Optical head having beam splitting surface curved to present a s

Details Optical head having beam splitting surface curved to present a s Optical head having beam splitting surface curved to present a s

1995-05-30

1997-05-06

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369110, 369112, G11B 709

Patent

active

056278063

ABSTRACT:
An optical head for recording and reproducing information on and from an opto-magnetic record medium by projecting a light beam onto the record medium and introducing a return light beam reflected by the record medium onto photodetectors, including a light source for emitting a linearly polarized light beam, an objective lens for projection the light beam onto the record medium, and an optical element having a surface on which a beam splitting surface is provided in the diverging or converging return beam. Said beam splitting surface is curved such that light rays of the return light beam are made incident upon the beam splitting surface at substantially the same incident angle, so that the return light beam can be split accurately into P-polarized and S-polarized light beams.

REFERENCES:
patent: 5029255 (1991-07-01), Opheij et al.
patent: 5060217 (1991-10-01), Kume
patent: 5198916 (1993-03-01), Kim
patent: 5436876 (1995-07-01), Yokoyama et al.

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