Method of producing a core for magnetic head

Details Method of producing a core for magnetic head Method of producing a core for magnetic head

1989-08-29

1991-01-01

Albritton, C. L.

Electric heating

Metal heating

By arc

156643, 156654, 21912168, B23K 2600

Patent

active

049820656

ABSTRACT:
A core for magnetic head, which has a groove depth of at least 10 .mu.m with a dimensional accuracy not lower than .+-.2 .mu.m in the groove for defining the track of the core, can be obtained by subjecting a gapped bar made of ferrite and/or Sendust to a laser-induced etching wherein a laser beam having a focused beam diameter of not larger than 50 .mu.m, preferably not larger than 20 .mu.m, and a laser power P in a specified range is irradiated at a scanning speed V that is within a range between 2 .mu.m/sec and 200 .mu.m/sec and delimited by the laser power P, in a phosphoric acid or alkali metal hydroxide aqueous solution.

REFERENCES:
patent: 4379022 (1983-04-01), Melchery et al.
patent: 4439294 (1984-03-01), Bril et al.
patent: 4751779 (1988-06-01), Nagatomo et al.
Material Research Society, Pittsburgh, 1989, "Laser Induced Chemical Etching of Composite Structure of Ferrite and Sendext".
Precision Machine Soc., 1985, Autumn Sym. Scientific Lecture Articles, pp. 443-446.
Nikkei Mechanical, 1986, 5.5, (pp. 50-52).
Appl. Phys. A 47, 319-325, (1988), "Wet-Chemical Etching of Mn--Zn Ferrite by Focused Art.sup.+ -Laser Irradiation in H.sub.3 PO.sub.4 ".
Appl. Phys. Lett., vol. 43, No. 2, Jul. 15, 1983, pp. 146-148, "Laser-Controlled Chemical Etching of Aluminum".
Precision Machine Soc., 1985, Spring Sym., Scientific Lecture Articles, (Presentn. No. 404).
Engineering Materials, 33, No. 14, pp. 57-52.

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