| 摘要 |
<p>PURPOSE:To easily form arbitrary light distribution pattern by means of a compact constitution by emitting the incident light entering the light incident end part of the optical fiber flux from the light emitting end face, and selecting appropriately the optical fiber which functions as an optical path. CONSTITUTION:A discharge part of a valve 12 is positioned at the first focal position f1 of a light reflective surface 11 of a reflector 10, and the emitted light from the discharge part is collected at the second focal position f2 of the reflector 10. Light incident end parts of a pair of the optical fiber fluxes 20A, 20B are positioned at the second focal position, and the incident light from the light source is emitted from the branched optical fibers 22a-22c, and at the same time, light distribution is made in the forward direction through a collimator lens 28 and a diffusion lens 29. Further, the light incident end faces 20a, 20b are positioned alternatively for the second focal position f2 by sliding a mouthpiece 24A to either side. Changeover of the optical path is alternatively made between the optical fiber 20A and 20B, leading to a changeover between a main beam and a low beam.</p> |
