Optical recording medium and optical pickup device

Details Optical recording medium and optical pickup device Optical recording medium and optical pickup device

2005-08-16

2005-08-16

Huber, Paul W. (Department: 2653)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S121000

Reexamination Certificate

active

06930976

ABSTRACT:
An optical recording medium is arranged such that respective information recorded on lands and grooves are reproducible by either of a light beam of a first wavelength λ1and a light beam of a second wavelength λ2which is shorter than the first wavelength λ1. The groove depth d of the optical recording medium is such that tracking error signals of not less than a predetermined level can be ensured for respective wavelengths λ1and λ2without generating distortion in waveform, irrespectively of differences in receiving light sensitivity of a photodetector provided in a optical pickup devices for use in recording and reproducing information on and from such optical recording medium.

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