Design of a long stroke two-axis compliant bearing mechanism for optical micro scanners

摘要

Optical micro scanners are very important instruments for ultra-high precision image stabilization and aliasing reduction in staring infrared imaging optical systems for unmanned aerial vehicle (UAV) application fields. A two-axis compliant bearing mechanism based on distribution compliance right angle flexure hinges is presented for optical micro scanners. The compliant bearing mechanism is used to support a lens as its load. It can guide the load to move translationally along two coordinate axes of a rectangular coordinate system. The mechanical topology structure of the compliant bearing mechanism is introduced. The stiffness analysis and the travel range constraint condition of the proposed compliant bearing mechanism are derived for the purpose of mechanical design. A reified prototype micro scanner equipped with the proposed compliant bearing mechanism is realized and manufactured. The experimental test result shows that the performance of the prototype compliant bearing mechanism can fulfil the expected design objective.