Dual mode image density controlling method

Details Dual mode image density controlling method Dual mode image density controlling method

1985-02-22

1986-10-28

Prescott, A. C.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3DD, 118665, 118688, 118653, G03G 1508

Patent

active

046195220

ABSTRACT:
A dual mode method for controlling the density of a toner image is disclosed for an electrophotographic process. In the first mode, an electrostatic latent image is formed on a photosensitive member from a reference pattern having a predetermined reflectance, the latent image is developed, the density of the developed image is detected, and this density information is used to replenish toner to the developer. A second mode can be actuated in which the photosensitive member is excited to form a region of approximately saturating residual potential which is then developed under a predetermined bias potential, the density of the thus developed image is detected and the density information is used to determine whether the developing step is functioning properly.

REFERENCES:
patent: 4179213 (1979-12-01), Queener
patent: 4248527 (1981-02-01), Akiyama et al.
patent: 4313671 (1983-02-01), Kuru
patent: 4348100 (1982-09-01), Snelling
patent: 4377338 (1983-03-01), Ernst

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