公开(公告)号：US5572277A

公开(公告)日：1996-11-05

申请号：US258925

申请日：1994-06-13

申请人： Tsutomu Uzawa ,  Naoki Fujii ,  Atsujiro Ishii

发明人： Tsutomu Uzawa ,  Naoki Fujii ,  Atsujiro Ishii

IPC分类号： G02B13/18 ,  G02B15/173 ,  G02B15/20 ,  G02B15/14

CPC分类号： G02B15/173

摘要： The invention provides a zoom lens system having a zoom ratio as high as about 8 to 12 but is of wide field angle and small size, and is suitable for use on a video camera, said zoom lens system comprising a positive first lens unit L1 which is movable in an orbit, said orbit displaceable toward objet side at the telephoto end position rather than at the wide-angle end position, a negative second lens unit L2 which is movable in an orbit, said orbit displaceable toward the image side at the telephoto end position rather than at the wide-angle end position, a positive third lens unit L3 which is movable in an orbit, said orbit displaceable toward the object side at the telephoto end position rather than at the wide-angle end, and a positive or negative fourth lens unit L4 which is movable, and conforming to2.6

摘要翻译： 本发明提供一种变焦透镜系统，其具有高达约8至12的变焦比，但具有宽的视野角和小的尺寸，并且适用于摄像机，所述变焦透镜系统包括正的第一透镜单元L1， 可在轨道上移动，所述轨道在望远端位置而不是在广角端位置朝向瞄准侧移位，可在轨道上移动的负第二透镜单元L2，所述轨道在望远位置朝向像侧移位 在广角端位置，而不是在广角端位置，可以在轨道上移动的正的第三透镜单元L3，所述轨道在望远端位置而不是在广角端处朝物体侧移位，而正的或 负第四透镜单元L4，其可移动，并且符合2.6

公开(公告)号：US5418646A

公开(公告)日：1995-05-23

申请号：US98821

申请日：1993-07-29

申请人： Hironori Shibata ,  Atsujiro Ishii

发明人： Hironori Shibata ,  Atsujiro Ishii

IPC分类号： G02B15/173 ,  G02B15/14 ,  G02B13/18

CPC分类号： G02B15/173

摘要： A zoom lens system comprising, in order from the object side, a first lens unit which has a positive refractive power and is kept fixed during zooming, a second lens unit which has a negative refractive power, is movable for zooming and has a vari-focal function, a third lens unit which has a positive refractive power and is movable for zooming, and a fourth lens unit which has a positive refractive power and is movable for zooming; a location of the third lens unit at a tele position of the zoom lens system being on the object side of a location of the third lens unit at a wide position of the zoom lens system. This zoom lens system consists of a small number of lens components, and has a vari-focal ratio of 9 to 12 and a wide field angle of 65.degree. to 68.degree. at the wide position thereof.

摘要翻译： 一种变焦透镜系统，其从物体侧依次包括具有正折光力并在变焦期间保持固定的第一透镜单元，具有负折光力的第二透镜单元可移动以进行变焦， 焦点功能，具有正折射能力并且可变焦的第三透镜单元和具有正折光力并可移动以进行变焦的第四透镜单元; 在变焦透镜系统的远摄位置处的第三透镜单元的位置在第三透镜单元的位置的物体侧处于变焦透镜系统的宽位置。 该变焦透镜系统由少量的透镜部件组成，并且在其宽的位置具有9至12的变焦比和65°至68°的宽视场角。

公开(公告)号：US4976521A

公开(公告)日：1990-12-11

申请号：US395806

申请日：1989-08-18

申请人： Atsujiro Ishii ,  Tsutomu Uzawa

发明人： Atsujiro Ishii ,  Tsutomu Uzawa

IPC分类号： G02B9/00 ,  G02B15/16 ,  G02B15/177

CPC分类号： G02B15/177

摘要： A zoom lens system comprising a first lens unit having negative refractive power and a second lens unit having positive refractive power, so adapted as to change focal length thereof by varying the airspace reserved between said first lens unit and said second lens unit, and using at least one radial GRIN lens in said first lens unit. Said zoom lens system comprises a very small number of lens elements, and has distortion and chromatic aberration corrected especially favorably.

摘要翻译： 一种变焦透镜系统，包括具有负折光力的第一透镜单元和具有正折光力的第二透镜单元，适于通过改变在所述第一透镜单元和所述第二透镜单元之间预留的空气空间来改变其焦距，并且在 所述第一透镜单元中的至少一个径向GRIN透镜。 所述变焦透镜系统包括非常少数量的透镜元件，并且特别有利地校正了失真和色差。

公开(公告)号：US4973143A

公开(公告)日：1990-11-27

申请号：US428061

申请日：1989-10-27

申请人： Atsujiro Ishii ,  Shinichi Mihara

发明人： Atsujiro Ishii ,  Shinichi Mihara

IPC分类号： G02B13/18 ,  G02B15/16 ,  G02B15/177

CPC分类号： G02B15/177

摘要： A zoom lens system having a wide field angle, a long back focal length, a high zooming ratio, and comprising a small number of lens elements. Said zoom lens system comprises, in the order from the object side, a front lens unit having negative refractive power and a rear lens unit having positive refractive power, and is so adapted as to perform variation of focal length, said front lens unit consisting of a negative meniscus lens element having a convex surface on the object side, a negative lens element and a positive lens element, whereas said rear lens unit comprising, on the extremely image side therein, a positive lens component consisting of a positive lens element having a short radius of curvature on the image side surface thereof and a positive lens element having a short radius of curvature on the object side surface thereof.

摘要翻译： 一种变焦透镜系统，其具有宽视场角，长后焦距，高变焦比，并且包括少量透镜元件。 所述变焦透镜系统按照物体侧的顺序包括具有负折光力的前透镜单元和具有正折光力的后透镜单元，并且适于执行焦距的变化，所述前透镜单元由 在物体侧具有凸面的负弯月形透镜元件，负透镜元件和正透镜元件，而所述后透镜单元在其极像上包括由正透镜元件组成的正透镜元件，所述正透镜元件具有 在其像侧表面上具有短曲率半径和在其物体侧表面上具有短曲率半径的正透镜元件。