MEASURING METHOD FOR NARROW PITCH LEAD OF ELECTRONIC COMPONENT

摘要

PURPOSE:To provide means for accurately measuring a lead by positioning the lead at a thinnest part of a laser spot light. CONSTITUTION:The number of leads L is counted from a reflected light incident to a photodetector 5 of a laser 3. A count of leads is compared with the number previously registered in a computer to judge propriety of height of the lead L. A distance between the laser 3 and the lead L is regulated based on the judged result, and the lower surface of the lead L is irradiated with the thinnest part 4a of a laser spot light.