EP0919996A2
Expired / Lapsed
EP
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Phase change optical disk having a reflection layer of noble metal, and optical data storage system therefor
Assignee: Samsung Electronics Co Ltd
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Filing: 1998-11-25
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Granted: —
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Expires: 2018-11-25
Abstract
Abstract A high-density phase change optical disk used as DVD-RAM, includes a reflection layer made of a noble metal which have characteristics of high thermal conductivity, high reflectivity and high melting temperature, such as copper (Cu), silver (Ag) or gold (Au). Accordingly, the phase change optical disk according to the present invention largely increases the number of times of overwriting, compared with the phase change optical disk having a reflection layer made of aluminum (Al). Also, the cross-erasing phenomenon that when writing information on a target track, information recorded on a track adjacent to the target track is deleted, is remarkably reduced.
Inventors
- 👤 Seong-Sue Kim
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 03:59
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10586; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/258; G11B7/259; G11B11/10584; G11B20/00; G11B20/10; G11B20/10009; G11B20/10305; G11B20/10398; G11B7/004; G11B7/0045; G11B7/00454; G11B7/242; G11B7/243; G11B7/257; G11B2007/24302; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B2007/2582; G11B2007/2583; G11B2220/00; G11B2220/20; G11B2220/25; G11B2220/2537; G11B2220/2562; G11B2220/2575; G11B7/006; G11B7/007; G11B7/00718; G11B7/12; G11B7/125; G11B7/253; G11B7/2533; G11B7/2534; G11B7/2595
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
61 words
An optical disk comprising. a substrate; and at least a film applied on a side surface of the substrate and including, a recording layer applied over the substrate; a dielectric layer applied on the recording layer and having a
thichkenss larger than 100Å and smaller than 350Å; and a reflection layer applied on the dielectric layer and made of a
metal.
Claim 2
Dependent Claim
24 words
The optical disk according to claim 1, wherein the reflection layer
is made of one selected from copper (Cu), gold (Au) and silver (Ag).
Claim 3
Dependent Claim
16 words
The optical disk according to claim 1, wherein the reflection layer
is preferably made of Au.
Claim 4
Dependent Claim
17 words
The optical disk according to claim 1, wherein the optical disk is a
phase change optical disk.
Claim 5
Dependent Claim
37 words
The optical disk according to claim 1, wherein the dielectric layer
is made of ZnS (of 80 at. %)-SiO 2 (20 at. %), and the recording layer is
made of Ge 2 Sb 2 Te 5 .
Claim 6
Dependent Claim
26 words
The optical disk according to claim 1, wherein a track pitch in the
phase change optical disk is less than or equal to about 0.6 µm.
Claim 7
Dependent Claim
35 words
The optical disk according to claim 1, wherein a light beam having
a wavelength less than or equal to about 690nm is used for writing, erasing or reading information
on the phase change optical disk.
Claim 8
Dependent Claim
74 words
A phase change optical disk comprising: a substrate; and at least a film applied on a side surface of the substrate and including a first dielectric layer applied on the substrate; a recording layer applied on the first dielectric layer; a second dielectric layer applied on the recording layer and having
a thickness larger than 100Å and smaller than 350Å; and a reflection layer applied on the dielectric layer and made of a
metal.
Claim 9
Dependent Claim
26 words
The phase change optical disk according to claim 8, wherein the
reflection layer is made of one selected from copper (Cu), gold (Au) and
silver (Ag).
Claim 10
Dependent Claim
28 words
The phase change optical disk according to claim 8, wherein a
track pitch in the phase change optical disk is less than or equal to about
0.6 µm.
Claim 11
Dependent Claim
32 words
The phase change optical disk according to claim 8, wherein a
light beam having a wavelength of 690nm is used for writing, erasing or
reading information on the phase change optical disk.
Claim 12
Dependent Claim
102 words
An optical data storage system comprising: an optical disk including a substrate, and at least a film applied on a
side surface of the substrate and having a recording layer applied over the
substrate, a dielectric layer applied on the recording layer and having a
thickness larger than 100Å and smaller than 350Å, and a reflection layer
applied on the dielectric layer and made of a metal; and an optical disk drive for using a laser power of 10 ∼ 12mW during
writing on the optical disk and for using a laser power of about 1mW
during reading from the optical disk.
Claim 13
Dependent Claim
26 words
The optical data storage system according to claim 12, wherein
the reflection layer is made of one selected from copper (Cu), gold (Au) and
silver (Ag).
Claim 14
Dependent Claim
21 words
The optical data storage system according to claim 13, wherein
the optical data storage system is a phase change optical disk.
Claim 15
Dependent Claim
39 words
The optical data storage system according to claim 14, wherein
the dielectric layer is made of ZnS (of 80 at. %)-SiO 2 (20 at. %), and the
recording layer is made of Ge 2 Sb 2 Te 5 .
Claim 16
Dependent Claim
28 words
The optical data storage system according to claim 15, wherein a
track pitch in the phase change optical disk is less than or equal to about
0.6 µm.
Claim 17
Dependent Claim
37 words
The optical data storage system according to claim 13, wherein a
light beam having a wavelength less than or equal to about 690nm is used for writing, erasing or
reading information on the phase change optical disk.
Claim 18
Dependent Claim
17 words
The optical data storage system according to claim 12, wherein
the optical disk is a magneto-optical disk.
References Cited (Backward Citations)
EP0630007A1
Cited
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