Method for improving the flatness of glass disk substrates

Details Method for improving the flatness of glass disk substrates Method for improving the flatness of glass disk substrates

1995-07-31

1997-07-01

Ryan, Patrick

Stock material or miscellaneous articles

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428 642, 428426, 428432, 428913, 65 331, 65102, 65104, 65111, 65117, B32B 300

Patent

active

056436491

ABSTRACT:
The invention is a method for improving the flatness of nonmetallic substrates and preferably glass disks. The method comprises the steps of mounting the glass disk on a support. The support preferably comprises a refractory metal having a cooling rate substantially similar to the disk. The disk is then subjected to heating to a temperature in the anneal region for the given material for a period ranging from about 0.5 hours to 12 hours or longer, and then the disk is controllably cooled. The glass disk is preferably cooled at a rate of about 0.25.degree. C./minute to 1.5.degree. C./minute to room temperature. The invention also comprises a hard disk glass memory element and a data storage and retrieval device comprising this element.

REFERENCES:
patent: 3844757 (1974-10-01), Kaufman et al.
patent: 3883339 (1975-05-01), Michalik et al.
patent: 4102664 (1978-07-01), Dumbaugh, Jr.
patent: 4111675 (1978-09-01), Ballard
patent: 4566893 (1986-01-01), Hopkins et al.
patent: 5009694 (1991-04-01), Nishitani et al.
patent: 5015426 (1991-05-01), Maus et al.
patent: 5193037 (1993-03-01), Pace
patent: 5278709 (1994-01-01), Thornton et al.
patent: 5342426 (1994-08-01), Dumbaugh, Jr.
patent: 5351156 (1994-09-01), Gregory et al.

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