• 제목/요약/키워드: laser writing

검색결과 86건 처리시간 0.03초

레이저 가열을 이용한 LCD 컬러 필터 프린팅 공정에 관한 연구 (A Study on LCD Color Filter Printing Process Using Localized Laser Heating)

  • 나성준;이재학;유중돈
    • 한국레이저가공학회지
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    • 제10권2호
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    • pp.5-15
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    • 2007
  • A new printing process for LCD color filter is proposed in this work by using the localized laser heating, which is called laser-induced spray printing (LISP) process. The LISP is a non-contact process, which injects the ink from the donor substrate to the glass substrate by the bubble pressure induced by laser heating. The temperature distribution of the donor substrate is calculated numerically to explain the ink ejection phenomena. The composition of the ink was includes the red pigment, n-butanol, xylene, BCA and epoxy. Experiments were conducted by using the fiber laser system, and the color filter patterns were deposited successfully under the proper laser heating conditions.

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엑시머 레이저를 이용한 PMMA와 PET의 가공 (Excimer laser induced ablation of PMMA and PET)

  • 신동식;이제훈;서정;김도훈
    • 한국레이저가공학회지
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    • 제6권1호
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    • pp.33-40
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    • 2003
  • The ablative decomposition mechanism of PMMA(polymethyl methacrylate) and PET(polyethylene terephthalate) with KrF excimer laser(λ : 248nm, pulse duration: 5㎱) is investigated. The UV/Vis spectrometer analysis showed that PMMA is a weak absorber and PET is a strong absorber at the wavelength of 248nm. The results(surface debris, melt, etch depth, etching shape) from drilling and direct writing experiments imply that ablation mechanism of PMMA is dominated by photothermal process, while that of PET is dominated by photochemical process.

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펨토초 레이저를 이용한 SUS304 의 마이크로 홈가공 (Micro-groove machining of SUS304 using by femto second laser)

  • 곽태수;오오모리 히토시
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 춘계학술대회 논문집
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    • pp.1179-1180
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    • 2005
  • 3D micro scaled shapes are fabricated with the method of direct writing and superposing grooving in ambient air using femto-second laser pulses and copper, aiming at establishing an industrially useful femto-second laser processing machine to be able to fabricate three dimensional micro-scale structures, especially micro scaled molds, and processing techniques. For the several advantages, there is no thermally influenced region around the area irradiated by the laser beam and surfaces irradiated laser beam are smooth and substances ablated to form are no attached on the surface of works and so on, the femto-second laser technology is anticipated for advanced micro/nano precision technology.

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레이저 화학증착을 이용한 3차원 쾌속조형에 관한 실험적 연구 (Experimental Study of 3-Dimensional Rapid Prototyping by Laser Chemical Vapor Deposition)

  • 유재은;이영림
    • 대한기계학회논문집A
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    • 제29권1호
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    • pp.14-21
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    • 2005
  • Laser chemical vapor deposition can be an effective technique for a rapid prototyping with ceramic materials, in particular. The objective of the study is to fabricate several 3-dimensional objects by stacking multi-layers as well as to find out some basic aspects of a rapid prototyping with laser chemical vapor deposition such as deposition characteristics with traversing speed of the laser, possible problems in stacking multi-layers etc. The limit speed of the laser that can grow a tilted SiC rod was found in this study, and laser directing writing that occurs over the limit speed was also investigated. Finally, a zigzag-shaped rod, a spiral-shaped rod, a wall and a square duct were successfully fabricated with laser chemical vapor deposition of tetramethylsilane

Surface Relief Holograms on azo-polymer film

  • Yatagai, Toyohiko;Harada, Kenji
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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    • pp.293-296
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    • 2002
  • Surface relief holograms are fabricated by means of irradiation of laser interference patterns. The diffraction efficiency and the surface relief depth depend on the writing energy and the polarization of the writing laser beam. This structure is very stable at temperatures under glass transition temperature $T_g$ and can be erased by heating above $T_g$. We proposed a new technique to control the surface relief structure. The electric charge was deposited on the surface relief grating in a corona-depositing poling setup in an oven. The first-order diffraction efficiency measured before and after corona discharge increased from about 0.24 % to about 28 %. This diffraction efficiency increase is mainly caused by the increase of the relief depth caused by the electric charge. The relief depth is increased from 20 nm to 350 nm by corona charging. .

