| 摘要 |
A reflective type beam splitting and combining device comprises a cubic prism set and three light valves. A first dielectric thin film and a second dielectric thin film are formed on diagonal tangential planes of two sets of opposed surfaces of the prism set so that the prism set can reflect or transmit two light beams of the three primary colors incident from two incidence faces, respectively. The three light valves are arranged on three adjacent surfaces of the prism set to let every two of them be adjacent to each other. The three light valves are used for modulating the three primary colors transmitted or reflected by the prism set. Finally, the three primary color lights are assembled into an output light beam by the prism set. The above optical structure can effectively shorten the back focus to shrink the size and reduce the difficulty in manufacturing.
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