| 摘要 |
PROBLEM TO BE SOLVED: To provide an imaging lens for a compact solid state image sensor which is low in cost and has good optical performance, and also to provide an imaging apparatus using the same. SOLUTION: The imaging lens 1 constituted of three glass lenses is constituted by arranging a first lens L1 having positive refractive power and whose convex surface is turned toward an object side, an aperture diaphragm S, a second lens L2 having negative refracting power and whose convex surface is turned toward the image side, and a third lens L3 having positive refracting power and whose concave surface is turned toward the image side, in the order from the object side. All the lens surfaces are constituted of aspherical surfaces and the imaging lens satisfies the following conditional expressions (A0): f/f2<-0.9 and (A1): 2<¾R21-R22¾/¾R21+R22¾<5, where f: the focal length of the entire system of the lens; f2: the focal length of the second lens L2; R21: the radius of curvature of the object side lens surface of the second lens L2; R22: the radius of curvature of the image side lens surface of the second lens L2. COPYRIGHT: (C)2006,JPO&NCIPI
|
