Device for displaying bulb photographing operation time in a pho

Details Device for displaying bulb photographing operation time in a pho Device for displaying bulb photographing operation time in a pho

1982-05-19

1983-08-09

Adams, Russell E.

354 60L, 354289, G03B 708

Patent

active

043975348

ABSTRACT:
A display device for displaying the time of a bulb photographing operation is arranged so that a counter for counting the clock pulses starts to operate when the bulb photographing mode is set in the camera and the release operation of the camera is started. A decoder incorporated in the camera decodes the content of the counter and a display instrument displays the output of the decoder in such a manner that the photographer can visually recognize the bulb photographing operation time. Several embodiments of the circuitry for controlling the nature of the display, including timing charts therefor, are set forth.

REFERENCES:
patent: 4134660 (1979-01-01), Sakurada
patent: 4244643 (1981-01-01), Tokutomi
patent: 4286849 (1981-09-01), Uchidoi et al.

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