Lens, Light Emitting Apparatus Including the Lens, and Backlight Unit Including the Apparatus

Patent metadata

Field	Value
Publication number	US-2016123554-A1
Application number	US-201514928273-A
Country	US
Kind code	A1
Filing date	Oct 30, 2015
Priority date	Nov 3, 2014
Publication date	May 5, 2016
Grant date	—

Abstract

A light emitting apparatus is disclosed. The light emitting apparatus includes a light source and a lens located on the light source, wherein the lens includes an upper surface, a lower surface located under the upper surface such that the lower surface is opposite to the light source, and a lateral surface connected between the upper surface and the lower surface, and wherein the lateral surface includes a plurality of segments inclined at different angles, at least one of the segments having a pattern, the pattern having root mean square (RMS) roughness including holes and rods.

First claim

What is claimed is:

1 . A light emitting apparatus, comprising:
a light source; and a lens located on the light source, wherein the lens comprises: an upper surface; a lower surface located under the upper surface such that the lower surface is opposite to the light source; and a lateral surface connected between the upper surface and the lower surface, and wherein the lateral surface comprises a plurality of segments inclined at different angles, at least one of the segments having a pattern, the pattern having root mean square (RMS) roughness comprising holes and rods.

2 . The light emitting apparatus according to claim 1 , wherein a lower segment connected to the lower surface among the segments has an RMS roughness greater than 0 μm and less than 60 μm.

3 . The light emitting apparatus according to claim 1 , wherein the holes and the rods are periodically arranged.

4 . The light emitting apparatus according to claim 1 , wherein the holes and the rods are non-periodically arranged.

5 . The light emitting apparatus according to claim 1 , wherein the upper surface has a recess that is recessed toward the light source.

6 . The light emitting apparatus according to claim 1 , wherein each of the segments has a width gradually increasing from the lower surface to the upper surface.

7 . The light emitting apparatus according to claim 1 , wherein one segment close to the lower surface among the segments has a smaller width than another segment close to the upper surface among the segments.

8 . The light emitting apparatus according to claim 1 , wherein one segment close to the lower surface among the segments has a smaller angle of inclination than another segment close to the upper surface among the segments.

9 . The light emitting apparatus according to claim 1 , wherein one segment close to the lower surface among the segments has a larger angle of inclination than another segment close to the upper surface among the segments.

10 . The light emitting apparatus according to claim 1 , wherein one segment close to the lower surface among the segments has larger RMS roughness than another segment close to the upper surface among the segments.

11 . The light emitting apparatus according to claim 1 , wherein the lower surface of the lens has an incident surface for allowing light emitted from the light source to be incident thereupon, the upper surface of the lens has a reflective surface for reflecting the light incident upon the incident surface, and one segment close to the lower surface among the lateral surfaces of the lens has a scattering surface for scattering the light reflected by the reflective surface.

12 . The light emitting apparatus according to claim 1 , wherein the lens is symmetric with respect to a light axis.

13 . The light emitting apparatus according to claim 1 , wherein the lens is asymmetric with respect to a light axis.

14 . The light emitting apparatus according to claim 1 , wherein the segments comprise:
a lower segment extending from the lower surface toward the upper surface in a state of being inclined; and an upper segment extending from the lower segment toward the upper surface in a state of being inclined.

15 . The light emitting apparatus according to claim 14 , wherein at least one of the lower or upper segments is straight.

16 . The light emitting apparatus according to claim 14 , wherein at least one of the lower or upper segments is curved.

17 . The light emitting apparatus according to claim 1 , further comprising a cover located on the lens.

18 . The light emitting apparatus according to claim 17 , wherein the cover comprises at least one selected from among:
a transmission plate transmitting at least some of light exiting from the lens; a reflection plate reflecting at least some of light exiting from the lens; and a diffusion plate diffusing at least some of light exiting from the lens.

19 . A backlight unit, comprising:
a bottom chassis; a reflection member located on the bottom chassis; at least one light emitting apparatus according to claim 1 , the light emitting apparatus being located on the reflection member; and an optical sheet located on the light emitting apparatus in a state of being supported by the bottom chassis.

20 . A lens, comprising:
an upper surface; a lower surface located under the upper surface such that the lower surface is opposite to a light source; and a lateral surface connected between the upper surface and the lower surface, wherein the lateral surface comprises a plurality of segments inclined at different angles, at least one of the segments having a pattern, the pattern having RMS roughness.

Assignees

• Lg Innotek Co Ltd

Inventors

• Kang Lee Im

Classifications

• F21V13/02

  Combinations of only two kinds of elements · CPC title

• F21V5/045 Primary

  the lens having discontinuous faces, e.g. Fresnel lenses · CPC title

• F21V5/04

  of lens shape · CPC title

• G02B3/08 Primary

  with discontinuous faces, e.g. Fresnel lens {(diffractive Fresnel lenses G02B5/1876)} · CPC title

• G02F1/133607

  the light controlling member including light directing or refracting elements, e.g. prisms or lenses · CPC title