Focusing adjustment of an optical pickup

Details Focusing adjustment of an optical pickup Focusing adjustment of an optical pickup

1999-01-22

2000-05-30

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4414, 369 4432, 369 4441, 369103, G11B 713

Patent

active

060698632

ABSTRACT:
An optical pickup includes a diffraction element for causing diffraction in a reflection beam from a disc. This diffraction element is divided into two of first and second regions. On four light receiving elements are converged respectively a first reflection beam from a first region and a second reflection light from a second region. A switch performs switching-over between four output signals individually taken from four light receiving elements and three output signals in total taken out by adding together two output signals of four output signals.

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European Search Report, EP 99 10 1265, Jun. 9, 1999.

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