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Conformable Thermal Print Heat Sink

IP.com Disclosure Number: IPCOM000047767D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Halbeisen, RA: AUTHOR [+3]

Abstract

This article relates generally to thermal print heads and more particularly to heat sinks for such print heads which reduce or eliminate burn-out of the print head mesas due to hot spots. In attaching heat sinks to commercially available thermal print heads, voids between the heat sink surface and the back of the print head are often present due to the fact that the heads are not perfectly flat. In many instances, the voids are too large to fill with a thermally conductive heat-sink grease and local hot-spots occur leading to mesa burn-out. This problem may be solved by providing a highly heat-conductive spacer between the print head assembly and an associated support bracket which conforms to the print head surface. Fig.

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Conformable Thermal Print Heat Sink

This article relates generally to thermal print heads and more particularly to heat sinks for such print heads which reduce or eliminate burn-out of the print head mesas due to hot spots. In attaching heat sinks to commercially available thermal print heads, voids between the heat sink surface and the back of the print head are often present due to the fact that the heads are not perfectly flat. In many instances, the voids are too large to fill with a thermally conductive heat-sink grease and local hot-spots occur leading to mesa burn-out. This problem may be solved by providing a highly heat-conductive spacer between the print head assembly and an associated support bracket which conforms to the print head surface. Fig. 1A shows a conformable heat sink spacer 1 in the form of a mesh cylinder of copper or other suitable thermally conductive material filled with a high temperature heat sink grease. Spacer 1 is then flattened slightly and installed between the back of a print head assembly 2 and a cast support bracket 3, as shown in Fig. 1B, by means of screws and holes present in each of the foregoing elements. Any irregularities or gaps that would have existed are now in contact with less compressed portions of mesh spacer 1. In addition, the mesh of spacer 1 insures that the grease does not separate and form gaps, thereby eliminating hot spots which could lead to burn-out of mesas 4.

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