Optical memory having narrowed track pitch

Details Optical memory having narrowed track pitch Optical memory having narrowed track pitch

1994-12-12

1996-12-17

Nelms, David C.

Dynamic information storage or retrieval

Storage medium structure

Special groove

3692751, 3692754, G11B 724, G11B 370

Patent

active

055861091

ABSTRACT:
A transparent substrate of an optical memory is produced by injection molding using a stamper. Grooves and lands are alternately arranged on the optical memory, for tracking of light converged on the optical memory. The groove width is set in the range of 0.3 .mu.m to 0.4 .mu.m and the groove depth is set in the rage of 80 nm to 100 nm. A decrease in the width of a land at each edge is restrained to 0.2 .mu.m in maximum. With such dimensions, even when the track pitch is set to about 1.4 .mu.m, it is possible to obtain a track crossing signal with intensity sufficient for performing an access operation to a target track. Moreover, since the dimensions bring about an improved reflectance at a land, the optical memory achieves an improved C/N and recording density.

REFERENCES:
patent: 4385303 (1983-05-01), Akahira
patent: 4680742 (1987-07-01), Yamada
patent: 4734904 (1988-03-01), Imanaka
patent: 4817053 (1989-03-01), Ikeda
patent: 4946730 (1990-08-01), Inui
patent: 5228001 (1993-07-01), Birge
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"Optimization of pregroove and prepit shape for the push-pull tracking method" (Proceedings of Symposium on Optical Memory, 1990) (Translation of relevant passages provided).
"Optical pregroove dimensions: design considerations" M. Yamamoto et al. Applied Optics, vol. 25, No. 22, Nov. 15, 1986.
"Magneto-optical disk by contact printing method" T. Inui et al.; SPIE vol. 1078, Optical Data Storage Topical Meeting, 1989.
Inui et al., "Magneto-Optical Disk by Contact Printing Method" (SPIE-Optical Data Storage Topical Meeting, vol. 1078, 1989) pp. 204-213.
Teruo Murakami, "Design of the Pregrove-Shape on an Optical Disc Based on the Light Diffraction Analysis" (433 Electronics & Communications in Japan 67 (1984) Jun., No. 6, Silver Spring, Maryland, USA) pp. 104-113.

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