| 摘要 |
A lighting device may be provided that includes: a heat sink; a member which has a polygonal pillar shape having at least three sides and is disposed on the heat sink, wherein the sides are inclined at a predetermined angle toward the center of the heat sink; and a light source which is disposed on at least one among the sides of the member, wherein the light source includes: a substrate; at least two light emitting devices which are symmetrically disposed on the substrate with respect to the center of the substrate; and at least two lens units which are disposed on the light emitting devices respectively, and consequently, it is possible to meet U.S. Energy Star and ANSI specifications, to remarkably improve rear light distribution characteristics and to remove a dark portion. |
| 主权项 |
1. A lighting device comprising:
an optically transmissive enclosure having a hollow interior; a heat sink including
a base coupled to the enclosure, the base having a body with a planar upper surface, andan extension extending from the upper planar surface of the base into the hollow interior of the optically transmissive enclosure in a first direction, which is perpendicular to the upper planar surface, the extension including a lower end proximate to an upper end of the base, an upper end, and a plurality of side walls provided between the lower end and the upper end, the plurality of side walls having first and second walls, which are opposing walls, a first distance in a second direction between upper ends of the first and second walls is less than a second distance between lower ends of the first and second walls, the second direction being perpendicular to the first direction; and a first light source provided on a first surface provided between the upper and lower ends of the first wall and a second light source provided on a second surface between the upper and lower ends of the second wall, each of the first and second light sources includes a plurality of light emitting devices provided on a substrate having a rectangular shape and a first lens module having the rectangular shape provided over the light emitting devices and the substrate of the first light source and a second lens module having the rectangular shape provided over the light emitting devices and the substrate of the second light source. |
