Optical pick-up and disc apparatus having the same

Details Optical pick-up and disc apparatus having the same Optical pick-up and disc apparatus having the same

2011-08-23

2011-08-23

Haley, Joseph (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S094000, C369S120000, C369S112050

Reexamination Certificate

active

08004953

ABSTRACT:
An optical pick-up and a disc apparatus having the same. The inferiority of a tracking signal caused by an adjacent layer during the recording and/or reproducing of an optical disc with multiple recording layers is effectively prevented. The optical pickup includes a light source to emit light with a predetermined wavelength, a light collecting unit to collect the light emitted from the light source to form a light spot on a signal recording layer of an optical disc having a plurality of recording layers, a photodetector to receive the light reflected by the optical disc to detect a signal, and an optical member to change the optical transmission of the light reflected by the optical disc according to an incident angle of the reflected light to decrease an optical transmission of a noise light entering the photodetector.

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Search Report issued in European Patent Application No. 07123128.6 on Oct. 15, 2008.
Korean Office Action issued Feb. 28, 2011 in KR Application No. 10-2007-0016858.

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