Optical device and system for solid-state lighting
First Claim
1. An optical device for transforming an input light distribution from a solid-state light-emitting device (LED) light source to provide an omni-directional output light distribution, the optical device comprising:
- a conical body of an optically-transparent material comprising an inner cone surface and an outer cone surface surrounding a longitudinal axis;
the inner and outer cone surfaces converging coaxially from a base of the conical body to a convexly rounded tip at an apex of the conical body for transmitting light upwardly therethrough, and defining an outer cone of the optically-transparent material, having a first refractive index n1, and an inner cone comprising a cavity containing a transparent optical medium of a second refractive index nz, wherein n1>
n2;
the inner cone having a diameter (d) at the base of the conical body for coupling to a light-emitting surface of the LED light source and receiving therefrom a predetermined input light distribution;
the inner cone surface comprising an inner grating structure comprising a first plurality of conical facets, and a first plurality of cylindrical spacing facets parallel to the longitudinal axis;
the outer cone surface comprising an outer grating structure comprising a second plurality of conical facets, and a second plurality of cylindrical spacing facets parallel to the longitudinal axis;
said first and second plurality of conical facets extending upwardly from the first and second cylindrical spacing facets, respectively, and tapering inwardly towards the apex of the conical body, and cone angles of the first and second plurality of conical facets being configured to reshape the predetermined input light distribution from the LED light source and generate an omni-directional output light distribution.
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Accused Products
Abstract
An optical device for transforming an input light distribution from an LED light source to provide an omni-directional output light distribution for solid-state lighting is disclosed. The optical device has a conical form, comprising first and second coaxial cones of different refractive index, defined by coaxial inner and outer cone surfaces, which converge from a cone base to a rounded tip at the apex. Preferably, each of the inner and outer cone surfaces comprises a plurality of conical facets defining a grating structure. The inner cone, i.e. air cavity, is directly coupled to an LED emitter area. Cone angles and spacings of conical facets, defining inner and outer gratings, are tailored to reshape a predetermined input light distribution. Apertures assist in heat dissipation. A lightweight, compact device with high transmission efficiency can be manufactured at low cost by one-step injection molding from an optical-grade polymer, such as PMMA.
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Citations
18 Claims
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1. An optical device for transforming an input light distribution from a solid-state light-emitting device (LED) light source to provide an omni-directional output light distribution, the optical device comprising:
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a conical body of an optically-transparent material comprising an inner cone surface and an outer cone surface surrounding a longitudinal axis; the inner and outer cone surfaces converging coaxially from a base of the conical body to a convexly rounded tip at an apex of the conical body for transmitting light upwardly therethrough, and defining an outer cone of the optically-transparent material, having a first refractive index n1, and an inner cone comprising a cavity containing a transparent optical medium of a second refractive index nz, wherein n1>
n2;the inner cone having a diameter (d) at the base of the conical body for coupling to a light-emitting surface of the LED light source and receiving therefrom a predetermined input light distribution; the inner cone surface comprising an inner grating structure comprising a first plurality of conical facets, and a first plurality of cylindrical spacing facets parallel to the longitudinal axis; the outer cone surface comprising an outer grating structure comprising a second plurality of conical facets, and a second plurality of cylindrical spacing facets parallel to the longitudinal axis; said first and second plurality of conical facets extending upwardly from the first and second cylindrical spacing facets, respectively, and tapering inwardly towards the apex of the conical body, and cone angles of the first and second plurality of conical facets being configured to reshape the predetermined input light distribution from the LED light source and generate an omni-directional output light distribution. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification