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Manufacture of Circuit Boards Utilizing Electroerosion and an Automatic Drafting Table

IP.com Disclosure Number: IPCOM000086091D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Uberbacher, E: AUTHOR

Abstract

The use of the ADL (Automatic Drafting Layout) artwork generating computer program has greatly shortened the time cycle required to obtain the artwork for circuit boards. The introduction of the electroerosion process into the automatic drafting table further shortens the cycle, by eliminating the photographic and etching process utilized in making circuit boards.

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Manufacture of Circuit Boards Utilizing Electroerosion and an Automatic Drafting Table

The use of the ADL (Automatic Drafting Layout) artwork generating computer program has greatly shortened the time cycle required to obtain the artwork for circuit boards. The introduction of the electroerosion process into the automatic drafting table further shortens the cycle, by eliminating the photographic and etching process utilized in making circuit boards.

An electroerosion head 10 is utilized to replace the ink pen on the drafting table. The erosion head vaporizes copper from the circuit board 12 as the drafting table drive system 14, 16 moves the head 10. The control modifications required are shown in block diagram form in Fig. 1. The interface 18 consists generally of a circuit card which accepts the table motor activating signals 20, and turns the erosion head motor 22 when a change in direction of the erosion head 10 is required.

The line width is varied in the same manner as the pen selection for the conventional automatic drafting table. For example, in the present drafting system, a pen size instruction causes the pen turret to rotate until the correct pen size is in the writing position. This pen size instruction would be utilized in the electroerosion system to select the number of electrodes to be powered.

Referring to Fig. 2, it can be seen that the electroerosion head 10 produces the desired copper line on the copper-clad circuit card, by eroding the coppe...