拓未 松井

TL;DR: In this article, the direction from the peak of the boundary surface B of a liquid crystal element QL to the radius center of the least radius of curvature is made to match the direction of the peak to an aperture stop S, so that the boundary surfaces B becomes nearly concentric with the stop, and the angle of incidence of an off-axis light beam on B (the angle between the incident light beam and the normal of B) when the boundarysurface B has the largest refracting power can be made small.