Optical system for a magneto-optical recording/reproducing appar

Details Optical system for a magneto-optical recording/reproducing appar Optical system for a magneto-optical recording/reproducing appar

1993-11-12

1995-04-11

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369110, 369112, 2502015, G11B 1304, G11B 1112

Patent

active

054065321

ABSTRACT:
A system for a magneto-optical information recording/reproducing system has a polarizing beam splitter for splitting a light beam reflected by a magneto-optical disk, which utilizes the Kerr effect, into one light beam for detecting focussing errors and two light beams for detecting tracking errors. The polarizing beam splitter operates to split a polarizing light beam in such a manner that the two light beams for detecting tracking errors have a polarizing beam composition that is perpendicular to the polarizing beam composition of the light beam for detecting focussing errors. The optical system includes a light receiving element for receiving the light beam split by the beam splitter. The light receiving element has a light receiving portion for detecting focussing errors and a light receiving element for detecting tracking errors. The light receiving portion for detecting focussing errors has a plurality of light receiving areas for receiving the light beam for detecting focussing errors. The light receiving portion for detecting tracking errors is provided with a pair of light receiving areas for receiving the two light beams for detecting tracking errors, the pair of light receiving areas being positioned to sandwich the light receiving portion for detecting focussing errors.

REFERENCES:
patent: 4689781 (1987-08-01), Ando
patent: 4737946 (1988-04-01), Yamashita et al.
patent: 4797868 (1989-01-01), Ando
patent: 4817074 (1989-03-01), Yamanaka
patent: 4868377 (1989-09-01), Nishikawa
patent: 4954702 (1990-09-01), Kurogama
patent: 4984225 (1991-01-01), Ando

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