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2007-12-11

2007-12-11

Korzuch, William R. (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S112230

Reexamination Certificate

active

10413999

ABSTRACT:
The depth of pits is determined by a trade-off between the level of a push-pull signal used for servo application by a push-pull method and the level of an RF signal as a reproduced signal of information. The depth d is set to be the optimum for a disk system, which has a refractive index n of a medium, an optical wavelength λ, and an optical system with a NA (Numerical Aperture) of 0.75. The most suitable depth d for both the push-pull signal level and the RF signal level falls within a range of λ/5.5n≦d≦λ/4.7n, the second most suitable depth d falls with a range of λ/5.5n≦d≦λ/4.5n, and the depth d as the widest standard falls within a range of λ/8n≦d≦λ/4.5n.

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