| 摘要 |
PURPOSE:To limit the reflection attenuation on reflecting mirrors to the minimum, utilize bulb light flux to the maximum, and miniaturize a lamp body by arranging the first elliptic reflecting mirror with an electric bulb serving as the first focal point behind the electric bulb, and arranging the second elliptic reflecting mirror with the electric bulb serving as the first focal point between the electric bulb and an aperture. CONSTITUTION:A light source 1 is located at the first focal point of the first elliptic reflecting mirror 5, and the second elliptic reflecting mirror 6 with the first focal point common to the first elliptic reflecting mirror 5 is arranged between the light source 1 and an aperture 2. The light distribution emitted backward from the light source 1 is focused by the first elliptic reflecting mirror 5, the light flux other than the light flux directly fed to the aperture 2 among the light distribution emitted forward from the light source 1 is focused by the second elliptic reflecting mirror 6, and the light flux of the light source 1 is efficiently utilized via one reflection at the most. The light attenuation due to reflection is limited to the minimum, the bulb (light source) light flux can be efficiently utilized to the maximum, and a lamp body can be miniaturized. |
