Vibrating alert device
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United States of America Patent
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Aug 10, 2004
Grant Date -
Nov 28, 2002
app pub date -
May 23, 2002
filing date -
May 23, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vibrating alert device not startling the user by its vibration and able to improve the effectiveness of the alert, provided with a vibration strength control circuit becoming active for a duration of an incoming call signal and repeatedly gradually increasing a drive voltage supplied to the vibrating motor in stages from a minimum vibration strength voltage to a maximum vibration strength voltage, the vibration control circuit having a resistance type voltage division circuit which generates different vibration strength voltages from a minimum voltage strength voltage to a maximum voltage strength and a voltage switching circuit for selecting and outputting in a rising order the vibration strength voltages for each constant time.
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