Patent ID: 7637435

Claim:
An integrated circuit (IC) tag which comprises a means for recording and erasing invisible information and a means for recording and erasing visible information which are disposed on a surface of a support and allow recording and erasure of the information in a non-contact manner, wherein the means for recording and erasing visible information have a printing layer having a structure such that a layer of a heat sensitive color developing material, a layer of a material absorbing light and converting absorbed light into heat and a protective layer are laminated on the surface of the support successively from the surface, or a layer of a material absorbing light and converting absorbed light into heat, a layer of a heat sensitive color developing material and a protective layer are laminated on the surface of the support successively from the surface wherein the means for recording and erasure of visible information is suitable for recording and erasure of visible information with a laser beam having an oscillation wavelength of 700 to 1,500 nm, and said IC tag has a shape of a label and has a structure such that: (a) a first adhesive layer, a first support, a second adhesive layer, an antenna circuit formed on one face of a second support via a third adhesive layer and is connected to an IC chip disposed on the face of the second support via the third adhesive layer, a fourth adhesive layer and a reversible heat sensitive recording material as the means for recording and erasing visible information are laminated in an order presented above, or (b) a first adhesive layer, a first support, a second adhesive layer, an antenna circuit formed on one face of a second support via a third adhesive layer and is connected to an IC chip disposed on the face of the second support via the third adhesive layer, and a reversible heat sensitive recording material as the means for recording and erasing visible information are laminated in an order presented above.