Patent US4358799A successfully refreshed from Google Patents.
US4358799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for recording and/or reproducing signals
Assignee: US Philips Corp
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Filing: 1980-01-07
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Granted: 1982-11-09
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Expires: 2000-01-07
Abstract
Abstract A helical scan video recorder having a reduced drum diameter in comparison with a two-head video recorder by the use of n heads, n being greater than two, and a tape wrap angle greater than ##EQU1## An important additional advantage of this recorder is that reproduction during recording (monitoring) is possible without the use of additional heads.
Inventors
- 👤 Edmond deNiet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:02
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/12; G11B15/14; G11B5/00; G11B5/48; G11B5/52; G11B5/53; G11B5/531; G11B5/534
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
An apparatus for recording and/or reproducing signals on a magnetic tape, said apparatus comprising a generally cylindrical head drum having a circumferential gap disposed in a plane normal to the axis of the drum, a head support mounted inside said drum for rotation about said axis, at least three heads supported on said support for rotation therewith in the plane of said gap, said heads being disposed opposite said gap and uniformly spaced from each other, and means for guiding the magnetic tape along a helical path around said drum over at least ##EQU8## of the circumference of said drum with a pitch such that at least ##EQU9## of the gap circumference is covered by said tape, wherein n is the number of heads, so that, upon rotation of said support, successive heads make magnetic contact with said tape through said gap.
Claim 2
Independent Claim
142 words
An apparatus for recording and/or reproducing signals on a magnetic tape, said apparatus comprising a generally cylindrical head drum having a circumferential gap disposed in a plane normal to the axis of the drum, a head support mounted inside said drum for rotation about said axis, at least three heads supported on said support for rotation therewith in the plane of said gap, said heads being disposed opposite said gap and uniformly spaced from each other, and means for guiding the magnetic tape along a helical path around said drum over at least ##EQU8## of the circumference of said drum with a pitch such that at least ##EQU9## of the gap circumference is covered by said tape, wherein n is the number of heads, so that, upon rotation of said support, successive heads make magnetic contact with said tape through said gap.
Claim 3
Dependent Claim
81 words
The apparatus according to claim 1 including a signal input for applying to said heads a signal to be recorded on said tape, first switching means for sequentially connecting said signal input to the heads in accordance with a cyclic permutation in synchronism with the rotation of said head support such that respective heads are sequentially connected to said signal input in a sequence corresponding to the direction of rotation of said head support for ##EQU10## part of a revolution thereof.
Claim 4
Dependent Claim
60 words
The apparatus according to claim 2 including a signal output for supplying a signal reproduced from said tape and second switching means for connecting said heads to said signal output in a way such that a head which makes magnetic contact with the tape and which is not simultaneously connected to said signal input is connected to said signal output.
Claim 5
Dependent Claim
70 words
The apparatus according to claim 3 including means for actuating said second switching means in synchronism with the rotation of said head support and with said first switching means in a way such that a given head is connected to said signal output by said second switching means one revolution of said head support after said given head has been connected to said signal input by said first switching means.
Claim 6
Dependent Claim
79 words
The apparatus according to claim 1 including a signal output for supplying a signal reproduced from said tape and switching means for sequentially connecting said signal output to said heads in accordance with a cyclic permutation in synchronism with the rotation of said head support such that said heads are sequentially connected to said signal output in a sequence corresponding to the direction of rotation of the head support for ##EQU11## part of a revolution of said head support.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-08 | 1986-05-10 | 1986-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-08 | 1990-05-10 | 1990-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-08 | 1994-05-10 | 1994-11-09 | $7700.00 | Window Closed / Lapsed |