US3816850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording method and apparatus using a multi-layer recording technique
Assignee: NEC Corp
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Filing: 1972-11-09
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Granted: 1974-06-11
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Expires: 1992-11-09
Abstract
Abstract According to this multi-layer recording technique, a relatively low-frequency signal track is recorded on a magnetic tape in the direction of the tape''s motion. A plurality of second relatively high-frequency tracks are recorded by one or more magnetic heads. The gap of the head or heads forms an acute angle with the second tracks such that sine component of the gap with respect to that angle is an integral multiple of the pitch of the second tracks.
Inventors
- 👤 H Otsuka
- 👤 N Manabe
- 👤 T Konishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:38
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/78; H04N5/782; H04N5/7824; H04N5/7826
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
108 words
A magnetic recording apparatus comprising: first means for recording a relatively low frequency signal on a magnetic tape in the direction in which the tape is transported so as to form a first recorded track thereon; second means for recording a relatively high frequency signal on said magnetic tape in a direction traversing said first recorded track to form a plurality of second recorded tracks thereon; said first means defining a gap which forms an acute angle with said second tracks such that the sine component of said acute angle multiplied by the length of said gap is an integral multiple of the pitch of said second tracks.
Claim 2
Dependent Claim
108 words
A magnetic recording apparatus comprising: first means for recording a relatively low frequency signal on a magnetic tape in the direction in which the tape is transported so as to form a first recorded track thereon; second means for recording a relatively high frequency signal on said magnetic tape in a direction traversing said first recorded track to form a plurality of second recorded tracks thereon; said first means defining a gap which forms an acute angle with said second tracks such that the sine component of said acute angle multiplied by the length of said gap is an integral multiple of the pitch of said second tracks.
Claim 3
Dependent Claim
66 words
The apparatus of claim 1 further comprising: third means for scanning said first recorded tracks; and fourth means for scanning said second recorded tracks; said third means defining a gap which forms an acute angle with said second tracks such that the sine component of said acute angle multiplied by the length of said gap is an integral multiple of the pitch of said second tracks.
Claim 4
Dependent Claim
31 words
The apparatus of claim 1, wherein said relatively high frequencY signal is a video signal, sand said second recording means comprises four heads mounted in quadrature relationship on a rotatable disc.
Claim 5
Dependent Claim
28 words
The apparatus of claim 3, wherein said first recording means comprises a plurality of magnetic heads for recording a plurality of audio signals containing speech in different languages.
Claim 6
Independent Claim
105 words
A method of recording signals on a magnetic tape comprising: recording a relatively low frequency signal on said magnetic tape by passing along the tape a recording head defining a gap so as to form a first track thereon; and recording a relatively high frequency signal on said tape in a direction traversing said first track to form a plurality of second recorded tracks thereon, said gap forming an acute angle with respect to the second tracks such that the sine component of the said acute angle multiplied by the length of said gap is an integral multiple of the pitch of said second tracks.
Claim 7
Independent Claim
105 words
A method of recording signals on a magnetic tape comprising: recording a relatively low frequency signal on said magnetic tape by passing along the tape a recording head defining a gap so as to form a first track thereon; and recording a relatively high frequency signal on said tape in a direction traversing said first track to form a plurality of second recorded tracks thereon, said gap forming an acute angle with respect to the second tracks such that the sine component of the said acute angle multiplied by the length of said gap is an integral multiple of the pitch of said second tracks.
Claim 8
Dependent Claim
28 words
The method of claim 5, wherein said relatively high frequency signal is a video signal and is recorded by rotating four heads in quadrature relationship to each other.
Claim 9
Dependent Claim
14 words
The method of claim 6, wherein said low frequency signal is an audio signal.
Claim 10
Dependent Claim
29 words
The method of claim 6, wherein said low frequency signal includes a plurality of speech signals in different languages, each speech signal being recorded by a different magnetic head.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |