MANUFACTURING METHOD OF HELICAL ANTENNA, AND PRIMARY MOLDING OF HELICAL ANTENNA

摘要

PROBLEM TO BE SOLVED: To provide a method of manufacturing a helical antenna that can be formed by a die of a simple structure, has excellent appearance, and reduces manufacturing cost, and to provide a primary molding of the helical antenna molded in a manufacturing process based on the manufacturing method.;SOLUTION: In the manufacturing method of the helical antenna 1 for integrally forming a helical coil 10 where a connection fixture 13 is connected to a base end, and a resin covering the helical coil 10, the helical coil 10 is attached to a primary cavity 21 of a die 20 for primary molding, a primary slide core 23 is inserted into the inner periphery of the tip of the helical coil 10 by a length determined by a prescribed ratio to the length of the helical coil 10 via a primary through hole 22 formed at the tip of the die 20 for primary molding, and the first cavity 21 is filled with resin.;COPYRIGHT: (C)2009,JPO&INPIT