Optical head including a halfwave plate and a monaxial crystal f

Details Optical head including a halfwave plate and a monaxial crystal f Optical head including a halfwave plate and a monaxial crystal f

1995-04-26

1996-06-18

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369110, 369116, 369 4423, G11B 712

Patent

active

055285767

ABSTRACT:
An optical head for use in a magnetooptical record/reproducing apparatus includes a light source emitting a linearly polarized light beam guided to a polarized direction rotating element to rotate the polarized direction of the light beam. The light beam emerging from the polarized direction rotating element is split into two light beams by a light beam splitting device which has a monoaxial crystal and which is adapted to split the incident light beam into two light beams with mutually perpendicular polarized directions. The light beam is converged onto a medium and the light beam returned from the medium is detected. The polarized direction of the light beam emitted from the light source coincides with the direction of the crystal axis of the monoaxial crystal. The polarized direction of the light beam emitted from the light source is so positioned as not to form an angle with respect to the longitudinal direction or perpendicular direction of information tracks of the medium.

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