Information medium with improved temperature characteristics

Details Information medium with improved temperature characteristics Information medium with improved temperature characteristics

1991-12-06

1993-11-23

Shepperd, John

Dynamic information storage or retrieval

Storage medium structure

Adjuncts or adapters

369270, 369271, G11B 724

Patent

active

052650871

ABSTRACT:
An information memory medium (10) includes disk-shaped substrates (30a, 30b) and recording layers (32a, 32b). It also has a centering member (38a, 38b) whose coefficient of thermal expansion resembles that of the substrates (30a, 30b). Two flat magnetic members (40a, 40b) are situated in annular depressions (68a, 68b) provided in the centering member. The annular depressions are larger than the magnetic members so that differences in thermal expansion can be absorbed.

REFERENCES:
patent: 3706085 (1972-12-01), Mowrey et al.
patent: 4322841 (1982-03-01), Borchard et al.
patent: 4634617 (1987-01-01), Ohta et al.
patent: 4733388 (1988-03-01), Fujimoto et al.
patent: 4785444 (1988-11-01), Nakane et al.
patent: 4827470 (1989-05-01), Odawara et al.
patent: 4866697 (1989-09-01), Yamaguchi et al.

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