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    • 20. 发明申请
    • Total internal reflection fresnel lens systems, assemblies, and methods
    • 全内反射菲涅尔透镜系统,组件和方法
    • US20070297051A1
    • 2007-12-27
    • US11810489
    • 2007-06-06
    • Yu HuangAdnan Malik
    • Yu HuangAdnan Malik
    • G03B21/60G02B3/08
    • G03B21/10G03B21/625
    • Off-axis total internal reflection Fresnel lenses and projection screens are disclosed that, when combined, enable construction of projection assemblies for rear-projection-type screen devices (e.g., projection television systems) that are thinner, provide easier handling and maintenance, and have improved contrast, focusing, and resolution when compared with conventional projection screen devices. The off-axis Fresnel lens comprises a plurality of concentric, outwardly-extending, total internal reflection-type prism facets, the top side of which may be aspherical. Embodiments of the invention also include projection screens having at least one diffuser and one lenticular lens. In addition, one or more opaque layers may be used to improve contrast. The various components, e.g., the fresnel lens, the diffuser, the lenticular lens(es), the opaque layer(s), etc. are all combined, or connected, in such a way as to eliminate substantially all air gaps within the connections.
    • 离轴全内反射菲涅尔透镜和投影屏幕被公开,当组合时,能够构造更薄的后投影式屏幕装置(例如,投影电视系统)的投影组件,从而提供更容易的处理和维护,并具有 与传统的投影屏幕设备相比,改善了对比度,对焦和分辨率。 离轴菲涅尔透镜包括多个同心的,向外延伸的全内反射型棱镜面,其顶侧可以是非球面。 本发明的实施例还包括具有至少一个漫射器和一个双凸透镜的投影屏幕。 此外,可以使用一个或多个不透明层来改善对比度。 各种组件,例如菲涅尔透镜,漫射器,双凸透镜,不透明层等都被组合或连接,以便基本上消除连接内的所有空气间隙 。