Lens, light-emitting device package including the lens, and lighting apparatus including the package
Embodiments provide a light-emitting device package including at least one light source and a lens disposed on the light source. The lens includes a lower surface facing the light source, an upper surface opposite to the lower surface, and a side surface located between the lower surface and the upper surface, the side surface having at least one indented portion.
1. A light-emitting device package, comprising:
at least one light source; and
a lens disposed on the light source,
wherein the lens includes:
a lower surface facing the light source;
an upper surface opposite to the lower surface; and
a side surface located between the lower surface and the upper surface, the side surface having a plurality of indented portions;
wherein the side surface of the lens comprises:
a lower portion below the indented portions; and
an upper portion above the indented portions, and
wherein widths of the indented portions decrease as approaching from the lower portion to the upper portion.
2. The package according to claim 1 , wherein the lower portion has a greater width than a width of the upper portion.
3. The package according to claim 1 , wherein the indented portions are located at a middle height position of the lens.
4. The package according to claim 1 , wherein each of the indented portions is indented in a linear form.
5. The package according to claim 1 , wherein each of the indented portions is indented in a curvilinear form.
6. The package according to claim 1 , wherein the upper surface of the lens has the form of an upper recess configured to be concave toward the light source.
7. The package according to claim 1 , wherein the lower surface of the lens has the form of a lower recess configured to receive at least a portion of the light source.
8. The package according to claim 7 , further comprising:
a board configured to allow the light source to be mounted thereon; and
a wavelength converter disposed between the lens and the light source.
9. The package according to claim 8 , further comprising a lens support part configured to support the lens, the lens support part being disposed on the board,
wherein the light source is disposed in a space defined by the lens support part, the lower surface of the lens, and an upper surface of the board.
10. The package according to claim 8 , wherein the wavelength converter is disposed to surround an upper surface and a side surface of the light source.
11. The package according to claim 10 , wherein the lower surface of the lens includes:
a central lower surface located in a path of a light axis of the light source, the central lower surface facing the light source and corresponding to a top surface of the recess; and
a peripheral lower surface disposed around the central lower surface.
12. The package according to claim 11 , wherein the lower surface of the lens further includes a boundary lower surface disposed between the central lower surface and the peripheral lower surface.
13. The package according to claim 12 , wherein the wavelength converter is disposed between the upper surface of the light source and the central lower surface of the lens, between the side surface of the light source and the boundary lower surface of the lens, and between a portion of an upper surface of the board, on which the light source is not mounted, and the peripheral lower surface.
14. The package according to claim 1 , wherein the lower surface of the lens has a flat shape.
15. The package according to claim 1 , wherein the side surface of the lens includes:
a lower side surface of the lower portion below the indented portions; and
an upper side surface of the upper portion above the indented portions.
16. The package according to claim 15 , wherein the side surface of the lens further includes a central side surface between the lower side surface and the upper side surface, the indented portions being located at the central side surface.
17. The package according to claim 1 ,
wherein the number of the indented portions increases as a width of the lens increases.
18. The package according to claim 1 , wherein the indented portions of the lens have a symmetrical shape about a light axis.
19. A lighting apparatus comprising:
the light-emitting device package according to claim 1 ; and
an optical member disposed above the light-emitting device package.
20. A lens, comprising:
a light introduction surface facing a light source on which the lens is disposed;
a first light emission surface opposite to the light introduction surface; and
a second light emission surface located between the light introduction surface and the first light emission surface, the second light emission surface having a plurality of indented portions,
wherein the lens has a greater lower width than an upper width thereof,
wherein the second light emission surface of the lens comprises:
a lower portion below the indented portions; and
an upper portion above the indented portions, and
wherein widths of the indented portions decrease as approaching from the lower portion to the upper portion.