• Title/Summary/Keyword: Lens Injection Molding Process

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Development of Die Technology of Mobile Phone Camera Module (모바일 폰 카메라 모듈 금형기술 개발)

  • Park, Joon-Hong;Jeon, Eon-Chan;Kim, Tae-Ho;Moon, Soon-Kyun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.7 no.4
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    • pp.17-23
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    • 2008
  • Development of die technology for holder and barrel dies is necessary according to minimization of lens assembly, image sensor, and connectors. In these cases, there are two technical problems arising from die design. One is determination of knock-out pin location in die set. Minimization of lens assembly size make it difficult to obtain ejecting space. The other is whether or not high-precision die technology is possible to reduce torque variation when holer and barrel products is assembled. In this study, multi-cavity die set was developed taking advantage of gear-driven ejecting method. In the developed technology, die manufacturing technology was guaranteed with a high-precision level.

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Investigation of the Filling Unbalance and Dimensional Variations in Multi-Cavity Injection Molded Parts (다수 캐비티의 사출성형품에서 충전의 불균형과 성형품 치수 편차의 교찰)

  • Kang, Min-A;Lyu, Min-Young
    • Polymer(Korea)
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    • v.32 no.6
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    • pp.501-508
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    • 2008
  • Small injection molded articles such as lens and mobile product parts are usually molded in multi-cavity mold. The problem occurring in multi-cavity molding is flow unbalance among the cavities. The flow unbalance affects the dimensions and physical properties of molded articles. First of all, the origin of flow unbalance is geometrical unbalance of the delivery system. However, even the geometry of the delivery system is well balanced, cavity unbalance occurs. This comes from the temperature distributions in the cross-section of runner. Temperature distribution depends upon injection speed because heat generation near runner wall is high at high injection speed. Among the operational conditions, injection speed is the most significant process variable affecting the filling unbalances in multi-cavity injection molding. In this study, experimental study of flow unbalance has been conducted for various injection speeds and materials. Also, the filling unbalances were compared with CAE results. The dimensions and weights of multi-cavity molded parts were examined. The results showed that the filling unbalances vary according to the injection speeds and resins. Subsequently, the unbalanced filling and pressure distribution in the multi-cavity affect the dimensions and physical states of molded parts.

A Study on the Effect of Optical Characteristics in 2 inch LCD-BLU by Aspect Ratio of Optical Pattern : I. Optical Analysis and Design (휴대폰용 2인치 LCD-BLU의 광특성에 미치는 광학패턴 세장비의 영향 연구 : I. 광학 해석 및 설계)

  • Hwang, C.J.;Ko, Y.B.;Kim, J.S.;Yoon, K.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2006.05a
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    • pp.239-242
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    • 2006
  • LCD-BLU (Liquid Crystal Display - Back Light Unit) is one of kernel parts of LCD unit and it consists of several optical sheets(such as prism, diffuser and protector sheets), LGP (Light Guiding Plate), light source (CCFL or LED) and mold frame. The LGP of LCD-BLU is usually manufactured by forming numerous dots with $50{\sim}200$ um in diameter on it by etching process. But the surface of the etched dots of LGP is very rough due to the characteristics of the etching process during the mold fabrication, so that its light loss is high along with the dispersion of light into the surface. Accordingly, there is a limit in raising the luminance of LCD-BLU. In order to overcome the limit of current etched dot patterned LGP, optical pattern design with 50um micro-lens was applied in the present study. The micro-lens pattern fabricated by modified LiGA with thermal reflow process was applied to the optical design of LGP. The attention was paid to the effects of different aspect ratio (i.e. $0.2{\sim}0.5$) of optical pattern conditions to the brightness distribution of BLU with micro-lens patterned LGP. Finally, high aspect ratio micro-lens patterned LGP showed superior results to the one made by low aspect ratio in average luminance.

