| 摘要 |
A lighting fixture includes a grating of discontinuities that is integrally molded in a translucent member for spatially modulating light from a light source of the fixture. A translucent lens forms an outer envelope portion of the fixture, the grating being mounted between the light source and the lens. A reflector mounted opposite the light source from the grating enhances light transmission through the grating. A semi-reflective shell member in front of the light source, used alone or in combination with a geodesicly segmented reflector opposite the light source, greatly enhances the visual effects of the fixture by projecting multiple images of the light source through the grating. A mold for molding the grating includes a large plurality of metallic grating lines corresponding to a diffraction pattern for defining the grating surface; a metallic substrate rigidly connecting the grating lines; a cavity member for defining portions of a mold cavity, the substrate being connected to the cavity member with the grating lines facing the cavity and defining at least a portion of the cavity, whereby the grating surface forms a multiplicity of surface discontinuities on a molded article.
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