VISIBLE RECORDING METHOD FOR CARD

PURPOSE:To perform the mechanical check of the automatic examination of tickets or the like by together forming an image containing a character and/or a numeral and an encoded image readable by an optical apparatus at the time of the formation of a visible image from a frost surface and a smooth surface. CONSTITUTION:A card 1 having a smooth layer 11 composed of a synthetic resin formed to the surface thereof is used and a visible image is formed from the frost surface 17 having strain formed to a part of the smooth layer 11 within the temp. range from the glass transition temp. of the resin to the m.p. thereof and the smooth surface. At this time, an image 21 containing a character and/or a numeral and an encoded image 22 readable by an optical apparatus are together formed. At the time of the entry due to this card, when the frost surface 17 is partially heated at temp. higher than frost treatment temp., only the heated part returns to the smooth surface and an image 2 appears on the basis of the difference in reflectivity between the frost surface and the smooth surface. At the time of exit, the encoded image 22 is read by the optical apparatus incorporated in an automatic ticket examining machine and compared with encoded data 9 preliminarily printed on the card to check for illegal riding.