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US 7,125,154 B2Granted
Backlighting apparatus
AssigneePhlox
InventorChristophe Blanc
Life of this patent
Estimating the term…
Abstract
Disclosed is a lightguide in the form of a plate (1), a first surface of which is provided with first straight parallel grooves (8) (diffusing the light circulating in the guide). The inventive lightguide is characterized by the fact that it is provided with second straight parallel grooves (9) (diffusing the light circulating in the guide) which extend in an oblique direction, particularly in an orthogonal direction, relative to the first grooves such that the guide diffuses in a uniform manner the light that is introduced into the guide via three or four edges thereof.
Claims16
Lighting device that comprises:
- a lightguide comprising a plate (1,12), comprising at least two opposed side edges (4,6), one face (3) of which has first irregular diffusing patterns (8) formed in the plate,
- two light sources (13,14) arranged along two opposed side edges of the plate,
- at least one third light source arranged along a third side edge of the plate,
- second irregular diffusing patterns formed in the plate crosscrossing with the first diffusing patterns,
- each diffusing pattern comprising a groove (10) bordered by two strips of irregular projections and depressions,
- each diffusing pattern having irregularities in surface area and depth,
- the grooves of the first diffusing patterns being spaced apart at varying distances, and
- the grooves of the second diffusing patterns being spaced apart at varying distances.
5 more elements
Lightguide, comprising:
- a plate (1,12) having two parallel faces (2,3) and at least two opposed side edges (4,6), with a first face (3) having a plurality of first irregular elongate diffusing patterns (8,10) formed in the plate, wherein,
- said lightguide comprises second irregular elongate diffusing patterns (9,10) formed in the plate and crisscrossing the first diffusing patterns,
- the first and second diffusing patterns comprising grooves (10) bordered by two strips of projections and depressions,
- each groove having irregularities in depth and an irregular transverse profile,
- the grooves of the first diffussion patterns being spaced apart at varying distances, and
- the grooves of the second diffusing patterns being spaced apart at vary distances.
3 more elements
Dependencies are inferred from the claim text.