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EP0097035A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Optical disk scanning system

Assignee: Xerox Corp
•
Filing: 1983-06-09
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Granted: —
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Expires: 2003-06-09
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Abstract

Abstract An optical disk system having direct read after write capabilities in which the write beam and the read beam are generated by a pair of integrated injection diode lasers. The integration can be achieved by mounting two separate injection diode lasers side by side in a common package or providing two side by side injection diode lasers formed on a common semiconductor substrate. The two lasers would be located in the same focal plane relative to a recording material, with one of the lasers pulse modulated to provide a data modulated write beam and the other laser driven in the continuous wave (CW) regime to provide a read beam of constant intensity. The plane containing the focused beams would be oriented relative to the recording material so that the focused beams impinge upon adjacent portions on one data track of the recording material. Since the pair of lasers are closely spaced (1-1000 microns) a common optical path or train is used for both the write beam and the read beam.

Inventors

  • 👤 Robert A. Sprague

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-03 13:20
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/125; G11B7/127; G11B11/00; G11B11/10; G11B11/105; G11B11/10502; G11B11/10504; G11B11/10515; G11B11/10532

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 94 words
An optical disk scanning system with direct read after write capabilities comprising: a light level sensitive recording material capable of recording data along at least one data track position; first means for moving said recording material; a pair of integrated solid state lasers; drive means for said lasers for providing an information modulated light beam and an unmodulated light beam; second means for transmitting said beams to said recording material along said data track position; and third means for detecting changes in a physical property of the unmodulated beam reflected from said recording material.
Claim 2
Dependent Claim 94 words
An optical disk scanning system with direct read after write capabilities comprising: a light level sensitive recording material capable of recording data along at least one data track position; first means for moving said recording material; a pair of integrated solid state lasers; drive means for said lasers for providing an information modulated light beam and an unmodulated light beam; second means for transmitting said beams to said recording material along said data track position; and third means for detecting changes in a physical property of the unmodulated beam reflected from said recording material.
Claim 3
Dependent Claim 20 words
A system as claimed in claim 1, in which the pair of lasers is formed on a common semiconductor substrate.
Claim 4
Dependent Claim 86 words
A system as claimed in claim 1 or 2, in which the laser drive means supplies a variable magnitude drive signal to one laser to provide a modulated write beam, and a substantially constant drive signal to the other to provide an unmodulated read beam, and in which said beams are transmitted to said recording material such that said read beam illuminates said data track behind the portion of said data track illuminated by said write beam in the direction of movement of said recording material.

References Cited (Backward Citations)

US3431513A Cited
US4051528A Cited
DE2918931A1 Cited
EP0061220A1 Cited
JPS57158044A Cited

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