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Freeform Optics For Led Packages And Applications
Freeform Optics For Led Packages And Applications
Edición/Edição:
Autores: K. Wang; Sheng Liu; Dan Wu
Editorial:
ISBN: 9781118749715
Formato: Rústica/Paperback
Nº volumenes: 1 Páginas: 352
Año publicación/Ano de publicação: 2017
Disponibilidad/Disponibilidade: 15 días
Precio/Preço : 143,17 € 136,01 € (141,45€ iva incluído)
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· Freeform Optics For Led Packages And Applications (K. Wang; Sheng Liu; Dan Wu)
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Descripción/Descrição
A practical introduction to state-of-the-art freeform optics design for LED packages and applications

By affording designers the freedom to create complex, aspherical optical surfaces with minimal or no aberrations, freeform design transcends the constraints imposed by hundreds of years of optics design and fabrication. Combining unprecedented designfreedom with precise light irradiation control, freeform optics design is also revolutionizing the design and manufacture of high quality LED lighting. The first and only book of its kind, Freeform Optics for LED Packages and Applications helps put readers at the forefront of the freeform optics revolution.

Designed to function as both an authoritative review of the current state of the industry and a practical introduction to advanced optical design for LED lighting, this book makes learning and mastering freeform optics skills simpler and easier than everbefore with:
◾Real-world examples and case studies systematically describing an array of algorithms and designs—from new freeform algorithms to design methods to advanced optical designs
◾Coding for all freeform optics algorithms covered—makes it easier and more convenient to start developing points of freeform optics and construct lenses or reflectors, right away
◾Case studies of a range of products, including designs for a freeform optics LED bulb, an LED spotlight, LED street lights, an LED BLU, and many more

Freeform Optics for LED Packages and Applications is must-reading for optical design engineers and LED researchers, as well as advanced-level students with an interest in LED lighting. It is also an indispensable working resource design practitionerswithin the LED lighting industry.

