| 发明名称 |
Apochromatic optical design |
| 摘要 |
An apochromatic imaging system has an object-side lens group having at least an object-side lens element with positive refractive power and formed from a flint glass material with deviation of relative dispersion −0.013<ΔPg,F<+0.013 and an Abbe number less than 50. A middle lens group has at least a second lens element and a third lens element, wherein, one of the second and third lens elements has deviation of relative dispersion −0.013<ΔPg,F<0.013 and the other of the second and third lens elements has deviation of relative dispersion 0.013<ΔPg,F<0.04. An image-side lens group has at least a fourth lens element. |
| 申请公布号 |
US9588331(B2) |
申请公布日期 |
2017.03.07 |
| 申请号 |
US201414548329 |
申请日期 |
2014.11.20 |
| 申请人 |
Bietry Joseph R. |
发明人 |
Bietry Joseph R. |
| 分类号 |
G02B23/00;G02B27/00;G02B9/34 |
主分类号 |
G02B23/00 |
| 代理机构 |
|
代理人 |
Horvath Louis S. |
| 主权项 |
1. An apochromatic imaging system comprising:
a) an object-side lens group having at least an object-side lens element that lies nearest the object with positive refractive power and formed from a flint glass material with deviation of relative dispersion −0.013<ΔPg,F<+0.013 and an Abbe number less than 50; b) a middle lens group comprising at least a second lens element and a third lens element, wherein, one of the second and third lens elements has deviation of relative dispersion −0.013<ΔPg,F<0.013 and the other of the second and third lens elements has deviation of relative dispersion 0.013<ΔPg,F<0.04; and c) an image-side lens group having at least a fourth lens element. |
| 地址 |
Rochester NY US |
