INFORMATION RECORDING/READING METHOD

摘要

Method and apparatus for recording/reading information codes, for reading information codes recorded by an electrolytic ink by a sensor using two kinds of contacts different in ionization tendency. The apparatus comprises a pair of contacts using two kinds of electrodes different in ionization tendency and information codes recorded with ionically conductive electrolyte. The present invention provide a compact and lightweight sensor which is not affected by external environment such as temperature, moisture, brightness, dust, and so forth.