• Title/Summary/Keyword: alignment.

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Development of Panel Alignment Algorithm and Its Application to BGA Lithography Equipment (기판 정렬 알고리즘 개발 및 BGA 노광 장비 적용)

  • Ryu, SUN-Joong
    • Journal of the Korean Society for Precision Engineering
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    • v.26 no.11
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    • pp.77-84
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    • 2009
  • Alignment error of the BGA lithography equipment is mainly caused by the dimensional change of the BGA panel which is generated during the manufacturing processes. To minimize the alignment error, 'mark alignment' algorithm in place of 'center alignment' algorithm was proposed and the optimal solution for the algorithm was derived by simple analytic form. The developed algorithm distributes evenly the alignment error over the whole panel which was evaluated by the numerical simulation. Finally, the developed algorithm was implemented to the controller of the lithography equipment and the alignment error was measured at the fiducial mark location. From the measurement, it is also concluded that the developed alignment algorithm be effective to reduce the maximum value of alignment error.

A Study on the Optical Element Alignment Automation using Multi-Axis Ultra Precision Stage (극초정밀 다축 스테이지를 이용한 광소자 정렬 자동화에 관한 연구)

  • Jeong, Sang-Hwa;Kim, Gwang-Ho
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.15 no.6
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    • pp.64-70
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    • 2006
  • The optical element was usually used in optical devices and optical transfer devices, but it has been recently used in communication, computer and medical equipment. With the development of very high speed optical-communication, the development of the kernel parts of optical communication has also increased. Presently, the alignment of the optical element is time consuming, and an effective alignment algorithm has not yet to be developed. In this paper, the alignment automation of the optical element is studied. The ultra precision stage is applied to an optical element alignment to improve the accuracy of the alignment. The automation program of the optical element alignment is developed by LabVIEW programming to save the alignment time. The alignment algorithms of the optical element consist of field search and peak search algorithms.

Design of SDINS Rapid Initial Alignment Technique Robust to the Pyro-shock in Multi-Launch Rocket System (연속발사 충격에 강인한 SDINS 신속 초기정렬기법 설계)

  • Lee, Hyung-Sub;Han, Kyung-Jun;Lee, Sang-Woo;Yu, Myeong-Jong
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.6
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    • pp.1038-1044
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    • 2016
  • In this paper, a SDINS(Strapdown Inertial Navigation System) rapid initial alignment technique robust to the pyro-shock in multi-launch rocket system is proposed. The proposed method consists of three steps. Firth, transfer alignment is performed to estimate misalignment between MINS(Master INS) and SINS(Slave INS), and the estimated misalignment is written in the memory when transfer alignment is completed. Next, the pre-filtering process is performed to get rid of the acceleration error induced by launcher vibration. Finally, the horizontal alignment is performed to compensate misalignment variation caused by pyro-shock. We verified the performance of the proposed alignment method comparing with the conventional transfer alignment method. The simulation shows that the proposed initial alignment technique improves alignment performance.

A Study of Alignment Tolerance's Definition and Test Method for Airborne Camera (항공기 탑재용 카메라 정렬오차 정의 및 시험방안 연구)

  • Song, Dae-Buem;Yoon, Yong-Eun;Lee, Hang-Bok
    • Journal of the Korea Institute of Military Science and Technology
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    • v.16 no.2
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    • pp.154-159
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    • 2013
  • Alignment tolerance for EO/IR airborne camera using common optic is an important factor in stabilization accuracy and geo-pointing accuracy. Before airborne camera is mounted on the aircraft, defining alignment tolerance and verification of it is essential in production as well as research and development. In this paper we establish basic concept on the definition and elements of alignment tolerance for airborne camera and propose how to measure each of those elements. Components and the measurement sequence of alignment tolerance are as follows: 1) tolerance of alignment between EO and IR LOS. 2) tolerance of sensor alignment. 3) tolerance of position reporting accuracy. 4) tolerance of mount alignment

Development of an Optical Alignment Control Module with High Speed and Accuracy for Optics-Based Products (광학제품을 위한 고속.고정밀 광정렬 제어 모듈 개발)

  • Kim Seung-Chul;Kim Gyung-Bum
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.5
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    • pp.103-110
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    • 2006
  • Automatic optical alignment modules are a key technology in optical communication system. However, the optic component assembly depends highly on manual or semi-automated alignment process. In this paper, a novel alignment mechanism with minimum degree-of-freedom has been designed and theoretical models are derived from geometric optical characteristics on collimators, optical filters and optical ray alignment. The automatic alignment control algorithm has been newly developed based on the mechanism and models, and then we make fast, precise and reliable alignment through the algorithm. The reliability of developed modules has been verified with various simulations and performance evaluations.

