Design of a novel free-form condenser overcoming rotational symmetry limitations

Miñano, Juan C.; Benı́tez, Pablo; Blen, José; Santamaría, Asunción

doi:10.1117/12.794247

Cited by 2 publications

(4 citation statements)

References 10 publications

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“…Four families of solutions were defined according to the signs of the magnifications related with each pair of wavefront couple. These families are more detailed analyzed in [17]. There is still another Boolean variable to be added to the signs of the magnifications, raising the four families of XX solutions to eight).…”

Section: Design Of the XX Condensermentioning

confidence: 98%

“…The XX configuration and geometry given in [17] can also be applied for the problem of coupling the rays issuing a cylindrical source into a rectangular target. This is of practical interest in condenser applications, because the resulting design, as shown below, can efficiently couple the light from an arc into a rectangular aperture.…”

Section: Design Of the XX Condensermentioning

confidence: 99%

“…SMS-designed dual reflector devices are herein termed XX. A more detailed explanation of the design procedure of the XX condenser is given in [17].…”

Section: Design Of the XX Condensermentioning

confidence: 99%

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High-efficiency free-form nonimaging condenser overcoming rotational symmetry limitations

et al. 2008

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The importance of condenser optics is the fact that it is the bottleneck limiting efficiency in commercially available projection systems. Conventional condensers use rotational symmetric devices, most of them being elliptic or parabolic mirrors. They perform very far from the theoretical limits for sources such as arc lamps or halogen bulbs. Typical small displays in the 5-15 mm 2 etendue range have geometrical efficiencies about 40-50% for the best condensers; although theory allows about 100% (no reflection nor absorption losses are considered). The problem is in the coma aberration of the reflectors and the rotational symmetric image of the source making the source projected image to unfit with the target. Thus, the only way to improve this performance is to generate a free form design that is able to control the shape and rotation of the source projected images. As yet, this can only be done with the SMS3D design method. We present here one of such designs achieving a collection efficiency 1.8 times that of an elliptical condenser for a 4:1 target aspect ratio and for the range of target etendue with practical interest and 1.5 for 16:9 target. These designs use only 1 additional reflection, i.e., use a total of 2 reflections from the source to the target. A prototype of one type of free form condenser has already been built.

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Section: Design Of the XX Condensermentioning

confidence: 98%

Section: Design Of the XX Condensermentioning

confidence: 99%

See 1 more Smart Citation

High-efficiency free-form nonimaging condenser overcoming rotational symmetry limitations

et al. 2008

Self Cite

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show abstract

“…Four families of solutions were defined according to the signs of the magnifications. These families are more detailed analyzed in [17]. There is still another Boolean variable to be added to the signs of the magnifications, raising the four families of XX solutions to eight …”

Section: Design Of the XX Condensermentioning

confidence: 99%

High-efficiency free-form nonimaging condenser overcoming rotational symmetry limitations

Miñano¹,

Benı́tez

Blen

et al. 2008

SPIE Proceedings

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The importance of condenser optics is the fact that it is the bottleneck limiting efficiency in commercially available projection systems. Efficiency is a key parameter of projector performance, since it augments screen luminance, enabling the system to perform well under increasing levels of ambient light. Conventional condensers use rotational symmetric devices, most of them being elliptic or parabolic mirrors. They perform very far from the theoretical limits for sources such as arc lamps or halogen bulbs. Typical small displays in the 5-15 mm 2 etendue range have geometrical efficiencies about 40-50% for the best condensers; although theory allows about 100% (no reflection nor absorption losses are considered). The problem is in the coma aberration of the reflectors and the rotational symmetric image of the source making the source projected image to unfit with the target. Thus, the only way to improve this performance is to generate a free form design that is able to control the shape and rotation of the source projected images. As yet, this can only be done with the SMS3D design method. We present here one of such designs types achieving a collection efficiency that is 1.8 times that of an elliptical condenser for a 4:1 target aspect ratio and for the range of target etendue with practical interest and 1.5 for 16:9 target. These designs use only 1 additional reflection, i.e., use a total of 2 reflections from the source to the target. A prototype of one type of free form condenser has already been built.

show abstract

Design of a novel free-form condenser overcoming rotational symmetry limitations

Cited by 2 publications

References 10 publications

High-efficiency free-form nonimaging condenser overcoming rotational symmetry limitations

High-efficiency free-form nonimaging condenser overcoming rotational symmetry limitations

High-efficiency free-form nonimaging condenser overcoming rotational symmetry limitations

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