US5504734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical disc
Assignee: Research Investment Network Inc
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Filing: 1994-05-27
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Granted: 1996-04-02
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Expires: 2014-05-27
Abstract
Abstract An optical disc is formed with a land and a groove, and information is recorded on one of the land and the groove. Track pitch P and the width W of the other of the land and the groove satisfy the following conditions: when P>1.2 μm, W≦0.217P; when P≦1.2 μm, W≦0.278P.
Inventors
- 👤 Seiji Morita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:38
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24073; G11B7/24079
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
56 words
In an optical disc having a plurality of tracks defined by lands and grooves, and wherein information is recorded on one of said lands and said grooves, the improvement characterized in that track pitch P and the width W of the other of said lands and said grooves satisfy the following conditions: P≦1.2 μm and W≦0.278P.
Claim 2
Dependent Claim
56 words
In an optical disc having a plurality of tracks defined by lands and grooves, and wherein information is recorded on one of said lands and said grooves, the improvement characterized in that track pitch P and the width W of the other of said lands and said grooves satisfy the following conditions: P≦1.2 μm and W≦0.278P.
Claim 3
Dependent Claim
13 words
An optical disc according to claim 1, further satisfying the following condition: 0.143P≦W.
Claim 4
Dependent Claim
47 words
In an optical disc of the land recording type having a plurality of tracks defined by lands and grooves, and wherein information is recorded on said lands, the improvement characterized in that track pitch P and groove width W satisfy the following conditions: P≦1.2 μm and W≦0.278P.
Claim 5
Dependent Claim
47 words
In an optical disc of the land recording type having a plurality of tracks defined by lands and grooves, and wherein information is recorded on said lands, the improvement characterized in that track pitch P and groove width W satisfy the following conditions: P≦1.2 μm and W≦0.278P.
Claim 6
Dependent Claim
23 words
An optical disc according to claim 3, wherein the track pitch P and the groove width W further satisfy the following condition: 0.143P≦W.
Claim 7
Dependent Claim
14 words
An optical disc according to claim 3, wherein the groove width is 0.3 μm.
Claim 8
Dependent Claim
47 words
In an optical disc of the groove recording type having a plurality of tracks defined by lands and grooves, and wherein information is recorded on said grooves, the improvement characterized in that track pitch P and land width W satisfy the following conditions: P≦1.2 μm and W≦0.278P.
Claim 9
Dependent Claim
47 words
In an optical disc of the groove recording type having a plurality of tracks defined by lands and grooves, and wherein information is recorded on said grooves, the improvement characterized in that track pitch P and land width W satisfy the following conditions: P≦1.2 μm and W≦0.278P.
Claim 10
Dependent Claim
23 words
An optical disc according to claim 6, wherein the track pitch P and the land width W further satisfy the following condition: 0.143P≦W.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-02 | 1999-10-02 | 2000-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-02 | 2003-10-02 | 2004-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-02 | 2007-10-02 | 2008-04-02 | $7700.00 | Window Closed / Lapsed |