Fine pattern inspection device capable of carrying out inspection without pattern recognition
First Claim
1. A fine pattern inspection device for inspecting a fine pattern comprising a plurality of pattern elements which have the same form and which are formed on an inspection sample, in order to detect a defect in said plurality of pattern elements by the use of an image derived from said fine pattern, said device comprising:
- image obtaining means for obtaining said image from said fine pattern to produce an image signal representing said image, said image signal comprising a plurality of pattern element image signals each of which lasts for a predetermined time duration, said image signal being divided into first and second divided image signals;
a processing unit supplied with said first and said second divided image signals for extracting a defect image and an inverted defect image that is inverted in lightness of said defect image, by carrying out a first process that gives a predetermined delay to said first divided image signal and then inverts the lightness thereof to obtain a processed image signal and carrying out a second process that adds said processed image signal and said second divided image signal to obtain a difference image signal representing a difference image which includes said defect image and said inverted defect image; and
image displaying means supplied with said difference image signal for displaying said defect image and said inverted defect image.
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Accused Products
Abstract
In a fine pattern inspection device for inspecting a fine pattern comprising a plurality of pattern elements which have the same form and which are formed on an inspection sample, the device detects a defect in the plurality of pattern elements by the use of an image derived from the fine pattern. An image obtaining unit obtains the image from the fine pattern and produces an image signal representing the image. The image signal is divided into first and second divided image signals. A processing unit extracts a defect image and an inverted defect image that is inverted in lightness of the defect image, by carrying out a first process that gives a predetermined delay to the first divided image signal and then inverts the lightness thereof to obtain a processed image signal and carrying out a second process that adds the processed image signal and the second divided image signal to obtain a difference image signal representing a difference image which includes the defect image and the inverted defect image. A display device displays the defect image and the inverted defect image.
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Citations
14 Claims
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1. A fine pattern inspection device for inspecting a fine pattern comprising a plurality of pattern elements which have the same form and which are formed on an inspection sample, in order to detect a defect in said plurality of pattern elements by the use of an image derived from said fine pattern, said device comprising:
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image obtaining means for obtaining said image from said fine pattern to produce an image signal representing said image, said image signal comprising a plurality of pattern element image signals each of which lasts for a predetermined time duration, said image signal being divided into first and second divided image signals; a processing unit supplied with said first and said second divided image signals for extracting a defect image and an inverted defect image that is inverted in lightness of said defect image, by carrying out a first process that gives a predetermined delay to said first divided image signal and then inverts the lightness thereof to obtain a processed image signal and carrying out a second process that adds said processed image signal and said second divided image signal to obtain a difference image signal representing a difference image which includes said defect image and said inverted defect image; and image displaying means supplied with said difference image signal for displaying said defect image and said inverted defect image. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A fine pattern inspection device for inspecting a fine pattern comprising a plurality of fine pattern elements which have the same form and which are formed on an inspection sample, in order to detect a defect in said plurality of fine pattern elements by the use of an image derived from said fine pattern, said device comprising:
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image obtaining means for obtaining said image from said fine pattern to produce an image signal representing said image, said image comprising a plurality of fine pattern element image signals each of which lasts for a predetermined time duration, said image signal being divided into first and second divided image signals; a primary processing unit supplied with said first and said second divided image signals for extracting a primary defect image and a primary inverted defect image that is inverted in lightness of said primary defect image by carrying out a primary first process that gives a predetermined delay to said first divided image signal to produce a primary delayed image signal and then inverts the of said primary delayed image signal to produce a primary inverted image signal in order to obtain a primary processed image signal and carrying out a primary second process that adds said primary processed image signal and said second divided image signal to obtain a primary difference image signal representing a primary difference image which includes said primary defect image and said primary inverted defect image; a secondary processing unit supplied with said primary delayed image signal for extracting a secondary defect image and a secondary inverted defect image that is inverted in lightness of said secondary defect image by carrying out a secondary first process that gives said predetermined delay to said primary delayed image signal to produce a secondary delayed image signal and then inverts the lightness of said secondary delayed image signal to produces a secondary inverted image signal in order to obtain a secondary processed image signal and carrying out a secondary second process that adds said secondary processed image signal from said primary delayed image signal to obtain a secondary difference image signal representing a secondary difference image which includes said secondary defect image and said secondary inverted defect image; a first absolute-value circuit supplied with said primary difference image signal for carrying out absolute operation of said primary difference image signal in each of the pattern element images to produce a primary absoluted image signal; a second absolute-value circuit supplied with said secondary difference image signal for carrying out the absolute operation of said secondary difference image signal in each of the pattern element images to produce a secondary absoluted image signal; a selecting circuit supplied with said primary and said secondary absoluted image signals for selecting in each of the pattern element images one absoluted image signal that is lower, in absolute value, than another absoluted image signal from said primary and said secondary absoluted image signals to produce a selected image signal representing a selected image which includes said defect image; and image displaying means supplied with said selected image signal for displaying said defect image. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification