Abstract

A heuristic method to obtain lightpipes that provide both collimation and good spatial uniformity is proposed. The change in shape that is likely to improve spatial uniformity, with minimal efficiency loss, can be predicted. Several case studies where this technique has been used are presented.

© 2008 Optical Society of America

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References

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  1. W. J. Cassarly, in Handbook of Optics, 2nd ed. (McGraw-Hill, 1995).
  2. R. Winston, J. C. Minano, P. Benitez, and W. T. Welford, Nonimaging Optics (Elsevier Academic Press, Amsterdam, Boston, 2005), pp. xi, 497.
  3. F. Fournier and J. Rolland, Appl. Opt. 47, 86 (2008).
    [CrossRef]
  4. X. Ning, R. Winston, and J. O'Gallagher, Appl. Opt. 26, 300 (1987).
    [CrossRef] [PubMed]

2008

F. Fournier and J. Rolland, Appl. Opt. 47, 86 (2008).
[CrossRef]

1987

Benitez, P.

R. Winston, J. C. Minano, P. Benitez, and W. T. Welford, Nonimaging Optics (Elsevier Academic Press, Amsterdam, Boston, 2005), pp. xi, 497.

Cassarly, W. J.

W. J. Cassarly, in Handbook of Optics, 2nd ed. (McGraw-Hill, 1995).

Fournier, F.

F. Fournier and J. Rolland, Appl. Opt. 47, 86 (2008).
[CrossRef]

Minano, J. C.

R. Winston, J. C. Minano, P. Benitez, and W. T. Welford, Nonimaging Optics (Elsevier Academic Press, Amsterdam, Boston, 2005), pp. xi, 497.

Ning, X.

O'Gallagher, J.

Rolland, J.

F. Fournier and J. Rolland, Appl. Opt. 47, 86 (2008).
[CrossRef]

Welford, W. T.

R. Winston, J. C. Minano, P. Benitez, and W. T. Welford, Nonimaging Optics (Elsevier Academic Press, Amsterdam, Boston, 2005), pp. xi, 497.

Winston, R.

X. Ning, R. Winston, and J. O'Gallagher, Appl. Opt. 26, 300 (1987).
[CrossRef] [PubMed]

R. Winston, J. C. Minano, P. Benitez, and W. T. Welford, Nonimaging Optics (Elsevier Academic Press, Amsterdam, Boston, 2005), pp. xi, 497.

Appl. Opt.

Other

W. J. Cassarly, in Handbook of Optics, 2nd ed. (McGraw-Hill, 1995).

R. Winston, J. C. Minano, P. Benitez, and W. T. Welford, Nonimaging Optics (Elsevier Academic Press, Amsterdam, Boston, 2005), pp. xi, 497.

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Figures (5)

Fig. 1
Fig. 1

Illuminance maps at the output of a 30 mm lightpipe for three different profile shapes. The change in shape is a means to spread out illuminance toward the center or the edges, without significantly changing the transmission efficiency.

Fig. 2
Fig. 2

40 mm long solid tapered rod creates a peaked distribution in the center. By making the profile shape slightly convex, nonuniformities decrease by 38%.

Fig. 3
Fig. 3

18.6 mm long hollow square CPC creates a dipped illuminance distribution. When concavity is decreased, nonuniformities decrease by 76%.

Fig. 4
Fig. 4

Pinhole camera images depict what is viewed from a given point within a given NA when looking through the lightpipe.

Fig. 5
Fig. 5

Pinhole camera images for a 30 mm lightpipe with a (a) straight taper and a (b) concave shape, taken respectively at the center and on the edge at the output face. The LED die location is indicated by an X. The other tiles are images of the LED created by the walls of the lightpipe. The concave shape creates additional images of the source at the center, thus increasing illuminance. The opposite effect is observed on the edge.

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