Optical disc substrate having relatively thicker central support

Details Optical disc substrate having relatively thicker central support Optical disc substrate having relatively thicker central support

1998-03-24

1999-12-07

Dinh, Tan

Dynamic information storage or retrieval

Storage medium structure

Specified center hole or locating structure

369290, G11B 370

Patent

active

059995130

ABSTRACT:
An optical disc substrate having a reduced thickness and sufficient rigidity is provided which can be of a single-plate structure. It can be compatible with a magneto-optic recording and also with a conventional disc driving means. The substrate consists of a disc supporting portion (21) formed around the center of the substrate and of which one side (21a) provides a surface at which the disc is to be mounted on a disc driving means, and a recording portion (22) formed between the disc supporting portion (22) and a circumference of the substrate and of which one side (22a) provides a recording surface. The disc supporting portion (21) is designed thicker than the recording portion (22) so that the disc supporting surface (21a) and the recording surface (22a) will not lie together in a sample plane. A recess 25 may be formed between the recording portion (22) and disc supporting portion (21), and also a projection (27) may be formed along the circumference of the side (22b). Furthermore, one or more functional layer may be formed on the side (22b) opposite to the recording surface.

REFERENCES:
patent: 2846230 (1958-08-01), Richter
patent: 3132866 (1964-05-01), Niti et al.
patent: 4910624 (1990-03-01), Peeters
patent: 5323381 (1994-06-01), Takahashi et al.
patent: 5448547 (1995-09-01), Minoda et al.
patent: 5541910 (1996-07-01), Tanaka et al.

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