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    • 2. 发明申请
    • Zoom Lens and Image Pickup Apparatus
    • 变焦镜头和图像拾取装置
    • US20100182704A1
    • 2010-07-22
    • US12638788
    • 2009-12-15
    • Atsushi YAMASHITA
    • Atsushi YAMASHITA
    • G02B15/14G03B13/00
    • G02B15/173G03B13/00
    • A zoom lens includes: a first lens group with a positive refractive power, including a reflection optical element; a second lens group with a negative refractive power; a third lens group with a positive refractive power; a fourth lens group with a positive refractive power; and a fifth lens group with a negative refractive power. A power of the zoom lens varies by moving the second lens group, the fourth lens group, and the fifth lens group along an optical axis. A negative lens in the first lens group or a positive lens in the second lens group satisfies the predetermined conditions relating to a refractive index and an Abbe number.
    • 变焦透镜包括:具有正折射力的第一透镜组,包括反射光学元件; 具有负屈光力的第二透镜组; 具有正屈光力的第三透镜组; 具有正屈光力的第四透镜组; 和具有负屈光力的第五透镜组。 通过沿光轴移动第二透镜组,第四透镜组和第五透镜组,变焦透镜的光焦度变化。 第二透镜组中的第一透镜组中的负透镜或正透镜满足与折射率和阿贝数有关的预定条件。
    • 3. 发明申请
    • Zoom Lens
    • 变焦镜头
    • US20090290228A1
    • 2009-11-26
    • US12468798
    • 2009-05-19
    • Atsushi YAMASHITA
    • Atsushi YAMASHITA
    • G02B15/14
    • G02B15/173
    • A zoom lens includes, in order from an object side thereof: a first lens group with a positive refractive power; a second lens group with a negative refractive power; a third lens group with a positive refractive power; a fourth lens group with a negative refractive power; and a fifth lens group with a positive refractive power. A power of the zoom lens is varied by changing intervals between neighboring lens groups in the first through fifth lens groups. The second lens group includes a cemented lens consisting of one positive lens and one negative lens, and the third lens group includes a cemented lens consisting of two positive lenses and one negative lens.
    • 变焦透镜从其物体侧依次包括具有正屈光力的第一透镜组; 具有负屈光力的第二透镜组; 具有正屈光力的第三透镜组; 具有负屈光力的第四透镜组; 以及具有正屈光力的第五透镜组。 通过改变第一至第五透镜组中的相邻透镜组之间的间隔来改变变焦透镜的光焦度。 第二透镜组包括由一个正透镜和一个负透镜组成的胶合透镜,并且第三透镜组包括由两个正透镜和一个负透镜组成的胶合透镜。