REFRACTIVE INDEX MEASURING METHOD FOR PLASTIC LENS WITH CURVATURE

摘要

PURPOSE: A method for measuring a shape and a refractive index of a curvature-shaped plastic lens is provided to measure shapes and refractive indexes of several portions with comparative ease by using a digital holography microscope. CONSTITUTION: A method for measuring a shape and a refractive index of a curvature-shaped plastic lens (30) is as follows. A refractive index of a portion of the plastic lens is measured. The measured refractive index is defined as an average refractive index of the plastic lens. Refractive index matching oil (10) which is matched with the average refractive index and relative refractive index oil (20) in which a refractive index is different from the average refractive index are prepared. The refractive index matching oil and the relative refractive index oil are stored in the upper and lower part of a container which is partitioned by the plastic lens. A first phase contrast phase is obtained from a transmission-type digital holography microscope by irradiating lights of a first wavelength to the container from the bottom to the top. A second phase contrast phase is obtained from the transmission-type digital holography microscope by irradiating lights of a second wavelength to the container from the bottom to the top. A third phase contrast phase is obtained from the transmission-type digital holography microscope by irradiating lights of a third wavelength to the container from the bottom to the top.