• The Transactions of the Korean Institute of Electrical Engineers P
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• v.65 no.1
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• pp.57-65
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• 2016

This paper was analyzed the characteristics of piezoelectric inkjet print head using finite element method(FEM). It showed the bending node driving of piezoelectric and relation theory principle consider piezoelectric material characteristics and ink characteristics. From such result we were had the piezoelectric head design and manufacture. It got a this head characteristics through experiment, we confirmed that proper voltage control is possible to through ink drop control experiment of piezoelectric print head. This paper was obtained the suitable ink jetting characteristics that manufacture the control circuit and piezoelectric inkjet print head. This practice product was applied to improvement of PCB electric circuit pattern by etching resist ink that PCB manufactured to complex process over traditional 6 stages can be simpled to 1 stage by inkjet printing technology.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.06a
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• pp.548-549
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• 2007

과거 PCB 제조의 주된 화제는 다양한 산업분야의 발전을 위해 한정된 시간 안에 좀 더 많은 PCB를 양산하는 기술 개발에 집중되어 있었지만, 현재는 비정상적인 공정 상태를 파악함으로써 제조 공정 환경에서의 오류를 줄여 전체 수률을 높이는 방법에 시선을 돌리고 있다. PCB 에칭의 경우 에칭 용액의 상태를 실시간으로 모니터링 하는 것이 중요하다. 본 논문에서는 기존 애칭용액의 상태를 판단할 때 사용되는 ORP 센서 대신, RGB 센서를 이용하여 실시간으로 용액의 상태를 모니터링 할 수 있는 시스템을 개발 하였다. 개발된 시스템을 이용하여 기존 ORP 시스템과의 비교 분석을 및 RGB 센서률 이용한 모니터링 방법이 ORP 센서를 이용한 방법 보다 좀 더 쉽고 정확하게 에칭 액의 상태를 모니터링할 수 있다는 것을 확인 하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06c
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• pp.446-449
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• 2007

영상 학습은 컴퓨터를 이용한 자동 시각 검사에서 매우 중요하고 어려운 단계이다. 전자산업과 같이 신제품 개발 주기가 짧고 다양한 제품들을 검사하여야 하는 분야에서 어렵고 복잡한 학습 과정은 큰 문제가 되고 있다. 본 연구에서는 CAD 파일을 이용하여 PCB 자동 시각 시스템의 학습 과정을 손쉽게 할 수 있는 방안을 제시하였다.

• The Safety technology
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• no.166
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• pp.18-19
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• 2011

1965년 국내 최초로 인쇄회로기판 전문 업체로 설립된 이래 40년이 넘게 외길을 걸어온 대덕GDS(주) 그동안 기술력과 선로를 바탕으로 꾸준히 성장해, 현재는 제1공장에서 일반 가전용 기판을 제2공장에서 산업용 기판을 집중 생산하고 있다. 또 최첨담 FPCB 생산라인을 구축해 국내에서는 유일하게 PCB 전 기종을 생산하는 종합PCB업체로 발전했다. 대덕지GDS(주)가 이처럼 성장할 수 있었던 데에는 품질향상과 기술개발에 힘을 쏟은 것도 있지만, 근간에는 남다른 안전관리가 있었기 때문이다. 한결같이 안전을 실천하고 있는 연재보 안전관리자를 찾아가 봤다.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.22 no.50
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• pp.11-21
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• 1999

In this paper, an algorithm to generate the mounting position and orientation of SMD is proposed. For the proposed algorithm, we used the image captured from PCB and utilized image processing technique. Pre-processing technique, threshold level determination method, divided recognition of the SMD pattern on a PCB, calculating mounting position and orientation are related topics of this research. All of the related topics were reviewed and the results of this research were obtained from applying the algorithm to the real Surface Mounting Machine(model:MCUl/CPM) made by Samsung Electronics Co.

• Journal of Advanced Navigation Technology
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• v.23 no.5
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• pp.430-436
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• 2019

It is needed to develop an antenna with features of subminiature, light weight and multi-band operation for the variaty services in maritime and industrial fields. The PCB pattern antenna is one of the appropreiate antennas solving these requirements. In this research, the design and fabrication of the PCB pattern antenna operating on the single band of 920 MHz are investigated. The final goal is that the development of the dual band PCB pattern antenna operating on 260 MHz and 920 MHz, which is based on the proposed antenna. It is evident that the performance in the frequencies of 902 MHz, 915 MHz and 928 MHz among of 920 MHz ISM band is better than that in other frequencies. It is also confirmed that the differences of the voltage standing wave ratio, return loss, gain and efficiency between three frequencies are less than 5%. It is expected that the development of communication link of 5-10 km is possible when the induced results are applied into the low power wide area (LPWA) network desinged by the rule of -30 dB sensitivity.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2012.05a
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• pp.38-56
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• 2012

현재 사용되고 있는 다양한 Surface Finish들 중 대표적인 것들을 골라 Galvanic Reaction에 의해 어떤 품질 및 신뢰성 문제가 산업현장에서 발생되고 있는지 살펴보고 그리고 개선의 방법으로는 어떤 것들이 있는지 검토해 보았다.

• Journal of Radiation Industry
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• v.9 no.3
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• pp.153-159
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• 2015

Reliability of printed circuit board (PCB), which is based on high integrated circuit technology, is having been important because of development of electric and self-driving car. In order to answer these demand, automated X-ray inspection (AXI) is best solution for PCB non-destructive test. PCB is consist of plastic, copper, and, lead, which have low to high Z-number materials. By using dual energy X-ray imaging, these materials can be inspected accurately and efficiently. Dual energy X-ray imaging, that have the advantage of separating materials, however, need some solution such as energy separation method and enhancing efficiency because PCB has materials that has wide range of Z-number. In this work, we found out several things by analysis of X-ray energy spectrum. Separating between lead and combination of plastic and copper is only possible with energy range not dose. On the other hand, separating between plastic and copper is only with dose not energy range. Moreover the copper filter of high energy part of dual X-ray imaging and 50 kVp of low energy part of dual X-ray imaging is best for efficiency.

• IE interfaces
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• v.10 no.1
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• pp.155-167
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• 1997

The purpose of this study is to develop the program for efficient operation of a multi-functional surface mounting device(SMD) which mount various components on a printed circuit board(PCB). These components are provided by diverse types of feeders such as cassette, stick and tray feeders. The SMD has one or two heads. In the SMD, the positions of PCB and feeders and fixed, and the head moves to pick up a component from a feeder and to mount it on the PCB. The number of lanes occupied by each feeder and the nozzle used for each component can be different. We develop an off-line program to minimize the cycle-time of the SMD by studying the optimal assignment of feeders and the optimal mounting sequence of components. Graphical User Interface(GUI) is also developed. Additionally, we consider the line balancing problem which appears when two SMDs are used sequentially.

• Journal of Korea Society of Industrial Information Systems
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• v.1 no.1
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• pp.29-62
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• 1996

In this paper, the problem of determining cyclic schedules for a material handling hoist in the printed-circuit-board(PCB) electroplating line is considered. The objective of this research is to determine an optimal simple-cycle schedule of the hoist which in turn maximizes the line throughput rate. Previous approaches to the cyclic hoist scheduling problem are all mathematical programming-based approaches to develop cyclic schedules(Mixed Integer Programming, Linear Programming based Branch and Bound, Branch and Bound Search Method and so on). In this paper, a genetic algorithm-based approach for a single hoist scheduling in the PCB electroplating line is described. Through some experiments for the well known example data and randomly generated data, the proposed algorithm is shown to be more efficient than the previous mathematical programming-based algorithm.