Browse Prior Art Database

Holder for Mass Reflow of C4 Chips on Multilayer Flex

IP.com Disclosure Number: IPCOM000113539D
Original Publication Date: 1994-Sep-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Mead, D: AUTHOR [+3]

Abstract

Disclosed is a device that acts to hold a multilayer flex circuit during decal or chip attachment and IR reflow. The Figure is a top and section view of a fixture used to hold a flex circuit.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 91% of the total text.

Holder for Mass Reflow of C4 Chips on Multilayer Flex

      Disclosed is a device that acts to hold a multilayer flex
circuit during decal or chip attachment and IR reflow.  The Figure is
a top and section view of a fixture used to hold a flex circuit.

The following is a sequence to load a flex panel in the fixture and
add a chip.

      The lower left flex fixture tooling hole (2) is placed over a
pin.  The upper right tooling hole (3) is placed over another pin by
depressing the spring loaded actuator (4).  Tension occurs in the
flex between those opposing corners.  The upper left and lower right
tensioner are pushed together until the pins engage the flex holes.
The flex then has tension in all directions.

      The top wire frame (6) pivots on the pins (7) and is secured to
the frame base (12) by fasteners (8).  In this condition, the flex
panel is NOT clamped between the top rods (11) and the bottom rods
(12).  There is a slight clearance between all members to keep the
flex in a plane without clamping.  Note that the top wire frame (6)
is in full contact with the frame base (12) to keep all members at
the correct distances.

      The frame (14) is loaded into placement equipment, where chips
(9) and other components are placed on the flex.  The back plate (13)
absorbs the placement forces that may dislodge other previously
placed components.

      The back plate (13) would then be carefully detached by
removing the fasteners (10).  Ther...