| 摘要 |
PROBLEM TO BE SOLVED: To provide a light source lamp in which use efficiency of a light beam is enhanced by reducing the diffusion of the light beam owing to reflection. SOLUTION: The light source lamp 1 has a light-emitting tube 2 and a reflection mirror 3, and the reflective surface of the reflection mirror 3 is equipped with a curved reflective surface 4 of the shape of a concave surface, and an irregular reflective surface 5 which is connected to the opening edge of the surface 4. The irregular reflective surface 5 has a constitution that a very small reflecting plate 8 of cubic type are arrayed lengthwise and breathwise, and reflects incident light in the direction parallel to the incident light concerned. Divergent light from the light-emitting tube 2 is surely reflected toward the light-emitting tube 2, when made incident on the irregular reflective surface 5. The light beam made incident on the irregular reflective surface 5 is emitted as parallel light, without being diffused to the outside. Thus, the use efficiency of the light beam and emission luminous intensity can be enhanced. |
