US3624622A
Expired / Lapsed
US
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Optical information storage system
Assignee: Honeywell Inc
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Filing: 1969-08-15
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Granted: 1971-11-30
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Expires: 1989-08-15
Abstract
Abstract An information storage system in which bits of information are stored on quenched high-temperature phase magnetic film by utilizing a laser to heat the film above it''s high-temperature phase Curie point. The laser beam is attenuated to provide nondestructive readout utilizing either the magneto-optic Kerr or Faraday effects.
Inventors
- 👤 Di Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:48
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10532; G11B11/10534; G11B11/10536; G03; G03G; G03G5/00; G03G5/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
83 words
A system for storing information on magnetic film, comprising: a quenched-phase magnetic film for storing bits of information on predetermined portions thereof, an energy source for providing energy to heat a predetermined portion of the film to a temperature above the Curie temperature associated with the quenched-phase film, thereby causing a change in the magnetization direction of the predetermined portion upon cooling of the portion below the quenched-phase Curie temperature, and means for directing the energy to the predetermined portion of the film.
Claim 2
Independent Claim
83 words
A system for storing information on magnetic film, comprising: a quenched-phase magnetic film for storing bits of information on predetermined portions thereof, an energy source for providing energy to heat a predetermined portion of the film to a temperature above the Curie temperature associated with the quenched-phase film, thereby causing a change in the magnetization direction of the predetermined portion upon cooling of the portion below the quenched-phase Curie temperature, and means for directing the energy to the predetermined portion of the film.
Claim 3
Dependent Claim
18 words
The information storage system as defined in claim 1 wherein the energy source is an electromagnetic energy source.
Claim 4
Dependent Claim
17 words
The information system as defined in claim 1 wherein the energy source is an electron beam source.
Claim 5
Dependent Claim
16 words
The information storage system as defined in claim 1 wherein The magnetic material is manganese bismuth.
Claim 6
Dependent Claim
17 words
The information storage system as defined in claim 2 wherein the electromagnetic energy source is a laser.
Claim 7
Dependent Claim
38 words
The information storage system as defined in claim 2 including means for selectively attenuating the electromagnetic energy to an intensity level insufficient to heat the magnetic film about the quenched-phase Curie temperature so that nondestructive readout is obtained.
Claim 8
Dependent Claim
46 words
The information storage system as defined in claim 6 including means for analyzing the attenuated electromagnetic energy after it is incident a selected portion of the magnetic film, the intensity of the electromagnetic energy transmitted by the analyzer being dependent upon the selected portion''s magnetization direction.
Claim 9
Dependent Claim
34 words
The information storage system as defined in claim 7 wherein the electromagnetic energy source is a laser, the magnetic material is manganese bismuth, and the energy directing means is an electro-optic light beam deflector.
References Cited (Backward Citations)
US3189493A
Cited
US3368209A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |