Optical head

Details Optical head Optical head

1993-05-14

1995-11-07

Willis, Davis L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369112, H01J 314

Patent

active

054652472

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

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