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Browse Prior Art Database

Fine Line Deletion

IP.com Disclosure Number: IPCOM000073594D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

McNutt, RD: AUTHOR

Abstract

Thin conductive lines 1 on a substrate 2 of a circuit module 3 are severed by tool 4 without scratching or damaging surface 5 of the substrate. The tool is spring loaded by spring 6. As the tool is lowered onto severable segment 7 of a particular line 8, the spring imposes a set pressure upon the tool cutting edges 9. This causes the edges to penetrate the line to a depth just short of the substrate surface 10.

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Fine Line Deletion

Thin conductive lines 1 on a substrate 2 of a circuit module 3 are severed by tool 4 without scratching or damaging surface 5 of the substrate. The tool is spring loaded by spring 6. As the tool is lowered onto severable segment 7 of a particular line 8, the spring imposes a set pressure upon the tool cutting edges 9. This causes the edges to penetrate the line to a depth just short of the substrate surface 10.

Segment 7 is prepared in advance to have poor adhesion to the substrate surface. Therefore, as the 45 degrees-angled inner surfaces 12 of the tool cutting edge penetrate into the segment, the segment material is pressured inward. As a result, the segment arches upward as it is being cut leaving a clean separation between the line and the substrate surface.

The segment can now be removed by application of vacuum or mechanical means adjacent to the cut segment. Outside faces 14 of the cutting edge are made vertical to prevent disturbance of the material of the line exclusive of the cut segment and circuit elements connected thereto.

Typical line thickness and tool cutting edge spacing dimensions are 0.0007 and 0.008 inch, respectively. To hold tolerances, the tool part containing the cutting edges 9 is coupled to spring 6 through a separate part 18 which provides an inwardly tapered bearing surface conforming to the conically tapered upper end of the part 16 and a shoulder to receive the spring. Thus, spring force components other than tho...