• 제목/요약/키워드: Laser

검색결과 13,852건 처리시간 0.097초

반도체 및 디스플레이 산업에서의 레이저 가공 기술 (Laser Processing Technology in Semiconductor and Display Industry)

  • 조광우;박홍진
    • 한국정밀공학회지
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    • 제27권6호
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    • pp.32-38
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    • 2010
  • Laser material processing technology is adopted in several industry as alternative process which could overcome weakness and problems of present adopted process, especially semiconductor and display industry. In semiconductor industry, laser photo lithography is doing at front-end level, and cutting, drilling, and marking technology for both wafer and EMC mold package is adopted. Laser cleaning and de-flashing are new rising technology. There are 3 kinds of main display industry which use laser technology - TFT LCD, AMOLED, Touch screen. Laser glass cutting, laser marking, laser direct patterning, laser annealing, laser repairing, laser frit sealing are major application in display industry.

로봇 기반 원격 레이저 용접에 관한 연구 (Study on Robot based Remote Laser Welding)

  • 강희신;서정;조택동
    • 한국레이저가공학회지
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    • 제11권4호
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    • pp.21-28
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    • 2008
  • Remote Laser welding technology for manufacturing automotive body is studied. Laser welding and industrial robot systems are used for the robot based laser welding system. The laser system is used 1.6kW Fiber laser(YLR-1600) of IPG. The robot system is used HX130-02 of Hyundai Heavy Industry(payload : 130kg). The robot based laser welding system is equipped with laser scanner system for remote laser welding. The welding joints of steel plate and steel plate coated with zinc are butt and lapped joints. The quality test of the laser welding are through the observation the shape of bead on plate and cross-section of welding part. During past three years the laser system, 4kW Nd:YAG laser (HL4006D) of Trumpf was used and the robot system, IRB6400R of ABB (payload:120kg) was used. The new laser source, robot and laser scanner system are used to increase the processing speed and to improve the process efficiency. This paper introduces the robot based remote laser welding system to resolve the limited welding speed and accuracy of the conventional laser welding system.

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He-Ne 레이저에 대한 문헌과 이를 근거로 한 임상 활용 예의 비교 고찰 (An Analysis of the Correlation between He-Ne Laser Therapy in Literature and Clinical Application)

  • 윤인환;김남권
    • 한방안이비인후피부과학회지
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    • 제19권2호
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    • pp.192-201
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    • 2006
  • Objectives : Recently, He-Ne laser has been used for clinical purpose. We study the medical basis of He-Ne laser therapy and We make a proposal concerning the clinical application of using He-Ne laser in Medicine. Methods : We have selected data related to He-Ne laser therapy and study how to use He-Ne laser in clinic. Results : In biology, He-Ne laser therapy has been effects of an improve in skin regeneration an improve in peripheral and central nerve regeneration an improve in muscle regeneration, an anti-inflammation an alleviation of pain and a bone repair. In oriental medicine, He-Ne laser has been used to laser acupuncture and laser oriental physical treatment. In clinic, He-Ne laser have been used to care several parts like as facial palsy, facial spasm, trigeminal neuropathy, rhinitis and tinnitus. Recently, there is argument that He-Ne laser therapy is suitable to medical insurance. Conclusions : Laser therapy in oriental medicine is widespread and We can apply He-Ne laser to facial palsy, facial spasm, trigeminal neuropathy, rhinitis, tinnitus by using laser acupuncture or laser oriental physical treatment. Till now the whole mechanisms are not fully understood, so we hope to study these mechanisms actively and make suitable to medical insurance device in the near future.

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레이저 마이크로 솔더링과 솔더링 인자 (Laser Micro Soldering and Soldering Factors)

  • 황승준;황성빈;정재필
    • 마이크로전자및패키징학회지
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    • 제27권3호
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    • pp.1-8
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    • 2020
  • In this paper, the principles, characteristics and recent studies of the laser micro soldering are reviewed. The factors which influence laser micro welding and soldering are also included. Laser soldering is a non-contact process that transfers energy to solder joint by a precisely controlled laser beam. In recent electronics industry, the demands for laser soldering are increasing due to bonding for complex circuits and local heating in micro-joint. In laser soldering, there are several important factors like laser absorption, laser power, laser scanning speed, and etc, which affect laser solderability. The laser absorption ratio depends on materials, and each material has different absorption or reflectivity for the laser beam, which requires fine adjustment of the laser beam. Laser types and operating conditions are also important factors for laser soldering performance, and these are also reviewed.

