US4122551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical data storage and retrieval system
Assignee: Xerox Corp
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Filing: 1977-04-08
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Granted: 1978-10-24
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Expires: 1997-04-08
Abstract
Abstract An optical data storage and display system which utilizes the recorded pattern on an optical disk to modulate directly the output or writing light beam incident thereon, thereby eliminating the light modulator of conventional output scanner systems. The optical disk is fixed coaxially to the same motor drive shaft as a rotating multi-faceted output scanner such that each facet of the scanner automatically corresponds geometrically to a data sector of the optical disk, thereby eliminating the need for servo synchronization between the optical disk and the scanner and the large data buffering that such servo synchronization necessitates.
Inventors
- 👤 John C. Urbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:36
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/28
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
188 words
An optical data storage and retrieval system comprising: a photosensitive surface; an optical data storage disk having at least one data storage track divided into a plurality of data sectors, said data sectors being characterized by areas of different optical characteristics; an optical scanner having a plurality of reflective surfaces; said optical storage disk and said optical scanner being mounted on a common rotatable shaft, said optical storage disk and said optical scanner being mounted on said shaft such that at least some of said track sectors correspond geometrically with at least some of said reflective surfaces; means for providing a light beam of high intensity; means for projecting said light beam to a focused spot on said areas of a selected one of said data sectors whereby said light beam is amplitude modulated directly in accordance with the different optical characteristics of said areas; and means for projecting said amplitude modulated light beam onto the reflective surface of said scanner having a geometric correspondence to said selected one of said data sectors to thereby provide for scanning of said amplitude modulated light beam across said photosensitive surface.
Claim 2
Dependent Claim
188 words
An optical data storage and retrieval system comprising: a photosensitive surface; an optical data storage disk having at least one data storage track divided into a plurality of data sectors, said data sectors being characterized by areas of different optical characteristics; an optical scanner having a plurality of reflective surfaces; said optical storage disk and said optical scanner being mounted on a common rotatable shaft, said optical storage disk and said optical scanner being mounted on said shaft such that at least some of said track sectors correspond geometrically with at least some of said reflective surfaces; means for providing a light beam of high intensity; means for projecting said light beam to a focused spot on said areas of a selected one of said data sectors whereby said light beam is amplitude modulated directly in accordance with the different optical characteristics of said areas; and means for projecting said amplitude modulated light beam onto the reflective surface of said scanner having a geometric correspondence to said selected one of said data sectors to thereby provide for scanning of said amplitude modulated light beam across said photosensitive surface.
Claim 3
Dependent Claim
26 words
The system of claim 1 wherein an optical delay line is interposed between said means for projecting said amplitude modulated light beam and said photosensitive surface.
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) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |