Patent ID: 7132644

Claim:
A photosensor for color measurement based on three spectral components comprising: a sensor chip having at least three partial surfaces for detecting the three spectral components; an interference filter structure of three different alternating multi-layer systems of silicon dioxide and titanium dioxide for selective transmission of incident light into said different partial surfaces of the sensor chip; said partial surfaces providing measurement values in response to said selectively transmitted incident light; said three partial surfaces covered by different said multi-layer systems of said filter structure being adapted to the spectral characteristic of the human eye; said partial surfaces being arranged so as to be distributed in a circle sector-shaped manner around a central point with passive webs located therebetween; and each interference filter having a different overlapping transmission function over the wavelength of the light to be measured spectrally being adapted to the response of the human eye in such a way that the product of the base sensitivity curve of the photosensor and said transmission function of the interference filter is proportional to the normal spectral sensitivity curve of the human eye for one of the relevant coordinates of the color space, so that the passed spectral components generate measurement values in said three partial surfaces, which measurement values can be converted into spectral color values with simple scaling relative to one another.