Free-form illumination lenses designed by a pseudo-rectangular lawnmower algorithm

Parkyn, Bill; Pelka, David G.

doi:10.1117/12.682899

Cited by 31 publications

(20 citation statements)

References 8 publications

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“…Freeform lens plays an important role in LED secondary optics system for redistributing the light to a desirable target plane [1][2][3]. In freeform lens design, due to the complexity of solving Monge-Ampère equation directly [4], ray mapping method [5][6][7][8][9] and supporting surface method [10] have been widely researched in recent years.…”

Section: Introductionmentioning

confidence: 99%

Freeform lenses for illumination of specific shapes in (u,v) coordinate system

Zhang

Liu

2015

Opt Rev

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Lens for rectangular illumination has been designed in (u,v) coordinate system already. Because of light source in (u,v) coordinate system can be divided into two identical parts, we have found that it is possible to design lenses for illumination of specific shapes. Specific shapes include triangles, as well as quadrangles which can be divided into two equal-area parts by one of the diagonals. We partition two equal-area parts into grids separately with equivalent luminous flux as well as light source, after that we construct freeform lenses by ray mapping method. Simulation results show that lenses for illumination of specific shapes are obtained with a Lambertian point source and favorable efficiency is over 0.86.

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Section: Introductionmentioning

confidence: 99%

Freeform lenses for illumination of specific shapes in (u,v) coordinate system

Zhang

Liu

2015

Opt Rev

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“…For generation of an asymmetrical light distribution free-form optical surfaces are used. To compute such optical surfaces different optimization and iterative methods are usually applied [8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

Design method for automotive high-beam LED optics

et al. 2015

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New analytical method for the calculation of the LED secondary optics for automotive high-beam lamps is presented. Automotive headlamps should illuminate the road and the curb at the distance of 100-150 meters and create a bright, flat, relatively powerful light beam. To generate intensity distribution of this kind we propose to use TIR optical element (collimator working on the total internal reflection principle) with array of microlenses (optical corrector) on the upper surface. TIR part of the optical element enables reflection of the side rays to the front direction and provides a collimated beam which incidents on the microrelief. Microrelief, in its turn, dissipates the light flux in horizontal direction to meet the requirements of the Regulations 112, 113 and to provide well-illuminated area across the road in the far field. As an example, we computed and simulated the optical element with the diameter of 33 millimeters and the height of 22 millimeters. Simulation data shows that three illuminating modules including Cree XP-G2 LED and lens allow generating an appropriate intensity distribution for the class D of UNECE Regulations.

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“…However, these methods are not easily generalizable to unique circumstances of geometry or desired energy distributions. One way to overcome this difficulty is to allow the problems to be solved in separate steps by first calculating the mapping relationship based on the source and target distributions and then using that relationship to construct a discrete surface from a normal field calculated by Snell's law [4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Traditionally the energy distribution of the source used for the mapping relationship is sampled on a dummy surface in front of the lens [4][5][6][7][8][9][10][11][12][13]. Although some of the methods listed determine their sampling in angular space [5,8,10,12,13], one can always construct a dummy surface and select points such that the required angular sampling is achieved.…”

Section: Introductionmentioning

confidence: 99%

“…Secondly, when surface information is withheld from the mapping calculation, the relative angular relationship between the surface profile and target plane can only be approximated at best while usually being neglected altogether. Traditionally the input and output distributions are calculated in isolation [4][5][6][7][8][9][10][11][12][13], leaving no ability to incorporate the relative geometries between the two surfaces. A mapping relationship calculated in this manner will be invariant of major changes in the geometry of the system, for example moving the target plane laterally away from the source.…”

Section: Introductionmentioning

confidence: 99%

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Ray mapping with surface information for freeform illumination design

Gannon

Liang

2017

Opt. Express

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Abstract:A novel approach to incorporate surface information into the ray mapping method is proposed. This method calculates irradiance at the physical optical surface and target plane instead of the usually flat or hemispherical dummy surface, resulting in a mapping relationship which reflects the true geometry of the system. The robustness of the method is demonstrated in an extreme example (60° off axis) where the uniformity is as high as 82%.

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Free-form illumination lenses designed by a pseudo-rectangular lawnmower algorithm

Cited by 31 publications

References 8 publications

Freeform lenses for illumination of specific shapes in (u,v) coordinate system

Freeform lenses for illumination of specific shapes in (u,v) coordinate system

Design method for automotive high-beam LED optics

Ray mapping with surface information for freeform illumination design

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