Patent US5179547A successfully refreshed from Google Patents.
US5179547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase change optical information recording medium including means for preventing movement of the recorded portion
Assignee: Pioneer Corp
•
Filing: 1991-05-28
•
Granted: 1993-01-12
•
Expires: 2011-05-28
Abstract
Abstract On the phase change optical information recording medium, a plurality of protection pits each smaller than one pit on the pre-pit region are provided over the entire data region of the recording film at least on its surface. Therefore, even when overwriting is repeatedly performed, the reproduced data waveform is distorted less frequently and data error is reduced. By forming the group of protection pits, the adhesive strength between the phase change recording film and the protective film can be increased, and the reliability of exfoliating strength can be improved.
Inventors
- 👤 Toshihiro Komaki
- 👤 Hideo Kudo
- 👤 Tomonori Ishizuki
- 👤 Ryoichi Hirota
- 👤 Masahiro Katsumura
- 👤 Seishi Maita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:42
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24085; G11B7/26
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
63 words
A phase change optical information recording medium, comprising: a transparent substrate; and a phase change type recording film supported by the transparent substrate and having a track defined on a surface thereof, said recording film comprising: a data region defined along the track for storing recorded information, and movement prevention means provided in the data region for preventing movement of the recorded information.
Claim 2
Dependent Claim
63 words
A phase change optical information recording medium, comprising: a transparent substrate; and a phase change type recording film supported by the transparent substrate and having a track defined on a surface thereof, said recording film comprising: a data region defined along the track for storing recorded information, and movement prevention means provided in the data region for preventing movement of the recorded information.
Claim 3
Dependent Claim
27 words
A phase change optical information recording medium as claimed in claim 1, wherein said movement prevention means are formed only along the track of the recording film.
Claim 4
Dependent Claim
26 words
A phase change optical information recording medium as claimed in claim 1, wherein said movement prevention means are distributed over the surface of the recording film.
Claim 5
Dependent Claim
23 words
A phase change optical information recording medium as claimed in claim 1, wherein said movement prevention means comprises a plurality of protection pits.
Claim 6
Dependent Claim
18 words
A phase change optical information recording medium as claimed in claim 4, wherein said protection pits are oval-shaped.
Claim 7
Dependent Claim
18 words
A phase change optical information recording medium as claimed in claim 4, wherein said protection pits are circular.
Claim 8
Dependent Claim
27 words
A phase change optical information recording medium as claimed in claim 4, wherein said movement prevention means are formed only along the track of the recording film.
Claim 9
Dependent Claim
26 words
A phase change optical information recording medium as claimed in claim 4, wherein said movement prevention means are distributed over the surface of the recording film.
Claim 10
Dependent Claim
48 words
A phase change optical information recording medium as claimed in claim 4, wherein the depth of each of said protection pits is no more than λ/(4n) or less wherein λ represents the wavelength of an irradiated light beam and (n) represents the refractive index of the transparent substrate.
Claim 11
Dependent Claim
31 words
A phase change optical information recording medium as claimed in claim 1, wherein said movement prevention means comprises a plurality of irregular recesses distributed over the surface of the recording film.
Claim 12
Dependent Claim
82 words
A phase change optical information recording medium, comprising: a transparent substrate; and a phase change type recording film supported by the transparent substrate and having a track defined on a surface thereof, said recording film comprising: a plurality of pre-pit regions formed along the track each comprising at least one pre-pit, a data region defined along the track between adjacent pre-pit regions for storing recorded information, and movement prevention means provided in the data region for preventing movement of the recorded information.
Claim 13
Dependent Claim
82 words
A phase change optical information recording medium, comprising: a transparent substrate; and a phase change type recording film supported by the transparent substrate and having a track defined on a surface thereof, said recording film comprising: a plurality of pre-pit regions formed along the track each comprising at least one pre-pit, a data region defined along the track between adjacent pre-pit regions for storing recorded information, and movement prevention means provided in the data region for preventing movement of the recorded information.
Claim 14
Dependent Claim
23 words
A phase change optical information recording medium as claimed in claim 11, wherein said movement prevention means comprises a plurality of protection pits.
Claim 15
Dependent Claim
32 words
A phase change optical information recording medium as claimed in claim 12, wherein the area of each of said protection pits is smaller than the area of said at least one pre-pit.
Claim 16
Dependent Claim
45 words
A phase change optical information recording medium as claimed in claim 12, wherein said at least one pre-pit and said protection pits are circular, and wherein the diameter of each of said protection pits is smaller than the diameter of said at least one pre-pit.
Claim 17
Dependent Claim
48 words
A phase change optical information recording medium as claimed in claim 12, wherein the depth of each of said protection pits is no more than λ/(4n) or less wherein λ represents the wavelength of an irradiated light beam and (n) represents the refractive index of the transparent substrate.
Claim 18
Dependent Claim
27 words
A phase change optical information recording medium as claimed in claim 11, wherein said movement prevention means are formed only along the tack of the recording film.
Claim 19
Dependent Claim
26 words
A phase change optical information recording medium as claimed in claim 11, wherein said movement prevention means are distributed over the surface of the recording film.
References Cited (Backward Citations)
US4761775A
Cited
JPS58100247A
Cited
EP0164131A2
Cited
US4949331A
Cited
US4910725A
Cited
JPS63148420A
Cited
JPS63161546A
Cited
US4991163A
Cited
EP0329425A2
Cited
JPH0287343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-01-12 | 1996-07-13 | 1997-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-01-12 | 2000-07-13 | 2001-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-01-12 | 2004-07-13 | 2005-01-12 | $7700.00 | Window Closed / Lapsed |