Browse Prior Art Database

Arcing Current Control

IP.com Disclosure Number: IPCOM000053087D
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Galetto, LV: AUTHOR

Abstract

Improved definition of eroded spots is achieved by decreasing the marking current after the initial arc has been struck.

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Arcing Current Control

Improved definition of eroded spots is achieved by decreasing the marking current after the initial arc has been struck.

Referring to Fig. 1, metallized paper 1 is marked by eroding the metal coating 2 beneath electrode 3. Marking is initiated by turning on transistor 4 with an input pulse at its base. This action forward biases transistor 5 so that current flows from ground electrode 6 through the metal coating 2, recording the electrode 3, transistor 5, resistor 7 and transistor 4. After the initial arc occurs between electrode 3 and the metal coating, that junction increases in resistance so that transistor 5 becomes back-biased, forcing current through resistor 8. This decreases the electrode current during the remainder of the marking pulse.

Figs. 2a and 2b illustrate the current and voltage waveforms for the initial arc and the discharge portions of the marking pulse.

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