Apparatus for checking patterns on printed circuit boards

Details Apparatus for checking patterns on printed circuit boards Apparatus for checking patterns on printed circuit boards

1986-03-12

1987-07-14

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

356394, 382 8, 382 45, H06N 718

Patent

active

046806270

ABSTRACT:
In an apparatus for checking patterns on printed circuit boards by comparing two patterns formed on two printed circuit boards, registration patterns each including orthogonal straight line segments and respectively formed on the two printed circuit boards are imaged by two imagers, and registration images from the imagers are matched by means of a registration unit to accurately match an image of a pattern to be checked on one printed circuit board with an image of a reference pattern on the other printed circuit board.

REFERENCES:
patent: 3988535 (1976-10-01), Hickman
patent: 4240750 (1980-12-01), Kurtz
patent: 4319845 (1982-03-01), Shuji
patent: 4334241 (1982-06-01), Kashioka
patent: 4389669 (1983-06-01), Epstein
patent: 4481533 (1984-11-01), Alzmann
patent: 4614430 (1986-09-01), Hara

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