Optical memory system having track following and seeking capabil

Details Optical memory system having track following and seeking capabil Optical memory system having track following and seeking capabil

1982-02-17

1984-03-06

McElheny, Jr., Donald

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 44, G11B 700

Patent

active

044357974

ABSTRACT:
A high density optical data storage system employing a laser beam for reading data in a track on a rotating optical disk containing a large number of closely spaced concentric tracks. The system provides for track following as well as long and short seek track moving operations. Track following and short seeking operations share the use of a galvanometer-controlled mirror in the path of the beam, while long seek operations are performed using a positioning motor which is also used during track following to reduce the deflection required to be provided by the galvanometer mirror. The short seek operation uses a specially shaped doublet waveform comprised of opposite polarity pulses chosen based on the number of tracks to be moved and the mechanical characteristics of the system.

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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.

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