| 摘要 |
PURPOSE:To obtain a desired light distribution pattern through the luminous flux of a reflector by using a certain structured surface as a reflector part. CONSTITUTION:The focal point F of radiation rays is defined as an origin of coordinates of a crossing axis 3. The reflecting surface of a reflector 11 is set in such a way that the angle theta of the light ray reflected at x/2 becomes zero. Outside a reference point x/2, thetan is reduced in proportion to {(x/2)-xn}<2>, and it becomes -theta deg. on the right end point, while, in the left direction from the reference point, thetan is increased in proportion to {(x/2)-xn}, and the shape of the reflector 11 is set in such a way that it will be theta deg. on the point (center) where an X coordinate is zero. Areas 14r, 14l are overlapped with each other on a screen at the time, and the light ray distribution pattern that is slightly extended in the upward direction at a diffusion angle theta deg. is obtained. |
