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US 10,472,770 B2Granted
Element for manipulating light
AssigneeCarl Freudenberg KG
InventorsRudolf Wagner, Guenter Frey, Klaus Marek, Armin Greiner, Jochen Bialek
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Abstract
A wet-laid nonwoven having a1) 5-50 wt % matrix fibers and a2) 50-95 wt % at least partially thermally fused binding fibers or b1) 50-80 wt % matrix fibers and b2) 20-50 wt % binders, can be used as a light distributing element.
Claims14
A light diffusion element comprising a wet-laid nonwoven comprising:
- a1) 5-20 wt % of matrix fibers;
- and
- a2) 80-95 wt % of at least partly thermally fused binding fibers, based on the total weight of the nonwoven,
- wherein the matrix fibers comprise not less than 5 wt % of microfibers having an average linear density of less than 1 dtex, based on a total amount of fibers,
- wherein the binding fibers comprise sheath-core fibers, and
- wherein the fused binding fibers form regions acting as light reflection areas at some or all fiber-fiber crossing points in the nonwoven which are spherical or akin to stretched sails.
3 more elements
A light source, comprising:
- an illuminant;
- and
- a light diffusion element comprising a wet-laid nonwoven comprising:
- a1) 5-20 wt % of matrix fibers;
- and
- a2) 80-95 wt % of at least partly thermally fused binding fibers, based on the total weight of the nonwoven,
- wherein the matrix fibers comprise not less than 5 wt % of microfibers having an average linear density of less than 1 dtex, based on a total amount of fibers,
- wherein the binding fibers comprise sheath-core fibers, and
- wherein the fused binding fibers form regions acting as light reflection areas at some or all fiber-fiber crossing points in the nonwoven which are spherical or akin to stretched sails.
6 more elements
Dependencies are inferred from the claim text.