Optical data recording and reproducing apparatus including optic

Details Optical data recording and reproducing apparatus including optic Optical data recording and reproducing apparatus including optic

1992-05-27

1993-02-09

Nguyen, Hoa T.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4412, 369 4414, 369 4437, 369109, G11B 7095, G11B 712

Patent

active

051857316

ABSTRACT:
An optical data recording and reproducing apparatus in which a light beam is diffracted into three light beams. The three light beams are reflected by a first surface of a plane parallel plate and applied through an objective lens to a recording medium, which forms three signal light beams. The three signal light beams are reflected back to the plane parallel plate and partially reflected by a second surface of the plate. A first optical detector detects one of the three signal light beams, which corresponds to the main light beam of the 0-th order of diffraction. A second optical detector detects a light beam of the -1st order of diffraction corresponds to the auxiliary light beam of the +1st order of diffraction and a light beam of the +1st order of diffraction corresponding to the auxiliary light beam of the -1st order of diffraction. Accordingly, the second optical detector can output a tracking error signal without interference by the main light beam.

REFERENCES:
patent: 4358200 (1982-11-01), Heemskerk et al.
patent: 4753513 (1988-06-01), Shikama
patent: 4768183 (1988-08-01), Ohnishi et al.
patent: 4817072 (1989-03-01), Toide et al.
patent: 4817074 (1989-03-01), Yamanaka
patent: 5084851 (1992-01-01), Noda et al.

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