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Browse Prior Art Database

Grid Overlay

IP.com Disclosure Number: IPCOM000095406D
Original Publication Date: 1964-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Frankola, F: AUTHOR [+2]

Abstract

This grid overlay facilitates the conversion of drawings for printed circuit masks from one scale to a larger scale. The enlarged drawing is employed in a photographic reduction process to fabricate printed circuit masks of precise dimensions. This system eliminates dimensioning on engineering drawings and reduces the work time in fabricating artwork and mask by a factor of four to one.

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Grid Overlay

This grid overlay facilitates the conversion of drawings for printed circuit masks from one scale to a larger scale. The enlarged drawing is employed in a photographic reduction process to fabricate printed circuit masks of precise dimensions. This system eliminates dimensioning on engineering drawings and reduces the work time in fabricating artwork and mask by a factor of four to one.

An original drawing 10 at a preselected scale is prepared by a draftsman. The drawing describes a circuit or other configuration which is the basis of a mask for an additive or subtractive printed circuit process. Typically, but not exclusively, the circuit configuration is made at a 20:1 scale. The drawing is converted to a 40:1 scale or like by grid overlay 15. This has a series of coordinate locations having assigned numbers. Overlay 15 is superimposed on drawing 10. An operator reads the coordinates of various points 11, 12 and 13 in the circuit of drawing 10.

The points in the 20:1 drawing are converted to 40:1 drawing points by the coordinates read from the overlay. The operator tabulates the various 20:1 points and corresponding 40:1 coordinates. The tabulation is employed as the basis of reproducing the original drawing at a 40:1 scale. A second grid overlay, not shown, includes 40:1 coordinates to check the converted coordinates placed on the 40:1 drawing.

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