레이저침 시술에 사용되는 레이저 기기의 적용 범위에 대한 고찰 (The Spectrum of Laser Instruments for Laser Acupuncture Application)

  • 황의형;양창섭;장인수
    • Journal of Acupuncture Research
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    • 제26권1호
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    • pp.49-57
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    • 2009
  • Objectives : During the past three decades there has been a significant evolution of laser acupuncture application in the nature of the clinical approach and the research of traditional medicine and laser therapy field. However, there have been no standard and guideline of laser equipment can be applied as laser acupuncture. This study aims to investigate the condition of laser equipment required as a laser acupuncture method. Methods : First, we performed literature search using the Medline(from 1999 to Oct 2008) to confirm types and ranges of laser equipments that can be applied as laser acupuncture. In addition, we investigated the characters of acupoints such as sites and depths, and compared with penetrating depths of each laser. Results : A total of 37 articles for clinical studies using laser acupuncture were selected, and 41 lasers were used. GaAs laser was used three times, GaAlAs laser 14, InGaAlP 18, HeNe laser 4, and Argon laser and CO2 laser were used one time, respectively. From all 361 points of fourteen meridians, depths of 341 points(94.5%) were 1 cun(2.3-3.2cm) or less. The mean depth of all points was 0.48 cun(1.1-1.5cm). Hence, it appeared that the majority of therapeutic lasers satisfied with the condition. HeNe, InGaAlP, GaAlAs, GaAs lasers are recommended for laser acupuncture, however, it may plausible that other surgical lasers could be used as the laser acupuncture, because it have the biostimulation effect to some extent, too. Conclusions : It is suggested that to select appropriate laser type and give the adequate output power to reach the acupoints under the skin using laser acupuncture. Further evaluation and research for the condition of laser acupuncture are warranted.

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Fiber Laser Welding in the Car Body Shop - Laser Seam Stepper versus Remote Laser Welding -

  • Kessler, Berthold
    • Journal of Welding and Joining
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    • 제31권4호
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    • pp.17-22
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    • 2013
  • The excellent beam quality of high power fiber lasers are commonly used for remote welding applications in body job applications. The Welding speed and productivity is unmatched with any other welding technology including resistance spot welding or traditional laser welding. High tooling cost for clamping and bulky safety enclosures are obstacles which are limiting the use. With the newly developed Laser stitch welding gun we have an integrated clamping in the process tool and the laser welding is shielded in a way that no external enclosure is needed. Operation of this laser welding gun is comparable with resistance spot welding but 2-times faster. Laser stitch welding is faster than spot welding and slower than remote welding. It is a laser welding tool with all the laser benefits like welding of short flanges, weld ability of Ultra High Strength steel, 3 layers welding and Aluminium welding. Together with low energy consumption and minimum operation cost of IPG fiber laser it is a new and sharp tool for economic car body assembly.

레이저 용접 로봇의 경로 생성에 관한 연구 (Study on Path Generation for Laser Welding Robot)

  • 강희신;서정;박경택
    • 한국레이저가공학회지
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    • 제13권4호
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    • pp.14-20
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    • 2010
  • Robot path generation and laser welding technology for manufacturing automotive body are studied. Laser welding and industrial robot systems are used with the robot based laser welding system. The laser system used in this study is 1.6kW Fiber laser, while the robot system is 6 axes Industrial robot (payload: 130kg). The robot based laser welding system is equipped with laser scanner system for remote laser welding. The laser source, robot and laser scanner system are used to increase the processing speed and to improve the process efficiency. The welding joints of steel plate are butt and lapped joints. The quality test of the laser welding are through the observation the shape of bead on plate and cross-section of welding part. The 3 dimensional laser welding for non-linear pipe welding line is performed. This paper introduces the robot based laser welding system to resolve the limited welding speed and accuracy of the conventional spot welding system.

