AUTOMATIC OPTICAL APPEARANCE INSPECTION BY LINE SCAN APPARATUS
First Claim
1. A quality assurance system, comprising:
- a stage configured to support a device;
a detector array spaced apart from said stage, the detector array configured to generate a line of data representing light reflected from the device;
a drive configured to move said stage, said detector array or both relative to one another;
a processor operatively connected to said detector array, wherein said processor is programmed to;
generate a sample image of the device on said stage from lines of data received from said detector array,compare a plurality of features of said sample image to a corresponding plurality of features of a reference image, anddetect features in said sample image deviating from corresponding features of the reference image based on the comparison.
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Accused Products
Abstract
A method of inspecting a structure of a device and a system for doing the same is described. The method includes generating a sample image of a device having a structure to be inspected; identifying a plurality of features of the sample image; comparing the plurality of features to a corresponding plurality of features of a reference image; and locating features in the sample image that deviate from corresponding features of the reference image. The generating step includes moving the device, a detector array or both, relative to one another, wherein the detector array is configured to generate a line of data representing light reflected from the device, and assembling lines of data from the detector array to generate a sample image.
40 Citations
20 Claims
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1. A quality assurance system, comprising:
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a stage configured to support a device; a detector array spaced apart from said stage, the detector array configured to generate a line of data representing light reflected from the device; a drive configured to move said stage, said detector array or both relative to one another; a processor operatively connected to said detector array, wherein said processor is programmed to; generate a sample image of the device on said stage from lines of data received from said detector array, compare a plurality of features of said sample image to a corresponding plurality of features of a reference image, and detect features in said sample image deviating from corresponding features of the reference image based on the comparison. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of inspecting a structure of a device, comprising:
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generating a sample image of a device having a structure to be inspected, wherein said generating comprises; moving said device, a detector array or both, relative to one another, wherein the detector array is configured to generate a line of data representing light reflected from the device, and assembling lines of data from said detector array to generate a sample image; identifying a plurality of features of said sample image; comparing said plurality of features to a corresponding plurality of features of a reference image; and locating features in said sample image that deviate from corresponding features of the reference image. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of inspecting a device having a plurality of structures, comprising:
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generating a sample image of a device having a plurality of structures to be inspected, wherein said generating comprises; moving said device, a detector array or both, relative to one another, wherein the detector array is configured to generate a line of data representing light reflected from the device, and assembling lines of data from said detector array to generate a sample image; identifying a plurality of features of said sample image; comparing said plurality of features to a corresponding plurality of features of a reference image; locating features in said sample image that deviate from corresponding features of the reference image; and determining whether or not said device meets a predefined quality control threshold, wherein said identifying comprises calculating image parameters for said sample image using defect detection parameters specific to said type of structure being inspected.
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Specification