公开(公告)号：US4340279A

公开(公告)日：1982-07-20

申请号：US109172

申请日：1980-01-02

申请人： Keiji Ikemori

发明人： Keiji Ikemori

IPC分类号： G02B9/62 ,  G02B9/60 ,  G02B15/10 ,  G02B15/12 ,  G02B15/02

CPC分类号： G02B9/60 ,  G02B15/10

摘要： In order to increase the focal length of a master lens, a lens of negative power is attached at the rear end of the master lens. This rear attachment lens comprises three lens groups of which the first, counting from the front, is of positive power and consists of a negative meniscus lens of forward convexity and a biconvex lens with the confronting surfaces of these lenses forming a divergent air lens. The second lens group is of negative power, and has at least two pairs of divergent cemented surfaces of opposite curvature particularly for the purpose of achieving improvement of the Petzval sum and good correction of astigmatism simultaneously. The third lens group is of positive power and consists of a positive lens and a negative lens.

摘要翻译： 为了增加主镜头的焦距，在主镜片的后端安装有负像的透镜。 该后附加透镜包括三个透镜组，其中第一透镜组从前面计数为正光焦度，并且由前凸的负弯月形透镜和双凸透镜组成，其中这些透镜的相对表面形成发散空气透镜。 第二透镜组具有负功率，并且具有相对曲率的至少两对发散的粘结表面，特别是为了同时实现Petzval和的改善和散光的良好校正。 第三透镜组具有正功率，由正透镜和负透镜组成。

公开(公告)号：US4310222A

公开(公告)日：1982-01-12

申请号：US031613

申请日：1979-04-18

申请人： Keiji Ikemori

发明人： Keiji Ikemori

IPC分类号： G02B13/04 ,  G02B13/18 ,  G02B9/64

CPC分类号： G02B13/04 ,  G02B13/18

摘要： The present invention relates to a retro-focus type wide angle lens which is compact despite its remarkably large field of view and well compensated for various aberrations.This lens system consists of the first divergent lens group and the second convergent lens group in sequence from the side of the object, whereby the first divergent group consists of a plural number of meniscus lenses convex to the object in such a manner that the distortion is compensated for and a compact lens system is realized by forming the object side surface of the substantially zero first order power lens in the meniscus lenses non spherical. The meniscus lens with non-spherical surface is formed from plastic material, resulting in an inexpensive and light retro-focus type wide angle lens.Further, the second convergent lens group is divided into two lens groups with a diaphragm as boundary, whereby in the object side lens group a meniscus lens concave to the object and a biconvex lens are arranged in sequence from the diaphragm to the object side so as to form an air lens having a divergent effect between both lenses, while in the image plane side lens group a lens concave to the image is arranged so as to eliminate the astigmatism and the spherical aberration.

摘要翻译： 本发明涉及一种即使具有非常大的视场和很好补偿各种像差的复焦型广角镜。 该透镜系统由物体侧面的第一发散透镜组和第二会聚透镜组构成，由此第一发散组由对象物凸起的多个弯月透镜构成，使得失真为 通过在弯月形透镜中形成基本为零的一次光焦度透镜的物体侧表面非球面来实现紧凑的透镜系统。 具有非球形表面的弯液面透镜由塑料材料形成，从而形成廉价且重量轻的复焦型广角镜头。 此外，第二会聚透镜组被分成具有隔膜作为边界的两个透镜组，由此在物体侧透镜组中，从光阑到物体侧依次布置对物体凹陷的弯月形透镜和双凸透镜，以便 以形成在两个透镜之间具有发散效应的空气透镜，而在像面侧透镜组中，对图像凹入的透镜被布置以消除散光和球面像差。

公开(公告)号：US4110006A

公开(公告)日：1978-08-29

申请号：US773667

申请日：1977-03-02

申请人： Keiji Ikemori

发明人： Keiji Ikemori

IPC分类号： G02B15/167 ,  G02B15/173 ,  G02B15/22 ,  G02B15/18

CPC分类号： G02B15/173

摘要： The present invention relates to a focusing lens group of a telephoto zoom lens having a long range of focal length. The focusing lens group consists of four sub-groups, wherein first, second, and fourth sub-groups are fixed while a third sub-group can be shifted for focusing. And the first sub-group has a positive refractive power and the second sub-group has a negative refractive power. The third sub-group has a positive refractive power and the fourth sub-group has a negative refractive power. As a result, the variation in the image quality at a time when the telephoto zoom lens is focused will be eliminated and the diameters of the lenses in the second, third and fourth sub-groups will be smaller than that of the first sub-group.

摘要翻译： 本发明涉及长距离焦距的长焦变焦镜头的聚焦透镜组。 聚焦透镜组由四个子组组成，其中第一，第二和第四子组是固定的，而第三子组可以移动以进行聚焦。