Optical information recording and reproducing apparatus includin

Details Optical information recording and reproducing apparatus includin Optical information recording and reproducing apparatus includin

1995-11-09

1997-08-12

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

368112, 368107, 368118, G11B 700

Patent

active

056573057

ABSTRACT:
An optical head for an opto-magnetic information recording and reproducing apparatus having stable characteristics. The optical head has a forward path optical system including a polarization beam splitter for reflecting a linearly-polarized light beam in the form of a divergent light beam from a light source, and an objective of a finite imaging system for converging the reflected light beam on an opto-magnetic recording medium, and a backward path optical system in which the reflected light beam from the recording medium is converged by the finite-imaging objective, and in which the converged light beam passes through the polarization beam splitter and is further reflected by a total reflection surface for reflecting this light beam to be led to detection means. A phase difference created in the convergent light beam when the light beam passes through a polarized light separating surface of the polarization beam splitter is compensated for by the total reflection surface.

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