Beryllium memory disk substrate for computer hard disk drive and

Details Beryllium memory disk substrate for computer hard disk drive and Beryllium memory disk substrate for computer hard disk drive and

1996-08-09

1998-09-01

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 643, 428 644, 428457, 428913, 369288, 51309, 216 88, 216 89, 451 57, 451287, B32B 300, B24B 100

Patent

active

058008950

ABSTRACT:
A Beryllium disk drive substrate is prepared using a Beryllium metal having a starting modulus of elasticity (stiffness) of about 4.2 times that of Aluminum, in which the beryllium is separated into circular disks and processed by a sequence of lapping, heat-treating under pressure, cooling under pressure and polishing steps which retains the desirable metallurgical characteristics of the starting metal and provides sufficiently high quality surface finish, thermal conductivity and low mass density, to enable improved rotational speeds, acceleration/deceleration rates and information packing density for demanding disk drive applications.

REFERENCES:
patent: 4707431 (1987-11-01), Umehara
patent: 4956216 (1990-09-01), Hausler et al.
patent: 5260847 (1993-11-01), Bashore et al.
patent: 5417778 (1995-05-01), Nachtrab et al.
patent: 5421916 (1995-06-01), Nachtrab et al.

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