| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of welding at a lens part when being molded. SOLUTION: Regarding the optical lens 17 including the lens part 17A having a concave cross section shape in a short-length direction, and a flange part 17B located outside the lens part 17A, the maximum thickness X of the flange part 17B and the minimum thickness Y of the lens part 17A satisfy the following relational expressions: 0.3≤X/Y≤0.9, 2.0 mm≤X≤3.0 mm and 3.2 mm≤Y≤7.5 mm. COPYRIGHT: (C)2009,JPO&INPIT |
