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Browse Prior Art Database

ELECTRONICALLY TUNABLE TUNING FORK

IP.com Disclosure Number: IPCOM000026678D
Original Publication Date: 1993-Apr-30
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 92K

Publishing Venue

Xerox Disclosure Journal

Abstract

In the production of tuning forks, the adjustments required to resonate them are often reiterive, time consuming and costly. One operation that is commonly used involves the removal or addition of mass to both tines. A similar operation is employed to balance the fork for purposes of increasing its Q (figure of merit).

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XEROX DISCLOSURE JOURNAL

ELECTRONICALLY TUNABLE TUNING FORK
Lloyd F. Bean

Proposed Classification
U.S. C1.310/15 Int. C1. H02k 33/00

10

14

XEROX DISCLOSURE JOURNAL - Vol. 18, No. 2 MarcWAprill993 133

[This page contains 1 picture or other non-text object]

Page 2 of 2

ELECTRONICALLY TUNABLE TUNING FORK (Cont'd)

In the production of tuning forks, the adjustments required to resonate them are often reiterive, time consuming and costly. One operation that is commonly used involves the removal or addition of mass to both tines. A similar operation is employed to balance the fork for purposes of increasing its Q (figure of merit).

Disclosed herein are the methods for dynamically adjusting the fundamental frequency and the balancing of a tuning fork without the need for secondary manufacturing operations.

This disclosure is illustrated in the accompanying figure. As shown, a separate tuning element 14 and a piezoelectric drive 12 are mounted to each tine of a tuning fork 10. In the main embodiment of the disclosure, a pair of bimorph members are used for the tuning elements 14.

The process to dynamically adjust the fundamental frequency of tuning fork 10 is accomplished by: 1) applying an AC electrical signal, of the desired frequency, to piezoelectric drive members 12, and 2) applying the appropriate electrical excitation to tuning elements 14 to move the center of mass of member 14 up or down to correspondingly increase or decrease the fork's natural resonant frequenc...