WIDE-ANGLE LENS FOR FAR-INFRARED CAMERA

摘要

The present invention provides a wide angle lens for a far-infrared camera, the wide angle lens comprising: a first lens which is a meniscus lens convex with respect to an object and has a positive refractive index; a second lens which is a meniscus lens disposed on the rear side of the first lens and convex in a direction opposite to the first lens and has a positive refractive index; and an infrared filter through which only far-infrared rays among all rays introduced therein pass, the infrared filter being disposed on the rear side of the second lens, wherein the focal distance between the first lens and the second lens satisfies equation (1) and the dispersion rate of the second lens satisfies equation (2). In the above-described wide angle lens according to the present invention, the shape of lens used is optimized, thereby obtaining a wide view angle using only the smaller number of lenses and reducing the distortion factor of the wide view angle with respect to far-infrared rays.