Light emitting apparatus

• US 8,823,048 B2
• Filed: 02/05/2013
• Issued: 09/02/2014
• Est. Priority Date: 11/20/2009
• Status: Active Grant

• Current Assignee: Light Guide Innovations LLC (Anjay Venture Partners LLC)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Lee, Sang Won, Bak, Gyu Hyeong
• Primary Examiner(s): Page, Dale E
• Application Number:
  US13/759,564
• Publication Number:
  US 20130146923A1
• Time in Patent Office: 574 Days
• Field of Search: 257/102, 257/79, 257/196, 257/E21.466
• US Class Current: 257/102
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 19/0014 at least one surface having optical power
• CPC Class Codes: G02B 19/0066 in the form of an LED array
• CPC Class Codes: G02B 19/0071 adapted to illuminate a complete hemisphere or a plane extending 360 degrees around the source
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/32 containing nitrogen
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: H01L 33/52 Encapsulations
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin
• CPC Class Codes: H01L 33/58 Optical field-shaping elements

Abstract

Provided is a light emitting apparatus. The light emitting apparatus includes a substrate; a light emitting device on the substrate; a fluorescent layer formed on the substrate and the light emitting device to surround the light emitting device; an encapsulant resin layer formed on the substrate and the fluorescent layer to surround the fluorescent layer; and a lens disposed on the light emitting device and supported by the substrate, wherein the lens includes a lens body having a first recess formed at a center of a top surface of the lens body and a second recess formed at a center of a bottom surface of the lens body, and a lens supporter provided at the bottom surface of the lens body to support the lens body such that the lens body is spaced apart from the substrate.

Claims

1. A light emitting apparatus comprising:

a substrate;

a light emitting device on the substrate; and

a lens on the light emitting device,

wherein the lens includes a center portion, a peripheral portion surrounding the center portion and a side portion surrounding the peripheral portion and having an outer side surface,

wherein the center portion of the lens has a first top surface with a first recess and a first bottom surface with a second recess, the first and second recesses opposite to each other,

wherein the first recess has an inwardly-concave curvature shape,

wherein the first recess has a width greater than that of the second recess,

wherein a thickness of the outer side surface of the side portion is smaller than a depth of the second recess of the center portion, and

wherein the peripheral portion of the lens has a second rounded-top surface extending from the first top surface to the side portion, and

wherein the second rounded-top surface of the peripheral portion has a continuing surface between the center portion and the side portion.

2. The light emitting apparatus of claim 1, wherein the second recess has an inwardly-concave curvature shape.

3. The light emitting apparatus of claim 1, wherein the peripheral portion has a second bottom surface parallel to a top surface of the substrate.

4. The light emitting apparatus of claim 1, wherein the outer side surface is substantially perpendicular to the top surface of the substrate.

5. The light emitting apparatus of claim 1, wherein a highest point of the outer side surface is positioned between a lowest point and a highest point of the depth of the second recess.

6. The light emitting apparatus of claim 3, wherein a second bottom surface of the peripheral portion is spaced apart from the top surface of the substrate.

7. The light emitting apparatus of claim 1, wherein the lens further includes a lens supporter under the peripheral portion.

8. The light emitting apparatus of claim 7, wherein the lens supporter downwardly protrudes from a second bottom surface of the peripheral portion.

9. The light emitting apparatus of claim 7, wherein the lens supporter directly contacts the top surface of the substrate.

10. The light emitting apparatus of claim 1, wherein a first top surface of the center portion and a second top surface of the peripheral portion contacting with each other has a point of inflection.

11. The light emitting apparatus of claim 1, wherein a ratio of a maximum depth of the first recess to a maximum depth of the second recess is about 6.25 to 10.

12. The light emitting apparatus of claim 1, further comprising:

a fluorescent layer on the light emitting device to surround the light emitting device; and

a resin layer on the fluorescent layer.

13. The light emitting apparatus of claim 12, wherein the resin layer contacts the fluorescent layer and is spaced apart from a surface of the second recess.

19. The light emitting apparatus of claim 3, wherein the second top surface of the peripheral portion has a continuing surface between the first bottom surface and the lens supporter, and the second top surface includes a minimum surface and a maximum surface having different distances from the second bottom surface of the peripheral portion.

14. A light emitting apparatus comprising:

a substrate;

a light emitting device on the substrate; and

a lens on the light emitting device,

wherein the lens includes a center portion, a peripheral portion surrounding the center portion and a side portion surrounding the peripheral portion,

wherein the center portion of the lens has a first top surface with a first recess and a first bottom surface with a second recess, the first and second recesses opposite to each other,

wherein the peripheral portion has a second top surface with a rounded shape and a second bottom surface parallel to a top surface of the substrate,

wherein the first recess has an inwardly-concave curvature shape,

wherein the first recess has a width greater than that of the second recess,

wherein the side portion of the lens has a third top surface, a third bottom surface and an outer side surface, the third bottom surface being opposite and parallel to the third top surface, the outer side surface having a first portion contacting a portion of the third top surface and a second portion contacting a portion of the third bottom surface, and

wherein the third top surface of the side portion of the lens is in a position lower than a highest point of a depth of the second recess,

the light emitting apparatus further comprising;

a lens supporter protruding from an interface region between the second bottom surface and the third bottom surface toward the substrate.

15. The light emitting apparatus of claim 14, wherein a highest point of the third top surface is positioned between a lowest point and the highest point of the second recess.

16. The light emitting apparatus of claim 14, wherein the second bottom surface of the peripheral portion is spaced apart from the top surface of the substrate.

17. The light emitting apparatus of claim 14, wherein the first top surface of the center portion and the second top surface of the peripheral portion contacting with each other has a point of inflection.

18. The light emitting apparatus of claim 14, wherein a ratio of a maximum depth of the first recess to a maximum depth of the second recess is about 6.25 to 10.