NDLI: Process for the production of star tracklng [tracking] reticles

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Process for the production of star tracklng [tracking] reticles

Content Provider	NASA Technical Reports Server (NTRS)
Copyright Year	1972
Description	A method for the production of reticles, particularly those for use in outer space, wherein the product is a quartz base coated with highly adherent layers of chromium, chromium-silver, and silver vacuum deposited through a mask, and then coated with an electrodeposit of copper from a copper sulfate solution followed by an electrodeposit of black chromium. The masks are produced by coating a beryllium-copper alloy substrate with a positive working photoresist, developing the photoresist according to a pattern to leave a positive mask, plating uncoated areas with gold, removing the photoresist, coating the substrate with a negative working photoresist, developing the negative working photoresist to expose the base metal of the pattern, and chemically etching the unplated side of the pattern to produce the mask. The mask produced is then used in the vacuum deposition of: (1) chromium metal on the surface of a quartz base to obtain a highly adherent quartz-chromium interface; (2) silver on the chromium deposit, during the final stage of chromium deposit, to produce a silver chromium alloy layer; and (3) silver onto the surface of the alloy layer. The coated quartz base is then coated by electroplating utilizing an acid copper deposit followed by a black chromium electrodeposit to produce the product of the present invention.
File Size	2929136
Page Count	5
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20160001127
Archival Resource Key	ark:/13960/t0vq7q32f
Language	English
Publisher Date	1972-11-14
Access Restriction	Open
Subject Keyword	Reticles Patents Etching Electroplating Quartz Masks Substrates Silver Beryllium Alloys Metal Surfaces Copper Alloys Star Trackers Chromium Photoresists Electrodeposition Copper Vacuum Deposition Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Patent

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