Browse Prior Art Database

Auxiliary Heater for Belt Furnace

IP.com Disclosure Number: IPCOM000050302D
Original Publication Date: 1982-Oct-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 70K

Publishing Venue

IBM

Related People

Goldman, LS: AUTHOR

Abstract

Shown is an auxiliary heating system to supplement furnace heat, allowing: 1) intermixing of substrate types (e.g., thick and thin); 2) joining chips to large thermal mass substrates; and 3) more uniform temperature across the substrate.

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Auxiliary Heater for Belt Furnace

Shown is an auxiliary heating system to supplement furnace heat, allowing:
1) intermixing of substrate types (e.g., thick and thin); 2) joining chips to large thermal mass substrates; and 3) more uniform temperature across the substrate.

The system employs resistance wires embedded in the "boat" or support fixture (e.g., graphite), which, when activated, apply heat around the outside of the substrate. By controlling current to the heater (Fig. 1), the auxiliary heat may be tailored to the substrate and furnace profile.

A major condition for the success of this proposal is an interconnection and wiring scheme. There are many methods possible with one alternative shown in the drawings.

With respect to Figs. 2A-3B, connector blocks are clipped to the chain belt at regular intervals. These blocks contain: 1) a plug for the heater/boat, 2) plugs to connect one block to the next, to transmit power, and 3) metal rollers for rolling contact to a DC "third rail" power supply.

The wiring is schematically shown (Fig. 4). One rail provides voltage, and the other -voltage or ground. Contact is made by the rollers (at least 2-3 sets) when the belt returns inside the furnace.

A complete path is insured by the cables connecting each block.

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