(EN) This variable-focal-distance lens system is constituted from, in order from an object side to an image surface side, a first lens unit comprising a first lens element in which at least one lens surface thereof is configured as a free-form surface, a second lens unit comprising a second lens element in which at least one lens surface thereof is configured as a free-form surface, and third lens unithaving an aperture diaphragm and being constituted from a lens having a rotationally symmetrical shape, the first lens unit and the second lens unit being movable in a Y-axis direction and moving inmutually opposite directions from each other, whereby the synthetic refractive power of the first lens unit and the second lens unit is variable, a Z-axis being the optical axis of the third lens unit, the Y-axis being the axis orthogonal to the Z-axis on the image surface, and an X-axis being the axis orthogonal to the Y-axis and the Z-axis on the image surface.
(ZH) 本可变焦距透镜系统从物侧到像面侧依次由以下组件构成：第一透镜单元，包括其中至少一个透镜面被配置为自由形态面的第一透镜元件；第二透镜单元，包括其中至少一个透镜面被配置为自由形态面的第二透镜元件；以及第三透镜单元，具有孔径光阑并且由旋转对称形状的透镜构成，第一透镜单元和第二透镜单元能够在Y轴方向上移动，并且通过在彼此相反的方向上移动，由此第一透镜单元和第二透镜单元的合成屈光力是可变的，Z轴是第三透镜单元的光轴，Y轴是像面上的与Z轴正交的轴，并且X轴是像面上的与Y轴和Z轴正交的轴。