- VCM을 이용한 노광기용 정밀 레티클 스테이지의 저진동 제어시스템 개발
- ㆍ 저자명
- 김문수,오민택,김정한,Kim. Mun-Su,Oh. Min-Taek,Kim. Jung-Han
- ㆍ 간행물명
- 한국공작기계학회논문집
- ㆍ 권/호정보
- 2008년|17권 4호|pp.51-58 (8 pages)
- ㆍ 발행정보
- 한국공작기계학회
- ㆍ 파일정보
- 정기간행물| PDF텍스트
- ㆍ 주제분야
- 기타
This paper presents a new design of the precision stage for the reticle in lithography process and a low hunting control method for the stage. The stage has three axes for X, Y, ${ heta}_z$ those actuated by three voice coil motors individually. The designed reticle stage system has three gap sensors and voice coil motors, and supported by four air bearings and the forward/inverse kinematics of the stage were solved to get an accurate reference position. When a stage is in regulating control mode, there always exist small fluctuations(stage hunting) in the stage movement. Because the low stage hunting characteristic is very important in recent lithography and nano-level applications, a special regulating controller for ultra low hunting is proposed in this paper. Also this research proposed the 2-step transmission system for preventing the noise infection from environmental devices. The experimental results showed the proposed regulating control system reduced hunting noise as 35nm(rms) when a conventional PID generates 77nm(rms) in the same mechanical system. Besides the reticle stage has 100nm linear accuracy and $1{mu}rad$ rotation accuracy at the control frequency of 8kHz.