Camera exposure control and indicating circuitry responsive to a

Details Camera exposure control and indicating circuitry responsive to a Camera exposure control and indicating circuitry responsive to a

1977-07-25

1978-05-23

Hix, L. T.

354 53, 354 60A, 354 60F, 354 60L, 354149, G03B 1505, G03B 708

Patent

active

040913961

ABSTRACT:
Camera exposure control circuitry for automatically controlling exposure time or the diaphragm aperture in accordance with scene brightness, is provided with an indicating device for indicating exposure conditions to be determined by the control circuitry. In response to a rectangular wave signal produced by a photoflash device upon completion of charging of the main capacitor thereof, the control circuitry is set to provide a proper exposure condition suitable for flash photography. The indicating device intermittently energizes one of a plurality of indicator elements that indicates the proper exposure condition, in response to upper level portions of the rectangular wave signal. An exposure control magnet is controlled by two parallelly connected transistors, one being responsive to the output of the control circuitry and the other being responsive to the signal from the photoflash device.

REFERENCES:
patent: 4016575 (1977-04-01), Uchiyama et al.
patent: 4043677 (1977-08-01), Toyoda
patent: 4047194 (1977-09-01), Nakamura et al.

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