The primary bobbin 11 having the above mentioned shape is molded out of an insulating synthetic resin, integral with the connecting portion 14 by insert molding process and {HEAD ~ the secondary core} 2 is fixed in {TAIL ~ the primary bobbin} 11 at the time of insert molding 
The primary bobbin 11 having the above mentioned shape is molded out of an insulating synthetic resin , integral with the connecting portion 14 by insert molding process and { HEAD ~ the secondary core } 2 is fixed in { TAIL ~ the primary bobbin } 11 at the time of insert molding
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