Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1988-03-15
1989-01-24
Corbin, John K.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
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.
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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.
Ben Loha
Corbin John K.
Dugas Edward
Eastman Kodak Company
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