Browse Prior Art Database

Step and Repeat Contact Printer

IP.com Disclosure Number: IPCOM000096108D
Original Publication Date: 1964-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 78K

Publishing Venue

IBM

Related People

Rothauser, A: AUTHOR

Abstract

This step and repeat contact printer permits the contact printing of fine line printed circuit patterns to close tolerances. It reproduces line thicknesses of 0.005 inch with width tolerances of +/- 0.0001 inch up to a length of seventy-two inches, and line-to-line spaces of 0.004 inch with a tolerance of +/- 0.0001 inch. Line-to-line mismatch can be held to 0.0005 inch, not accumulative, over the length of the line. The bow in the pattern is 0.001 inch maximum over the full length of the line.

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Step and Repeat Contact Printer

This step and repeat contact printer permits the contact printing of fine line printed circuit patterns to close tolerances. It reproduces line thicknesses of
0.005 inch with width tolerances of +/- 0.0001 inch up to a length of seventy-two inches, and line-to-line spaces of 0.004 inch with a tolerance of +/- 0.0001 inch. Line-to-line mismatch can be held to 0.0005 inch, not accumulative, over the length of the line. The bow in the pattern is 0.001 inch maximum over the full length of the line.

At A, light source 1 contained in housing 2 directs a beam of light onto mirror
3. This is an off-axis section of a parabolic mirror with a surface accuracy of one-tenth wavelength and a ten inch diameter. Reflected parallel rays of light 4 are directed by mirror 3 through master plate 5 having pattern 6 to be printed on glass plate 7. The latter has a photosensitive emulsion on its upper surface.

After an initial exposure, master plate 5 is removed and chase 8 with another master plate associated with it is inserted. Chase 8 is moved along straight edge 9, and is indexed by placing stepping pin 10, shown at 13, in a selected hole 11 in chase 8 and in a selected matching hole 12 in stepping bar 13. Air cylinder 14 is then actuated to push chase 8 firmly against straight edge 9 so that positioning pins 15 accurately hold chase 8 in correct alignment. The chase 8 is lowered into firm contact with the photosensitized glass plate 7.

The procedur...