Compact, light efficient, illuminated transparency frame

Details Compact, light efficient, illuminated transparency frame Compact, light efficient, illuminated transparency frame

1992-12-01

1994-03-15

Lee, John D.

Optical waveguides

Miscellaneous

40547, 362 32, 385901, G02B 600

Patent

active

052952215

ABSTRACT:
A frame (20), for illuminating a depiction on a transparency (50) with full illumination or with highlighting, shadowing and dramatic illumination, includes a front panel (36), a back panel (38), a bottom lens panel (40), a top panel (42) and pair of side panels (44). Each panel includes its own light guiding groove arrangement of a SCOTCH.TM. optical lighting film (SOLF) (50, 70, 88, 108, 126, 146, 160) and whole portions or segments of a light extractor film (84, 98, 104, 136, 156, 158) for either directing the light from a fluorescent bulb (48) along the SOLF light guides or into patterns of light onto and through transparency (50). The SOLF grooves transmit the light in the direction of double headed arrows (78) in bottom lens panel (40) toward side panels (44), which direct the light as shown by double headed arrows (96). The grooves in top panel (42), as portrayed by double headed arrow lines (116) guide the light in a wrapped arround manner between front and back panels (36, 38). Grooves (132, 152, 64) in respective back panels (38a, , 38b) and in front panel (36) extend between top panel (42) and bottom lens panel (40). Grooves (76) in bottom lens panel (40) direct light parrallel to the axis of the flourescent bulb (46) while all other grooves, including light wrap-around grooves (114) in top panel (42), direct light perpendicular to the bulb axis.

REFERENCES:
patent: 4260220 (1981-04-01), Whitehead
patent: 4615579 (1986-10-01), Whitehead
patent: 5138783 (1992-08-01), Forsse
"3M Scotch.TM. Optical Lighting Film Application Bulletin Thin Light Box" (11 pages), No. 75-0299-6017-8, dated Nov. 1988, Special Enterprises Program, 3M Traffic Control Materials Division.
"3M Scotch.TM. Optical Lighting Film Assembly Instructions Thin Light Box Inserts" (4 pages), No. 75-0299-6016-0, dated Nov. 1988, Special Enterprises Program, 3M Traffic Control Materials Division.
"Scotchlamp Film.TM." (12 pages), No. 78-6970-2773-4, undated Special Enterprises Dept., 3M Traffic Control Materials Div.
"3M Scotch.TM. Optical Lighting Film General Theory" (8 pages), No. 75-0299-6018-6, dated Nov. 1988, Special Enterprises Program, 3M Traffic Control Materials Division.
"3M Scotch.TM. Optical Lighting Film Specification Sheet" (3 pages), No. 75-0299-5727-3, dated Nov. 1988, Special Enterprises Program, 3M Traffic Control Materials Division.
"Product Bulletin V-5115" entitled Scotch.TM. Light Extractor Film V-5115 (2 pages), No. 75-5100-0145-8, dated Jul. 1989, 3M Commercial Graphics Division.
"Product Information Scotchmark.RTM. Identification Systems" entitled Scotch.TM. 467MP and 468MP Laminating Adhesives (4 pages), No. 70-0701-2468-3, Converter Specialties Division/3M (undated).
"Progress in the development of prism light guides" by Steven G. Saxe, Lorne A. Whitehead and Sanford Cobb, Jr., Proceedings of the Society of Photo-optical Instrumentation Engineers (SPIE), vol. 692, pp. 235-240 (Aug. 1986).
3M publication entitled "3M Brand Scotch Lamp Film.TM." (3 pages), undated.
3M publication entitled "3M Brand Scotch Lamp Film.TM." (4 pages), undated.

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