Image formation apparatus including means for detecting and cont

Details Image formation apparatus including means for detecting and cont Image formation apparatus including means for detecting and cont

1984-08-14

1986-01-14

Moses, R. L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 14CH, 355 14E, G03G 1500

Patent

active

045642877

ABSTRACT:
The invention provides an image formation apparatus having a photosensitive drum, primary and secondary chargers which are controlled by first and second high voltage transformers, respectively, a predischarge charger controlled by a predischarge high voltage transformer, a transfer charger controlled by a transfer high voltage transformer, an exposure lamp controlled by a light control circuit, a developing roller which receives a controlled bias voltage from an AC developing bias circuit, a surface potentiometer, and a microprocessor. In preliminary exposure, an original is exposed to light to form an electrostatic latent image on the photosensitive drum. The potential of this latent image is measured by the surface potentiometer so as to detect the potential of the original. Based on the potential of the original and hence a detected density of an image of the original, image formation conditions such as a development bias voltage, corona charge, and an original exposure voltage are corrected.

REFERENCES:
patent: 2956487 (1960-10-01), Giaimo
patent: 4239374 (1980-12-01), Tatsumi et al.
patent: 4248524 (1981-02-01), Takahashi
patent: 4348100 (1982-09-01), Snelling

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