Boots – shoes – and leggings
Patent
1990-01-05
1992-05-05
Smith, Jerry
Boots, shoes, and leggings
36447435, 382 49, 408 16, G06F 1546
Patent
active
051114062
ABSTRACT:
In order to correct for misregistration of solder pads in multilayer board (MLB) panels and determine drill target locations through vertical stacks of the solder pads, a fixture is prepared with fixture holes arranged in a pattern that corresponds with the locations of fiducial pads that are located on the MLB panel. The fixture has tooling pins that engage with tooling holes in the MLB panel to hold the MLB panel in an absolute position relative to the fixture. An x-ray inspection system views the superimposed image of a selected fixture hole and a corresponding fiducial pad that is visible within the boundary of the fixture hole. A software routine is then used to compute the offset between the fixture hole and the fiducial pad. The process is then repeated for the remaining sample of fixture holes and fiducial pads. The results are then fitted and then sent to a drilling machine to determine a position for the drilled holes in the MLB panel that compensates for the misregistration of the solder pads.
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PA-120 Operations Manual, Nicolet Instrument Corporation, release date Jul. 17, 1989.
K. Bieneman, "Drill Position Optimization Techniques Using Real-time X-ray Imaging", Nicolet Instrument Corporation, presented at the Printed Circuit Fabrication Exposition, Minneapolis, MN Sep. 15, 1987.
K. Bieneman, "Drill Position Optimization for MLB Process Control", PC FAB, Mar. 1988, pp. 45-50. This is a later version of the above-listed paper presented at the Printed Circuit Fabrication Exposition.
"MU 90 S: Controle des Circuits Imprimes", Usine Nouvell, issue #16, Apr. 21, 1988.
E. R. Davies, "Circularity--A New Principle Underlying the Design of Accurate Edge Orientation Operators", Image and Vision Computing, vol. 2, No. 3, pp. 134-142.
E. R. Davies, "A Modified Hough Scheme for General Circle Location", Pattern Recognition Letters, vol. 7, pp. 37-43 (1988).
Hudzik James S.
Kuntz Robert A.
Smith Steven R.
Zachman Julie C.
Gordon Paul
Nicolet Instrument Corporation
Smith Jerry
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