Browse Prior Art Database

STARTING APPARATUS FOR FLASHLAMPS

IP.com Disclosure Number: IPCOM000023690D
Original Publication Date: 1978-Oct-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 504K

Publishing Venue

Xerox Disclosure Journal

Abstract

Flashlamp applications, such as those practiced in image expo-sures or toner image fixing, generally require high-voltage trigger apparatus to initiate the gas breakdown for the primary electric discharge, which produces the required optical radiative energy. High trigger voltage, however, has disadvantages associated therewith, such as the introduction of electromagnetic interference to adjacent equipment such as digital computers and control logic electronics which can cause malfunctions. It also potentially introduces high voltage hazard to operating personnel; potential arc-over which can cause damage to the related apparatus such as an optical cavity or even the lamp itself.

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XEROX DISCLOSURE JOURNAL

STARTING APPARATUS FOR FLASHLAZ4PS

ProposedPhijit Jalichandra Classification

U.S. Cl. 313/198
mt. Cl. HOlj 17/00

Flashlamp applications, such as those practiced in image expo-
sures or toner image fixing, generally require high-voltage
trigger apparatus to initiate the gas breakdown for the
primary electric discharge, which produces the required
optical radiative energy. High trigger voltage, however, has
disadvantages associated therewith, such as the introduction
of electromagnetic interference to adjacent equipment such as
digital computers and control logic electronics which can
cause malfunctions. It also potentially introduces high
voltage hazard to operating personnel; potential arc-over
which can cause damage to the related apparatus such as an
optical cavity or even the lamp itself.

The present invention reduces the voltage level required to
initiate the flashlamp discharge. Referring to the figure, a
gaseous discharge device 1 (linear flashtube) has a cathode 2
and an anode 3 spaced from each other within an insulating
container 4 which is filled with a gaseous medium 5. A third
electrode 6 is placed within the same container 4 and in

Volume 3 Number 5 September/October 1978 321

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STARTING APPARATUS FOR FLASHLAMPS (Cont' d)

proximity to the cathode 2. The third electrode 6, made from electron-emitting material, is constructed in such a way that when its lead-in wires are connected to the power source E3
through the switch S., it will be heated up to high tempera-
tures to emit sufficibnt numbers of electrons. The switch S
is then closed, applying a negative potential from the powe supply L

      1 to the cathode 2. As soon as the plasma discharge is establisfied between the cathode 2 and the third electrode 6, the switch S.~ is opened, disabling the power supply E

.

2Through the ute of the third electrode 6 and the appropriate operation of the power supplies E and E

3 and switches S and
S., the cathode 2 is so conditionla that a high voltage $ulse cónventionally requ...