Photographic camera

Details Photographic camera Photographic camera

1974-10-24

1976-05-18

Hix, L. T.

354 23D, 354 38, 354 43, 354 51, 354 60A, 354 60L, G03B 708

Patent

active

039582566

ABSTRACT:
A single light-sensitive element serves to furnish a signal for setting the aperture prior to the exposure time and to control the exposure time. Prior to the exposure time a first and second threshold stage furnish a first and second threshold output signal respectively when the light is in a first and second predetermined range. The first and second threshold output signals are applied to the control input of a first and second D flip-flop. The output of the D flip-flop varies as a function of the signal at the control input only in the presence of a gating signal. The gating signals are applied to the D flip-flops only prior to the exposure time. The outputs of the first and second D flip-flops are applied to an exclusive OR-circuit whose output is applied to aperture control means which vary the size of the aperture in dependence on the logic circuit output signal. The D flip-flop maintains its output after removal of the gating signal thereby maintaining the aperture size during exposure. A switch operative with the diaphragm aperture control switches integrating circuit elements corresponding to the aperture size into the automatic exposure control circuit of the camera during exposure.

REFERENCES:
patent: 3455219 (1969-07-01), Burgarella
patent: 3782254 (1974-01-01), Matsuzaki et al.
patent: 3792648 (1974-02-01), Ishiguro
patent: 3798663 (1974-03-01), Wagensonner et al.
patent: 3833913 (1974-09-01), Wick et al.
Pin-Out Diagram for 7477 Quad Bistable Latch, from TTL Pinout Handbook, IMS Associates, Inc.

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