| 摘要 |
PURPOSE:To condense light having a prescribed width and radiated from a light source into a thin beam with high energy density rigidly and economically by forming one rigid condensing device by an optical medium having a prescribed refractive index. CONSTITUTION:The light source such as an LED is placed on a focal point P of an incident surface 2 and light rays radiated from the light source P are refracted by the incident surface 2 and made incident onto glass as light rays parallel with the optical axis 6. The parallel light rays are reflected by a recessed reflecting surface 4 and condensed on a projected reflecting part 3. The projected reflecting part 3 reflects the condensed light in the direction of a light extracting port 5 as parallel light rays again. Thus, the light is condensed in the direction of the optical axis while being reflected repeatedly between the surfaces 4 and 3. The light condensed up to the diameter of the light extracting port 5 is transmitted through the port 5 and discharged to the outside. Thus, the rigid and economical condensing device is obtained.
|
