IC CARD AND IC CARD IMAGE FORMING METHOD

摘要

An excellent IC card having a distribution H of the card thickness satisfying the relation DeltaH/L<=0.02 where DeltaH is the variation of the card thickness among the points measured at intervals L of 0.5 mm or more in a predetermined direction, wherein the image defect is improved. A method for forming an image on the surface of the above IC card using a thermal transfer printer head, wherein the thermal transfer printer head is pressed against the surface of the IC card to form an image in such a way that the variation DeltaD of the gap D between the thermal transfer printer head and the surface of the IC card is DeltaD/L<=0.02 when the gap D is measured at regular intervals L of 0. 5 mm or more. The smoothness of the surface of the IC card after image formation is improved, and the image defect of when an image is formed using a thermal transfer printer head is improved.