Electrically driven oscillating capacitor device

Details Electrically driven oscillating capacitor device Electrically driven oscillating capacitor device

1977-03-21

1978-07-11

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310321, 361289, H01L 4110

Patent

active

041004426

ABSTRACT:
A spring member is resin bonded to a piezoelectric material body at one end nd at the other end carries the oscillating electrode of a Kelvin probe capacitor used for electron work function measurement under vacuum. The piezoelectric material body can be either a piezoelectric crystal or a piezoceramic. An alternating voltage causes it to vibrate the spring member at a resonant frequency, so that a still greater amplitude of vibration is produced at the electrode. A superimposed d-c voltage is applied to the piezoelectric material body to set the average spacing between the movable reference electrode and the fixed sample electrode. A polyurethane-based resin provides vacuum-proof bonding. The piezoelectric material body and spring are mounted in a tube providing electrostatic shielding. The electrical circuits for a-c excitation and for synchronous detection of displacement currents resulting from differences in contact potential of the respective electrode materials are all located outside the vacuum chamber.

REFERENCES:
patent: 1900038 (1933-03-01), Bower
patent: 2368643 (1945-02-01), Crosby
patent: 2682623 (1954-06-01), Woodyard et al.
patent: 2937562 (1960-05-01), Robillard
patent: 2983902 (1961-05-01), Philipps
patent: 3117440 (1964-01-01), Wilner
patent: 3336529 (1967-08-01), Tygart
patent: 3501745 (1970-03-01), Beckman
patent: 3646413 (1972-02-01), Oomen

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