Composite lens with diffusion
AssigneeCree, Inc.
InventorsGerald H. Negley, Paul Pickard
Life of this patent
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Abstract
The present disclosure relates to an enhanced composite lens, which is formed from a material, such as thermoplastic material. The thermoplastic material may be polycarbonate, acrylic glass, and the like. To form the composite lens, a resin of the desired thermoplastic material is formed in the desired shape of a lens. To facilitate light diffusion within the body of the resultant lens, diffusive additives are added to the thermoplastic resin when forming the composite lens. As such, the diffusive additives are dispersed throughout the body of the composite lens and light diffusion occurs volumetrically within and throughout the body of the composite lens.
Claims30
A composite lens that provides diffusion for a lighting fixture comprising a material formed in a shape of a lens and a diffusive additive distributed substantially throughout the material wherein a color shift of light passing through the lens is associated with a Δu′v′ of less than about 0.004, wherein Δu′v′ is defined as Δu′v′=|u′before, v′before−u′after, v′after| where u′before, v′before are chromaticity coordinates of light before passing through the lens and u′after, v′after are chromaticity coordinates of light after passing through the lens.
A composite lens that provides diffusion for a lighting fixture comprising a material formed in a shape of a lens and a diffusive additive distributed substantially throughout the material wherein a color shift of light passing through the lens is associated with a ΔV′ of less than about 0.003, wherein Δv′ is defined as Δv′=|V′before−v′after|where v′before is a chromaticity coordinate of light before passing through the lens and v′after is a chromaticity coordinate of light after passing through the lens.
A composite lens that provides diffusion for a lighting fixture comprising a material formed in a shape of a lens and a diffusive additive distributed substantially throughout the material wherein a color shift of light passing through the lens is associated with a Δu′ of less than about 0.003, wherein Δu′ is defined as Δu′=|u′before−u′after| where u′before is a chromaticity coordinate of light before passing through the lens and u′after is a chromaticity coordinate of light after passing through the lens.
A solid state lighting fixture comprising a composite lens and an LED-based light source wherein light emitted from the LED-based light source is directed through the composite lens, and the composite lens comprises a material formed in a shape of a lens and a diffusive additive distributed substantially throughout the material wherein a color shift of light passing through the lens is associated with a Δu′v′ of less than about 0.004, wherein Δu′v′ is defined as Δu′v′=|u′before, v′before−uafter, v′after| where u′before, v′before are chromaticity coordinates of light before passing through the lens and u′after, v′after are chromaticity coordinates of light after passing through the lens.
Dependencies are inferred from the claim text.