Patent ID: 9306091
Filing Date: 2016-04-05
CPC Classification: H01L

Claim Text:
1. A light receiving device comprising: a light receiving element, the light receiving element having an uneven surface structure including surface electrodes disposed on a light receiving surface of a photodiode, and an insulating layer directly connected to the light receiving surface and the surface electrodes so as to cover an upper surfaces thereof; and an optical substrate disposed over the light receiving element, wherein the optical substrate has a facing surface facing the light receiving element and an incident surface facing the light incident side, a first optical multilayer film is disposed on the incident surface, a second optical multilayer film is disposed on the facing surface, and a third optical multilayer film is disposed on the insulating layer of the light receiving element, wherein: the first optical multilayer film comprises alternately laminated layers of different refractive indexes and the first optical film has a first light transmission property defined by the alternately laminated layers in the first optical multilayer film and by adjusting the number of layers and the film thickness of each layer; the second optical multilayer film comprises alternately laminated layers of different refractive indexes and the second optical film has a second light transmission property defined by the alternately laminated layers in the second optical multilayer film and by adjusting the number of layers and the film thickness of each layer; and the third optical multilayer film comprises alternately laminated layers of different refractive indexes and the third optical film has a third light transmission property defined by the alternately laminated layers in the third optical multilayer film and by adjusting the number of layers and the film thickness of each layer and the number of layers constituting the third optical multilayer film is less than that of the first optical multilayer film and the second optical multilayer film; and wherein the wavelength band of light received by the light receiving element is determined by the three optical multilayer films with individually different light transmission properties.