Optical recording medium having servo area and groove section

Details Optical recording medium having servo area and groove section Optical recording medium having servo area and groove section

2007-01-23

2007-01-23

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S275400, C369S047220

Reexamination Certificate

active

10437180

ABSTRACT:
The present invention provides an optical recording medium capable of detecting groove start signals and groove end signals with an inexpensive detection circuit and allowing quick, stable clock detection and tracking pull-in, which optical recording medium is constructed in such a way that the depth DGof the grooves satisfies DG/(λ/N)<0.16, where λ is a wavelength of a light beam and N is an index of refraction of a substrate, and that the distance Lsbetween the groove edge and the pit closest thereto satisfies Ls>1.2 FWHM, where FWHM is a full width at half maximum of the light beam in the track direction.

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