| 摘要 |
Disclosed is an imaging lens. The lens, from an object side to an image side, successively comprises: a first lens (E1) having positive refractive power, and an object side surface (S1) thereof being a convex surface; a second lens (E2) having negative refractive power, and an image side surface (S4) thereof being a concave surface; a third lens (E3) having refractive power; a fourth lens (E4) having refractive power; and a fifth lens (E5) having negative refractive power. A composite lens of the third lens (E3) and the fourth lens (E4) has negative refractive power. The imaging lens satisfies the following relations: 2.0<f/ImgH<3.0, and 0<f1/f<0.5, wherein f is an effective focal length of the imaging lens, ImgH is half of the diagonal length of an effective pixel region on an imaging surface (S13) of the imaging lens, and f1 is an effective focal length of the first lens (E1). By satisfying the above-mentioned configuration, it can be guaranteed that an imaging lens has a long-focus property, and has a small depth of field and a relatively large magnification. At the same time, it is favourable for shortening the total length of the lens of an imaging lens so as to guarantee the miniaturization of the imaging lens. By cooperating with a wide angle lens, the imaging lens has a relatively large magnification and a relatively high resolution in the case of automatic focusing. |
