Light emitting apparatus

• US 9,885,450 B2
• Filed: 07/23/2014
• Issued: 02/06/2018
• 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): Valentine, Jami M
• Application Number:
  US14/338,812
• Publication Number:
  US 20140332837A1
• Time in Patent Office: 1,294 Days
• Field of Search: 257 98, 257102
• 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 and supported by the substrate,

wherein the lens includes a lens body, the lens body having a first recess at a center of a top surface of the lens body and a second recess at a center of a bottom surface of the lens body, and the first and second recesses opposite to each other,

wherein the first recess comprise a first portion at a lowest position, a second portion at a highest position, and a third portion between the lowest position and the highest position,

wherein the lens includes a supporter protruding from a portion of the bottom surface of the lens body,

wherein the portion of the bottom surface is not vertically overlapped with the first recess and is separated from the second recess,

wherein, the supporter is disposed on the substrate,

wherein a material of the supporter is same as a material of the lens body,

wherein the supporter is disposed closer to an outer side surface of the lens body than a side surface of the second recess,

wherein the supporter is not vertically overlapped with the second recess,

wherein a width of the first recess is greater than a width of the second recess,

wherein a top surface of the light emitting device is disposed lower than the portion of the bottom surface of the lens body, and

wherein the supporter protrudes from the portion of the bottom surface of the lens body to the substrate providing a gap between the portion of the bottom surface of the lens body and a top surface of the substrate and between the light emitting device and the second recess.

2. The light emitting apparatus of claim 1, wherein the second recess comprise a first portion at a highest position, a second portion at a lowest position and a third portion between the highest position and the lowest position, and wherein the second portion of the second recess has a inclined-rounding shape.

3. 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.

4. 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.

5. 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.

6. 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.

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

a package body on the substrate, the light emitting device disposed on the package body.

8. The light emitting apparatus of claim 7, further comprising:

an encapsulant surrounding the light emitting device and disposed under the second recess,

wherein a top surface of the supporter is disposed lower than a top surface of the encapsulant.

9. The light emitting apparatus of claim 8, wherein the encapsulant has a convex top surface corresponding to a concave portion of the second recess.

12. The light emitting apparatus of claim 8, wherein the encapsulant surrounding the light emitting device is spaced apart from the second recess of the lens.

10. 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 lens body including a center portion, a side portion having an outer side surface, and a peripheral portion between the center portion and the side portion,

wherein the lens includes a first rounded surface at the center portion and a second rounded surface at the peripheral portion,

wherein the lens includes a first recess and a second recess at a center portion of the lens,

wherein the lens includes a supporter protruding from a peripheral bottom portion of the lens body,

wherein the peripheral bottom portion is not vertically overlapped with the first recess and is separated from the second recess,

wherein the supporter is disposed on the substrate,

wherein the peripheral bottom portion of the lens body is spaced apart from the substrate,

wherein a distance between the supporter and the outer side surface of the lens is smaller than a distance between the supporter and a side surface of the second recess,

wherein a width of the first recess is greater than a width of the second recess,

wherein a top surface of the light emitting device is disposed lower than the peripheral bottom portion of the lens body, and

wherein the supporter protrudes from the peripheral bottom portion of the lens body to the substrate providing a gap between the peripheral bottom portion of the lens body and a top surface of the substrate and between the light emitting device and the second recess.

11. The light emitting apparatus of claim 10, wherein a material of the supporter is same as a material of the lens body.