Optical pickup device

Details Optical pickup device Optical pickup device

1995-09-07

1997-07-08

Edun, Muhammad N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4412, 369 4437, G11B 7135

Patent

active

056469292

ABSTRACT:
An optical pickup device for recording/reproducing an optical disc having at least two data storing layers on one side thereof generates laser beams having different wavelengths from two laser beam sources. The laser beams are incident to a cubic prism in the form of combining four triangular bar prisms for selectively transmitting or reflecting respective laser beams through or from respective combining planes according to the wavelengths. The incident beam is curved by the cubic prism at the right angle to be incident to the optical disc, and then incident to the cubic prism by which the beam is cut by half to be received into a two division photodetector, thereby controlling focusing and tracking of the laser beams.

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

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