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:
Mar. 27, 2012
Filed:
Jul. 16, 2007
Takashi Kikukawa, Tokyo, JP;
Koji Mishima, Tokyo, JP;
Hidetake Itoh, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A multilayer recording medium has a three-layered structure for an increased capacity, including an Llayer, an Llayer, and an Llayer in order from the side farthest away from the incident surface of laser light. The recording layers are made of respective recording film materials selected so that the recording films of the recording layers have respective recording-reaction temperatures T, T, and T, where T≦T≦Tand T<T. This makes the recording sensitivities of the respective recording layers substantially the same and, by extension, the optimal recording powers of the laser light for the respective recording layers substantially the same so that the recording power of the laser light necessary for recording information on the Llayer in particular is prevented from becoming excessively high.