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Development of Scheduler Based on Simulation for Phone Camera Lens Module Manufacturing System (폰카메라 렌즈모듈 제조시스템을 위한 시뮬레이션 기반의 스케줄러 개발)

  • Kim, Jae Hoon;Lee, Seung Woo;Lee, Dae Ryoung;Park, Chul Soon;Song, Jun Yeob;Moon, Dug Hee
    • Journal of the Korea Society for Simulation
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    • v.23 no.4
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    • pp.131-142
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    • 2014
  • Phone camera lens module is assembled with a barrel, multiple lenses, multiple spacers and a shield. The major processes of manufacturing system are injection molding, coating and assembly processes, and each process has multiple machines. In this paper, we introduce a scheduler based on simulation model which can be used for frequent rescheduling problem caused by urgent orders, breaking down of molds and failures of machines. The scheduling algorithm uses heuristic Backward-Forward method, and the objective is to minimize the number of tardy orders.

A Study on the Effect of Optical Characteristic in 2 inch LCD-BLU by Negative and Positive Optical Pattern :I. Optical Analysis and Design (휴대폰용 2 인치 LCD-BLU의 광특성에 미치는 음각 및 양각 광학패턴의 영향 연구 :I. 광학 해석 및 설계)

  • Hwang C.J.;Ko Y.B.;Kim J.S.;Yoon K.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.75-76
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    • 2006
  • LCD-BLU (Liquid Crystal Display - Back Light Unit) is one of kernel parts of LCD unit and it consists of several optical sheets(such as prism, diffuser and protector sheets), LCP (Light Guide Plate), light source (CCFL or LED) and mold frame. The LGP of LCD-BLU is usually manufactured by forming numerous dots with $50{\sim}200{\mu}m$ in diameter on it by erosion method. But the surface of the erosion dots of LGP is very rough due to the characteristics of the erosion process during the mold fabrication, so that its light loss is high along with the dispersion of light into the surface. Accordingly, there is a limit in raising the luminance of LCD-BLU. In order to overcome the limit of current dot patterned LGP, optical pattern design with $50{\mu}m$ micro-lens was applied in the present study. Especially, the negative and positive micro-lens pattern fabricated by modified LiGA with thermal reflow process was applied to the optical design of LGP. The attention was paid to the effects of different pattern conditions to the brightness distribution of BLU with micro-lens patterned LGP. Finally, negative micro-lens patterned LGP showed superior results to the one made by positive in average luminance.

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A Study on the Computational Design of Static Mixer and Mixing Characteristics of Liquid Silicon Rubber using Fluidic Analysis for LED Encapsulation (LED Encapsulation을 위한 스태틱 믹서의 전산 설계 및 유동해석을 이용한 액상 실리콘의 혼합 특성에 대한 연구)

  • Cho, Yong-Kyu;Ha, Seok-Jae;Huxiao, Huxiao;Cho, Myeong-Woo;Choi, Jong Myeong;Hong, Seung-Min
    • Design & Manufacturing
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    • v.7 no.1
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    • pp.55-59
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    • 2013
  • A Light Emitting Diode(LED) is a semiconductor device which converts electricity into light. LEDs are widely used in a field of illumination, LCD(Liquid Crystal Display) backlight, mobile signals because they have several merits, such as low power consumption, long lifetime, high brightness, fast response, environment friendly. In general, LEDs production does die bonding and wire bonding on board, and do silicon and phosphor dispensing to protect LED chip and improve brightness. Then lens molding process is performed using mixed liquid silicon rubber(LSR) by resin and hardener. A mixture of resin and hardener affect the optical characteristics of the LED lens. In this paper, computational design of static mixer was performed for mixing of liquid silicon. To evaluate characteristic of mixing efficiency, finite element model of static mixer was generated, and fluidic analysis was performed according to length of mixing element. Finally, optimal condition of length of mixing element was applied to static mixer from result of fluidic analysis.

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A Study on the Fabrication Method of Mold for 7 inch LCD-BLU by continuous microlens 200μm (연속마이크로렌즈 200μm 적용 7인치 LCD-BLU 금형개발)

  • Kim, J.S.;Ko, Y.B.;Min, I.K.;Yu, J.W.;Heo, Y.M.;Yoon, K.H.;Hwang, C.J.
    • Transactions of Materials Processing
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    • v.16 no.1 s.91
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    • pp.42-47
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    • 2007
  • LCD-BLU is one of kernel parts of LCD and it consists of several optical sheets: LGP, light source and mold frame. The LGP of LCD-BLU is usually manufactured by etching process and forming numerous dots with $50\sim300{\mu}m$ diameter on the surface. But the surface of the etched dots of LGP is very rough due to the characteristics of the etching process during the mold fabrication, so that its light loss is high along with the dispersion of light into the surface. Accordingly, there is a limit in raising the luminance of LCD-BLU. In order to overcome the limit of current etched dot patterned LGP, optical pattern with continuous microlens was designed using optical simulation CAE. Also, a mold with continuous micro-lens was fabricated by UV-LiGA reflow process and applied to 7 inch size of navigator LCD-BLU in the present study.

