Method and apparatus for controlling an image density

Details Method and apparatus for controlling an image density Method and apparatus for controlling an image density

2008-04-14

2009-06-09

Gray, David M (Department: 2852)

Electrophotography

Control of electrophotography process

Of plural processes

C399S053000

Reexamination Certificate

active

07546046

ABSTRACT:
An amount of toner transfer on a reference pattern is calculated by using an optical detecting unit that detects both regular reflection light and diffuse reflection light from a detection target simultaneously, based on a relative ratio between a value obtained by subtracting a result of multiplying a “diffuse reflection output” by a “minimum value of a ratio between a regular reflection output and the diffuse reflection output” from the “regular reflection output” of the density detection reference pattern, and a value obtained by subtracting a result of multiplying the “diffuse reflection output” by a “minimum value of a ratio between the regular reflection output and the diffuse reflection output” from the “regular reflection output” in the background of a transfer belt or an intermediate transfer body.

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