Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Four-Up Holding Fixture for Heatsink Screening

IP.com Disclosure Number: IPCOM000120232D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Downs, J: AUTHOR [+2]

Abstract

Disclosed is a single-throw clamping mechanism that self-centers 4 parts at a time to a controlled dimension. Some integrated circuit module packaging requires attachment of heat sinks to the caps. Some heat sinks are stamped, bent and slotted making them very flexible and bendable in all directions. The dimensions of the heatsinks are not accurate enough to assure the accurate screening of bonding material. Positioning is very critical in this operation because the pattern on the heatsink must align with the screen pattern. There is a .003-inch tolerance on the bonding thickness to assure proper heat dissipation and bonding strength when the cap and heatsink are joined. The ability to process multiple heatsinks is desired due to slow cycle time of the processing of non-uniform parts.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 96% of the total text.

Four-Up Holding Fixture for Heatsink Screening

      Disclosed is a single-throw clamping mechanism that
self-centers 4 parts at a time to a controlled dimension. Some
integrated circuit module packaging requires attachment of heat sinks
to the caps.  Some heat sinks are stamped, bent and slotted making
them very flexible and bendable in all directions.  The dimensions of
the heatsinks are not accurate enough to assure the accurate
screening of bonding material.  Positioning is very critical in this
operation because the pattern on the heatsink must align with the
screen pattern.  There is a .003-inch tolerance on the bonding
thickness to assure proper heat dissipation and bonding strength when
the cap and heatsink are joined.  The ability to process multiple
heatsinks is desired due to slow cycle time of the processing of
non-uniform parts.

      Referring to the figure, the fixture is designed to form and
position the heatsinks to the required dimensions. This was
accomplished by fabricating a fixture with machined slots 1 to
properly space each rib of the heatsink in the X-Axis.  The Y-Axis is
controlled by using a single throw cam 2 with a rod 3 interconnecting
rails located on either side of the fixture.  The rails 4 compress 4
heatsinks by moving them toward the center of the fixture.  The 4
springs 5 open the rails to allow loading and unloading the
heatsinks.  The Z-Axis is controlled by the squeegee as it passes
over the screen giving a consistent...