Optical disk substrate and optical disk using the same

Details Optical disk substrate and optical disk using the same Optical disk substrate and optical disk using the same

1995-04-27

1996-07-30

Levy, Stuart S.

Dynamic information storage or retrieval

Storage medium structure

Adjuncts or adapters

G11B 724

Patent

active

055419100

ABSTRACT:
An optical disk substrate of resin, comprising a center hole and being composed of an inner circular-projected portion and an outer flat circumferential portion, the inner circular-projected portion having a circular projection projecting from at least one major surface of the substrate, the maximum height of the circular projection measured from the major surface of the outer flat circumferential portion being equal to or larger than 0.5 mm, the optical disk substrate is designed to satisfy the following equation or inequality:
V/V.sub.0 <1.5, where V stands for the volume of the circular-projected portion, and V.sub.0 stands for the volume of an annular body having the same radius as the circular-projected portion and the same thickness as the outer flat circumferential portion, and having a center hole of the same size as the center hole.

REFERENCES:
patent: 4634617 (1987-01-01), Ohta et al.
patent: 4658393 (1987-04-01), Ohta et al.
patent: 4866697 (1989-09-01), Yamaguchi et al.
patent: 4877667 (1989-10-01), Hattori et al.
patent: 4982399 (1991-01-01), Odawara et al.
patent: 5128818 (1992-06-01), Koizumi et al.
patent: 5167996 (1992-12-01), Kurisu et al.
IBM Technical Disclosure Bulletin; vol. 33; No. 8; Jan. 1991; p. 361.

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