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Spaced Glass Printed Circuit Board

IP.com Disclosure Number: IPCOM000091221D
Original Publication Date: 1969-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Franck, DR: AUTHOR [+2]

Abstract

Printed circuit boards are commonly constructed of a matrix of resin such as epoxy and a fiber such as glass for introducing mechanical strength and stability. The glass fibers are characteristically very hard and abrasive and add to drill wear and breakage when holes are drilled in the laminate structure. To overcome the problem of drilling holes, this method comprises separating the glass fibers prior to the drilling operation in the areas where drilling is to occur. For example, if a .020 inch hole 10 is to be placed in a predetermined area of the laminate 11, the glass mat in that area is separated to an approximately .040 inch hole or slightly greater. After laminating and curing, the areas to be drilled consist only of an epoxy and are readily drilled.

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Spaced Glass Printed Circuit Board

Printed circuit boards are commonly constructed of a matrix of resin such as epoxy and a fiber such as glass for introducing mechanical strength and stability. The glass fibers are characteristically very hard and abrasive and add to drill wear and breakage when holes are drilled in the laminate structure. To overcome the problem of drilling holes, this method comprises separating the glass fibers prior to the drilling operation in the areas where drilling is to occur. For example, if a .020 inch hole 10 is to be placed in a predetermined area of the laminate 11, the glass mat in that area is separated to an approximately .040 inch hole or slightly greater. After laminating and curing, the areas to be drilled consist only of an epoxy and are readily drilled.

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