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:
Mar. 06, 2001
Filed:
Mar. 16, 1999
Yasuo Hira, Yokohama, JP;
Tamaki Toba, Yokohama, JP;
Hirotaka Imayama, Kawasaki, JP;
Atsuko Ohkawa, Yokohama, JP;
Masayasu Fujisawa, Kanagawa-ken, JP;
Kazuo Nate, Machida, JP;
Hideki Sonobe, Odawara, JP;
Saburo Suzuki, Minamiashigara, JP;
Eisei Togawa, Odawara, JP;
Hiroshi Ishizaki, Odawara, JP;
Yoshiki Hagiwara, Hadano, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A magnetic head element has one or more rails formed on the surface thereof. Each rail is formed so as to have a tapered angle of 55-85°. To form such a rail, ion milling is conducted; the rail substrate used is allowed to have an inclination angle to 15-60° and is rotated; and there is used, as the ion milling gas, a fluorinated hydrocarbon (e.g., CH,FCF,) gas alone or a mixed gas of said fluorinated hydrocarbon gas and Ar, SF,or the like. Accordingly, a magnetic head rail shape gives a small variation in flying height between magnetic bead and magnetic disc.