Light emitting device with heat conducting fluid
AssigneeSignify Holding B.V.
InventorsAlbertus Adrianus Smits, Dmitri Anatolievich Chestakov, Hendrik Jan Eggink, Ralph Theodorus Hubertus Maessen
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Abstract
The invention relates to a light emitting device, comprising at least one light source (101) and a closed container, the container comprising a first area (105) and a second area (107) that is arranged opposite to the first area (105), the closed container being filled with a heat conducting fluid (111) that is thermally coupled to an inside surface of the closed container, wherein the at least one light source (101) is arranged on an outside surface (115) of the first area of the closed container and thermally coupled to the inside surface (113) of the closed container.
Claims16
A light emitting device, comprising at least one light source and a closed container, the closed container comprising a first area and a second area that is arranged opposite to the first area, the closed container including a cavity being filled with a heat conducting fluid that is thermally coupled to an inside surface of the closed container, wherein the at least one light source is arranged on an outside surface of the first area of the closed container that is outside of said cavity and thermally coupled to the inside surface of the closed container, wherein:
- the container comprises a first tubular vessel as the first area and a second tubular vessel as the second area, the second tubular vessel surrounding the first tubular vessel at a distance larger than zero mm, and wherein the space between the first tubular vessel and the second tubular vessel is filled with the heat conducting fluid, or
- an optical refractive index of the heat conducting fluid is greater than an optical refractive index of at least one of the first area or the second area;
- and
- wherein the heat conducting fluid has a Grashof number in the range between 5·108-3·1010.
A light emitting device, comprising at least one light source and a closed container, the closed container comprising a first area and a second area that is arranged opposite to the first area, the closed container being filled with a heat conducting fluid that is thermally coupled to an inside surface of the closed container, wherein the at least one light source is arranged on an outside surface of the first area of the closed container and thermally coupled to the inside surface of the closed container, wherein the heat conducting fluid has a Grashof number in the range between 5·108-3·1010.
A heat sink for a light emitting device, comprising a closed container, the closed container comprising a first area and a second area that is arranged opposite to the first area, the closed container including a cavity being filled with a heat conducting and optically transparent fluid that is thermally coupled to an inside surface of the closed container, wherein at least one light source of the light emitting device is arranged on an outside surface of the first area of the closed container that is outside of said cavity, wherein:
- the container comprises a first tubular vessel as the first area and a second tubular vessel as the second area, the second tubular vessel surrounding the first tubular vessel at a distance larger than zero mm, and wherein the space between the first tubular vessel and the second tubular vessel is filled with the heat conducting fluid, or:
- an optical refractive index of the heat conducting fluid is greater than an optical refractive index of at least one of the first area or the second area;
- and
- wherein the heat conducting fluid has a Grashof number in the range between 5·108-3·1010.
Dependencies are inferred from the claim text.