Image forming apparatus and a controlling method of an image for

Details Image forming apparatus and a controlling method of an image for Image forming apparatus and a controlling method of an image for

1997-07-18

2000-09-05

Beatty, Robert

Electrophotography

Control of electrophotography process

Of plural processes

399 58, G03G 1500

Patent

active

061155616

ABSTRACT:
The present invention corrects and controls both short-term changes in the density and gradation of the obtained image due to changes in the environment and the like, and long-term changes in the density and gradation of the obtained image due to changes in the properties of the photosensitive member and the developer during a long use period using two kinds of density control operations. In first density control, a predetermined pattern is formed on a recording material via a visual-image forming process, and a contrast potential and an LUT (look-up table) for gamma conversion are set based on the value of density of the formed pattern and in a second density control, control is performed by controlling an amount of replenishment of a toner according to a first reference value, which is corrected based on the difference between the value of density of a pattern formed on a photosensitive drum and a second reference value, thereafter a pattern is formed on the photosensitive drum by driving the visual-image forming process with a parameter set in the first density control, and the first and second reference values are corrected based on the value of density of the formed pattern.

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patent: 5710958 (1998-01-01), Raj
patent: 5749019 (1998-05-01), Mestha

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