Abstract
One kind of optical element combining Fresnel lens with microlens array is
designed simply for LED lighting based on geometrical optics and nonimaging
optics. This design method imposes no restriction on the source intensity
pattern. The designed element has compact construction and can produce multiple
shapes of illumination distribution. Taking square lighting as an example,
tolerance analysis is carried out to determine tolerance limits for applying the
element in the assembly process. This element can produce on-axis lighting and
off-axis lighting.
© 2012 Optical Society of America
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