| 摘要 |
<p>The hemispherical, semi-transparent device is for projection transmission on the exterior of the hemisphere and observation of this picture on the inside of the hemisphere. It uses a projector screen (2) which is hemispherical. The screen is air-tightly connected along the periphery of a transparent, mainly circular plate (1). The device can be advantageously inflated to adopt the shape of a hemisphere, whilst in the empty state it is virtually flat and can be stored without taking up space. Along the periphery of the circular plate there can be a rigid extension of the hemispherical projection screen.</p> |
