Optical lens, light emitting module and light unit having the same

Patent metadata

Field	Value
Publication number	US-2016201875-A1
Application number	US-201614991375-A
Country	US
Kind code	A1
Filing date	Jan 8, 2016
Priority date	Jan 8, 2015
Publication date	Jul 14, 2016
Grant date	—

Abstract

An optical lens and a light emitting module having the optical lens is provided. The optical lens may include a bottom surface, a recess upwardly convex at a central region of the bottom surface, a light input surface at a circumference of the recess, a first light output surface having a convexly curved surface at opposite sides of the bottom surface and the light input surface, and a second light output surface at a lower circumference of the first light output surface, wherein the bottom surface includes a first edge adjacent to the recess and a second edge adjacent to the second light output surface, a region of the bottom surface more adjacent to the first edge gradually approaches a first axis that is horizontal to a center of a bottom of the recess, and the first light output surface has a convex central region.

First claim

What is claimed is:

1 . An optical lens comprising:
a bottom surface; a recess that is upwardly convex at a central region of the bottom surface; a light input surface at a circumference of the recess; a first light output surface having a convexly curved surface at opposite sides of the bottom surface and the light input surface; and a second light output surface having a flat surface at a circumference of the first light output surface, wherein: the bottom surface includes a first edge adjacent to the recess and a second edge adjacent to the second light output surface; a region of the bottom surface more adjacent to the first edge gradually approaches a first axis horizontal to a center of a bottom of the recess; a lower region of the light input surface provided lower than a straight horizontal line passing through the second edge; and the first light output surface includes a curved surface that vertically overlaps the recess and a convex central region.

2 . The optical lens according to claim 1 , wherein a straight line that connects the first edge and the second edge of the bottom surface is inclined at an angle of 5° or smaller with respect to the first axis.

3 . The optical lens according to claim 1 , wherein the bottom surface is provided above a straight line connecting the first edge and the second edge, and includes a curved surface having a negative curvature.

4 . The optical lens according to claim 1 , wherein the bottom surface includes an inclined surface.

5 . The optical lens according to claim 1 , wherein an interval between the second edge of the bottom surface and the first axis is smaller than a width of the second light output surface.

6 . The optical lens according to claim 1 , wherein a depth of the recess is 80% or more of a thickness of the optical lens.

7 . The optical lens according to claim 1 , wherein:
a first vertex of the light input surface and a second vertex of the first light output surface are provided at a central axis perpendicular to a center of the bottom of the recess; and an interval between the second edge of the bottom surface and the first axis is smaller than a distance between the first vertex of the light input surface and the second vertex of the first light output surface.

8 . The optical lens according to claim 1 , wherein:
a diameter of the recess gradually decreases toward a first vertex of the light input surface; and a depth of the recess is greater than a width of the bottom of the recess.

9 . The optical lens according to claim 7 , wherein:
a center region of the first light output surface has an angle of 20° or smaller from the central axis with respect to the center of the bottom of the recess; and the second light output surface has an angle of 20° or smaller from the first axis with respect to the center of the bottom of the recess.

10 . An optical lens comprising:
a bottom surface; a recess that is upwardly convex at a central region of the bottom surface; a light input surface at a circumference of the recess; a first light output surface having a convexly curved surface at opposite sides of the bottom surface and the light input surface; and a second light output surface having a flat surface at a circumference of the first light output surface, wherein: the bottom surface includes a first edge adjacent to the recess and a second edge adjacent to the second light output surface; a region of the bottom surface more adjacent to the first edge gradually approaches a first axis horizontal to a center of a bottom of the recess; a lower region of the light input surface provided lower than a straight horizontal line passing through the second edge; the first light output surface includes a curved surface that vertically overlaps the recess and a convex central region; the second light output surface includes a third edge adjacent to the first light output surface; a first vertex of the light input surface is closer to a second vertex of the first light output surface than a straight horizontal line passing through the third edge of the second light output surface; a diameter of the recess gradually decreases toward the first vertex of the light input surface; and a depth of the recess is greater than a width of the bottom of the recess.

11 . The optical lens according to claim 10 , wherein:
a straight line connecting the first edge and the second edge of the bottom surface is inclined at an angle of 5° or smaller with respect to the first axis; and the bottom surface includes at least one of a curved surface having a negative curvature and an inclined surface.

12 . The optical lens according to claim 10 , wherein:
the depth of the recess is 80% or more of a thickness of the optical lens; the first vertex of the light input surface and a second vertex of the first light output surface are provided at a central axis perpendicular to a center of the bottom of the recess; and an interval between the second edge of the bottom surface and the first axis is smaller than a distance between the first vertex of the light input surface and the second vertex of the first light output surface.

13 . The optical lens according to claim 12 , wherein:
the bottom surface includes a plurality of supporting protrusions; and the plurality of supporting protrusions are provided in the same intervals from the center of the bottom of the recess.

14 . The optical lens according to claim 12 , wherein:
the interval between the second edge of the bottom surface and the first axis is smaller than an interval between the third edge of the second light output surface and the second edge; and a portion of the second light output surface includes a side protruding portion that protrudes outward.

15 . A light emitting module comprising:
a light emitting device configured to emit light through an upper surface and a plurality of side surfaces; an optical lens provided on the light emitting device; and a circuit board provided below the optical lens and the light emitting device, wherein: the optical lens includes a bottom surface, a recess that is upwardly convex at a central region of the bottom surface having the light emitting device provided therein, a light input surface formed at a circumference of the recess, a first light output surface having a convexly curved surface formed at opposite sides of the bottom surface and the light input surface, and a second light output surface having a flat surface at a portion of the first light output surface; the bottom surface of the optical lens includes a first edge adjacent to the recess and a second edge adjacent to the second light output surface; a region of the bottom surface of the optical lens more adjacent to the first edge gradually approaches a first axis horizontal to a center of a bottom of the recess; a lower region of the light input surface protrudes downward past a straight horizontal line passing through the second edge and corresponds to a side surface of the light emitting device; the first light output surface includes a curved surface that vertically overlaps the recess and a convex central region; and out of light emitted from the light emitting device, an output angle of first light emitted through the second light output surface is smaller than an incidence angle of the first light incident on the light input surface.

16 . The light emitting module according to claim 15 , wherein an angle formed by two straight lines passing through a third edge of the optical lens is greater than a beam spread angle

Assignees

• Lg Innotek Co Ltd

Inventors

• Kang Min Soo
• Kim Kwang Ho
• Shin Yun Ho
• Kim Sun Woong
• Jung Ui Youn

Classifications

• F21V5/04 Primary

  of lens shape · CPC title

• G02B19/0061

  the light source comprising a LED · CPC title

• G02F1/133606

  including a specially adapted diffusing, scattering or light controlling members · CPC title

• G02B7/022

  lens and mount having complementary engagement means, e.g. screw/thread · CPC title

• G02B2003/0093

  characterised by the shape · CPC title