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公开(公告)号：US5966247A
公开(公告)日：1999-10-12
申请号：US994313
申请日：1997-12-19
IPC分类号： G02B13/18 , G02B15/177 , G02B15/20 , G20B15/22
CPC分类号： G02B15/177
摘要： A zoom lens comprises a plurality of lens elements arranged into three zooming lens units. These zooming lens units are spaced from one another by axial distances that vary during zooming. The lens units are a negative power front lens unit, a positive power middle lens unit and a negative power rear lens unit. At least one of the lens units continually moves away from the image plane, as the zoom lens zooms from a wide angle position toward a telephoto position so that the distance from this lens unit to the image plane varies in sigmoidal relation with respect to the focal length of the zoom lens.
摘要翻译： 变焦透镜包括布置成三个变焦透镜单元的多个透镜元件。 这些变焦镜头单元在变焦期间彼此间隔开轴向距离。 透镜单元是负功率前透镜单元，正功率中间透镜单元和负功率后透镜单元。 透镜单元中的至少一个连续地远离图像平面移动，因为变焦透镜从广角位置朝远摄位置放大，使得从该透镜单元到像面的距离相对于焦点以S形关系变化 变焦镜头的长度。
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公开(公告)号：US06972903B2
公开(公告)日：2005-12-06
申请号：US10474415
申请日：2002-04-12
申请人： Hideo Hara , Kazunaga Shimizu , Fumiaki Koizumi , Yasuhiro Sakai
发明人： Hideo Hara , Kazunaga Shimizu , Fumiaki Koizumi , Yasuhiro Sakai
CPC分类号： G02B27/0172 , G02B2027/0129 , G02B2027/0178
摘要： A vision assisting apparatus includes a casing for forming an inversely U-shaped optical path, a light entry, provided at one end of the optical path, through which light enters, a light exit, provided at another end of the optical path, through which light exits in an opposite direction to the light entry, an optical system for processing an image entered via the light entry by using the optical pass and outputting a processed image via the light exit, and attaching structure for attaching the casing to a wearer so that the light exit is positioned close to an eye of the wearer. By forming the inversely U-shaped optical path with the casing, it is possible to provide a sufficiently long optical path in a compact form. Accordingly it is possible to provide the vision assisting apparatus that does not hide facial expressions, is easy to use, and can provide a sufficient length for setting a magnifying optical system without extending the distance in the horizontal direction between the light entry and the light exit.
摘要翻译： 视觉辅助装置包括用于形成反U型光路的壳体，设置在光路入射的光路的一端的光入口，设置在光路的另一端的光出射口，通过该光入口 光以与光入口相反的方向射出，用于通过使用光学通过处理通过光入口输入的图像的光学系统，并且经由光出口输出经处理的图像，以及用于将外壳附接到佩戴者的附接结构，使得 光出口靠近佩戴者的眼睛定位。 通过与壳体形成相反的U形光路，可以以紧凑的形式提供足够长的光路。 因此，可以提供不隐藏面部表情的视觉辅助装置，易于使用，并且可以提供足够的长度来设置放大光学系统，而不会延伸光入射和光出口之间的水平方向上的距离 。
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公开(公告)号：US06844987B2
公开(公告)日：2005-01-18
申请号：US10614135
申请日：2003-07-08
申请人： Hiroshi Endo , Michio Cho , Kazunaga Shimizu
发明人： Hiroshi Endo , Michio Cho , Kazunaga Shimizu
IPC分类号： G02B15/16 , G02B13/18 , G02B15/177 , G02B13/04 , G02B15/14
CPC分类号： G02B15/177
摘要： A zoom lens includes first to fourth lenses in order from an object side. The first lens has negative refracting power and a concave surface thereof faces the object side. The second and fourth lenses have positive refracting power. The third lens has negative refracting power. The zoom lens as a whole is constituted of a first lens group having positive refracting power, and a second lens group having negative refracting power. The following conditions are satisfied, −2.7
摘要翻译： 变焦透镜从物体侧起按顺序包括第一至第四透镜。 第一透镜具有负折射率，并且其凹面面向物体侧。 第二和第四透镜具有正折射力。 第三透镜具有负折射力。 变焦透镜整体由具有正折射率的第一透镜组和具有负折射光焦度的第二透镜组构成。 满足以下条件：-2.7
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