The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 02, 2008
Filed:
May. 01, 2006
Yohji Maruyama, Iruma, JP;
Tadayuki Iwakura, Odawara, JP;
Takashi Kawabe, Hitachi, JP;
Makoto Morijiri, Ninomiya, JP;
Hiroshi Fukui, Kanagawa-ken, JP;
Yohji Maruyama, Iruma, JP;
Tadayuki Iwakura, Odawara, JP;
Takashi Kawabe, Hitachi, JP;
Makoto Morijiri, Ninomiya, JP;
Hiroshi Fukui, Kanagawa-ken, JP;
Hitachi Global Technologies Japan, Ltd., Odawara, JP;
Abstract
A magnetic head comprises a retrieving unit for converting magnetic information output from a recording medium into an electric signal, a writing unit having the function of electromagnetic conversion for writing the magnetic information in the recording medium in response to the electric signal, and a first protective film formed on the retrieving unit. A second protective film is formed on the first protective film. The coefficient of linear expansion of the second protective film is reduced in comparison with that of the first protective film. Furthermore, the first protective film is an alumina film; in contrast, the second protective film is a film made of an alumina film containing silicon oxide therein.