Development device to detect a developing gap

Details Development device to detect a developing gap Development device to detect a developing gap

2005-01-18

2005-01-18

Tran, Hoan (Department: 2852)

Electrophotography

Control of electrophotography process

C399S048000, C399S055000

Reexamination Certificate

active

06845220

ABSTRACT:
A development device includes a developing gap detection function. The development device also includes an organic photoconductive body, a developer conveying body, a DC power supply, an AC power supply, a discharge start voltage detection portion, and a controller. The discharge start voltage detection portion detects a discharge start voltage occurring between the developer conveying body and the organic photoconductive body when a voltage is supplied from the power supply unit in increments at predetermined intervals. The controller obtains a developing gap between the organic photoconductive body and the developer conveying body based on the discharge start voltage detected by the discharge start voltage detection portion, and outputs a developing voltage suitable for the obtained developing gap. Accordingly, the development device having the developing gap detection function detects the developing gap easily and accurately by recognizing the discharge start voltage, and improves image quality by regulating an image forming condition.

REFERENCES:
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patent: 5521683 (1996-05-01), Miyamoto et al.
patent: 20040018025 (2004-01-01), Park et al.
patent: 5-333685 (1993-12-01), None
patent: 2003-162148 (2003-06-01), None

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