| 摘要 |
An embodiment includes a substrate, a light source part which is arranged on the substrate and includes at least one light emitting device, and a lens arranged on the light source part. The lens includes a light entering surface and a light exiting surface which transmits the light passing through the light entering surface. The ratio of a first distance and a second distance to the light entering surface is less than 1. The ratio of the first distance and the second distance to the light exiting surface is 1 to 2.2. The first distance on the light entering surface is a distance between the lowermost light entering surface located on a side based on a first reference surface and the first reference surface. The second distance to the light entering surface is a distance between the lowermost light exiting surface located on a side based on the first reference surface and the first reference distance. The second distance to the light exiting surface is a distance between the lowermost light exiting surface located on the other side based on the first reference surface and the first reference surface. The first reference surface is vertical to a surface on which the light source part is placed, and passes through the center of the light source part. |
