Browse Prior Art Database

Z Axis Wire Cut

IP.com Disclosure Number: IPCOM000037825D
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-30
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Funk, S: AUTHOR [+3]

Abstract

During the capping process thermal paste is dispensed onto the caps prior to bonding with the substrate, which when bonded with the substrate allows heat from the computer chips to conduct into the cap to cool the substrate. A .003 wire is used to cut the paste after the paste is dispensed. This wire cut assembly is mounted to the base plate and travels back and forth on a fixed plane. Unfortunately, when the wire is on the same plane the caps must be presented to the tool in such a way as to cause the wire to occasionally rake over sites already dispensed on a multi-site cap. The problem can be alleviated by providing Z movement to the product after each dispense operation.

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Z Axis Wire Cut

During the capping process thermal paste is dispensed onto the caps prior to bonding with the substrate, which when bonded with the substrate allows heat from the computer chips to conduct into the cap to cool the substrate. A .003 wire is used to cut the paste after the paste is dispensed. This wire cut assembly is mounted to the base plate and travels back and forth on a fixed plane. Unfortunately, when the wire is on the same plane the caps must be presented to the tool in such a way as to cause the wire to occasionally rake over sites already dispensed on a multi-site cap. The problem can be alleviated by providing Z movement to the product after each dispense operation.

The proposed solution to this problem is to have the wire travel up and down with the dispense head rather than be mounted separately on the base plate as in the prior art. One possible design is shown in the FIG.

Some features of this design include:

Dispense head and wire have set positions for proper clearance and are adjusted together for dispensing proper thickness of paste.

Cap positioning tooling is easier to design and build because the head has the Z motion needed to allow dispensing inside the caps.

Disclosed anonymously.

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