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:
May. 23, 2006
Filed:
Feb. 07, 2001
Noriaki Oshima, Yokohama, JP;
Hideki Oono, Yonezawa, JP;
Takashi Taniguchi, Sagamihara, JP;
Keiichiro Nishizawa, Yokohama, JP;
Noriaki Oshima, Yokohama, JP;
Hideki Oono, Yonezawa, JP;
Takashi Taniguchi, Sagamihara, JP;
Keiichiro Nishizawa, Yokohama, JP;
Tosoh Corporation, Yamaguchi-ken, JP;
Abstract
An optical recording medium comprising at least a land and a groove where information-recording/reproducing is carried out by a flying type optical head, The optical recording medium keeps the flying height of the flying optical head constant in the entire region of the recording/reproducing area, and is provided with at least one characteristic among the following characteristics: RP which is dependent on land and groove parameters and the flying height satisfies the relation of H>Rp 0.1 H; centerline mean roughness Ra is in the range of 0.2 nm Ra 2.0 nm, and the layer thickness of a liquid lubricant layer satisfies the relation of t Ra; the relation of ΔRp≦λ/16 NA which is dependent on the effective numerical aperature, laser wavelength and surface parameters is satisfied where all parameters in the formula are defined in the specification; and the height of a header area is different from the height of a land portion.