Magnetic Base for Flexible Laminate Module Assembly

Magnetic Base for Flexible Laminate Module Assembly

      Mechanical coplanarity is a requirement for the bottom surface
of modules.  The use of a flexible laminate makes it difficult to
maintain coplanarity of the bottom side of the module, as the
laminate may curl.  Poor coplanarity will cause defects during
assembly of a module to a mother board.

      In this application, the flexible laminate material contains an
Invar core.  This core material is magnetic.

      Module coplanarity may be improved by using a magnetic base to
hold the laminate flat during assembly and cure of the adhesive.
Additional fixturing may be used to align the individual components.

      Modules may be assembled in single piece, strip, or panel
format.  If a strip or panel format is used, a large magnetic base
may be used.  An array of magnets which are mechanically isolated
from each other may also be used to accommodate the mechanical
tolerances of each assembly.