US3761645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and process for thermomagnetically replicating magnetic recordings using a scanning beam of radiant energy
Assignee: RCA Corp
•
Filing: 1972-03-31
•
Granted: 1973-09-25
•
Expires: 1992-03-31
Abstract
Abstract In a process and apparatus for replicating a prerecorded magnetic tape, the particle-binder layer of the prerecorded tape is brought into slippage-free intimate contact with the particlebinder layer of the copy tape. As the tapes are moved in a first direction a laser beam impinges upon the particle-binder layer of the copy tape with a spot size of the same order of magnitude as the particles of the particle-binder layer of the copy tape. The laser beam is deflected to traverse a scanning pattern on the particle-binder layer of the copy tape transverse to the movement of the tape to provide rapid localized heating of the copy tape magnetizable particles to a temperature above its Curie point.
Inventors
- 👤 A Stancel
- 👤 W Isom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:50
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/86; G11B5/865; G03; G03G; G03G19/00
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
130 words
An apparatus comprising: a prerecorded magnetizable medium and an unrecorded magnetizable medium each having a particle-binder layer; means for positioning at least a portion of the particle-binder layer of said prerecorded magnetizable medium in intimate contact with the particle-binder layer of said unrecorded magnetizable medium; means for generating a beam of energy directed to impinge upon the particle-binder layer of said unrecorded magnetizable medium to heat the particles of said medium to its Curie point, said beam impinging upon the particle-binder layer with a spot size of the same order of magnitude as the largest dimension of the particles of the particle-binder layer of said unrecorded magnetizable medium; and means for deflecting said beam of energy to traverse a scanning pattern on the particle-binder layer of said unrecorded magnetizable medium.
Claim 2
Independent Claim
130 words
An apparatus comprising: a prerecorded magnetizable medium and an unrecorded magnetizable medium each having a particle-binder layer; means for positioning at least a portion of the particle-binder layer of said prerecorded magnetizable medium in intimate contact with the particle-binder layer of said unrecorded magnetizable medium; means for generating a beam of energy directed to impinge upon the particle-binder layer of said unrecorded magnetizable medium to heat the particles of said medium to its Curie point, said beam impinging upon the particle-binder layer with a spot size of the same order of magnitude as the largest dimension of the particles of the particle-binder layer of said unrecorded magnetizable medium; and means for deflecting said beam of energy to traverse a scanning pattern on the particle-binder layer of said unrecorded magnetizable medium.
Claim 3
Dependent Claim
19 words
An apparatus as defined in claim 1 wherein said beam of energy is a beam of coherent radiant energy.
Claim 4
Dependent Claim
42 words
An apparatus as defined in claim 2 wherein said positioning means positions said prerecorded and said unrecorded magnetizable mediums in slippage free contact and moves said mediums in a direction transverse to the scanning pattern of said beam of coherent radiant energy.
Claim 5
Dependent Claim
29 words
An apparatus as defined in claim 3 wherein said beam of coherent radiant energy is focused to a point located within the particle-binder layer of said unrecorded magnetizable medium.
Claim 6
Dependent Claim
25 words
An apparatus as defined in claim 2 wherein the particle-binder layer of said unrecorded magnetizable medium is supported on a clear radiant energy transmissive material.
Claim 7
Dependent Claim
35 words
An apparatus as defined in claim 5 wherein the particle-binder layer of said unrecorded magnetizable medium is dark in color to facilitate heat absorption within the particle-binder layer of the radiant energy of said beAm.
Claim 8
Independent Claim
145 words
An apparatus comprising: a prerecorded magnetizable medium and an unrecorded magnetizable medium each having a particle-binder layer; means for positioning at least a portion of the particle-binder layer of said prerecorded magnetizable medium in slippage free intimate contact with the particle-binder layer of said unrecorded magnetizable medium and moving said prerecorded and unrecorded magnetizable mediums in a first direction; a laser for generating a beam of coherent radiant energy which is directed to impinge upon the particle-binder layer of said unrecorded magnetizable medium with an impinging spot size of the same order of magnitude as the largest dimension of the particles of the particle-binder layer of said unrecorded magnetizable medium to heat the particles of said medium to its Curie point; and means for deflecting said beam of coherent radiant energy to traverse a scanning pattern on the particle-binder layer of said unrecorded magnetizable medium.
Claim 9
Independent Claim
145 words
An apparatus comprising: a prerecorded magnetizable medium and an unrecorded magnetizable medium each having a particle-binder layer; means for positioning at least a portion of the particle-binder layer of said prerecorded magnetizable medium in slippage free intimate contact with the particle-binder layer of said unrecorded magnetizable medium and moving said prerecorded and unrecorded magnetizable mediums in a first direction; a laser for generating a beam of coherent radiant energy which is directed to impinge upon the particle-binder layer of said unrecorded magnetizable medium with an impinging spot size of the same order of magnitude as the largest dimension of the particles of the particle-binder layer of said unrecorded magnetizable medium to heat the particles of said medium to its Curie point; and means for deflecting said beam of coherent radiant energy to traverse a scanning pattern on the particle-binder layer of said unrecorded magnetizable medium.
Claim 10
Dependent Claim
34 words
An apparatus as defined in claim 7 wherein said first direction of movement of said prerecorded and said unrecorded magnetizable mediums is transverse to the scanning pattern of said beam of coherent radiant energy.
Claim 11
Dependent Claim
30 words
An apparatus as defined in claim 8 wherein said prerecorded magnetizable medium is a magnetic tape having video information recorded thereon and said unrecorded magnetizable medium is a magnetic tape.
Claim 12
Dependent Claim
24 words
An apparatus as defined in claim 9 wherein the particles of the particle-binder layer of said unrecorded magnetic tape are formed from chromium dioxide.
