Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1985-06-17
1987-05-26
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358106, 382 8, 364571, 356237, H04N 700
Patent
active
046689826
ABSTRACT:
A registration system for compensating for distortion of a test printed circuit board relative to a stored reference in a printed circuit board inspection system is disclosed. Fiducial marks on the corners of the test board are compared with fiducial marks on the corners of the stored reference to determine relative distortion of the test board with respect to the reference board. This information is utilized to load a memory so that exposure pulses of a scanning CCD camera occur at intervals which compensate for distortion of the test board in the scanning direction x. The fiducial comparison information is also used to generate a gate on the occurrence of each exposure pulse to compensate for distortion of the test board in the y-direction. The exposure pulses are further utilized to generate addresses to a buffer memory storing the reference board to cause patches representative of the reference board to be read out of memory in registration with patches representative of the counterpart surface location of the test board to permit accurate real time comparison of the test board to the stored reference board.
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"Automatic Inspection for Printed Wiring", Thibadeau et al., IPC Meeting, Oct. 1982.
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"Automatic Inspection System for PC Boards", Hara et al., IEEE 1982.
"Automatic Optical Inspection of PC Boards", Bible et al., Wescon 1983, IEEE Conference vol. 27, Nov. '83.
"Automatic Copper Pattern Inspection System for PW Boards" Ando et al., IIPEC, WC111-26, May '84.
Grimes Edwin T.
Groody James J.
Kostak Victor R.
Masselle Francis L.
Murphy Thomas P.
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