Digitally controlled positioning system for quickly moving and t

Details Digitally controlled positioning system for quickly moving and t Digitally controlled positioning system for quickly moving and t

1988-02-04

1989-10-24

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

048766798

ABSTRACT:
A positioning system having a velocity feedback loop for positioning an object has two modes--a high speed moving mode and a fine positional resolution moving mode. The system requires a wide range in the high speed moving mode and a high resolution in the fine positional resolution moving mode. To satisfy these inconsistent requirements, the gain of a velocity sensor in the feedback loop is varied according to the mode. The gain is decreased in the high speed moving mode, and increased in the fine positional resolution moving mode. This system may be effectively used to control an optical head of an optical disc player.

REFERENCES:
patent: 4463300 (1984-07-01), Mayne et al.
patent: 4627039 (1986-12-01), Meyer

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