Communications: electrical – Land vehicle alarms or indicators – External signal light system
Patent
1991-07-02
1993-01-19
Crosland, Donnie L.
Communications: electrical
Land vehicle alarms or indicators
External signal light system
340384R, 340384E, 340326, 34081521, 310326, 310327, 310316, B60Q 126, H01L 4104
Patent
active
051810190
ABSTRACT:
A sound generating device which increases the effectiveness of the sound generated by mechanically coupling a weight to a piezoelectric element. This sound generating device may find particular application in a combination backup light and sound generating device utilized in an automotive vehicle. Also, circuitry for driving a piezoelectric element at its resonant frequency when the driving signal is applied to the piezoelectric element across a step-up transformer. The circuitry features a feedback signal which detects the frequency at which the piezoelectric element is vibrating. This feedback signal is then subjected to low-pass and high-pass filtering to remove any phase shifts resulting from applying the driving signal across the step-up transformer. This filtered feedback signal is then utilized to control the driving signal.
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Gottlieb Mark
Roche Tom
Crosland Donnie L.
Designtech International Inc.
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