磁界によって配向した短繊維で強化したマイクロ部品の光造形（短繊維を配向した薄膜の積層）

摘要

光造形法はマイクロサイズの構造物を製作する有力な手段の一つであり，高アスペクト比（高さ／幅)をもつ部品から三次元形状の部品まで製作することができる．しかし光造形法では，その素材は紫外線硬化樹脂に限られる．このため，樹脂に粒子や短繊維を混合して造形する研究が報告されている．これらの報告では，樹脂に混合する材料として短繊維を使用する場合でも，短繊維を特定の方向にそろえていない．%The purpose of this research work is to produce micro part reinforced by unidirectional short fibers by laser photolithography. Ferromagnetic short fibers are added to liquid photopolymer. By applying magnetic field to this mixture, the axes of the short fibers are aligned along the direction of the magnetic field. Then, the photopolymer is solidified by the irradiation of UV laser in the desired shape. The solidified thin films with aligned short fibers are layered until the desired height is obtained. The surfaces of the solidified thin layers are observed by scanning electron microscope and the possibilities of the reinforcing effect between each layer are examined. Several examples of micro structure reinforced by unidirectional short fibers are produced by this method.