利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

12 条记录 (耗时 0.037 秒)

    CONTACT LENS WITH TRANSITION
    9.
    发明申请
    CONTACT LENS WITH TRANSITION 失效
    接触透镜过渡

    公开(公告)号：US20050068490A1

    公开(公告)日：2005-03-31

    申请号：US10675510

    申请日：2003-09-29

    申请人： Robert Mandell ,  Charles Campbell

    发明人： Robert Mandell ,  Charles Campbell

    IPC分类号： G02C7/04

    CPC分类号： G02C7/048 ,  G02C7/042 ,  G02C7/043 ,  G02C7/045

    摘要： A monocentric bifocal contact lens with upper and lower optical power zones is connected by a transition comprising a family of sigmoidal curves. The sigmoidal curve begins with a common tangent at the boundary of the near zone and, with a reversal of sign from the near zone curve, climbs with increasing positive slope to an inflection point, whereupon it continues to climb with decreasing positive slope until reaching the distance zone curve, with which it has a common tangent. There is no discontinuity in the first derivative of the curve throughout its length. A sigmoidal curve can be constructed from numerous mathematical functions, examples of which include polynomial, conic, transendental, or cumulative distribution curves.

    摘要翻译： 具有上光功率区和下光功率区的单中心双焦隐形眼镜通过包括一系列S形曲线的转变来连接。 S形曲线从近区边界处的普通切线开始，并且随着近区曲线的符号反转，随着正斜率增加到拐点，随后以正斜率下降，直到达到 距离区曲线，它具有共同的切线。 曲线的一阶导数在整个长度上没有不连续性。 可以从许多数学函数构建S形曲线，其示例包括多项式，圆锥，Transendental或累积分布曲线。