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백색 LED 보정 공정 적용을 위한 고점도 형광체 미세 정량토출 공정
양봉수(Bong Su Yang),양영진(Young Jin Yang),김형찬(Hyung Chan Kim),고정범(Jeong Beom Ko),조경호(Kyung Ho Cho),도양회(Yang Hoi Doh) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.2
Several research works for finding and optimizing the methods of dispensing high viscosity phosphor used in the fabrication of white LED’s are currently in progress. High viscosity phosphor dispensing with a high accuracy is crucial because the dispensing rate and uniformity directly affect parameters such as the CIE chromaticity diagram, color temperature and luminous flux of white LED’s. This study presents a novel method of dispensing high viscosity phosphor using electrohydrodynamic printing. The dispensing rate was optimized less than 0.01 mg phosphor using experiments and optimizing the process parameters including the standoff distance from the nozzle to the substrate, ink supply pressure, and multi-step pulsed waveform magnitude ratio. The dispensing rate was measured by dispensing 20 dots using drop-on-demand with the optimized parameters, and the experiments were repeated 10 times to maximize the data accuracy. The average dispensing rate that can be reliably used for high viscosity phosphor dispensing was 0.0052 mg.
웹 이송제어 기반의 롤투롤 시스템을 위한 ESD 프린팅 시스템 개발
최경현(Kyung-hyun Choi),양봉수(Bong-su Yang),탄충탄(Tran Trung Thanh),도양회(Yang-hoi Doh),김동수(Dong-su Kim) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6
R2R (Roll to Roll) ESD (Electro-static Deposition) system is known as a flexible manufacturing system with many applications. Flexible electronics devices can be made by using ESD printing element technology for mass-production with flexible substrate and conductive ink. Through development of R2R ESD (R2R hybrid) system, R2R ESD takes advantages of low cost, time consumption and high precision. And it is good for manufacturing RFID, solar cell, flexible display etc. This paper proposes a design of ESD printing system and development plan for R2R hybrid system of web transfer control base.
웹 이송제어 기반의 롤투롤 시스템을 위한 ESD 프린팅 시스템 개발
최경현(Kyung-hyun Choi),양봉수(Bong-su Yang),탄충탄(Tran Trung Thanh),도양회(Yang-hoi Doh),김동수(Dong-su Kim) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6월
R2R (Roll to Roll) ESD (Electro-static Deposition) system is known as a flexible manufacturing system with many applications. Flexible electronics devices can be made by using ESD printing element technology for mass-production with flexible substrate and conductive ink. Through development of R2R ESD (R2R hybrid) system, R2R ESD takes advantages of low cost, time consumption and high precision. And it is good for manufacturing RFID, solar cell, flexible display etc. This paper proposes a design of ESD printing system and development plan for R2R hybrid system of web transfer control base.
Effect of flow rate in the generation of printed line in electrostatic inkjet system
Ahsan Rahman(아산 라만),Jeong-Beom Ko(고정범),Hyung-Chan kim(김형찬),Su-Jin Kim(김수진),Khalid Rahman(카리드 래만),Asif Ali(아시프 알리),Bong-Su Yang(양봉수),Adnan Ali(아드난 알리),Yang-Hoi Doh(도양회),Kyung-Hyun Choi(최경현),Dong-Won Je 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
The Electrostatic Inkjet system has a huge number of applications in cost and time effected manufacturing of printed electronics like RFID, flexible display, solar cell, sensors, batteries etc. So, the fundamental focus will be to investigate the drop generation phenomena by applying the electrostatic forces. Electrostatic inkjet printing for printed electronics technology is advancing rapidly but it s still in its infancy as inkjet printing system is not able to design complicated devices. This paper explains the behavior of the multiphysics phenomena of the Drop on Demand (DOD) electrostatic Inkjet system for printed electronics devices.