Objective lens support and positioning system

Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium

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350255, 369 45, G02B 702

Patent

active

047997664

ABSTRACT:
An objective lens is affixed to a permanent magnet which in turn is affixed to an electret material having an inherent charge. A support structure for the permanent magnet is formed from an array of electromagnets which partially surround the permanent magnet. Current signals are controllably applied to the electromagnets to generate a magnetic support field for supporting the permanent magnet and its mounted objective lens. Sensors are provided for sensing the charge inherent in the electret material as a function of the position of the electret material from the sensors. The sensors provide position signals to a control device, such as a microprocessor, which control device provides current signals to the electromagnet array to position the permanent magnet and the associated objective lens at a desired position.

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IEEE Transactions on Industry Applications, vol. IA-20, No. 6, Nov./Dec. 1984, by H. Von Seggern, "Improved Surface Voltage Uniformity on Electrets Obtained by Modified Corona Charging Method", pp. 1623-1626.
J. Appl. Phys. 54(7), Jul. 1983, by A. Abazi and O. D. Jefimenko, "Forces and Torques Acting on Plane and Cylindrical Electrets in Slot-Effect Transducers", pp. 4076-4082.
J. Acoust. Soc. Am. 78(2), Aug. 1985, by I. J. Busch-Vishniac, "Optical Design of a Foil Electret Earphone for use in Telephony", pp. 398-405.

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