公开(公告)号：US20160170179A1

公开(公告)日：2016-06-16

申请号：US14830141

申请日：2015-08-19

Applicant: TAMRON CO., LTD.

Inventor： Kotaro JOJIKI

IPC: G02B13/00 ,  G02B27/00 ,  G02B9/60

CPC classification number: G02B13/0045 ,  G02B7/028 ,  G02B9/60 ,  G02B27/0075

Abstract: An imaging optical system includes sequentially from an object side a front group configured to include a positive lens disposed at a position nearest a diaphragm; the diaphragm; and a rear group configured to include a negative lens disposed at a position nearest the diaphragm. The imaging optical system satisfies a conditional expression (1) 0.27≦|θ3/θ2|≦1.80, where θ3 represents temperature-dependent variation of relative refractive index for d-line of the negative lens and θ2 represents temperature-dependent variation of relative refractive index for d-line of the positive lens.

Abstract translation: 成像光学系统从物体侧依次包括被配置为包括设置在最靠近光阑的位置处的正透镜的前组; 隔膜; 以及后组，被配置为包括设置在最靠近隔膜的位置处的负透镜。 成像光学系统满足条件表达式（1）0.27＆nlE; | | thetas; 3 /＆Thetas; 2 |＆nlE; 1.80，其中＆3;表示负透镜的d线相对折射率的温度相关变化和 ; 2表示正透镜的d线的相对折射率的温度依赖性变化。