• 제목/요약/키워드: Lens Injection Molding Process

검색결과 61건 처리시간 0.03초

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

  • 박준홍;전언찬;김태호;문순균
    • 한국기계가공학회지
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    • 제7권4호
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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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다수 캐비티의 사출성형품에서 충전의 불균형과 성형품 치수 편차의 교찰 (Investigation of the Filling Unbalance and Dimensional Variations in Multi-Cavity Injection Molded Parts)

  • 강민아;류민영
    • 폴리머
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    • 제32권6호
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    • pp.501-508
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    • 2008
  • 렌즈나 휴대폰 부품 같은 소형 플라스틱 부품들은 일반적으로 다수 캐비티 사출금형에서 성형된다. 이러한 다수 캐비티 금형에서의 사출성형은 캐비티간의 충전 불균형이 일어날 수 있다. 이러한 충전 불균형 현상은 제품의 치수 및 중량의 편차뿐 아니라 제품의 물리적 특성에도 영향을 미친다. 충전 불균형은 무엇보다도 기하학적으로 균형 잡히지 않은 delivery system의 설계에서 기인된다. 하지만 delivery system이 기하학적으로 균형 있게 설계가 되었다 하더라도 충전 불균형 현상은 여전히 발생된다. 이러한 현상은 런너 단면에서의 온도분포에 기인하며 사출성형 공정 중 사출속도에 크게 영향을 받는 것으로 본 연구에서 파악되었다. 즉 충전 불균형은 부적절한 사출 성형 공정에 의해 발생되며 성형 공정 조건 중 사출속도는 충전에 영향을 주는 매우 중요한 요소이다. 본 연구에서는 재료와 사출 속도에 따른 충전 불균형 현상을 실험과 CAE을 통하여 관찰하였다. 사출속도 변화에 따른 충전 불균형 때문에 시편의 치수 및 무게가 불균일함을 확인하였다.

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

  • 황철진;고영배;김종선;윤경환
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2006년도 춘계학술대회 논문집
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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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폰카메라 렌즈모듈 제조시스템을 위한 시뮬레이션 기반의 스케줄러 개발 (Development of Scheduler Based on Simulation for Phone Camera Lens Module Manufacturing System)

  • 김재훈;이승우;이대령;박철순;송준엽;문덕희
    • 한국시뮬레이션학회논문지
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    • 제23권4호
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    • pp.131-142
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    • 2014
  • 휴대폰 카메라의 렌즈 모듈은 경통, 복수의 렌즈, 복수의 스페이서와 한 장의 쉴드로 구성된다. 렌즈 모듈을 생산하기 위한 주요 공정으로는 사출성형공정, 코팅공정 및 조립공정이 있는데, 일반적으로 제조라인에서는 동일한 기능을 가지는 복수의 기계들을 사용하여 생산을 한다. 본 논문에서는 긴급주문, 금형의 파손, 장비의 고장 등으로 인하여 제조현장에서 빈번하게 발생하는 재스케줄링의 문제를 해결하기 위해 시뮬레이션을 기반으로 개발된 스케줄러에 대해 소개한다. 스케줄링 알고리즘은 경험적 Backward-Forward 방법을 사용하였으며, 주문의 납기지연율을 최소화시키는 것이 목표다.

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

  • 황철진;고영배;김종선;윤경환
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2006년도 춘계학술대회 논문집
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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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LED Encapsulation을 위한 스태틱 믹서의 전산 설계 및 유동해석을 이용한 액상 실리콘의 혼합 특성에 대한 연구 (A Study on the Computational Design of Static Mixer and Mixing Characteristics of Liquid Silicon Rubber using Fluidic Analysis for LED Encapsulation)

  • 조용규;하석재;호소;조명우;최종명;홍승민
    • Design & Manufacturing
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    • 제7권1호
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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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연속마이크로렌즈 200μm 적용 7인치 LCD-BLU 금형개발 (A Study on the Fabrication Method of Mold for 7 inch LCD-BLU by continuous microlens 200μm)

  • 김종선;고영배;민인기;유재원;허영무;윤경환;황철진
    • 소성∙가공
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    • 제16권1호
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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.

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

  • 황철진;김종선;민인기;김종덕;윤경환
    • Design & Manufacturing
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    • 제2권5호
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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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50μm급 마이크로렌즈 적용 2인치 휴대폰 LCD-BLU 금형 개발 : 광학패턴의 세장비 영향 (A Study on the Fabrication Method of Mold for 2 inch LCD-BLU by 50μm Microlens : Effect of Different Aspect Ratio)

  • 김종선;고영배;민인기;유재원;허영무;윤경환;황철진
    • 소성∙가공
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    • 제16권1호
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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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    • 제13권1호
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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).