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    • 13. 发明授权
    • Wide angle zoom lens
    • 广角变焦镜头
    • US4469412A
    • 1984-09-04
    • US551492
    • 1983-11-14
    • Akira TajimaKeiji Ikemori
    • Akira TajimaKeiji Ikemori
    • G02B13/04G02B13/18G02B15/14G02B15/16G02B15/177
    • G02B15/177G02B13/18G02B15/14
    • The wide angle zoom lens disclosed includes, from front to rear, a negative first lens group and a positive second lens group, both of which are moved axially in variable relation to each other to effect a change in the image magnification. The first lens group includes, front to rear, a first lens with a rear surface of strong negative refractive power, a second lens of convex curvature towards the front with a focal length having an absolute value not less than 30 times the shortest focal length of the entire system and with at least one of the surfaces thereof aspherical and a positive meniscus 3rd lens of forward convexity. According to one embodiment, the second lens is made of glass and according to another, of plastic.
    • 所公开的广角变焦透镜包括从前到后的负的第一透镜组和正的第二透镜组,它们彼此以可变的关系轴向移动以实现图像放大率的变化。 第一透镜组包括从前到后的具有强负折射力的后表面的第一透镜,具有朝向前方的凸曲率的第二透镜,焦距的绝对值不小于 整个系统和其至少一个表面非球面和正弯月面第三透镜的前凸。 根据一个实施例,第二透镜由玻璃制成,并且根据另一个塑料制成。
    • 14. 发明授权
    • Zoom lens having two movable lens groups
    • 变焦镜头具有两个可移动镜头组
    • US4299452A
    • 1981-11-10
    • US898807
    • 1978-04-24
    • Keiji Ikemori
    • Keiji Ikemori
    • G02B13/04G02B15/16G02B15/177
    • G02B15/177
    • The present invention relates to a photographic lens capable of zooming by independently moving the front lens group and the rear lens group. The front lens group presents a negative meniscus lens, a biconcave lens and a positive lens, while the rear lens group presents two positive lenses, a positive meniscus lens, a biconcave lens and a positive lens. Let the focal length of the front lens group be Fl, the longest focal length of the total system be Ft and the distance between the secondary principal point of the front lens group and the primary principal point of the rear lens group when the focal length is Et, the zoom lens satisfies the following relations. ##EQU1##
    • 本发明涉及能够通过独立地移动前透镜组和后透镜组来变焦的摄影镜头。 前透镜组呈现负弯月透镜,双凹透镜和正透镜,而后透镜组呈现两个正透镜,正弯月透镜,双凹透镜和正透镜。 假设前透镜组的焦距为F1,总系统的最长焦距为Ft,前透镜组的次要主点与后透镜组的主要主点之间的距离为焦距为 Et,变焦镜头满足以下关系。
    • 16. 发明授权
    • Retrofocus type wide angle objective lens
    • 改进型宽角度目标镜头
    • US4111558A
    • 1978-09-05
    • US715491
    • 1976-08-18
    • Keiji Ikemori
    • Keiji Ikemori
    • G02B13/04G02B11/34
    • G02B13/04
    • A retrofocus type wide angle objective lens comprising from front to rear a diverging first lens component having a non-spherical surface formed therein, a converging second lens component, a diaphragm, and a converging third lens component, whereby the second component includes a positive front lens followed by a negative lens, said positive and said negative lenses defining therebetween a first air lens of which the focal length is negative in sign, and the third component includes a negative front lens followed by a positive lens, said negative and said positive lenses defining therebetween a second air lens of which the focal length is also negative. The provision of these first and second air lenses facilitates achievement of good correction of aberrations particularly astigmatism which would be otherwise under-corrected by the introduction of the non-spherical surface into the first component.