Light box

Details Light box Light box

1989-07-25

1991-01-29

Hart, Douglas

Illumination

Display backlight

Lcd backlight

362225, 362256, 362346, G09F 1304, F21V 704

Patent

active

049891227

ABSTRACT:
A light box particularly adapted to back-light posters which includes a housing having a back wall, a peripheral wall and an opening opposite the back wall; a diffuser panel spanning the opening, an elongated lamp within the housing adjacent the peripheral wall for emitting radiation from the lamp peripherally inward toward the back wall and the diffuser panel, and first and second reflector surfaces respectively adjacent and more remote from the lamp with the first reflector surface having reflecting capabilities which are less then the reflecting capabilities of the second reflector surface. The lamp has material contiguous thereto for preventing emitted radiation directed from the lamp directly toward the diffuser panel from impinging upon the diffuser panel whereby bright spots on the back-lit poster are eliminated and the poster is back-lit uniformly over its area.

REFERENCES:
patent: 2295994 (1942-09-01), Howe
patent: 2529713 (1950-11-01), Thurston
patent: 4536830 (1985-08-01), Wisniewski
patent: 4630895 (1986-12-01), Abdala

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