Image forming apparatus capable of varying charge amount in acco

Details Image forming apparatus capable of varying charge amount in acco Image forming apparatus capable of varying charge amount in acco

1995-06-22

1997-01-14

Dang, Thu A.

Electrophotography

Control of electrophotography process

Control of developing

399 50, G03G 1502

Patent

active

055945333

ABSTRACT:
A toner density sensor detects the state where a toner cartridge is empty and the toner density in a developing unit is therefore low. In accordance with the sensing output of the toner density sensor, the surface potential of a photosensitive drum is decreased. By this control, the carriers of the developing agent are prevented from being attracted onto the photosensitive drum during the period between the time when the toner cartridge becomes empty and the toner density begins to decrease and the time when the copying operation stops due to the toner empty state. Hence, the images formed during that period are not poor in quality.

REFERENCES:
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patent: 4468112 (1984-08-01), Suzuki et al.
patent: 4816871 (1989-03-01), Oushiden et al.
patent: 5006896 (1991-04-01), Koichi et al.
patent: 5250959 (1993-10-01), Yamada et al.
patent: 5315352 (1994-05-01), Nakane et al.
patent: 5402209 (1995-03-01), Itoyama et al.

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