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    • 7. 发明授权
    • Zoom lens and imaging apparatus
    • 变焦镜头和成像设备
    • US07411731B2
    • 2008-08-12
    • US11553281
    • 2006-10-26
    • Motoyuki OhtakeTsutomu NaitouTakuya TsutsumiEiji YanoKen TanakaTatsuyuki Takahashi
    • Motoyuki OhtakeTsutomu NaitouTakuya TsutsumiEiji YanoKen TanakaTatsuyuki Takahashi
    • G02B27/64
    • G02B15/173G02B27/646
    • A zoom lens includes a varifocal lens unit including a plurality of movable lens groups, and a prism disposed on an image side of the varifocal lens unit. The prism has an incident plane into which a light flux from the varifocal lens unit enters, and an exit plane from which the light flux is emitted toward an image plane, the exit plane capable of being inclined with respect to an optical axis, the exit plane inclined in accordance with a following conditional expression “α=−f×θ/[Bf(n−1)]”, where α: an angle formed by a normal of the exit plane and the optical axis, f: a focus distance of a whole lens system, θ: a turning angle of a lens system, Bf: a distance from the exit plane of the prism to the image plane along the optical axis, and n: a refraction index of the prism.
    • 变焦透镜包括包括多个可移动透镜组的变焦透镜单元和设置在变焦透镜单元的像侧上的棱镜。 棱镜具有入射平面,来自变焦透镜单元的光束进入入射平面,以及出射平面,光束从该平面朝向像面发射,出射平面能够相对于光轴倾斜,出射面 根据以下条件表达式“α= -fxtheta / [Bf(n-1)]”倾斜的平面,其中α:由出射平面和光轴的法线形成的角度,f: 整个透镜系统,θ:透镜系统的转角,Bf:从棱镜的出射平面到光轴的像面的距离,以及n:棱镜的折射率。
    • 9. 发明授权
    • Zoom lens and image-pickup apparatus
    • 变焦镜头和摄像装置
    • US07706080B2
    • 2010-04-27
    • US10589675
    • 2005-10-04
    • Motoyuki OhtakeShinichi Arita
    • Motoyuki OhtakeShinichi Arita
    • G02B15/14
    • G02B15/173G02B27/646
    • To provide a zoom lens capable of achieving stable optical quality by inhibiting an effect of assemble errors during manufacturing. A zoom lens includes a positive first lens group G1, a negative second lens group G2, a positive third lens group G3, and a positive fourth lens group G4, which are arranged from an object side in that order, and during variation in lens position from a wide angle end state to a telescopic end state, G1 and G3 are fixed, G2 is moved toward an image side, G4 moves so as to compensate fluctuations in image-surface position due to the shift of G2, and an aperture diaphragm S is fixed adjacent to the object side of G3, etc. G2 includes a negative meniscus lens L21 with a concave surface opposing the image side and a cemented lens L22 of a biconcave lens and a positive lens with a convex surface opposing the object side, which are arranged from the object side in that order, and the negative meniscus lens is a compound lens of a glass lens and a resin lens PL formed adjacent to the image side of the glass lens, the lens surface adjacent to the image side of the resin lens is aspheric, and the conditional equation (1) below is satisfied: n2>1.75,   (1) where n2 is the average refractive index of glass constituting G2.
    • 提供能够通过抑制制造过程中组装误差的影响而能够实现稳定的光学质量的变焦透镜。 变焦透镜包括从物体侧依次布置的正的第一透镜组G1,负的第二透镜组G2,正的第三透镜组G3和正的第四透镜组G4,以及在透镜位置的变化 从广角端状态到伸缩端状态,G1和G3是固定的,G2朝向图像侧移动,G4移动以补偿由于G2的偏移引起的图像表面位置的波动,以及孔径光阑S 被固定在G3的物体侧附近,G2包括具有与图像侧相对的凹面的负弯月形透镜L21和双凸透镜的胶合透镜L22和具有与物侧相对的凸面的正透镜, 从物体侧依次排列,负弯月形透镜是与玻璃透镜的像侧相邻形成的玻璃透镜和树脂透镜PL的复合透镜,与树脂的像侧相邻的透镜面 镜头是非球面的,而t 满足以下条件式(1):n2> 1.75,(1)其中n2是构成G2的玻璃的平均折射率。
    • 10. 发明申请
    • Zoom Lens and Image-Pickup Apparatus
    • 变焦镜头和图像拾取装置
    • US20090109545A1
    • 2009-04-30
    • US10589675
    • 2005-10-04
    • Motoyuki OhtakeShinichi Arita
    • Motoyuki OhtakeShinichi Arita
    • G02B15/16
    • G02B15/173G02B27/646
    • To provide a zoom lens capable of achieving stable optical quality by inhibiting an effect of assemble errors during manufacturing. A zoom lens includes a positive first lens group G1, a negative second lens group G2, a positive third lens group G3, and a positive fourth lens group G4, which are arranged from an object side in that order, and during variation in lens position from a wide angle end state to a telescopic end state, G1 and G3 are fixed, G2 is moved toward an image side, G4 moves so as to compensate fluctuations in image-surface position due to the shift of G2, and an aperture diaphragm S is fixed adjacent to the object side of G3, etc. G2 includes a negative meniscus lens L21 with a concave surface opposing the image side and a cemented lens L22 of a biconcave lens and a positive lens with a convex surface opposing the object side, which are arranged from the object side in that order, and the negative meniscus lens is a compound lens of a glass lens and a resin lens PL formed adjacent to the image side of the glass lens, the lens surface adjacent to the image side of the resin lens is aspheric, and the conditional equation (1) below is satisfied: n2>1.75,   (1) where n2 is the average refractive index of glass constituting G2.
    • 提供能够通过抑制制造过程中组装误差的影响而能够实现稳定的光学质量的变焦透镜。 变焦透镜包括从物体侧依次布置的正的第一透镜组G1,负的第二透镜组G2,正的第三透镜组G3和正的第四透镜组G4,以及在透镜位置的变化 从广角端状态到伸缩端状态,G1和G3是固定的,G2朝向图像侧移动,G4移动以补偿由于G2的偏移引起的图像表面位置的波动,以及孔径光阑S 被固定在G3的物体侧附近,G2包括具有与图像侧相对的凹面的负弯月形透镜L21和双凸透镜的胶合透镜L22和具有与物侧相对的凸面的正透镜, 从物体侧依次排列,负弯月形透镜是与玻璃透镜的像侧相邻形成的玻璃透镜和树脂透镜PL的复合透镜,与树脂的像侧相邻的透镜面 镜头是非球面的,而t 满足下列条件式(1):<?in-line-formula description =“In-line formula”end =“lead”?> n2> 1.75,(1)<?in-line-formula description =“In 线公式“end =”tail“?>其中n2是构成G2的玻璃的平均折射率。