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31. 发明授权

US06671099B2 Image-forming optical system 有权
公开(公告)号：US06671099B2
公开(公告)日：2003-12-30
申请号：US10025896
申请日：2001-12-26
申请人： Tetsuo Nagata
发明人： Tetsuo Nagata
IPC分类号： G02B2714
CPC分类号： G02B17/086 , G02B13/0015 , G02B13/005 , G02B13/006 , G02B13/0065 , G02B13/007 , G02B17/0832 , G02B17/0848
摘要： A high-performance and low-cost image-forming optical system has a reduced number of constituent optical elements and is made extremely thin, particularly in a direction perpendicular to an image pickup device, by folding an optical path using only three reflecting surfaces. The image-forming optical system has a front unit including a first prism 10, an aperture stop 2, and a rear unit including a second prism 20. The first prism 10 has a first transmitting surface 11, a first reflecting surface 12, and a second transmitting surface 13. The second prism 20 has a first transmitting surface 21, a first reflecting surface 22, a second reflecting surface 23, and a second transmitting surface 24. An optical path incident on the first reflecting surface 22 and an optical path exiting from the second reflecting surface 23 intersect each other. The first reflecting surface 12 of the first prism 10 and the first and second reflecting surfaces 22 and 23 of the second prism 20 have a curved surface configuration that gives a power to a light beam. The curved surface configuration is a rotationally asymmetric surface configuration that corrects aberrations due to decentration.

32. 发明授权

US5978158A Phototaking lens system 失效
标题翻译：摄影镜头系统
公开(公告)号：US5978158A
公开(公告)日：1999-11-02
申请号：US949148
申请日：1997-10-10
申请人： Tetsuo Nagata
发明人： Tetsuo Nagata
IPC分类号： G02B13/04 , G02B5/18 , G02B13/18
CPC分类号： G02B5/1814
摘要： The invention provides an inexpensive phototaking lens system comprising a reduced number of lenses, which makes use of a diffractive optical element to make correction for first-order longitudinal chromatic aberration and chromatic aberration of magnification, and eliminates higher-order chromatic aberrations of magnification produced in a wide-angle lens system. The phototaking lens system comprises a front group having negative power, an aperture stop and a rear group having positive power, with the rear group comprising at least one positive lens and a diffractive optical element having a diffractive surface D of positive power, and satisfies conditions for making good correction for chromatic aberrations produced at a refractive system with the diffractive optical element and conditions for making well-balanced correction for longitudinal chromatic aberration and chromatic aberration of magnification.
摘要翻译：本发明提供了一种廉价的摄影透镜系统，其包括减少数量的透镜，其利用衍射光学元件对一阶纵向色像差和倍率色像差进行校正，并且消除了倍数产生的高阶色差广角镜头系统。摄像透镜系统包括具有负功率的前组，具有正功率的孔径光阑和后组，后组包括至少一个正透镜和具有正光焦度的衍射面D的衍射光学元件，并且满足条件用于对具有衍射光学元件的折射系统产生的色差进行良好校正，以及用于对纵向色像差和倍率色像差进行良好平衡校正的条件。

33. 发明授权

US5923479A Wide-angle lens system 失效
标题翻译：广角镜头系统
公开(公告)号：US5923479A
公开(公告)日：1999-07-13
申请号：US70155
申请日：1998-04-30
申请人： Tetsuo Nagata
发明人： Tetsuo Nagata
IPC分类号： G02B13/04 , G02B13/18 , G02B27/00 , G02B9/00 , G02B9/04 , G02B9/62
CPC分类号： G02B27/4211 , G02B13/04 , G02B27/0037 , G02B27/4216
摘要： The invention provides an inexpensive wide-angle lens system which is well corrected for longitudinal chromatic aberration and chromatic aberration of magnification without recourse to any anomalous dispersion glass while a long enough back focus is fully ensured. The wide-angle lens system comprises a front lens group comprising at least one positive lens and having negative power as a whole, an aperture stop 10, and a rear lens group comprising at least one negative lens and a diffractive optical element 11 having a diffractive surface of positive power, and having positive power as a whole, and satisfies 0.005
摘要翻译：本发明提供了一种便宜的广角镜头系统，该系统对于纵向色像差和色像差而进行了良好的校正，而不需要任何异常色散玻璃，同时充分确保足够长的后焦距。广角镜头系统包括一个包括至少一个正透镜并且整体具有负功率的前透镜组，孔径光阑10和包括至少一个负透镜的后透镜组和具有衍射的衍射光学元件11 正功率的表面，并且具有整体的正电力，并且满足0.005

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