| 发明名称 |
IMAGING LENS |
| 摘要 |
A compact low-priced imaging lens which offers a field of view of about 180 degrees and high optical performance. The imaging lens for a solid-state image sensor includes, in order from an object side to an image side, a first lens with negative refractive power having a convex object-side surface and an aspheric image-side surface; a second lens with negative refractive power as a double-sided aspheric lens having a concave surface on the image side; a third lens with positive refractive power; an aperture stop; and a fourth lens with positive refractive power. The first and second lenses are made of plastic material. The imaging lens satisfies conditional expressions (1) and (2) below:;−65.0<f1/f<−17.0 (1);0.04<f2/f1<0.14 (2)wheref: focal length of the overall optical system of the imaging lensf1: focal length of the first lensf2: focal length of the second lens. |
| 申请公布号 |
US2015277086(A1) |
申请公布日期 |
2015.10.01 |
| 申请号 |
US201514637697 |
申请日期 |
2015.03.04 |
| 申请人 |
KANTATSU CO., LTD. |
发明人 |
Yonezawa Tomohiro |
| 分类号 |
G02B13/04;G02B13/00;G02B9/34 |
主分类号 |
G02B13/04 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. An imaging lens in which elements are arranged in order from an object side to an image side, comprising:
a first lens with negative refractive power having a convex surface on the object side and an aspheric surface on the image side; a second lens with negative refractive power as a double-sided aspheric lens having a concave surface on the image side; a third lens with positive refractive power; an aperture stop; and a fourth lens with positive refractive power, wherein the first lens and the second lens are made of plastic material; and conditional expressions (1) and (2) below are satisfied:
−65.0<f1/f<−17.0 (1)0.04<f2/f1<0.14 (2) where f: focal length of an overall optical system of the imaging lens f1: focal length of the first lens f2: focal length of the second lens. |
| 地址 |
Yaita-shi JP |
