結合散射面之穿透式二次光學設計用於白光LED 照明

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林睿騏(Raychiy J. Lin) 查詢紙本館藏

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光電科學與工程學系

論文名稱

結合散射面之穿透式二次光學設計用於白光LED 照明
(White LED Lighting based on Second-Level Optical Design with Transmission Scattering Surfaces)

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摘要(中)

於一般發光二極體光源(Light Emitting Diode, LED)照明應用中，因LED光源之配光曲線具有高指向性，其會造成不舒適之眩光效應，因此於LED光源之二階光學透鏡設計上，除了需達成照明配光曲線之規格要求外，還需要減少對人眼不舒適之眩光影響。本論文提出在LED照明二階光學設計時採用中場光源擬合法、自由曲面與哈維雙向散射分布函數模型設計方法，設計出新式塑膠材質之LED二階光學鏡片。首先，於LED塑膠二階光學鏡片上，其達到89.89 %之高穿透率、角度場半高全寬70度與±45度範圍內之光學有效利用率51.8 %之實心自由曲面鏡片，其可達到節能環保之功效；再者，除了角度場半高全寬70度之塑膠二階光學鏡片設計，運用光學橫向整合之半鏡片曲線設計之自由曲面，而設計之窄角度場LED塑膠二階光學鏡片上，其達到82 %之高穿透率與角度場半高全寬40度之實心自由曲面鏡片；最後，運用光學縱向整合之薄鏡片曲線設計之自由曲面，而設計出達到91.92 %之高穿透率、角度場半高全寬70度與±45度範圍內光學有效利用率55.73 %之薄片自由曲面鏡片，與上面提及之角度場半高全寬70度實心自由曲面鏡片相比，薄片自由曲面鏡片更具備生產效率高16倍與成本減少90%之優勢，其可達到LED塑膠二階光學鏡片大量生產之可行性。

摘要(英)

Since the LED light emitting characteristic is strongly direction oriented and could be
causing the strong glare effect, the optical design of LED lens is necessary for
improving the lighting energy distribution in the areas of interest and reducing the
uncomfortable glare effect for the general illumination applications. In this dissertation,
the novel transparent plastic optical lens would be designed by using the free form
surface and scattering surface technologies. First, using the precise mid field angular
distribution model of the LED light source and the optical scattering surface property
of the Harvey BSDF scattering model and performing the optical simulation to develop
and design a novel plastic high transmission optical thick solid lens with free form
inner surface to achieve the optical performance of 89.89% light energy transmission
optics for the sake of energy saving reason, the 70 degrees angular light distribution
pattern defined at full width half maximum (FWHM) light energy level, and the optical
utilization factor of 51.8 % within -45 degrees and 45 degrees range in the areas of
interest with glare reduced for the down light illumination. Secondly, the free form
optical quasi-lens surface technology was utilized to develop and design a new solid
transparent plastic optical lens for the LED down light with the narrow angular light
distribution requirement in the LED lighting applications. In order to successfully
complete the mission, the precise mid field angular distribution model of the LED light
source was established and built. And also the optical scattering surface property of
the Harvey BSDF scattering model was designed, measured, and established. Then, the optical simulation for the entire optical system was performed to develop and
design this solid transparent plastic optical lens system. Finally, the goals of 40 degrees
angular light distribution pattern defined at full width half maximum (FWHM) with
glare reduced in the areas of interest and the optical performance of nearly 82% light
energy transmission optics were achieved for the LED down light illumination. Thirdly,
the goal of designing and developing a novel plastic optical thin piece lens couple
consisting of a plastic inner thin piece lens with free form optical scattering surfaces
and a plastic outer thin piece lens with an aspherical optical scattering front surface
was to match or exceed the optical performance with the angular light distribution
pattern defined from the previously designed plastic optical thick solid lens. With the
precise mid field angular distribution model of the LED light source and the optical
scattering surface property of the Harvey BSDF scattering models established, both the
performance of 91.92% light energy transmission optics of this novel plastic optical
thin piece lens down light and the optical utilization factor of 55.73 % within -45
degrees and 45 degrees range in the areas of interest with glare reduced were achieved.
Besides the above optical performance achieved, the production rate of the plastic thin
piece lens couples was raised to be 16 times higher than the production rate of the
previously designed plastic optical thick solid lenses. Moreover, the total costs of
producing one plastic thin piece lens couple were calculated to be only 10% of the total
costs of producing one plastic thick solid lens. With both the above advantages of
much higher production rate and much lower costs for producing this plastic optical
thin piece lens couple, the feasibility of the massive production purpose was highly
promising and practical to be achieved for the general LED illumination.

