Browse Prior Art Database

Module Precision Alignment Nest

IP.com Disclosure Number: IPCOM000102212D
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Yu, S: AUTHOR [+2]

Abstract

Described is an alignment nest to center surface-mountable modules having a plurality of solder balls.

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

Module Precision Alignment Nest

       Described is an alignment nest to center
surface-mountable modules having a plurality of solder balls.

      Using this nest, a robot or pick-and-place machine places
SMT-MLC modules accurately on footprint pads on a circuitized
substrate.  It is then placed into the alignment nest.  Collars B on
four sides have an inclined surface of 30 degrees.  Therefore, the
opening is wider on top to accommodate the total tolerance
accumulated from component tray, robot, module, etc.  The collar
guides the module into position so that its solder balls rest on the
wedges for centering the module by averaging the ball-to-ball
tolerances.  The module is then picked up by the machine and placed
on the pads.

      This concept may be used in placement applications where the
module has a full array of solder balls.