OPTICAL LENS, AND LIGHT UNIT AND LIGHTING DEVICE HAVING SAME

• US 20190063694A1
• Filed: 02/17/2017
• Published: 02/28/2019
• Est. Priority Date: 02/17/2016
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: KANG, Min Soo
• Granted Patent: US 10,641,442 B2
• Time in Patent Office: Days
• CPC Class Codes: F21K 9/69 Details of refractors forming part of the light source
• CPC Class Codes: F21S 4/26 of rope form, e.g. LED lighting ropes, or of tubular form
• CPC Class Codes: F21V 17/002 with provision for interchangeability, i.e. component parts being especially adapted to be replaced by another part with the same or a different function F21V17/10 takes precedence
• CPC Class Codes: F21V 17/005 with keying means, i.e. for enabling the assembling of component parts in distinctive positions, e.g. for preventing wrong mounting
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21V 5/045 the lens having discontinuous faces, e.g. Fresnel lenses
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 19/00 Condensers, e.g. light collectors or similar non-imaging opticsfor microscopes G02B21/08
• CPC Class Codes: G02B 19/0028 refractive and reflective surfaces, e.g. non-imaging catadioptric systems
• CPC Class Codes: G02B 19/0066 in the form of an LED array
• CPC Class Codes: G02B 3/00 Simple or compound lenses
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H05K 1/181 associated with surface mounted components
• CPC Class Codes: H05K 2201/10106 : Light emitting diode [LED]

Abstract

An optical lens in embodiment discloses: first and second bottom surfaces spaced apart from each other and having a longer in a second axial direction than to a first axial direction at a lower portion of a transparent body; a concave recess between the first and second bottom surfaces; plurality of incident surfaces having a first incident surface on the recess, second and third incident surfaces corresponding to each other on both sides of the recess; first and second total reflective surfaces disposed on opposite sides of the body; and a first exit surface on the body; and second and third exit surfaces on a both sides the first exit surface.

Claims

1. An optical lens comprising:

first and second bottom surfaces spaced apart from each other and having a long length in a second axial direction perpendicular to a first axial direction at a lower portion of a transparent body;

a concave recess between the first and second bottom surfaces;

plurality of incident surfaces having a first incident surface on the recess, a second incident surface and a third incident surface corresponding to each other on both sides of the recess;

first total reflective surface and a second total reflective surface disposed on opposite sides of the body;

a first exit surface having a long length in the second axial direction on the body and overlapping with the recess in a vertical direction;

a second exit surface disposed between the first exit surface and the first total reflective surface; and

a third exit surface disposed between the first exit surface and the second total reflective surface,

wherein the second incident surface is disposed between the first bottom surface and the first incident surface,

wherein the third incident surface is disposed between the second bottom surface and the second incident surface,

wherein the second and third incident surfaces include a curved surface convex in a direction of the recess,

wherein the first and second total reflective surfaces include a convex curved surface in an outward direction of the body,

wherein the first total reflective surface is disposed between the first bottom surface and the second exit surface, and

wherein the second total reflective surface is disposed between the second bottom surface and the third exit surface.

2. The optical lens of claim 1, wherein the first incident surface includes a convex curved surface or a plane, and the second and third incident surfaces include a surface perpendicular to a lower portion of the convex curved surface thereof.

3. The optical lens of claim 1, wherein the first exit surface include a convex curved surface having a width wider than a width of the first incident surface,

wherein the second and third exit surfaces are spaced apart from the first exit surface, and

wherein a height of an outer edge of the second and third exit surfaces is disposed lower than a peak of the first exit surface.

4. The optical lens of claim 3, wherein the first bottom surface overlaps the first exit surface and the second exit surface in the vertical direction,

wherein the first total reflective surface overlaps the second exit surface in the vertical direction,

wherein the second bottom surface overlaps the first and third exit surfaces in the vertical direction, and

wherein the second total reflective surface overlaps the third exit surface in the vertical direction.

5. The optical lens of claim 4, wherein a length of the body in the second axial direction is four times or more a length in the first axial direction, and a thickness of the body is greater than a width of the body in the first axial direction.

6. The optical lens of claim 4, wherein a first angle between straight lines connecting both edges of the first incident surface with respect to a bottom center of the recess is greater than a second angle between straight lines connecting both edges of the first exit surface, and

wherein a third angle between straight lines passing through an outer edge of the second and third exit surfaces with respect to a bottom center of the recess is greater than the first angle.

