Optical pickup device and recording medium used therefor

Details Optical pickup device and recording medium used therefor Optical pickup device and recording medium used therefor

2006-07-04

2006-07-04

Edun, Muhammad (Department: 2656)

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C369S275100, C369S053200

Reexamination Certificate

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07072254

ABSTRACT:
An optical pickup device includes a light unit for irradiating a light beam having a wavelength longer than 650 nm onto a recording medium and receiving and detecting a light beam reflected by the recording medium, and an objective tens formed of a single lens having an NA of 0.7 or more to form a light spot on the recording medium by condensing an incident light beam emitted from the light unit. A recording medium has a recording density of a DVD family or more and is formed of a material suitable for a long wavelength of 700 nm or more so that a reproduction signal by a reflectance of a recording surface is optimized. Thus, a compact high density optical recording/reproducing apparatus which is inexpensive and has high performance can be realized.

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patent: 2002/0172133 (2002-11-01), Kim et al.
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patent: 2000-331374 (2000-11-01), None
patent: PCT/JP95/00374 (1995-03-01), None

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