Coated diffuser cap for LED illumination device
AssigneeTSMC Solid State Lighting Ltd.
InventorsChih-Hsuan Sun, Wei-Yu Yeh, Pei-Wen Ko, Hsueh-Hung Fu
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Abstract
The present disclosure provides an illumination device. The illumination device comprises a light-emitting diode (LED) device on a substrate, a heat sink and a cap. The heat sink is thermally connected to the LED device. The cap is secured over the substrate and covering the LED device. The cap includes a coating material having diffusion and reflection characteristics, and the coating material is free of being in direct contact with the LED device. The coating material is applied on a first portion of an inner surface of the cap, but not on a second portion of the inner surface of the cap.
Claims20
An illumination device comprising:
- a light-emitting diode (LED) device on a substrate;
- a heat sink thermally connected to the LED device;
- a cap secured over the substrate and covering the LED device, wherein the cap includes a coating material that comprises both diffusion and reflection characteristics, and wherein the coating material is free of being in direct contact with the LED device, and wherein the coating material is applied on a first portion of an inner surface of the cap, and wherein a second portion of the inner surface of the cap is free of the coating material.
A light bulb comprising:
- a light-emitting diode (LED) device on a substrate;
- a cap secured over the substrate and covering the LED device, wherein the cap has a spherical shape with a relatively narrow neck portion extending towards the LED device, wherein a width of the cap is less than a height of the cap;
- and
- a diffusion lens that is disposed over the substrate and houses the LED device within, wherein the diffusion lens is disposed underneath the cap, and wherein a coating material is applied to a selected portion of an inner surface of the diffusion lens, wherein the selected portion is smaller than the inner surface;
- wherein the diffusion lens comprises at least one material selected from the group consisting of polycarbonate (PC) and poly methyl methacrylate (PMMA);
- and
- wherein the coating material includes a resin mixed with TiO2.
An illumination device comprising:
- a light-emitting diode (LED) device on a substrate;
- a heat sink thermally connected to the LED device;
- a cap secured over the substrate and covering the LED device, wherein the cap includes a coating material that comprises both diffusion and reflection characteristics;
- wherein:
- a width of the cap is greater than a height of the cap;
- the cap has an inverted trapezoid shape or an ellipsoid shape;
- the coating material is applied on a selected segment of an inner surface of the cap, the selected segment being smaller than the inner surface;
- and
- the coating material is spaced apart from the LED device by a gap.
Dependencies are inferred from the claim text.