| 发明名称 | Zoom lens, image pickup apparatus using the same, and information processing apparatus | ||
| 摘要 | A zoom lens includes in order from an object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power, and at the time of zooming, the first lens group is fixed, the second lens group moves, the third lens group moves, and the fourth lens group is fixed. The first lens group includes in order from the object side, a negative lens, a reflecting optical element, and a positive lens. The second lens group includes in order from the object side, an aperture stop, a positive lens, a cemented lens having a negative refractive power, and a positive lens. The cemented lens includes a positive lens and a negative lens. | ||
| 申请公布号 | US9291799(B2) | 申请公布日期 | 2016.03.22 |
| 申请号 | US201313789969 | 申请日期 | 2013.03.08 |
| 申请人 | OLYMPUS CORPORATION | 发明人 | Amanai Takahiro;Abe Kenichiro;Otsu Takuya;Fujikura Takashi |
| 分类号 | G02B15/14;G02B13/04;G02B15/177 | 主分类号 | G02B15/14 |
| 代理机构 | Brosemer, Kolefas & Assoc. LLC | 代理人 | Brosemer, Kolefas & Assoc. LLC |
| 主权项 | 1. A zoom lens comprising in order from an object side: a first lens group having a negative refractive power; a second lens group having a positive refractive power; a third lens group having a negative refractive power; and a fourth lens group having a positive refractive power, wherein: when zooming, the first lens group is fixed, the second lens group moves, the third lens group moves, and the fourth lens group is fixed,the first lens group comprises in order from the object side, a negative lens, a reflecting optical element, and a positive lens,the positive lens is a single lens, andan object-side surface of the positive lens and an image-side surface of the positive lens are in contact with air. | ||
| 地址 | Tokyo JP | ||