• Title/Summary/Keyword: Glass Thermal Deformation

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Molding and Evaluation of Ultra-Precision Chalcogenide-Glass Lens for Thermal Imaging Camera Using Thermal Deformation Compensation (열변형 보정을 통한 열화상카메라용 초정밀 칼코지나이드 유리렌즈 몰드성형 및 특성 평가)

  • Cha, Du Hwan;Kim, Jeong-Ho;Kim, Hye-Jeong
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.27 no.2
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    • pp.91-96
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    • 2014
  • Aspheric lenses used in the thermal imaging are typically fabricated using expensive single-crystal materials (Ge and ZnS, etc.) by the costly single point diamond turning (SPDT) process. As a potential solution to reduce cost, compression molding method using chalcogenide glass has been attracted to fabricate IR optic. Thermal deformation of a molded lens should be compensated to fabricate chalcogenide aspheric lens with form accuracy of the submicron-order. The thermal deformation phenomenon of molded lens was analyzed ant then compensation using mold iteration process is followed to fabricate the high accuracy optic. Consequently, it is obvious that compensation of thermal deformation is critical and useful enough to be adopted to fabricate the lens by molding method.

A study on the thermal deformation of 3 cavity GMP mold for glass lens (GMP 공정용 3 cavity 유리 렌즈 금형의 열변형에 관한 연구)

  • Chang, Sung-Ho;Heo, Young-Moo;Shin, Gwang-Ho;Jung, Tae-Sung
    • Design & Manufacturing
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    • v.2 no.6
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    • pp.38-42
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    • 2008
  • Recently, the demands of digital camera and miniature camera module for mobile-phone is increased significantly. Lenses which is the core component of optical products are made by the injection molding(plastic lens) or GMP(glass lens). Plastic lens is not enough to improve the resolution and performance of optic parts. Therefore, the requirement of glass lens is increased because it is possible to ensure the high performance and resolution. In this paper, the thermal stress analysis of 3 cavity GMP mold for molding glass lens was performed for estimating the thermal stress and amount of deformation. Finally, the modification plan based on the analysis results was deducted.

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TRIZ-based Improvement of Glass Thermal Deformation in OLED Deposition Process (트리즈 기반 OLED 증착 공정의 글래스 열 변형 개선)

  • Lee, Woo-Sung;Choi, Jin Young
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.40 no.1
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    • pp.114-123
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    • 2017
  • The global small and mid-sized display market is changing from thin film transistor-liquid crystal display to organic light emitting diode (OLED). Reflecting these market conditions, the domestic and overseas display panel industry is making great effort to innovate OLED technology and incease productivity. However, current OLED production technology has not been able to satisfy the quality requirement levels by customers, as the market demand for OLED is becoming more and more diversified. In addition, as OLED panel production technology levels to satisfy customers' requirement become higher, product quality problems are persistently generated in OLED deposition process. These problems not only decrease the production yield but also cause a second problem of deteriorating productivity. Based on these observations, in this study, we suggest TRIZ-based improvement of defects caused by glass pixel position deformation, which is one of quality deterioration problems in small and medium OLED deposition process. Specifically, we derive various factors affecting the glass pixel position shift by using cause and effect diagram and identify radical reasons by using XY-matrix. As a result, it is confirmed that glass heat distortion due to the high temperature of the OLED deposition process is the most influential factor in the glass pixel position shift. In order to solve the identified factors, we analyzed the cause and mechanism of glass thermal deformation. We suggest an efficient method to minimize glass thermal deformation by applying the improvement plan of facilities using contradiction matrix in TRIZ. We show that the suggested method can decrease the glass temperature change by about 23% through an experiment.

Form Error Compensation of Aspheric lens considering Thermal Deformation on Glass Molding Press ( I ) (Glass Lens 가압성형의 열 변형에 의한 비구면 Lens 형상보정 ( I ))

  • Lee, Hak-Suk;Lee, Dong-Kil;Park, Jong-Rak;Kim, Hye-Jung;Kim, Jung-Ho
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2008.11a
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    • pp.354-354
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    • 2008
  • Recently, due to the tremendous growth of media technology, demands of the aspheric glass lens which is a high-performance and miniaturized is gradually increasing. Generally, the aspheric glass lens is manufactured by GMP(Grass Molding Press) method using WC(tungsten carbide) mold core. In this study, the thermal deformation which occurs in the cooling step of GMP was considered, and it was compensated the form of mold core. The lens which was molded by compensated mold core was satisfied that can be applied to the actual specifications.

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A Study on the Thermal Stresses of the Glass Lens Mold Using in Progressive GMP Process (순차이송 GMP 방식용 유리렌즈 금형의 열응력에 관한 연구)

  • Chang, S.H.;Lee, Y.M.;Shin, G.H.;Yoon, G.S.;Jung, W.C.;Jung, T.S.;Heo, Y.M.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2007.10a
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    • pp.289-292
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    • 2007
  • To prevent the damage of glass lens molds and deterioration of glass lenses using in progressive GMP process, a thermal stress and a deformation of the glass lens molds at forming temperature should be considered in the design step. In this study, as a fundamental study to develop a multi cavity mold used in an aspheric glass lens molding, a heat transfer and a thermal stress analysis were carried out for the case of one cavity glass lens mold used in progressive GMP process. Finally, using analysis results, we estimated the thermal stress in a glass lens mold and predicted a modified height of guide ring that determines the forming height of a glass lens.