Table of Contents

Preface xi

1 Introduction 1

1.1 Overview of LED Lighting 1

1.2 Development Trends of LED Packaging and Applications 5

1.3 Three Key Issues of Optical Design of LED Lighting 7

1.3.1 System Luminous Efficiency 7

1.3.2 Controllable Light Pattern 7

1.3.3 Spatial Color Uniformity 8

1.4 Introduction of Freeform Optics 10

References 12

2 Review of Main Algorithms of Freeform Optics for LED Lighting 15

2.1 Introduction 15

2.2 Tailored Design Method 16

2.3 SMS Design Method 17

2.4 Light Energy Mapping Design Method 18

2.5 Generalized Functional Design Method 19

2.6 Design Method for Uniform Illumination with Multiple Sources 22

References 22

3 Basic Algorithms of Freeform Optics for LED Lighting 25

3.1 Introduction 25

3.2 Circularly Symmetrical Freeform Lens – Point Source 25

3.2.1 Freeform Lens for Large Emitting Angles 26

3.2.2 TIR-Freeform Lens for Small Emitting Angle 33

3.2.3 Circularly Symmetrical Double Surfaces Freeform Lens 39

3.3 Circularly Symmetrical Freeform Lens – Extended Source 42

3.4 Noncircularly Symmetrical Freeform Lens – Point Source 48

3.4.1 Discontinuous Freeform Lens Algorithm 49

3.4.2 Continuous Freeform Lens Algorithm 55

3.5 Noncircularly Symmetrical Freeform Lens – Extended Source 60

3.6 Reversing the Design Method for Uniform Illumination of LED Arrays 63

3.6.1 Reversing the Design Method of LIDC for Uniform Illumination 64

3.6.2 Algorithm of a Freeform Lens for the Required LIDC 66

References 68

4 Application-Specific LED Package Integrated with a Freeform Lens 71

4.1 Application-Specific LED Package (ASLP) Design Concept 71

4.2 ASLP Single Module 72

4.2.1 Design Method of a Compact Freeform Lens 72

4.2.2 Design of the ASLP Module 73

4.2.3 Numerical Analyses and Tolerance Analyses 76

4.3 ASLP Array Module 85

4.4 ASLP System Integrated with Multiple Functions 87

4.4.1 Optical Design 89

4.4.2 Thermal Management 91

4.4.3 ASLP Module 94

References 96

5 Freeform Optics for LED Indoor Lighting 99

5.1 Introduction 99

5.2 A Large-Emitting-Angle Freeform Lens with a Small LED Source 99

5.2.1 A Freeform Lens for a Philip Lumileds K2 LED 100

5.2.2 Freeform Lens for a CREE XLamp XR-E LED 103

5.3 A Large-Emitting-Angle Freeform Lens with an Extended Source 108

5.3.1 Target Plane Grids Optimization 108

5.3.2 Light Source Grids Optimization 108

5.3.3 Target Plane and Light Source Grids Coupling Optimization 109

5.4 A Small-Emitting-Angle Freeform Lens with a Small LED Source 110

5.5 A Double-Surface Freeform Lens for Uniform Illumination 113

5.5.1 Design Example 1 114

5.5.2 Design Example 2 115

5.5.3 Design Example 3 116

5.6 A Freeform Lens for Uniform Illumination of an LED High Bay Lamp Array 117

5.6.1 Design Concept 117

5.6.2 Design Case 118

References 124

6 Freeform Optics for LED Road Lighting 125

6.1 Introduction 125

6.2 The Optical Design Concept of LED Road Lighting 126

6.2.1 Illuminance 127

6.2.2 Luminance 128

6.2.3 Glare Restriction Threshold Increment 129

6.2.4 Surrounding Ratio 130

6.3 Discontinuous Freeform Lenses (DFLs) for LED Road Lighting 131

6.3.1 Design of DFLs for Rectangular Radiation Patterns 131

6.3.2 Simulation Illumination Performance and Tolerance Analyses 134

6.3.3 Experimental Analyses 139

6.3.4 Effects of Manufacturing Defects on the Lighting Performance 139

6.3.5 Case Study – LED Road Lamps Based on DFLs 152

6.4 Continuous Freeform Lens (CFL) for LED Road Lighting 154

6.4.1 CFL Based on the Radiate Grid Mapping Method 154

6.4.2 CFL Based on the Rectangular Grid Mapping Method 154

6.4.3 Spatial Color Uniformity Analyses of a Continuous Freeform Lens 158

6.5 Freeform Lens for an LED Road Lamp with Uniform Luminance 164

6.5.1 Problem Statement 164

6.5.2 Combined Design Method for Uniform Luminance in Road Lighting 166

6.5.3 Freeform Lens Design Method for Uniform-Luminance Road Lighting 171

6.6 Asymmetrical CFLs with a High Light Energy Utilization Ratio 174

6.7 Modularized LED Road Lamp Based on Freeform Optics 178

References 178

7 Freeform Optics for a Direct-Lit LED Backlighting Unit 181

7.1 Introduction 181

7.2 Optical Design Concept of a Direct-Lit LED BLU 183

