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公开(公告)号：US3585121A
公开(公告)日：1971-06-15
申请号：US3585121D
申请日：1968-11-14
Applicant: NAT RES DEV
Inventor： FRANKS ALBERT , LINDSEY KEVIN
CPC classification number: G21K1/06 , G02B5/1838 , G02B5/1857 , G21K2201/067
Abstract: A METHOD OF MAKING DIFFRACTION GRATINGS, PARTICULARLY X-RAY DIFFRACTION GRATINGS, IN WHICH THOSE PARTS OF THE GRATING THAT FORM THE BOTTOMS OF DIFFRACTING GROOVES BELOW THE GENERAL OPTICALLY SMOOTH SURFACE OF THE GRATING ARE SUBJECTED TO AN ELECTRICAL ETCHING PROCESS.
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