Optical pickup device with diffraction patterns on object lens

Details Optical pickup device with diffraction patterns on object lens Optical pickup device with diffraction patterns on object lens

2011-08-02

2011-08-02

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112030, C369S112060, C369S112080

Reexamination Certificate

active

07990833

ABSTRACT:
An optical pickup device, which reduces the size of an optical spot formed on an optical disk, and prevents the degradation of a tracking error signal due to coherent light from a layer adjacent a target recording/reproducing layer of the optical disk. The optical pickup device includes a light source emitting light at a designated wavelength; an object lens concentrating the light incident from the light source thereupon and forming an optical spot on an optical disk having multiple recording layers; and an optical detector receiving the light reflected by the optical disk and detecting a data signal and an error signal, wherein at least one diffraction pattern region partially diffracting or intercepting the light, emitted from the light source and being incident upon the object lens, and the light, reflected by optical disk and being incident upon the object lens, is formed on the object lens.

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patent: 2005/0030878 (2005-02-01), Park et al.
patent: 2005/0161579 (2005-07-01), Kim et al.
patent: 2006/0072387 (2006-04-01), Schleipen
patent: 2009/0016195 (2009-01-01), Arai et al.
patent: 10-312573 (1998-11-01), None
patent: 2005-74839 (2005-07-01), None

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