Light emitting apparatus

• US 8,395,183 B2
• Filed: 11/19/2010
• Issued: 03/12/2013
• Est. Priority Date: 11/20/2009
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Lee, Sang Won, Bak, Gyu Hyeong
• Primary Examiner(s): Parker, Kenneth
• Assistant Examiner(s): Page, Dale E
• Application Number:
  US12/949,915
• Publication Number:
  US 20110121341A1
• Time in Patent Office: 844 Days
• Field of Search: 257/89, 257/99, 257/102, 257/E21.47
• 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;

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 downwardly concave first recess formed at a center of a top surface of the lens body and an upwardly concave second recess formed at a center of a bottom surface of the lens body, and at least one of lens supporters 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, and

wherein a thickness of the lens body between a bottom surface of the downwardly concave first recess and a top surface of the upwardly concave second recess increases from a center region of one of the downwardly concave first recess or the upwardly concave second recess to an end region thereof,

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.

2. The light emitting apparatus of claim 1, wherein a ratio of a maximum depth of the first recess to a maximum thickness of the lens body is about 0.06 to 0.1, and a ratio of a maximum depth of the second recess to the maximum thickness of the lens body is about 0.5 to 0.75.

3. The light emitting apparatus of claim 1, wherein a ratio of a maximum width of the first recess to a maximum width of the lens body is about 0.18 to 0.3, and a ratio of a maximum width of the second recess to the maximum width of the lens body is about 0.14 to 0.25.

4. The light emitting apparatus of claim 1, wherein a ratio of a maximum width of the first recess to a maximum width of the second recess is about 0.7 to 0.94.

5. The light emitting apparatus of claim 1, wherein at least a part of the encapsulant resin layer is disposed in the second recess.

6. The light emitting apparatus of claim 1, wherein the lens supporters are spaced apart from each other.

7. The light emitting apparatus of claim 6, wherein the lens supporters have three lens supporters.

8. The light emitting apparatus of claim 1, wherein a peripheral portion of the top surface of the lens body is flat.

9. The light emitting apparatus of claim 1, wherein the lens supporter is bonded to the substrate.

10. The light emitting apparatus of claim 1, wherein an entire top surface of the encapsulant resin layer is provided within the upwardly concave second recess.

11. The light emitting apparatus of claim 1, wherein the lens body has a thickness between the top surface and the bottom surface that becomes thicker from a central portion toward an edge portion and then becomes thinner.

19. The light emitting apparatus of claim 1, wherein the downwardly concave first recess overlaps with the upwardly concave second recess in a vertical direction,

the upwardly concave second recess having a first point at a center thereof, a second point at a first end of the upwardly concave second recess, a third point in between the first point and the second point, and a fourth point at a second end of the upwardly concave second recess,

wherein the downwardly concave first recess having a fifth point at a center thereof, a sixth point vertically aligned with the second point, and a seventh point in between the fifth point and the sixth point and being vertically aligned with the third point;

wherein the entire fluorescent layer and the entire encapsulant resin layer are provided under the upwardly concave second recess that extends from the second point to the fourth point,

wherein a first distance is the distance between the first point and the fifth point, a second distance is the distance between the third point and the seventh point, and a third distance is the distance between the second point and the sixth point, and wherein the second distance is greater than the first distance and the third distance is greater than the second distance.

12. A light emitting apparatus comprising:

a substrate;

a light emitting device on the substrate;

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

an encapsulant resin layer on the fluorescent layer to surround the fluorescent layer; and

a lens on the light emitting device and supported by the substrate,

wherein the lens includes a lens body having a first recess and a second recess and at least one lens supporter, the first recess formed at a center of a top surface of the lens body and that extends toward a central portion of the lens body, and the second recess formed at a center of a bottom surface of the lens body and that extends toward the central portion of the lens body, and wherein the first recess vertically overlaps the second recess, and the at least one lens supporter is provided at the bottom surface of the lens body to support the lens body such that the lens body is spaced from the substrate, and

wherein a thickness of the lens body between a bottom surface of the first recess and a top surface of the second recess increases from a center region of one of the first recess or the second recess to an end region thereof,

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.

13. The light emitting apparatus of claim 12, wherein a ratio of a maximum depth of the first recess to a maximum thickness of the lens body is about 0.06 to 0.1, and a ratio of a maximum depth of the second recess to the maximum thickness of the lens body is about 0.5 to 0.75.

14. The light emitting apparatus of claim 12, wherein a ratio of a maximum width of the first recess to a maximum width of the lens body is about 0.18 to 0.3, and a ratio of a maximum width of the second recess to the maximum width of the lens body is about 0.14 to 0.25.

15. The light emitting apparatus of claim 12, wherein a ratio of a maximum width of the first recess to a maximum width of the second recess is about 0.7 to 0.94.

16. The light emitting apparatus of claim 12, wherein an entire top surface of the encapsulant resin layer is provided within the second recess.

17. The light emitting apparatus of claim 12, wherein the lens body has a thickness between the top surface and the bottom surface that becomes thicker from a central portion toward an edge portion and then becomes thinner.

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

the second recess having a first point at a center thereof, a second point at a first end of the second recess, a third point in between the first point and the second point, and a fourth point at a second end of the second recess,

wherein the first recess having a fifth point at a center thereof, a sixth point vertically aligned with the second point, and a seventh point in between the fifth point and the sixth point and being vertically aligned with the third point;

wherein the entire fluorescent layer and the entire encapsulant resin layer are provided under the second recess that extends from the second point to the fourth point,

wherein a first distance is the distance between the first point and the fifth point, a second distance is the distance between the third point and the seventh point, and a third distance is the distance between the second point and the sixth point, and wherein the second distance is greater than the first distance and the third distance is greater than the second distance.