Accessing apparatus for optical information recording and reprod

Details Accessing apparatus for optical information recording and reprod Accessing apparatus for optical information recording and reprod

1990-10-04

1992-03-10

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

050954741

ABSTRACT:
The accessing apparatus, which is to be used for an optical information recording and reproducing apparatus, controls the speed of a light spot and accesses the light spot to an object track. The apparatus includes a speed instructing device for outputting a speed instructing signal instructing the moving speed of the light spot when accessing the light spot to the object track. A track error signal detecting device detects a track error signal showing a position difference between the light spot and the track. A speed detecting device detects a speed detecting signal showing the relative speed between the light spot and the track by using the track error signal. An operating device operates the speed error signal based on the speed instructing signal and speed detecting signal. A driving device moves the light spot for the track based on the speed error signal to access the light spot to the object track by controlling the speed of the light spot. A regulating device regulates the signal from the speed detecting device to the driving device so that the speed detecting signal exceeding a predetermined range may not be used for speed control of the light spot by the driving device.

REFERENCES:
patent: 4745587 (1988-05-01), Maeda
patent: 4764911 (1988-08-01), Morota et al.
patent: 4835752 (1989-05-01), Nakatsu et al.
patent: 4931889 (1990-06-01), Osafune
patent: 4955009 (1990-09-01), Nakatsu et al.

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