Image forming device with image density control

Details Image forming device with image density control Image forming device with image density control

2006-06-13

2006-06-13

Chen, Sophia S. (Department: 2852)

Electrophotography

Diagnostics

By inspection of copied image

C399S049000, C399S055000

Reexamination Certificate

active

07062180

ABSTRACT:
An image forming device having a developing unit for visualizing an electrostatic latent image formed on an image carrying body by utilizing a developing agent containing toners and carriers which transfers a toner image to a recording medium to obtain a record image. A patch sensor is provided for detecting the image density of the record image, and it controls toner density stabilization control and an adjustment value and bias voltage in the developing unit according to a value detected by the patch sensor and a value of current flowing in the image carrying body from the developing unit. Thereby, an image forming device is provided which performs stable image density control when a problem is caused during processing of a predetermined number of printing pages, even when a deterioration of the image due to an abnormal property change of a developing agent is caused.

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