| 摘要 |
The present invention concerns an optical polarisation device having a source (1) of light emitting a non-polarised light beam, a polarisation separator (3) reflecting one polarisation component of the light beam and transmitting the other polarisation component, and a reflection means (7) receiving the component reflected by the polarisation separator, rotating its polarisation plane through 90 DEG and returning it to the polarisation separator. In the invention, the polarisation separator (3) is a plane element. The reflection means is positioned before the separator and consists of a regular network of prisms (8) covered with a reflective layer associated with a lambda /4 plate (10). The invention applies to back projection. <IMAGE> |
