Card – picture – or sign exhibiting – Photographic transparency viewer – e.g. – x-ray viewer
Patent
1996-03-04
1998-11-17
Davis, Cassandra H.
Card, picture, or sign exhibiting
Photographic transparency viewer, e.g., x-ray viewer
353 38, G02B 2702
Patent
active
058360964
ABSTRACT:
View box apparatus is provided for illuminating a film containing a medical diagnostic image for radiologic observation and study. A light source is contained within the view box, at one end thereof, and a transparent plate is positioned at the other end for supporting the imaging film. A panel of material is positioned in the box between the light source and the transparent plate to diffuse light from the source, and one or more layers of a microprism film is positioned between the diffuser panel and the imaging film. The microprism film layer reflects light rays which are incident thereon at an angle less than a critical angle back into the view box, so that such light rays do not pass through the microprism film to illuminate the imaging film. Light rays incident upon the microprism film which are greater than the critical angle are refracted by the microprism film, to provide light for illuminating the imaging film having a solid angle which is much less than the solid angle of light from the diffuser. Accordingly, the microprism film serves to substantially reduce scatter, and thereby significantly improves resolution and contrast for an observer of the imaging film.
REFERENCES:
patent: 5056912 (1991-10-01), Hamada et al.
patent: 5150138 (1992-09-01), Nakanishi et al.
patent: 5187599 (1993-02-01), Nakanishi et al.
patent: 5313726 (1994-05-01), Yaniv et al.
patent: 5315330 (1994-05-01), Hamada
patent: 5381187 (1995-01-01), Takamatsu et al.
patent: 5398125 (1995-03-01), Willett et al.
patent: 5594830 (1997-01-01), Winston et al.
Letter to the Editor: "Contrast and Signal-to-Noise Ratio in Radiographic Images," Radiology, vol. 188, No. 3. Letter from Kevin J. Robson, BSc, C. John Kotre, BSc,MSc, and Keith Faulkner, BSc, MSc, PhD (Sep. 1993) pp. 878-880.
Abildgaard & Notthellen; "Increasing Contrast When Viewing Radiographic Images," Radiology, Nov. 1992, 185:475-478.
Feder, "Where Repetition Is Exciting: 3M Is Betting on Tiny Shapes Tightly Packed," New York Times, Business Section, Nov., 1995.
"3M Brightness Enhancement Film (BEF)" (Supplied by 3M Company) Copyright 1993.
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