Casino chip with antitheft and antiforgery tag circuit and manufacturing method thereof

Abstract

Disclosed is a casino chip with an antitheft and antiforgery function and a method of manufacturing such chips. The casino chip is provided with an RF tag circuit which is capable of exposing an offender, by means of an electronic security system consisting of transmitters and receivers, when the offender steals authorized chips from a casino or wrongfully uses forged chips in the casino. The tag circuit ( 30 ) is not damaged because the tag circuit is protected by a preform ( 10, 20, 40, 50 ) even though the preform comprising the thin tag circuit, which is susceptible to high temperatures, is subjected to an insert-injection molding step, thereby preventing theft of the casino chip.

1 . A casino chip with an antitheft and antiforgery tag circuit, comprising: 
 a first preform provided with convex and concave parts formed in a saw tooth shape on a circumferential surface thereof, a position part consisting of a groove along the circumferential surface thereof and located at a predetermined distance from a center of a combination side, and a cylindrical concave part located on a back of the combination side;    a tag circuit located in the position part of the first preform;    a second preform provided with convex and concave parts formed in a saw tooth shape on a circumferential surface thereof, and a cylindrical concave part located on a back of a combination side, said second preform combined with the first preform at the combination side; and    a final formed part covering the cylindrical concave part located on each preform.    
   
   
       2 . The casino chip according to  claim 1 , further comprising protrusions located on the combination side of the first preform and holes located on the combination side of the second preform.  
   
   
       3 . The casino chip according to  claim 1 , further comprising a position part located on the combination side of the second preform.  
   
   
       4 . The casino chip according to  claim 2 , further comprising adiabatic members inserted into the position part located between each preform and a tag circuit.  
   
   
       5 . The casino chip according to  claim 2 , further comprising packing members each inserted into a cylindrical space part located on a center of each preform.  
   
   
       6 . A method of manufacturing a casino chip with an antitheft and antiforgery tag circuit, comprising the steps of: 
 preliminary injection molding preforms so that the preforms are combined with each other to form an integrated body;    inserting a tag circuit into a position part located on each preform;    combining the preforms having the tag circuits with each other; and    insert-injection molding the combined preforms using a mold.    
   
   
       7 . The method according to  claim 6 , wherein a plurality of preforms engage with each other in the combining step.  
   
   
       8 . The method according to  claim 6 , further comprising the step of inserting an adiabatic member into the position part of each preform after the preliminary injection molding step and before the inserting step.  
   
   
       9 . The method according to  claim 8 , wherein a plurality of preforms are welded to each other by an ultrasonic wave in the combining step.  
   
   
       10 . A method of manufacturing a casino chip with an antitheft and antiforgery tag circuit, comprising the steps of: 
 preliminary injection molding of preforms so that the preforms are combined with each other to form an integrated body, each of said preforms having a space part capable of receiving a packing member and located on a center thereof, said packing member made of a different material from the preform;    inserting a tag circuit into a position part located on each preform;    inserting the packing member into the space part of each perform;    combining the preforms having the tag circuits and the packing members with each other; and    insert-injection molding the combined preforms using a mold.    
   
   
       11 . The method according to  claim 10 , wherein the packing member is composed of substances selected from the group consisting of high specific gravity plastics, ceramics, glasses, and stone plates.  
   
   
       12 . The method according to  claim 6 , wherein a color of the preform produced by the preliminary injection molding step is different from that of the casino chip produced by the insert-injection molding step.