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이택민(Taik-Min Lee),최현철(Hyun-Cheol Choi),노재호(Jae-Ho Noh),김동수(Dong-Soo Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
This paper presents the electro-luminescence (EL) display lamp which is patterned on a curved surface by the pad printing method. The printing methods, including the gravure, screen, flexo, inkjet, and pad printing, have an advantage of one-step direct patterning. However, in general, the printing and semi-conductor process, except pad printing method, cannot be applied for patterning on a curved surface. Thus, in this paper, we used pad printing method for patterning an EL display lamp on a curved surface. The EL display lamp consists of 5 layers: Bottom electrode; Dielectric layer; Phosphor; Transparent electrode; Bus electrode. Finally, we printed EL display lamp on a dish, which has a radius of curvature 80㎜. The EL display lamp was driven at AC 200V of 1㎑.
이택민(Taik-Min Lee),강태구(Tae Goo Kang),양정순(Jeong-Soon Yang),조정대(Jeong-Dai Jo),최병오(Byung-Oh Choi),김광영(Kwang-Young Kim),김동수(Dong-Soo Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
We present a design, analysis, fabrication and performance test of the novel DoD metal-jet system for application to the high-density and high-temperature-melting materials. The theoretical analysis of the metaljet nozzle system is derived by using electro-mechanical analogy. Based on the theoretical analysis results, we design the metal-jet print head system and fabricate the metal-jet system, which can eject the droplet of leadfree metal solder in high-temperature. In the experimental test, we set up the test apparatus for visualization of the droplet ejection and measure the ejected droplet volume and velocity. As a result, the diameter, volume and the velocity of the ejected droplet are about 65 ㎛ ~ 70 ㎛, 145pl ~ 180 pl and 4m/sec, which shows quite good agreement with the theoretical analysis results of the 75 ㎛-diameter and 220 pl-volume of droplet. In comparison with the experimental result, the errors of diameter and volume are 7% ~ 13% and 18 ~ 34%, respectively.
이택민(Taik-Min Lee),강태구(Tae Goo Kang),양정순(Jeong-Soon Yang),조정대(Jeong-Dai Jo),김광영(Kwang-Young Kim),김동수(Dong-Soo Kim) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
In this paper, we present a design, analysis, fabrication and performance test of the novel DoD metal-jet system for application to the high-density and high-temperature-melting materials. Based on the theoretical analysis, we design the metal-jet print head system and fabricate the metal-jet system, which can eject the droplet of lead-free metal solder in the high-temperature. In the experimental test, we set up the test apparatus for visualization of the droplet ejection and measure the ejected droplet volume and velocity. As a result, the diameter, volume and the velocity of the ejected droplet are about 65-70㎛, 145-180 pl and 4m/sec. We also fabricate vertical and inclined 3D micro column structures using the present molten metal inkjet system. The measured geometries of the micro column structures are about height of 2,100㎛, diameter of 200㎛ and aspect ratio of 10.5 for vertical micro column and 1,400㎛ of height and 150㎛ of diameter for 65°- inclined micro column, respectively.