Browse Prior Art Database

Adaptable, One-Piece, 4-Up Module Clamping Fixture

IP.com Disclosure Number: IPCOM000036794D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 3 page(s) / 47K

Publishing Venue

IBM

Related People

Kelly, H: AUTHOR [+4]

Abstract

This article describes a single, self-contained fixture that may be utilized for 4-up clamping/sealing of a wide range of semiconductor module substrate/heatsink heights, also allowing for varying spring pressure specifications.

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Adaptable, One-Piece, 4-Up Module Clamping Fixture

This article describes a single, self-contained fixture that may be utilized for 4-up clamping/sealing of a wide range of semiconductor module substrate/heatsink heights, also allowing for varying spring pressure specifications.

Currently, substrates and their adjoining caps or heatsinks are clamped and sent through a sealband reflow furnace for joining one at a time. It was recently proposed to perform this process 4 assemblies at a time, by the use of a "4-up carbon boat" that the chip-join sector uses for the substrates, and a new clamping fixture that would adapt to the boat. In this manner, the throughput of the capping sector would be greatly increased.

One of the most important features of the fixture is the capability to adapt to the many different cap sizes and shapes which must be handled, as well as the varying spring pressure specifications necessary for these caps. Obviously, for handling, logistics, tracking and storage reasons, there must be as few different types of fixtures and fixture accessories (such as spacers) as possible. A second important feature is that the clamping fixture itself should be designed such that it requires a minimum number of separate parts to perform its function. This is true whether there is to be a human operator or a robot assembling the fixture, as the capping press tool's throughput and level of complexity are directly affected. Also, the fixture must be compact enough to fit into the furnace, and be of minimum mass, for furnace heat profile considerations. Finally, it must be reliable, easy to use, and as inexpensive to use and maintain as possible.

The attached drawing illustrates the unique new design developed to satisfy the aforementioned requirements. As can be seen, the fixture is self-contained, with no separate parts or spacers required.

It is basically comprised of a four-armed clamping spider which is able to move vertically on a cente...