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Glass Alignment Evaluation Technique

IP.com Disclosure Number: IPCOM000108612D
Original Publication Date: 1992-Jun-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 2 page(s) / 77K

Publishing Venue

IBM

Related People

Klodowski, MJ: AUTHOR [+2]

Abstract

Disclosed is a technique which can be utilized to access the layer-to- layer alignment of two similar glass plates. The technique is required to evaluate the ability of a circuit card lay-up tool to accurately align one circuit layer to another. The tool, the Enhanced Manual Lay-up Tool (IBM Tool #9963215-AA) is used to align, glue and stack circuit layers just prior to a stack lamination process. This article describes a technique which is used to evaluate the Enhanced Manual Lay-up Tool's accuracy of performing its required function.

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Glass Alignment Evaluation Technique

       Disclosed is a technique which can be utilized to access
the layer-to- layer alignment of two similar glass plates. The
technique is required to evaluate the ability of a circuit card
lay-up tool to accurately align one circuit layer to another.  The
tool, the Enhanced Manual Lay-up Tool (IBM Tool #9963215-AA) is used
to align, glue and stack circuit layers just prior to a stack
lamination process.  This article describes a technique which is used
to evaluate the Enhanced Manual Lay-up Tool's accuracy of performing
its required function.

      The technique involves the use of two glass plates with given
alignment feature pairs 3 at predetermined locations (see the
figure).  The top glass plate 1 features consist of six circles
(diameter = 0.150 mm) and the bottom glass plate 2 features consist
of six rings (inner diameter = 0.200 mm, outer diameter = 0.300 mm).
When the two glass plates are identically aligned, the six circles
are concentric to the six rings.

      The glass plates are then loaded into the Enhanced Manual Tool
sequentially.  This tool optically acquires the video image of each
of two lay-up features 4 on both glass plates.  The glass plates are
then glued together using a cyanoacrylate adhesive applied at each
corner of the glass plates.  The adhesive is water soluble so that
the plates can be eventually separated and reused if desired.

      Once the glass plates are aligned, glued and stacked, the stack
alignment accuracy is now evaluated.  This is...