# US 5,702,662 A · Process for ablating high density vias in flexible substrate

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- Number: US 5,702,662 A
- Document ID: US5702662A
- Status: Granted
- Kind: A
- Application number: 08/536,863
- Filed: 1995-09-29
- Granted: 1997-12-30
- Earliest claimed: 1995-09-29
- Assignees: Litel Instruments
- Inventors: Adlai H. Smith; Robert O. Hunter, Jr.; Bruce McArthur; Steven Blair; Jim Wilkinson
- Web page: https://patentgrep.com/patent/US5702662A

## CPC

- H05K 3/0026: {by laser ablation}
- B23K 26/066: by using masks
- H05K 1/0393: {Flexible materials (H05K1/038 takes precedence; specific organic compositions are classified in H05K1/0313 and subgroups)}
- H05K 2203/056: Using an artwork, i.e. a photomask for exposing photosensitive layers
- H05K 2203/1545: Continuous processing, i.e. involving rolls moving a band-like or solid carrier along a continuous production path
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM

## Abstract

A apparatus and process for ablating a matrix of high density vias in a flexible substrate. The apparatus is cantilevered on a horizontal shelf from a partition where it can be rigidly supported. A vacuum container reciprocates towards and away from the partition and supports the horizontal shelf by permitting supporting casters to bear on and be supported by the reciprocating container. When the container is away from the partition, servicing of the apparatus as well as the insertion an removal of substrate can occur. When the container is adjoined to the partition, a vacuum can be drawn on the apparatus and processing commenced. A continuous flexible substrate is provided extending in a circuitous path between a supply roll and a take up roll, all interior of the container. The flexible substrate is maintained under constant tension and incrementally advanced. The substrate is incrementally advanced and stopped, passing across a table. When the roll is advanced, the table releases the substrate and is cleaned of the debris resulting form previous ablations. When the roll is stopped, the table clamps and precisely levels the substrate for sequential ablation of the substrate.

## Claims

### Claim 1

A process for ablating a matrix of high density vias in a substrate comprising the steps of:
providing a continuous flexible substrate;
providing a mask having subapertures, which subapertures when scanned produce at a working distance from the mask an array of working images for ablating a corresponding array of vias in the substrate;
providing a table for registering the substrate at the working distance from the mask;
incrementally advancing and stopping the continuous flexible substrate over the table;
providing a vacuum over the table and substrate;
scanning the mask with coherent light to ablate the substrate over the table when the substrate is stopped to ablate the matrix of vias in the substrate in a vacuum; and,
while maintaining the vacuum, removing debris from the table after the ablating step.

### Claim 2 (depends on 1)

A process for ablating a matrix of high density vias in a substrate according to claim 1 and wherein the step of:
providing a continuous flexible substrate includes incrementally advancing a continuous flexible substrate from a supply roll to a take up roll.

### Claim 3 (depends on 1)

A process for ablating a matrix of high density vias in a substrate according to claim 1 and wherein the step of:
removing debris from the table after the ablating step includes providing the table with a plurality of flat surface members; and,
tilting the flat surface members after each ablation to discharge debris on the table.

### Claim 4 (depends on 1)

A process for ablating a matrix of high density vias in a substrate according to claim 1 and including the step of:
cooling the table.

### Claim 5 (depends on 1)

A process for ablating a matrix of high density vias in a substrate according to claim 1 and wherein the step of:
scanning the mask with coherent light includes scanning the mask with two beams of coherent light.

### Claim 6 (depends on 5)

A process for ablating a matrix of high density vias in a substrate according to claim 5 and wherein the step of:
scanning the mask with coherent light includes alternating the two beams of coherent light.