| 摘要 |
A compact projection device comprises an illuminating optical system, a display chip (114), and a projection lens group (115). The illuminating optical system comprises three-primary-colors light sources (101, 102, 103), and comprises three collimation lens groups (104, 105, 106) and three compound-eye lenses (107, 108, 109) that are corresponding to the three-primary-colors light sources (101, 102, 103) in a one-to-one manner, and also comprises a crossover-type light-combination lens group (110, 111) that combines light beams from the three-primary-colors light sources (101, 102, 103) and that comprises a first dichroic mirror (110) and a second dichroic mirror (111). In the compact projection device, three light sources and collimation light paths thereof are independent to each other, brightness balance is performed on corresponding light paths by using the three compound-eye lenses (107, 108, 109), and then light combination is performed on three light paths by using the small-size crossover-type light-combination lens group (110, 111). The compact projection device has a compact, simple and proper structure, the optical path is shortened, and the output power of each light source is ensured. |
