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Double Contact Printing Exposure Frame

IP.com Disclosure Number: IPCOM000075348D
Original Publication Date: 1971-Sep-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Salvas, WA: AUTHOR

Abstract

This exposure frame permits simultaneous and precise photographic contact printing of both sides of a photoresist coated foil substrate 10. Two glass photoplates 12 and 14, or other imaged material, are bonded in permanent alignment and secured in fixture 16 by three set screws 18, one over each bond point. The image is shown at 19.

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Double Contact Printing Exposure Frame

This exposure frame permits simultaneous and precise photographic contact printing of both sides of a photoresist coated foil substrate 10. Two glass photoplates 12 and 14, or other imaged material, are bonded in permanent alignment and secured in fixture 16 by three set screws 18, one over each bond point. The image is shown at 19.

A 1/4 rotation of hand wheel 20 operates cams 22 and 24 against lift bar 26 so as to bend top photoplate 12 to an open position, (1/8'' for 4'' x 5'' x 0.060'' glass photoplates). A workpiece is inserted by a flat vacuum pickup tool. A 1/4 turn of hand wheel thus lowers top photoplate 12. A vacuum applied at port 28 evacuates air in the area designated 30 and draws the photoplates against the workpiece. Light from the upper and lower light sources contact prints the top and bottom patterns simultaneously.

Photoplates 12 and 14 are prepared for assembly by application to one photoplate of a seal 32 which has an adhesive surface on one side. Three shims 34 are positioned and then the upper photoplate is placed over the lower photoplate. The shims 34 and seal 32 are of same thickness as the workpiece. After patterns are aligned, liquid cement (methyl-2 cyanoacrylate) is applied at the edge of each shim, and drawn between the photoplates by capillary action, thus bonding the assembly together. Seal 36 secures the photoplates to fixture 16, and the opening 38 admits light to the bottom of the workpiec...