Browse Prior Art Database

AC COROTRONS

IP.com Disclosure Number: IPCOM000024120D
Original Publication Date: 1979-Oct-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 213K

Publishing Venue

Xerox Disclosure Journal

Abstract

When removing charge on application of an AC voltage to the corotron, positive or negative charges can be removed from the surface by flow of current between the surface and the coronode to or from the surface as appropriate. One problem associated with this discharging system is that the system does not naturally have a

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 85% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

AC COROTRONS
P. F. Clark
E. 3. Le Seur
R. C. Marshall
D. 3. Milton

Proposed Classification
U.S. Cl. 250/324

mt. Cl, I-JOlt 19/04

When removing charge on application of an AC voltage to the corotron, positive or negative charges can be removed from the surface by flow of current between the surface and the coronode to or from the surface as appropriate. One problem associated with this discharging system is that the system does not naturally have a null point at zero volts because the system is not inherently balanced; the ionic mechanism by which the ions are created are different during the negative and positive half-cycles. The breakdown or ionizing voltage that must be exceeded between the coronode and the surrounding surfaces is, therefore, not equal in the negative and positive directions. As a result, when using an AC corotron to discharge a surface there is a tendency for a residual charge to remain on the surface.

An AC corotron supply system including a high voltage supply is connected to supply power to the corotron I or 2 and connected in series there is a piecewise linear electrical network 3 arranged to exhibit different electrical characteristics when the applied voltage polarity is reversed. The network 3 comprises a diode 4 and a resistor S connected in parallel. This solves the problem outlined above. The circuit illustrated also incorporates two DC corotrons 6 and a diode 7 and a capacitor 8 providing current rectification in...