Exposure lamp control for image forming apparatus

Details Exposure lamp control for image forming apparatus Exposure lamp control for image forming apparatus

1984-07-09

1986-03-04

Prescott, A. C.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 55, 355 69, G03G 1500

Patent

active

045737878

ABSTRACT:
In a copy machine with a variable copy magnification, light reflected from a document, which is exposed by an exposure lamp, is led to a photosensitive drum to form thereon a copy image of a predetermined size and also led to a photo detecting circuit to detect a density of the document and to control an amount of exposure. An exposure control circuit of the copy machine comprises a magnification setter for generating a magnification signal dependent on a magnification as selected, a control signal generating circuit for generating a control signal according to the magnification signal and the output signal from the photo detecting circuit and a power source circuit for applying a power voltage to the exposure lamp according to the control signal.

REFERENCES:
patent: 3926518 (1975-12-01), Berry et al.
patent: 4200391 (1980-04-01), Sakamoto et al.
patent: 4354758 (1982-10-01), Futaki
patent: 4436410 (1984-03-01), Komiya
patent: 4460270 (1984-07-01), Watai et al.
patent: 4474460 (1984-10-01), Suzuki

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