| 摘要 |
A reflecting surface provides a controlled degree of diffusion by forming a number of generally congruent depressions of predetermined depth and shape. The surface prior to forming the depressions is typically essentially a specular reflecting surface. The depressions may be formed by placing the specular reflecting sheet between two opposed dies having intermeshing projections, each projection typically covering about one-third the area between adjacent projections and of generally pyramidal shape with rounded tops.
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