| 摘要 |
PROBLEM TO BE SOLVED: To reduce the sizes of a spectrum sensor and angle restriction filter.SOLUTION: An angle restriction filter 10 comprises: an optical path wall section formed from a plurality of light shield members 13 laminated in layers including a common material, and forming an optical path in a lamination direction of the light shield members 13; and a light transmission section formed in a region surrounded by the optical path wall section. The angle restriction filter 10 restricts the incident angle of light passing through an optical path. The spectrum sensor comprises: the angle restriction filter 10 recited above; a wavelength restriction filter 20 that restricts wavelengths of light that passes through the angle restriction filter 10; and a photodetector element 30 that detects light that has passed through the angle restriction filter 10 and the wavelength restriction filter 20. |
