Browse Prior Art Database

COROTRON SHIELD AND CATALYTIC FILTER

IP.com Disclosure Number: IPCOM000023661D
Original Publication Date: 1978-Oct-31
Included in the Prior Art Database: 2004-Mar-31

Publishing Venue

Xerox Disclosure Journal

Abstract

This proposal is directed to an improved corona discharge device having incorporated within its field a nickel hydroxide catalyst. It is well known that the production of a corona discharge in air usually generates ozone which adversely affects uniform charging and which, even in very small quantities, is con-sidered toxic to humans. Ozone emissions in an environment are generally controlled by "filtering" devices which are impregnated with catalysts capable of conversion of the ozone to relatively harmless substances. Ozone "filtering" devices for electrostatographic copiers have been located in the copier exhaust stream. These devices are generally charac-terized as fixed head devices; that is, the catalysts are impregnated into a porous support which is integrated within the copier exhaust housing as disclosed in IBM Technical Disclosure Bulletin, Vol. 11:8, January 1969. Alternatively, the catalysts have been incorporated in the corona discharge electrode structure itself as described in U.S. Patent 3,675,096.

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 38% of the total text.

Page 1 of 6

XEROX DISCLOSURE JOURNAL

COROTRON SHIELD AND CATALYTIC
FILTER
Rinoud Henna
George J~ Safford

Proposed ClassifIcation
U~S. Cl. 317/262A
mt. Cl~ HOlg

2

2

FIG. /

3

/11111

Volume 3 Number 5 September/October 1978 323

FIG, 2

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

Page 2 of 6

COROTRON SHIELD AND CATALYTIC FILTER (Cont 'd)

This proposal is directed to an improved corona discharge
device having incorporated within its field a nickel hydroxide
catalyst.

It is well known that the production of a corona discharge in
air usually generates ozone which adversely affects uniform
charging and which, even in very small quantities, is con-
sidered toxic to humans. Ozone emissions in an environment
are generally controlled by "filtering" devices which are
impregnated with catalysts capable of conversion of the ozone
to relatively harmless substances. Ozone "filtering" devices
for electrostatographic copiers have been located in the
copier exhaust stream. These devices are generally charac-
terized as fixed head devices; that is, the catalysts are
impregnated into a porous support which is integrated within
the copier exhaust housing as disclosed in IBM Technical
Disclosure Bulletin, Vol. 11:8, January 1969. Alternatively,
the catalysts have been incorporated in the corona discharge
electrode structure itself as described in U.S. Patent
3,675,096.

In accordance with the present disclosure, the corona-
generating device suitable for application of a substantially
uniform electrostatic charge to a surface comprises a sup-
porting frame, insulating supports arrayed within the
supporting frame for attachment of a corotron wire, an
electrical lead to that corotron wire and a conductive mesh of
foraminous screen enveloping the supporting frame and adapted
for the retention of a catalytically active composition
capable of neutralization of ozone generated during operation
of the corona-generating device. In essence, the corotron
shield is converted into a housing in which supported catalyst
is directly and compactly incorporated. The catalytically
active composition (catalyst) may be supported around the
supporting frame of the corona-generating device in any
suitable manner. The catalyst is preferably supported by the
supporting frame as near as possible to the corona discharge.
A preferred corotron shield and catalytic filter device is
shown in Figures 1 and 2.

Figure 1 illustrates a typical shield for a corotron device
wherein the shield has been trimmed entirely except for a
small skeleton or supporting frame 1, insulating supports 2,
electrical lead 3 and corotron wire 4. Supporting frame 1

               XEROX DISCLOSURE JOURNAL
324 Volume 3 Number 5 September/October 1978

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

Page 3 of 6

COROTRON SHIELD AND CATALYTIC FILTER (Cont'd)

generally embraces a U-shaped structure or skeleton. Insula-
ting supports 2 attached at the ends of the elongated
supporting frame 1 are adapted for supporting corotron wire 4.
Electrical lead 3 connects corotron...