SECURITY CARD WITH OPTICAL DIFFRACTIVE PATTERN

摘要

PURPOSE: A security card applied with a diffraction pattern is provided to allow a user to identify the authenticity of the security card by forming various images through the diffraction pattern. CONSTITUTION: A security card comprises the following: a printed unit(5) printed with a card background; a transparent unit(6) formed with a diffraction pattern diffracting incident light; and a transparent protection unit(8) formed on the upper side of the transparent unit to partially expose the transparent unit. The diffraction pattern has a circular or a multi-layered polygon shape. The diameter of the diffraction pattern is 20~50 micrometers.