| 发明名称 | Endoscope optical system | ||
| 摘要 | An endoscope optical system has a first lens group having positive refractive power, an aperture diaphragm, a second lens group having negative refractive power and a third lens group having positive refractive group, the second lens group moving along an optical axis to perform focusing, the first lens group having a first lens having negative refractive power and a second lens having positive refractive power, and the optical system satisfying the following conditional equation: −5.0<H(76)*(1−nd01)/r2<−0.2 (1)0.5<(r1+r2)/(r1−r2)<1.2 (2)where H(76) is a height at which a principal ray having an incidence angle of view of 76 degrees during normal observation passes through a surface on an image side of the first lens, nd01 is a refractive index of the first lens with respect to a line d, and r1 and r2 are respectively curvature radii of surfaces on the object side and the image side of the first lens. | ||
| 申请公布号 | US9110302(B2) | 申请公布日期 | 2015.08.18 |
| 申请号 | US201414505957 | 申请日期 | 2014.10.03 |
| 申请人 | OLYMPUS MEDICAL SYSTEMS CORP. | 发明人 | Katakura Masahiro |
| 分类号 | G02B23/24;G02B9/14;G02B13/00;A61B1/00 | 主分类号 | G02B23/24 |
| 代理机构 | Kenyon & Kenyon LLP | 代理人 | Kenyon & Kenyon LLP |
| 主权项 | 1. An endoscope optical system consisting of a first lens group having positive refractive power, an aperture diaphragm, a second lens group having negative refractive power, and a third lens group having positive refractive power, in this order from an object side to an image side, the second lens group moving along an optical axis to perform focusing, and the first lens group comprising a first lens having negative refractive power and a second lens having positive refractive power, in this order from the object side and satisfying the following conditional equations: −5.0<H(76)*(1−nd01)/r2<−0.2 (1)0.5<(r1+r2)/(r1−r2)<1.2 (2) where H(76) is a height at which a principal ray of an incidence angle of view of 76 degrees during normal observation transmits through a surface on the image side of the first lens, nd01 is a refractive index of the first lens with respect to a line d, and r1 and r2 are respectively curvature radii of a surface on the object side and the surface on the image side of the first lens. | ||
| 地址 | Tokyo JP | ||