Browse Prior Art Database

SOFTWARE CONTROLLED PHOTOPLOTTING DATA

IP.com Disclosure Number: IPCOM000006971D
Original Publication Date: 1993-Jun-01
Included in the Prior Art Database: 2002-Feb-13
Document File: 3 page(s) / 108K

Publishing Venue

Motorola

Related People

George Printzis: AUTHOR

Abstract

The software package provides a conversion from Mentor Graphics Gerber and Aperture Table data to a format which is ready for use by the Fire9000, Gptronics, PCGerber, Lavenir 386, or Excellon ETC2000 plotters. The program will translate the aperture shapes and ther- mal reliefs according to the specific plotter format.

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INC. Technical Developments Volume 19 June 1993

0 M MO-LA

SOFlWARE CONTROLLED PHOTOPLOTTING DATA

by George Printzis

   The software package provides a conversion from Mentor Graphics Gerber and Aperture Table data to a format which is ready for use by the Fire9000, Gptronics, PCGerber, Lavenir 386, or Excellon ETC2000 plotters. The program will translate the aperture shapes and ther- mal reliefs according to the specific plotter format.

  The existing problem with the Aperature Table is that data is currently typed manually by the photoplotter operator. Typing errors can occur and, in some cases, are diflicult to detect. For example, consider a case where the CAD database assigns a ,012" aperture and the photoplotter operator types .OlO!' This error is almost impossible to detect. In the past, many photoplots have been rejected because the supplier did not interpret the aperture table correctly, resulting in project delays. In addition, components with larger leads have a higher amount of current passing through the junction. As a result, the spoke width and thermal relief, which deter- mines the conductivity, must be larger according to the diameter.

  An aperture definition table for the Fine 9000 plot- ter usually consists of several lines formatted as "GO4%Annn;descr2;descr3.%*"-this will vary depending on the plotter type. The "G04%" and "00"' delimiters serve to make the table transparent to plotters that do not support aperture definitions in the current format. The "Annn" is the aperture number (10 to 999); and the "descr2,descr3" are descriptors.

  The descriptors consist of a sign (+ or -) and a three letter keyword. The sign determines whether the desctip- tar is added or subtracted from the aperture. The descrip- tor is added to the aperture ifthe sign is positive and the descriptor is subtracted from the aperture if the sign is negative. The three-letter keyword determines the...