Tracking control with two servoloops for use in optical disc pla

Details Tracking control with two servoloops for use in optical disc pla Tracking control with two servoloops for use in optical disc pla

1985-05-23

1987-10-13

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 46, G11B 700

Patent

active

047003340

ABSTRACT:
A tracking control arrangement for use in an optical disc player comprises a photodetector for receiving a light beam reflected from an optical disc on which an information signal is recorded in a record track, a signal generating circuit for generating a reproduced information signal and a tracking error signal from the output of the photodetector, and a modifier for modifying the tracking error signal in response to variations in the total quantity of light of the light beam received by the photodetector. A driving circuit drives an optical device to maintain the light beam in a proper tracking relation to the record track in response to the modified tracking error signal. A detector detects a variation in the reproduced information signal resulting from the condition in which the light beam reflected from a blank area in the record track is received by the photodetector, and a gain controller varies the gain of transmission of the modified tracking error signal from the modifier to the driver in response to a predetermined detection output of the detector.

REFERENCES:
patent: 4587644 (1986-05-01), Fujii

Affiliated with

Also associated with

Rating

Tracking control with two servoloops for use in optical disc pla does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Tracking control with two servoloops for use in optical disc pla, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tracking control with two servoloops for use in optical disc pla will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-416108