Optical pickup using three beam tracking method

Details Optical pickup using three beam tracking method Optical pickup using three beam tracking method

1995-04-26

1997-02-25

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369119, 369120, 369 4437, 369 4413, 2502015, G11B 700

Patent

active

056065426

ABSTRACT:
In an optical pickup using a three beam tracking method a laser light source generates laser beams of a main beam for reading out data from a data recording medium, a movable first guide beam and a movable second guide beam. These three pre-separated laser beams are incident upon the data recording medium and then reflected therefrom. The beam passes through a lens group to read out information recorded in the data recording medium. A light-receiving element receives a part of the reflected beam from the data recording medium for detecting tracking errors. According to this optical pickup having the laser light source generating three separated laser beams, when an azimuth angle in the three beam tracking method changes continuously, phases of the first and the second guide beam with respect to the track are maintained constantly, so that an amplitude of the tracking error signal can be maintained uniformly.

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patent: 5479387 (1995-12-01), Ando et al.

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