Optical pickup with a double refraction polarizing plate to spli

Details Optical pickup with a double refraction polarizing plate to spli Optical pickup with a double refraction polarizing plate to spli

1994-11-25

1996-10-29

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4437, 369107, 369112, G11B 700

Patent

active

055703348

ABSTRACT:
An optical pickup apparatus to produce two polarized beams to be irradiated onto a given track of a recording medium with neighboring each other. The optical pickup apparatus includes a laser light source for generating beams irradiated on a recording medium, a beam splitter for reflecting beams vertically and for transmitting the beam reflected from the recording medium, a double refraction polarization means for separating the beams into first and second polarized beams and for transmitting a reflected first and second polarized beams so as to have a same beam path, a polarization been splitter for reflecting the reflected first polarized beam passing and for transmitting the reflected second polarized beam, and at least one photodetecting means for separately receiving the reflected first and second polarized beams. The optical pickup apparatus is able to reduce detection errors resulting from some defects made on the surface of the recording medium. Further, a serial current and noise can be reduced and the number of the components of the optical pickup apparatus may be reduced to lower the production cost.

REFERENCES:
patent: 5128914 (1992-07-01), Kurata et al.
patent: 5153863 (1992-10-01), Noda et al.
patent: 5155717 (1992-10-01), Bakx
patent: 5383169 (1995-01-01), Shinoda et al.
patent: 5434841 (1995-07-01), Nishikawa
patent: 5471455 (1995-11-01), Jabr

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