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Producing Accurately Located Well Defined Holes in Fired Ceramin

IP.com Disclosure Number: IPCOM000077766D
Original Publication Date: 1972-Sep-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Archey, WB: AUTHOR [+3]

Abstract

A two-step process may be used for very accurate placement and rapid formation of holes in a fired ceramic substrate. First, small pilot, holes are formed at the desired locations using a gas, e.g., CO(2), laser. The pilot holes are then reamed to final size (e.g., 20/1000 inch) by drilling with a diamond tipped bit. A numerical control unit and X-Y table is desirably used, both for the laser pilot hole formation and for the diamond drilling operation.

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Producing Accurately Located Well Defined Holes in Fired Ceramin

A two-step process may be used for very accurate placement and rapid formation of holes in a fired ceramic substrate. First, small pilot, holes are formed at the desired locations using a gas, e.g., CO(2), laser. The pilot holes are then reamed to final size (e.g., 20/1000 inch) by drilling with a diamond tipped bit. A numerical control unit and X-Y table is desirably used, both for the laser pilot hole formation and for the diamond drilling operation.

To prevent cratering on the drill exit side of the ceramic, the pilot holes are reamed from both sides. This is conveniently done by reversing the numerical control tape and turning the substrate over, to produce a mirror-image pattern of that obtained with the tape in its original direction on the first side of the substrate.

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