Patent ID: 6791457
Filing Date: 2004-09-14
Classification: B60C,H01Q,Y10T

Abstract:
A transponder for tire having information storage means for gaining access to information within said information storage means at received a predetermined question signal, and for transmitting an answering signal, comprising:a main circuit including: first receiving means for receiving an electromagnetic wave of a predetermined first frequency; first energy converting means for converting energy of the electromagnetic wave received by said first receiving means into electric energy; a central processing unit for operating by means of electric energy to be outputted from said first energy converting means and for reading, on receipt of said predetermined question signal by said first receiving means, storage information of said information storage means in response to the content of said predetermined question signal to generate an electric signal representing answering information for outputting; and transmission means for operating by means of electric energy to be outputted from said first energy converting means and for transmitting an answering signal on the basis of an electric signal representing said answering information outputted from said central processing unit; second receiving means for receiving an electromagnetic wave of a second frequency that is lower than said first frequency; second energy converting means for converting energy of an electromagnetic wave received by said second receiving means into electric energy; a capacitor for accumulating electric energy to be outputted from said second energy converting means; and an additional circuit, in which the electric power consumption of which is larger than that of said main circuit, wherein as a main power source or an auxiliary power source for operating said additional circuit, electric energy accumulated in said capacitor is used.