Versatile Printed Wiring Board Pattern Inspection Algorithm: Radial Matching

Satoshi Iwata; Moritoshi Ando; Takefumi Inagaki

doi:10.1117/12.969363

21 March 1989 Versatile Printed Wiring Board Pattern Inspection Algorithm: Radial Matching

Satoshi Iwata, Moritoshi Ando, Takefumi Inagaki

Proceedings Volume 1095, Applications of Artificial Intelligence VII; (1989) https://doi.org/10.1117/12.969363
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States

Abstract

We have developed versatile pattern inspection algorithm that we call Radial Matching, which generates pattern code. dictionaries and enables many different patterns to be inspected by changing dictionary contents. The system inspects all defect type analyzing pattern attributes and connections without referencing layout artwork. It measures a copper pattern radially in eight directions. Sensors are 22.5 degrees apart. Length and orientation data are converted 16-bit codes that can express all printed wiring board (1)V1B) patterns, containing ordinal patterns and defects. Dictionaries are generated when 'PWB patterns are inspected and good and defective codes are classified., These features enable a code dictionary to be generated using only the first PWB. Experiments show that original pat terns can be described using 27% of the codes. Code classification for inspection can be done on a 100 mm² area. The new algorithm has been implemented a system in use at a Fujitsu plant.

Citation Download Citation

Satoshi Iwata, Moritoshi Ando, and Takefumi Inagaki "Versatile Printed Wiring Board Pattern Inspection Algorithm: Radial Matching", Proc. SPIE 1095, Applications of Artificial Intelligence VII, (21 March 1989); https://doi.org/10.1117/12.969363

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