• 제목/요약/키워드: Micro pattern

검색결과 922건 처리시간 0.042초

사출성형시 미세패턴 전사성 차이에 관한 연구 (A study on the micro pattern replication difference in injection molding)

  • 김태훈;유영은;제태진;박영우;노승환;최두선
    • Design & Manufacturing
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    • 제2권4호
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    • pp.48-53
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    • 2008
  • We injection molded a thin type of plate and wedge type of plate with micro prizm patterns on its surface and investigated the fidelity of replication of the micro pattern depending on the process parameter such as mold temperature, melt temperature, injection rate or packing pressure. The size of the $90^{\circ}$ prizm pattern is $50{\mu}m$ and the size of the plate is about $335mm{\times}213mm$ and $400mm{\times}400mm$. The thicknesses are 2.6mm and 0.7mm at each edge of the wedge type of plate and 1mm at each edge of the thin type of plate. The fidelity of the replication turned out quite different according to the process parameters and location of the patterns on the plate. We measured the cavity pressure and temperature in real-time during the molding to analyze the effect of the local melt pressure and temperature on the micro pattern replication.

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마이크로 분말사출성형에서 바인더 물성이 피드스탁 및 성형공정에 미치는 영향에 관한 연구 (A study on the effect of binder properties on feedstock and micro powder injection molding process)

  • 이원식;김용대
    • Design & Manufacturing
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    • 제11권3호
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    • pp.1-7
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    • 2017
  • The fabrication process of micro pattern structure with high precision and high aspect ratio using powder injection molding (PIM) is developed. In the PIM process, the metal powder is mixed with the binder systems and the mixture is injected into the metal mold. The injection molded green parts are debinded and sintered to reach final shape and properties. In this method, the optimization of physical properties such as fluidity and strength of the binder system is essential for perfect filling the high aspect ratio micro-pattern. For this purpose, the correlation between the properties of the binder system and feedstock and ${\mu}-PIM$ process was investigated, and a binder system with low viscosity at low temperature(about $110^{\circ}C$) and high strength after cooling was investigated and applied. Employing this process, high precision parts with line type micro pattern structure which has pattern size $160{\mu}m$ and aspect ratio more than 2 can be manufactured.

다층광학필름에서 마이크로패턴 삽입을 통한 색 조정 연구 (Color Adjustment Study by Micro-Pattern Embedding in Optical Multilayer Thin Film)

  • 김민;우주연;윤준호;황보창권;한창수
    • 한국정밀공학회지
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    • 제33권5호
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    • pp.409-417
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    • 2016
  • It is well known that Morpho butterflies show distinctive, brilliant and iridescent colors and have micro-nano scale structures, instead of dyes and pigments, on their wings. This structural coloration is regarded as a novel technique to express color with a long lifetime, ease and precise tenability. Here, we studied optical multilayer thin films with thickness of several tens of nm ($TiO_2$ and $SiO_2$) and lens-shape micro-patterns. Fabrication and characterization of the multilayer stacking structure and the micro-pattern structure were performed and the films were analyzed via several optical measuring techniques. Finally, we discussed how the micro-pattern structure could enhance independence with color changes according to the viewing angle.

대면적 미세패턴 사출성형에서의 전사 특성 실험 (A study on the micro pattern replication properties of large area in injection molding)

  • 김태훈;유영은;제태진;김창완;박영우;최두선
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2007년도 춘계학술대회 논문집
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    • pp.205-208
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    • 2007
  • We injection molded a thin plate with micro prism patterns on its surface and investigated the fidelity of replication of the micro pattern depending on the process parameter such as mold temperature, injection rate or packing pressure. The size of the $90^{\circ}$ prism pattern is $50{\mu}m$ and the size of the plate is $400mm{\times}400mm$. The thickness is 1mm. The fidelity of the replication turned out quite different according to the process parameters and location of the patterns of the plate. We measured the cavity pressure and temperature in real-time during the molding to analyze the effect of the local melt pressure and temperature on the micro pattern replication.

