Image forming apparatus with two-speed developing operation...

Details Image forming apparatus with two-speed developing operation... Image forming apparatus with two-speed developing operation...

2005-09-20

2005-09-20

Grimley, Arthur T. (Department: 2852)

Electrophotography

Control of electrophotography process

Control of developing

C399S060000, C399S063000, C399S061000

Reexamination Certificate

active

06947681

ABSTRACT:
An image forming apparatus in which the control of toner supply can be effected well irrespective of an image forming mode (image forming speed). The density of a toner in a developer contained in a developer containing portion is detected by a toner density sensor. A controller controls the supply of the toner to the developer containing portion so that the density of the toner detected by the toner density sensor may assume a predetermined target value. When the last developing operation is executed at an ordinary speed, whereafter next developing operation is executed at a low speed, a toner image of predetermined density is formed, and the density of this toner image is detected by an image density sensor. The controller determines an amount of toner supply by the use of the target value corrected on the basis of the detection output of the image density sensor, and the detection output of the toner density sensor.

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patent: 05134548 (1993-05-01), None

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