Image forming apparatus and cartridge, method of sensing...

Details Image forming apparatus and cartridge, method of sensing... Image forming apparatus and cartridge, method of sensing...

2005-09-20

2005-09-20

Brase, Sandra L. (Department: 2852)

Electrophotography

Diagnostics

Consumable

C399S061000

Reexamination Certificate

active

06947678

ABSTRACT:
An image forming apparatus has full- and half-speeds as image forming speeds. In the full-speed mode, a detected voltage value conforming to the electrostatic capacity between a developing roller and plate antenna of a process cartridge is converted to the amount of toner remaining in the apparatus. In the half-speed mode, on the other hand, the amount of remaining toner is found using a value obtained by adding a correction value δ to the detected voltage value conforming to the electrostatic capacity between the developing roller and the plate antenna. As a result, the amount of toner can be sensed accurately even if the electrification conditions of an image carrier change.

REFERENCES:
patent: 5235384 (1993-08-01), Oka et al.
patent: 5923917 (1999-07-01), Sakurai et al.
patent: 6275665 (2001-08-01), Miyashiro
patent: 6282384 (2001-08-01), Saito et al.
patent: 6343193 (2002-01-01), Matsumoto et al.
patent: 6349184 (2002-02-01), Otomo
patent: 2002/0127024 (2002-09-01), Matsumoto et al.

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