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US 9,322,515 B2Granted
Apparatus for controlling the re-distribution of light emitted from a light-emitting diode
AssigneeKorry Electronics Co.
InventorsJohn R. Green, Stephen H. Humphrey, Andrew B. Leslie, Timothy R. Robinson
Life of this patent
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Abstract
A system for re-distributing light emitted from a light source using an optical element is described. The optical element is manufactured using a bulk matrix material, and diffusing particles and/or scattering particles are embedded within the bulk material. The optical element is coupled to the light source to capture emitted light and redistribute the light in a desired angular distribution pattern depending on the ratio of total weight of diffusing particles to total weight of scattering particles.
Claims24
A system, comprising:
- a source configured to emit electromagnetic radiation having a first angular distribution pattern;
- an optical element coupled to the source, wherein the optical element comprises a bulk material, a first type of particle substantially uniformly distributed throughout the bulk material, and a second type of particle substantially uniformly distributed throughout the bulk material, wherein the first type of particle has a first concentration by weight within the bulk material, and the second type of particle has a second concentration by weight within the bulk material, and further wherein the optical element has a shape that captures the first angular distribution pattern and emits a second angular distribution pattern;
- wherein the first and second angular distribution patterns provide a light distribution pattern with a light distribution uniformity between 0.6 and 1.4, the light distribution uniformity is given by:
- U
- =
- ∫
- -
- 110
-
- °
- -
- 130
-
- °
-
- I
-
- ⅆ
- θ
- +
- ∫
- 110
-
- °
- 130
-
- °
-
- I
-
- ⅆ
- θ
- 2
-
- ∫
- -
- 10
-
- °
- 10
-
- °
-
- I
-
- ⅆ
- θ
- ,
- wherein I corresponds to emitted intensity in a given direction.
46 more elements
A system, comprising:
- a light-emitting element;
- an optical element coupled to the light emitting element, wherein the optical element is embedded substantially uniformly with a first type of particle without a gradient in concentration by weight of the first type of particle, the optical element is embedded substantially uniformly with a second type of particle without a gradient in concentration by weight of the second type of particle, and further wherein the optical element captures the light emitted by the light emitting element and re-emits the light in a distribution pattern that provides a light distribution pattern with a light distribution uniformity between 0.6 and 1.4, the light distribution uniformity is given by:
- U
- =
- ∫
- -
- 110
-
- °
- -
- 130
-
- °
-
- I
-
- ⅆ
- θ
- +
- ∫
- 110
-
- °
- 130
-
- °
-
- I
-
- ⅆ
- θ
- 2
-
- ∫
- -
- 10
-
- °
- 10
-
- °
-
- I
-
- ⅆ
- θ
- ,
- wherein I corresponds to emitted intensity in a given direction.
45 more elements
A system, comprising:
- a light-emitting element;
- a solid optical element coupled to the light emitting element, wherein the optical element is formed from a bulk material, the bulk material is embedded throughout with a first type of particle, the bulk material is embedded throughout with a second type of particle, and further wherein the optical element captures the light emitted by the light emitting element and re-emits the light in a quasi-isotropic distribution pattern;
- wherein the quasi-isotropic distribution pattern has a light distribution uniformity between 0.6 and 1.4, and further wherein the light distribution uniformity is given by
- U
- =
- ∫
- -
- 110
-
- °
- -
- 130
-
- °
-
- I
-
- ⅆ
- θ
- +
- ∫
- 110
-
- °
- 130
-
- °
-
- I
-
- ⅆ
- θ
- 2
-
- ∫
- -
- 10
-
- °
- 10
-
- °
-
- I
-
- ⅆ
- θ
- ,
- wherein I corresponds to emitted intensity in a given direction.
46 more elements
A method of simulating a light emission distribution of an incandescent light bulb, comprising:
- generating light with a light-emitting diode (LED), wherein the LED only emits light in a forward direction;
- capturing the generated light with an optical element embedded substantially uniformly with a first type of particle having a first concentration by weight within the solid optical element
- re-emitting at least some of the captured light in a distribution pattern, wherein the distribution pattern includes emission in a backward direction outside the solid optical element;
- wherein the distribution pattern has a light distribution uniformity between 0.6 and 1.4, the light distribution uniformity is given by:
- U
- =
- ∫
- -
- 110
-
- °
- -
- 130
-
- °
-
- I
-
- ⅆ
- θ
- +
- ∫
- 110
-
- °
- 130
-
- °
-
- I
-
- ⅆ
- θ
- 2
-
- ∫
- -
- 10
-
- °
- 10
-
- °
-
- I
-
- ⅆ
- θ
- ,
- wherein I corresponds to emitted intensity in a given direction.
