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:
Oct. 02, 2012
Filed:
Aug. 14, 2009
Morio Nakatani, Ichinomiya, JP;
Kenji Nagatomi, Kaizu, JP;
Yoshiyuki Matsumura, Anpachi-Gun, JP;
Seiichiro Takahashi, Gifu, JP;
Morio Nakatani, Ichinomiya, JP;
Kenji Nagatomi, Kaizu, JP;
Yoshiyuki Matsumura, Anpachi-Gun, JP;
Seiichiro Takahashi, Gifu, JP;
Sanyo Electric Co., Ltd., Okaka, JP;
Abstract
A recording medium includes at least one recording layer on which information is recorded by multi-photon absorption, and a servo layer disposed in a laminated direction with respect to the recording layer and having a track for guiding a beam spot of laser light having a first wavelength and a beam spot of laser light having a second wavelength along a scanning trajectory. The servo layer and the at least one recording layer constitute a set of layers, and a plurality of sets of layers is formed in the laminated direction. The servo layer is made of a material having a high reflectance with respect to laser light having a third wavelength for generating a servo signal, and low reflectances with respect to the laser light having the first wavelength and the laser light having the second wavelength.