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Multilayer Ceramic Screening Mask

IP.com Disclosure Number: IPCOM000047042D
Original Publication Date: 1983-Sep-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Coleman, SF: AUTHOR

Abstract

The production of multilayer ceramic substrates employs screening masks through which molybdenum patterns are screened on ceramic green sheets. It has been found that the longevity of the screening masks as well as the yield of usable masks may be increased dramatically by moving the screening masks fused area outside the fiducial areas, as described below. Fig. 1 illustrates a green sheet screening mask 10 as has been heretofore employed for screening molybdenum patterns on ceramic green sheets. Screening mask 10 includes two metal layers 11 and 12, fused together at 14. Screen layer 11 includes a screening mesh 15, while pattern layer 12 includes the particular pattern 16 which is to be screened on the green sheet.

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Multilayer Ceramic Screening Mask

The production of multilayer ceramic substrates employs screening masks through which molybdenum patterns are screened on ceramic green sheets. It has been found that the longevity of the screening masks as well as the yield of usable masks may be increased dramatically by moving the screening masks fused area outside the fiducial areas, as described below. Fig. 1 illustrates a green sheet screening mask 10 as has been heretofore employed for screening molybdenum patterns on ceramic green sheets. Screening mask 10 includes two metal layers 11 and 12, fused together at 14. Screen layer 11 includes a screening mesh 15, while pattern layer 12 includes the particular pattern 16 which is to be screened on the green sheet. Fiducials 13 are stamped through layers 11 and 12 in fused area 14 so that fiducial lines may be screened on the green sheet. Referring to Fig. 2, it has been found that when fused area 14 is moved outside the fiducials 13, the screening mask 10 has a longer usable life, and fiducial lines are more accurately placed on the green sheet. Longer life is obtained because the silk screening head no longer passes over the fused area 14, so that the fused area is not weakened or rippled. More accurate placement of fiducial lines is obtained because the fiducial lines are not affected by irregularities caused by fused area 14, so that fiducial line bleeding is minimized. Thus, multilayer ceramic substrate production throughp...