Patent ID: 7361948
Filing Date: 2008-04-22
Classification: G02B

Abstract:
1. A photosensor having a filter function, comprising: a filter device having a colored glass filter and configured for permitting transmission of light of a predetermined wavelength range including a detection target wavelength range; and a light receiving device for receiving the light transmitted through the filter device; wherein said filter device includes a first interference filter structure comprised of a plurality of light transmitting layers stacked on each other, the first interference filter structure being deposited on a face of the colored glass filter; said light receiving device includes a semiconductor photodetector structure having one or more semiconductor layers, a light receiving area being formed in the one or more semiconductor layers within the semiconductor photodetector structure; and said one or more semiconductor layers forming the semiconductor photodetector structure contain In x Al y Ga 1-x-y N (0≦x≦0.21, 0≦y≦1).