Browse Prior Art Database

Registration Control of Drilled Planes

IP.com Disclosure Number: IPCOM000099242D
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-14
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Wiley, JP: AUTHOR

Abstract

Disclosed is a method for detecting misregistered distribution planes by electrical testing which does require a change of drills.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Registration Control of Drilled Planes

       Disclosed is a method for detecting misregistered
distribution planes by electrical testing which does require a change
of drills.

      A misregistered plane can be detected electrically by a short
circuit between the plane and a plated  This is done by either making
the clearance smaller than normal or by drilling the plated larger
than normal.  However, if the power clearance holes are drilled, this
demands a change in size in either the power plane or the
through-hole.

      The need for drill change is eliminated by drilling a of

                            (Image Omitted)

 through-holes, as shown in 1.  The holes are
placed so that they will normally be to the power plane.  If
misregister is sufficient, or more of them will be disconnected; this
condition can detected by electrical test.  Furthermore, any desired
clearance can be guaranteed by proper hole  The need for a change of
drills is eliminated, improving efficiency and accuracy.  The method
is adaptable to drilled power planes.  Some may require a series of
test holes, as in Fig.  2.