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 the secondary core 2 is fixed in {HEAD ~ the primary bobbin} 11 at {TAIL ~ the time} of insert molding 
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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 the secondary core 2 is fixed in { HEAD ~ the primary bobbin } 11 at { TAIL ~ the time } of insert molding
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