公开(公告)号：US5040884A

公开(公告)日：1991-08-20

申请号：US560568

申请日：1990-07-31

申请人： Yuichiro Kanoshima

发明人： Yuichiro Kanoshima

IPC分类号： G02B9/52 ,  G02B13/00 ,  G02B26/10

CPC分类号： G02B9/52 ,  G02B13/00 ,  G02B26/10

摘要： A reading lens system for a scanner is used at a reduced magnification so as to read an original image at a high speed, and comprises, successively in order from an object toward an image, a first lens unit to a fifth lens unit and an aperture disposed between the second lens unit and the third lens unit. The first lens unit comprises a positive lens serving as a first lens and a negative lens serving as a second lens and being cemented on an image side of the first lens. The second lens unit comprises a meniscus lens serving as a third lens, of which convex surface faces the object. The third lens unit comprises a meniscus lens serving as a fourth lens, of which convex surface faces an image. The fourth lens unit comprises a biconcave lens serving as a fifth lens and a biconvex lens serving as sixth lens and being cemented on the image side of the fifth lens. The fifth lens unit comprises a plane-parallel glass plate serving as a seventh lens. The lens system has the ratio f/f.sub.12 within the predetermined range where f is the focal length of the entire lens system, and f.sub.12 is the focal length of the first lens unit.

摘要翻译： 用于扫描仪的读取透镜系统以缩小的倍率被使用，以便以高速读取原始图像，并且从对象到图像依次包括第一透镜单元到第五透镜单元和孔 设置在第二透镜单元和第三透镜单元之间。 第一透镜单元包括用作第一透镜的正透镜和用作第二透镜的负透镜，并且胶合在第一透镜的像侧。 第二透镜单元包括用作第三透镜的弯月形透镜，其凸面面向物体。 第三透镜单元包括用作第四透镜的凹凸透镜，其凸面面对图像。 第四透镜单元包括用作第五透镜的双凹透镜和用作第六透镜的双凸透镜，并且胶合在第五透镜的像侧。 第五透镜单元包括用作第七透镜的平面平行玻璃板。 透镜系统的f / f12比率在预定范围内，其中f是整个透镜系统的焦距，f12是第一透镜单元的焦距。

公开(公告)号：US5039212A

公开(公告)日：1991-08-13

申请号：US522114

申请日：1990-05-11

申请人： Yuichiro Kanoshima

发明人： Yuichiro Kanoshima

IPC分类号： G03G15/041 ,  G02B13/24 ,  G02B15/14 ,  G02B15/177

CPC分类号： G02B15/177

摘要： A zoom lens for a variable magnification copying machine has a first lens composed of a concave lens; a second lens composed of a convex lens; a third lens composed of a meniscus concave lens and having a concave face on an object side; a diaphragm; a fourth lens composed of the same lens as the third lens and having a concave face on an image face side; a fifth lens composed of the same convex lens as the second lens; a sixth lens composed of the same concave lens as the first lens; the first to sixth group lenses being sequentially arranged from an object face toward the image face; the first to sixth lenses being symmetrically arranged around the diaphragm when the object is formed as an image on the image face at equal magnification; and a device for symmetrically moving at least the first and sixth lenses among the first to sixth lenses and the diaphragm and moving the entire lens system in the direction of an optical axis when the object is formed by changing the magnification as an image on the image face so as to continuously change the magnification while a conjugate length from the object face to the image face is constantly held at the times of equal and variable magnifications.

摘要翻译： 用于可变倍率复印机的变焦透镜具有由凹透镜构成的第一透镜; 由凸透镜构成的第二透镜; 由弯液面凹透镜构成的第三透镜，在物体侧具有凹面; 隔膜 由与第三透镜相同的透镜构成的第四透镜，并且在图像面侧具有凹面; 由与第二透镜相同的凸透镜构成的第五透镜; 由与第一透镜相同的凹透镜组成的第六透镜; 第一组至第六组透镜从物体面朝向图像面依次布置; 当物体以相等的倍率形成为图像上的图像时，第一至第六透镜对称地布置在隔膜周围; 以及用于在第一至第六透镜和光阑中至少对称地移动第一透镜和第六透镜的装置，并且当通过将图像作为图像上的图像改变来形成物体时，使整个透镜系统在光轴方向上移动 从而在从对象面到图像面的共轭长度恒定地保持在相等和可变放大倍率的时候，连续地改变放大率。