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    • 8. 发明授权
    • Projection lens with high resolution and reduced overall length
    • 具有高分辨率和缩短整体长度的投影镜头
    • US07580194B2
    • 2009-08-25
    • US11955291
    • 2007-12-12
    • Chun-Ling Lin
    • Chun-Ling Lin
    • G02B9/00
    • G02B15/177
    • An exemplary projection lens includes, in this order from the screen-side thereof, a negative lens group having negative refraction of power, and a positive lens group having positive refraction of power. The positive and negative lens groups each include a number of positive and negative lenses. The focal length of the projection lens is adjustable. The projection lens satisfies the formulas of: −2 56, where F1, and F2 respectively represent the effective focal lengths of the negative lens group and the positive lens group, Fw is the shortest effective focal length of the projection lens, and Vg2 is the average of the Abbe numbers of the positive lenses in the positive lens group.
    • 示例性的投影透镜从其屏幕侧依次包括具有负折射率的负透镜组和具有正的折射率的正透镜组。 正和负透镜组各自包括许多正和负透镜。 投影镜头的焦距可调。 投影透镜满足以下公式:-2 56,其中F1和F2分别表示负透镜组和正透镜组的有效焦距,Fw是投影透镜的最短有效焦距,Vg2是所述投影透镜的阿贝数的平均值 阳性透镜在正透镜组中。