| 摘要 |
PROBLEM TO BE SOLVED: To achieve an imaging optical system and an imaging optical device having an anti-reflection structure effectively suppressing degradation of an image due to a ghost generated by reflection diffraction light.SOLUTION: An anti-reflection structure 50 (film) prevents reflection of diffraction light DL generated by reflection of incident light L in an imaging element 10 and suppresses and prevents generation of a reflection diffraction ghost due to incidence of the diffraction light DL into the imaging element 10. The imaging element has a wavelength selection element dispersing the incident light into a predetermined transmission wavelength region for each pixel. A reflectivity in the anti-reflection structure is adjusted in accordance with a representative wavelength in a predetermined spectral transmission wavelength region of the wavelength selection element and a pixel pitch between pixels corresponding to the predetermined wavelength selection element. In the anti-reflection structure, the reflectivity is adjusted such that a reflectivity on a side of a longer wavelength than a center wavelength between the shortest transmission wavelength and the longest transmission wavelength is lowest in the spectral transmission wavelength region of the wavelength selection element. |
