| 主权项 |
1. A wide-angle lens for use in imaging an object, the wide-angle lens comprising:
a first lens which is a plastic lens having first and second faces that are aspherical and having a negative meniscus shape with a convex surface facing an object side; a second lens which is a plastic lens in a biconvex shape having at least one aspherical face; a third lens which is a plastic lens in a biconvex shape having at least one aspherical face; and a diaphragm which is provided between the second lens and the third lens; wherein the first lens, the second lens, and the third lens are disposed such that the first lens is closest to the object side, the second lens is between the first lens and the third lens; and wherein when a radius of curvature at a center of the second face located on an image side of the first lens is “R12” (mm) and a focal length of the wide-angle lens is “f0”(mm), a following condition is satisfied:
R12/f0≦0.9 |
