抄録
Recently, needs for high-precision large aspheric glass lenses are increasing. The chromatic aberration is caused by changing the refractive index by the wavelength of light. In order to remove the chromatic aberration, it is effective to counteract the change of refractive index by combining the convex lens and concave lens. In this study, magnetic field-assisted polishing setup using a permanent magnet is proposed and developed for the uniform polishing of the concave large aspheric glass lenses. In this experiment, the ground concave aspheric glass lenses were polished uniformly and the changes of the aspheric form and surface roughness were evaluated. The experimental results show that very smooth surfaces of 10 nm Rz were obtained by 90-minute polishing. It was clarified that the proposed uniform polishing methods are useful for the finishing of large concave aspheric glass lenses.
