Indicating charging state of handheld electric appliance
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United States of America Patent
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Jun 12, 2012
Grant Date -
Feb 11, 2010
app pub date -
Aug 8, 2007
filing date -
Aug 14, 2006
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In one aspect, a handheld electric appliance includes: an oscillating electric motor or linear motor controlled by control circuitry; a battery connected to the oscillating electric or linear motor; and charge detection circuitry configured to determine a charging state of the battery. The charge detection circuitry is coupled to the control circuitry such that, in response to the charge detection circuitry determining that the charging state of the battery reaches a predetermined threshold, the control circuitry activates the oscillating electric motor or linear motor to cause noise generated by the motor to perceptibly change to indicate a threshold charging state.
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