Information recording medium

Details Information recording medium Information recording medium

1989-12-28

1993-06-01

LaRoche, Eugene R.

Dynamic information storage or retrieval

Storage medium structure

Special groove

3692754, 369284, G11B 726

Patent

active

052166651

ABSTRACT:
An optical recording medium is formed by applying a coating liquid to form a light-reflecting layer on a substrate having a surface provided with a pre-format pattern comprising a concavity and a convexity. The concavity is designed to have a sectional shape of a trapezoid having a pair of parallel opposite sides, a shorter one of which constitutes the bottom of the concavity, and a pair of sloping sides. Each sloping side forms a (solid part) angle .theta. of not larger than 35 degrees with respect to the extension of the substrate surface. The concavity has a depth d larger than .lambda./4n wherein .lambda. is the wavelength of an optical radiation beam with which the optical recording medium is illuminated for recording and/or reproduction and n is the refractive index of the substrate.

REFERENCES:
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patent: 4711798 (1987-12-01), Ueda et al.
patent: 4868808 (1989-09-01), Tinet
patent: 4925733 (1990-05-01), Imataki et al.
patent: 4956214 (1990-09-01), Imataki et al.
patent: 4972402 (1990-11-01), Miura et al.

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