Optical pick-up device for optical disc player

Details Optical pick-up device for optical disc player Optical pick-up device for optical disc player

1992-08-18

1994-05-24

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4426, 369100, G11B 709

Patent

active

053155769

ABSTRACT:
An optical pick-up device of an optical disc player comprsing a laser source part for generating a laser beam and for scanning the laser beam as a beam spot having a predetermined size, a beam deflecting part for receiving the laser beam scanned by the laser source part and for deflecting the laser beam so as to cause the laser beam to be scanned to a desired access position of an optical disc. The beam deflecting part utilizes an acoustooptic deflector and an acoustooptic deflector control member for controlling the ultrasonic frequency, in response to a feedback signal, which in turn corresponds to the desired access position of the optical disc. Further, a beam scanning part for causing the laser beam scanned by the beam deflecting part to become a minute beam spot, which is in turn scanned to the optical disc on the turntable, and for separating the retrace laser beam reflected by the optical disc by reflecting the retrace laser beam, and an optical detector for receiving the laser beam, which has been reflected by the optical disc and separated and reflected by the beam scanning part, and for detecting the laser beam so as to output electric signals corresponding to the detected laser beam. The optical pick-up device does not require a conventional servo mechanism, thereby accomplishing the compactness of the construction, permitting the tracking accuracy to be improved irrespective of the outside vibration and reducing the access time.

REFERENCES:
patent: 4888757 (1989-12-01), Fujita
patent: 4999826 (1991-03-01), Fujita
patent: 5043965 (1991-08-01), Iida et al.
patent: 5068845 (1991-11-01), Yagi
patent: 5128693 (1992-07-01), Tatemichi et al.
patent: 5157650 (1992-10-01), Ozue et al.

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