Forgery prevention medium, forgery prevention medium manufacturing apparatus, and forgery prevention medium manufacturing method

Abstract

A forgery prevention medium includes a substrate and a specific invisible material layer directly or indirectly laminated on the substrate, having a specific invisible material reversibly and visually recognized through a predetermined process disposed thereon in a plane shape, and having a part of the specific invisible material inactivated in accordance with a visualized image pattern.

What is claimed is: 
     
         1 . A forgery prevention medium comprising:
 a substrate; and   a specific invisible material layer directly or indirectly laminated on the substrate, having a specific invisible material reversibly and visually recognized through a predetermined process disposed thereon in a plane shape, and having a part of the specific invisible material inactivated in accordance with a visualized image pattern.   
     
     
         2 . The forgery prevention medium according to  claim 1 , wherein the specific invisible material is a fluorescent material, and wherein the predetermined process is to irradiate a predetermined wavelength of light such as a UV ray or an IR ray. 
     
     
         3 . The forgery prevention medium according to  claim 1 , wherein the specific invisible material includes a UV fluorescent material and an IR fluorescent material. 
     
     
         4 . The forgery prevention medium according to  claim 2 , wherein a portion of the specific invisible material corresponding to a black pixel of the visualized image pattern is inactivated. 
     
     
         5 . The forgery prevention medium according to  claim 1 , wherein the specific invisible material is a reversible temperature indicating material, and wherein the predetermined process is to change the temperature of the specific invisible material layer to a predetermined temperature. 
     
     
         6 . The forgery prevention medium according to  claim 5 , wherein a portion of the specific invisible material corresponding to a white pixel of the visualized image pattern is inactivated. 
     
     
         7 . The forgery prevention medium according to  claim 5 , wherein a color change threshold temperature of the temperature indicating material is in the range of −30° C. to 70° C. 
     
     
         8 . The forgery prevention medium according to  claim 7 , wherein a color change threshold temperature of the temperature indicating material is in the range of −20° C. to 5° C. or 40° C. to 60° C. 
     
     
         9 . The forgery prevention medium according to  claim 1 , wherein the specific invisible material includes a fluorescent material and a temperature indicating material. 
     
     
         10 . A forgery prevention medium manufacturing apparatus for manufacturing a forgery prevention medium by using a recording medium including a substrate and a specific invisible material layer directly or indirectly laminated on the substrate and having a specific invisible material reversibly and visually recognized through a predetermined process disposed thereon in a plane shape, the forgery prevention medium manufacturing apparatus comprising:
 a pixel specification unit specifying an inactivation target pixel position corresponding to a specific invisible image formed on the specific invisible material layer based on an image data of an invisible target image input thereto; and   an inactivation unit irradiating a laser beam to the inactivation target pixel position in the specific invisible material layer so as to inactivate the specific invisible material at the inactivation target pixel position.   
     
     
         11 . The forgery prevention medium manufacturing apparatus according to  claim 10 , wherein the specific invisible material includes a fluorescent material, and wherein the pixel specification unit specifies a position of a pixel stopping the emission of fluorescent light during the irradiation of a predetermined wavelength of light as the inactivation target pixel position. 
     
     
         12 . The forgery prevention medium manufacturing apparatus according to  claim 10 , wherein the specific invisible material includes a reversible temperature indicating material, and wherein the pixel specification unit specifies a position of a pixel stopping changing in color or coloring in accordance with an increase in temperature as the inactivation target pixel position. 
     
     
         13 . The forgery prevention medium manufacturing apparatus according to  claim 10 , wherein the inactivation unit irradiates the laser beam by using at least one of a YAG laser, a YVO 4  laser, a semiconductor laser, and a CO 2  laser. 
     
     
         14 . A forgery prevention medium manufacturing method to be carried out by a forgery prevention medium manufacturing apparatus for manufacturing a forgery prevention medium by using a recording medium including a substrate and a specific invisible material layer directly or indirectly laminated on the substrate and having a specific invisible material reversibly and visually recognized through a predetermined process disposed thereon in a plane shape, the forgery prevention medium manufacturing method comprising:
 specifying an inactivation target pixel position corresponding to a specific invisible image formed on the specific invisible material layer based on an image data of an invisible target image input thereto; and   irradiating a laser beam to the inactivation target pixel position in the specific invisible material layer so as to inactivate the specific invisible material at the inactivation target pixel position.   
     
     
         15 . The forgery prevention medium manufacturing method according to  claim 14 , wherein the specific invisible material includes a fluorescent material, and wherein in the specifying of the inactivation target pixel position, a position of a pixel stopping the emission of fluorescent light during the irradiation of a predetermined wavelength of light is specified as the inactivation target pixel position. 
     
     
         16 . The forgery prevention medium manufacturing method according to  claim 14 , wherein the specific invisible material includes a reversible temperature indicating material, and wherein in the specifying of the inactivation target pixel position, a position of a pixel stopping changing in color or coloring in accordance with an increase in temperature is specified as the inactivation target pixel position.