scholarly journals Digitally switchable multi-focal lens using freeform optics

2018 ◽  
Vol 26 (8) ◽  
pp. 11007 ◽  
Author(s):  
Xuan Wang ◽  
Yi Qin ◽  
Hong Hua ◽  
Yun-Han Lee ◽  
Shin-Tson Wu
Keyword(s):  
Freeform Optics

A freeform optics design with limited data for extended LED light sources

2016 ◽  
Vol 63 (21) ◽  
pp. 2151-2158 ◽  
Author(s):  
Zhenfeng Zhuang ◽  
Phil Surman ◽  
Feihong Yu
Keyword(s):  
Light Sources ◽  
Limited Data ◽  
Led Light ◽  
Freeform Optics ◽  
Optics Design

Additive Manufacturing of Freeform Optics for Defense Applications

2021 ◽  
Author(s):  
George M. Williams ◽  
Hooman Akhavan ◽  
Charles Dupuy ◽  
Paul Harmon
Keyword(s):  
Additive Manufacturing ◽  
Freeform Optics

Rapid prototyping of freeform optics for an LED downlighter with a dynamically adjustable beam

2016 ◽  
Vol 48 (7) ◽  
pp. 885-897 ◽  
Author(s):  
E Juntunen ◽  
P Myöhänen ◽  
E Tetri ◽  
O Tapaninen ◽  
J Ojalehto ◽  
...  
Keyword(s):  
Rapid Prototyping ◽  
Freeform Optics

Freeform Optics and Supporting Quadric Method Introduction

2020 ◽  
pp. 119-126
Author(s):  
Roland Winston ◽  
Lun Jiang ◽  
Vladimir Oliker
Keyword(s):  
Freeform Optics

scholarly journals Measurement and Compensation of Tool Contour Error Using White Light Interferometry for Ultra-Precision Diamond Turning of Freeform Surfaces

2020 ◽  
Vol 14 (4) ◽  
pp. 654-664 ◽  
Author(s):  
Kodai Nagayama ◽  
◽  
Jiwang Yan
Keyword(s):  
White Light ◽  
High Efficiency ◽  
Diamond Tool ◽  
Microlens Array ◽  
Diamond Turning ◽  
Contour Error ◽  
Form Accuracy ◽  
Freeform Optics ◽  
Ultra Precision ◽  
Quick Measurement

In ultra-precision diamond turning of freeform optics, it is necessary to obtain submicron-level form accuracy with high efficiency. In this study, we proposed a new method for the quick measurement and compensation of tool contour errors to improve the form accuracy of the workpiece. In this method, the nanometer-scale contour error of a diamond tool is quickly and precisely measured using a white light interferometer and then compensated for, before machining. Results showed that the contour of a diamond tool was measured with an error less than 0.05 μm peak-to-valley (P-V) and the feasibility of error compensation was verified through cutting experiments to create a paraboloid mirror and a microlens array. The form error decreased to 0.2 μm P-V regardless of the contour error of the diamond tools when cutting the paraboloid mirror, and that of the microlens array was reduced to 0.15 μm P-V during a single machining step.

scholarly journals Pseudorandom orbiting stroke for freeform optics postprocessing

2019 ◽  
Vol 58 (09) ◽  
pp. 1 ◽  
Author(s):  
Xiangyu Guo ◽  
Yong Shu ◽  
Geon-Hee Kim ◽  
Michael Palmer ◽  
Heejoo Choi ◽  
...  
Keyword(s):  
Freeform Optics

Diamond Turning Freeform Optics

2007 ◽  
Vol 364-366 ◽  
pp. 1-6
Author(s):  
W. Jiang ◽  
Bill Tse ◽  
Roy Louie ◽  
Frankie Chan
Keyword(s):  
Diamond Turning ◽  
Freeform Surface ◽  
Work Piece ◽  
Freeform Optics ◽  
Milling Method ◽  
Slow Tool Servo ◽  
Optics Industry ◽  
Optics Fabrication ◽  
Five Axis ◽  
Machining Parameter

Freeform optics fabrication has become one of the hottest topics in optics industry in recent years. Although it still remains a challenge, many have tried different ways of manufacturing it. Some have achieved degrees of success. By means of a Nanotech 350-FG five axis diamond turning machine, we too have successfully produced some prototype freeform optics and lens arrays with Slow Tool Servo and Milling method. The produced freeform optics are mainly for automobile LED headlamps and the lens arrays are for LED illumination. In order to produce the freeform optics, we developed our own DT Slow Tool Servo program which is capable of generating a DT program for diamond turning a universal/general 3D freeform surface. Slow Tool Servo technique and Diamond Milling technique were mainly employed to produce these freeform surfaces. The manufacturing process and machining parameter details will be given in the paper. The two main methods we used will be compared and discussed as well. In measuring the freeform surface, a 3D white light interferometer was used to scan and obtain the surface coordinates. The software made by ourselves enabled us to compare the measure results of the work piece with that of the design drawings. The deviation of our finished forms is within 5 um from that of the nominal. The surface quality Rq is about 10 nm. Measuring equipment and methodology will also be discussed in the paper.

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