Illumination lens and illumination unit including the same
An illumination lens including a first part being free of prismatic patterns, a second part including prismatic patterns on both sides of the first part and configured to increase light distribution in the both sides of the first part, and a lens cover covering the first and second parts with the first and second parts being disposed on a substantially same plane under the lens cover.
1. An illumination lens, comprising:
a first part being free of prismatic patterns to distribute light outside a width of the first part;
a second part including prismatic patterns on a side of the first part and increase light distribution in a side of the first part; and
a lens cover covering the first and second parts; wherein the first and second parts are disposed on a substantially same plane under the lens cover.
2. The illumination lens of claim 1 , wherein the lens cover includes first and second edges extending from first and second outer surfaces of the second part and configured to be engaged with a gap member separating a board including light emitting diodes.
3. The illumination lens of claim 1 , wherein the lens cover includes first and second edges extending horizontally from first and second outer surfaces of the second part and protruding vertically so as to maintain a separation of the illumination lens from a board including light emitting diodes.
4. The illumination lens of claim 1 , wherein the first part, the second part and the lens cover are integrally formed together as a single unit.
5. The illumination lens of claim 1 , wherein the first part has a semicircular shape or a polygonal shape.
6. The illumination lens of claim 1 , wherein the second part is axisymmetrically disposed about the first part.
7. The illumination lens of claim 1 , wherein each pattern of the prismatic part has a triangular shape.
8. The illumination lens of claim 1 , wherein the prismatic patterns are randomly disposed.
9. The illumination lens of claim 1 , wherein the prismatic patterns are arranged on both sides of the cylindrical part with a predetermined distance from each other.
10. The illumination lens of claim 1 , wherein distances between the prismatic patterns become gradually narrower as the prismatic patterns move away from the first part.
11. The illumination lens of claim 1 , wherein the prismatic patterns are constant in size.
12. The illumination lens of claim 1 , wherein the lens cover comprises an aspherical lens or a spherical lens.
13. The illumination lens of claim 1 , wherein the width of the first part is about ⅓ to about 1/10 the width of a diameter of the lens cover.
14. An illumination unit, comprising:
an illumination lens including a first part being free of prismatic patterns to distribute light outside a width of the first part;
a second part including prismatic patterns on a side of the first part and increase light distribution in said both sides of the first part;
a lens cover covering the first and second parts with said first and second parts being disposed on a substantially same plane under the lens cover; and
a light emitting module disposed under the illumination lens and including a plurality of light emitting diodes mounted on a board.
15. The illumination unit of claim 14 , further comprising:
a gap member configured to maintain a gap between the board and the illumination lens.
16. The illumination unit of claim 15 , wherein the gap member is disposed on an outer circumference between the illumination lens and the board.
17. The illumination unit of claim 15 , wherein the gap member includes a reflective plate inclinedly disposed between the board and the prismatic patterns.
18. The illumination unit of claim 15 , wherein the gap member includes a resin material or a glass material.
19. The illumination unit of claim 15 , wherein the lens cover includes first and second edges extending horizontally from first and second outer surfaces of the second part and protruding vertically so as to maintain a separation of the illumination lens from the board.
20. The illumination unit of claim 15 , wherein the gap member includes a resin material with phosphor between the illumination lens and the board.
21. The illumination unit of claim 14 , further comprising:
a reflective plate coupled to the board and having a plurality of holes for receiving the plurality of light emitting diodes.
22. The illumination unit of claim 14 , wherein the illumination lens distributes light in a pattern having a rectangular shape.
23. The illumination unit of claim 14 , wherein at least one of the light emitting diodes is disposed under the first part of the illumination lens.
24. The illumination unit of claim 14 , further comprising:
a reflective material on a top surface of the board and configured to reflect light emitted by the light emitting diodes.