Plastic article or earthenware shaping or treating: apparatus – Means forming a mold; or flask – per se
Patent
1997-05-14
1999-09-28
Vargot, Mathieu D.
Plastic article or earthenware shaping or treating: apparatus
Means forming a mold; or flask, per se
249116, 216 24, 216 54, 264 25, 427585, 427135, 425808, 425810, B29C 3338
Patent
active
059584696
ABSTRACT:
A method for producing diffractive optic molding tools with improved durability is accomplished by depositing a layer of chromium carbide on a substrate material. This layer of chromium carbide becomes the receptor for a final machinable coating such as electroless nickel. The pattern for the desired diffractive surface is predetermined and a single-point-diamond turning machine is used to cut the negative of this predetermined pattern into the machinable layer to produce the pattern of concentric zones to the required depths. The pattern is then uniformly etched in the machinable layer down into the intermediate layer of chromium carbide resulting in the complete removal of all of the electroless nickel. In that the etching rates of electroless nickel and chromium carbide differ from one another, it is necessary to dimensionally adjust the negative pattern turned into the electroless nickel surface to allow for the different etch rates. In such manner, an extremely durable molding surface of chromium carbide is achieved.
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Bocchetti Mark G.
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Vargot Mathieu D.
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