Optical system for optical information recording/reproducing app

Details Optical system for optical information recording/reproducing app Optical system for optical information recording/reproducing app

1991-10-28

1997-04-01

Shafer, Ricky D.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4424, 369110, 369112, 359494, 359495, 2502015, G11B 700, G02B 530

Patent

active

056173873

ABSTRACT:
In an optical system comprising a light source section consisting of a semiconductor laser and a collimator lens, an objective lens for focusing a light beam on an optical disk, a beam splitter for separating part of the light beam reflected from the optical disk, a condenser lens, and a photosensor for detecting the separated light beam to produce a focusing and a tracking error signal, a plane parallel plate is provided between the light source section and the beam splitter. By rotating the plane parallel plate with an adjusting mechanism, the light beam undergoes a parallel shift, so that the intensity distribution of light being incident on the objective lens is varied and a tracking offset due to a deviation of the optical axis of the output light from the light source section can be compensated for. The plane parallel plate may be disposed between the beam splitter and the condenser lens.

REFERENCES:
patent: 4689781 (1987-08-01), Ando
patent: 4805992 (1989-02-01), Maeda
patent: 4812638 (1989-03-01), Ogata et al.
patent: 4841510 (1989-06-01), Yoshizawa
patent: 4862446 (1989-08-01), Malda
patent: 4868377 (1989-09-01), Nishikawa
patent: 4873678 (1989-10-01), Nakamura et al.

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