| 摘要 |
<P>PROBLEM TO BE SOLVED: To implement a compact, inexpensive, wide-angle, and high-performance image pickup lens and eliminate restrictions on an image pickup element to be used. <P>SOLUTION: An image pickup lens 1 comprises substantially six lenses, in order from an object side: a negative first lens L1; a negative second lens L2; a positive third lens L3; a positive fourth lens L4; a negative fifth lens L5; and a positive sixth lens L6. The surface on the object side of the third lens L3 is a recessed surface. When R9 represents the radius of curvature of the surface on an image side of the fourth lens L4, and f represents the focal length of the entire system, the image pickup lens satisfies the following conditional expression (12): -6.2<R9/f<-2.52. <P>COPYRIGHT: (C)2013,JPO&INPIT |
