| US 7,611,762 B2 | ||
| Optical recording medium | ||
| Hiroshi Deguchi, Kanagawa (Japan); Hajime Yuzurihara, Kanagawa (Japan); Eiko Hibino, Kanagawa (Japan); Hiroshi Miura, Kanagawa (Japan); Mikiko Abe, Kanagawa (Japan); Shinya Narumi, Kanagawa (Japan); Takeshi Kibe, Kanagawa (Japan); Katsuyuki Yamada, Kanagawa (Japan); and Satoshi Taniguchi, Kanagawa (Japan) | ||
| Assigned to Ricoh Company, Ltd., Tokyo (Japan) | ||
| Filed on Apr. 05, 2006, as Appl. No. 11/397,551. | ||
| Application 11/397551 is a continuation of application No. 10/660564, filed on Sep. 12, 2003, granted, now 7,063,875. | ||
| Claims priority of application No. 2002-268073 (JP), filed on Sep. 13, 2002; application No. 2002-304678 (JP), filed on Oct. 18, 2002; application No. 2003-006246 (JP), filed on Jan. 14, 2003; application No. 2003-014421 (JP), filed on Jan. 23, 2003; and application No. 2003-203216 (JP), filed on Jul. 29, 2003. | ||
| Prior Publication US 2006/0183052 A1, Aug. 17, 2006 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. B32B 3/02 (2006.01) | ||
| U.S. Cl. 428—64.4 [428/64.5; 430/270.13] | 17 Claims |
| 1. An optical recording medium comprising:
a transparent substrate;
a lower protective layer disposed above the transparent substrate;
a recording layer containing a phase-change material, disposed above the lower protective layer;
an upper protective layer disposed above the recording layer; and
an interfacial layer disposed at least one of between the recording layer and the lower protective layer and between the recording
layer and the upper protective layer; and
a sulfuration-inhibiting layer formed over said upper protective layer,
wherein the optical recording medium has a transition linear velocity ranging from 8 m/s to 11 m/s as determined by irradiating
continuous light with a power of 11±1 mW and a wavelength of 660±10 nm using a pickup head with a numerical aperture (NA)
of 0.65, and satisfies the following condition:
ΔR=|Rb−Ra|≤3%
where ΔR is an absolute value of the difference between Ra and Rb; Rb is a reflectance of an unrecorded area, and Ra is a
reflectance of the top of an eye pattern after ten cycles of recording, and
wherein the optical recording medium is recordable with at least two recording modes of a first recording mode and a second
recording mode, in which the first recording mode is that the optical recording medium is rotated at a constant angular velocity
so as to have a linear velocity of 3 m/s to 4 m/s when recording on an innermost track of the optical recording medium and
to have a linear velocity of 8 m/s to 9 m/s when recording on an outermost track of the optical recording medium, and the
second recording mode is that the optical recording medium is rotated at a constant angular velocity so as to have a linear
velocity of 5 m/s to 6 m/s when recording on an innermost track of the optical recording medium and to have a linear velocity
of 13 m/s to 14 m/s when recording on an outermost track of the optical recording medium.
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