Substrate for magnetic recording medium

Details Substrate for magnetic recording medium Substrate for magnetic recording medium

1995-05-22

1996-05-28

Levy, Stuart S.

Dynamic magnetic information storage or retrieval

Record medium

Disk

437947, 1566441, 1566571, G11B 582, H01L 21302

Patent

active

055217818

ABSTRACT:
Proposed is a substrate of a magnetic recording medium in the form of an annular disk made from a single crystal of silicon which is imparted with greatly improved mechanical strengths to withstand mechanical shocks and high-velocity revolution. Different from conventional annular disks as formed by a mechanical working to form the outer contour and the circular center opening, the peripheral surfaces of the inventive annular disk are freed from the work-stressed surface layer by a chemical etching treatment undertaken after the mechanical working.

REFERENCES:
patent: 5180469 (1993-01-01), Abe
patent: 5223450 (1993-06-01), Fujino et al.
patent: 5316620 (1994-05-01), Hasegawa et al.
Patent Abstracts of Japan, vol. 9, No. 37, Abstract of JP-59177729, Aug. 10, 1994, titled "Magnetic Disc".

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