Light emitting device and lighting system having the same
Disclosed are a light emitting device and a lighting system which uses a light emitting diode. The light emitting device includes a body which has a first and a second sidewall. The sidewalls have a first length and a corresponding third and fourth sidewalls. The third and fourth sidewalls are close to the first and second sidewalls and have a second length shorter than the first length, and a concave portion which has an open upper portion. A first lead frame is disposed in the concave portion of the body which includes a first cavity having a depth lower than a bottom of the concave portion. Also, a second lead frame is disposed in the concave portion of the body and includes a second cavity having a depth lower than the bottom of the concave portion. There is a gap part between the first and second lead frames. In the first cavity is a light emitting chip, and in the second cavity there is a light emitting chip.
1. A light emitting device comprising:
a body including first and second sidewalls having a first length and corresponding to each other, third and fourth sidewalls close to the first and second sidewalls and having a second length shorter than the first length, and a concave portion having an open upper portion;
a first lead frame disposed in the concave portion of the body and including a first cavity having a depth lower than a bottom of the concave portion;
a second lead frame disposed in the concave portion of the body and including a second cavity having a depth lower than the bottom of the concave portion;
a gap part between the first and second lead frames;
a first light emitting chip in the first cavity and on the first lead frame; and
a second light emitting chip in the second cavity and on the second lead frame,
wherein the first lead frame comprises a first lead part protruding to the third sidewall of the body, and a first single support protrusion in the first sidewall of the body, and
wherein the second lead frame comprises a second lead part protruding to the fourth sidewall of the body, and a second single support protrusion in the second sidewall of the body,
wherein a straight central line extends from the first sidewall, through a center of the gap part and to the second sidewall in a straight line, wherein the first light emitting chip on the first lead frame and the first single support protrusion are on a first side of the central line, and the second light emitting chip on the second lead frame and the second single support protrusion are on a second side of the central line, the second side being opposite to the first side, and the first single support protrusion and the second single support protrusion are asymmetrically located with respect to the straight center line that extends from the first sidewall having the first single support protrusion to the second sidewall having the second single support protrusion,
wherein the first single support protrusion has a thickness equal to a thickness of the first lead frame under the first light emitting chip, and
wherein the second single support protrusion has a thickness equal to a thickness of the second lead frame under the second light emitting chip.
2. The light emitting device of claim 1 , wherein the first and second single support protrusions are disposed at a position higher than a bottom of the body and lower than an upper portion of the body.
3. The light emitting device of claim 1 , wherein the first and second single support protrusions have a width narrower than widths of top surfaces of the first and second light emitting chips.
4. The light emitting device of claim 1 , wherein the first sidewall and the second sidewall are inclined with respect to an axis perpendicular to a bottom of the body, and top surfaces and bottom surfaces of the first and second single support protrusions are coupled in the body.
5. The light emitting device of claim 1 , wherein the first single support protrusion is disposed closer to the third sidewall of the body than to the fourth sidewall of the body, and the second single support protrusion is disposed closer to the fourth sidewall of the body than to the third sidewall of the body.
6. The light emitting device of claim 1 , wherein the first length is at least three times longer than the second length, and bottom surfaces of the first and second cavity are disposed in an open region of a bottom surface of the body.
7. The light emitting device of claim 1 , wherein the first and second single support protrusions have a width in a range of 50 μm to 500 μm.
8. A light emitting device comprising:
a body including a concave portion having an open upper portion;
a first lead frame disposed in the concave portion of the body and including a first cavity having a depth lower than a bottom of the concave portion;
a second lead frame disposed in the concave portion of the body and including a second cavity having a depth lower than the bottom of the concave portion;
a gap part between the first and second lead frames;
a first light emitting chip in the first cavity and on the first lead frame;
a second light emitting chip in the second cavity and on the second lead frame; and
a molding member in the first cavity and the second cavity,
wherein a body comprises first and second sidewalls having a first length and corresponding to each other, and third and fourth sidewalls close to the first and second sidewalls and having a second length shorter than the first length,
wherein the first lead frame comprises a first support part disposed on a bottom of the concave portion of the body, and a first single support protrusion in the first sidewall of the body,
wherein the second lead frame comprises a second support part disposed on a bottom of the concave portion of the body, and a second single support protrusion in the second sidewall of the body, and
wherein the first single support protrusion and the second single support protrusion are disposed at a position higher than bottom surfaces of the first and second light emitting chips based on a bottom of the body,
wherein a straight central line extends from the first sidewall, through a center of the gap part and to the second sidewall in a straight line, wherein the first light emitting chip on the first lead frame and the first single support protrusion are on a first side of the central line, and the second light emitting chip on the second lead frame and the second single support protrusion are on a second side of the central line, the second side being opposite to the first side, and the first single support protrusion and the second single support protrusion are asymmetrically located with respect to the straight center line that extends from the first sidewall having the first single support protrusion to the second sidewall having the second single support protrusion,
wherein the first single support protrusion has a thickness equal to a thickness of the first lead frame under the first light emitting chip, and
wherein the second single support protrusion has a thickness equal to a thickness of the second lead frame under the second light emitting chip.
9. The light emitting device of claim 8 , wherein the first support part comprises a first extension portion extending in a direction of the first sidewall of the body and connected to the first single support protrusion, and
the second support part comprises a second extension portion extending in a direction of the second sidewall of the body and connected to the second single support protrusion.
10. The light emitting device of claim 8 , wherein at least one of the first and second support protrusions has a width narrower than widths of top surfaces of the first and second light emitting chips.
11. The light emitting device of claim 8 , wherein the first to fourth sidewalls are inclined with respect to a bottom of the body, and the first length is at least three times longer than the second length.