Home

Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 30 , No. 3

[Paper List] [Go to Volume List]


[ Papers ]
Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 30, No. 3, pp. 203-211
Abbreviation: J. Korean Soc. Manuf. Technol. Eng.
ISSN: 2508-5107 (Online)
Print publication date 15 Jun 2021
Received 06 Apr 2021 Revised 04 May 2021 Accepted 06 May 2021
DOI: https://doi.org/10.7735/ksmte.2021.30.3.203
래스터 밀링을 이용한 마이크로렌즈 어레이 금형 가공
김영복^a^{, b} ; 이의삼^a ; 한승헌^a ; 이동길^a ; 이준기^b^{, *}


Mold Machining of Microlens Array Using the Raster Milling Method
Young Bok Kim^a^{, b} ; Wee Sam Lee^a ; Seung Heon Han^a ; Dong Kil Lee^a ; June Key Lee^b^{, *}
aIntelligent Optical Module Research Center, Korea Photonics Technology Institute
bDepartment of Materials Science & Engineering, Chonnam National University
Correspondence to : ^*Tel.: +82-62-530-0308 E-mail address: junekey@jnu.ac.kr (June Key Lee)



Funding Information ▼ Ministry of Trade, Industry and Energy Korea Evaluation Institute of Industrial Technology 20010775 Chonnam National University 2021-1446

Abstract

Machining experiments were conducted to improve the surface morphology of a microlens array using the raster milling method. Three types of raster milling methods were investigated in this study: parallel, tilted, and single-point raster milling. Further, the characteristics of the machined surfaces were analyzed. In parallel raster milling, hump formation on the machined surface was promoted by the tool’s run-out deviation. In tilted raster milling, tool marks occurred on the machined surfaces owing to tool wear. In single-point raster milling, wherein the tool axis rotated according to the lens curvature during machining, the form accuracy of peak-to-valley was confirmed to improve from 0.46 to 0.07 μm. Therefore, single-point raster milling was validated as a highly robust machining method because the surface morphology was rarely affected by tool errors.


Keywords: Micro lens array, Raster milling, Ultra precision diamond machine, Diamond ball endmill, Surface roughness, Optical lens

Acknowledgments

이 연구는 산업통상자원부 및 산업기술평가관리원(KEIT)의 연구비 지원에 의한 연구임(고온성형용 GMP 장비 및 제조기술 개발, 20010775).

이 논문은 전남대학교 학술연구비(과제번호: 2021-1446)의 지원에 의하여 연구되었음.

References


1.	Lin, J., Kan, Y., Jing, X., Lu, M., 2018, Design and Fabrication of a Three-dimensional Artificial Compound Eye using Two-photon Polymerization, Micromachines, 9:7 336
2.	Yuan, W., Li, L. H., Lee, W. B., Chan, C. Y., 2018, Fabrication of Microlens Array and its Application: A Review, Chin. J. Mech. Eng., 31:16 1-9
3.	Venkatesh, V., Swain, N., Srinivas, G., Kumar, P., Barshilia, H. C., 2017, Review on the Machining Characteristics and Research Prospects of Conventional Microscale Machining Operations, Mater. Manuf. Process., 32:3 235-268
4.	Fang, F. Z., Zhang, X. D., Weckenmann, A., Zhang, G. X., Evans, C., 2013, Manufacturing and Measurement of Freeform Optics, CIRP Ann-Manuf. Technol., 62:2 823-846
5.	Lee, D. H., Yoon, J. C., Koo, J. Y., Kim, J. S., Jung, Y. H., 2019, Microburr Condition Monitoring in Micromilling of Al6061-T6, Journal of the Korean Society of Manufacturing Technology Engineers, 28:6 335-342
6.	Davis, G. E., Roblee, J. W., Hedges, A. R., 2009, Comparison of Freeform Manufacturing Techniques in the Production of Monolithic Lens Arrays, Proc. SPIE 7426, Optical Manufacturing and Testing VIII, 742605.
7.	Zhang, L., Zhou, W., Naples, N. J., Yi, A. Y., 2018, Fabrication of an Infrared Shack–Hartmann Sensor by Combining High-speed Single-point Diamond Milling and Precision Compression Molding Processes, Appl. Opt., 57:13 3598-3605
8.	Gao, P., Liang, Z., Wang, X., Zhou, T., Xie, J., Li, S., Shen, W., 2018, Fabrication of a Micro-lens Array Mold by Micro Ball End-milling and its Hot Embossing, Micromachines, 9:3 96
9.	Kim, H. S., Lim, E. S., Kim, K. H., 2020, Finite Element Analysis and Fabrication of an Ultrasonic Milling System, Journal of the Korean Society of Manufacturing Technology Engineers, 29:5 353-360
*10.*	Kim, Y. B., Park, J., Lee, W. S., Lee, J. K., 2021, Fabrication of Microlens Array by the Tilted Milling Method to Improve the Surface Morphology, Mater. Manuf. Process., Online Published
*11.*	Kim, Y. B., Hwang, Y., An, J. H., Kim, J. H., Kim, H. J., Kim, D. S., 2015, Improvement in Surface Roughness by Multi Point B Axis Control Method in Diamond Turning Machine, J. Korean Soc. Precis. Eng., 32:11 983-988

Young Bok Kim

Researcher in the Intelligent Optical Module Research Center, Korea Photonics Technology Institute.His research interest is ultra-precision machining.

E-mail: ybkim@kopti.re.kr

Wee Sam Lee

Researcher in the Intelligent Optical Module Research Center, Korea Photonics Technology Institute.His research interest is optical lens design.

E-mail: wslee@kopti.re.kr

Seung Heon Han

Researcher in the Intelligent Optical Module Research Center, Korea Photonics Technology Institute.His research interest is camera module system.

E-mail: shawnhan@kopti.re.kr

Dong Kil Lee

Researcher in the Intelligent Optical Module Research Center, Korea Photonics Technology Institute.His research interest is the fabrication of optical lenses.

E-mail: dklee@kopti.re.kr

June Key Lee

Professor in the Department of Materials & Engineering, Chonnam National University.His research interest includes Material and Engineering.

E-mail: junekey@jnu.ac.kr