Light measuring device

Details Light measuring device Light measuring device

1981-09-11

1984-08-14

McGraw, Vincent P.

Optics: measuring and testing

Photometers

Photoelectric

354432, 250209, G01J 142

Patent

active

044653697

ABSTRACT:
A simplified multi-light measuring device in a photographic system capable of measuring an object field divided into plural areas. The device comprises register means (e.g. 100-500) comprising plural registers for storing plural photoelectric output signals from the plural areas as digital data; reference output generating means (e.g. 60) for generating a reference output signal for determining digital data to be stored in the register means; comparator means (e.g. 21-25) for comparing each of the plural photoelectric output signals with the reference output signal and providing a corresponding output signal; and retaining means for retaining, in response to the output signal from the comparator means, digital data stored in a corresponding register of the register means.

REFERENCES:
patent: 4092652 (1978-05-01), Ito et al.
patent: 4251804 (1981-02-01), Schardina et al.
patent: 4309091 (1982-01-01), Fukuhara et al.
Barnes, "Improve Single-slope A/D Accuracy", Electronic Design 2, Jan. 18, 1973, pp. 58-62.

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