Electrophotographic apparatus having image control means

Details Electrophotographic apparatus having image control means Electrophotographic apparatus having image control means

1992-10-02

1993-10-05

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355214, 355246, G03G 1500

Patent

active

052509885

ABSTRACT:
In an electrophotographic apparatus, densities of toner images of a light reference mark and a dark reference mark are detected by a density sensor, and input voltages such as an illumination power source voltage and an electrostatic charge voltage are varied by small values on the basis of a difference between detected densities and an aimed density, the small values are determined on the basis of a predetermined qualitative model. Subsequently, a line width of the toner image of a reference mark having a striped pattern is detected by a line width sensor and a developer bias voltage is varied by a small value in a similar manner as mentioned above.

REFERENCES:
patent: 4277162 (1981-07-01), Kasahara et al.
patent: 4365894 (1982-12-01), Nakamura
patent: 4967211 (1990-10-01), Colby et al.

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