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