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:
Nov. 17, 2009
Filed:
Feb. 26, 2007
Takashi Ohgo, Yokohama, JP;
Itsuro Nakamura, Yokohama, JP;
Takayuki Onizawa, Yokohama, JP;
Naoyuki Nakagawa, Yokohama, JP;
Kenji Oishi, Yokohama, JP;
Takashi Ohgo, Yokohama, JP;
Itsuro Nakamura, Yokohama, JP;
Takayuki Onizawa, Yokohama, JP;
Naoyuki Nakagawa, Yokohama, JP;
Kenji Oishi, Yokohama, JP;
Victor Company of Japan, Ltd., Kanagawa-Ken, JP;
Abstract
An optical disc with a first recording layer has first data pits that include 14T data pits formed thereon in compliance with DVD-ROM specifications. A first reflective film is formed on the first recording layer, whereby the first reflective film has the relationship of 2.3≦Pw/Tf≦14 between the 14T pit width and the first reflective film thickness. The disc also includes a second recording layer having a first surface and an opposed second surface, whereupon second data pits are formed on the first surface in compliance with BD-ROM specifications. A second semi-transparent reflective film is formed on the second recording layer, while a transparent layer having opposed third and fourth surfaces is formed over the second reflective film at the third surface, such that the fourth surface allows a laser beam to pass therethrough in reproduction from either the first or second data pits.