Calibration structure and calibration method for calibrating optical measuring devices
First Claim
1. A calibration structure for calibrating an optical edge profile measuring device, the optical edge profile measuring device comprising:
- a workpiece table;
a camera having an imaging optical unit and being arranged at a distance from the workpiece table;
an illumination unit configured to illuminate the calibration structure; and
a processor configured to evaluate edge positions of the calibration structure, the calibration structure comprising;
a plurality of zones adjoining one another in a plane and along at least one of straight lines and curved lines;
the plurality of zones including first zones adjoining one another along the straight lines and second zones adjoining one another along the curved lines;
the first zones adjoining one another along the straight lines or the second zones adjoining one another along the curved lines having respectively mutually different optical properties;
points at which the zones adjoin one another and which are distinguished as intersection points of the straight lines and the curved lines; and
at least one region with a regular sequence of the zones and the straight and curved lines which results in a regular arrangement of the points within the at least one region,wherein the regular arrangement is given by a regular shortest distance with the length L of the points with respect to one another,wherein the straight lines and the curved lines in a form of circle arcs begin at a point and end at a neighboring point relative to the point, andwherein a length of all lines beginning or ending at the point is greater than 4*L.
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Accused Products
Abstract
A calibration structure for calibrating optical measuring devices is provided. The calibration structure includes a plurality of zones adjoining one another in a plane, wherein the zones adjoin one another along straight lines and/or curved lines and the calibration structure has both zones adjoining one another along straight lines and zones adjoining one another along curved lines, wherein the zones adjoining one another along straight lines or the zones adjoining one another along curved lines have respectively mutually different optical properties. Furthermore, a calibration method for calibrating the optical measuring devices by the calibration structure is provided.
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Citations
17 Claims
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1. A calibration structure for calibrating an optical edge profile measuring device, the optical edge profile measuring device comprising:
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a workpiece table; a camera having an imaging optical unit and being arranged at a distance from the workpiece table; an illumination unit configured to illuminate the calibration structure; and a processor configured to evaluate edge positions of the calibration structure, the calibration structure comprising; a plurality of zones adjoining one another in a plane and along at least one of straight lines and curved lines; the plurality of zones including first zones adjoining one another along the straight lines and second zones adjoining one another along the curved lines; the first zones adjoining one another along the straight lines or the second zones adjoining one another along the curved lines having respectively mutually different optical properties; points at which the zones adjoin one another and which are distinguished as intersection points of the straight lines and the curved lines; and at least one region with a regular sequence of the zones and the straight and curved lines which results in a regular arrangement of the points within the at least one region, wherein the regular arrangement is given by a regular shortest distance with the length L of the points with respect to one another, wherein the straight lines and the curved lines in a form of circle arcs begin at a point and end at a neighboring point relative to the point, and wherein a length of all lines beginning or ending at the point is greater than 4*L. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification