METHOD FOR FITTING LEAD WIRE OF VOICE COIL

PURPOSE:To attain simultaneously the exfoliation of insulating material of both lead wires and electric connection by placing an intermediate lead wire on a lead of a voice coil and then pressing this part by a chip displacing and vibrating. CONSTITUTION:The voice coil bobbin 1 is fitted to a winding jig 9 fixed to the revolving shaft 8 of a voice coil winding machine 7, a magnet wire 2 is wound on the bobbin 1, and both leads 2a, 2b being the beginning and end of the winding are led out unidirectionally. Then, the middle part of the intermediate lead wire 4 is placed in crossing on the leads 2a and 2b. Then, cross points 5, 5' of both leads 2a, 2b and the intermediate lead wire 4 are pressed by using the chip 10 displaying and vibrating. The chip 10 is vibrated by a vibrator 13, a metallic horn 12 and a resonance rod 11 and the pressing is attained by a pressing device 15. The insulating material of both leads is exfoliated by the vibration of the chip 10 and pressing and the conductor is connected electrically by atomic bonding. Further, the cross points 5, 5' are fixed mechanically to the bobbin 1.