ASPHERICAL LED LENS AND LIGHT EMITTING DEVICE INCLUDING THE SAME

• US 20140071696A1
• Filed: 11/15/2013
• Published: 03/13/2014
• Est. Priority Date: 01/07/2010
• Status: Active Grant

• Current Assignee: Seoul Semiconductor Co., Ltd.
• Original Assignee: Seoul Semiconductor Co., Ltd.
• Inventors: LEE, Sang Cheol, HWANG, Woong Jun, OH, Hee Tak, PARK, Kwang II, HAN, Jeong A
• Granted Patent: US 9,022,618 B2
• Time in Patent Office: Days
• US Class Current: 362/311.02
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21V 5/046 the lens having a rotationally symmetrical shape about an axis for transmitting light in a direction mainly perpendicular to this axis, e.g. ring or annular lens with light source disposed inside the ring
• CPC Class Codes: F21W 2131/103 of streets or roads
• CPC Class Codes: F21Y 2101/00 Point-like light sources
• 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 19/0061 the light source comprising a LED semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission H01L33/00
• CPC Class Codes: G02B 19/0095 for use with ultraviolet radiation
• CPC Class Codes: G02B 27/0955 Lenses lenses per se G02B3/00
• CPC Class Codes: G02B 3/04 with continuous faces that are rotationally symmetrical but deviate from a true sphere , e.g. so called "aspheric" lenses
• CPC Class Codes: H01L 2224/48091 Arched
• 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 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/58 Optical field-shaping elements

Abstract

Exemplary embodiments of the present invention relate to an aspherical light emitting diode (LED) lens and a light emitting device including the same. The aspherical LED lens includes a light exit plane concavely depressed near a central axis, a light entrance plane including a conical plane having a vertex located on the central axis, and a plurality of protrusions arranged on a portion of a side surface of the light exit plane. The aspherical LED lens has a radially symmetrical structure with respect to the central axis.

Claims

1. An aspherical lens, comprising:

a light entrance plane configured to receive light emitted from a light source; and

a light exit plane configured to radiate the light received by the light entrance plane,

wherein the light exit plane comprises;

protrusions disposed on a portion of a side surface of the light exit plane; and

a curved surface disposed on the side surface of the light exit plane,

wherein the aspherical lens has a symmetrical structure.

2. The aspherical lens of claim 1, wherein the light entrance plane comprises conical section centered on the central axis of the aspherical lens.

3. The aspherical lens of claim 1, wherein the curved surface comprises radii of curvature ranging from 1.0 to 5.0.

4. The aspherical lens of claim 1, wherein the aspherical lens comprises a dispersing part.

15. The aspherical lens of claim 1, wherein the aspherical lens comprises a linear section disposed between the curved surface and a central axis of the aspherical lens.

5. A light emitting device, comprising:

a substrate;

a light emitting diode (LED) chip disposed on the substrate; and

an aspherical LED lens disposed on the LED chip, the aspherical LED lens comprising a radially symmetrical structure with respect to a central axis of the aspherical LED lens,

wherein the aspherical LED lens comprises;

protrusions disposed on a portion of a side surface of the light exit plane;

a curved surface disposed on the side surface of the light exit plane; and

a linear section disposed between the curved surface and a central axis of the aspherical LED lens.

6. The light emitting device of claim 5, wherein the LED chip is surrounded by fluorescent material.

7. The light emitting device of claim 5, wherein the light emitting device comprises an encapsulation material surrounding the LED chip.

8. The light emitting device of claim 5, wherein the light entrance plane comprises conical section centered on the central axis of the aspherical lens.

9. The light emitting device of claim 5, wherein the light emitting device comprises an air layer between the light entrance plane and the LED chip.

10. The aspherical lens of claim 5, wherein the curved surface comprises radii of curvature ranging from 1.0 to 5.0.

11. The light emitting device of claim 5, wherein the aspherical LED lens comprises a dispersing part.

12. The light emitting device of claim 5, wherein the LED chip is disposed on the central axis of the aspherical LED lens.

13. The light emitting device of claim 5, wherein the substrate comprises a cavity in which the LED chip is disposed.

14. A light emitting device, comprising;

a substrate;

a light emitting diode (LED) chip disposed on the substrate,

fluorescent material disposed on the LED chip;

an aspherical LED lens disposed on the LED chip, the aspherical LED lens comprising;

different cross-sections respectively taken along a major axis and a minor axis of the aspherical LED lens; and

protrusions disposed on a side surface of the aspherical LED lens.