Patent ID: 6855958

Claim:
A wavelength conversion element for car use comprising: a heat conductive base having a cavity having an opening and a bottom surface and a side surface forming an angle Θ 2 therebetween; at least one chip fitted to said cavity, said at least one chip for emitting light; and a wavelength conversion part, which converts a portion of or the total emitted light from said at least one chip, to visible rays, arranged adjacent to said at least one chip; wherein: said at least one chip is a light emitting semiconductor and comprises at least one active layer which emits UV or blue light; said at least one chip has at least one straight side in its plan view; said angle Θ 2 formed between the bottom and the side surface of said cavity is more than 0° and less than 90°; said cavity having at least one straight side at the opening; and a ratio of the opening area of said cavity to the total of the areas of said at least one chip in the plan view, is less than three.