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광학 디스크 기록을 위한 Blu-ray Laser Diode의 온도특성 및 기록품질 개선 (Temperature Characteristic and Writing Quality Improvement of Blu-ray Laser Diode for Optical Disc Recording)

  • 이도한;김영길
    • 한국정보통신학회논문지
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    • 제14권7호
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    • pp.1687-1692
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    • 2010
  • 본 논문에서는 Blu-ray 디스크의 기록을 위한 Laser Diode의 온도특성을 고려한 기록품질의 개선방법에 대해 연구했다. 주변 온도변화에 따라 Blu-ray Laser Diode는 전류-전압 관계로부터 미분저항이 변화하게 되는데 이러한 미분저항이 저온에서 기록품질에 미치는 영향에 대해 분석하고 개선하는 방법을 제안한다.

레이저에 의한 폴리머상의 무전해 도금 시드 형성 메커니즘 연구 (Study on the Formation Mechanism of Electroless Plating Seeds on Polymer by Laser)

  • 백병만;이제훈;신동식;이건상
    • 한국정밀공학회지
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    • 제29권1호
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    • pp.41-47
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    • 2012
  • The LDS(Laser Direct Structuring) is one of the new direct writing methods to fabricate conductive patterns by energy beam. It uses thermoplastic polymers with an additive compound that serves as plating seed after the activation by laser. The advantages of LDS include the miniaturization of electrical components, design flexibility, and a reduced number of production steps. The purpose of this study is to investigate the fundamental mechanism for LDS and the characteristics of conductive patterns by laser parameters. These results were studied by SEM, EDX, and XPS analysis. We have used a 20W pulse-modulated fiber laser and copper electroless plating to fabricate conductive patterns on polymer. The result showed that electroless copper plating seed caused the laser cracking of additive compound. In particular, the additive compound contained in copper metal oxides atoms will be changed to copper metal elements. Also, the characteristics of conductive patterns were dependent on laser parameter, especially laser fluence.

광경화성 폴리머를 이용한 레이저 미세패터닝의 기초연구 (A Study on Laser Micro-Patterning using UV Curable Polymer)

  • 김정민;신보성;김재구;장원석;양성빈
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.612-615
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    • 2003
  • Maskless laser patterning process is developed using 3rd harmonic Diode Pumped Solid State Laser with near visible wavelength of 355 nm. Photo-sensitive curable polymer is irradiated by UV laser and developed using polymer solvent to obtain quasi-3D patterns. We performed basic experiments for the various process conditions such as laser power, writing speed, laser focus, and polymer optical property to gain the optimal conditions. Experimentally, the patterns of trapezoidal shape were manufactured into dimension of 8${\mu}{\textrm}{m}$ width and 5.4${\mu}{\textrm}{m}$ height. This process could be applied to fabricate a single mode waveguide without expensive mask projection method.

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비접촉 센서를 이용한 레이저 자동 포커싱 (Laser Auto Focus Using Non-Touch Sensor)

  • 장정원;김재구;신보성;장원석;최지연
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.280-283
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    • 2003
  • In this paper, there was finding laser beam focal length using the camera at the work with laser preprocess. A process have some similarity that the laser direct writing was condition of unused other light source in order to a partical object of working substrate, so we worked finding focal length using yellow light. As we found focal lengths from three points of substrate edges, The focal length of all substrates was able to be computed by calculating a plane equation using these three point. Also we make a device and software that can automatically perform all of the processes.

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