47 more elements
A method of simulating a light emission distribution of an incandescent light bulb, comprising:
- generating light with a light emitting element, wherein the light emitting element only emits light in a forward direction;
- means for capturing the generated light with an optical element, wherein a first type of particle and a second type of particle are distributed substantially uniformly without a gradient in concentration throughout the optical element;
- means for re-emitting at least some of the captured light in a distribution pattern, wherein the distribution pattern includes emission in a backward direction;
- and
- wherein the distribution pattern has a light distribution uniformity between 0.6 and 1.4, the light distribution uniformity is given by:
- U
- =
- ∫
- -
- 110
-
- °
- -
- 130
-
- °
-
- I
-
- ⅆ
- θ
- +
- ∫
- 110
-
- °
- 130
-
- °
-
- I
-
- ⅆ
- θ
- 2
-
- ∫
- -
- 10
-
- °
- 10
-
- °
-
- I
-
- ⅆ
- θ
- ,
- wherein I corresponds to emitted intensity in a given direction.
48 more elements
A method of changing a distribution of emitted electromagnetic radiation from a source, comprising:
- generating electromagnetic radiation with a source;
- capturing the generated radiation with an optical element embedded with a first type of particle substantially uniformly distributed throughout the optical element without a gradient in concentration, and further wherein the optical element is embedded throughout with a second type of particle substantially uniformly throughout the entire optical element without a gradient in concentration;
- re-emitting at least some of the captured light in a distribution pattern, wherein the distribution pattern is substantially uniform over a surface;
- and
- wherein the distribution pattern has a light distribution uniformity between 0.6 and 1.4, the light distribution uniformity is given by:
- U
- =
- ∫
- -
- 110
-
- °
- -
- 130
-
- °
-
- I
-
- ⅆ
- θ
- +
- ∫
- 110
-
- °
- 130
-
- °
-
- I
-
- ⅆ
- θ
- 2
-
- ∫
- -
- 10
-
- °
- 10
-
- °
-
- I
-
- ⅆ
- θ
- ,
- wherein I corresponds to emitted intensity in a given direction.
48 more elements
An apparatus, comprising:
- a solid optical element formed from a bulk material, wherein the optical element has a shape that captures electromagnetic radiation emitted from a source in a first angular distribution pattern and re-distributes the electromagnetic radiation in a second angular distribution pattern;
- a plurality of scattering particles, wherein the plurality of scattering particles are dispersed substantially uniformly throughout the bulk material, wherein the scattering particles have a first concentration by weight within the bulk material;
- and
- a plurality of diffusing particles, wherein the plurality of diffusing particles are dispersed substantially uniformly with a second concentration by weight throughout the bulk material, wherein the diffusing particles have a second concentration by weight within the bulk material;
- wherein the first and second angular distribution patterns provide a light distribution pattern with a light distribution uniformity between 0.6 and 1.4, the light distribution uniformity is given by
- U
- =
- ∫
- -
- 110
-
- °
- -
- 130
-
- °
-
- I
-
- ⅆ
- θ
- +
- ∫
- 110
-
- °
- 130
-
- °
-
- I
-
- ⅆ
- θ
- 2
-
- ∫
- -
- 10
-
- °
- 10
-
- °
-
- I
-
- ⅆ
- θ
- ,
- wherein I corresponds to emitted intensity in a given direction.
48 more elements
A system, comprising:
- a source configured to emit electromagnetic radiation having a first angular distribution pattern;
- a solid optical element coupled to the source, wherein the optical element is formed from a bulk material, and a first type of particle is distributed with a first concentration by weight throughout the bulk material, and a second type of particle is distributed with a second concentration by weight throughout the bulk material and further wherein the optical element has a shape that captures the first angular distribution pattern and emits a second angular distribution pattern;
- wherein the first and second angular distribution patterns provide a light distribution pattern with a light distribution uniformity between 0.6 and 1.4, and further wherein the light distribution uniformity is given by
- U
- =
- ∫
- -
- 110
-
- °
- -
- 130
-
- °
-
- I
-
- ⅆ
- θ
- +
- ∫
- 110
-
- °
- 130
-
- °
-
- I
-
- ⅆ
- θ
- 2
-
- ∫
- -
- 10
-
- °
- 10
-
- °
-
- I
-
- ⅆ
- θ
- ,
- wherein I corresponds to emitted intensity in a given direction.
46 more elements
Dependencies are inferred from the claim text.