Photometering device

Details Photometering device Photometering device

1992-09-23

1994-01-04

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

356222, G01J 144

Patent

active

052763200

ABSTRACT:
A photometering device comprises: a generator for generating an analog voltage output which varies in accordance with a light intensity of an object field and is proportional to an absolute temperature; a reference voltage generator for generating a reference voltage output proportional to an absolute temperature; a switching device for switching the analog voltage output and the reference voltage output; a single output terminal for sequentially outputting the analog voltage output and the reference voltage output switched by the switching device; and an arithmetic operation device having a single analog-digital converter for converting the analog voltage output and the reference voltage output supplied from the single output terminal to digital signals for calculating a photometering value based on the digitally converted analog voltage output and reference voltage output.

REFERENCES:
patent: 4650309 (1987-03-01), Ishida et al.
patent: 4772912 (1988-09-01), Ishida et al.
patent: 4774401 (1988-09-01), Yamada et al.
patent: 4870443 (1989-09-01), Hayakawa et al.
patent: 4969005 (1990-11-01), Tokunaga

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