174160 (1979-11-01), Nanba et al.

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