Patent ID: 8803209

Claim:
A spectrum sensor comprising: a photodetector device; an angle restriction filter that transmits light incident thereon in an incident angle range toward the photodetector device; and a wavelength restriction filter that restricts wavelengths of light that passes through the angle restriction filter, wherein the photodetector device comprises: a first semiconductor region of a first conductivity type electrically connected to a first connecting section; a second semiconductor region of a second conductivity type formed on the first semiconductor region; a third semiconductor region of the second conductivity type formed on the second semiconductor region, the third semiconductor region including a second conductivity type impurity having a higher concentration than a concentration of the second semiconductor region, and electrically connected to a second connecting section; and a plurality of fourth semiconductor regions of the first conductivity type formed on the second semiconductor region, each of the plurality of fourth semiconductor regions being surrounded by the third semiconductor region.