Method of controlling image density

Details Method of controlling image density Method of controlling image density

1994-06-20

1995-12-19

Beatty, Robert

Photocopying

Contact printing

Light boxes

355246, G03G 2100

Patent

active

054773121

ABSTRACT:
A method of controlling image density includes imaging a pattern of reference density as a toner image on a photoconductor. The density of the toner image is detected by a reflection-type photosensor, and parameters on the image density are adjusted based upon the results of this detection. In this invention, prior to measuring the reference density toner image, the drive current for the reflection-type photosensor is varied, and output from the reflection-type photosensor is measured while no toner is present on the photoconductor. A reference value of the drive current for the reflection-type photosensor which permits output from the reflection-type photosensor to be a predetermined value is determined. Then, the drive current for the reflection-type photosensor for measuring the reference density toner image is set based on the reference drive current value.

REFERENCES:
patent: 4801980 (1989-01-01), Arai et al.
patent: 5006896 (1991-04-01), Koichi et al.
patent: 5097293 (1992-03-01), Seto et al.
patent: 5122835 (1992-06-01), Rushing et al.
patent: 5245390 (1993-09-01), Ishigaki et al.
patent: 5333037 (1994-07-01), Inoue et al.

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