Optical recording medium with prepit regions and...

Details Optical recording medium with prepit regions and... Optical recording medium with prepit regions and...

2005-11-15

2005-11-15

Dinh, Tan (Department: 2653)

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

C369S275400

Reexamination Certificate

active

06965545

ABSTRACT:
An information recording medium for reproducing information by irradiation with a laser beam condensed by an objective lens with a numerical aperture NA includes a disk-shaped substrate and a recording layer disposed on the substrate. On the surface of the substrate, a plurality of prepit regions and a plurality of data regions are disposed alternately along spiral or concentric virtual track centers. Each prepit region includes a pair of wobble pits for tracking servo, and a length L (μm) of the wobble pit along the virtual track center, a wavelength λ (μm) of the laser beam, and a numerical aperture NA satisfy a relationship: 0.3≦L. NA/λ≦0.65.

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