| 摘要 |
The present invention is provided with a lens substrate (11) having a diffraction grating formed on the surface thereof and an optical adjustment film (15) arranged on the diffraction-grating surface of the lens substrate on which the diffraction grating is formed, and has positive power. The optical adjustment film is formed of a material that, relative to the lens substrate, has a higher refractive index and a lower wavelength dispersion of the refractive index, and the diffraction-grating surface is substantially parallel to a surface perpendicular to an optical axis (13) in a reference position (17) defined as a position at 70% (Rr) of the effective radius (Re) from the center of the diffraction grating. It is possible to provide a diffraction-grating lens and an image-capturing device capable of minimizing the generation of unnecessary diffraction light. |
