| 摘要 |
An optical projection system has the projector positioned to one side of the screen, and uses a rear projection screen, so that the system has little depth into the area from which the screen may be viewed. This is achieved by directing the beam from the projector towards a large upright mirror positioned behind the screen and at an angle to it, so that the whole of the beam falls on the mirror before being reflected on to the rear face of the screen. |
