Evaluation method of the prism unit, method of manufacturing a prism unit and evaluation device

摘要

A method for evaluating (20A) prism unit with (22), (23) prisms having an air gap surface which is inclined with respect to the optical axis (b), and (c), the air gap surface (b), ( The direction Y perpendicular to a second optical axis and the direction X perpendicular to the first, the direction X of the first plane formed by the optical axis and the normal line passing through the optical axis of c) and (YZ plane) show the performance improvement based on the astigmatic difference to bet. May or may evaluate the performance for each of the three colors, even if the performance evaluation for one of the three primary colors of light.