Optical pick-up apparatus

Details Optical pick-up apparatus Optical pick-up apparatus

1997-12-05

1999-11-30

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369103, G11B 700

Patent

active

059954760

ABSTRACT:
An optical pick-up apparatus comprising an optical modular device having two light sources for emitting light beams of different power levels, a photo-refractive crystal device disposed on the optical modular device and a recording medium for coupling the powers of the light beams emitted from the two light sources, and an objective lens disposed on the optical path between the photo-refractive crystal device and the recording medium for focusing the light beam emitted from the light sources on the recording medium. The optical modular device is comprised of a substrate, a mount installed on the substrate, first and second light sources installed on opposing sides of the mount, a photo-detector installed on the mount for receiving a light beam which is reflected from a recording medium, a housing having an opening in the upper portion thereof and incorporated on the upper surface of the substrate, an optical path changing unit installed at the opening of the housing for changing the path of an incident light beam.

REFERENCES:
patent: 5513164 (1996-04-01), Tanaka et al.

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