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Browse Prior Art Database

Vibrating Capacitor

IP.com Disclosure Number: IPCOM000096868D
Original Publication Date: 1963-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Keyes, DW: AUTHOR

Abstract

The left-hand drawing shows an electromagnetic transducer. This utilizes the magnetic motion produced by barium-titanate to vary the capacitance of a composite capacitor. This includes three plates 11, 12 and 13. The barium-titanate is in the form of a diaphragm 14. A fourth metal plate 15 is positioned on top of diaphragm 14. The various segments are held by three ceramic elements 17, 18 and 19. Potential is applied to diaphragm 14 by input wires 7 and 8. Signals on wires 7 and 8 cause diaphragm 14 to vibrate to change the capacitance between plate 13 and plates 11 and 12.

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Vibrating Capacitor

The left-hand drawing shows an electromagnetic transducer. This utilizes the magnetic motion produced by barium-titanate to vary the capacitance of a composite capacitor. This includes three plates 11, 12 and 13. The barium- titanate is in the form of a diaphragm 14. A fourth metal plate 15 is positioned on top of diaphragm 14. The various segments are held by three ceramic elements 17, 18 and 19. Potential is applied to diaphragm 14 by input wires 7 and 8. Signals on wires 7 and 8 cause diaphragm 14 to vibrate to change the capacitance between plate 13 and plates 11 and 12.

The right-hand drawing shows a circuit in which the transducer is used to modulate a low level DC signal before applying a signal to differential amplifier
21. The transducer at the left is shown at the right diagrammatically as element
23. This essentially changes the capacitance between ground and points 31 and
32.

The low level signal is applied between input points 33 and 34. Points 33 and 34 are connected to amplifier 21 through resistors 41 and capacitors 42. An AC signal is applied to points 7 and 8 changing the capacitance between ground and points 31 and 32. This modulates the signal applied to terminals 33 and 34 at the frequency of the signal applied at the terminals 7 and 8.

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