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    • 3. 发明公开
    • Zoom lens and optical apparatus having the same
    • Retrofokus Zoomobjektiv mit drei Linsengruppen
    • EP1096287A2
    • 2001-05-02
    • EP00307448.1
    • 2000-08-30
    • CANON KABUSHIKI KAISHA
    • Nanba, NorihiroHoshi, KojiHamano, HiroyukiSekita, Makoto
    • G02B15/177
    • G02B15/177
    • A zoom lens is constructed with, in order from an object side to an image side, a first lens unit of negative optical power, the first lens unit including a negative meniscus lens having a concave surface facing the image side and a positive meniscus lens having a convex surface facing the object side, a second lens unit of positive optical power, the second lens unit including a cemented lens of positive optical power as a whole disposed on the most image side of the second lens unit, and a lens having a concave surface facing the image side and adjoining a surface on the object side of the cemented lens, and a third lens unit of positive optical power, wherein a separation between the first lens unit and the second lens unit and a separation between the second lens unit and the third lens unit are varied to effect variation of magnification.
    • 变焦透镜从物体侧到像侧依次构成具有负光焦度的第一透镜单元,第一透镜单元包括具有面向图像侧的凹面的负弯月形透镜和具有面向像侧的正弯月形透镜, 面向物体侧的凸面,具有正光焦度的第二透镜单元,第二透镜单元整体设置在第二透镜单元的最像侧的正光焦度透镜,以及具有凹面的透镜 表面朝向图像侧并与胶合透镜的物体侧的表面相邻,以及具有正光焦度的第三透镜单元,其中第一透镜单元和第二透镜单元之间的间隔以及第二透镜单元与第二透镜单元之间的间隔 改变第三透镜单元以实现放大率的变化。
    • 6. 发明公开
    • Zoom lens using both a diffractive optical element and a material exhibiting extraordinary partial dispersion
    • 重要信息不确定性
    • EP1933185A1
    • 2008-06-18
    • EP07118368.5
    • 2007-10-12
    • Canon Kabushiki Kaisha
    • Hamano, Hiroyuki
    • G02B15/173G02B1/04G02B27/00
    • G02B15/173G02B1/041G02B27/0037G02B27/0056
    • A zoom lens performs zooming by moving a plurality of lens units and includes a front lens unit (LF) disposed on the object side of an aperture stop (SP) and one diffractive optical part (1a) having positive power, and a rear lens unit (LR) disposed on the image side of said aperture stop (SP) including one refractive optical element (GN) made of a solid material and having a positive refractive power. When vd and θgF are the Abbe number and the partial dispersion ratio, respectively, of the material of the refractive optical element (GN), and fD and fN are the focal lengths of the diffractive optical part (1a) and the refractive optical element (GN), respectively, in air, the following inequalities are satisfied:
      0.755 -7 ·νd 3 + 5.213x10 -5 ·νd 2 - 5.656x10 -3 ·νd)
      80
      The material exhibiting partial dispersion is a synthetic UV-cured resin or N-polyvinyl carbazole.
    • 变焦透镜通过移动多个透镜单元进行变焦,并且包括设置在孔径光阑(SP)的物体侧的前透镜单元(LF)和具有正光焦度的一个衍射光学部件(1a),以及后透镜单元 (LR),其设置在所述孔径光阑(SP)的像侧,包括由固体材料制成并具有正折射光焦度的一个折射光学元件(GN)。 当vd和¸gF分别是折射光学元件(GN)的材料的阿贝数和部分色散比,fD和fN是衍射光学部件(1a)和折射光学元件 (GN),满足以下不等式:0.755 <¸gF - ( - 1.655×10 -7·½d3 + 5.213×10 -5·½d2 - 5.656×10 -3·½d)<1.011和80
    • 10. 发明公开
    • Variable magnification optical system having image stabilizing function
    • Optisches SystemveränderlicherVergrösserungmit Bildstabilisierung
    • EP0872751A1
    • 1998-10-21
    • EP98104787.1
    • 1998-03-17
    • CANON KABUSHIKI KAISHA
    • Hamano, HiroyukiYoshida, Hiroki
    • G02B7/28G02B27/64
    • G02B15/173G02B27/646
    • A variable magnification optical system having an image stabilizing function includes, in order from an object side to an image side, a fixed first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power and a fourth lens unit of positive refractive power. The second lens unit and the fourth lens unit are moved to effect variation of magnification. The third lens unit has a negative lens of meniscus form concave toward the image side and an aspheric surface, and the third lens unit is movable in a direction perpendicular to an optical axis to stabilize an image, or a lens sub-unit constituting part of the third lens unit is movable in the direction perpendicular to the optical axis to stabilize an image.
    • 具有图像稳定功能的可变倍率光学系统包括从物体侧到像侧的顺序为正屈光力的固定的第一透镜单元,负折光力的第二透镜单元,正折光力的第三透镜单元 以及具有正屈光力的第四透镜单元。 移动第二透镜单元和第四透镜单元以实现放大率的变化。 第三透镜单元具有朝向像侧凹入的弯液面的负透镜和非球面,并且第三透镜单元可在垂直于光轴的方向上移动以使图像稳定,或者构成部分的透镜子单元 第三透镜单元可以在垂直于光轴的方向上移动,以稳定图像。