| US 7,485,355 B2 | ||
| Optical information recording medium and method for manufacturing the same | ||
| Hideki Kitaura, Souraku-gun (Japan); and Noboru Yamada, Osaka (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Appl. No. 10/529,298 PCT Filed Sep. 30, 2003, PCT No. PCT/JP03/12464 § 371(c)(1), (2), (4) Date Mar. 25, 2005, PCT Pub. No. WO2004/032130, PCT Pub. Date Apr. 15, 2004. |
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| Claims priority of application No. 2002-288594 (JP), filed on Oct. 01, 2002. | ||
| Prior Publication US 2006/0072439 A1, Apr. 06, 2006 | ||
| Int. Cl. B32B 3/02 (2006.01) | ||
| U.S. Cl. 428—64.4 [428/64.5; 428/64.6; 439/270.13] | 11 Claims |
| 1. An optical information recording medium, comprising:
a substrate; and
at least n information layers (where n is an integer of at least 3) provided on the substrate,
wherein each of the n information layers comprises a recording layer comprising Te, O and M, where M denotes at least one
element selected from the group consisting of Al, Si, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Ru, Rh, Pd, Ag,
In, Sn, Sb, Hf, Ta, W, Re, Os, Ir, Pt, Au and Bi, and
when the n information layers are represented as a first to a n-th information layers from a laser beam incident side, assuming
that C(j) % denotes a concentration of oxygen atoms contained in the recording layer included in a j-th information layer
(where j is an integer satisfying 1≤j≤n−1), C(1) to C(n−1) satisfy the following relationships:
C(1)≧C(2)≧ . . . ≧C(n−2)≧C(n−1), and
C(1)≠C(n−1).
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