Information recording disk having a stepped central recess and h

Details Information recording disk having a stepped central recess and h Information recording disk having a stepped central recess and h

1993-12-06

1996-04-02

Levy, Stuart S.

Dynamic information storage or retrieval

Storage medium structure

Specified center hole or locating structure

360135, G11B 370

Patent

active

055047351

ABSTRACT:
An information recording disk formed from two substrates with a stepped central opening for receiving a hub within the stepped recess of at least one of the substrates is provided. In one embodiment, the central aperture of the first substrate is larger than the central aperture of the second substrate to form the stepped recess. In another embodiment, at least one substrate has a stepped surface defining a central aperture and a hub structure is mounted within this stepped recess to reduce overall thickness of the disk.

REFERENCES:
patent: 4641152 (1987-02-01), Fedder et al.
patent: 4710913 (1987-12-01), Matsushima et al.
patent: 4785444 (1988-11-01), Nakama et al.
patent: 4827468 (1989-05-01), Odawara et al.
patent: 4827470 (1989-05-01), Odawara et al.
patent: 4839208 (1989-06-01), Nakagawa et al.
patent: 5265086 (1993-11-01), Ota et al.

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