Title:
REWRITABLE OPTICAL INFORMATION MEDIUM
Document Type and Number:
WIPO Patent Application WO1999067778
Kind Code:
A3
Abstract:
A description is given of a disc-shaped rewritable optical information medium having an IPIM stack (2) comprising a phase-change recording layer (4) sandwiched between two dielectric layers (3, 5), and a metal mirror layer (6). The thickness of the recording layer (4) increases gradually with increasing radius r. As a result, the complete erasure time CET of recorded marks decreases from the inner radius r>i< to the outer radius r>o<. Therefore, at a point closer to the outer radius marks can be recorded at a higher linear speed than at a point closer to the inner radius. This effect ensures that the recording medium can be used for recording at a constant angular velocity (CAV).
Inventors:
ZHOU GUO-FU
VAN WOUDENBERG ROEL
VAN WOUDENBERG ROEL
Application Number:
PCT/IB1999/000946
Publication Date:
March 16, 2000
Filing Date:
May 25, 1999
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
PHILIPS SVENSKA AB (SE)
PHILIPS SVENSKA AB (SE)
International Classes:
G11B7/24; G11B7/24035; G11B7/24062; G11B7/243; G11B7/2433; G11B7/2437; G11B7/006; (IPC1-7): G11B7/24
Foreign References:
| EP0766240A2 | 1997-04-02 |
Other References:
PATENT ABSTRACTS OF JAPAN
PATENT ABSTRACTS OF JAPAN
PATENT ABSTRACTS OF JAPAN
PATENT ABSTRACTS OF JAPAN
PATENT ABSTRACTS OF JAPAN
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