Patent ID: 8625092
Filing Date: 2014-01-07
Classification: B41F,G01J,G01N

Abstract:
1. Apparatus ( 10 ) for measuring a spectral distribution of a translucent printed product ( 12 ) produced with a printing device and moved in a moving direction relative to the apparatus ( 10 ), comprising an illumination means ( 20 ) for producing a plane of light ( 26 ) aligned substantially normal to the printed product ( 12 ) and substantially normal to the moving direction for illuminating a substantially linear strip of the printed product ( 12 ), a camera unit ( 16 ) mounted fixedly on a side of the printed product ( 12 ) opposite the illumination means ( 20 ) and having an optical dispersing means ( 28 ) disposed to be impinged upon by the plane of light passing through the translucent printed product ( 12 ), the dispersing means ( 28 ) being oriented for dispersing the wavelengths of the transmitted light ( 26 ) outward from the plane of the light ( 26 ) and transmitting the dispersed light ( 26 ) of the light plane from the dispersing means ( 28 ) into the camera unit ( 16 ), a rectangular array of photo elements ( 32 ) disposed in the camera unit ( 16 ) at a position to be impinged upon by dispersed wavelengths of light transmitted by the dispersing means ( 28 ) and projection optics ( 30 ) between the array of photo elements ( 32 ) and the dispersing means ( 28 ) for correcting the dispersed light to achieve optimum coverage on the array of photo elements ( 32 ), the projection optics ( 30 ) being the single projection optics between the translucent printed product ( 12 ) and the array of photo elements ( 32 ), wherein the light (