Patent ID: 7582943

Claim:
A light receiving device comprising a semiconductor substrate and a short-wavelength light receiving section provided on or above a surface of a light entering side of the semiconductor substrate, wherein: the semiconductor substrate comprises regions of a first conductivity type and regions of a second conductivity type in an alternately multiply laminated manner, wherein the second conductivity type is a conductivity type opposite to the first conductivity type; each of junction surfaces between the regions of the first conductivity type and the regions of the second conductivity type is formed to have a depth which enables converting light in a wavelength band, which is different from light in other wavelength band(s) converted by other junction surfaces, to electricity; and the short-wavelength light receiving section is separated from the semiconductor substrate by at least an insulating layer and detects light having a wavelength shorter than the central wavelength(s) of all the respective wavelength bands converted by the junction surfaces.