专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JP2012123412A Fisheye lens system and fisheye zoom lens system 有权
标题翻译： FISHEYE镜头系统和FISHEYE ZOOM镜头系统
公开(公告)号：JP2012123412A
公开(公告)日：2012-06-28
申请号：JP2012026180
申请日：2012-02-09
申请人： Pentax Ricoh Imaging Co Ltd , ペンタックスリコーイメージング株式会社
发明人： ITO TAKAYUKI , HIRAKAWA JUN
IPC分类号： G02B15/16
摘要： PROBLEM TO BE SOLVED: To provide a fisheye lens system and a fisheye zoom lens system for a digital camera, configured in a small size while having a back focus of about the same degree as that of a 35 mm film camera, and having favorably compensated various aberrations including chromatic aberration of magnification.SOLUTION: The fisheye zoom lens system includes in order from an object side, a first lens group of negative power and a second lens group of positive power which are divided at a position of the maximum air interval at a short focal length extremity, and the interval between the first lens group and the second lens group reduces during variation of magnification from the short focal length extremity to a long focal length extremity. In the fisheye zoom lens system, the first lens group has in order from an object side, a first negative meniscus lens convex on the object side, a second negative meniscus lens convex on the object side, and a third negative lens, and satisfies a conditional expression relating to the shaping factor of each of the negative lenses.
摘要翻译：要解决的问题：提供一种用于数码相机的鱼眼镜头系统和鱼眼变焦镜头系统，其配置为具有与35mm胶片相机大致相同程度的后焦距的小尺寸，以及有利地补偿了包括色像差的各种像差。解决方案：鱼眼变焦透镜系统包括从物体侧起的负功率的第一透镜组和正功率的第二透镜组，其在短焦距末端处的最大空气间隔的位置处被划分并且第一透镜组和第二透镜组之间的间隔在从短焦距末端到长焦距末端的放大变化期间减小。在鱼眼变焦透镜系统中，第一透镜组从物体侧起，物体侧凸起的第一负弯月形透镜，物体侧凸起的第二负弯月形透镜和第三负透镜，并且满足与每个负透镜的成形因子相关的条件表达式。版权所有（C）2012，JPO＆INPIT

IPRDB

热门服务

关于我们

友情链接

联系方式