Patent ID: 7656530

Claim:
A color density measuring device for determining the color density of an ink layer applied to a printing material, having a light source for illuminating the printing material and a sensor for receiving the light remitted from the printing material, characterized in that the sensor is fashioned as a multicolor image sensor formed with a multicolor camera having a multiplicity of individual red, blue and green sensor points, wherein each of the sensor points has a corresponding wavelength spectrum for the specific color, and a device is provided with the aid of which the light incident at the multicolor image sensor is restricted to at least one predetermined wavelength band and which includes a triple bandpass filter device having three respectively restricted transmission ranges wherein each of the three respectively restricted transmission ranges is restricted to a subregion of the wavelength spectrum of the individual red, blue and green sensor points in such a way that regions of the wavelength spectrum outside of the subregion for the specific color are not passed through the filter device, wherein the subregion of the wavelength spectrum for each of the specific colors lies within a maximum spectral sensitivity of the corresponding sensor point.