| 摘要 |
A projection system for projecting an image onto a screen comprising a light source (106) for generating a light beam (105), a polarisation means (110, 112) for transmission of a first part of the light beam (105) polarized in a first direction and reflection of a second part of the light beam (105) polarized in a second direction perpendicular to the first direction, and polarisation conversion means (126) for converting polarisation direction of one of the first or second part of the light beam (105) into the polarisation direction of the other part. The polarisation means (110, 112) are positioned coaxially around a longitudinal centre (104) of the light beam (105) so that the second part of the light beam (105) substantially is reflected towards the centre (104) and that reflection means (122, 124) are positioned at the centre (104) for directing the second part of the light beam (105) in the same direction as the first part of the light beam (105). |
