Disc-shaped carrier body for a recording medium and method for m

Details Disc-shaped carrier body for a recording medium and method for m Disc-shaped carrier body for a recording medium and method for m

1987-07-10

1989-02-07

Robinson, Ellis P.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

65 3013, 65 3014, 427128, 427129, 427132, 428 65, 428141, 428410, 428694, 428900, 428433, 428426, G11B 5704

Patent

active

048031062

ABSTRACT:
A disc-shaped nonmagnetic support body for a recording medium which can be magnetized particularly (vertically) has at least one flat side with a very smooth surface, on which at least one magnetizable storage layer can be placed. It should be possible to provide this carrier body readily with appropriate surfaces, and it should be dimensionally stable and sufficiently fracture-proof. A chemically hardened glass substrate is therefore provided which comprises, besides Na.sup.+ ions, K.sup.+ ions incorporated in zones near the surface and in addition Ag.sup.+ ions and/or Ag atoms. For hardening this glass substrate by means of an ion exchange process below the transformation temperature characteristic of the glass material, the substrate is advantageously placed for a predetermined time in a KNO.sub.3 melt, to which advantageously, maximally 10% by weight AgNO.sub.3 has been added. In addition, the still hot glass substrate taken from the melt again, is advantageously placed in a water vapor atmosphere of above 115.degree. C.

REFERENCES:
patent: 3790430 (1974-02-01), Mochel
patent: 4015045 (1977-03-01), Rinehart
patent: 4254189 (1981-03-01), Fisher
patent: 4411963 (1983-10-01), Aino
"IEEE Trans. Magn.": vol. Mag. 16, No. 1, Jan. 1980, pp. 71-76, vol. Mag. 20, No. 5, Sep. 1984, pp. 657-662, vol. Mag. 20, No. 5, Sep. 1984, pp. 675-680, vol. Mag. 14, No. 5, Sep. 1978, pp. 849-851.
"Glastechnische Berichte", vol. 55 (1982), pp. 171-181.
"Silikattechnik", vol. 32 (1981) 12, pp. 360-362.

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