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:
Jun. 01, 2010
Filed:
Jul. 03, 2008
Tetsuya Kondo, Kanagawa-ken, JP;
Kenji Oishi, Yokohama, JP;
Tetsuya Kondo, Kanagawa-ken, JP;
Kenji Oishi, Yokohama, JP;
Victor Company of Japan, Limited, Yokohama, JP;
Abstract
An information recording mediumat least comprises a substratehaving a microscopic pattern, which is constituted by a shape of continuous substance of approximately parallel grooves formed with a groove section G and a land section L alternately, a recording layerformed on the microscopic patternand a light transmission layerformed on the recording layer. The microscopic patternis formed so as to satisfy a relation of P<λ<NA and a thickness of the light transmission layeris within a range of 0.07 to 0.12 mm, wherein P is a pitch of the groove section G or the land section L, λ is a wavelength of reproducing light beam and NA is a numerical aperture of an objective lens. Further, there provided an information recording medium, which is improved in cross erase and recorded in high density, and a reproducing apparatus and a recording apparatus for the information recording medium.