| 摘要 |
PURPOSE:To improve the accuracy of the inspection results and substantially shorten the time required for inspection, by a method wherein the quality of through holes in a printed board is inspected by detecting and measuring the level of light quantity. CONSTITUTION:A printed board 1b is set on a printed board feeder 21 through an operation panel 24. The light which is projected from a projector 1a and reflected by the inner wall of a through hole 1c in the printed board to pass therethrough is detected by a light detector 1d and converted into an electric level. A controller 23 makes comparison and judgement as to whether the through hole is good or bad, and drives a defective part marking device 26 when the through hole is bad. Such a series of operations is continuously and repeatedly conducted at the through hole reference lattice pitch to complete the inspection of all the through holes in the printed board. This judgement of the quality is comprehensively made, and non-defective and non-conforming articles are selected and sorted by a selector 22. |
