Manual setting device in digital type electrical control camera

Details Manual setting device in digital type electrical control camera Manual setting device in digital type electrical control camera

1979-01-05

1981-01-13

Hix, L. T.

354289, G03B 7093, G03B 1720

Patent

active

042446430

ABSTRACT:
A manual setting device is provided in a camera wherein the shutter speed is electrically controlled. The manual setting device can be used as an alternate control in an automatic exposure control camera or may be used in a non-automatic electrically controlled camera. For a camera having an electrically controlled shutter speed, first and second counters are provided. The first counter is preset to a computed or desired shutter speed, and the output of the first counter corresponding to the shutter speed is displayed by LEDs in the viewfinder of the camera. The second counter operates in response to an oscillator, and when the count accumulated in the second counter equals that of the first counter, the shutter bottom curtain electromagnet is operated. The manual setting device is a pulse generator controlled by a switch to preset the counter.

REFERENCES:
patent: 4021828 (1977-05-01), Iura et al.
patent: 4079386 (1978-03-01), Murakami et al.
patent: 4079387 (1978-03-01), Kawamura
patent: 4081813 (1978-03-01), Kawamura
The TTL Data Book, 2nd Edition, Texas Instruments, Inc., 1976, pp. 7-143.

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