| 摘要 |
PROBLEM TO BE SOLVED: To provide a seat cushion material including an antenna electrode at low cost. SOLUTION: The cushion material 22 including the integrated antenna electrode 21 composed of an aggregate of conductive microparticles 37 on the surface is molded by magnetically attracting ferromagnetic conductive microparticles 37 to a die magnet 35 disposed on a cavity surface 34 of a molding die, collecting the surplus conductive microparticles 37 by a conductive microparticle collecting magnet 39, and foaming an urethane resin stock solution 40 injected into the molding die. With this structure, steps for printing the antenna electrode 21 on an insulation sheet or pasting the antenna electrode 21 to the cushion material 22 are not necessary, and further, positioning of the antenna electrode 21 to the cushion material 22 is not necessary either. As a result, the cost of manufacturing the cushion material 22 can be reduced. Further, as the conductive microparticles 37 magnetically attracted to the die magnet 35 are not moved when the urethane resin stock solution 40 is injected and foamed, the antenna electrode 21 of the uniform thickness can be formed, and voids are not formed on the surface of the cushion material 22. COPYRIGHT: (C)2011,JPO&INPIT
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