초록 ▼

A device that is usable to inspect the surface of a material uses an inspection system which includes an optical unit. That optical unit can register the light which is reflected by the surface to be inspected. An illumination system, that uses at least two light sources, provides the light. The opt

A device that is usable to inspect the surface of a material uses an inspection system which includes an optical unit. That optical unit can register the light which is reflected by the surface to be inspected. An illumination system, that uses at least two light sources, provides the light. The optical unit and the illumination system are connected to a control unit. The at least two light sources are arranged spaced at a distance from each other and both emit light directed to a recording region of the optical unit. The optical unit is oriented toward the surface to be inspected and at least one of the illumination light sources can be subdivided into several individual light sources. The control unit controls at least two of the illumination system light sources that are arranged at a distance from each other or the respective individual light sources of at least one of the illumination sources both selectively and independently of each other. The recording region of the optical unit lies on a displacement plane of the surface to be inspected with that surface being displaced through the recording region in relation to the inspection system. The distance between the light sources of the illumination system extends in the displacement direction of the surface to be inspected. The individual light sources of at least one of the sources are arranged transversely to the displacement direction of the surface to be inspected.

대표청구항 ▼

What is claimed is: 1. A device for inspecting a surface of a printing substrate to be inspected comprising:an optical unit adapted to register light reflected from a motif recorded on said surface of said printing substrate to be inspected, said motif recorded on said surface of said printing subst

What is claimed is: 1. A device for inspecting a surface of a printing substrate to be inspected comprising:an optical unit adapted to register light reflected from a motif recorded on said surface of said printing substrate to be inspected, said motif recorded on said surface of said printing substrate to be inspected having at least first and second areas of relative reflectivity which are different from each other, said optical unit being oriented toward said surface of said printing substrate to be inspected and defining a recording area of said surface of said printing substrate to be inspected, said printing substrate to be inspected being movable, with respect to said optical unit; at a rate of travel, in a plane of travel. and in a direction of travel in said plane of travel, said recording area of said printing substrate having a width transverse to said direction of travel and a length in said direction of travel;an illumination system including at least first and second spaced light sources, said first and second spaced light sources being spaced from each other in said illumination system in said direction of travel of said surface of said printing substrate to be inspected, each of said first and second spaced light sources extending over said width of said recording area of said printing substrate, said first spaced light source being adapted to send a first central light beam onto said recording area of said surface of said printing substrate to be inspected at a first angle of incidence, said second spaced light source being adapted to send a second central light beam onto said recording area of said surface of said printing substrate to be inspected at a second angle of incidence different from said first angle of incidence, said illumination system forming a two-dimensional illumination profile having adjustable light intensity values during on-periods of said illumination system on said surface of said printing substrate to be inspected, both in said direction of travel, and transverse to said direction of travel of said surface of said printing substrate to be inspected;a plurality of individual lights in at least one of said first and second spaced light sources, said plurality of individual lights in said at least one of said first and second spaced light sources extending over said width of said recording area of said printing substrate to be inspected and being spaced transversely from each other to said direction of travel of said surface of said printing substrate to be inspected; anda control unit controlling said at least first and second spaced light sources of said illumination system and controlling said plurality of individual lights in said at least one of said at least first and second spaced light sources selectively and independently of each other in accordance with said at least first and second areas of different relative reflectivity of said surface of said printing substrate to be inspected, said control unit controlling switch-on times of said at least first and second spaced light sources of said illumination system in response to said rate of travel of said printing substrate through said recording area and also selectively controlling said switch-on times, on-periods and brightness levels of each of said at least first and second spaced light sources to adjust said two-dimensional illumination profile illuminating said recording area in response to said motif recorded on said surface of said printing substrate to be inspected and providing different illumination situations for said surface of said printing substrate to be inspected in accordance with said differences in said relative reflectivities of said motif recorded on said surface of said printing substrate to be inspected, said light intensity values of said two-dimensional illumination profile in said recording area being adjusted by said control unit in both said direction of travel and transverse to said direction of travel of said surface of said printing substrate to be inspected in response to said different areas of relative reflectivity of said motif recorded on said surface of said printing substrate to be inspected, as said surface of said printing substrate to be inspected travels through said recording area, said optical unit, said illumination system and said control unit defining an inspection system for said at least first and second areas of respective reflectivity difference of said motif recorded on said surface of said printing substrate to be inspected.