Dynamic magnetic information storage or retrieval – Record medium – Disk
Patent
1981-07-28
1983-11-15
Richardson, Robert L.
Dynamic magnetic information storage or retrieval
Record medium
Disk
156239, 156279, 427128, G11B 562
Patent
active
044159420
ABSTRACT:
The substrate 1 for magnetic disks takes the form of a laminate made up of a plurality of individual thin, fiber-reinforced, anisotropic and unidirectional lamellae. These lamellae are arranged staggered on top of each other at few angular spacings, i.e., at great angles of up to 60.degree., and are finally pressed together. The outer layers and lamellae, respectively, may be reinforced by stronger fibers or other material, such as carbon fibers outside and glass fibers inside, to influence the flexural modulus and the shearing modulus independently of each other. This makes for a substrate which consists of anisotropic material, whose characteristics are essentially isotropic, which is lighter than previously used substrates, and which has a higher critical number of revolutions.
REFERENCES:
patent: 3646533 (1972-02-01), Rosenblum
patent: 3761333 (1973-09-01), Kleinbeck et al.
patent: 4376963 (1983-03-01), Knoop
S. A. Tobias and R. N. Arnold "The Influence of Dynamical Imperfection on the Vibration of Rotating Disks" Proc. I.M.E. vol. 171, No. 2 (1957), pp. 669-690.
IBM Technical Disclosure Bulletin vol. 18, No. 9, Feb. 1976.
Frosch Albert
Hinkel Holger
Kraus Georg
International Business Machines - Corporation
Madden, Jr. Walter J.
Richardson Robert L.
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