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US 7,828,453 B2Granted
Light emitting device and lamp-cover structure containing luminescent material
AssigneeNepes LED Corporation
InventorsNguyen The Tran, Yongzhi He, Frank Shi
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Abstract
An LED lamp cover structure containing luminescent material, its fabrication methods, and an LED package using the LED lamp cover are disclosed. The LED lamp cover is comprised of a first lens cap providing the outer surface of the lamp cover, a second lens cap providing the inner surface of the lamp cover, and an encapsulating layer sandwiched between the first and second lens caps. The lamp cover of the invention covering a color LED package such as blue color can provide white light output.
Claims14
A lamp cover structure, comprising:
- a first lens cap providing the outer surface of said lamp cover structure and a cavity at the inner surface;
- a second lens cap providing the inner surface of said lamp cover structure;
- and
- a wavelength-conversion layer sandwiched between said first lens cap and said second lens cap, wherein the inner surface of said lamp cover structure has different curvatures or different normal vector planes thereon such that the light emitted from a point on the inner surface of said lamp cover structure is recaptured by said lamp cover structure at other points on the inner surface of said lamp cover structure.
1 more element
An LED device, comprising:
- a lamp cover structure including a first lens cap providing the outer surface of said lamp cover structure and a cavity at the inner surface, a second lens cap providing the inner surface of said lamp cover structure, and a wavelength-conversion layer sandwiched between the said first lens cap and the said second lens cap;
- at least one LED package covered by said lamp cover structure and providing excitation light for said lamp cover structure;
- and
- a substrate on which the at least one LED package is bonded and said lamp cover structure is attached,
- wherein the inner surface of said lamp cover structure has different curvatures or different normal vector planes thereon such that light emitted from a point on the inner surface of said lamp cover structure is recaptured by said lamp cover structure at other points on the inner surface of said lamp cover structure,
- wherein the lamp cover has an outer surface area of at least 300 mm2 per watt of the excitation light in order to provide faster heat transfer out of the lamp cover, and
- wherein the gap between the LED package and the lamp cover is at least 3 mm in order to reduce light entering the LED package from the lamp cover, thereby reducing absorption loss of light by the LED package.
4 more elements
Dependencies are inferred from the claim text.