Light emitting apparatus

• US 9,638,378 B2
• Filed: 09/16/2015
• Issued: 05/02/2017
• 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): Jackson, Jr., Jerome
• Application Number:
  US14/855,658
• Publication Number:
  US 20160003421A1
• Time in Patent Office: 594 Days
• Field of Search: 257 4
• 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 lens comprising:

a lens body having a convex top surface and a bottom surface, the convex top surface including a first recessed part at a central portion thereof and a flat top surface at a circumference of the top surface of the lens body, the bottom surface including a second recessed part at a central portion thereof, wherein the flat top surface is disposed lower than a lowest point of the first recessed part, and the flat top surface is disposed lower than a highest point of the second recessed part; and

a plurality of lens supporters at the bottom surface of the lens body,

wherein a maximum width at a portion in which the convex top surface of the lens body is curved ranges from about 12 mm to about 18 mm,

wherein a maximum width of the lens body ranges from about 13 mm to about 19 mm,

wherein a ratio of a maximum width of the second recessed part to the maximum width at the portion in which the convex top surface of the lens body is curved ranges from about 0.15 to about 0.27, and

wherein a ratio of the maximum width of the second recessed part to the maximum width of the lens body ranges from about 0.14 to about 0.25.

2. The lens according to claim 1, wherein a ratio of a maximum depth of the second recessed part to the maximum width at the portion in which the convex top surface of the lens body is curved ranges from about 0.14 to about 0.25.

3. The lens according to claim 1, wherein a ratio of a maximum depth of the second recessed part to the maximum width of the lens body ranges from about 0.13 to about 0.23.

4. The lens according to claim 3, wherein a ratio of a maximum depth of the second recessed part to a maximum thickness of the lens body ranges from about 0.5 to about 0.75.

5. The lens according to claim 1, wherein a maximum depth of the second recessed part is a distance from a top surface of the second recessed part to the bottom surface of the lens body, and

wherein the maximum depth of the second recessed part ranges from about 2.5 mm to about 3 mm.

6. The lens according to claim 1, wherein a maximum thickness of the lens body is a distance from a top surface of the lens body to the bottom surface of the lens body, and

wherein the maximum thickness of the lens body ranges from about 4 mm to about 5 mm.

7. The lens according to claim 1, wherein the maximum width of the second recessed part is the longest distance between two points at a bottom surface of the second recessed part, and

wherein the maximum width of the second recessed part ranges from about 2.8 mm to about 3.3 mm.

8. The lens according to claim 1, wherein a ratio of a maximum width of the first recessed part to the maximum width of the lens body ranges from about 0.18 to about 0.3.

9. The lens according to claim 1, wherein a ratio of a maximum depth of the first recessed part to a maximum thickness of the lens body ranges from about 0.06 to about 0.1.

10. The lens according to claim 9, wherein the maximum depth of the first recessed part is a distance from the top surface of the lens body to a bottom surface of the first recessed part, and

wherein the maximum depth of the first recessed part ranges from about 0.3 mm to about 0.4 mm.

11. The lens according to claim 1, wherein a ratio of the maximum depth of the second recessed part to a maximum depth of the first recessed part ranges from about 6.25 to about 10.

12. The lens according to claim 1, wherein a ratio of the maximum width of the second recessed part to a maximum width of the first recessed part ranges from about 0.7 to about 0.94.

13. The lens according to claim 1, wherein the first recessed part and the second recessed part vertically overlap each other, and

wherein the first recessed part is formed of downwardly concave shape and the second recessed part is formed of upwardly concave shape.

14. The lens according to claim 1, wherein the plurality of lens supports comprises at least three or more lens supporters.

15. A light emitting apparatus comprising:

a substrate;

a light emitting device on the substrate; and

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

wherein the lens comprises a lens body and a plurality of lens supporters at a bottom surface of the lens body,

wherein the lens body includes a convex top surface and the bottom surface, the convex top surface including a first recessed part at a central portion thereof and a flat top surface at a circumference of the top surface of the lens body, the bottom surface including a second recessed part at a central portion thereof, wherein the flat top surface is disposed lower than a lowest point of the first recessed part, and the flat top surface is disposed lower than a highest point of the second recessed part,

wherein a maximum width at a portion in which the convex top surface of the lens body is curved ranges from about 12 mm to about 18 mm,

wherein a maximum width of the lens body ranges from about 13 mm to about 19 mm,

wherein a ratio of a maximum width of the second recessed part to the maximum width at the portion in which the convex top surface of the lens body is curved ranges from about 0.15 to about 0.27, and

wherein a ratio of the maximum width of the second recessed part to the maximum width of the lens body ranges from about 0.14 to about 0.25.

16. The light emitting apparatus according to claim 15, wherein a ratio of a maximum depth of the second recessed part to the maximum width at the portion in which the convex top surface of the lens body is curved ranges from about 0.14 to about 0.25.

17. The light emitting apparatus according to claim 15, wherein a ratio of a maximum depth of the second recessed part to the maximum width of the lens body ranges from about 0.13 to about 0.23.

18. The light emitting apparatus according claim 15, further comprising a fluorescent layer provided on the substrate and the light emitting device to surround the light emitting device, and

an encapsulant resin layer provided on the substrate and the fluorescent layer to surround the fluorescent layer.

19. The light emitting apparatus according to claim 15, wherein the light emitting device is provided under the second recessed part.

20. A light unit comprising:

a printed circuit board;

a light emitting device directly mounted on the printed circuit board; and

a lens disposed on the light emitting device and supported by the printed circuit board,

wherein the lens comprises a lens body and a plurality of lens supporters at a bottom surface of the lens body,

wherein the lens body includes a convex top surface and the bottom surface, the convex top surface including a first recessed part at a central portion thereof and a flat top surface at a circumference of the top surface of the lens body, the bottom surface including a second recessed part at a central portion thereof, wherein the flat top surface is disposed lower than a lowest point of the first recessed part, and the flat top surface is disposed lower than a highest point of the second recessed part,

wherein a maximum width at a portion in which the convex top surface of the lens body is curved ranges from about 12 mm to about 18 mm,

wherein a maximum width of the lens body ranges from about 13 mm to about 19 mm,

wherein a ratio of a maximum width of the second recessed part to the maximum width at the portion in which the convex top surface of the lens body is curved ranges from about 0.15 to about 0.27, and

wherein a ratio of the maximum width of the second recessed part to the maximum width of the lens body ranges from about 0.14 to about 0.25.