Optical pickup device for optical recording/playback apparatus

Details Optical pickup device for optical recording/playback apparatus Optical pickup device for optical recording/playback apparatus

1990-06-19

1992-10-20

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, G11B 700

Patent

active

051576490

ABSTRACT:
An optical pickup device used in an optomagnetic disk recording/playback apparatus, comprises a light emitting element such as a semiconductor laser for producing a light for recording information onto a recording medium and playing back the information from the medium; a parallel light generating element such as a collimator lens for changing the light from the light emitting element to a parallel light; a beam shaping element for shaping the parallel light into a substantially circular shape in cross section; a beam splitter for dividing the circular beam from the beam shaping element; a light beam receiving element for receiving a divided beam reflected on a splitting plane of the beam splitter; and a polarized plane change element such as half-wave plate provided at a predetermined position of an optical system between the light emitting element and the beam splitter, for changing a plane of polarization of light passing through by a predetermined angle.

REFERENCES:
patent: 4333173 (1982-06-01), Yonezawa et al.
patent: 4779250 (1988-10-01), Kogure et al.
patent: 4833662 (1989-05-01), Yoda
patent: 4837758 (1989-06-01), Motoyama et al.
patent: 4985880 (1991-01-01), Yoshida et al.

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