| 摘要 |
PURPOSE:To improve the economical efficiency and practical use of LED display lamps by arranging the LED lamps on an incident line formed from the focus of a parabolic face constituting of an optical reflector to respective parts of the optical reflector. CONSTITUTION:Since the just front or an arrangement base 4 can not be utilized for reflection, LED lamps 51 necessary for securing front light intensity are arranged on a planar disk fitting face 9. Since the periphery of the base 4 sends parallel light beams to a light dispersion filter 2 through the optical reflector 3, a spherical face B is constituted so that the LED lamps 51 are arranged on a light incident line formed from the focus P of a parabolic face constituting the reflector 2 to respective parts of the reflector 3. A step part D is formed on the spherical face B and the step part D removes a fault part existing on a process that peripheral light is reflected by the reflector 3 and arrived at the filter 2 and also removes the generation of a dark part on a boundary between the reflecting face and front direct light.
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