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Finite Element Analysis of Laser Class Bonding Process (레이저 유리 접합 공정의 유한요소해석)

  • Hong, Seok-Kwan;Kang, Jeong-Jin;Byun, Cheol-Woong
    • Laser Solutions
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    • v.11 no.3
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    • pp.10-15
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    • 2008
  • This study is aimed to analyse the laser glass bonding process numerically. Due to the viscoelastic behaviour of glass, the extremely large deformation of the frit seal is resulted continuously over the transition temperature, so that the thermal boundary condition be changed in the entire calculation process. The commercial FEM algorithm is restrictively able to remesh the large geometrical boundary shape and to adapt the boundary conditions simultaneously. According to our manual adaptation of increasing the laser line intensity to 700 mW/mm, it is possible to estimate the thermal glass bonding process under the fracture stress in principle. But it should be studied further in the case of high laser line intensity.

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Mechanical and thermal properties of Homo-PP/GF/CaCO3 hybrid nanocomposites

  • Parhizkar, Mehran;Shelesh-Nezhad, Karim;Rezaei, Abbas
    • Advances in materials Research
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    • v.5 no.2
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    • pp.121-130
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    • 2016
  • In an attempt to reach a balance of performances in homo-polypropylene based system, the effects of single and hybrid reinforcements inclusions comprising calcium carbonate nanoparticles (2, 4 and 6 phc) and glass fibers (10 wt.%) on the mechanical and thermal properties were investigated. Different samples were prepared by employing twin-screw extruder and injection molding machine. In morphological studies, the uniform distribution of glass fibers in PP matrix, relative adhesion between glass fibers and polymer, and existence of nanoparticles in polymer matrix were observed. $PP/CaCO_3$ (6 phc) as compared to pure PP and PP/GF had superior tensile and flexural strengths, impact resistance and deformation temperature under load (DTUL). $PP/GF/CaCO_3$ (6 phc) composite displayed comparable tensile and flexural strengths and impact resistance to neat PP, while its tensile and flexural moduli and deformation temperature under load (DTUL) were 436%, 99% and $26^{\circ}C$greater respectively. The maximum impact resistance was observed in $PP/CaCO_3$(6 phc). The highest DTUL was perceived in PP hybrid nanocomposite containing 10 wt.% glass fiber and 4 phc $CaCO_3$ nanoparticle.

A Study on thermal deformation behavior of laminates composed of different material layers. (다종 재료층으로 구성된 적층판의 열변형 거동 연구)

  • 정재한;구남서;박훈철;윤광준
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2000.11a
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    • pp.54-57
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    • 2000
  • Thermal deformation behavior has been investigated for unsymmetric laminates composed of various kinds of material layers, such as stainless steel, aluminum, carbon/epoxy or glass/epoxy. The thermal deformations of unsymmetric laminates were predicted using the classical lamination theory and compared with those obtained from experimental measurement. In the case of unsymmetric laminate composed of stainless steel and aluminum layer, the experimental results were agreed well with the values predicted. But in the case of unsymmetric laminate composed of fiber composite layers, there was a considerable difference of thermal deformation between the prediction and experimental measurement, which may be from the change of material properties of fiber composite layers for temperature variation.

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Thermal Analysis on Glass Backplane of OLED Displays During Joule Induced Crystallization Process (OLED 디스플레이 제작을 위한 Joule 유도 결정화 공정에서의 유리기판에 대한 열해석)

  • Kim, Dong-Hyun;Park, Seung-Ho;Hong, Won-Eui;Chung, Jang-Kyun;Ro, Jae-Sang;Lee, Seung-Hyuk
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.33 no.10
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    • pp.797-802
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    • 2009
  • Large area crystallization of amorphous silicon thin-films on glass substrates is one of key technologies in manufacturing flat displays. Among various crystallization technologies, the Joule induced crystallization (JIC) is considered as the highly promising one in the OLED fabrication industries, since the amorphous silicon films on the glass can be crystallized within tens of microseconds, minimizing the thermally and structurally harmful influence on the glass. In the JIC process the metallic layers can be utilized to heat up the amorphous silicon thin films beyond the melting temperatures of silicon and can be fabricated as electrodes in OLED devices during the subsequent processes. This numerical study investigates the heating mechanisms during the JIC process and estimates the deformation of the glass substrate. Based on the thermal analysis, we can understand the temporal and spatial temperature fields of the backplane and its warping phenomena.

A Study on Thermal Deformation Compensation in the Molding of Aspheric Glass Lenses (비구면 유리렌즈 열변형 보정에 관한 연구)

  • Lee, Dong-Kil;Kim, Hyun-Uk;Cha, Du-Hwan;Lee, Hak-Suk;Kim, Hye-Jeong;Kim, Jeong-Ho
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.5
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    • pp.22-26
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    • 2010
  • Recently, due to the tremendous growth of media technology, demands of the aspheric glass lens which is a high-performance and miniaturized increase gradually. Generally, the aspheric glass lens is manufactured by Glass Molding Press (GMP) method using tungsten carbide (WC) mold core. In this study, the thermal deformation which was occurred by GMP process was analyzed and applied it to compensate the aspheric glass lens. The compensated lens was satisfied that can be applied to the actual specifications.