| 摘要 |
PURPOSE: To prevent attenuation of light to be converged by a light converging optical system, blur of a light emitting spot, and unnecessary beam, by specifying a difference in height between a bottom end of a light emitting layer of an end emission type light emitting element and a top face of a protrusion. CONSTITUTION: In an end emission type LED array 10, when an overhanding dimension of a protrusion 23 is L, a light converging angle of a light converging optical system to be used in opposition to the end emission type LED array 10 is θ, and a difference in height between a bottom end of a light emitting layer 13 and a face which has been a bottom face of the removed protrusion 23 is h, the difference in height h is set to a value which satisfies h>=L.tanθ. The overhanging dimension L is of a value previously decided in consideration of impact at separation by cutting. The light converging angle θ of the light converging optical system is of a value previously decided by the light converging optical system to be used. |
