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:
Aug. 10, 2004
Filed:
Feb. 12, 2003
Kouji Sonoda, Ome, JP;
Hiroshi Tani, Ninomiya, JP;
Hiroyuki Matsumoto, Chigasaki, JP;
Mitsuhiro Shoda, Odawara, JP;
Toshinori Ono, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The object of this invention is to provide a magnetic disk which has an excellent durability even with a protective film having a small film thickness of 4 nm or less. The magnetic disk of this invention is a magnetic disk comprising a non-magnetic substrate and, provided thereon, a magnetic metal film, carbon protective film and fluorine-containing lubricant film, wherein the carbon protective film is a DLC film having a film thickness of 4 nm or less and the ratio of infrared absorption intensity resulting from the C—H bond near 2,920 cm determined by FT-IR using ATR to infrared absorption intensity resulting from the C—F bond of the lubricant film is 0.035-0.060.