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이문구,란 슈하이,이수훈,이혜진,성연욱,Lee, Moon-G.,Lan, Shuhuai,Lee, Soo-Hun,Lee, Hye-Jin,Ni, Jun,Sung, Yeon-Wook The Korean Society of Manufacturing Technology Eng 2009 한국공작기계학회지 Vol.18 No.3
Large area micro pattern replication has promising application potential in many areas. Rolling imprint process has been demonstrated as one of the most competitive processes for such micro pattern replication, because it has advantages in low cost, high throughput and high efficiency. In this paper, we developed a prototype of roll-to-flat(R2F) thermal imprint system for large area micro pattern replication process, which is one of the key processes in the fabrication of flexible displays. Experimental tests were conducted to evaluate the feasibility of system and the parameters' effect on the process, such as flat mold temperature, loading pressure and rolling speed. 100mm $\times$ 100mm stainless steel flat mold and commercially available polycarbonate sheets were used for the tests. The experimental results showed that the developed R2F system is suitable for fabrication of various micro devices with micro pattern over large area.
이문구,권대갑,Lee, Moon-G,Gweon, Dae-Gab 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.5
In this paper, a new modeling of a fine actuator for an optical pick-up has been proposed and multiobjective optimization of the actuator has been performed. The fine actuator is constituted of the bobbin which is supported by wire suspension, the coils which wind around the bobbin, and the magnets which cause the magnetic flux. If current flows in the coils, magnetic force is so produced as to be balanced with spring force of wire, so the bobbin is pisitioned. In this model the transfer function from input voltage to output displacementof bobbin has been obtained so that we can describe this integrated system with electromagnetic and mechanical parts. Wire suspension is regarded as a continuous Euler beam, damper as distributed viscous damping, and bobbin as a rigid body which can move up- and down- ward motion only. According to the model, the high frequency dynamic characteristics of the fine actuator can be known and the effect of damping can be investigated while the conventional second order model cannot. In multiobjective optimization, two objective functions have been chosen to maximize the fundamental frequency and the sensitivity with respect to the input voltage of the actuator so that Pareto's optimal solutions have been obtained using .epsilon.-constraint method. These objective functions will satisfy the trends which will enhance the access speed and reduce the tracking error in the optical pick-up technology of next generation. In the result of optimization, we obtain the designs of the optical pick-up fine actuator which has high speed, high sensitivity and low resonant peak. Furthermore, we offer the relation between two object functions so that the designer can make easy choice.
Moon G. Lee(이문구),Lan Shuhuai(란 슈하이),Soo-Hun Lee(이수훈),Hye-Jin Lee(이혜진),Jun Ni,Yeon-wook Sung(성연욱) 한국생산제조학회 2009 한국생산제조학회지 Vol.18 No.3
Large area micro pattern replication has promising application potential in many areas. Rolling imprint process has been demonstrated as one of the most competitive processes for such micro pattern replication, because it has advantages in low cost, high throughput and high efficiency. In this paper, we developed a prototype of roll-to-flat(R2F) thermal imprint system for large area micro pattern replication process, which is one of the key processes in the fabrication of flexible displays. Experimental tests were conducted to evaluate the feasibility of system and the parameters’ effect on the process, such as flat mold temperature, loading pressure and rolling speed. 100㎜ × 100㎜ stainless steel flat mold and commercially available polycarbonate sheets were used for the tests. The experimental results showed that the developed R2F system is suitable for fabrication of various micro devices with micro pattern over large area.
마이크로 부품 조립을 위한 평면 3-PRP 정렬기의 역기구학
이정재(Jeong-Jae Lee),유용환(Young-Hwan Yoo),이창우(Chang-Woo Lee),송준엽(Jun Yeob Song),이수훈(Soo-Hun Lee),홍민성(Min-Sung Hong),이문구(Moon G. Lee) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
In the field of micro-factory, there are demanded on aligning micro-components when they assemble an automatic focusing actuator of camera module for cellular phone and mount a dental crown on artificial root. This paper presents inverse kinematics of three degree-of-freedom (DOF) planar parallel actuated manipulators for the alignment. The 3-PRP (Prismatic-Revolute-Prismatic) manipulator is actuated by the voice coil motors (VCMs). The actuators are arrayed 120° apart symmetrically on the horizontal plate. Numerical simulation of the kinematical motion of 3-PRP manipulator is performed by using inverse kinematics. Furthermore, based on these results, the working range of the manipulator is estimated before experiments. Also, this paper presents control algorithm to drive the manipulator. The control algorithm is using a feedback control based on the inverse kinematics, sensor kinematics and governing equation of VCM. The algorithm controls each VCM independently.
마이크로 부품 조립을 위한 평면 3-PRP 정렬기의 역기구학
이정재(Jeong-Jae Lee),유용환(Young-Hwan Yoo),이창우(Chang-Woo Lee),송준엽(Jun Yeob Song),이수훈(Soo-Hun Lee),홍민성(Min-Sung Hong),이문구(Moon G. Lee) 한국생산제조학회 2010 한국생산제조시스템학회 학술발표대회 논문집 Vol.2010 No.10
In the field of micro-factory, there are demanded on aligning micro-components when they assemble an automatic focusing actuator of camera module for cellular phone and mount a dental crown on artificial root. This paper presents inverse kinematics of three degree-of-freedom (DOF) planar parallel actuated manipulators for the alignment. The 3-PRP (Prismatic-Revolute-Prismatic) manipulator is actuated by the voice coil motors (VCMs). The actuators are arrayed 120° apart symmetrically on the horizontal plate. Numerical simulation of the kinematical motion of 3-PRP manipulator is performed by using inverse kinematics. Furthermore, based on these results, the working range of the manipulator is estimated before experiments. Also, this paper presents control algorithm to drive the manipulator. The control algorithm is using a feedback control based on the inverse kinematics, sensor kinematics and governing equation of VCM. The algorithm controls each VCM independently.
평면형 구조와 Halbach 자석배열 선형모터를 이용한 리니어 XY 스테이지의 설계
김기현,이문구,Kim, Ki-Hyun,Lee, Moon-G. 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.6
In flat panel display or semiconductor industries, they install the equipments with fine line width and high throughput for fabrication and inspection. The equipments are required to have the linear stage which can position the work-piece with high speed, fine resolution on wide range of motion. In this paper, a precision planar linear XY stage is proposed. The stage has a symmetric planar window configuration and is guided by air-bearings on granite plate. The symmetric planar window configuration makes the stage has robustness against dynamic and thermal disturbances. The air-bearings let the stage move smooth on straight guide bar and flat granite surface. The stage is actuated by linear motor with Halbach magnet array (HMA). HMA generates more confined magnetic flux than conventional array. The linear motors are optimized by using sequential quadratic programming (SQP) with the several constraints that are thermal dissipation, required power, force ripple and so on. The planar linear XY stage with the symmetric planar configuration and the linear motors is implemented and then the performance such as force ripple, resolution and stroke are evaluated.