| 摘要 |
PURPOSE: An imaging lens is provided to implement an excellent aberration property by using a third lens having a plane-convex lens. CONSTITUTION: A first optic(10) has a positive power. A second lens(20) has a negative power. A third lens(30) has a positive power. A fourth lens(40) has a negative power. The first, second, third, fourth lens are arranged from an object side in order. An iris diaphragm(15) is interposed between the first and second lens. The both sides of the second lens has a Bi-Concave. The third lens is formed with a Plano-Convex lens. |
