Browse Prior Art Database

Use of Pressure to Control Relative Placement of Mask and Green Sheet on MLC Screener

IP.com Disclosure Number: IPCOM000043774D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Eve, JL: AUTHOR [+5]

Abstract

The present system for engaging a green sheet nest against a fixed screening mask is shown schematically in Fig. 1. The nest 10 is intentionally moved up a precise fixed distance toward the mask 12 by hydraulic actuation. Prior to this move, however, an additional fine adjustment ("Z"), entered into the system under operator control, is superimposed on the hydraulic action, its amount dictated by mask type and condition requirements. An overload spring 14 in the shaft 16 prevents machine damage due to malfunction. Fig. 2 illustrates the modification to the multilayer ceramic (MLC) screener apparatus here disclosed. The displacement control system shown in Fig. 1 has been replaced by a load pressure sensor 18 located between the shaft 16 and the green sheet nest 10, as shown in Fig. 2.

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Use of Pressure to Control Relative Placement of Mask and Green Sheet on MLC Screener

The present system for engaging a green sheet nest against a fixed screening mask is shown schematically in Fig. 1. The nest 10 is intentionally moved up a precise fixed distance toward the mask 12 by hydraulic actuation. Prior to this move, however, an additional fine adjustment ("Z"), entered into the system under operator control, is superimposed on the hydraulic action, its amount dictated by mask type and condition requirements. An overload spring 14 in the shaft 16 prevents machine damage due to malfunction. Fig. 2 illustrates the modification to the multilayer ceramic (MLC) screener apparatus here disclosed. The displacement control system shown in Fig. 1 has been replaced by a load pressure sensor 18 located between the shaft 16 and the green sheet nest 10, as shown in Fig. 2. Actuator shaft motion continues to move the nest toward the mask until a preset load pressure limit value (voltage response) is reached, at which time any further forward motion ceases on the part of the nest. This change increases screening yields, increases mask life, and obviates the need for an overload spring.

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