關鍵字(中)

★ 光學設計
★ 自由曲面透鏡

關鍵字(英)

★ Optical Design
★ free form lens

論文目次

Table of Contents
Abstract ........................................................................................................................ I
Acknowledgements ....................................................................................................III
Dedication .................................................................................................................... V
Table of Contents ....................................................................................................... VI
List of Figures ......................................................................................................... VIII
Table List ................................................................................................................. XIII
Chapter 1 Introduction ............................................................................................... 1
1.1 Illumination Background .................................................................................. 2
1.1.1 Fire Lighting devices ................................................................................... 3
1.1.2 Incandescence Lighting devices ................................................................. 3
1.1.3 Fluorescence/Discharge Lighting devices ................................................. 4
1.1.4 Solid-State Lighting devices ....................................................................... 5
1.2 Optical Design Levels for the LED Illumination ............................................ 6
1.3 Research Background and Motivation ............................................................ 8
Chapter 2 Theory ...................................................................................................... 21
2.1 Optics Theory ................................................................................................... 21
2.1.1 The Law of Reflection .............................................................................. 21
2.1.2 The Law of Refraction.............................................................................. 22
2.1.3 The Critical Angle ..................................................................................... 24
2.1.4 Total Internal Reflection .......................................................................... 25
2.1.5 Fresnel Equations ..................................................................................... 25
2.1.6 The Ray Tracing Methods ....................................................................... 27
2.1.7 Introduction to Radiometry and Photometry ....................................... 30
2.1.8 The AΩ Product ( étendue) ...................................................................... 36
2.2 Free Form Optical Surface Design ................................................................ 38
2.3 Optical Surface Scattering .............................................................................. 43
2.3.1 Introduction ............................................................................................... 43
2.3.2 Optical Scattering Surface Transfer Function ....................................... 46
2.3.3 Optical Surface Scattering Simulation ................................................... 48
Chapter 3 A Novel Plastic Light Scattering Free Form High Transmission Optical
Thick Solid Lens ...................................................................................... 54
3.1 Motivation ........................................................................................................ 54
3.2 Optical Modeling Techniques ......................................................................... 56
VII
3.3 Optical Design and Verification ..................................................................... 62
Chapter 4 A Novel Plastic Optical Lens Designed by Integrating the Hex and Fan
Quasi-Lens Surface Curves in the Transverse Direction ................... 69
4.1 Motivation ........................................................................................................ 69
4.2 Optical Modeling Techniques ......................................................................... 70
4.3 Optical Design and Verification ..................................................................... 74
Chapter 5 A Novel Plastic Optical Thin Piece Lens Designed by Integrating the
Inner Thin Piece Lens and the Outer Thin Piece Lens in the
Longitudinal Direction ......................................................................... 85
5.1 Motivation ........................................................................................................ 85
5.2 Optical Modeling Techniques ......................................................................... 87
5.3 Optical Design and Verification ..................................................................... 89
Chapter 6 Conclusions ............................................................................................ 104
References ................................................................................................................ 107

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指導教授

孫慶成(Ching-Cherng Sun)

審核日期

2016-6-13

推文