Exposure time indication apparatus

Details Exposure time indication apparatus Exposure time indication apparatus

1974-09-06

1976-03-16

Heyman, John S.

Optics: measuring and testing

Photometers

Photoelectric

250214R, 307311, G01J 144

Patent

active

039443701

ABSTRACT:
A voltage proportional to the APEX indication quantity for exposure time is coupled to one terminal of a meter through a buffer stage transistor. Circuit means produce a reference potential which is applied to the other terminal of the meter. The buffer stage transistor is biased by circuitry including a feedback stage transistor with the biasing being such that substantially constant collector current operation is ensured.

REFERENCES:
patent: 3518438 (1970-06-01), Hart et al.
patent: 3723014 (1973-03-01), Nanba
patent: 3753388 (1973-08-01), Toyoda
patent: 3829866 (1974-08-01), Nobushawa

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