Optical recording medium

Details Optical recording medium Optical recording medium

1993-01-22

1995-10-03

Wolff, John H.

Dynamic information storage or retrieval

Storage medium structure

Layered

369283, G11B 370

Patent

active

054558182

ABSTRACT:
An optical recording medium affording a maximum Kerr effect enhancement, yet exhibiting a good signal-to-noise ratio, includes, for example, a substrate, an interference layer, a tracking guide layer, and a recording layer which are successively formed one above the other in the stated order. The interference layer is made of a light transmissive material and has a refractive index that is larger than that of the substrate. The interference layer has a first portion etched to a predetermined depth (d) and a second portion having a predetermined thickness (D). The tracking guide layer is formed on the second portion of the interference layer in a predetermined pattern, e.g. spirally or coaxially, for obtaining a tracking signal for use in tracking servo. The thickness of the interference layer defined by D minus d is set substantially equal to (.lambda./4n)+M(.lambda./2n) where .lambda. is a wavelength of light for reading the information, n is a refractive index of the interference layer, and M is an integer.

REFERENCES:
patent: 4578788 (1986-03-01), Ahn et al.
patent: 4586173 (1986-04-01), Ando
patent: 4737877 (1988-04-01), Krongelb et al.
patent: 4918972 (1990-04-01), Kenny et al.
patent: 5089358 (1992-02-01), Taki et al.

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