Optical disc with magnetic member in a recessed portion thereof

Details Optical disc with magnetic member in a recessed portion thereof Optical disc with magnetic member in a recessed portion thereof

1994-02-28

1999-01-12

Evans, Jefferson

Dynamic information storage or retrieval

Storage medium structure

Adjuncts or adapters

G11B 2300

Patent

active

058598340

ABSTRACT:
An optical disc includes a disc base plate of a light-transmitting synthetic material having a recess for mounting a magnetic plate, and a holding part, integral with the disc base plate, for loosely holding the magnetic plate mounted in the recess with respect to the disc base plate. It is possible with the present optical disc to prevent distortion of the disc base plate otherwise caused by the difference in thermal expansion coefficients of the two components to inhibit double refraction of the disc base plate otherwise caused by such distortion to maintain good recording/reproducing characteristics.

REFERENCES:
patent: 4687536 (1987-08-01), Hiramatsu et al.
patent: 4787009 (1988-11-01), Takahashi
patent: 4797764 (1989-01-01), Doering
patent: 4827468 (1989-05-01), Odawara et al.
patent: 4903224 (1990-02-01), Namiki et al.
patent: 4944982 (1990-07-01), Kikuchi
patent: 4981538 (1991-01-01), Kikuchi
patent: 5115961 (1992-05-01), Nakajima
patent: 5323381 (1994-06-01), Takahashi et al.

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