Stock material or miscellaneous articles – All metal or with adjacent metals – Having metal particles
Patent
1986-03-06
1988-05-24
Pianalto, Bernard D.
Stock material or miscellaneous articles
All metal or with adjacent metals
Having metal particles
427 48, 427128, 427132, 427250, 427259, 427264, 427287, 427295, 428 64, 4283044, 428458, 428551, 428601, 428611, 428615, 428693, 428694, 428900, 428928, H01F 1002
Patent
active
047465808
ABSTRACT:
A method of making read-only magnetic recording media by the use of photolithographic/photoresist techniques, and the vacuum deposition of discrete bits of a high coercivity metal, followed by magnetization of said metal. A nonmagnetic substrate is covered by a layer of photoresist and a layer of high coercivity magnetic material. Selective light-pattern exposure of the resist, followed by layer-removal-procedures, cause the substrate to be covered by islands of hard magnetic material, in the pattern of a desired data track. The substrate is then subjected to the influence of a steady-state magnetic field in order to convert the metal islands into a read-only data pattern which can be read by a magnetic head. A floppy disk of this type is used to stress-test the head placement of floppy disk drives.
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IBM Technical Disclosure Bulletin, vol. 16, No. 4, Sep. 1973, "Magnetic Head Position Sensing", by N. B. Taylor, pp. 1338-1340.
IBM Technical Disclosure Bulletin, vol. 20, No. 5, Oct. 1977, "Read/Write Magnetic Azimuth Adjustment Method", by R. G. Hart et al., pp. 1897-1901.
IBM Technical Disclosure Bulletin, vol. 24, No. 4, Sep. 1981, "Lift-Off Pattern Generation in Sputtered Films", by R. W. Burkhart et al., pp. 2081-2083.
Bishop Ross W.
Moxley Arthur E.
International Business Machines - Corporation
Pianalto Bernard D.
Sirr Francis A.
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