• Title/Summary/Keyword: Galvano scanner

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Development of Nd-Yag Laser Marking System for Cylinderical Parts (Nd-Yag 레이저를 이용한 원통 형상 표면 마킹 시스템 개발)

  • Lee, Se-Han;Kang, Jae-Gwan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.9 no.5
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    • pp.70-75
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    • 2010
  • In this paper, laser marking systems dedicated to cylinderical parts was developed. We first develop the marking device which consists of Nd-Yag laser, galvano scanner and additional rotational axis, then develop algorithm for supporting the digital image with bmp data format. Additional rotational axis is so attached as to rotate the cylinderical parts for marking its whole surface. The image is separated into line by line and the separated line image is sent to galvano scanner while rotating the additional axis simultaneously. CxImage library, famous open source code, is employed for the image processing. The developed method was tested with various images and shows that it reduces marking time significantly without reducing marking quality.

Dynamic Characteristic Analysis of Galvano Meter Scanner for Angle Multiplexing of Holographic Data Storage (홀로그래픽 저장장치의 각다중화를 위한 갈바노미터의 동특성 해석 및 정밀 추종 제어)

  • Lee, Jae-Sung;Choi, Jin-Young;Yang, Hyun-Seok;Park, No-Cheol;Park, Young-Pil
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.05a
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    • pp.338-341
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    • 2005
  • This paper proposes a control system for a Galvano meter which can be used in angle multiplexing for a holographic data storage. Due to the small angle multiplexing selectivity and the exposure/delay time of a CCD camera, the system needs to be controlled to satisfy the performance specification. First, the mathematical model is derived by combining the electrical and mechanical dynamic equations. Then, the obtained model was tuned by the experiments. Finally, a PID controller using DSP was designed and was applied the holographic system. From this approach, we successfully meet the performance specification.

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Head Fixed Type Multi-Focus Display System Using Galvano-Scanner and DMD(Digital Micro-Mirror Device) (갈바노 스캐너와 DMD(Digital Micro-mirror Device)를 이용한 두부 고정형 다초점 디스플레이 시스템)

  • Kim, Dong-Wook;Kwon, Yong-Moo;Kim, Sung-Kyu
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.10B
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    • pp.1117-1123
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    • 2009
  • Head fixed type multi-focus display system using Galvano-scanner and DMD(Digital Micro-mirror Device), which is able to perfectly accommodate, can solve eye fatigue due to conflict between convergence eye movement and accommodation action in stereoscopic display. This system is able to accommodate through making convergence point about each view point and offering it in front of observer's pupil by using laser scanning method. In this paper, we analyzed laser scanning method of this multi-focus display system. And multi-focus display system based on this analysis was made, which showed that focus adjustment was possible through video camera. As a result, formation principle of view point of multi-focus system by laser scanning method was verified.

Development of a time multiplexed HMD type multi-focus 3D display system

  • Kim, Dong-Wook;Lim, Tong-Kun;Kwon, Yong-Moo;Kim, Sung-Kyu
    • 한국정보디스플레이학회:학술대회논문집
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    • 2006.08a
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    • pp.1314-1317
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    • 2006
  • The problem of the conflict between eye convergence and accommodation can be induced at Stereoscopic or multi-view 3D display system using binocular disparity. A multi-focus 3D display system was developed, which can solve the problem. LEDs are used instead of galvano scanner and laser to avoid mechanical moving part at the 3D display system.

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The Study of Micro Fabrication using Picosecond Laser Ablation (피코초 레이저 어블레이션을 이용한 미세 가공 연구)

  • Noh, Ji-Whan;Sohn, Hyon-Kee;Suh, Jeong;Lee, Jae-Hoon
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.2
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    • pp.25-28
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    • 2010
  • The micro fabrication on the mold material using picosecond laser ablation processing has been studied. We used the two kind of system with picosecond laser. First one is two mirror type scanner and telecentric f-theta lens. Second one is X-Y stage and objective lens. By using these system, the $100{\mu}m$ size chess patterning and $2{\mu}m$ size patterning was fabricated. Especially $2{\mu}m$ size patterning on the mold material can be used as the decorative rainbow color logo for industrial field. In this paper, it is proved the picosecond laser is effective tool for the laser ablation processing.

