Method of producing a core for magnetic head
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United States of America Patent
Stats
-
Jun 21, 1988
Grant Date -
N/A
app pub date -
Mar 30, 1987
filing date -
Apr 2, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A core for magnetic head, which has a surface roughness of not higher than 2 .mu.m in the side wall of a groove for defining the track width of the core, can be obtained by subjecting at least a portion, which defines the track width, of a gapped bar made of ferrite and having a coil turn hole and a magnetic gap, to a laser-induced etching under a condition that a laser light having a power of 50-1,100 mW and a focused beam diameter of not larger than 20 .mu.m is irradiated to at least the track width-defining portion at a scanning speed of 2-110 .mu.m/sec in a halogen gas- or halide gas-containing atmosphere kept to a gas pressure of 10-200 Torr.
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