Optical recording medium having grooves and lands and/or plural

Details Optical recording medium having grooves and lands and/or plural Optical recording medium having grooves and lands and/or plural

1994-04-25

1996-06-25

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

3692754, 369109, 369 93, G11B 7007

Patent

active

055306411

ABSTRACT:
A recording film of a recording medium has tracks with a track pitch of 1.6 .mu.m. Each track has a land and a groove, and the width of each of the land and groove is about 0.8 .mu.m. The groove and land differ relatively in height by a degree corresponding to (2n-1)/4 (n: a natural number) times the wavelength of the irradiated beam. At the time of reproduction, reflected diffraction beam components reflected from the land and groove are provided with a phase difference .pi.. Thus, a peak of the diffraction beam is concentrated within the range of the NA of an objective lens, with high intensity. As a result, the presence/absence of pits located at a distance less than a diffraction limit, which have not been detected in the prior art, can be detected.

REFERENCES:
patent: 4160269 (1979-07-01), Kramer et al.
patent: 4359750 (1982-11-01), Howe
patent: 4423502 (1983-12-01), Dil
patent: 4822151 (1989-04-01), Tatsuno et al.
patent: 4932015 (1990-06-01), Nagashima et al.
patent: 5121378 (1992-06-01), Hirose et al.
Extended Abstracts "The 37th Spring Meeting, 1990"; Japan Society of Applied Physics & Related Societies No. 3; p. 926.
SPIE vol. 1078 Optical Data Storage Topical Meeting (1989), pp. 98-104.

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