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:
Jan. 03, 2012
Filed:
Mar. 20, 2007
Tomoyasu Takaoka, Osaka, JP;
Yoshitaka Sakaue, Osaka, JP;
Rie Kojima, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An information recording medium of the present invention includes N information layers on a substrate (), where N is an integer of 2 or more. Information is recorded/reproduced by irradiating each of the information layers () with a laser beam (). When the N information layers are referred to as a first information layer to an N-th information layer sequentially from the opposite side to a laser beam incident side, the L-th information layer included in the N information layers includes at least a recording layer () capable of undergoing a phase change through laser beam irradiation, a reflective layer (), and a transmittance adjusting layer () in this order from the laser beam incident side, where L is an integer satisfying 2≦L≦N. The transmittance adjusting layer () contains Nb, oxygen (O), and at least one element M selected from Ti, Zr, Hf, Y, Cr, Zn, Ga, Co, Bi, In, Ta, and Ce. In the transmittance adjusting layer (), the content of Nb is at least 2.9 atom %.