Optical recording medium employing an intermittent pattern for g

Details Optical recording medium employing an intermittent pattern for g Optical recording medium employing an intermittent pattern for g

1994-07-29

1997-04-29

Epps, Georgia Y.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692753, 369279, G11B 724

Patent

active

056256183

ABSTRACT:
An optical recording medium has a track format with a track pitch smaller than a diffraction limit of a light spot so as to realize an increased capacity and a higher density. A guide groove for tracking purposes is formed along each of the concentrically or spirally formed tracks in a periodic intermittent pattern with respect to a circumferential direction of the optical recording medium. The intermittent patterns of the guide grooves adjoining each other with respect to a radial direction of the optical recording medium are displaced in phase from each other. A light spot of a diameter greater than the track width is projected onto the optical recording medium in rotation and the position of the light spot is servo-controlled in the track width direction in such a manner that a light quantity distribution with respect to the track width direction of a reflected or transmitted light of the light spot diffracted by the selected guide groove maintains its symmetry in the track width direction.

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patent: 4949331 (1990-08-01), Maeda et al.
patent: 5084860 (1992-01-01), Maeda et al.

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