Browse Prior Art Database

OPTICALLY COUPLED CHARGE MONITORING DEVICE

IP.com Disclosure Number: IPCOM000023726D
Original Publication Date: 1978-Dec-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 250K

Publishing Venue

Xerox Disclosure Journal

Abstract

An optoelectric device is described which is capable of monitoring the amount of charge a dicorotron deposits on a photoreceptor. In the figure, AC power supply 2 is coupled to corona wire 3 which is coated with dielectric 4. Since corona wire 3 is dielectrically coated, the net DC current out of the wire is zero, The amount of charge flowing from the wire to the plate 5, therefore, equals the amount of charge flowing from the wire to the biased shield 6 which is maintained at a constant high voltage by the diode rectification of the AC potential of the wire, The charge leaving the biased shield has to be supplied by the diode 7,and this flow is monitored by the neon lamp 8 which is in series with it, The intensity of the flow of the lamp is a measure of the actual DC charging of the dicorotron and can be optically coupled to a photo-transistor 9 which by way of feedback can control the power supply. It is thus possible to maintain a constant charging of the plate rather than keeping the sum of the charge deposited both on the plate and the shield constant as is the usual case,

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

OPTICALLY COUPLED, CHARGE
MONITORING DEVICE
T,G, Davis
D. Sand

Proposed Classification
U.S. Cl. 361/230
mt. Cl. HOlt 19/00

An optoelectric device is described which is capable of
monitoring the amount of charge a dicorotron deposits on a
photoreceptor. In the figure, AC power supply 2 is coupled to
corona wire 3 which is coated with dielectric 4. Since corona
wire 3 is dielectrically coated, the net DC current out of the
wire is zero, The amount of charge flowing from the wire to
the plate 5, therefore, equals the amount of charge flowing
from the wire to the biased shield 6 which is maintained at a
constant high voltage by the diode rectification of the AC
potential of the wire, The charge leaving the biased shield
has to be supplied by the diode 7,and this flow is monitored by
the neon lamp 8 which is in series with it, The intensity of
the flow of the lamp is a measure of the actual DC charging of
the dicorotron and can be optically coupled to a photo~-
transistor 9 which by way of feedback can control the power
supply. It is thus possible to maintain a constant charging
of the plate rather than keeping the sum of the charge
deposited both on the plate and the shield constant as is the
usual case,

Volume 3 Number 6 November/December 1978 451

[This page contains 1 picture or other non-text object]

Page 2 of 2

8L61 q~a/~qweAoN 9 ~quin~ £ ~UiflTOA

~flZNHflOI~~HflSOrIDSIUXO~X

[This page contains 1 picture or other non-text object]