Optical pickup and optical disc drive

Details Optical pickup and optical disc drive Optical pickup and optical disc drive

2006-08-22

2010-02-02

Edun, Muhammad N. (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112260, C369S110010, C369S044110

Reexamination Certificate

active

07656771

ABSTRACT:
An optical pickup for writing information to and/or for reading information from an optical disc having at least two recording layers (dual layer) provided with first and second recording layers can prevent layer crosstalk resulting from disturbing a signal reproduced from the first recording layer by a reflected light beam reflected from the second recording layer during a writing operation for writing information to the first recording layer or a reading operation for reading information from the fist recording layer. An orthogonal polarization region forming component forms an orthogonal polarization region, in which respective directions of polarization of a first light beam focused on and reflected by a first recording layer of an optical disc and a second light beam reflected by a second recording layer of the optical disc are perpendicular to each other, in a region, in which the first and the second light beam overlap each other, on a light-receiving surface of a detector. The orthogonal polarization region forming component is a polarization switch for changing the directions of polarization of part or all of the first and the second light beam.

REFERENCES:
patent: 5917798 (1999-06-01), Horimai et al.
patent: 6195315 (2001-02-01), Takahashi et al.
patent: 2004/0252612 (2004-12-01), Yamasaki et al.
patent: 2005/0219988 (2005-10-01), Atarashi et al.
patent: 2005/0249062 (2005-11-01), Abe
patent: 2005-203090 (2005-07-01), None
China Intellectual Property Office (SIPO) office action for SIPO patent application CN2006-101265202 (Aug. 8, 2008).

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