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Multilayer Grid Print Method for Checking

IP.com Disclosure Number: IPCOM000081776D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Franklin, RH: AUTHOR

Abstract

This method permits circuit artwork images to be applied in plural differently colored transparent layers over a fixed-grid format, in such a way that internal dimensions can be referenced to external (grid) dimensions: 1) A precision grid is transferred photographically or by photoetching to a suitably receptive medium (photopaper, receptive plastic, metal surface, glass or ceramic in green or processed form). 2) A lueco diazo coating is applied over the grid. 3) The diazo coating receives image exposure to actinic radiation. 4) The exposed image is developed (with ammonia vapor or water depending on the material used) and dyed with a suitably transparent colored dye. 5) For each additional contrasting film image to be added steps 2-4 are repeated, in image registry, using a different dye color.

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Multilayer Grid Print Method for Checking

This method permits circuit artwork images to be applied in plural differently colored transparent layers over a fixed-grid format, in such a way that internal dimensions can be referenced to external (grid) dimensions:
1) A precision grid is transferred photographically or by

photoetching to a suitably receptive medium (photopaper,

receptive plastic, metal surface, glass or ceramic in

green or processed form).
2) A lueco diazo coating is applied over the grid.
3) The diazo coating receives image exposure to actinic

radiation.
4) The exposed image is developed (with ammonia vapor or

water depending on the material used) and dyed with a

suitably transparent colored dye.
5) For each additional contrasting film image to be added

steps 2-4 are repeated, in image registry, using a

different dye color. In steps 2 - 5 a transfer key

may be used instead of photographic or photolithographic

methods. Another alternative, especially useful on

green ceramic, is to provide a coating of PVA or egg

albumen plus sensitizer (e.g., ammonium dichromate

or potassium dichromate), plus dye processed as above.

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