US 7,321,543 B2 | ||
Optical information recording medium | ||
Hiroyasu Inoue, Tokyo (Japan); Koji Mishima, Tokyo (Japan); Masaki Aoshima, Tokyo (Japan); Hideki Hirata, Tokyo (Japan); and Hajime Utsunomiya, Tokyo (Japan) | ||
Assigned to TDK Corporation, Tokyo (Japan) | ||
Filed on Aug. 24, 2004, as Appl. No. 10/923,674. | ||
Claims priority of application No. 2003-208549 (JP), filed on Aug. 25, 2003. | ||
Prior Publication US 2005/0047303 A1, Mar. 03, 2005 | ||
Int. Cl. G11B 7/24 (2006.01) |
U.S. Cl. 369—275.1 [369/288] | 6 Claims |
1. An optical information recording medium for recording and reproducing record data, comprising:
a substrate; and
a recording layer formed on the substrate, for having a laser beam irradiated thereto for recording and reproduction of the
record data, and
a light transmitting layer formed in a manner covering the recording layer,
wherein the recording layer including a first recording film formed of a first material containing Si as a main component,
and a second recording film formed of a second material containing Zn as a main component and having Cu added thereto, the
second recording film being formed in the vicinity of the first recording film, and
wherein the laser beam is irradiated to the recording layer from a light transmitting layer side, wherein the second material
has Cu added thereto in an amount not less than 10 at % and less than 50 at %.
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