Study on the gate cutting of light guiding plate for mobile using quenching element (박형 도광판의 음각, 양각 마이크로 패턴 성형성에 관한 연구)

  • Hwang, Chul-Jin;Kim, Jong-Sun;Min, In-Gi;Kim, Jong-Dug;Yoon, Kyung-Hwan
    • Design & Manufacturing
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    • v.2 no.5
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    • pp.1-4
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    • 2008
  • LCD-BLU (Liquid Crystal Display - Back Light Unit) is one of kernel parts of LCD unit and it consists of several optical sheets(such as prism, diffuser and protector sheets), LCP (Light Guide Plate), light source (CCFL or LED) and mold frame. The LGP of LCD-BLU is usually manufactured by forming numerous dots with $50-200{\mu}m$ in diameter on it by erosion method. But the surface of the erosion dots of LGP is very rough due to the characteristics of the erosion process during the mold fabrication, so that its light loss is high along with the dispersion of light into the surface. Accordingly, there is a limit in raising the luminance of LCD-BLU. Especially, the negative and positive micro-lens pattern fabricated by modified LiGA with thermal reflow process was applied to the optical design of LGP.

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A Study on the Fabrication Method of Mold for 2 inch LCD-BLU by 50μm Microlens : Effect of Different Aspect Ratio (50μm급 마이크로렌즈 적용 2인치 휴대폰 LCD-BLU 금형 개발 : 광학패턴의 세장비 영향)

  • Kim, J.S.;Ko, Y.B.;Min, I.K.;Yu, J.W.;Heo, Y.M.;Yoon, K.H.;Hwang, C.J.
    • Transactions of Materials Processing
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    • v.16 no.1 s.91
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    • pp.48-53
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    • 2007
  • LCD-BLU(Liquid Crystal Display - Back Light Unit) consists of several optical sheets: LGP(Light Guiding Plate), light source and mold frame. The LGP of LCD-BLU is usually manufactured by etching process and forming numerous dots with $50{\mu}m$ in diameter on the surface. But the surface roughness of LGP with etched dots is very high, so there is much loss of light. In order to overcome the limit of current etched dot patterned LGP, optical pattern design with microlens of $50{\mu}m$ diameter was applied in the present study. The microlens pattern fabricated by modified LiGA with thermal reflow process was applied to the optical design of LGP and optical simulation was carried out to know tendency of microlens patterned LGP simultaneously. The attention was paid to the effects of different aspect ratio(i.e. $0.2\sim0.5$) of optical pattern conditions to the brightness distribution of BLU with microlens patterned LGP. Finally, high aspect ratio microlens patterned LGP showed superior results to the one made by low aspect ratio in average luminance.

Four-beam Interference Optical System for Laser Micro- structuring Using Picosecond Laser

  • Noh, Ji-Whan;Lee, Jae-Hoon;Shin, Dong-Sig;Sohn, Hyon-Kee;Suh, Jeong;Oh, Jeong-Seok
    • Journal of the Optical Society of Korea
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    • v.13 no.1
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    • pp.75-79
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    • 2009
  • A four beam interference optical system for laser micro structuring using a pulse laser was demonstrated. The four beam interference optical system using a pulse laser(picosecond laser) can fabricate micro structure on mold material(NAK80) directly. Micro structure on the polymer can be reproduced economically by injection molding of the micro structure on the mold material. The four beam interference optical system was composed by the DOE(Diffractive Optical Element) and two lenses. The laser intensity distribution of four beam interference was explained by an interference optics point of view and by the image optics point of view. We revealed that both views showed the same result. The laser power distribution of a $1{\mu}m$ peak pattern was made by the four beam interference optical system and measured by the objective lens and CCD. A $1{\mu}m$ pitch dot pattern on the mold material was fabricated and measured by SEM(Scanning Electron Microscopy).