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- W1991386076 abstract "Manufacturing technologies as injection molding or embossing specify their production limits for minimum radii of thevertices or draft angle for demolding, for instance. These restrictions may limit the system optical efficiency or affect thegeneration of undesired artifacts on the illumination pattern when dealing with optical design. A novel manufacturingconcept is presented here, in which the optical surfaces are not obtained from the usual revolution symmetry with respectto a central axis (z axis), but they are calculated as free-form surfaces describing a spiral trajectory around z axis. Themain advantage of this new concept lies in the manufacturing process: a molded piece can be easily separated from itsmold just by applying a combination of rotational movement around axis z and linear movement along axis z, even fornegative draft angles. The general designing procedure will be described in detail." @default.
- W1991386076 created "2016-06-24" @default.
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- W1991386076 date "2011-09-08" @default.
- W1991386076 modified "2023-10-03" @default.
- W1991386076 title "Novel freeform optical surface design with spiral symmetry" @default.
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- W1991386076 doi "https://doi.org/10.1117/12.893707" @default.
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