Communications: electrical – Selective – Having indication or alarm
Reexamination Certificate
2011-05-03
2011-05-03
Zimmerman, Brian A (Department: 2612)
Communications: electrical
Selective
Having indication or alarm
C340S007100
Reexamination Certificate
active
07936251
ABSTRACT:
In a notifying device comprising a notifying unit2having incorporated therein a vibrator to be resonated by a drive signal fed thereto, and a signal preparing circuit5for feeding the drive signal to the notifying unit2, the signal preparing circuit5prepares a drive signal Dv varying in frequency within a predetermined range including the resonance frequency of the vibrator of the unit2and feeds the signal to the notifying unit2. The variation of frequency of the drive signal is determined in correspond relation with a variation in the resonance frequency of the vibrator due to tolerances for specifications which govern the resonance frequency. The drive signal has an alternating waveform of rectangular waves or sine waves, and the frequency thereof varies periodically from 1.37 to 2.98 Hz. The notifying device achieves a satisfactory notifying effect despite the variation of the resonance frequency of the vibrator.
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Genno Hirokazu
Hamaguchi Toshihide
Edwards Angell Palmer & & Dodge LLP
Kyocera Corporation
Zimmerman Brian A
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