Short throw back projection system - with double reflection reflex optics using angled mirrors

摘要

A single projector (5) directs a beam onto an image splitter (9) from where two part beams are reflected in opposite directions onto two halves of a back projection screen (1), with each beam reflected twice using two pairs of angled mirrors. The reflex path for the images provides a large magnification without requiring a long projection room. For larger formats, the two half beams can each be split again to form quarter frames on a larger screen. The optics is arranged so that there is no visible gap between the part images. The system is also used for laser beam writing onto special screens.