Recorders – Magnetographic – Magnetochemical or physical chemistry
Patent
1984-07-30
1986-09-23
Evans, A.
Recorders
Magnetographic
Magnetochemical or physical chemistry
358301, 360125, G01D 1512
Patent
active
046138749
ABSTRACT:
Improved means and method for information transfer through magnetic field pulses over an area and at electronic information flow rates consisting of establishing a bias level magnetic field just below the threshold field strength required to transfer information by means of magnetic recording, then adding to the bias field by sequentially inducing low field strength magnetic fields from high speed, low current electrical signals sweeping through an x, y solenoid matrix, the combination effecting microsecond rate magnetic recording and information transfer onto a magnetochemical surface.
The bias field is established using a suitably shaped permanent magnet material and conducting the magnetic field directly to the recording area upon a point to point basis through a sheaf of magnetic field conducting wires, the sheaf is surrounded by an external coil of electrical wire capable, with current flow, of modulating the magnet established bias field transmitted through the sheaf of wires to the base of a printed circuit board carrying the x, y distribution of tiny solenoids, each centered with a pre-oriented magnetic metal core and each core placed in contact with one of the bias magnetic field carrying wires of the sheaf, the combination operable with electronic information interfacing through high speed low current pulses inducing magnetic fields that add to the bias field and effect point to point magnetic field recording upon a magnetochemical surface placed against the surface of the solenoid.
REFERENCES:
patent: 3017234 (1962-01-01), Trimble et al.
patent: 3512169 (1970-05-01), Trimble
patent: 3810191 (1974-05-01), Stauffer
patent: 3911552 (1975-10-01), Trimble et al.
patent: 4414554 (1983-11-01), Springer
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