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US 6,685,341 B2Granted
Light fixture having a multilayer polymeric film
Assignee3M Innovative Properties Company
InventorsAndrew J. Ouderkirk, Michael F. Weber
Life of this patent
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Abstract
A light-emitting apparatus includes a light source, such as a fluorescent lamp, and a multilayer mirror wrapped partially around the light source. The multilayer mirror includes alternating layers of at least a first layer type containing a first polymeric material and a second layer type containing a second polymeric material, the layers having refractive index properties the differences of which satisfy a predetermined relationship.
Claims6
A light-emitting apparatus, comprising in combination:
- a light source;
- and
- a multilayer mirror wrapped partially around the light source, the multilayer mirror comprising alternating layers of at least a first layer type comprising a first polymeric material and a second layer type comprising a second polymeric material, wherein a difference in indices of refraction between the two layer types is Δx along a first in-plane axis, Δy along a second in-plane axis perpendicular to the first in-plane axis, and Δz along a third axis mutually orthogonal to the first and second axes, and wherein |Δz| is less than about 0.5 k, where k is the larger of |Δx| and |Δy|.
The apparatus of any of claims 2-4, wherein the mirror has a reflectivity of greater than 99%.
Dependencies are inferred from the claim text.