公开(公告)号：US08786957B2

公开(公告)日：2014-07-22

申请号：US13531695

申请日：2012-06-25

申请人： Yotaro Sanjo ,  Shinichiro Yakita

发明人： Yotaro Sanjo ,  Shinichiro Yakita

IPC分类号： G02B15/14

CPC分类号： G02B15/14 ,  G02B7/008 ,  G02B15/173 ,  G02B27/0062

摘要： A zoom lens includes, in order from an object side, a positive first lens unit which does not move for zooming, a negative second lens unit which moves in an optical axis direction for zooming, a negative third lens unit which moves in the optical axis direction for zooming so as to correct image plane variation due to zooming, and a positive fourth lens unit which does not move for zooming. The fourth lens unit includes, in an order from the object side, a positive first sub lens unit and a positive second sub lens unit, which are separated by a largest air interval in the fourth lens unit. Abbe constants, partial dispersion ratios, and coefficients of the refractive index variation due to the temperature variation are appropriately set for lens materials forming the third lens unit, the first sub lens unit, and the second sub lens unit.

摘要翻译： 变焦透镜从物体的顺序依次包括不能进行变焦的正的第一透镜单元，沿光轴方向移动的负的第二透镜单元进行变焦，在光轴上移动的负的第三透镜单元 用于缩放的方向以校正由于变焦引起的图像平面变化，以及不能移动用于变焦的正的第四透镜单元。 第四透镜单元从物体侧依次包括在第四透镜单元中以最大空气间隔分开的正的第一子透镜单元和正的第二子透镜单元。 对于形成第三透镜单元，第一子透镜单元和第二子透镜单元的透镜材料，适当地设定由于温度变化引起的折射率变化的阿贝常数，部分色散比和系数。

公开(公告)号：US08570660B2

公开(公告)日：2013-10-29

申请号：US13567860

申请日：2012-08-06

申请人： Shoichi Takemoto ,  Masao Hori ,  Kazuya Shimomura ,  Yotaro Sanjo

发明人： Shoichi Takemoto ,  Masao Hori ,  Kazuya Shimomura ,  Yotaro Sanjo

IPC分类号： G02B15/06 ,  G02B15/02

CPC分类号： G02B15/177 ,  G02B15/10

摘要： A wide-angle converter lens capable of being detachably mounted on an enlargement side of an imaging lens includes a first optical element, at least one optical element having negative refractive power, and at least one optical element having positive refractive power, wherein, when an average value of relative partial dispersions of the first optical element and all optical elements of which the sign of refractive power is the same as that of the first optical element is denoted by θgF_ave, a relative partial dispersion of the first optical element is denoted by θgF, and an Abbe number of the first optical element is denoted by νd, these numerical values satisfy appropriate relationships.

摘要翻译： 能够可拆卸地安装在成像透镜的放大侧的广角转换器透镜包括第一光学元件，至少一个具有负屈光力的光学元件和至少一个具有正折光力的光学元件，其中，当 第一光学元件的相对部分色散的平均值和折射力的符号与第一光学元件的相同的所有光学元件由tagF_ave表示，第一光学元件的相对部分色散由tagF表示 ，并且第一光学元件的阿贝数由nud表示，这些数值满足适当的关系。

公开(公告)号：US20130038945A1

公开(公告)日：2013-02-14

申请号：US13567860

申请日：2012-08-06

申请人： Shoichi Takemoto ,  Masao Hori ,  Kazuya Shimomura ,  Yotaro Sanjo

发明人： Shoichi Takemoto ,  Masao Hori ,  Kazuya Shimomura ,  Yotaro Sanjo

IPC分类号： G02B15/02

CPC分类号： G02B15/177 ,  G02B15/10

摘要： A wide-angle converter lens capable of being detachably mounted on an enlargement side of an imaging lens includes a first optical element, at least one optical element having negative refractive power, and at least one optical element having positive refractive power, wherein, when an average value of relative partial dispersions of the first optical element and all optical elements of which the sign of refractive power is the same as that of the first optical element is denoted by θgF_ave, a relative partial dispersion of the first optical element is denoted by θgF, and an Abbe number of the first optical element is denoted by νd, these numerical values satisfy appropriate relationships.

摘要翻译： 能够可拆卸地安装在成像透镜的放大侧的广角转换器透镜包括第一光学元件，至少一个具有负屈光力的光学元件和至少一个具有正折光力的光学元件，其中，当 第一光学元件的相对部分色散的平均值以及折射力的符号与第一光学元件的相同的所有光学元件的平均值表示为第一光学元件的第一光学元件的相对部分色散 第一光学元件的阿贝数由＆ngr; d表示，这些数值满足适当的关系。