Electrophotography – Control of electrophotography process – Control of developing
Patent
1994-08-25
1997-02-04
Dang, Thu A.
Electrophotography
Control of electrophotography process
Control of developing
G03G 1500
Patent
active
056004150
ABSTRACT:
An image forming apparatus capable of preventing a toner from being left on a photosensitive member upon turning off a developing bias for jumping development. A phase detecting circuit generates a phase detection signal which becomes H level when the developing bias is positive, whereas becoming L level when the developing bias is negative. A phase controller generates a phase-controlled developing bias off signal to an output controller at a timing when the phase detection signal changes from H level to L level for the first time after the phase controller receives a developing bias off signal from a CPU. Then, the output controller stops oscillation of an oscillating circuit, thereby turning off the developing bias at a timing when the toner has returned from the photosensitive member to a developing unit. Accordingly, the toner is prevented from being left on the photosensitive member upon turning off the developing bias.
REFERENCES:
patent: 4350750 (1982-09-01), Suzuki et al.
patent: 4465360 (1984-08-01), Yamagishi et al.
patent: 4480905 (1984-11-01), Yoshino
patent: 4547064 (1985-10-01), Ammenheuser et al.
patent: 4754304 (1988-06-01), Ohashi et al.
patent: 5229825 (1993-07-01), Yousey et al.
Dang Thu A.
Fuji 'Xerox Co., Ltd.
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