Patent ID: 6684083
Filing Date: 2004-01-27
Classification: G06K,H04W,Y02D

Abstract:
A portable information terminal for connecting to a mobile telephone set for data communications, comprising:detecting means for detecting a radio wave sent from the mobile telephone set, extracting electric energy from the detected radio wave, and generating a power supply voltage from the extracted electric energy; information processing means for processing data to be sent and received data; memory means for storing data; input means operable by the user for inputting data and commands; display means for displaying data; a main power supply for stopping supplying a main power supply voltage in a standby mode in which no process is to be performed by the portable information terminal, and starting to supply the main power supply, voltage to said information processing means, said memory means, said input means, and said display means in response to an instruction to start supplying the main power supply voltage; and a connector selectively operable in a normal mode under the main power supply voltage supplied from said main power supply and operable in said standby mode under the power supply voltage supplied from said detecting means, said connector being responsive to an indication to start data communications from said mobile telephone set, for instructing said main power supply to start supplying said main power supply voltage.