Communications: electrical – Audible indication – Ultrasonic pest control
Patent
1981-09-29
1984-12-04
Swann, III, Glen R.
Communications: electrical
Audible indication
Ultrasonic pest control
310324, 340388, G08B 300
Patent
active
044867425
ABSTRACT:
A multifrequency piezoelectric sound-generating system is provided with a piezoelectric vibrator for generating audible sound at two or more resonance frequencies, an oscillator circuit connected to the piezoelectric vibrator for oscillating at one of the resonance frequencies, and a modulator circuit connected to the oscillator circuit for amplitude-modulating the oscillator circuit with a modulating frequency substantially equal or close to a frequency separation between the resonance frequencies to energize the piezoelectric vibrator with frequency-modulated waves to generate multifrequency audible sound.
The modulator circuit may have a frequency divider that is operative in response to an oscillating frequency in the oscillator circuit for dividing or counting down the oscillating frequency into the modulating frequency to modulate the oscillator circuit therewith. The piezoelectric vibrator may include a diaphragm, a generally rectangular metal sheet which is smaller in size than the diaphragm and mounted on the diaphragm, and a sheet of a piezoelectric material mounted on the metal sheet.
REFERENCES:
patent: 4104628 (1978-08-01), Sweany et al.
patent: 4139842 (1979-02-01), Fujita et al.
patent: 4159472 (1979-06-01), Murakami et al.
Fukami Tatsuo
Hayashibe Rinpei
Kudo Michio
Marukokeihouki Co. Ltd.
Swann III Glen R.
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