Electricity: measuring and testing – Plural – automatically sequential tests
Patent
1988-10-03
1990-04-17
Karlsen, Ernest F.
Electricity: measuring and testing
Plural, automatically sequential tests
174262, 324158R, 324538, G01R 3102, G01R 3104, H05K 109
Patent
active
049183800
ABSTRACT:
A system for measuring the amount and direction of misregistration of each layer of a panel from which multilayer printed circuit boards are separated. The system utilizes a conductor pattern having a conductive trace positioned on each layer of the panel. Each conductive trace includes two trace portions positioned in opposing relation with a plurality of conductive through-holes being positioned therebetween. Each trace portion includes a plurality of elongate conductor portions positioned incrementally varying distances from a common axis. The conductive through-holes are formed in the panel after the layers have been fabricated and joined. If the through-holes are in electrical contact with either trace portion, then the amount of misregistration can be determined. Further, by determining which trace portion the through-hole is in contact with, the direction of misregistration can be determined. By adding additional trace portions, the quantity of misregistration in other directions may be determined.
REFERENCES:
patent: 3243498 (1966-03-01), Allen et al.
patent: 3859711 (1975-01-01), McKiddy
patent: 4432037 (1984-02-01), Brabetz
patent: 4510446 (1985-04-01), Braun et al.
MIL-STD-275E, 12/31/84 Superseding MIL-STD-275D, Apr. 26, 1978; and MIL-STD-1495, Aug. 3, 1973-Military Standard-Printed Wiring for Electronic Equipment, Department of Defense.
LandOfFree
System for measuring misregistration does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for measuring misregistration, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for measuring misregistration will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1055161