光学ローパスフィルタおよび撮像装置

摘要

PROBLEM TO BE SOLVED: To provide an optical low-pass filter that has a beam separation effect with high symmetry.;SOLUTION: An optical low-pass filter 10 is configured by laminating N-layers (N≥3) of optical anisotropic layers 1 to 4 each separating an incident beam into a plurality of beams. In the optical low-pass filter, when the total value of the beam separation widths of the first to (N-1)-th optical anisotropic layers, of the N-layers of the optical anisotropic layers, is Da μm, and the distance between the beam having the maximum phase difference and the beam having the minimum phase difference, of the beams separated by the first to (N-1)-th optical anisotropic layers, is Ds μm, the condition of Ds≤0.50Da is satisfied.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT