Browse Prior Art Database

Conversion of Emulsion Masks to Chrome Masks

IP.com Disclosure Number: IPCOM000092398D
Original Publication Date: 1967-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Chand, N: AUTHOR

Abstract

Commercially available photographic film or plates can be used to prepare chrome masks suitable for high-volume production of printed circuits and memory work. The process is carried out by, first, exposing and developing a high-resolution photographic film or glass plate to form the desired positive pattern image. The exposed silver or black areas of the film or plate are removed with a suitable etchant, such as EB2 or EB3, products of Eastman Kodak Co., thus leaving a silver emulsion or a gelatin layer in the unexposed areas.

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Conversion of Emulsion Masks to Chrome Masks

Commercially available photographic film or plates can be used to prepare chrome masks suitable for high-volume production of printed circuits and memory work. The process is carried out by, first, exposing and developing a high-resolution photographic film or glass plate to form the desired positive pattern image. The exposed silver or black areas of the film or plate are removed with a suitable etchant, such as EB2 or EB3, products of Eastman Kodak Co., thus leaving a silver emulsion or a gelatin layer in the unexposed areas.

A layer of chromium metal is then deposited by vacuum deposition over the entire plate surface. The chromium-plated substrate is then soaked in hypochlorite bleach or other suitable solvent for removing the remaining gelatin and overlying chromium layer. The chromium layer remains on the areas where it coats the bare substrate.

The process can be used with commercially available photographic film or plates. Thus it does not require the use of photoresist and associated equipment commonly used in making chrome masks.

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