| 摘要 |
<p><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. When R2 represents the radius of curvature of the surface on the image side of the first lens L1, D2 represents a distance on the optical axis from the surface on the image side of the first lens L1 to the surface on the object side of the second lens L2, and f represents the focal length of the entire system, the image pickup lens satisfies the following conditional expressions (5) and (9): (5) 3.04<R2/f<3.66, and (9) D2/f<1.88. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
