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HIGH VOLTAGE COMPARATOR FOR PHOTORECEPTOR VOLTAGE CONTROL

IP.com Disclosure Number: IPCOM000025126D
Original Publication Date: 1983-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 97K

Publishing Venue

Xerox Disclosure Journal

Abstract

With reference to Figure 1, there is shown a corona voltage source 12 charging the surface of a photoreceptor 16. A detector 18 provides a signal representative of the voltage on the surface of the photoreceptor 16 to the pre-amplifier 20.

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XEROX DISCLOSURE JOURNAL

HIGH VOLTAGE COMPARATOR FOR PHOTORECEPTOR VOLTAGE CONTROL
A. J. Werner, Jr.

Proposed Classification
U.S. CI. 250/325 Int. CI. HOlt 19/04

34 38

a

b CPLR

OPT. -

                     CORONA 22 SUPPLY

L REF VOLT.

F/G. /

32

With reference to Figure 1, there is shown a corona voltage source 12 charging the surface of a photoreceptor 16. A detector 18 provides a signal representative of the voltage on the surface of the photoreceptor 16 to the pre-amplifier 20.

Any type of non-loading electrostatic detector will work, for example, a variable capacitor, chopper or shutter type modulation, or a very high impedance contacting type such as radioactive probes as long as the detector does not significantly degrade the information on the surface of the photoreceptor.

A comparator 32 is connected to the preamplifier 20. There are two inputs to the comparator 32, namely, line a from amplifier 20 and line b from the high voltage reference supply 22.

Volume 8 Number 5 September/October 1983 39 1

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HIGH VOLTAGE COMPARATOR FOR PHOTORECEPTOR VOLTAGE CONTROL (Cont'd)

The output of the comparator 32 is connected to a DC isolator 34, preferably an optical coupler, in turn connected to the machine digital control 36. The machine digital control can be any standard microprocessor or other suitable logic control. The machine control 36 is also connected to the reference voltage supply 22 and the high voltage corona supply 38.

In operation, the comparator 32 detects the voltage difference between the photoreceptor voltage provided at detector 18 and the reference voltage 22 and provides a digital output depending upon the relative difference between the voltages.

With reference to Figure 2, if the error between the...