Keyboard device and a method of controlling a power supply incorporated in the keyboard device
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United States of America Patent
Stats
-
Apr 6, 2004
Grant Date -
Jul 26, 2001
app pub date -
Jan 18, 2001
filing date -
Jan 21, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A keyboard device incorporating a power supply checks whether or not the power supply is turned on. If it is, the device determines whether or not the device is connected to a cellular phone. If the connection is determined, the keyboard device is set to an active state and a light emitting diode (LED) in an LED portion is turned on to indicate the active state. If the keyboard device is not connected to the cellular phone, the device is set to a standby state. In this state, the keyboard device is in a mode where a connection state with respect to a cellular phone is monitored, without turning on the LED. The power dissipated in the power supply of the keyboard device is minimized, thus the device is capable of operating for a long period of time.
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