| 摘要 |
PURPOSE:To detect the existence of short-circuit and disconnection in a conductor pattern by a method wherein a voltage is applied to a conductor pattern, and said pattern surface is scanned by means of a magnetic head to draw out signals. CONSTITUTION:A plurality of thin-line electrodes 2 are arranged on a glass substrate 1 at equal intervals and alternately divided into two electrode groups, which are connected with connecting wires 4 and 5 respectively. The connecting wires 4 and 5 are connected with an AC, DC or pulse supply source 3 (in the present example, an AC supply source having an audio frequency of several hundred- several thousand Hz). A magnetic head 6 moves in the direction of an arrow S1 to draw out outputs. The outputs of the head 6 are amplified in an amplifier 7 to drive a speaker 8. If there is a short-circuit P1 between adjacent electrodes 2a and 2b, an AC current flows, and a magnetic field is generated. Consequently, the magnetic field at the point P1 is detected and outputted as a sound from the speaker. Thereby, the short-circuited portion can be confirmed. In addition, reversing the constitution permits the disconnection portion to be confirmed. |
