Patent ID: 7787125

Claim:
Apparatus ( 10 ) for measuring a spectral distribution of a printed product ( 12 ) produced with a printing device, comprising: a support ( 14 ); an illuminating means ( 20 ) fixedly mounted to the support ( 14 ) for emitting light, optic means ( 22 ) fixed relative to the illuminating means ( 20 ) for focusing the light emitted from the illuminating means ( 20 ) into a light beam ( 24 ), directing the light beam ( 24 ) onto the printed product ( 12 ) at an acute angle to a surface of the printed product and producing a reflected light beam ( 26 ) reflected substantially perpendicularly from the surface of the printed product ( 12 ), and an arrangement ( 16 ) fixedly mounted on the support ( 14 ) and supported in fixed relationship relative to the illuminating means ( 20 ) and the optic means so that the arrangement disposed for receiving the reflected light beam ( 26 ), the arrangement ( 16 ) including an optical dispersing means ( 28 ) with a surface aligned at an acute angle to the reflected light beam ( 26 ) and disposed for receiving the reflected light beam ( 26 ) and dispersing wavelengths of reflected light beam ( 26 ), an optoelectronic measuring means ( 32 ) fixed in the arrangement ( 16 ) for measuring a reflectance value of a section of the spectrum of the reflected light beam ( 26 ) dispersed by the optical dispersing means ( 28 ), the reflected light beam ( 26 ) defining a light entry gap plane that extends directly from the surface of the printed product ( 12 ) to be examined to the dispersing means ( 28 ).