Electric heating – Metal heating – By arc
Patent
1998-01-08
2000-04-11
Mills, Gregory
Electric heating
Metal heating
By arc
21912172, 21912169, 21912185, 2960307, B23K 2608
Patent
active
06049056&
ABSTRACT:
A thin film conductive line is formed between MR pads on an MR head for protecting an MR sensor from electrostatic discharge (ESD) during assembly steps between row level fabrication of the head and prior to merge of a head stack assembly with a disk stack assembly. The conductive line may have a reduced thickness delete pad. A laser beam having a fluence sufficient to sever the conductive line at the delete pad but insufficient to damage or cause debris from structure underlying or surrounding the conductive line is used to sever the conductive line. The method traverses minimum energy, short laser pulses at a high pulse rate across the line, the melted material withdrawing from the melted area and being heaped on top of adjacent portions of the delete pad by surface tension and the melted material cooling to room temperature before the next pulse so that there is no cumulative heating and therefore no damage to or debris from the underlying structure. The conductive material of the line is incrementally plowed to each side of a severed path by successive overlapping laser pulses so that when the series of laser pulses has traversed the width of the delete pad the conductive line has been severed.
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Balamane Hamid
Poon Chie Ching
Robertson Neil Leslie
Tam Andrew Ching
International Business Machines - Corporation
Johnston Ervin F.
Mills Gregory
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