Characterization of degree of alignment of polymer microfibers electrospun on a rotating water collector

  • Li, Shichen;Lee, Bong-Kee
    • Journal of Sensor Science and Technology
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    • v.30 no.3
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    • pp.125-130
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    • 2021
  • In this study, the degree of alignment of polymer microfibers produced by electrospinning using a rotating water collector was evaluated. Aligned micro- and nano-fibers are required in various practical applications involving anisotropic properties. The degree of fiber alignment has many significant effects; hence, and accurate quantitative analysis of fiber alignment is necessary. Therefore, this study developed a simple and efficient method based on two-dimensional fast Fourier transform, followed by ellipse fitting. As a demonstrative example, the polymer microfibers were electrospun on the rotating water collector as the alignment of microfibers can be easily controlled. The analysis shows that the flow velocity of the liquid collector significantly affects the electrospun microfiber alignment, that is, the higher the flow velocity of the liquid collector, the greater is the degree of microfiber alignment. This method can be used for analyzing the fiber alignment in various fields such as smart sensors, fibers, composites, and textile engineering.

Development of Vertical Alignment System for Manufacturing AMOLED TV

  • Lee, Yoon-Seok;Han, Seok-Yoon;Lee, Nam-Hoon;Choi, Jeong-Og
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1393-1398
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    • 2009
  • We once have announced that we developed a horizontal large-area alignment system with an alignment accuracy of < ${\pm}3{\mu}m$ and an alignment time of < 30 seconds, a core process module for RGB direct pattering by using a fine metal mask, which can process a Gen 4 ($730{\times}920mm^2$) substrate for high resolution OLED products. In this article, we presents a brand-new vertical alignment system for a even larger substrate of Gen 5 and beyond which can provide a better alignment accuracy and a higher throughput. The newly developed system exhibits an alignment accuracy of < ${\pm}2{\mu}m$ and an alignment time of < 20 seconds which, we believe, can open a new era for manufacturing large-size OLED monitors and TVs.

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Si Induced Polymer Based Alignment Layer for Liquid Crystal Orientations with High Electro-Optic Properties at Low Temperature (저온 공정의 Si을 이용한 PI 배향 막의 전기광학 특성 향상에 대한 연구)

  • Kim, Dai-Hyun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.26 no.9
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    • pp.677-681
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    • 2013
  • Apart from the deposition of alignment layer, alignment process needs to be involved for alignment of liquid crystal (LC) molecules. To simplify manufacturing process, several method were used such as rubbing, ion-beam irradiation, UV irradiation, and lithography. But, eventually it needs another treatment for LC alignment. Here, we suggested Si induced polyimide (PI) alignment layer at low temperature. Using this method, we are able to eliminate the alignment process and found that the alignment and electro-optic performance are much better than that of the rubbed PI LC cells. Compared to the rubbed PI cells, the response time was decreased by 70% and C-V characteristics have hysteresis-free.

A Wafer Pre-Alignment System Using One Image of a Whole Wafer (하나의 웨이퍼 전체 영상을 이용한 웨이퍼 Pre-Alignment 시스템)

  • Koo, Ja-Myoung;Cho, Tai-Hoon
    • Journal of the Semiconductor & Display Technology
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    • v.9 no.3
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    • pp.47-51
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    • 2010
  • This paper presents a wafer pre-alignment system which is improved using the image of the entire wafer area. In the previous method, image acquisition for wafer takes about 80% of total pre-alignment time. The proposed system uses only one image of entire wafer area via a high-resolution CMOS camera, and so image acquisition accounts for nearly 1% of total process time. The larger FOV(field of view) to use the image of the entire wafer area worsen camera lens distortion. A camera calibration using high order polynomials is used for accurate lens distortion correction. And template matching is used to find a correct notch's position. The performance of the proposed system was demonstrated by experiments of wafer center alignment and notch alignment.

Construction of Road Alignment Information Using LiDAR Data (LiDAR 자료를 이용한 도로의 선형정보 구축)

  • Lee, Jong-Chool;Kim, Hee-Gyoo;Seo, Yoong-Cheol;Roh, Tae-Ho
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • pp.471-474
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    • 2007
  • On the road, geometric structure such as horizontal alignment, vortical alignment and crossing inclination ate important to explain characteristics of road and safety analysis. Especially, horizontal and vortical alignment are have to do with safety of covering. In existing road, for the safety analysis or alignment improvement and expansion pavement, it needs alignment factor of road. Alignment factor of road can be acquired by design drawing. But, design drawing can be not exist because of rack of facility management and national policy that centered to construction. And also, existing design drawing have a lot of differences in comparison with another existing design drawing cause of alignment improvement. In this case, for the precise analysis of alignment, 3-dimensional location information on the road centerline and acquisition of location information which related geometric structure are must to be preceded. In this study, therefore, it provide alignment factors which needed to alignment improvement and road safety analysis by acquisition of road space information and extraction of road centerline data using LiDAR data.

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