Calibration apparatus for a light source used for exposing photo

Details Calibration apparatus for a light source used for exposing photo Calibration apparatus for a light source used for exposing photo

1989-04-21

1991-06-04

Lall, P. S.

Boots, shoes, and leggings

36457101, 356404, 356443, 382 41, G03B 2780, G01J 350

Patent

active

050219790

ABSTRACT:
Apparatus creates an image on photographic film in which the light intensity of the light source for exposing the film is calibrated to a predetermined value by measuring the light intensity of the light exposure while varying the digital form of the drive signal for controlling the intensity. A successive approximation sequence is used until the intensity approximates the predetermined value.

REFERENCES:
patent: 4646252 (1987-02-01), Terashita
patent: 4666307 (1987-05-01), Matsumoto et al.
patent: 4809198 (1989-02-01), Terashita
patent: 4855940 (1989-08-01), Richardson et al.
patent: 4884221 (1989-11-01), Sugiyama et al.

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