WIDE-ANGLE LENS

摘要

PROBLEM TO BE SOLVED: To provide a wide-angle lens capable of obtaining line light having uniform line intensity. SOLUTION: A ceiling wide-angle lens part 17 that is the wide-angle lens for widening the angle of a laser beam 14A from a laser light source 14 into line light with an angle of 220°includes: a first cylindrical lens 171 layered and arranged in a direction connecting the side nearest the incident side 17A and the side nearest the emission side 17B; a first sub-cylindrical lens 172; and a second sub-cylindrical lens 173. The first cylindrical lens 171 has a concave lens face 171B on the incident side and a convex lens face 171A on the emission side. The first sub-cylindrical lens 172 has concave lens faces 171B and 171A on the incident side and the emission side, respectively. The second sub-cylindrical lens 173 is identical in shape to that of the first sub-cylindrical lens 172. COPYRIGHT: (C)2007,JPO&INPIT