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公开(公告)号：US3669673A
公开(公告)日：1972-06-13
申请号：US3669673D
申请日：1970-10-23
Applicant: RCA CORP
Inventor： IH CHARLES CHUNG SEN , LURIE MICHAEL JAY
CPC classification number: G02B5/1842 , G03H1/02 , G03H2001/187 , Y10S359/90
Abstract: A RECORDING MEDIUM BLANK IS EMPLOYED COMPRISING A SUBSTRATE HAVING A DIFFRACTION GRATING, COMPOSED OF A PLURALITY OF SPACED LINE RIDGES, ON A SURFACE THEREOF, TOGETHER WITH A PHOTORESIST DISPOSED ON THIS SURFACE WHICH FILLS THE SPACES BETWEEN ADJACENT LINE RIDGES. THIS PROVIDES A SUBSTANTIALLY SMOOTH EXTERIOR SURFACE OF THE PHOTORESIST WHICH IS SITUATED IN PROXIMITY WITH THE RESPECTIVE TOPS OF THE LINE RIDGES MAKING UP THE DIFFRACTION GRATING. BY EXPOSING SUCH A RECORDING BLANK TO A FOCUSED IMAGE OF ANY COMPLEX OBJECT AND THEN DEVELOPING THE PHOTORESIST, A DIFFRACTION GRATING WITH MODULATED EFFICIENCY IS FORMED, CONSTITUTING A SYNTHETIC FOCUSED IMAGE HOLOGRAM; WHICH DISPLAYS THE ORIGINAL FOCUSED IMAGE WHEN PROPERLY VIEWED. A STAMPING MASTER, WHICH CAN BE PREPARED FROM THIS MODULATED GRATING RECORD, IS USEFUL IN EMBOSSING REPLICATIONS ON THERMOPLASTIC MATERIAL, SUCH AS VINYL FOR INSTANCE.
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