| 摘要 |
PURPOSE:To eliminate the luminance unevenness caused by constituting the light emitting surface of a lighting fixture from strip reflecting surfaces, and to thin the lighting fixture by forming each reflecting surface into a parabolic prism to provide the reflecting surface having a short forcal distance. CONSTITUTION:Reflecting surfaces 2a-2c formed by distributing the light emitting surface in strip are the paraboloids having the forcal line LF, and light sources 3a-3c are located so as to coincide with the forcal line LF. The refraction prism and the reflection prism are gathered to form the Fresnel cut having the forcal point at the virtual image P on the surface comprising the forcal line LF and the virtual image P, and the Fresnel cut is extended in the horizontal direction to be a liner Fresnel lens 4. Since the beam from the light source 3a-3c are unifired as the parallel beams and are threw to an outside lens 5, the lens 5 may be cut as same as the conventional cut. In this structure, the light fixture thin and having a little luminance unevenness can be obtained. |
