| 摘要 |
PURPOSE:To detect a disconnection positively by mounting a photo-coupler in a discharge circuir for a device, through which a ball is formed to a wire by utilizing a discharge torch, and detecting the presence of discharge currents by the photo-coupler. CONSTITUTION:A wire 1 is wound on a spool 2 under the state in which the base tip side is grounded, and the tip side downward extends through a clamper 3 and a capillary 4, and approaches to a discharge electrode 5 at a lower end. The discharge electrode 5 forms a discharge circuit through the wire 1, the capillary 4, the spool 2, a grounding, a diode 6 for protection, a photo-coupler PC1, a transformer 7 and a resistor R1. The output side of the photo-coupler PC1 is connected to an input to a base in a transistor TRS and amplified. The presence of discharge can be detected sufficiently by TRS, but discharge within a fixed time is made the same as the state of no discharge as a defective by connecting a rheostat R3 and a capacitor C, and defective discharge and a defective ball can be detected. |