7.3 Freeform Optics for Uniform Illumination with a Large DHR 186

7.4 Freeform Optics for Uniform Illumination with an Extended Source 191

7.4.1 Algorithm of a Freeform Lens for Uniform Illumination with an Extended Source 194

7.4.2 Design Method of a Freeform Lens for Extended Source Uniform Illumination 195

7.4.3 Freeform Lenses for Direct-Lit BLUs with an Extended Source 198

7.5 Petal-Shaped Freeform Optics for High-System-Efficiency LED BLUs 203

7.5.1 Optical Co-design from the System Level of BLUs 203

7.5.2 Optimization of a High-Efficiency LIDC for BEFs 203

7.5.3 Petal-Shaped Freeform Lenses, and ASLPs for High-Efficiency BLUs 206

7.6 BEF-Adaptive Freeform Optics for High-System-Efficiency LED BLUs 210

7.6.1 Design Concept and Method 210

7.6.2 BEF-Adaptive Lens Design Case 213

References 219

8 Freeform Optics for LED Automotive Headlamps 221

8.1 Introduction 221

8.2 Optical Regulations of Low-Beam and High-Beam Light 221

8.2.1 Low-Beam 221

8.2.2 High-Beam 222

8.2.3 Color Range 222

8.3 Application-Specific LED Packaging for Headlamps 224

8.3.1 Small Étendue 224

8.3.2 High Luminance 225

8.3.3 Strip Shape Emitter with a Sharp Cutoff 226

8.3.4 Small Thermal Resistance of Packaging 226

8.3.5 ASLP Design Case 226

8.3.6 Types of LED Packaging Modules for Headlamps 228

8.4 Freeform Lens for High-Efficiency LED Headlamps 229

8.4.1 Introduction 229

8.4.2 Freeform Lens Design Methods 229

8.4.3 Design Case of a Freeform Lens for Low-Beam and High-Beam 233

8.4.4 Design Case of a Freeform Lens for a Low-Beam Headlamp Module 239

8.5 Freeform Optics Integrated PES for an LED Headlamp 240

8.6 Freeform Optics Integrated MR for an LED Headlamp 245

8.7 LED Headlamps Based on Both PES and MR Reflectors 248

8.8 LED Module Integrated with Low-Beam and High-Beam 252

References 256

9 Freeform Optics for Emerging LED Applications 259

9.1 Introduction 259

9.2 Total Internal Reflection (TIR)-Freeform Lens for an LED Pico-Projector 259

9.2.1 Introduction 259

9.2.2 Problem Statement 261

9.2.3 Integral Freeform Illumination Lens Design Based on an LED’s Light Source 263

9.2.4 Optimization of the Integral Freeform Illumination Lens 269

9.2.5 Tolerance analysis 270

9.2.6 LED Pico-Projector Based on the Designed Freeform Lens 271

9.3 Freeform Lens Array Optical System for an LED Stage Light 273

9.3.1 Design of a One-Dimensional Beam Expander Based on a Freeform Lens Array 275

9.3.2 Design of a Rectangular Beam Expander Based on a Freeform Lens Array 277

9.4 Freeform Optics for a LED Airport Taxiway Light 280

9.4.1 Introduction 280

9.4.2 Requirement Statement 281

9.4.3 Design Method of an Optical System 281

9.4.4 Simulation and Optimization 283

9.4.5 Tolerance Analysis 284

9.4.6 Design of an LED Taxiway Centerline Lamp 285

9.5 Freeform Optics for LED Searchlights 287

9.5.1 Introduction 287

9.5.2 Freeform Lens Design of a Small Divergence Angle 288

9.5.3 Improving Methods and Tolerance Analysis 291

References 295

10 Freeform Optics for LED Lighting with High Spatial Color Uniformity 297

10.1 Introduction 297

10.2 Optical Design Concept 298

10.3 Freeform Lens Integrated LED Module with a High SCU 299

10.3.1 Optical Design, Molding, and Simulation 299

10.3.2 Tolerance Analyses 302

10.3.3 Secondary Freeform Lens for a High SCU 303

10.3.4 Experimental Analyses 304

10.4 TIR-Freeform Lens Integrated LED Module with a High SCU 313

10.4.1 Introduction 313

10.4.2 Design Principle for a High SCU 315

10.4.3 Design Method of the Modified TIR-Freeform Lens 315

10.4.4 Optimization Results and Discussions 318

References 322

Appendix: Codes of Basic Algorithms of Freeform Optics for LED Lighting 325

Index 341

Author Information

Kai Wang, Ph.D.,Wuhan National Laboratory for Optoelectronics, and V.P. for R&D, Guangdong Real Faith Optoelectronic Co., Ltd, Foshan, China.

Sheng Liu, Ph.D.,Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, China, has more than twenty years' experience in LED/MEMS/IC packaging.

Dan Wu, Ph.D., The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.

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