Optical recording medium and optical recording device

Details Optical recording medium and optical recording device Optical recording medium and optical recording device

1998-08-07

2000-12-12

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

3692755, 428694DE, G11B 1100, G11B 724

Patent

active

06160769&

ABSTRACT:
A magneto-optical recording medium comprises a protective layer having a self-lubricating property formed at an uppermost layer on a side opposite to a substrate wherein a recording or reproducing light beam comes into a side of the protective layer. The thickness and the refractive index of the protective layer are selected under predetermined conditions depending on whether or not evanescent light is transmitted through the protective layer. It is possible to perform high density recording and reproduction thereof by utilizing the evanescent light. A protective layer having a self-lubricating property may be also formed on a bottom surface of an optical head opposing to the optical recording medium. Even when the optical head contacts with the surface of the optical recording medium, the sliding scratch scarcely occurs, because the optical head smoothly glides on the recording medium surface. It is possible to reduce the influence of multiple interference of light which would be otherwise caused in an air layer existing between the optical recording medium and the optical head, and it is possible to suppress variation in reproduced signal intensity.

REFERENCES:
patent: 5197050 (1993-03-01), Murakami et al.
patent: 5202880 (1993-04-01), Lee et al.
patent: 5353278 (1994-10-01), Murakami et al.
patent: 5463609 (1995-10-01), Inagaki et al.
patent: 5618617 (1997-04-01), Uchida et al.
Yoshito Tsunoda, "Foundation and Application of Optical Disk Storage", Incorporated Association of Society of Electronics Information and Communication, p. 65, (1995).
Nikkei Electronics, No. 686, pp. 13-14, (Apr. 7, 1997).

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