Card – picture – or sign exhibiting – Photographic transparency viewer – e.g. – x-ray viewer
Patent
1997-04-21
1999-11-30
Green, Brian K.
Card, picture, or sign exhibiting
Photographic transparency viewer, e.g., x-ray viewer
40564, 362 97, 362331, 359641, G02B 2702
Patent
active
059920661
ABSTRACT:
Apparatus for illuminating medical diagnostic imaging film comprises a light source for projecting light toward the imaging film, and a plurality of light diffusion film layers positioned in close adjacent relationship with one another, between the imaging film and the light source. Each of the diffusion film layers has a specified index of refraction, and the diffusion layers collectively act to scatter the projected light. An optical adhesive having an index of refraction which is substantially equal to the diffusion film index of refraction is positioned between respective adjacent surfaces thereof to substantially eliminate air-filled spaces therebetween, and to bond the film diffusion layers together into a unitary light diffusion structure. A plurality of layers of microprism film are positioned between the light diffusion film and the imaging film for redirecting at least a portion of the scattered light into a beam of collimated light directed to illuminate the imaging film.
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