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반응표면법을 이용한 초음파 임프린팅 공정의 최적화 (Optimization of Ultrasonic Imprinting Using the Response Surface Method)

  • 정우신;조영학;박근
    • 소성∙가공
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    • 제22권1호
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    • pp.36-41
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    • 2013
  • The present study examines the micro-pattern replication on a plastic film using ultrasonic imprinting. Ultrasonic imprinting uses ultrasonic waves to generate repetitive microscale deformation in the polymer film. The resulting deformation heat on the surface of the film causes the surface region to soften sufficiently so that a replication of the micro-pattern can be obtained. To successfully replicate the micro-pattern on a large area of polymer film, a high replication ratio is needed as well as good uniformity over the entire region. In this study, a horn design is investigated by finite element analysis and is optimized through a response surface analysis. In the ultrasonic imprinting experiments, the response surface method was also used to determine the optimal processing conditions for better replication characteristics.

프리즘 패턴의 기계적 절삭 가공 (Mechanical Machining of Prism pattern)

  • 유영은;홍성민;제태진;최두선
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2005년도 금형가공,미세가공,플라스틱가공 공동 심포지엄
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    • pp.110-113
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    • 2005
  • In recent, various shapes of pattern in micron or nano scale are adapted in many applications due to their good mechanical or optical properties. Light guide panel (LGP) of the LCD is one of important applications for micro pattern and micro prism shape is one of the typical patterns. Many applications have the patterns on their surface and the size of the pattern keep decreasing down to the order of micron or even under micron. On the other hand, the area to be patterned keeps enlarging. These two trends in patterned products require tooling micro patterns on large surface, which has still many technical problems to be solved mainly due to pattern size and the tooling area. In this study, we fabricate prism shape of patterns using diamond cutting tool on some metal core and plastic core like PMMA Some of cutting conditions are investigated including cutting force, cutting depth and speed for different core materials.

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대면적 미세 가공공정 원천기술 개발 (Core Technology Development for Micro Machining Process on Large Surface)

  • 이석우;이동윤;송기형;강호철;김수진
    • 한국정밀공학회지
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    • 제28권7호
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    • pp.769-776
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    • 2011
  • In order to cope with the requirements of smaller patterns, larger surfaces and lower costs in the fields of displays, optics and energy, greater attentions is now being paid to the development of micro-pattern machining technology. Compared with flat molds, roll molds have the advantages of short delivery, ease of manufacturing larger surfaces, and continuous molding. This paper presents the state-of-the-art of the micro pattern machining technology on the roll molds and introduces some research results on the machining process technology. The copper and nickel-phosphorous-alloy plating process, machining process technology for uniform micro patterns. micro cutting simulation and the real time monitoring system for micro machining are summarized. The developed technologies have led the complete localization of the prism sheets and will be applied to the direct forming process with succeeding research & development.

정전기력 잉크젯 프린팅을 이용한 마이크로 패터닝에 관한 연구 (A Study for Micro-patterning using an Electrostatic Inkjet)

  • 김준우;최경현;김동수
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2008년도 추계학술대회A
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    • pp.1103-1106
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    • 2008
  • For the current display process, the innovative micro pattern fabrication process using semiconductor process should be developed, which requires the expensive equipment, the limited process environment and the expensive optic-sensitive material. The effort of process innovation during past several years ends up the limit of cost reduction. The existing ink jet technologies such as a thermal bubble ink jet printing and a piezo ink jet printing are required to shorten the nozzle diameter in order to apply to the micro pattern fabrication. In this paper, as one way to cope these problems the micro pattern equipment based on the electrostatic ink jet has been developed and carried out some experiments.

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가스 용해를 고려한 금형내압제어 사출성형공정의 마이크로패턴 충전 해석 (Numerical Analysis of Micro-pattern Filling with Gas Dissolution by Injection Molding Process)

  • 박성호;유형민;이우일
    • 한국기계가공학회지
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    • 제13권4호
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    • pp.21-27
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    • 2014
  • The injection molding process has several advantages enabling it to produce large quantities of molded plastic products using a repetitive process. In recent years, it has been necessary to develop an injection molding process with micro/nano-sized patterns for application to the semiconductor industry and to the bio/nano manufacturing industry. In this study, we apply gas pressure to the inside of a mold and consider the gas dissolution phenomenon for a resin filling into a micro pattern with a line structure. Using numerical analysis, we calculate the filling ratio with respect to time for various internal gas pressures and various aspect ratios of the micro-patterns.