| 摘要 |
Procedure and system for inspecting a component (1) with leads to determine its fitness for assembly before the component is placed on a circuit board. In the procedure, a narrow illuminating beam (10) is directed at a light-sensitive detector (11). The component (1) and the illuminating beam (10) are moved in relation to each other so that the position as a function of time is known and that the leads (4) of the component pass through the illuminating beam. The illuminating beam thus reaches the light-sensitive detector when it falls between leads, whereas when it falls on leads, the leads cast a shadow, preventing the beam from reaching the light-sensitive detector. The pulse produced by the light-sensitive detector as a result of the illuminating beam being intercepted by the shadowing effect of the leads is registered. Based on the pulse, the width of the lead row and/or the distance between adjacent lead rows are/is computed. The computed width and/or distance are/is compared with a specified allowed respective limit value. The component is placed on the circuit board if the width and/or the distance between adjacent lead rows computed on the basis of the measurement are/is within the allowed limits, or alternatively the component is rejected and removed without placing it on the circuit board if the measured value/values differ undesirably from the allowed limit value. |
