EP0977189A1
Expired / Lapsed
EP
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Optical recording method
Assignee: TDK Corp
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Filing: 1999-07-16
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Granted: —
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Expires: 2019-07-16
Abstract
Abstract Deterioration of properties associated with high-density recording is suppressed in the recording of a phase change optical recording medium wherein land or groove is used for the recording track. A method for recording an optical recording medium having a substrate having grooves formed thereon and a recording layer of phase change type on the substrate wherein a groove or a land between two adjacent grooves is used for the recording track is provided. In this method, the record marks are formed such that: M w / T w > 1 when T W is width of the recording track, and M L is width of the record mark.
Inventors
- 👤 Takashi Kikukawa
- 👤 Hajime Utsunomiya
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 19:16
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24085; G11B7/004; G11B7/0045; G11B7/00454
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
A method for recording an optical recording medium
having a substrate having grooves formed thereon and a
recording layer of phase change type on the substrate
wherein a groove or a land between two adjacent grooves is
used for the recording track, and wherein the record marks
are formed such that: M w / T w > 1 when T W is width of the recording track, and M w is width of
the record mark.
Claim 2
Dependent Claim
33 words
The optical recording method according to claim 1
wherein the record marks are formed such that: M w / M L ≥ 1 when M L is length of the shortest record mark.
Claim 3
Dependent Claim
50 words
The optical recording method according to claim 1 or
2 wherein the groove has a depth Gd such that: G d < λ / 8n when G d is depth of the groove, n is refractive index of
the substrate, and λ is wavelength of the recording or
reproducing beam.
Claim 4
Dependent Claim
30 words
The optical recording method according to any one of
claims 1 to 3 wherein, in said optical recording medium,
the record marks are amorphous and the non-recorded area is
crystalline.
References Cited (Backward Citations)
US5553051A
Cited
JPH03183024A
Cited
US5204852A
Cited
US5493561A
Cited
JPH0981967A
Cited
EP0871162A2
Cited
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