公开(公告)号：US4449793A

公开(公告)日：1984-05-22

申请号：US288286

申请日：1981-07-30

申请人： Akiyoshi Nakamura ,  Hisashi Tokumaru

发明人： Akiyoshi Nakamura ,  Hisashi Tokumaru

IPC分类号： G02B13/04

CPC分类号： G02B13/06

摘要： An inverted telephoto type wide angle lens system is provided. The lens system comprises an aperture stop, a first lens group located at the object side of the aperture stop, and a second lens group located at the image side of the aperture stop, the second lens group including at least two movable focusing lens groups, whereby the focusing is practiced by only the movement of the focusing lens groups with the remaining lens elements in the lens system stationary.

摘要翻译： 提供了一种倒置长焦型广角镜头系统。 透镜系统包括孔径光阑，位于孔径光阑的物体侧的第一透镜组和位于孔径光阑的像侧的第二透镜组，第二透镜组包括至少两个可移动聚焦透镜组， 由此仅通过聚焦透镜组与透镜系统中剩余的透镜元件的移动来固定聚焦。

公开(公告)号：US4258985A

公开(公告)日：1981-03-31

申请号：US45433

申请日：1979-06-04

申请人： Akiyoshi Nakamura

发明人： Akiyoshi Nakamura

IPC分类号： G02B13/04

CPC分类号： G02B13/04

摘要： The inverted telephoto type wide angle lens system of the present invention includes, from the object to image side, a first lens group having a positive single lens, a first negative meniscus single lens convex to the object side and a second negative meniscus single lens convex to the object side. A second lens group includes at least one positive lens while a third lens group includes, from the object to the image side, a first positive meniscus single lens convex to the image side, a biconcave single lens, a second positive single lens convex to the image side and a positive single lens. In addition, the inverted telephoto type wide angle lens system of the present invention fulfills the following conditions:______________________________________ 0.75f

摘要翻译： 本发明的倒置长焦型广角镜头系统包括从物体到像侧，具有正单透镜的第一透镜组，物体侧凸起的第一负弯液面单透镜和第二负弯液面单透镜凸面 到物体侧。 第二透镜组包括至少一个正透镜，而第三透镜组包括从物体到像侧，朝向像侧凸起的第一正弯月面单透镜，双凹面单透镜，第二透镜组凸出的第二正单透镜 图像侧和正单透镜。 此外，本发明的倒置长焦型广角镜头系统满足以下条件：-0.75f <| f1,2,3| <1.25f f1,2,3 <0 -10f

公开(公告)号：US4214814A

公开(公告)日：1980-07-29

申请号：US884357

申请日：1978-03-07

申请人： Shuji Ogino ,  Toshinobu Ogura ,  Yukio Okano ,  Akiyoshi Nakamura

发明人： Shuji Ogino ,  Toshinobu Ogura ,  Yukio Okano ,  Akiyoshi Nakamura

IPC分类号： G02B9/60 ,  G02B9/64 ,  G02B13/20

CPC分类号： G02B13/20

摘要： A variable soft focus lens system particularly adapted for photography is disclosed. The lens system incorporates two lens groups, a first object side lens group having an image side, rearmost surface convex to the image side, and a second, image side lens group having an object side, foremost surface concave to the object side. An airspace separating the first and second lens group has a meniscus shape concave to the object side. A good quality soft tone image having undersirable aberrations well within tolerable limits, is attained by shifting at least the second lens group along the optical axis relative to the first lens group whereby the airspace separating the two lens groups and a spherical aberration of the entire lens system is varied. An image does not lose proper focus while the spherical aberration of the system is varied. The second lens group has a refractive power within specified limits in relation to the refractive power of the entire lens system.

摘要翻译： 公开了一种特别适用于摄影的可变柔焦镜头系统。 透镜系统包括两个透镜组，具有图像侧的第一物体侧透镜组，朝向像侧凸起的最后表面，以及具有物体侧的第二镜像侧透镜组，最前端面朝向物体侧凹陷。 分离第一透镜组和第二透镜组的空间具有朝向物体侧凹入的弯月形状。 通过使第二透镜组相对于第一透镜组沿着光轴移动至少使第二透镜组分离两个透镜组的空间和整个透镜的球面像差，可获得具有良好的可容忍极限内的不良像差的良好质量的柔和色调图像 系统是多样的。 当系统的球面像差变化时，图像不会失去适当的对焦。 第二透镜组的折射力相对于整个透镜系统的屈光力具有特定的限制。

公开(公告)号：US3973832A

公开(公告)日：1976-08-10

申请号：US436763

申请日：1974-01-25

申请人： Toshinobu Ogura ,  Akiyoshi Nakamura

发明人： Toshinobu Ogura ,  Akiyoshi Nakamura

IPC分类号： G02B9/64 ,  G02B13/00 ,  G02B13/04 ,  G02B9/62

CPC分类号： G02B13/04 ,  G02B13/00

摘要： A retro-focus type wide angle lens system comprises a negative first component located on the object side and including at least one negative meniscus lens; a positive intermediate second component consisting of one or two lens groups including at least one biconvex lens group and a rear third component which includes of four consecutive lenses including, in order, a positive meniscus first lens having a rear convex surface, a biconcave second lens, a positive meniscus third lens having a rear convex surface and a fourth positive lens; whereby the back focus of the total lens system is longer than the focal length, and satisfying the following conditions:(1)d.sub.c0 > d.sub.c2(2).vertline.r.sub.c2 .vertline..gtoreq. .vertline. r.sub.c3 .vertline.(3)V.sub.c1 > V.sub.c2(4)d.sub.c0 > d.sub.c4whereinr.sub.c2 and r.sub.c3 are the radius of curvature of the rear surface of the first lens of the third component and the radius of curvature of the front surface of the second lens of the third component, respectively; d.sub.c0 is the axial distance between the rear lens of the second component and the first lens of the third component; d.sub.c2 and d.sub.c4 are the axial distance between the first and second lenses of the third component and the axial distance between the second lens and the third lens; andV.sub.c1 and V.sub.c2 are Abbe's Numbers of the first and second lenses of the third component.

摘要翻译： 复焦型广角镜头系统包括位于物体侧并且包括至少一个负弯月形透镜的负第一部件; 由包括至少一个双凸透镜组的一个或两个透镜组和包括四个连续透镜的后部第三部件组成的正中间第二部件依次包括具有后凸表面的正弯月面第一透镜，双凹面第二透镜 具有后凸表面的正弯月面第三透镜和第四正透镜; 由此，全透镜系统的后焦距比焦距长，满足以下条件：