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US 6,995,951 B2Granted
Method of planarizing substrate, magnetic head and manufacturing method of the same
AssigneeSony Corporation
InventorsYoshihiko Inoue, Seiichi Ogata
Life of this patent
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Abstract
In order to have a remarkably planarized substrate easily, a glass thin film is predeposited on a surface of a non-magnetic substrate. The non-magnetic substrate is subjected to heat treatment until the glass thin film is softened to a predetermined viscosity, and then the non-magnetic substrate is cured until the glass thin film is hardened.
Claims6
A magnetic head comprising,
- a pair of magnetic core halves;
- each of said halves including a non-magnetic substrate and a metal magnetic thin film deposited over a surface of said non-magnetic substrate;
- said pair of halves being bonded integrally to each other with the one metal magnetic thin film abutting on the other and with a magnetic gap formed between the abutting surfaces;
- the respective surfaces of said non-magnetic substrates over which said metal magnetic thin films are deposited being in nonparallel with said magnetic gap;
- and
- an underlying film made of chromium or chromium oxide deposited between said non-magnetic substrate and said glass thin film,
- wherein said non-magnetic substrate has a glass thin film deposited on the surface thereof over which said metal magnetic film is deposited.
4 more elements
A magnetic head comprising,
- a pair of magnetic core halves,
- each of said halves including a non-magnetic substrate and a metal magnetic thin film deposited over a surface of said non-magnetic substrate,
- said pair of halves being bonded integrally to each other with the one metal magnetic thin film abutting on the other and with a magnetic gap formed between the abutting surfaces,
- the respective surfaces of said non-magnetic substrates over which said metal magnetic thin films are deposited being in nonparallel with said magnetic gap, and
- an underlying film made of chromium or chromium oxide deposited between said non-magnetic substrate and said glass thin film,
- wherein said non-magnetic substrate has a glass thin film deposited on the surface thereof over which said metal magnetic film is deposited, and
- wherein said glass thin films is stretched by thermal shrinkage to planarize the surface of said non-magnetic substrate over which said metal magnetic thin film is deposited.
4 more elements
Dependencies are inferred from the claim text.