公开(公告)号：US20150070754A1

公开(公告)日：2015-03-12

申请号：US14386501

申请日：2013-03-21

Applicant: TAMRON CO., LTD.

Inventor： Shoko Kawai

IPC: G02B9/10 ,  G02B13/14

CPC classification number: G02B9/10 ,  G02B13/14

Abstract: An infrared optical system of two-lens structure comprises a front or first lens of negative refractive power and a rear or second lens of positive refractive power disposed in series relative to an object, the first lens having its concave surface faced toward the imaging plane, the second lens having its convex surface faced toward the object, the infrared optical system meeting the requirements as defined in the following formula 2.1≦d/f≦11, where d is an axial distance from the surface of the first lens closer to the imaging plane to the surface of the second lens closer to the object, and f is a focal length of the entire optical system.

Abstract translation: 双透镜结构的红外光学系统包括负屈光力的前或第一透镜和相对于物体串联设置的正折射力的后或后透镜，第一透镜的凹面朝向成像面， 第二透镜具有朝向物体的凸面，红外光学系统满足如下公式2.1＆nlE; d / f＆nlE; 11中定义的要求，其中d是距离第一透镜表面更接近 成像平面到靠近物体的第二透镜的表面，f是整个光学系统的焦距。