| 摘要 |
PURPOSE:To detect poor soldered parts positively at a high speed with a simple apparatus by illuminating the soldered part, photographing the image of said part, counting the number of bright regions, and judging the quality thereof. CONSTITUTION:A ring shaped lighting device 3 is provided so that an electronic part 2 is uniformly illuminated. The image of a printed board 1 on which the electronic part 2 is mounted is picked up with a video camera 4. The obtained image signal undergoes A/D conversion in an image binary coding circuit 5. The signal is further binary-coded with a luminance value. The binary coded image signals are processed as follows: the picture elements in the bright area are collected so that the picture elements at the upper and lower parts and right and left parts are gathered together with an area extracting circuit 6; and the number of bright regions 9 which cannot be collected in the same area at the final stage is counted. Thus the number of the regions 9 is inputted into a judging circuit 7. The number is compared with the number of the regions 9 in a good soldered part 8 which is picked up beforehand and used as a stored reference. When the number of the regions 9 obtained in the circuit 6 is larger than the reference number of the regions 9, the product is judged as a defective product. When the number is small, the product is judged as a good product. |
