公开(公告)号：US20040130798A1

公开(公告)日：2004-07-08

申请号：US10617880

申请日：2003-07-11

申请人： CHENGDU CRYSTAL TECHNOLOGY CO., LTD.

发明人： Zhiquan Zhang ,  Qiming Xin ,  Rui Zhao ,  Feng Gao ,  Wei Chang

IPC分类号： G02B003/00 ,  G02B009/00

CPC分类号： G02B27/4211 ,  G02B13/16 ,  G02B13/18 ,  G02B27/0037 ,  G02B27/42

摘要： An improved projection system uses a diffractive structure to provide improved image resolution. Display applications using red, green, and blue channel lenses to produce a fill-color image use different diffractive structures to optimize color correction for each of the individual color bands. The preferred location of the diffractive structure is chosen near the aperture stop of the lens to minimize the range of ray incidence angles on the diffractive structure so that diffraction efficiency is maximized for the full field of view. Aspheric surfaces that have both even-power and odd-power terms are used throughout the design. The substantial improvement in image quality provided by the diffractive structure and the novel aspheric surfaces allows shorter object to image distances so that smaller-volume products are made possible.

摘要翻译： 改进的投影系统使用衍射结构来提供改进的图像分辨率。 使用红色，绿色和蓝色通道透镜显示应用程序以产生填充彩色图像使用不同的衍射结构来优化每个单独色带的颜色校正。 衍射结构的优选位置被选择在透镜的孔径光阑附近，以使得衍射结构上的射线入射角的范围最小化，从而使全衍射效率最大化。 在整个设计中都使用具有均匀功率和奇数功率项的非球面。 由衍射结构和新型非球面表面提供的图像质量的实质性改进允许较短的物体到图像距离，使得较小体积的产品成为可能。