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Apparatus for projection screen esferica more especially for utilizacoes advertising
Apparatus for projection screen esferica more especially for utilizacoes advertising
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机译:投影屏幕埃斯菲里卡的设备,尤其是用于公用广告的设备
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摘要
A screen-forming sphere is made of a front translucent half-sphere and of a rear half-sphere which is opaque except in a central region. An image projector is situated behind the screen and has a front face comprising a platen mounted in front of the optic of the image projector. The platen contains a rotary polarization filter rotated by a first motor. The filter is occultable by a rotary flap mounted on spindles rigidly connected to two rotary vertically aligned disc members which rotate in synchronism under action of a second motor.
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