Optical memory having narrowed track pitch

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

1996-08-01

1997-10-14

Breneman, R. Bruce

Etching a substrate: processes

Forming or treating optical article

216 65, 216 79, 216 54, 430321, G11B 726

Patent

active

056768540

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.

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patent: 5015338 (1991-05-01), Tabuchi et al.
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"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, pp. 204-213, 1989.
"Design of the Pregroove-Shape on an Optical Disc Based on the Light Diffraction Analysis", Teruo Murakami, Electronics and Communications in Japan, vol. 67-C, No. 6, pp. 104-113, 1984.

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