Patent US3824570A successfully refreshed from Google Patents.
US3824570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magneto-optical transducer using bubble domains
Assignee: US Philips Corp
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Filing: 1973-03-12
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Granted: 1974-07-16
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Expires: 1993-03-12
Abstract
Abstract A device for converting image information into magnetic information including a light source for projecting an image of the image information onto a plate of magnetic material capable of accommodating domains. A domain pattern is produced by the projection of the image information, as a result of the thermal action of the incident light, which is an image of the image information. Domain displacement means are provided by means of which the domain pattern thus obtained can be displaced, at least in parts, for reading purposes.
Inventors
- 👤 Bot L De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:15
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/024; H04N1/028; H04N1/21; H04N1/2104; H04N1/2108
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
70 words
A device for converting image information into magnetic information. comprising a light source for projecting an image of the image information onto a plate of magnetic material which is suitable to accommodate domains to produce therein a domain pattern by the thermal action of the incident light corresponding to said image of the image information, and means for displacing domains to thereby read said image information stored in said plate.
Claim 2
Independent Claim
70 words
A device for converting image information into magnetic information. comprising a light source for projecting an image of the image information onto a plate of magnetic material which is suitable to accommodate domains to produce therein a domain pattern by the thermal action of the incident light corresponding to said image of the image information, and means for displacing domains to thereby read said image information stored in said plate.
Claim 3
Dependent Claim
35 words
A device as claimed in claim 1, wherein said magnetic material has a compensation temperature to which the local heating by the light incident on the plate takes place whereby the domains are locally generated.
Claim 4
Dependent Claim
44 words
A device as claimed in claim 2 further including means for filling the plate of magnetic material with domains, the local heating by the incident light taking place in the vicinity of the Curie temperature of the magnetic material whereby the domains locally disappear.
Claim 5
Dependent Claim
71 words
A device as claimed in claim 1, wherein the domain displacement means consist of a second plate of magnetic material which contains domains and in which domain paths are provided along which the domains in the second plate can be displaced, interaction between the domains in the second plate and the domains of the domain pattern in the said plate enabling displacement of the domains in said plate for reading purposes.
Claim 6
Dependent Claim
47 words
A device as claimed in claim 1 including means for returning the pattern information from the outputs of the said plate to the inputs thereof whereby a circulating domain pattern is obtained which is an image of the image information in the said plate of magnetic materials.
References Cited (Backward Citations)
US3787825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |