Patent ID: 6011958
Filing Date: 2000-01-04
Classification: G06K

Abstract:
A no-battery information storage medium having a radio communication function of receiving power while receiving an externally transmitted radio wave as modulated data, and transmitting data outside said information storage medium, comprising:one transmission/reception antenna coil for performing transmission/reception;a first full-wave rectifying circuit constituted by four rectifying elements connected to each other by bridging connection and connected to two terminals of said transmission/reception antenna coil;a second full-wave rectifying circuit constituted by four rectifying elements, including two shared rectifying elements of said four rectifying elements constituting said first full-wave rectifying circuit, connected to each other by bridging connection and connected to the two terminals of said transmission/reception antenna coil;power generating means, connected to an output of said first full-wave rectifying circuit, for generating power to be used inside said information storage medium; andconstant-current driver means, connected to an output of said second full-wave rectifying circuit, for performing transmission by extracting a predetermined current from an output of said second full-wave rectifying circuit in accordance with transmission data.