LIGHT EMITTING APPARATUS

• US 20140332837A1
• Filed: 07/23/2014
• Published: 11/13/2014
• 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
• Granted Patent: US 9,885,450 B2
• Time in Patent Office: Days
• US Class Current: 257/98
• 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, and

wherein the first portion of the first recess has a rounded shape.

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.

9. The light emitting apparatus of claim 7, wherein the encapsulant has a convex top surface corresponding to a concave portion of the second recess.

10. The light emitting apparatus of claim 1, wherein the lens further includes a supporter protruding from a peripheral portion of the bottom surface of the lens body and attached to the substrate.

11. 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 side portion having an outer side surface and a peripheral portion between the center portion and the side portion,

wherein the center portion of the lens has a thickness thinner than a thickness of the peripheral portion,

wherein the center portion has a first recess and a second recess opposite to each other, first recess disposed on a top surface of the center portion and the second recess disposed on a bottom surface of the center portion,

wherein a lowest surface of the first recess has a position lower than a position of a top surface of the peripheral portion and a highest surface of the second recess has a position higher than a position of a bottom surface of the peripheral portion, and

wherein the thickness of the peripheral portion increases as it goes from the side portion to the center portion, the bottom surface of the peripheral portion has a flat surface parallel to a top surface of the substrate.

12. The light emitting apparatus of claim 11, wherein the side portion has a top surface and a bottom surface opposite to each other, the top and bottom surfaces parallel to the substrate.

13. The light emitting apparatus of claim 11, wherein a depth of the second recess is greater than a depth of the first recess.

14. The light emitting apparatus of claim 11, further comprising:

an encapsulant surrounding the light emitting device.

15. The light emitting apparatus of claim 14, wherein a width of the second recess is greater than a width of the encapsulant.

16. The light emitting apparatus of claim 14, wherein the encapsulant has a convex top surface corresponding to a concave portion of the second recess.

17. The light emitting apparatus of claim 11, wherein a point contacting a top surface of the center portion with a top surface of the peripheral portion has an inflection point.

18. The light emitting apparatus of claim 11, further comprising:

a supporter protruding from the bottom surface of the peripheral portion and attached to the substrate.

19. The light emitting apparatus of claim 11, 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,

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