Patent Abstract:
The present invention provides a kind of contactless and intelligence-wise code identification chip system. The contactless and intelligence-wise code identification chips have an identification code respectively. The chips can generate a random number to select one of time slots for allocating said identification code. The contactless and intelligence-wise code reader can read the identification code from time slots by the polling method.

Full Description:
PRIORITY REFERENCE TO PRIOR APPLICATION 
   This application claims benefit of Taiwanese patent application serial number 091122910, entitled “Contactless and Intelligence-Wise Code Identification Chip System,” filed on Oct. 3, 2002, by inventor Chun-Ping Lin. 
   FIELD OF THE INVENTION 
   The present invention is relative to a contactless and intelligence-wise code identification chip system, especially for the system that transfers the identification code by the time slots. 
   BACKGROUND OF THE INVENTION 
   General identification codes are stored in the magnetic cards, and every card has one identification code. When a magnetic card is rushed through a card reader, the card reader could be able to identify the card user by the identification code stored in the card. But it is inconvenient for a user to take a card and rush through the card reader for identifying. So, a contactless identification code system is developed to improve the drawback of the conventional magnetic cards. The Contactless identification code system is able to identify the identification code by induction coil  12  in the card reader  11  i s able to produce a magnetic field. There is a contactless identification code IC  14  and an induction coil  15  in the card  13 . An identification code is also set in this card. When the card  13  closes to the code reader, the induction coil  15  will be coupled and provides the electric power of the IC  14  according to the electromagnetic induction theory. Then the code stored in the IC will passes to the card reader  11  to identify. So, by closing the card, the card reader, but not rushing through it, can identify a user&#39;s code. 
   The prior art is designed for identifying one card every time. If several cards are taken close to the code reader for identifying concurrently, then the ID collision will be happened and the code identification would be wrong. Therefore, the prior art can&#39;t apply to the card identification toys or supermarket clerks for identifying several same or different items concurrently. 
   SUMMARY OF THE INVENTION 
   The main object of present invention is to provide a contactless and intelligence-wise code identification chip system for identifying the identification codes one by one in several code chips. And the ID collision will not happen to make the code identification fail even though these code chips with the same code. The accuracy of code identification almost can be 100%, so we can apply the contactless and intelligence-wise code identification chip system to the card identification toys or supermarket clerks to identify several same or different items concurrently. 
   BRIEF DESCRIPTION OF THE INVENTION 
   According to the present invention, a contactless and intelligence-wise code identification chip system for transferring an identification code by a plurality of time slots. The plurality of chips include the identification code and are able to generate random numbers. The random number is used to select one of the time slots for allocating the identification code. And, the contactless and intelligence-wise code reader can read the identification code from the plurality of time slots by a polling method. 
   In accordance with one aspect of the present invention, the contactless and intelligence-wise code identification chip is induced by a magnetic field energy, and transfers the identification code to the contactless and intelligence-wise code reader. 
   In accordance with one aspect of the present invention, the random number is an integer among 0 to N, and N is an integer larger than 1. 
   In accordance with one aspect of the present invention, an interval of the time slot is 2 ms. 
   In accordance with one aspect of the present invention, the contactless and intelligence-wise code reader reads the identification code from the plurality of time slots by the polling method at least once. 
   In accordance with one aspect of the present invention, the contactless and intelligence-wise code reader also includes a memory unit to record the time slot and the identification code. 
   In accordance with one aspect of the present invention, the contactless and intelligence-wise code reader also includes an output unit to output a content of the memory unit. 
   According to the present invention, the method provides a plurality of contactless and intelligence-wise code identification chips to transfer an identification code by a plurality of time slots, and comprising steps of: 
   Generate a random number by the contactless and intelligence-wise code identification chip, the random number being used to select one of time slots for allocating the identification code; and 
   Read the identification code from the plurality of time slots by the contactless code reader with a polling method. 
   In accordance with one aspect of the present invention, the contactless and intelligence-wise code identification chip is induced by a magnetic field energy, and transfers the identification code to the contactless and intelligence-wise code reader. 
   In accordance with one aspect of the present invention, the random number is an integer among 0 to N, and N is an integer larger than 1. 
   In accordance with one aspect of the present invention, the interval of the time slot is 2 ms. 
   In accordance with one aspect of the present invention, the contactless and intelligence-wise code reader reads the identification code from the plurality of time slots by the polling method at least once. 
