Optical pickup apparatus using plural laser sources of different

Details Optical pickup apparatus using plural laser sources of different Optical pickup apparatus using plural laser sources of different

1989-11-27

1992-03-03

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

G11B 700

Patent

active

050938215

ABSTRACT:
An optical pickup apparatus having plural light sources which emit laser lights of different wavelengths, a first optical system section for converging and irradiating as light spots the emitted laser lights on a recording medium, a second optical system section for leading the reflected lights on a single optical path of the laser lights, a focusing lens for converging the reflected lights in different focuses according to their respective wavelengths on a single optical axis.

REFERENCES:
patent: 4090031 (1978-05-01), Russell
patent: 4680745 (1987-07-01), Ota et al.
patent: 4888755 (1989-12-01), Itoh

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