| 摘要 |
PROBLEM TO BE SOLVED: To evaluate unwinding performance of a thin bonding metal wire conveniently and objectively by turning a spool to unwind a thin metal bonding wire sequentially and then inspecting the unwinding state thereof. SOLUTION: A thin metal wire 4 wound around a spool 3 is fixed to a spool holder and then the spool 3 is turned in a windshield container 8 to unwind the thin metal wire 4. The unwound thin metal wire 5 drops with the self-weight thereof. When the thin metal wire 5 is unwound smoothly, it is not detected by a sensor 9 but when abnormality occur, e.g. the thin metal wire is caught, it is detected by the sensor 9. When the spool 3 is turned continuously, abnormality is eliminated and the thin wire is unwound again smoothly. Unwinding performance is evaluated by measuring the number of detection times of the sensor 9. |
