US4760565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed track access for optical disks using acousto-optic deflector
Assignee: International Business Machines Corp
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Filing: 1986-09-15
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Granted: 1988-07-26
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Expires: 2006-09-15
Abstract
Abstract A process for accessing disk tracks in an optical storage disk using a laser beam passed through an acousto-optic deflector which generates an undeflected beam and at least one deflected beam both of which are focussed on the surface of the disk. The deflected beam is used to read or write data and the undeflected beam is used to follow a servoing structure on the disk.
Inventors
- 👤 Victor B. Jipson
- 👤 Daniel Rugar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:25
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/1055; G11B11/10556; G11B11/10502; G11B11/10576; G11B7/00; G11B7/08; G11B7/085; G11B7/08547; G11B7/09
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
82 words
A process for accessing disk tracks in an optical storage disk, said process being characterized by the steps of: (1) passing a laser beam through an acousto-optic deflector which generates an undeflected beam and at least one deflected beam; (2) focusing the undeflected beam and at least one deflected beam onto the surface of the disk; (3) using at least one deflected beam to write or read data and; (4) using the undeflected beam to follow a servoing structure on the disk.
Claim 2
Dependent Claim
82 words
A process for accessing disk tracks in an optical storage disk, said process being characterized by the steps of: (1) passing a laser beam through an acousto-optic deflector which generates an undeflected beam and at least one deflected beam; (2) focusing the undeflected beam and at least one deflected beam onto the surface of the disk; (3) using at least one deflected beam to write or read data and; (4) using the undeflected beam to follow a servoing structure on the disk.
Claim 3
Dependent Claim
14 words
A process as claimed in claim 1 wherein there is a single deflected beam.
Claim 4
Dependent Claim
15 words
A process as claimed in claim 1 in which the deflected beam angle is variable.
Claim 5
Dependent Claim
20 words
A process as claimed in claim 1 wherein the servoing structure comprises reference grooves separated by ungrooved data recording areas.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |