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:
Sep. 26, 2006
Filed:
Feb. 06, 2003
Kazutomo Miyata, Miyagi, JP;
Teruyuki Ota, Miyagi, JP;
Makoto Watanabe, Miyagi, JP;
Yoshihito Fukushima, Miyagi, JP;
Kazutomo Miyata, Miyagi, JP;
Teruyuki Ota, Miyagi, JP;
Makoto Watanabe, Miyagi, JP;
Yoshihito Fukushima, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
An optical recording and reproducing method is able to record and reproduce information by using an optical system using recording and reproducing light with a wavelength selected in a range of from 780 nm±10 nm and an objective lens with a numerical aperture NA selected in a range of from 0.45±0.01 and records and reproduces first and second optical recording mediums having different recording capacities. The first optical recording medium is constructed by using a substrate with a track pitch Tpbeing selected in a range of from 1.5 μm to 1.7 μm and a groove depth dbeing selected in a range of from 70 nm to 90 nm, and the second optical recording medium is constructed by using a substratewith a track pitch Tpbeing selected in a range of from 1.2 μm to 1.3 μm and a groove depth dof the groovebeing selected in a range of from 150 nm to 180 nm. This, the optical recording medium has compatibility with existing optical discs and has a recording density high enough to record a moving picture.