Dual biased static sensing magnetic transducer
OwnerJames D. Florainventor
Life of this patent
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Abstract
A dual biased magnetic transducer capable of sensing magnetically recorded data on a magnetic medium without any relative velocity between the transducer and the medium. The transducer includes a third DC bias field for aiding the DC field created by the data on the medium for substantially shifting the level in the AC carrier, thereby producing a computer compatible intelligible signal.
Claims5
A magnetic transducer for sensing and indicating the presence of an external magnetic field, the transducer comprising, in combination:
- a core formed from magnetic permeable material,
- a magnetic flux-conducting ring-shaped field sensor having a gap at one side, connected to the core at a point opposite said gap, said core and field sensor being magnetically isolated from one another, except at the point of contact, by high reluctance slots
- first flux inducing means for establishing a unidirectional magnetic flux within the core to bias said core for operation on a minor hysteresis loop of the core material,
- second flux inducing means for establishing an alternating magnetic flux within the core, said high reluctance slots diverting the unidirectional and alternating flux away from said gap, and
- an output coil wound around the core in which a composite output signal is induced in response to the unidirectional and alternating flux and the magnetic flux of the external magnetic field sensed by said ring sensor.
A magnetic transducer for sensing and indicating the presence of an external magnetic field, the transducer comprising, in combination:
- a core formed from magnetic material, the core including a first magnetic circuit and a second magnetic circuit, with a portion of the core being common to the first and second magnetic circuits, said common portion of the core containing high reluctance slots which magnetically isolate the first circuit from the second circuit except at their point of contact,
- first flux inducing means for establishing a unidirectional magnetic flux within the first magnetic circuit in the core to bias said core for operation on a minor hysteresis loop of the core material
- second flux inducing means for establishing an alternating magnetic flux within the first magnetic circuit in the core, said high reluctance slots preventing the alternating and unidirectional flux from entering the second magnetic circuit, and
- said second magnetic circuit being responsive to the external magnetic field
- an output coil wound around the core common to the first and second magnetic circuits in which coil an output signal is induced corresponding to the magnetic flux produced by the external magnetic field to be sensed, within the second magnetic circuit of the core.
A magnetic transducer for sensing and indicating the presence of an external magnetic field, said transducer comprising:
- a core formed of magnetically permeable material having an aperture in the lower extremity of said core creating a ring-shaped structure in close proximity to the external magnetic field to be sensed, said ring-shaped structure having a gap therein across which magnetic differentials are produced by the external magnetic field, said core having slots therein on either side of the ring-shaped structure, said slots creating a high reluctance to magnetically isolate said ring-shaped structure from the upper extremity of said core,
- a sense winding wound around said core and through said aperture,
- an AC bias field coil for generating time-varying lines of magnetic flux within said core in response to the application of an AC signal,
- Dc bias means for generating DC flux within said core to bias said core for operation on a minor hysteresis loop, and
- a magnetic coupler fabricated from magnetically permeable material and positioned contiguous to said core for guiding said time-varying flux and said DC flux through said sense winding and the upper extremity of said core, said high reluctance slots diverting the time varying and DC flux away from said gap.
Dependencies are inferred from the claim text.