Patent ID: 7538404
Filing Date: 2009-05-26
Classification: H01L

Abstract:
1. An optical semiconductor device comprising: a first light receiving region and a second light receiving region provided on a substrate and respectively include light receiving elements photoelectrically converting an incident light; and a first anti-reflection film formed over the light receiving elements included in the first light receiving region of the substrate and a second anti-reflection film formed over the light receiving elements included in the second light receiving region of the substrate, wherein the first anti-reflection film is not formed over the light receiving elements included in the second light receiving region of the substrate, the second anti-reflection film is not formed over the light receiving elements included in the first light receiving region of the substrate, the reflectance of the first anti-reflection film for a first wavelength range of light is lower than the reflectance of the second anti-reflection film for the first wavelength range of light, and the reflectance of the second anti-reflection film for a second wavelength range of light which is different from the first wavelength range of light is lower than the reflectance of the first anti-reflection film for the second wavelength range of light.