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Browse Prior Art Database

Applications of Victoria Blue in Thick Film (paste) Substrate Manufacturing

IP.com Disclosure Number: IPCOM000062778D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Anschel, M: AUTHOR [+2]

Abstract

The addition of Victoria blue dye to a glass paste overlay, which is used in the construction of a thick film substrate, improves the dimensional control and allows an easier inspection of critical steps. The manner in which the dye is used is described in the following.

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Applications of Victoria Blue in Thick Film (paste) Substrate Manufacturing

The addition of Victoria blue dye to a glass paste overlay, which is used in the construction of a thick film substrate, improves the dimensional control and allows an easier inspection of critical steps. The manner in which the dye is used is described in the following.

An alumina ceramic (Fig. 1a) is circuitized with conductive paste (Fig. 1b). The conductor 2 is selectively overlaid with two glass pastes layer 1 and layer 2, as seen in Fig. 1d. Layer 1 paste is used to prevent solder from wetting selected circuit lines, i.e., to prevent bridging. Layer 2 paste serves to define those portions of the circuit (fingers) which are to be chip attached, i.e., provide a glass dam for controlled collapse chip connector (C-4) pads. Dimensional control for the fingers is critical. Thus, the placement of layer 2 paste, which defines the finger length, requires accuracy.

Without a dye in the paste it is difficult to achieve proper placement of the glass and to inspect parts for defects.

The structure of Victoria blue is seen in Fig. 2.

Disclosed anonymously.

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