| 发明名称 | Fixed-focus lens | ||
| 摘要 | A fixed-focus lens including a first lens group, a second lens group and an aperture stop is provided. The first lens group has a positive refractive power, and includes a first lens, a second lens and a third lens arranged in sequence from a magnified side to a reduced side. The second lens group has a positive refractive power, and includes a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from the magnified side to the reduced side. A product of a refractive power and a slope of a refractive index changing with a temperature change of any one lens of the second lens group is P×(dn/dt), and a sum of P×(dn/dt) of the lenses of the second lens group is less than 0. The aperture stop is disposed between the first lens group and the second lens group. | ||
| 申请公布号 | US9470874(B2) | 申请公布日期 | 2016.10.18 |
| 申请号 | US201514876824 | 申请日期 | 2015.10.07 |
| 申请人 | Coretronic Corporation | 发明人 | Kuo Tao-Hung;Lin Tzu-Yuan;Wei Ching-Chuan;Cheng Chuan-Te |
| 分类号 | G02B9/04;G02B9/60;G02B1/04;G02B13/18;G02B27/00;G02B13/04 | 主分类号 | G02B9/04 |
| 代理机构 | Jianq Chyun IP Office | 代理人 | Jianq Chyun IP Office |
| 主权项 | 1. A fixed-focus lens, comprising: a first lens group having a positive refractive power, and including a first lens, a second lens and a third lens arranged in sequence from a magnified side to a reduced side; a second lens group having a positive refractive power, and including a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from the magnified side to the reduced side, wherein a product of a refractive power and a slope of a refractive index changing with a temperature change of any one lens of the second lens group is P×(dn/dt), and a sum of P×(dn/dt) of the lenses of the second lens group is less than 0; and an aperture stop, disposed between the first lens group and the second lens group. | ||
| 地址 | Hsin-Chu TW | ||