| 摘要 |
PURPOSE: A projection type modulation system is provided to secure the maximum quantity of R, G, B beams, realize complete black of a brightness signal, improve the productivity, and reduce the costs. CONSTITUTION: The first convex lens(100) interrupts a laser beam transmitted to an optical axis part by forming an interruption element(110) for realizing complete black, and is driven to be movable in optical axis direction and collects the transmitted laser beam for changing a focus. An interruption film element(200) forms a light passing hole(210) for passing light quantity according to the focus position of the first convex lens(100). The second convex lens(300) converges light quantity modulated and diverged by a brightness signal for converting the light into the original parallel light. |
