Browse Prior Art Database

Automated Green Sheet Editor

IP.com Disclosure Number: IPCOM000038729D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Cerniglia, TJ: AUTHOR [+4]

Abstract

This article describes a machine assembly which includes (1) a laser for line deleting (2) an extrusion tool to repair screened lines (3) a laser inspection head (4) robotic handlers and an X-Y table and (5) a motion controller and microprocessor. In very high density circuit patterns found on multilayer ceramic substrates, pattern modifications cannot be done repeatedly by hand under a microscope. The disclosed machine permits the precise positioning of the pattern under the pattern modification and inspection heads. The thermal conductivity of the circuit lines and pads is sub stantially higher than the substrate material. This differential is important to the precise circuit modification capabilities of the disclosed machine.

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Automated Green Sheet Editor

This article describes a machine assembly which includes (1) a laser for line deleting (2) an extrusion tool to repair screened lines (3) a laser inspection head
(4) robotic handlers and an X-Y table and (5) a motion controller and microprocessor. In very high density circuit patterns found on multilayer ceramic substrates, pattern modifications cannot be done repeatedly by hand under a microscope. The disclosed machine permits the precise positioning of the pattern under the pattern modification and inspection heads. The thermal conductivity of the circuit lines and pads is sub stantially higher than the substrate material. This differential is important to the precise circuit modification capabilities of the disclosed machine. The pulsing of the laser in the delete head is adjusted to the proper energy level and repetition rate to produce the desired melting and deletion (hot plate) effect of a spot portion of the circuit pattern, without damaging the substrate material. With the precise positioning capability of the machine, the laser energy can be applied incrementally to obtain the best results without the risk of ablation. The machine assures that the X and Y positions of the pattern under the delete head remain fixed and the Z axis distance of the head to the pattern does not vary during the delete process step. This permits good repeatability in the pattern modification mode. The machine also contains a remotely controlled ext...