Figure 5.21 Cross-section geometry of a
desired reflector cavity.
Other Diverging Optics
Pillow lenses are the most popular diverging
optic used in automotive signal lamps, however,
other types exist which produce similar effects
but have different appearances. Alternate types
of diverging optics include: diffuse lenses,
faceted lenses, rod lenses, and many others
including combinations of the above. For
example, diffuse lenses produce a uniform lit
appearance and a cloudy unlit appearance. Pillow
lenses can be diffused by bead-blasting the pillow
lens surface on the mold tool resulting in a less
efficient optic, but one that is more uniform in
appearance when lit.
Figure 5.22 Geometry of a parabola.
Figure 5.23 LED position relative to the
parabola.
Figure 5.24 Design of parabolic reflector
with f = 0.66 mm.
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