Patent ID: 7667182

Claim:
A semiconductor photodetector comprising a semiconductor light receiving element having spectral sensitivity in wavelengths from at least a visible light region to infrared region and an optical transmitting resin for sealing at least a light receiving surface of the semiconductor light receiving element formed from boride of one or more elements selected from La, Pr, Nd, Ce, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo or W or in stead of said boride, or in addition to said boride, ruthenium oxide and/or iridium oxide and in which micro particles of said boride and oxide whose particle diameter is not more than 100 nm are dispersed: wherein said optical transmitting resin is dispersed with an amount of the micro particles by which photocurrent can be obtained through the semiconductor light receiving element by transmitting light in wavelengths in the visible light region while blocking light in wavelengths in the infrared region, and a converging structure is provided on the light receiving surface of the semiconductor light receiving element.