US4823211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary magnetic tape transducer headwheel structure
Assignee: Philips GmbH
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Filing: 1987-09-14
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Granted: 1989-04-18
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Expires: 2007-09-14
Abstract
Abstract To effectively eliminate cross-talk between the weak signals picked up by a tape transducer pick-up head with signals being applied to a recording head, a disk-like headwheel carrier has a disk-like headwheel secured thereto. The disk-like headwheel carrier is formed with a recess which defines a chamber (6) in which the preamplifier for the reproduced signals is placed. Transducer leads are passsed in a channel duct formed between the headwheel carrier and the disk-like headwheel, which is in plate form. Preferably, both the disk-like headwheel as well as the carrier are made of lightweight metal, such as aluminum, so that the reproducing amplifier is totally shielded. The recording amplifier can be placed on top of the disk-like headwheel, separated and shielded from the reproducing preamplifier.
Inventors
- 👤 Axel Schulz
- 👤 Manfred Hescher
- 👤 Berthold Eiberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:16
CPC Classifications
G; G11; G11B; G11B33/00; G11B33/12; G11B5/00; G11B5/48; G11B5/52; G11B5/53
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
144 words
Rotary headwheel structure (1), for recording and reproduction of signals on and from, respectively. a magnetic recording medium such as magnetic tape, having a disk-like headwheel carrier (2) having an upper-face (3); a disk-like headwheel (4) having a lower-face, secured to the upper-face of the headwheel carrier; a plurality of recording/reproducing transducer heads (8) secured to the headwheel; reproducing preamplifier means coupled to the transducer heads; and an amplifier carrier plate (7) secured to the headwheel for rotation therewith and mechanically supporting said reproduction preamplifier means and wherein, in accordance with the invention, at least one of: the upper-face of the headwheel carrier (2); the lower-face of the headwheel disk (4) are formed with a recess defining an annular chamber (6) and wherein at least part of the amplifier carrier plate (7) and the reproduction preamplifier means thereon is located in said chamber (6).
Claim 2
Dependent Claim
144 words
Rotary headwheel structure (1), for recording and reproduction of signals on and from, respectively. a magnetic recording medium such as magnetic tape, having a disk-like headwheel carrier (2) having an upper-face (3); a disk-like headwheel (4) having a lower-face, secured to the upper-face of the headwheel carrier; a plurality of recording/reproducing transducer heads (8) secured to the headwheel; reproducing preamplifier means coupled to the transducer heads; and an amplifier carrier plate (7) secured to the headwheel for rotation therewith and mechanically supporting said reproduction preamplifier means and wherein, in accordance with the invention, at least one of: the upper-face of the headwheel carrier (2); the lower-face of the headwheel disk (4) are formed with a recess defining an annular chamber (6) and wherein at least part of the amplifier carrier plate (7) and the reproduction preamplifier means thereon is located in said chamber (6).
Claim 3
Dependent Claim
18 words
The structure of claim 1, wherein the chamber is formed in the upper-face of the headwheel carrier (2).
Claim 4
Dependent Claim
57 words
The structure of claim 1, wherein the chamber (6) is ring-shaped, and formed in the upper-face of the headwheel carrier (2), said headwheel carrier having a projecting centering stub (6) and an external ring-shaped engagement surface, said ring-shaped chamber being located between the centering stub and the external engagement surface, for reception of the reproduction preamplifier means.
Claim 5
Dependent Claim
44 words
The structure of claim 3, wherein said ring-shaped chamber (6) is closed by the headwheel disk (4), the lower surface of the headwheel disk fitting against the ring-shaped upper surface of the headwheel carrier and, the headwheel disk being centered by said centering stub.
Claim 6
Dependent Claim
22 words
The structure of claim 1, wherein both the headwheel carrier (2) and said headwheel disk (4) are made of electrically conductive material.
Claim 7
Dependent Claim
20 words
The structure of claim 1, wherein both said headwheel carrier (2) and said headwheel disk (4) are made of metal.
Claim 8
Dependent Claim
26 words
The structure of claim 1, wherein the magnetic heads for reproduction are located on a theoretical planar surface conicident with the upper-face of the headwheel carrier.
Claim 9
Dependent Claim
22 words
The structure of claim 1, wherein the magnetic heads (8) for reproduction are located on the lower-face of the headwheel disk (4).
Claim 10
Dependent Claim
34 words
The structure of claim 8, wherein the headwheel disk (4) is formed with ducts or grooves (11) to provide space to pass connecting lines from the respective reproduction heads to the reproduction preamplifier means.
Claim 11
Dependent Claim
53 words
The structure of claim 8, wherein the upperface (3) of the headwheel carrier (2), in the parts of the region of engagement of the headwheel disk (4) on the headwheel carrier, is formed with grooves or channels (11) to permit passage of connection wires from the reproduction heads to the reproduction preamplifier means.
Claim 12
Dependent Claim
20 words
The structure of claim 1, further including a recording amplifier (13) located on an upper-face of the headwheel disk (4).
Claim 13
Dependent Claim
51 words
The structure of claim 11, wherein both said headwheel carrier (2) and said headwheel disk (4) are made of metal, the metal of the headwheel disk providing for shielding and electrical inductive separation of signals in the reproduction preamplifier and on the preamplifier carrier plate (7) and the recording amplifier (13).
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) | 1992-04-17 | 1992-10-17 | 1993-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-17 | 1996-10-17 | 1997-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-17 | 2000-10-17 | 2001-04-18 | $7700.00 | Window Closed / Lapsed |