Optical pickup device

Details Optical pickup device Optical pickup device

Filed on

1996-10-28

Date issued

1998-02-03

Examiner

Nelms, David C.

Patent Class

Dynamic information storage or retrieval

SubClass

Specific detail of information handling portion of system

SubSubClass

Radiation beam modification of or by storage medium

Other Related Categories

369 4423, 369 4437, 369122, G11B 713

Type

Patent

Status

active

Patent number

057152276

Description

ABSTRACT:
An optical pickup device for irradiating a laser beam onto an optical recording medium and receiving a return light from the optical recording medium, comprising a semiconductor laser element which is formed on a semiconductor substrate and has first and second light emitting faces, a first reflection portion provided so as to confront the first light emitting face of the semiconductor laser element, a second reflection portion provided so as to provide confront the second light emitting face of the semiconductor laser element, a first photodetector for receiving a return reflection light of the laser beam which is reflected from the first reflection portion and focused on the recording medium, and a second photodetector for receiving a return reflection light of the laser beam which is reflected from the second reflection portion and focused on the recording medium. A recording signal on the recording medium and a focus error signal are detected by the first and second photodetectors.

REFERENCES:
patent: 5327415 (1994-07-01), Vettiger et al.
patent: 5446719 (1995-08-01), Yoshida et al.
patent: 5568463 (1996-10-01), Sahara et al.
patent: 5608716 (1997-03-01), Koyama et al.

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