7. The optical lens of claim 3, further comprising:

a first surface between the second incident surface and the first bottom surface;

a second surface between the third incident surface and the second bottom surface;

a third surface between the first total reflective surface and the first bottom surface; and

a fourth surface between the second total reflective surface and the second bottom surface,

wherein the first to fourth surfaces has a long length along the second axis direction of the body,

wherein a height of the third and fourth surfaces is higher than a height of the first and second surfaces, and

wherein the first and second surfaces face each other.

8. The optical lens of claim 7, wherein the third and fourth surfaces comprise a vertical plane, and

wherein the first and second surfaces include at least one of a vertical plane, a concave curved surface, and a sloped surface.

9. The optical lens of claim 7, wherein the first surface and the second surface are spaced apart from each other and have a wider interval away from the first and second bottom surfaces, and

wherein the height of the third and fourth surfaces is in a range of 1.1 times to 1.2 times the height of the first and second surfaces.

10. A light unit comprises:

an optical lens;

a plurality of light emitting devices disposed in a recess of the optical lens; and

a circuit board under the light emitting device,

wherein the optical lens is the optical lens of claim 4.

11. An optical lens comprising:

first and second bottom surfaces spaced apart from each other and having a long length in a second axial direction perpendicular to a first axial direction at a lower portion of a transparent body;

a concave recess between the first and second bottom surfaces;

plurality of incident surfaces having a first incident surface on the recess, a second incident surface and a third incident surface corresponding to each other on both sides of the recess;

a first exit surface having a long length in the second axial direction on the body and overlapping with the recess in a vertical direction;

second and third exit surfaces spaced apart from each other in the first axis direction and having a long length in the second axis direction;

a first total reflective surface between the second exit surface and the first bottom surface; and

a second total reflective surface between the third exit surface and the second bottom surface,

wherein the plurality of incident surfaces includes a first incident surface on the recess, a second incident surface between the first incident surface and the first bottom surface, and a third incident surface between the first incident surface and the second bottom surface,

wherein the first incident surface includes a convex curved surface toward a bottom of the recess,

wherein the first exit surface includes a convex curved surface,

wherein the convex curved surface of the first exit surface includes a curvature radius smaller than a curvature radius of the curved surface of the first incident surface.

12. The optical lens of claim 11, wherein the second and third incident surfaces include convex curved surfaces in a direction of the recess.

13. The optical lens of claim 11, wherein a lower width of the first exit surface is wider than a width of the first incident surface in the first axial direction,

wherein the second and third exit surfaces include inclined surfaces having a gradually higher height toward an outside from the first exit surface, and

wherein heights of an outer edges of the second and third exit surfaces are disposed lower than an peak of the first exit surface.

14. The optical lens of claim 13, wherein the first bottom surface overlaps the first exit surface and the second exit surface in the vertical direction,

wherein the first total reflective surface overlaps with the second exit surface in the vertical direction,

wherein the second bottom surface overlaps the first and third exit surfaces in the vertical direction, and

wherein the second total reflective surface overlaps the third exit surface in the vertical direction.

15. The optical lens of claim 14, wherein a length of the body in the second axial direction is at least four times a width of the body in the first axial direction, and

wherein a thickness of the body is greater than the width of the body in the first axial direction.

16. The optical lens of claim 11, wherein a first angle between straight lines connecting both edges of the first incident surface with respect to a bottom center of the recess is greater than a second angle between straight lines connecting both edges of the first exit surface.

17. The optical lens of claim 16, wherein a third angle between straight lines passing through an outer edge of the second and third exit surfaces with respect to the bottom center of the recess is greater than the first angle.

18. The optical lens of claim 13, further comprising:

a first surface between the second incident surface and the first bottom surface, a second surface between the third incident surface and the second bottom surface, a third surface between the second total reflective surface and the second bottom surface, and a fourth surface between the second total reflective surface and the second bottom surface,

wherein the first to fourth surfaces have a long length along the second axial direction of the body,

wherein the first surface is bent from the second incident surface toward the first bottom surface,

wherein the second surface is bent from the third incident surface toward the second bottom surface, and

wherein a heights of the third and fourth surfaces are higher than a heights of the first and second surfaces.

19. The optical lens of claim 18, wherein the third and fourth surfaces comprise a vertical surface,

wherein the third surface is bent from the first total reflective surface toward the first bottom surface,

wherein the fourth surface is bent from the second total reflective surface toward the second bottom surface,

wherein the first and second surfaces comprise at least one of a vertical surface, a concave curved surface, or a sloped surface.

20. The optical lens of claim 18, wherein the first surface and the second surface are spaced apart from each other by a greater distance from the first and second surfaces,

wherein the third and fourth surfaces overlap the second and third incident surfaces in the first axis direction, and

wherein the heights of the third and fourth surfaces have a range of 1.1 to 1.2 times the height of the first and second surfaces.