Optical pickup device for magneto-optical disc reproducing syste

Details Optical pickup device for magneto-optical disc reproducing syste Optical pickup device for magneto-optical disc reproducing syste

1994-11-08

1996-01-30

Epps, Georgia Y.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369112, 369110, G11B 1100

Patent

active

054885922

ABSTRACT:
An optical pickup device having a simple structure due to many less components is disclosed. A laser beam generated in a laser diode is transformed into a parallel laser beam. The laser beam is irradiated onto a polarization beam splitter including a prism having a partially reflection coated layer on an oblique surface thereof, a mirror and a polarization beam splitting plane, the prism being formed at a first corner of a rectangle of a hexahedron, the mirror being formed at a second corner opposing the first corner, the polarization beam splitting plane being formed between the prism and the mirror on a line parallel with the partially reflecting coated layer, the line passing through a third corner, and the prism, the mirror and the polarization beam splitting plane being formed integrally in the hexahedron. The laser beam is irradiated onto a disc and the reflected light is split into a first polarization component and a second polarization component. The first and second polarization components are detected in a photo-detector to generate data signal. Compact optical pickup device can be manufactured. Also, the assembling work therefor is simplified to enhance the reliability of the optical pickup device.

REFERENCES:
patent: 4764912 (1988-08-01), Ando et al.
patent: 4926490 (1990-05-01), Tsuyuguchi et al.
patent: 5020041 (1991-05-01), Nakao et al.
patent: 5099470 (1992-03-01), Matsubayashi
patent: 5105399 (1992-04-01), Shimonoli
patent: 5157649 (1992-10-01), Suzuki
patent: 5337300 (1994-08-01), Takishima et al.
patent: 5404490 (1995-04-01), Matsubayashi et al.

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