光学头三维悬线式力矩器的高次谐振.PDF

15 11 V ol . 15 N o. 11 2007 11 Optics and Pr ecision Eng ineering N ov. 2007 1004924X 2007) 张布卿, 马建设, 程雪岷, 潘龙法 清华大学 光盘国家工程研究中心, 北京100084) : , : 1 700 H z , 4 800 Hz , : , : 光学头; 三维悬线式力矩器; 高次谐振; 有限元法; 模态分布 : T P333. 4 : A Highorder resonance of three axis suspension wire actuator in optical pickup ZH A N G Buqing , M A Jianshe, CH EN G X uem in, PA N L ongf a (Op tical Memory National Engineering Research Center, Tsinghua University, Beij ing 100084, China) Abstract: In or der t o impr ove t he servo contr ol bandw idt h of t he three axis act uat or in a opt ical pick up, t he higho rder resonances in the f ocusing / t racking direct ions ar e st udied. T he induced mecha nism , physical mo del, modal distr ibutio n and t he test approach o n the higho rder r esonance are st ud ied. T he low angle y aw ing model is est ablished acco rding to t he act ual st ress on t he t hr ee ax is actua t o r . T hen t he m odal dist ribut ion and m odes are analy zed and calculat ed w it h the f init e elem ent met h o d. Finally, t he t est m et hod o f t he highorder resonance is intr oduced and t he actuat ors w it h assemble er rors are measured. T he t est result s show t hat t he pitching r esonance u sually appears on t he focusing perf ormance cur ve under t he frequency of 1 700 H z and t he y aw ing resonance u sually appear s on the tr acking perf orm ance curve under the f requency o f 4 800 H z. T he ex periment results are co nsist ent w it h t he f init e elem ent analy sis. T he results also show that the hig horder resonance is the inhere