Image-forming device that sets image-forming conditions

Details Image-forming device that sets image-forming conditions Image-forming device that sets image-forming conditions

2007-11-06

2007-11-06

Ngo, Hoang (Department: 2852)

Electrophotography

Control of electrophotography process

Of plural processes

C399S046000

Reexamination Certificate

active

11102684

ABSTRACT:
A control section sets the transfer bias level applied between a transfer roller and a photosensitive drum in the printer to a “ghost generation level.” The control section forms a test pattern on the recording medium by applying a transfer bias set to the ghost generation level in order to transfer a toner image onto the recording medium. A density sensor detects the density of the toner image deposited in a non-image-forming region when the test pattern is formed. The control section estimates a transfer bias level, at which ghosts will not occur, based on the ghost generation level and the density level of the toner image in the non-image-forming region, and sets this estimated value as the transfer bias level for forming images.

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patent: A-10-186877 (1998-07-01), None
patent: A-2003-233253 (2003-08-01), None

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