Thin film protective coating with two thickness regions

Details Thin film protective coating with two thickness regions Thin film protective coating with two thickness regions

1998-02-25

2000-07-11

Pianalto, Bernard

Coating processes

Magnetic base or coating

Magnetic coating

20419235, 427131, 427259, 427264, 427270, 427272, 427282, 427402, 427468, 427526, 427534, B05D 512

Patent

active

060869496

ABSTRACT:
A thin film disk and a method for producing the disk having an overcoat with two thickness regions. The thicker overcoat region can be used as a start/stop or loading zone and the thinner overcoat region can be used over the data recording area. This provides increased wear resistance while allowing improved magnetic performance through a reduction in the thickness of the overcoat over the data recording area. The dual thickness regions can be formed using different embodiments of the method. One method sputter deposits a relatively thick layer of overcoat material over the entire disk surface, masks off the portion of the disk for the thick layer, etches the unmasked area to reduce or eliminate the overcoat from the unmasked area, then deposits a second relatively thin layer of overcoat material over the entire surface.

REFERENCES:
patent: 4259392 (1981-03-01), Suzuki
patent: 5336531 (1994-08-01), Nakayama et al.
patent: 5356522 (1994-10-01), Lal et al.
patent: 5432012 (1995-07-01), Lal et al.
patent: 5496632 (1996-03-01), Yamaguchi et al.
patent: 5520981 (1996-05-01), Yang et al.
patent: 5580667 (1996-12-01), Lal et al.

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