| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a wide-angle imaging lens being robust against temperature change, compact and lightweight, and having excellent optical performance. <P>SOLUTION: The imaging lens includes four lenses which are, in order from an object side, a first lens 110 which is a meniscus lens having negative refractive power with its convex surface facing the object side, a second lens 120 having negative refractive power with its convex surface facing the object side, a third lens 130 having positive refractive power with its convex surface facing the object side, an aperture stop 140, and a fourth lens 150 having positive refractive power with its convex surface facing an image side. When the focal length of the second lens 120 is f2, and the focal length of the fourth lens 150 is f4, a conditional expression: -0.9≤f2/f4≤-1.1 is satisfied. <P>COPYRIGHT: (C)2013,JPO&INPIT |
