Browse Prior Art Database

Screened Ceramic Compensators

IP.com Disclosure Number: IPCOM000034429D
Original Publication Date: 1989-Feb-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Humenik, JN: AUTHOR [+2]

Abstract

It is proposed to eliminate substantial differences in fired height variations on multilayer ceramic substrates. In developing the structure, those sites with the lower heights would be elevated beneath their base so as to make their final height roughly equivalent to those sites which are normally higher. Non-planarities occur over sections of the substrate where there are few via columns to act as vertical supports during sintering. Typically, a substrate 1 (Fig. 1) would have chip sites 2 higher than channels 4 between the chip sites and EC vias. The proposal suggests a method to prevent the ceramic from sinking in the areas not supported by via columns by adding a filler material in those areas. The filler would be made of the same material as the green sheet 5 (Fig.

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Screened Ceramic Compensators

It is proposed to eliminate substantial differences in fired height variations on multilayer ceramic substrates. In developing the structure, those sites with the lower heights would be elevated beneath their base so as to make their final height roughly equivalent to those sites which are normally higher. Non- planarities occur over sections of the substrate where there are few via columns to act as vertical supports during sintering. Typically, a substrate 1 (Fig. 1) would have chip sites 2 higher than channels 4 between the chip sites and EC vias. The proposal suggests a method to prevent the ceramic from sinking in the areas not supported by via columns by adding a filler material in those areas. The filler would be made of the same material as the green sheet 5 (Fig. 2) and would be applied by screening under the channels 7 between the chip sites and EC vias. The development deals with the localized effect by preventing its occurrence. The added material tends to compensate for the localized increase in shrinkage and raises the height of the depressions to that of the surrounding region. The method is relatively simple, requiring only screening masks, paste, and an extra screening process.

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