Variable frequency vibratory alert method and structure
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United States of America Patent
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-
Jul 25, 1995
Grant Date -
N/A
app pub date -
Jul 6, 1993
filing date -
Jul 6, 1993
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A portable vibratory alerting device (20) is part of a resonant system (20, 30) and has a resonant vibrator (60) for both generating a vibrational alert and sensing the resonant frequency of the resonant system. The vibrator (60) is driven by a variable frequency driver (76, 78), and thereafter the resonant frequency is measured by a sensor (82). A vibration controller (72) causes the frequency of the vibrator to be substantially equal to the resonant frequency of the system. Alternately, a portable alerting device (520) has both a vibrator (160) and a sensor (166) for sensing the amplitude of a vibratory alert at various frequencies. A vibration controller (72) generates a vibratory alert at an optimum frequency in response to the sensed amplitudes.
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