   In accordance with one aspect of the present invention, the contactless and intelligence-wise code reader also includes a memory unit to record the time slot and the identification code. 
   In accordance with one aspect of the present invention, the contactless and intelligence-wise code reader also includes an output unit to output the content of the memory unit. 
   The present invention may best be understood through the following description with reference to the accompanying drawings, in which: 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  shows the block diagram of prior contactless code identification system. 
       FIG. 2  shows a preferred embodiment of the contactless and intelligence-wise code identification chip system according to the present invention. 
       FIG. 3  shows a preferred embodiment of different code chip but generate the same random number. 
       FIG. 4  shows a preferred embodiment of different code chip with the same identification code. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     FIG. 2  is a preferred embodiment of the contactless and intelligence-wise code identification chip system according to the present invention. As shown in  FIG. 2 , there are three contactless and intelligence-wise code identification chips IC 1 , IC 2 , and IC 3  with identification codes ID 1 , ID 2 , and ID 3  respectively, and they are put into the magnetic field of the induction coil  12  of the contactless and intelligence-wise code reader  21 . After IC 1 , IC 2 , and IC 3  getting energy from the electrical magnetic field, they will randomly generate the random numbers to allocate ID 1 , ID 2 , and ID 3  into the time slots respectively. In  FIG. 2 , the random numbers are 1, 3, and 30; therefore the time slots for IC 1 , IC 2 , and IC 3  are T 1 , T 3 , and T 30  respectively. 
   The contactless and intelligence-wise code reader  21  reads every time slot by polling for the identification code. So, in the preferred embodiment, the contactless and intelligence-wise code reader  21  will polling from T 0  to T 63  (actually, it also may be infinite number); then the reader will get ID 1  in T 1 , ID 2  in T 3 , and ID 3  in T 30 . ID 1 , ID 2  and ID 3  will be stored in the memory unit  211  and output by the output unit  212 . 
   Because of the random numbers are randomly generated by the contactless and intelligence-wise code identification chips, there would be the same random number generated by the different chips and several identification codes would be allocated in the same time slot. As shown in  FIG. 3 , IC 1  and IC 2  generate the same random number. That will lead ID 1  and ID 2  both to be allocated in T 2 , and the contactless and intelligence-wise code reader  21  will get ID 1  and ID 2  concurrently in T 2 . In order to avoid incorrect code identification, IC 1 , IC 2 , and IC 3  must re-generate new random numbers for next time slot polling. 
     FIG. 4  shows another special case. IC 1  and IC 2  have the same identification code ID 1 , but the random numbers are 1 and 3 respectively. So ID 1  of IC 1  will be allocated in T 1 , and ID 1  of IC 2  will be allocated in T 3 . The contactless and intelligence-wise code reader  21  can easily identify the identification codes by the different time slots. 
   Further more, if the conditions of FIG.  3  and  FIG. 4  happen at the same time, that is, the different chips have the same identification code and be allocated in the same time slot, it will be difficult to identify the identification codes. In order to enhance the exactness and accuracy for the code identification, the code identification method must repeat for one more times until getting the same result, then we can make sure the result is exact. 
   Considering the cost of manufacturing, the technique of “chip pads coding” can be applied to the present invention. The theory of chip pads coding is based on the third power (3^x) extension of each input pad. For example, we may create 3^3=27 kinds of identification codes with 3 input pads. As well as, the 243 different identification codes can be created with 5 input pads. Above all, these different codes can be created by only one mask when the chips are produced. With this design, the contactless and intelligence-wise code identification chip can be mass-produced with very low cost on the application of identification code. 
   The present invention is very suitable for the toy development. For example, in the card identification game machine the chips can be implanted into the cards having graphs. So, the reader can identify the cards when children take these cards close to it. Of course, the children may take several cards to the code reader concurrently, and the reader of present invention will not fail. Despite the cards with a different or the same identification codes are taken close to the code reader, the code reader can identify them one by one, and reads out all the names of the graph on the cards. 
   The present invention is provided to improve the prior art, which can identify the identification codes one by one among several code chips. The ID collision will not happen even though these code chips with the some code. Above all, the accuracy of code identification almost can be 100%, so we can apply the contactless and intelligence-wise code identification chip system to the card identification toys or the supermarket clerks to identify several same or different items concurrently. 
   While the invention has been described in terms of what are presently considered to be the most practical and preferred embodiments, it is to be understood that the invention need not be limited to the disclosed embodiment. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims that are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.

Technology Classification (CPC): 6