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