Claim 13
Dependent Claim
116 words
A process for replicating a prerecorded magnetizable medium, comprising the steps of: positioning at least a portion of the particle-binder layer of said prerecorded magnetizable medium in intimate contact with the particle-binder layer of an unrecorded magnetizable medium; generating a beam of energy and directing the beam to impinge upon the particle-binder layer of said unrecorded magnetizable medium with an impinging spot size of the same order of magnitude as the largest dimensions of the particles of the particle-binder layer of said unrecorded magnetizable medium to heat the particles of said medium to its Curie point; and deflecting said beam of energy to traverse a scanning pattern on the particle-binder layer of said unrecorded magnetizable medium.
Claim 14
Dependent Claim
116 words
A process for replicating a prerecorded magnetizable medium, comprising the steps of: positioning at least a portion of the particle-binder layer of said prerecorded magnetizable medium in intimate contact with the particle-binder layer of an unrecorded magnetizable medium; generating a beam of energy and directing the beam to impinge upon the particle-binder layer of said unrecorded magnetizable medium with an impinging spot size of the same order of magnitude as the largest dimensions of the particles of the particle-binder layer of said unrecorded magnetizable medium to heat the particles of said medium to its Curie point; and deflecting said beam of energy to traverse a scanning pattern on the particle-binder layer of said unrecorded magnetizable medium.
Claim 15
Dependent Claim
25 words
A process for replicating a prerecorded magnetizable medium as defined in claim 11 wherein said beam of energy is a beam of coherent radiant energy.
Claim 16
Dependent Claim
49 words
A process for replicating a prerecorded magnetizable medium as defined in claim 12 wherein said prerecorded and unrecorded magnetizable mediums are positioned in slippage free contact and including the step of moving said medium in a direction transverse to the scanning portion of said beam of coherent radiant energy.
Claim 17
Dependent Claim
24 words
A process for replicating a prerecorded magnetizable medium as defined in claim 13 wherein said beam of coherent radiant energy is a laser beam.
Claim 18
Dependent Claim
36 words
A process for replicating a prerecorded magnetizable medium as defined in claim 14 wherein said prerecorded magnetizable medium is a magnetic tape having video information recorded thereon and said unrecorded magnetizable medium is a magnetic tape.
Claim 19
Dependent Claim
30 words
A process for replicating a prerecorded magnetizable medium as defined in claim 15 wherein the particles of the particle-binder layer of said unrecorded magnetic tape are formed from chromium dioxide.
Claim 20
Dependent Claim
106 words
A process for replicating a prerecorded magnetizable medium, comprising the steps of: positioning at least a portion of the particle-binder layer of said prerecorded magnetizable medium in intimate contact with the particle-binder layer of an unrecorded magnetizable medium; heating portions of the unrecorded magnetizable medium to heat the particles of said unrecorded magnetizable medium to at least its Curie point, the heated portions having dimensions of the same order of the magnitude as the largest dimensions of the particLes of the particle-binder layer of said unrecorded magnetizable medium; and causing said heated portions to traverse a pattern on the particle-binder layer of said unrecorded magnetizable medium.
Claim 21
Dependent Claim
106 words
A process for replicating a prerecorded magnetizable medium, comprising the steps of: positioning at least a portion of the particle-binder layer of said prerecorded magnetizable medium in intimate contact with the particle-binder layer of an unrecorded magnetizable medium; heating portions of the unrecorded magnetizable medium to heat the particles of said unrecorded magnetizable medium to at least its Curie point, the heated portions having dimensions of the same order of the magnitude as the largest dimensions of the particLes of the particle-binder layer of said unrecorded magnetizable medium; and causing said heated portions to traverse a pattern on the particle-binder layer of said unrecorded magnetizable medium.
Claim 22
Independent Claim
121 words
An apparatus comprising: a prerecorded magnetizable medium and an unrecorded magnetizable medium each having a particle-binder layer; means for positioning at least a portion of the particle-binder layer of said prerecorded magnetizable medium in intimate contact with the particle-binder layer of said unrecorded magnetizable medium; a source of energy for heating portions of the particle-binder layer of said unrecorded magnetizable medium to heat the particles of said portion to at least its Curie point, said heated portions having dimensions of the same order of magnitude as the largest dimensions of the particles of the particle-binder layer of said unrecorded magnetizable medium; and means for causing said heated portions to traverse a pattern on the particle-binder layer of the unrecorded magnetizable medium.
Claim 23
Independent Claim
121 words
An apparatus comprising: a prerecorded magnetizable medium and an unrecorded magnetizable medium each having a particle-binder layer; means for positioning at least a portion of the particle-binder layer of said prerecorded magnetizable medium in intimate contact with the particle-binder layer of said unrecorded magnetizable medium; a source of energy for heating portions of the particle-binder layer of said unrecorded magnetizable medium to heat the particles of said portion to at least its Curie point, said heated portions having dimensions of the same order of magnitude as the largest dimensions of the particles of the particle-binder layer of said unrecorded magnetizable medium; and means for causing said heated portions to traverse a pattern on the particle-binder layer of the unrecorded magnetizable medium.
Claim 24
Dependent Claim
39 words
A process for replicating a prerecorded magnetizable medium as defined in claim 17 wherein said pattern is such that all the particles of the particle-binder layer of said unrecorded magnetizable medium are heated to at least their Curie point.
Claim 25
Dependent Claim
33 words
An apparatus as defined in claim 19 wherein said pattern is such that all the particles of the particle-binder layer of said unrecorded magnetizable medium are heated to at least their Curie point.
References Cited (Backward Citations)
US3368209A
Cited
US3496304A
Cited
US3582570A
Cited
US3652808A
Cited
US3689934A
Cited
US3699269A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |