Photocopying – Miscellaneous
Patent
1980-08-11
1981-09-01
Griffin, Donald A.
Photocopying
Miscellaneous
250237G, 356374, G03B 2700, G01B 1114, H01J 314
Patent
active
042868718
ABSTRACT:
An electro-optical measuring system in a photogrammetric comparator or stereocompiler comprises a visible light transparent phase grating which is carried upon a surface of the photo support plate of the device. The grating is formed as a composite layer of .lambda./4 films of at least two dielectric materials of different refractive index which are deposited on the support in such a manner as to yield parallel bands in which the two film materials are in alternating sequence from band to band. As a result of this structure which ensures a constant physical and optical thickness with respect to transmitted imaging light over the whole granting pattern, image-degrading diffraction of the transmitted visible light is avoided, yet the grating pattern provides interfering diffraction in reflection which may be utilized in a precise displacement measuring system.
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patent: 3877810 (1975-04-01), Feldstein
patent: 4176276 (1979-11-01), Kaul et al.
Griffin Donald A.
Keuffel & Esser Company
White Lionel N.
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