Patent US5138598A successfully refreshed from Google Patents.
US5138598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical disk having relatively wide ram tracks and relatively narrow rom tracks
Assignee: Sony Corp
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Filing: 1991-01-22
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Granted: 1992-08-11
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Expires: 2011-01-22
Abstract
Abstract A record medium having a pre-formed recording track with a recordable area on the recording track in which data is recorded and an area on the recording track used exclusively for reproduction in which data is pre-recorded by displacing the track in the track width direction and in which the track width of the data recordable area is wider than that of the area used exclusively for reproduction, so that crosstalk is minimized and the carrier-to-noise ratio and error rate when reproducing recorded data are improved.
Inventors
- 👤 Yoichiro Sako
- 👤 Tamotsu Yamagami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:33
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24073; G11B7/24082; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B7/002; G11B7/0033; G11B7/007; G11B7/0079; G11B7/24079; G11B2220/00; G11B2220/20; G11B2220/21; G11B2220/211
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
An optical record medium from which recorded data is read out by an optical means, comprising: a recording track pre-formed on said optical record medium; a recordable area formed on said recorded track and in which data is recorded along a track direction; and an area used exclusively for reproduction in which data is pre-recorded by displacing the recording track in the track width direction in response to data, wherein said data recordable area has a track width greater than that of said area used exclusively for reproduction.
Claim 2
Dependent Claim
88 words
An optical record medium from which recorded data is read out by an optical means, comprising: a recording track pre-formed on said optical record medium; a recordable area formed on said recorded track and in which data is recorded along a track direction; and an area used exclusively for reproduction in which data is pre-recorded by displacing the recording track in the track width direction in response to data, wherein said data recordable area has a track width greater than that of said area used exclusively for reproduction.
Claim 3
Dependent Claim
40 words
An optical record medium according to claim 1, in which a frequency of said data recorded by displacing said track in the track width direction is sufficiently higher than that of a tracking error signal obtained by scanning said track.
Claim 4
Dependent Claim
18 words
An optical record medium according to claim 2, in which said optical record medium is a magneto-optical disk.
Claim 5
Dependent Claim
18 words
An optical record medium according to claim 2, in which said optical record medium is an optical card.
Claim 6
Dependent Claim
115 words
An optical record medium from which recorded data is read out by an optical means, comprising: a recording track pre-formed on said optical record medium; a recordable area formed on said recording track and in which data is recorded along a track direction; and a control information area formed on said recording track in which control information is pre-recorded, said recordable area and said control information area being formed alternately along said recording track, in which said control information is formed by displacing said recording track in the track width direction based on said control information and a track width of said recordable area is wider than a track width of said control information area.
Claim 7
Dependent Claim
115 words
An optical record medium from which recorded data is read out by an optical means, comprising: a recording track pre-formed on said optical record medium; a recordable area formed on said recording track and in which data is recorded along a track direction; and a control information area formed on said recording track in which control information is pre-recorded, said recordable area and said control information area being formed alternately along said recording track, in which said control information is formed by displacing said recording track in the track width direction based on said control information and a track width of said recordable area is wider than a track width of said control information area.
Claim 8
Dependent Claim
40 words
An optical record medium according to claim 5, in which a frequency of said data recorded by displacing said track in said track width direction is sufficiently higher than that of a tracking error signal obtained by scanning said track.
Claim 9
Dependent Claim
35 words
An optical record medium according to claim 6, in which said recording track is displaced in the track width direction to record, as a part of said control information, a synchronizing signal of said data.
Claim 10
Dependent Claim
31 words
An optical record medium according to claim 6, in which said recording track is displaced in the track width direction to record address information as a part of said control information.
Claim 11
Dependent Claim
18 words
An optical record medium according to claim 6, in which said optical record medium is a magneto-optical disk.
References Cited (Backward Citations)
US4744074A
Cited
US4893298A
Cited
US4910725A
Cited
JPS63200319A
Cited
US4947384A
Cited
JPH01296443A
Cited
EP0419239A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |