| 摘要 |
A plastic moulded grid for lamp units for ceiling or wall illumination comprising a system of equally spaced tubular bodies, which are bodies of revolution or have a cross-section formed as a planar or spherical polygon, the bodies further having outer convex and inner concave reflecting faces, the reflection preferably being obtained by means of metallizing these faces which are of single or double curvature and have a generant curve with a constant or increasing radius in a direction away from a light source, the center of curvature of the generant curve is placed on the side facing the interior of the tubular body and the curve is preferably of the form y = y . xn. The smallest inner cross-sectional area of the tubular bodies are nearest to the light source. The grid is constructed in such a way that the incident light rays are transmitted both through and between the tubular bodies, the grid producing a pear-shaped light distribution curve in a polar coordinate system, which curve is symmetrical about the 0 DEG axis and extends as a closed curve below the 90 DEG axis and tangent thereto. |