Measurements of Defects after Machining CFRP Holes Using High Speed Line Scan (고속 라인 스캔 방식을 이용한 CFRP 가공 홀 표면 및 내부 결함 검사)

  • Kim, Teaggyum;Kyung, Daesu;Son, Unchul;Park, Sun-Young
    • Journal of the Korean Society for Precision Engineering
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    • v.33 no.6
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    • pp.459-467
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    • 2016
  • Using a line scan camera and a Galvano mirror, we constructed a high-speed line-scanning microscope that can generate 2D images ($8000{\times}8000pixels$) without any moving parts. The line scanner consists of a Galvano mirror and a cylindrical lens, which creates a line focus that sweeps over the sample. The measured resolutions in the x (perpendicular to line focus) and y (parallel to line focus) directions are both $2{\mu}m$, with a 2X scan lens and a 3X relay lens. This optical system is useful for measuring defects, such as spalling, chipping, delamination, etc., on the surface of carbon fiber reinforced plastic (CFRP) holes after machining in conjunction with adjustments in the angle of LED lighting. Defects on the inner wall of holes are measured by line confocal laser scanning. This confocal method will be useful for analyzing defects after CFRP machining and for fast 3D image reconstruction.

A Study on the Ablation of AZ5214 and SU-8 Photoresist Processed by 355nm UV Laser (355nm UV 레이저를 이용한 AZ5214와 SU-8 포토레지스트 어블레이션에 관한 연구)

  • Oh, J.Y.;Shin, B.S.;Kim, H.S.
    • Laser Solutions
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    • v.10 no.2
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    • pp.17-24
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    • 2007
  • We have studied a laser direct writing lithography(LDWL). This is more important to apply to micro patterning using UV laser. We demonstrate the possibility of LDWL and construct the fabrication system. We use Galvano scanner to process quickly micro patterns from computer data. And laser beam is focused with $F-{\theta}$ lens. AZ5214 and SU-8 photoresist are chosen as experimental materials and a kind of well-known positive and negative photoresist respectively. Laser ablation mechanism depends on the optical properties of polymer. In this paper, therefore we investigate the phenomenon of laser ablation according to the laser fluence variation and measure the shape profile of micro patterned holes. From these experimental results, we show that LDWL is very useful to process various micro patterns directly.

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Measurement of minimum line width of an object fabricated by metal 3D printer using powder bed fusion type with stainless steal powder (스테인리스강을 사용한 분말 적층 용융 방식의 금속 3차원 프린터에서 제작된 물체의 최소 선폭 측정)

  • Son, BongKuk;Jeong, Youn Hong;Jo, Jae Heung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.10
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    • pp.346-351
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    • 2018
  • Metal three-dimensional (3D) printing technologies are mainly classified as powder bed fusion (PBF) and direct energy deposition (DED) methods according to the method of application of a laser beam to metallic powder. The DED method can be used to fabricate fine and hard 3D metallic structures by applying a strong laser beam to a thin layer of metallic powder. The PBF method involves slicing 3D graphics to be a certain height, laminating metal powders, and making a 3D structure using a laser. While the DED method has advantages such as laser cladding and metallic welding, it causes problems with low density when 3D shapes are created. The PBF method was introduced to address the structural density issues in the DED method and makes it easier to produce relatively dense 3D structures. In this paper, thin lines were produced by using PBF 3D printers with stainless-steel powder of roughly $30{\mu}m$ in diameter with a galvano scanner and fiber-transferred Nd:YAG laser beam. Experiments were carried out to find the optimal conditions for the width of a line depending on the processing times, laser power, spot size, and scan speed. The optimal conditions were two scanning processes in one line structure with a laser power of 30 W, spot size of $28.7{\mu}m$, and scan speed of 200 mm/s. With these conditions, a minimum width of about $85.3{\mu}m$ was obtained.