Automatic exposure device

Details Automatic exposure device Automatic exposure device

1984-07-27

1985-09-10

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

G03B 2772

Patent

active

045402795

ABSTRACT:
An automatic exposure device wherein the quantity of light from an exposure lamp is detected by lamp light quantity detecting means, while the reflected light from a region of a document located forwardly of a region of the document being exposed is received by density detecting means, the output signal from said lamp light quantity detecting means being used as an input by reference signal producing means which produces a reference signal, the output signal from said density detecting means and the reference signal being used as inputs by correcting means which corrects the output signal from the density detecting means in accordance with an increase in the quantity of light from the lamp, the output signal from said correcting means being used as an input by lamp control means which controls conducting-angle of the exposure lamp.

REFERENCES:
patent: 3764210 (1973-10-01), Nakamura
patent: 4124294 (1978-07-01), Nakamura
patent: 4124295 (1978-11-01), Gardiner
patent: 4153364 (1979-05-01), Suzuki et al.
patent: 4161363 (1979-07-01), Kahle
patent: 4200391 (1980-04-01), Sakamoto et al.
patent: 4304486 (1981-12-01), Cormier et al.
patent: 4354758 (1982-10-01), Futaki
patent: 4378153 (1983-03-01), Nishimura et al.
patent: 4383758 (1983-05-01), Honda
patent: 4390266 (1983-06-01), Uchida

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