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US4400752A
Expired / Lapsed
US
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Magneto-electric transducer for a magnetic recording system and recording system comprising such a transducer
Assignee: Compagnie Europeenne de Composants Electroniques LCC CICE
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Filing: 1980-07-16
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Granted: 1983-08-23
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Expires: 2000-07-16
Abstract
Abstract The invention is directed to transducers for recording on (writing) and playback from (reading) a magnetizable support medium. A single transducer (head) provides both record and playback functions. Recording is carried out using a winding for inducing an external magnetic flux across a gap in the transducer and playback is carried out by sensing an internal leakage flux using a Hall effect magneto-resistive element placed outside of a gap in the head. The magneto-resistive element delivers a substantially linear electrical signal response as a function of the magnetic field applied by relative motion between the transducer gap and the support medium.
Inventors
- 👤 Jacques Chabrolle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:29
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/027; G11B5/035; G11B5/127; G11B5/33; G11B5/37
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
107 words
A magneto-electric read/write transducer, comprising: a magnetic circuit in the form of a flat ring having external and internal faces and a single non-magnetic gap therein, for producing (a) an external flux across the gap at its external face for interacting with a magnetizable support medium and (b) a leakage flux across the gap at its internal face; a coil wound about the ring for inducing a flux in the magnetic circuit; and a magneto-sensitive element positioned internal of the ring substantially within a region that would be subjected to the leakage flux for generating an electrical signal responsive to the leakage flux in the magnetic circuit.
Claim 2
Dependent Claim
107 words
A magneto-electric read/write transducer, comprising: a magnetic circuit in the form of a flat ring having external and internal faces and a single non-magnetic gap therein, for producing (a) an external flux across the gap at its external face for interacting with a magnetizable support medium and (b) a leakage flux across the gap at its internal face; a coil wound about the ring for inducing a flux in the magnetic circuit; and a magneto-sensitive element positioned internal of the ring substantially within a region that would be subjected to the leakage flux for generating an electrical signal responsive to the leakage flux in the magnetic circuit.
Claim 3
Dependent Claim
26 words
A transducer according to claim 1, wherein the internal and external faces have a generally cylindrical form with generatrices perpendicular to the plane of the ring.
Claim 4
Dependent Claim
26 words
A transducer according to claim 1, wherein the portions of said external and internal faces on to which said air-gap opens are respectively convex and concave.
Claim 5
Dependent Claim
22 words
A transducer according to claim 1, wherein the portions of said external and internal faces on which said air-gap opens are convex.
Claim 6
Dependent Claim
16 words
A transducer according to claim 1, wherein said magneto-sensitive element is of the "Hall effect" type.
Claim 7
Dependent Claim
165 words
A magnetic recording/playback system comprising a magneto-electric read/write transducer including a magnetic circuit in the form of a flat ring having external and internal faces and a single non-magnetic gap therein, for producing (a) an external flux across the gap at its external face for interacting with a magnetizable support medium and (b) a leakage flux across the gap at its internal face; a coil wound about the ring for inducing a flux in the magnetic circuit; and a magneto-sensitive element positioned internal of the ring substantially within a region that would be subjected to the leakage flux for generating an electrical signal responsive to the leakage flux in the magnetic circuit; a recording amplifier having an input for coupling to a signal to be recorded and an output coupled to the coil; a playback amplifier having an input coupled to a signal output of the magneto-sensitive element for amplifying a read signal generated thereby and providing at an output thereof an amplified playback signal.
Claim 8
Dependent Claim
165 words
A magnetic recording/playback system comprising a magneto-electric read/write transducer including a magnetic circuit in the form of a flat ring having external and internal faces and a single non-magnetic gap therein, for producing (a) an external flux across the gap at its external face for interacting with a magnetizable support medium and (b) a leakage flux across the gap at its internal face; a coil wound about the ring for inducing a flux in the magnetic circuit; and a magneto-sensitive element positioned internal of the ring substantially within a region that would be subjected to the leakage flux for generating an electrical signal responsive to the leakage flux in the magnetic circuit; a recording amplifier having an input for coupling to a signal to be recorded and an output coupled to the coil; a playback amplifier having an input coupled to a signal output of the magneto-sensitive element for amplifying a read signal generated thereby and providing at an output thereof an amplified playback signal.
Claim 9
Dependent Claim
29 words
A system according to claim 6 further comprising a feedback circuit for coupling a signal from the output of the playback amplifier to the input of the recording amplifier.
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) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |