Browse Prior Art Database

Insert And Straight Pin Set to Align Applied Card Edge System Connector And Card Assembly

IP.com Disclosure Number: IPCOM000102710D
Original Publication Date: 1990-Dec-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Chang, JP: AUTHOR

Abstract

Disclosed is a means to provide a precision alignment between solder tails of an edge connector and pads on card. The alignment is very critical to solder joint reliability. A simple mechanical means consisting of an insert and straight pin set will accomplish this important alignment.

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This is the abbreviated version, containing approximately 65% of the total text.

Insert And Straight Pin Set to Align Applied Card Edge System Connector And Card Assembly

       Disclosed is a means to provide a precision alignment
between solder tails of an edge connector and pads on card. The
alignment is very critical to solder joint reliability. A simple
mechanical means consisting of an insert and straight pin set will
accomplish this important alignment.

      Tolerance analysis concluded that solder tail overhanging
outside of card pad will result due to the tolerance build ups.  This
condition leads to undesirable solder joints and also provides a
trapping area that will be difficult to clean.

      The invention described here will solve the problem.  A set of
inserts and straight pins are the only parts required.  The insert
has a split wall design so that its diameter will expand when an
oversized straight pin is driven in.  Fig. 1 shows the mechanical
parts required as well as the assembly concept.  The assembly
sequence is:
      a.  Drop inserts into hole openings of assembly.
      b.  Force straight pins into inserts.  Since D1 is greater than
D2, the downward motion of pin will expand the insert.
 c.  Enlargement of insert diameter will apply a compressive force on
hole walls and automatically align the connector with card assembly.

      The advantages of this invention include:
      a.  No solder tail overhang.  No dirt collecting trapping
areas.
 b.  Because force on hole is compressi...