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    • 3. 发明授权
    • Projection screen device
    • 投影屏幕设备
    • US5127722A
    • 1992-07-07
    • US538029
    • 1990-06-13
    • Tatsuro Nishitani
    • Tatsuro Nishitani
    • G03B21/56G03B21/58G03B21/60
    • G03B21/602G03B21/585
    • There is disclosed a projection screen device having a high luminance adapted for use in an overhead projector, a video projector or a liquid crystal projector. The projection screen device comprises a flexible screen film and an endless circumfernetial frame tube (hereinafter referred to as frame tube) having at least a flexible characteristic and being tightly connected with an entire circumferential edge of the screen film, the frame tube being expanded by introduction of fluid under pressure so that the screen film is stretched under tension across the frame tube. The screen film comprises a reflection film and a lens film formed in front of the reflection film for reflecting an incident light, the lens film composed of a first group of lenses for expanding the reflected light both rightward and leftward and a second group of lenses for collecting vertical reflected light horizontally, the lens film being subjected to a minute mat on the entire surface thereof.
    • 公开了一种适用于高架投影仪,视频投影仪或液晶投影仪的具有高亮度的投影屏幕装置。 投影屏幕装置包括柔性屏幕膜和至少具有柔性特性的环形圆周框架管(以下称为框架管),并且与屏幕膜的整个周边边缘紧密连接,框架管通过引入而扩展 的压力下的流体,使得筛膜在张力下在框架管上被拉伸。 屏幕膜包括反射膜和形成在用于反射入射光的反射膜前面的透镜膜,透镜膜由第一组透镜构成,用于使反射光向右和向左扩展,第二组透镜用于 水平收集垂直反射光,透镜膜在其整个表面上经受微小的垫。