Title: Method of fabricating diffraction grating masters and apparatus therefor

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".

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Inventors: Horst, William R. (Dayton, OH, US)
McNaughton, James L. (Kettering, OH, US)
Mort, Charles F. (Xenia, OH, US)

Application Number: 611377
Filing Date: 1975-09-08
Publication_date: 1977-08-30
Assignee: NCR Corporation (Dayton, OH)
Primary Class(es): 228/176 29/458, 264/2.5, 430/394
Other Classes:
US Patent Ref:

2444314	Jun, 1948	Ruggieri	425/810.
2875543	Mar, 1959	Sylvester et al.	264/1.
3045531	Jul, 1962	Prescott	350/162.
3388735	Jun, 1968	Sayce	96/38.
3484154	Dec, 1969	Swing et al.	96/38.
3619024	Nov, 1971	Frattarola	264/1.
3917378	Nov, 1975	Gale	350/3.

Other Refs:
Primary Examiner: Jones, Jr., James L.
Assistant Examiner: Ramsey, K. J.
Attorney: Cavender; J. T., Sessler, Jr.; Albert L., Wargo; Elmer