Patent US3838889A successfully refreshed from Google Patents.
Patent US3702993A successfully refreshed from Google Patents.
US3702993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storage device
Assignee: US Philips Corp
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Filing: 1970-12-09
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Granted: 1972-11-14
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Expires: 1990-12-09
Abstract
Abstract In stores using a thin magnetic film the coercivity of which is highly temperature-dependent, in order to write an information an area is heated by an electron beam or a laser beam to a temperature such (for example, a temperature above the Curietemperature) as to enable the magnetisation in the relavant area to be adjusted to an externally generated magnetic field. This magnetic field is not generated in known manner by a coil at the edge of the store, but by a printed wire which traces a tortuous path between the discrete areas. Owing to the small distance between the printed wire and each storage area a smaller magnetic field is required and the inductance of this printed wire is lower than that of a coil arranged at the edge, permitting the magnetic field to be switched considerably more readily and rapidly for writing. The use of a beam splitter permits the production of a word-organized store of large capacity.
Inventors
- 👤 Hans Wilhelm Neuhaus
- 👤 Jan Verweel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:52
CPC Classifications
G; G11; G11C; G11C17/00; G11C17/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
142 words
A storage device for storing binary information in the form of magnetic states comprising a magnetizable material having a coercivity which is variable over a large range within a comparatively small temperature range, said material deposited on a substrate in the form of a plurality of separately spared areas of a thin film, said areas being maintained at a temperature below the said temperature range, means for selectively storing binary-coded information in any single area of said film by heating said area with a controllable beam of energy to a temperature above the said temperature range whereby the magnetization of said heated area is adjusted in the direction of an externally applied magnetic field, said dIrection being controlled by the binary-coded information, and a printed wire deposited so as to trace a tortuous path between said areas for providing said magnetic field.
Claim 2
Dependent Claim
142 words
A storage device for storing binary information in the form of magnetic states comprising a magnetizable material having a coercivity which is variable over a large range within a comparatively small temperature range, said material deposited on a substrate in the form of a plurality of separately spared areas of a thin film, said areas being maintained at a temperature below the said temperature range, means for selectively storing binary-coded information in any single area of said film by heating said area with a controllable beam of energy to a temperature above the said temperature range whereby the magnetization of said heated area is adjusted in the direction of an externally applied magnetic field, said dIrection being controlled by the binary-coded information, and a printed wire deposited so as to trace a tortuous path between said areas for providing said magnetic field.
Claim 3
Dependent Claim
17 words
A storage device as claimed in claim 1, wherein said printed wire is divided into several parts.
Claim 4
Dependent Claim
98 words
A storage device as claimed in claim 1, wherein each of said areas are divided into several groups, each including the same number of equally arranged areas, an energy beam arranged to pass through a control means, a beam splitter, said beam splitter dividing said controlled energy beam into a number of energy sub-beams of about equal intensities, which number is equal to the number of said groups, the emergent energy sub-beams being spaced from one another by constant distances which correspond to the distances between said groups at various points of impact of the incident energy beam.
Claim 5
Dependent Claim
25 words
A storage device as claimed in claim 3, wherein a given bit of an information word is stored in the same area of each group.
Claim 6
Dependent Claim
16 words
A storage device as claimed in claim 1 wherein said energy beam is a laser beam.
Claim 7
Dependent Claim
19 words
A storage device as claimed in claim 6, wherein said laser beam is controlled by a digital light deflector.
Claim 8
Dependent Claim
43 words
A storage device as claimed in claim 1 further including a positionable beam of polarized electromagnetic waves of lower intensity for reading or writing information, said information being contained in the rotation of the plane of polarization of the transmitted or reflected beam.
Claim 9
Dependent Claim
19 words
A storage device as claimed in claim 7, wherein one optical detector is provided for all the discrete areas.
Claim 10
Dependent Claim
130 words
A storage device for storing binary information in the form of magnetic states comprising a magnetizable material forming storage elements having a coercivity which is variable over a large range within a comparatively small temperature range, said material deposited on a substrate, said elements being maintained at a temperature below the said temperature range, means for selectively storing binary-coded information in any single element by heating said area with a controllable beam of energy to a temperature above the said temperature range whereby the magnetization of said heated element is adjusted in the direction of an externally applied magnetic field, said direction being controlled by the binary-coded information, and a printed wire tracing a tortuous path, portions of which are enclosed within said storage elements for providing said magnetic field.
Claim 11
Dependent Claim
130 words
A storage device for storing binary information in the form of magnetic states comprising a magnetizable material forming storage elements having a coercivity which is variable over a large range within a comparatively small temperature range, said material deposited on a substrate, said elements being maintained at a temperature below the said temperature range, means for selectively storing binary-coded information in any single element by heating said area with a controllable beam of energy to a temperature above the said temperature range whereby the magnetization of said heated element is adjusted in the direction of an externally applied magnetic field, said direction being controlled by the binary-coded information, and a printed wire tracing a tortuous path, portions of which are enclosed within said storage elements for providing said magnetic field.
Claim 12
Dependent Claim
31 words
A storage device as claimed in claim 9, wherein said substrate, at least in the proximity of said storage elements, consist of a soft magnetic material forming part of said enclosure.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |