RFID tag and manufacturing method thereof
First Claim
1. An RFID tag comprising an RFID IC chip and an antenna, wherein the RFID IC chip comprising bump electrodes, the antenna is formed of a conductive paste comprising conductive particles on one of a resin material and a paper material, the bump electrodes of the RFID IC chip are connected to the antenna by a thermoplastic resin contained in the conductive paste of the antenna, and a lower surface of the RFID IC chip and an upper surface of the antenna are covered with the thermoplastic resin.
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Accused Products
Abstract
In an RFID (radio frequency identification) tag comprising an antenna formed of a conductive paste containing conductive filler like silver flakes on a base member, and an RFID chip connected to the antenna, the present invention cures a pattern of the antenna formed of the conductive paste, and then connects the RFID chip to the antenna with thermoplastic resin contained in the conductive paste by heating bump electrodes of the RFID chip in contact with the antenna. According to the present invention, Since the bump electrodes of the RFID chip and the antenna are connected to each other and establish sufficient electrical conduction therebetween without providing an anisotropic conductive sheet or the like therebetween, a highly reliable RFID tag is supplied at a low cost.
46 Citations
15 Claims
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1. An RFID tag comprising an RFID IC chip and an antenna,
wherein the RFID IC chip comprising bump electrodes, the antenna is formed of a conductive paste comprising conductive particles on one of a resin material and a paper material, the bump electrodes of the RFID IC chip are connected to the antenna by a thermoplastic resin contained in the conductive paste of the antenna, and a lower surface of the RFID IC chip and an upper surface of the antenna are covered with the thermoplastic resin.
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7. An RFID tag comprising:
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a base member;
an antenna layer formed of a resin material containing conductive particles on a main surface of the base member; and
an IC chip having a surface on which electrodes are formed and which faces a portion of the main surface of the base member to connect the electrodes to the antenna, wherein the antenna has a first portion facing the surface of the IC chip and a second portion extending outside a region of the main surface of the base member covered with the IC chip, the electrodes of the IC chip are bonded to the first portion of the antenna by the resin material of the antenna, and a density of a solvent or a precursor of the resin material remaining the first portion of the antenna is lower than that remaining in the second portion. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of manufacturing an RFID tag, comprising steps of:
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printing a conductive paste containing a thermoplastic resin and conductive particles on a resin material or a paper material to form an antenna;
arranging bump electrodes of an IC chip for the RFID tag in positions of the antenna in which the bump electrodes of the IC chip are to be mounted;
pressing the IC chip and the antenna by heat;
supplying a thermoplastic resin to a bonding part between the IC chip and the antenna; and
hardening the thermoplastic resin by heat.
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14. A method of manufacturing an RFID tag, comprising:
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bonding bump electrode surfaces of a semiconductor wafer on which a plurality of IC chips are sequentially formed to an adhesive tape;
dicing a surface of the semiconductor wafer opposite to the bump electrode surfaces to segment the semiconductor wafer into the IC chips; and
peeling the IC chips from an adhesive tape without reversing the IC chips and mounting each of the IC chips on the antenna without reversing the each of the IC chips to connect the each of the IC chips to the antenna.
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15. A method of manufacturing an RFID tag, comprising:
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bonding a surface of a semiconductor wafer opposite to bump electrode surfaces of the semiconductor wafer on which a plurality of IC chips are sequentially formed to a first adhesive tape;
dicing the semiconductor wafer to segment the semiconductor wafer into the IC chips;
transferring the IC chips to a second adhesive tape so that the bump electrode surfaces are adhered to the second adhesive tape;
peeling the IC chips off from the first and second adhesive tapes without reversing the IC chips; and
mounting each of the IC chips on the antenna without reversing the each of the IC chips to connect the each of the IC chips to the antenna.
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Specification