| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve utilization efficiency of light source luminous flux of a direct radiation type lamp for a vehicle provided with a light distribution pattern having cutoff lines on an upper end part. <P>SOLUTION: A light emitting element 14 is arranged forward by arranging an end point on a vehicle side of a lower end edge 14a1 of a rectangular-shaped light-emitting chip 14a at a back side focus F of a convex lens 12. An additional lens 22 for surrounding the convex lens 12 in a band shape is arranged around the convex lens 12. The additional lens 22 includes an incident surface 22b, a reflection surface 22c, and an emission surface 22a, and is divided into eight fan-shaped regions 22A-22H in a circumferential direction with respect to an optical axis Ax. This division is carried out in every angle range where a corner point on an outer peripheral edge of the light emitting chip 14a corresponding to a point positioned on an uppermost end is a same corner point on an image of the light emitting chip 14a formed on the reflection surface 22c by light reaching an optional point on the incident surface 22b. Thereby, an additional light distribution pattern having horizontal cutoff lines can be formed. <P>COPYRIGHT: (C)2010,JPO&INPIT |
