Optical pickup device

Details Optical pickup device Optical pickup device

1995-09-07

1997-09-23

Edun, Muhammad N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369110, 369 13, 369 4414, 369 4437, G11B 700

Patent

active

056712065

ABSTRACT:
An optical pickup device for recording/reproducing an optical disc having at least two data storing layers on one side thereof generates a first and second laser beams of same polarization (S-polarized beams) from a first and second laser beam sources. The laser beams are incident on a prism of a cubic type in which a dielectric coating layer for selectively total reflecting or total transmitting depending to a polarizing state of an incident beam is formed at a diagonal surface (45.degree.) of the prism. Instead of the prism of the cubic type, only a dielectric coating plate may be positioned at the diagonal surface of the prism. The first S-polarized beams is total reflected by the dielectric coating layer for reading out information recorded on a first layer of the optical disc. The second S-polarized beams is total reflected toward a polarization converting plate, and thus the beam is converted into P-polarized light to return to the prism. The P-polarized beams is total transmitted through the dielectric coating layer for reading out information recorded on a second layer of the optical disc.

REFERENCES:
patent: 4905214 (1990-02-01), Nagashima
patent: 5408453 (1995-04-01), Holtslag et al.

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