会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 3. 发明授权
    • Projection screen
    • 投影屏幕
    • US4750808A
    • 1988-06-14
    • US81854
    • 1987-08-05
    • Gerald C. NashGlenn M. BerggrenRobert E. WetmoreDonald R. Stewart
    • Gerald C. NashGlenn M. BerggrenRobert E. WetmoreDonald R. Stewart
    • G03B21/56G03B21/60
    • G03B21/56
    • A projection screen including a rectangular film having a back surface, a front surface and a periphery, a support frame and chamber connected to the periphery of the film for defining the shape of the periphery of the film, a device for creating a pressure differential between the front surface and the back surface of the film, a sensor for sensing the position of the film and indirectly sense the pressure differential on the film and a controller for controlling the device for creating the pressure differential in response to the sensor such that the position of the film is a predetermined position as a result of some pressure differential whereby the shape of the film is set by the shape of the frame which is connected to the periphery of the film and by the predetermined position of the film resulting from the pressure differential.
    • 一种投影屏幕,包括具有后表面,前表面和周边的矩形膜,连接到膜周边的支撑框架和室,用于限定膜周边的形状;用于在膜的周边形成压力差的装置, 膜的前表面和后表面,用于感测胶片位置并间接感测胶片上的压差的传感器,以及控制器,用于响应于传感器控制用于产生压力差的装置,使得位置 由于一些压差的结果,膜的形状是通过连接到膜的周边的框架的形状以及由压差产生的膜的预定位置来设定的。 。