Fractal filter applied to a contamination-free manufacturing signal to improve signal-to-noise ratios
First Claim
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1. A method of manufacturing, the method comprising:
- processing a workpiece in a processing step;
detecting defect data after the processing of the workpiece in the processing step has begun;
filtering the defect data using a fractal filter;
forming an output signal corresponding to at least one type of defect based on the fractally filtered defect data; and
feeding back a control signal based on the output signal to adjust the processing performed in the processing step to reduce the at least one type of defect.
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Abstract
A method is provided for manufacturing, the method including processing a workpiece in a processing step and detecting defect data after the processing of the workpiece in the processing step has begun. The method also includes filtering the defect data using a fractal filter and forming an output signal corresponding to at least one type of defect based on the fractally filtered defect data. The method further includes feeding back a control signal based on the output signal to adjust the processing performed in the processing step to reduce the at least one type of defect.
27 Citations
20 Claims
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1. A method of manufacturing, the method comprising:
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processing a workpiece in a processing step;
detecting defect data after the processing of the workpiece in the processing step has begun;
filtering the defect data using a fractal filter;
forming an output signal corresponding to at least one type of defect based on the fractally filtered defect data; and
feeding back a control signal based on the output signal to adjust the processing performed in the processing step to reduce the at least one type of defect. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of manufacturing, the method comprising:
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processing a first workpiece in a processing step;
detecting defect data in an inspection step after the processing of the first workpiece in the processing step;
filtering the defect data using a fractal filter using one of a Hoshen-Kopelman method and a Ziff method;
forming an output signal corresponding to at least one type of defect based on the fractally filtered defect data; and
feeding back a control signal based on the output signal to adjust the processing performed in the processing step on a second workpiece to reduce the at least one type of defect. - View Dependent Claims (12, 13, 14, 15)
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16. A method of manufacturing, the method comprising:
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processing a workpiece in a processing step;
detecting defect data using an in situ sensor after the processing of the workpiece in the processing step has begun;
filtering the defect data using a fractal filter using one of a Hoshen-Kopelman method and a Ziff method;
forming an output signal corresponding to at least one type of defect based on the fractally filtered defect data; and
feeding back a control signal based on the output signal to adjust the processing performed on the workpiece in the processing step to reduce the at least one type of defect. - View Dependent Claims (17, 18, 19, 20)
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Specification