Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1982-02-17
1984-02-14
McElheny, Jr., Donald
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 32, G11B 700
Patent
active
044320833
ABSTRACT:
A high density optical storage system employing a laser beam for reading data in a track on a rotating optical disk containing a large number of concentric tracks. Track following is provided using a galvanometer-controlled mirror in the path of the beam which is angularly deflected during track following in response to detected track deviations, whereby the beam is controlled to accurately follow the track. Provision is also made for detecting the angular position of the mirror. A linear motor responsive to the detected angular position moves the mirror in a direction which reduces the deflection required to be provided by the mirror in order to maintain the beam accurately following the track. The mirror is also controlled in response to the rate of change of the linear motor velocity for providing greater system stability.
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Paul M. Trethewey, "An Infra-Red Based Beam Scanner Position Sensor", Wescon Electronic Show & Convention, Sep. 15-17, 1981, Brooks Hall & Civic Auditorium, Hilton Hotel, San Francisco, California, Region 6, IEEE Student Paper Competition, pp. 1-8.
Hsieh Der-Chang
LaBudde Edward V.
Burroughs Corporation
Cass Nathan
McElheny Jr. Donald
Peterson Kevin R.
Rasmussen David G.
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