Optical disk with reinforcing plate

Details Optical disk with reinforcing plate Optical disk with reinforcing plate

1994-08-24

1999-11-16

Evans, Jefferson

Dynamic information storage or retrieval

Storage medium structure

Adjuncts or adapters

360133, G11B 2303

Patent

active

059870044

ABSTRACT:
An optical disk recording medium includes a single layer disk substrate having a hub provided on one side which includes a circular magnetic plate for effecting chucking of the optical disk. On the opposite side of the disk substrate a reinforcing plate is attached for reducing disk warpage during chucking, loading etc. The circular magnetic plate includes a centering opening for disk chucking, while a center opening of the reinforcing plate is larger in diameter than the centering opening. The reinforcing plate covers a central opening formed in the disk substrate and includes a boss portion which is projected into the opening. A groove is provided in the reinforcing plate at the outer circumference of the boss portion for retaining excess adhesive when the substrate is affixed to the reinforcing plate.

REFERENCES:
patent: 4694370 (1987-09-01), Ommori et al.
patent: 4695910 (1987-09-01), Maruyama et al.
patent: 4710913 (1987-12-01), Matsushima et al.
patent: 4871404 (1989-10-01), Murata et al.
patent: 4944982 (1990-07-01), Kikuchi
patent: 5257154 (1993-10-01), Sato
patent: 5265086 (1993-11-01), Ota et al.
patent: 5369632 (1994-11-01), Takahashi

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