Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1976-04-19
1977-11-01
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310330, H01L 4104
Patent
active
040567419
ABSTRACT:
A ceramic crystal transducer is connected to a direct current supply in series with a pair of transistors. A pair of independent multivibrator oscillators are connected, each controlling one of the transistors. Each oscillator establishes a rectangular wave and is provided with a continuously adjustable resistor for controlling the output frequency of the corresponding oscillator. The one oscillator is constructed to produce a frequency and a voltage to excite the crystal at the order of the natural resonant frequency and to thereby produce an audio output signal. The second multivibrator oscillator selectively controls the second transistor to control the on/off or pulsing rate of the tone related audible signal. The crystal is pulsed at the output rate of the tone oscillator and vibrates at the fundamental frequency of the rectangular wave as well as harmonics to either side of such fundamental frequency to produce a full and pleasant sound. Variation of the repetition rate of the output signal of the tone generator to either side of the natural resonant frequency of the crystal correspondingly varies the pitch and intensity of the emitted sound to distinguish adjacent alarms. The pulse rate oscillator permits further distinction by adjustment of the signal duty cycle.
REFERENCES:
patent: 3271596 (1966-09-01), Brinkerhoff
patent: 3331970 (1967-07-01), Dundon et al.
patent: 3577020 (1971-05-01), Carlson
patent: 3708702 (1973-01-01), Brunnert et al.
patent: 3860838 (1975-01-01), Kumon
Hoerz Richard D.
Propp Donald J.
Airco, Inc.
Bopp Edmund W.
Budd Mark O.
Rae David L.
Rathbun Roger M.
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