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    • 52. 发明授权
    • Wide angle copying lens system
    • 广角复印镜头系统
    • US4690518A
    • 1987-09-01
    • US839044
    • 1986-03-12
    • Taira KouchiwaKiichiro Nishina
    • Taira KouchiwaKiichiro Nishina
    • G02B9/62G02B13/24
    • G02B9/62G02B13/24
    • This invention relates to a completely symmetrical wide angle copying lens system for a compact copying machine using a high output lamp. A topogon type wide angle lens system which is easy in correction of a radial curvature of field is basically used, and positive meniscus lenses having a small refracting power with a convex surface directed toward a diaphragm are symmetrically arranged with the diaphragm placed therebetween. A copying lens system is provided in which the tangential curvature of field and a deviation of the field cased by color are corrected by the construction as described above, the overall length of the lens system is shortened and even if a copying magnification is changed in the range of from .times.0.5 to .times.2.0, the performance is not deteriorated.
    • 本发明涉及一种用于使用高输出灯的小型复印机的完全对称的广角复印透镜系统。 基本上使用容易校正径向曲率的拓角型广角透镜系统,具有朝向光阑的凸面的具有小的折射力的正弯月形透镜对称地设置有隔膜。 提供了一种复制透镜系统,其中通过如上所述的结构来校正切向曲率和由颜色包围的场的偏差,所以透镜系统的总长度被缩短,并且即使在 范围从x0.5到x2.0,性能没有恶化。
    • 60. 发明申请
    • Original reading lens, original reading lens unit, original reading device, and image forming device
    • 原始阅读镜头,原装阅读镜头单元,原装阅读装置及图像形成装置
    • US20050141103A1
    • 2005-06-30
    • US10971160
    • 2004-10-25
    • Kiichiro Nishina
    • Kiichiro Nishina
    • G02B13/24G02B9/36G02B9/60G02B13/16G02B13/18H04N1/028G02B3/02
    • G02B9/60G02B9/36G02B13/16
    • An original reading lens includes a four-group, five-element lens configuration including three positive lenses and two negative lenses, wherein the positive lens is constructed by a glass material of low dispersion, and the negative lens is constructed by a glass material of high dispersion, a partial dispersion θ gd is defined by θ gd=(ng−nd)/(nF−nc) by a refractive index nd of d line (587.56 nm), a refractive index nc of c line (656.27 nm), a refractive index nF of F line (486.13 nm), and a refractive index ng of g line (435.83 nm), a straight line connecting a coordinate point of a reference glass material K7, K7 (θ gd, ν d) and a coordinate point of a reference glass material F2, F2 (θ gd, ν d) on a plane with a coordinate system including the partial dispersion θ gd and an Abbe number ν d as orthogonal two axes is adopted as a reference line, and a partial dispersion deviation δ θ gd which is the deviation from the reference line of the partial dispersion θ gd of the material is positive in one or more positive lens.
    • 原始读取镜头包括四组五元件透镜配置,包括三个正透镜和两个负透镜,其中正透镜由低色散的玻璃材料构成,负透镜由高玻璃材料构成 分散,部分色散θgd由d线(587.56nm)的折射率nd,c线的折射率nc(656.27nm),θgd =(ng-nd)/(nF-nc) F线(486.13nm)的折射率nF和g线(435.83nm)的折射率ng,连接参考玻璃材料K 7,K 7(θgd,nu d)的坐标点和 采用坐标系的参考玻璃材料F 2,F 2(θgd,nu d)在具有包括部分色散theta gd和阿贝数nu d作为正交两轴的坐标系的坐标点作为参考线,并且 偏离偏离参考线的部分色散偏差delta theta gd 在一个或多个正透镜中,材料的色散theta gd为正。