Photocopying – Contact printing – Light boxes
Patent
1989-07-27
1992-03-17
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355246, G03G 2100
Patent
active
050972936
ABSTRACT:
In an electrostatic recording apparatus according to the present invention, while a photosensitive drum and a drum cleaner are enabled, but an electrostatic latent image is not formed on the drum and a developing unit is not operated yet, a light emission level of an LED, which is controlled so as to keep a received light level of a photo-diode which receives the LED's light reflected from the drum, is measured as a first light emission level. If the first light emission level exceeds a predetermined level it is determined that the detector composed of the LED and the photodiode is contaminated and requires cleaning. Next, the developer is enabled while the latent image is not formed yet. The light emission level to keep the same received light level is measured as a second light emission level. If a difference between the first and second light emission levels exceeds a predetermined limit level, it is determined that the photosensitive drum and/or carrier in developer is deteriorated. Thus, an interval for cleaning the detector is extended, and the deterioration of the drum and/or the carrier is distinguished from the contamination of the detector.
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Seto Fumiaki
Takenaka Yutaka
Fujitsu Limited
Grimley A. T.
Smith Matthew S.
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