Oscillators – Electromechanical resonator
Reexamination Certificate
2006-04-18
2006-04-18
Mis, David (Department: 2817)
Oscillators
Electromechanical resonator
C331S155000, C331S176000, C331S183000, C310S036000, C359S199200, C359S225100
Reexamination Certificate
active
07030708
ABSTRACT:
A torsion oscillator (FIG.1) is stabilized in operation by determining the current resonant frequency (62); in a first procedure, observing the oscillator for change in resonant frequency (64), and then restoring the amplitude and median offset (66) without changing the drive frequency. In an alternative procedure, after determining the resonant frequency (62); setting the drive frequency close to but offset from the current resonant frequency (74), observing the oscillator for change in resonant frequency (76), and the restoring the close offset to the changed resonant frequency (78). By operating slightly off peak, the direction of resonant change is immediately known. The first procedure has less difficulties in implementation, but requires more power.
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Texas Instruments Product Review, Multi-Topology Piezoelectric Transformer Controller, Nov. 2001, p. 1-27 and page headed “Important Notice”.
Lexmark International Inc.
Luedeka Neely & Graham P.C.
Mis David
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