• Title/Summary/Keyword: Micro Lens Array

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A Study on Rapid Fabrication of Micro Lens Array using 355nm UV Laser Irradiation (355nm UV 레이저를 이용한 마이크로 렌즈 어레이 쾌속 제작에 관한 연구)

  • Je, S.K.;Park, S.H.;Choi, C.K.;Shin, B.S.
    • Transactions of Materials Processing
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    • v.18 no.4
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    • pp.310-316
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    • 2009
  • Micro lens array(MLA) is widely used in information technology(IT) industry fields for various applications such as a projection display, an optical power regulator, a micro mass spectrometer and for medical appliances. Recently, MLA have been fabricated and developed by using a reflow method having the processes of micro etching, electroplating, micro machining and laser local heating. Laser thermal relaxation method is introduced in marking of microdots on the surface of densified glass. In this paper, we have proposed a new direct fabrication process using UV laser local thermal-expansion(UV-LLTE) and investigated the optimal processing conditions of MLA on the surface of negative photo-resist material. We have also studied the 3D shape of the micro lens obtained by UV laser irradiation and the optimal process conditions. And then, we made chrome mold by electroplating. After that, we made MLA using chrome mold by hot embossing processing. Finally, we have measured the opto-physical properties of micro lens and then have also tested the possibility of MLA applications.

Integral imaging system with enhanced depth of field using birefringence lens array

  • Park, Chan-Kyu;Lee, Sang-Shin;Hwang, Yong-Seok
    • 한국정보디스플레이학회:학술대회논문집
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    • 2008.10a
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    • pp.1135-1137
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    • 2008
  • In this paper, it is proposed that the integral imaging technique is applied to reconstruct 3D (three dimensional) objects with enhanced depth of field, computationally and optically. Lens array using birefringence material is adopted to obtain the reconstruction. The elemental images sets are picked up through common micro lens array and utilized to present 3D reconstruction images using adopted lens array.

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Study on Manufacturing Aspheric Lens Array with High NA using Reflow Phenomenon (리플로우 현상을 이용한 고 개구수를 갖는 비구면 렌즈 어레이의 제작에 관한 연구)

  • 김완진;이명복;손진승;박노철;박영필
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.644-647
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    • 2003
  • Resulting from reproducibility and possibility of mass production. many researches to fabricate micro lens array using lithography have been developed. However, it still remains the level of fabricating compensation lens. Therefore, to realize the fabrication of lens having high numerical aperture can be the key technology of ultra slim optical system. Reflow phenomenon have been researched to make lens having high refractive power. And through those researches, the possibility to fabrication of high refractive power lens has been investigated. In this paper, we analyze the effect of many parameters in reflow process to get an aspheric shape with high repeatability. And we make possible to estimate shape error, through we give direct information about decrease in volume of photoresist.

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Fabrication of Mold-insert for Micro-lens Using Electroforming Process (Electroforming 공정을 이용한 마이크로 렌즈용 몰드 인서트의 제작)

  • 이남석;문수동;강신일
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2002.05a
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    • pp.94-97
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    • 2002
  • Micromolding methods are most suitable for mass production of plastic microlens and lens array with low cost. Among the procedures related with micromolding of microlens array, fabrication of mold insect which contains micro cavity of lens shape is the most important stage. In this study, nickel mold inserts for 45 $\mu\textrm{m}$ and 95 $\mu\textrm{m}$ diameters lens way were fabricated using electroforming process. The mother for metal mold inset was made using reflow method. A micro compression molding with polymer powders was used to test the qualities of the metal mold insets. Micro lens profile and surface roughness was measured by interferometric technique and AFM, respectively. The final molded lens replicated the mother well, and had good surface quality.

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Rapid Fabrication of Micro Lens Array by 355nm UV Laser Irradiation (355nm UV 레이저를 이용한 마이크로 렌즈 어레이 쾌속 제작)

  • Je, Soon-Kyu;Park, Kang-Su;Oh, Jae-Yong;Kim, Kwang-Ryul;Park, Sang-Hoo;Go, Cheong-Sang;Shin, Bo-Sung
    • Laser Solutions
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    • v.11 no.2
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    • pp.26-32
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    • 2008
  • Micro lens array (MLA) is widely used in information technology (IT) industry fields, for examples such as a projection display, an optical power regulator, a micro mass spectrometer and for medical appliances. Recently, MLA have been fabricated and developed by using a reflow method, micro etching, electroplating, micromachining and laser local heating. Laser local thermal-expansion (LLTE) technology demonstrates the formation of microdots on the surface of polymer substrate, in this paper. We have also investigated the new direct fabrication method of placing the MLA on the surface of a SU-8 photoresist layer. We have obtained the 3D shape of the micro lens processed by UV laser irradiation and have experimentally verified the optimal process conditions.

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A Basic Study of replication and brightness for micro injection molding with ${\sim}50{\mu}m$ micro-lens pattern mold ($50{\mu}m$ Microlens 패턴 금형의 미세사출성형 전사성과 전광특성 기초연구)

  • Hwang C. J.;Ko Y. B.;Heo Y. M.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2004.10a
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    • pp.280-283
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    • 2004
  • Micro-lens patterned micro-mold fabrication method for Light Guiding Plate(LGP), kernel part of LCD-BLU(Back Light Unit), was presented. Instead of erosion dot pattern for LGP optical design, micro-lens pattern, fabricated by LIGA-reflow process, was applied. Optical pattern design method was also developed not only for negative pattern LGP, but also positive pattern LGP. During injection molding process, experimental study was conducted to improve replication quality and brightness of ${\sim}50um$ micro-lens pattern mold. The effect of mold temperature for the replication quality of micro-lens array was studied.

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Fabrication of Large-area Micro-lens Arrays with Fast Tool Control

  • Noh, Young-Jin;Arai, Yoshikazu;Tano, Makoto;Gao, Wei
    • International Journal of Precision Engineering and Manufacturing
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    • v.9 no.4
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    • pp.32-38
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    • 2008
  • This paper describes a fast tool control (FTC)-based diamond turning process for fabricating large-area high-quality micro-lens arrays. The developed FTC unit has a stroke of $48{\mu}m$ and a resonance frequency of 4.9 kHz. Micro-lens arrays were fabricated using a micro-cutting tool with a nose radius of $50{\mu}m$. The FTC unit was integrated with a force sensor so that the initial position of the micro-cutting tool with respect to the workpiece surface could be detected through monitoring the contacting force. The length and depth of the designed parabolic micro-lens profile were $190{\mu}m$ and $20{\mu}m$, respectively. A micro-lens array was fabricated on a cylinder surface over an area of ${\phi}55 mm{\times}40 mm$.

Design and Development of Asymmetry Glass Array Lens (비축대칭 Glass Array Lens의 설계 및 개발)

  • Park, Soon-Sub;Hwang, Yeon;Lee, Ki-Young;Kim, Geon-Hee;Won, Jong-Ho
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.12
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    • pp.39-46
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    • 2008
  • Asymmetric glass lens core for portable projection optic system was designed and simulated. And it was machined by newly developed non-rotational ultra precision grinding method. With the designed lens data which optimized for multi-collimation, we generated the we core surface data. Mold pressing conditions analyzed by FEM. In the machining process, ground profile errors were compensated based on measured data, minimized feed rate and depth of cut. The deviations of machined core profile were acceptable level for glass mold press. Mold pressed glass array lens was coated with $SiO_2\;and\;Ta_2O_5$ for anti-reflection.