Optical disk and optical disk apparatus

Details Optical disk and optical disk apparatus Optical disk and optical disk apparatus

1998-06-12

1999-09-28

Neyzari, Ali

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692753, G11B 724

Patent

active

059599634

ABSTRACT:
An optical disk with sectional trapezoidal pits comprising a substrate having information recorded by a plurality of pit trains formed thereon at a specified track pitch, and a reflective layer formed on the substrate, wherein the information is reproduced by being irradiated with light beam via an objective lens, the track pitch is set within the range of (0.72 to 0.8) .alpha..times..lambda./NA/1.14 .mu.m when a wavelength of the light beam is .mu. nm and a numerical aperture of the objective lens is NA, each of the pits is a multiplication ratio used to secure allowable disk tilt angles in an upper width within the range of (0.3 to 0.50) .alpha..times..lambda./NA/1.14 .mu.m, a bottom width within the range of (0.2 to 0.32) .alpha..times..lambda./NA/1.14 .mu.m and a depth within the range of (1/4.2.times..lambda.
) to (1/5.2 .lambda.
) (n: refractive index of said substrate and .lambda.: a wavelength) and obtained by 2.623.times.10.sup.-7 .times.(d/.lambda.).sup.2 -1.706.times.10.sup.-4 (d.sub.s /.lambda.)+0.934, where d.sub.s is thickness of the substrate.

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