Browse Prior Art Database

Componentless Jumper for Electronic Card Assembly

IP.com Disclosure Number: IPCOM000117660D
Original Publication Date: 1996-Apr-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 72K

Publishing Venue

IBM

Related People

Bocchino, TA: AUTHOR [+5]

Abstract

Disclosed is a method for the "jumpered" configuration of electronic card assemblies by applying solder paste to a special pattern of copper pads; no components are needed.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Componentless Jumper for Electronic Card Assembly

      Disclosed is a method for the "jumpered" configuration of
electronic card assemblies by applying solder paste to a special
pattern of copper pads; no components are needed.

      Today's motherboard and electronics assembly marketplace
requires a flexibility in design such that system features can be
configured at the last possible moment.  One way of accomplishing
this is through the use of zero-ohm resistor "jumpers" which are
populated (or depopulated) on the boards during the card assembly
process.  Another method is to use Berg-style headers and clips which
are also populated at card assembly time.  These methods have several
drawbacks:
  o  Component cost -- Each part costs money; in a high-volume
      manufacturing arena this translates to thousands of dollars per
      year.
  o  Assembly time -- Each part that must be placed adds time to the
      assembly process.  Often there are several dozen jumpers on a
      given motherboard.
  o  Reliability -- Each additional component inherently degrades
      reliability as proven by statistics.  Poor connections,
      misaligned components, mis-populated values are all possible
      defects that can affect the function of the board.
  o  Board area -- Each part takes up board space which is very
      limited in dense designs such as those for notebooks and
Personal
      Digital Assistants (PDA).

      The ideal board would be one designed without requiring
configuration jumpers.  This is not possible, so the next best thing
is to minimize the number of component...