Document counter and endorser with light source control

Details Document counter and endorser with light source control Document counter and endorser with light source control

1989-04-07

1990-03-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

G01J 132

Patent

active

049068423

ABSTRACT:
Apparatus for examining documents moved along a path between a light source normally energized at a first level and a photodetector, in which a first potential proportional to the long term average value of the photodetector output with no document between the light source and the photodetector and a second potential proportional to the instantaneous value of the photodetector output are compared to energize the light source at a higher level by shorting part of the resistance in the normal energizing circuit when the second potential falls below a predetermined percentage of the first potential.

REFERENCES:
patent: 3944979 (1976-03-01), Kwok
patent: 4225808 (1980-09-01), Saraceni
patent: 4406530 (1983-09-01), Hasegawa et al.
patent: 4727290 (1988-02-01), Smith et al.
patent: 4745272 (1988-05-01), Andreatti, Jr.
patent: 4808809 (1989-02-01), Hayakawa

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