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Laser와 PZT - Target간의 반응과 그에 따른 Plume 형성 및 입자 방출에 관한 연구 (Interaction of Laser Beam with PZT - Target and Observation of Laser - Induced Plume and Particle Ejection)

  • 이병우
    • Journal of Advanced Marine Engineering and Technology
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    • 제20권5호
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    • pp.93-102
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    • 1996
  • Laser-induced plume and laser-target interaction during pulsed laser deposition are demonstrated for a lead zirconate titanate (PZT). A KrF excimer laser (wavelength 248nm) was used and the laser was pulsed at 20Hz, with nominal pulse width of 20ns. The laser fluence was~$16J/cm^2,$ with 100mJ per pulse. The laser-induced plasma plume for nanosecond laser irradiation on PZT target has been investigated by optical emission spectra using an optical multichannel analyzer(OMA) and by direct observation of the plume using an ICCD high speed photography. OMA analysis showed two distinct ionic species with different expansion velocities of fast or slow according to their ionization states. The ion velocity of the front surface of the developing plume was about $10^7$cm/sec and corresponding kinetic energy was about 100eV. ICCD photograph showed another kind of even slower moving particles ejected from the target. These particles considered expelled molten parts of the target. SEM morphologies of the laser irradiated targets showed drastic melting and material removal by the laser pulse, and also showed the evidence of the molten particle ejection. The physics of the plasma(plume) formation and particle ejection has been discussed.

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Laser Direct Writing 방법을 이용한 광도파로 제작 (Fabrication of waveguide using UV Ar-ion laser direct writing)

  • 강희신;서정;이제훈;김정오
    • 한국레이저가공학회지
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    • 제8권1호
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    • pp.9-18
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    • 2005
  • The laser direct writing method using a UV Argon-ion laser is studied for fabrication of waveguide. The laser direct writing system is constructed with a vision camera, a xy-stage, a motion controller and the delivery components of a laser beam. The UV Argon-ion laser has wavelength range of $333.6\~363.8$ nm. A photo-active UV curable polymer for a planar light-wave circuit(PLC) of single mode is used. This polymer is irradiated by Argon-ion laser and developed by a solvent after a post-baking. The optimum laser direct writing condition is obtained experimentally by changing various process parameters such as laser power, writing speed and focal length. The propagation and coupling loss of a optical waveguide was measured as 1dB/cm and 0.6dB/cm, respectively. Also, the minimum width of waveguide of $100{\mu}m$(ZPLW-207) is obtained. Finally, the waveguides of line, bend and branch type are successfully fabricated.

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InGaAlP 레이저 경피혈액조사가 정상성인의 심박변이도에 미치는 영향 (The Effect of InGaAlP Laser Transcutaneous Blood Irradiation on Heart Rate Variability in Healthy Adults)

  • 이태호;여진주;설현;장인수
    • 대한한방내과학회지
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    • 제25권4호
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    • pp.25-33
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    • 2004
  • Objective : The effects of Indium-Gallium-Aluminium-Phosphide(InGaAlP) laser transcutaneous irradiation on heart rate variability(HRV) in healthy adults are investigated with power spectrum analysis(PSA) of HRV. Methods : The control group consisted of 20 healthy volunteers (10 men, 10 women). The experiment was divided into 5 different periods, the pre-1st laser period(10 minutes), the 1st laser period(30 minutes), the post-1st laser period(5 minutes), the 2nd laser period( 30 minutes) and the post-2nd laser period(30 minutes). HRV was measured for 5 minutes at the pre-1 st laser period, the post-l st laser period and the post-2nd laser period. The laser period is the period in which InGaAlP laser transcutaneous Irradiation treatment occurs. Results : 1. SDNN of volunteers at post-1st laser period and post-2nd laser period significantly increased compared with that of the pre- 1 st laser period. 2, Ln(VLF) at post-I st laser period significantly increased compared with that of pre-1st laser period, while Ln(HF) at post-2nd laser period significantly decreased compared with those of pre- I st laser period and post-1st laser period, 3. Ln(TP) at post-1st laser period and post-2nd laser period significantly increased compared with that of pre-1st laser period, 4, LF/HF Ratio at post-2nd laser period significantly increased compared with those of pre-1st laser period and post-1st laser period. But the other variables did not significantly change. Conclusions : The results suggest that InGaAlp laser transcutaneous Irradiation in healthy adults is associated with the autonomic nervous systems. Further study is needed for investigating the effects of laser irradiation on autonomic nervous systems.

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