Image forming apparatus and method for judging the lifetime...

Details Image forming apparatus and method for judging the lifetime... Image forming apparatus and method for judging the lifetime...

2008-04-15

2008-04-15

Chen, Sophia S. (Department: 2852)

Electrophotography

Diagnostics

Consumable

C399S048000, C399S055000

Reexamination Certificate

active

07359650

ABSTRACT:
The residual potential and charging potential of the surface of a photosensitive drum20,or the charging potential and exposure potential of the surface of the photosensitive drum20are detected by an exposure sensor28.The lifetime of the photosensitive drum20is judged in accordance with the difference between the detected charging potential and residual potential, or the difference between the detected charging potential and exposure potential.

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K. Nagamochi, U.S. PTO Office Action, U.S. Appl. No. 11/882,339, Jan. 24, 2008, 8 pages.

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