Electrophotography – Control of electrophotography process – Color balance
Patent
1997-10-17
1999-04-13
Brase, Sandra L.
Electrophotography
Control of electrophotography process
Color balance
399231, G03G 1501
Patent
active
058936580
ABSTRACT:
A method and apparatus for minimizing image banding and for registering multiple image planes of a single image on a receptor drum in electrographic systems. The system for registering multiple image planes of a single image in an electrographic system includes a receptor drum capable of capturing two or more overlaying image planes, an exposure device for forming overlaying image planes on the receptor drum, and at least one developer station transferring a developer to the receptor drum corresponding to each of the overlaying image planes. A measuring device is provided for measuring the rotational position of the receptor drum. A drive mechanism is provided for controlling a motor coupled to the receptor drum by at least one drive belt. A closed loop positioning system is coupled to the measuring device and the drive mechanism. The closed loop positioning system is capable of modulating the angular velocity of the receptor drum to achieve image plane registration of the two or more image planes. The system is capable of achieving image plane registration error of preferably about 100 micrometers or less, more preferably about 50 micrometers or less, and most preferably about 20 micrometers or less. The system is capable of achieving image plane registration error of about .+-.0.5 scan lines or less.
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Bury Michael R.
Edwards William D.
Kellie Truman F.
Brase Sandra L.
Weimer William K.
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