Photocopying – Including fiber optics
Patent
1974-09-06
1976-03-16
Moses, R. L.
Photocopying
Including fiber optics
324 32, 324 72, 355 14, 355 16, G03G 1500
Patent
active
039443540
ABSTRACT:
Apparatus for measuring the surface potential of moving electrostatically charged elements uses at least one electrically conducting detector mounted on the outer periphery of a grounded roller. An insulated ring secured around each end of the roller in an edge contacting relationship with the charged element under measurement provides a friction drive for the roller and maintains the detector in a spaced and non-contacting position from the charged element. As the roller is rotated, the detector is alternately exposed to the charged element and to a grounded shell arranged in a spaced and non-contacting manner from both the charged element and the roller and builds an A.C. voltage on a sampling capacitor. The output of the sampling capacitor is connected to a circuit which determines the envelope of the A.C. voltage and provides a differential D.C. voltage representative of the surface potential of the charged element. This D.C. voltage can be used as a control signal in an electrophotographic copying machine to control the charging, exposing, developing and/or cleaning operations of the machine.
REFERENCES:
patent: 3370225 (1968-02-01), Winder
patent: 3406334 (1968-10-01), Marquart et al.
patent: 3544889 (1970-12-01), Alauzet et al.
patent: 3729675 (1973-04-01), Vosteen
patent: 3852668 (1974-12-01), Hardenbrook et al.
Benwood Bruce R.
Siebenrock Howard D.
Eastman Kodak Company
Hague D. I.
Moses R. L.
LandOfFree
Voltage measurement apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Voltage measurement apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Voltage measurement apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-290201