| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain an emission light having near parallel rays with a small luminous intensity distribution beam angle even when a length of the emission light is greater than a prescribed value by a method wherein the light which is incident from an end face of a light introduction rod passes through the inner section of the rod and is deflected in a perpendicular direction by a prism to be incident on an inner section of a light transmission rod. SOLUTION: Lights from lamps 20a, 20b which are incident on each of inner sections of respective light introduction and light transmission rods 16a, 16b from each of the end faces are deflected in the perpendicular directions by respective prisms 14a, 14b to be incident on inner sections of a light emission/ transmission rod 12 from its both end face sections 12a, 12b. The lights incident on the inner section of the rod 12 is reflected to be diffused by diffusion fringes 28. The lights which are emitted from the inner sections by lens operations of the rod 12 each having a directivity to the opposite direction of the respective diffusion fringe 28 becomes a line type light such that the light is extended to an axis direction of the rod 12. As a result, even when the length of the light is greater than 500mm, it is possible to obtain the emission light having near parallel rays with a small luminous intensity distribution beam angle.</p> |
