Exposure amount control device for a copying machine

Details Exposure amount control device for a copying machine Exposure amount control device for a copying machine

1983-10-27

1985-07-02

Gonzales, John

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

355 69, H05B 3909, G03B 2772

Patent

active

045270937

ABSTRACT:
Disclosed is an exposure amount control device for a copying machine comprising an exposure amount control circuit for controlling an exposure amount by controlling light of the exposure lamp for illuminating an original document to be copied and a digital light control signal generator for supplying a digital light control signal of a variable duty factor to the exposure amount control circuit. The digital light control signal generator includes a light intensity increase/decrease setting circuit and an oscillator for generating an oscillation output of a variable oscillation period in accordance with a light intensity signal from the light intensity increase/decrease setting circuit. The oscillation output of the oscillator is converted to an on-off light signal, which is supplied to the exposure amount control circuit as the digital light control signal. Thus, the digital light control signal generator is perfectly electrically isolated from a primary power supply circuit of the exposure amount control circuit and a highly safe exposure amount control device with a stable control ability due to an on-off light signal is provided.

REFERENCES:
patent: 4359670 (1982-11-01), Hosaka et al.

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