Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1977-01-31
1978-05-30
Edmundson, F.C.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204 15, 204297W, C25D 1706
Patent
active
040922340
ABSTRACT:
A method of producing a diffraction grating master which comprises exposing a plurality of reduced first grating patterns on a light sensitive layer in conformance with a predetermined code; processing the light sensitive layer to produce first gratings therein; exposing a plurality of reduced second grating patterns on the light sensitive layer (superimposed on the first gratings) and repeating the processing step to produce the second gratings; vacuum depositing a layer of silver on the superimposed first and second gratings; electroplating a layer of nickel on the silver layer on the superimposed gratings; separating the resulting nickel-silver layer from the light sensitive layer; and reinforcing the nickel-silver layer (formed in the pattern of the first and second gratings) for use as an embossing master. A special electroplating fixture used in the electroplating step insures that the nickel layer being deposited lies flat without "peeling".
REFERENCES:
patent: 2675348 (1954-04-01), Greenspan
patent: 2852463 (1958-09-01), Gutzmer
patent: 3414502 (1968-12-01), Porrata et al.
patent: 3824176 (1974-07-01), Crowe
Horst William R.
McNaughton James L.
Mort Charles F.
Cavender J. T.
Edmundson F.C.
NCR Corporation
Sessler Jr. Albert L.
Wargo Elmer
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