Apparatus for determining shutter speed adapted for a photograph

Details Apparatus for determining shutter speed adapted for a photograph Apparatus for determining shutter speed adapted for a photograph

1983-11-10

1984-10-09

Adams, Russell E.

354464, 354 79, G03B 708

Patent

active

044758022

ABSTRACT:
A shutter speed determining apparatus adapted for a photographing apparatus in a microscope includes a photo multiplier as photoelectric element. The photo multiplier receives light transmitted through an objective lens and transforms the light into an electric signal. The output signal from the photo multiplier is compared with a reference signal which has two different levels, high and low. When the output signal is higher than the high reference level, a first signal is produced and when it is lower than the lower reference level, a second signal is produced. When the first signal is produced, the sensitivity of the photo multiplier is decreased. On the contrary, when the second signal is produced, the sensitivity is increased up. A correction coefficient is produced in accordance with the sensitivity of the photo multiplier. An arithmetic unit determines a proper shutter speed from the output of the photo multiplier and, in addition, the output of correction coefficient output circuit.

REFERENCES:
patent: 2450288 (1948-09-01), Maisch
patent: 3106129 (1963-10-01), Frenk et al.
patent: 3130634 (1964-04-01), Kropp et al.
patent: 3386358 (1968-06-01), Kropp
patent: 3872303 (1975-03-01), Jakubowski et al.
patent: 3999060 (1976-12-01), Skagerlund
patent: 4048510 (1977-09-01), Clarke et al.
patent: 4318599 (1982-03-01), Elger
"Automatic Gain Control", W. W. Hardin, IBM Tech. Disclosure, vol. 4, No. 12, May 1962.

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