Dynamic information storage or retrieval – Storage medium structure – Specific disc profile
Patent
1992-12-31
1994-04-05
LaRoche, Eugene R.
Dynamic information storage or retrieval
Storage medium structure
Specific disc profile
369282, 369290, 369270, 369271, G11B 2300
Patent
active
053011830
ABSTRACT:
Information recording discs comprise a disc substrate having a recording layer on one side thereof, one hub having an insertion portion to be inserted into a center hole of the disc substrate and a flange portion to cover the disc substrate in the vicinity of the center hole, at least an apex of the insertion portion being composed of a magnetic material, the hub being inserted into the center hole so that the flange portion is positioned on the recording layer side of the disc substrate, and an adhesive layer is provided between the flange portion and the disc substrate. By this construction, a portion of the hub which protrudes from the back surface of the disc substrate, facing toward the spindle of a turn table can be altered in dimension and/or the diameter of the protrusion portion of the hub can be made smaller than that of the center hole of the disc substrate. Thus, the hub has a large degree of freedom of shape and can have a structure fitted to the shape of a turn table, while still providing a large adhesive surface between the hub and the disc substrate for strength.
REFERENCES:
patent: 4613921 (1986-09-01), Holmes
patent: 4827468 (1989-05-01), Odawara et al.
patent: 4860278 (1989-08-01), Nakahara
patent: 4871404 (1989-10-01), Murata et al.
Kurisu Masayoshi
Minoda Takeshi
LaRoche Eugene R.
Mitsui Petrochemical Industries Ltd.
Nguyen Tan
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