High-frequency raster with irregular structure of raster element

Details High-frequency raster with irregular structure of raster element High-frequency raster with irregular structure of raster element

1975-12-24

1977-04-19

Robinson, Ellis P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

65 31, 350162R, 350314, 350321, 428410, B32B 300, C03C 1500, C03C 2506

Patent

active

040189589

ABSTRACT:
What is proposed is a high-frequency raster with an irregular structure of raster elements. This raster is a plane-parallel glass plate with transparent roughnesses on its surface characterized by a value Ra equal to 0.20-0.26 mu.
The high-frequency raster with an irregular structure of raster elements is preferably prepared by a method in which a glass plate is ground at two sides to obtain a uniform structure of the surface. The ground plate is subjected to etching to obtain transparent microroughnesses with a value Ra equal to 0.20-0.26 mu.
The raster proposed by the present invention is characterized by a high resolving power in the order of 25 mm.sup.-.sup.1, transmits a normal interval of optical densities of 1.0 to 1.2 and is capable of reproducing an image with a finely grained discrete structure.

REFERENCES:
patent: 2189988 (1940-02-01), Lester
patent: 2370214 (1945-02-01), Walker
patent: 2670279 (1954-02-01), Szegho
patent: 2999013 (1961-09-01), Meth
patent: 3374130 (1968-03-01), Junge
patent: 3527628 (1970-09-01), Fullerton
patent: 3647583 (1972-03-01), De Rouw
patent: 3813568 (1974-05-01), Scott

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