Methods and devices for testing the color fastness of imprinted objects
First Claim
1. A method for testing the authenticity of printed objects by measuring light emanating from an object to be checked in at least two defined spectral regions, comprising:
- the object to be checked is irradiated with light having a spectrum with components in the defined spectral regions, light emanating from the object to be checked is detected in the defined spectral regions, and authenticity testing is effected on the basis of the light detected in the defined spectral regions, said of light emanating from the object is effected at a plurality of places on the object so that a test series is produced from individual measured values for each defined spectral region, a first and second test series are adapted to each other by determining from the measured values of the first test series values of an adapted series that deviate only slightly from the values of the second test series in at least one area where the two test series have substantially an identical qualitative course, and said authenticity testing is effected by comparing the adapted test series.
2 Assignments
0 Petitions
Accused Products
Abstract
Methods and apparatuses for testing the authenticity of objects printed with security link are provided which measure light emanating from, in particular reflected or transmitted by, an object to be checked. To guarantee especially reliable authenticity testing, it is provided that light emanating from the object to be checked is detected indifferent spectral regions outside the visible spectral region. To obtain easily operated and safe authenticity testing, it is provided that light emanating from the object is detected at a plurality of places on the object in at least two selected spectral regions. A test series is produced for each spectral region wherein two test series adapted to each other, and authenticity testing is then performed by comparing the adapted two test series.
39 Citations
24 Claims
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1. A method for testing the authenticity of printed objects by measuring light emanating from an object to be checked in at least two defined spectral regions, comprising:
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the object to be checked is irradiated with light having a spectrum with components in the defined spectral regions, light emanating from the object to be checked is detected in the defined spectral regions, and authenticity testing is effected on the basis of the light detected in the defined spectral regions, said of light emanating from the object is effected at a plurality of places on the object so that a test series is produced from individual measured values for each defined spectral region, a first and second test series are adapted to each other by determining from the measured values of the first test series values of an adapted series that deviate only slightly from the values of the second test series in at least one area where the two test series have substantially an identical qualitative course, and said authenticity testing is effected by comparing the adapted test series. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Apparatus for testing the authenticity of printed objects by measuring light emanating from a object to be checked in at least two defined spectral regions comprising
at least one light source for irradiating the object with light having components in the defined spectral regions, at least one detector for detecting light emanating from a same place of the object, the detector having detection units to detect light in at least the first and second spectral regions and each being sensitive in one of the defined spectral regions, wherein the defined spectral regions are different from one another and are outside the visible spectral region; wherein the apparatus is adapted to detect light emanating from the same place of the object at a plurality of places so that a test series is produced from individual measured values for each defined spectral region and authenticity testing is effected using the test series. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for testing the authenticity of printed objects by measuring light emanating from an object to be checked in at least two defined spectral regions, comprising:
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irradiating the object with light having a spectrum with components in the defined spectral regions;
detecting light emanating from a plurality of places on the object in the defined spectral regions; and
producing a test series from individual measured values for each defined spectral region, the test series produced on the basis of light detected in a first spectral region and the light detected in a second spectral region, both light detected in the first and second spectral regions emanating from the same place, at each of the plurality of places on the object;
wherein the first and second spectral regions are differently defined spectral regions and are outside the visible spectral region;
wherein authenticity testing is effected using the test series. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification