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:
Apr. 12, 2011
Filed:
Nov. 13, 2008
Hironori Kakiuchi, Kobe, JP;
Hideo Fujii, Kobe, JP;
Norihiro Jiko, Kobe, JP;
Kobe Steel, Ltd., Kobe-shi, JP;
Abstract
An optical recording medium of a pitting recording type, to which recording marks are formed by irradiation with a violet laser beam having a wavelength λ in the range of about 380 to about 450 nm, includes a substrate having a surface provided with guide grooves and lands, and a metal recording layer in which recording marks are formed by irradiation with a laser beam. The guide grooves and the lands meet conditions expressed by:λ/18≦D≦λ/11  (1)1.5≦W/W≦3.5  (2)Where λ is the wavelength of the laser beam used for writing and reading, D, is the depth of the grooves, Wis the width of the grooves, and Wis the width of lands formed on the substrate, and the wavelength λ is in the range of 380 to 450 nm.