Light fixture, light aperture and method of uniformly illuminating an optically diffusive viewing area
Patent 4335421 Issued on June 15, 1982. Estimated Expiration Date: 
March 17, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 17, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorsApplicationNo. 06/130743 filed on 03/17/1980US Classes:362/223, With or including transparent or translucent member359/629, By partial reflection at beam splitting or combining surface359/850, Plural mirrors or reflecting surfaces362/125, WITH SHOWCASE OR SHOW WINDOW362/260, Fluorescent type362/290, Louvered or grid type modifier362/297, With or including plural, distinct reflecting surfaces362/298, Opposed362/300, With or including translucent or transparent modifier362/301, With or including planar reflecting surface362/302, With or including coaxial reflecting surfaces362/307, With or including translucent or transparent modifier362/342, Louvered or grid type362/343, With diverse modifier362/346, Plural separate reflectors or separate sections362/97, LIGHT TABLE-TYPE ILLUMINATOR40/361, PHOTOGRAPHIC TRANSPARENCY VIEWER, E.G., X-RAY VIEWER40/367With internal light sourceExaminersPrimary: Gron, Teddy S.Attorney, Agent or FirmInternational ClassesF21V 3/00 (20060101)F21V 3/04 (20060101) F21V 13/00 (20060101) G09F 13/08 (20060101) F21S 8/00 (20060101) F21V 11/00 (20060101) F21V 11/12 (20060101) F21V 13/10 (20060101) G09F 13/10 (20060101) AbstractA light fixture having an optically diffusive viewing element having a viewing area across which apparent uniform brightness is achieved from a conventional light source and reflector by utilization of a light aperture. The light aperture comprises a tralucent substrate to which a plurality of reflective surfaces are affixed so as to partially redirect light incident thereon back to the reflector. Apparent uniform brightness of the light fixture viewing area is derived by a unique method of dividing the light from the light source into varying portions of direct and indirect illumination through the light aperture as well as direct illumination from the light source and indirect reflection from the reflector to the viewing area.Field of SearchLIGHT TABLE-TYPE ILLUMINATORWITH SHOWCASE OR SHOW WINDOW With or including transparent or translucent member Fluorescent type Louvered or grid type modifier With or including plural, distinct reflecting surfaces Opposed With or including translucent or transparent modifier With or including planar reflecting surface With or including coaxial reflecting surfaces With or including translucent or transparent modifier Louvered or grid type With diverse modifier | |
