Recording head and its application

Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k


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346 745, 346 742, G01D 1510




A recording head comprises a magnetically permeable substrate, a superconducting film formed on one side of said substrate, a means for producing a uniform magnetic field sustantially perpendicular to a surface of the superconducting film, and a means for locally destroying the superconductivity of the superconducting film so as to produce a pattern of normal conducting portions in the area of the superconducting film where the magnetic field is applied. A recording device comprises a recording head for producing a pattern of a magnetic field on a recording medium, a toner supply unit arranged in face-to-face relationship with the recording head at a spaced short distance from the head to form a visible pattern of magnetic toners on the recording medium, and a fixing unit for fixing the magnetic toners on the recording medium to complete a record. When electric signals are applied to the recording head, the superconducting film is locally changed from the superconducting state into the normal conducting state so that the magnetic field applied to the film may penetrate through normal conducting portions of the film to produce a magnetic pattern on the recording medium. Almost simultaneously with the formation of the magnetic dot pattern, a visible powder pattern is directly formed on the recording sheet, and then fixed on thereon by fusion.

patent: 4739342 (1988-04-01), Dove et al.


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