液晶投影機之反射式平順圖像法裡樞鈕形狀之振動分析研究

Abstract

本論文旨在探討數位液晶投影機之反射式平順圖像系統 (Reflective Smooth Picture)在振動過程中，樞鈕(Hinge)的型式和材料上的變化對輸出波型漣波(Ripple)的影響。並利用有限元素法ANSYS軟體，模擬反射式平順圖像系統在振動過程之各種物理現象，以決定樞鈕之型式及參數設定，使平順圖像系統不會因質量及共振頻率等因素，而影響其預期之品質。 本實驗將先行假設反射式平順圖像系統是採用鍛造複合技術製造，並在研究過程中進行實驗各種不同材料，以釐清材料阻尼比及樞鈕形狀各對漣波的影響。本文首先介紹反射式平順圖像系統發展的歷史及介紹，亦對於反射式平順圖的生產製造方法、使用材料特性做大略的說明。其次建立本研究於學理上的理論基礎。接下來針對材料進行實驗，以了解材料對輸出漣波的影響，亦將依理論基礎來建立各形式之樞鈕並製作樣品，且利用雷射振動儀進行量測。再來利用有限元素法來分析其樣品的應力分佈狀況，能於此些實驗及理論中，以決定反射式平順圖像系統之樞鈕最佳化之參數。

This paper aims to study the impact of hinges types and materials toward output ripple for reflective smooth picture systems of digital crystal projectors. Using ANSYS to simulate potential phenomenon of reflective smooth picture system during vibration process, hinge type and parameter setting can be defined so that quality of system will not be affected by factors such as mass and resonance frequency. Assuming that system is built with die casting process, this experiment first studies how damping rate and hinge types of different materials will influence ripples. This paper starts with introduction of RSP system and its development history, then briefs manufacturing methods and characteristics of materials used to build the system. Based on assumption of this study, conduct experiments on various materials to reveal how materials shape ripples. Then samples of different types of hinges are built and measured with a laser vibrometer. Finally, distribution of stress is analyzed by the finite element method. With these experiments and assumptions, parameters given optimal hinge of RSP can be identified.