DEFECT INSPECTION DEVICE AND DEFECT INSPECTION METHOD
First Claim
1. A defect inspection device comprising:
- illumination unit that irradiates an object to be inspected, with light, the object having patterns formed on a surface;
light collecting unit that collects light reflected, diffracted, and scattered from the object irradiated with the light by the illumination unit;
optical path branching unit that branches the light collected by the light collecting unit upon receiving the light reflected, diffracted, and scattered from the object into a first detection optical path and a second detection optical path;
a first spatial filter fitted with a first light blocking pattern to block specific reflected, diffracted, and scattered light of the reflected, diffracted, and scattered light traveling towards the first detection optical path created as a result of branching by the optical path branching unit;
first imaging unit that forms an image from the light passed through the first spatial filter;
first image acquisition unit that acquires a first image by detecting the image formed by the first imaging unit;
a second spatial filter fitted with a second light blocking pattern different from the first light blocking pattern, to block specific reflected, diffracted, and scattered light of the reflected, diffracted, and scattered light traveling towards the second detection optical path created as a result of branching by the optical path branching unit;
second imaging unit that forms an image from the light passed through the second spatial filter;
second image acquisition unit that acquires a second image by detecting the image formed by the second imaging unit; and
image processing unit that conducts image processing to extract defect candidates by integratedly processing the first image acquired by the first image acquisition unit and the second image acquired by the second image acquisition unit.
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Accused Products
Abstract
To prevent overlooking of a defect due to reduction in a defect signal, a defect inspection device is configured such that: light is irradiated onto an object to be inspected on which a pattern is formed; reflected, diffracted, and scattered light generated from the object by the irradiation of the light is collected, such that a first optical image resulting from the light passed through a first spatial filter having a first shading pattern is received by a first detector, whereby a first image is obtained; the reflected, diffracted, and scattered light generated from the object is collected, such that a second optical image resulting from the light passed through a second spatial filter having a second shading pattern is received by a second detector, whereby a second image is obtained; and the first and second images thus obtained are processed integrally to detect a defect candidate(s).
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Citations
11 Claims
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1. A defect inspection device comprising:
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illumination unit that irradiates an object to be inspected, with light, the object having patterns formed on a surface; light collecting unit that collects light reflected, diffracted, and scattered from the object irradiated with the light by the illumination unit; optical path branching unit that branches the light collected by the light collecting unit upon receiving the light reflected, diffracted, and scattered from the object into a first detection optical path and a second detection optical path; a first spatial filter fitted with a first light blocking pattern to block specific reflected, diffracted, and scattered light of the reflected, diffracted, and scattered light traveling towards the first detection optical path created as a result of branching by the optical path branching unit; first imaging unit that forms an image from the light passed through the first spatial filter; first image acquisition unit that acquires a first image by detecting the image formed by the first imaging unit; a second spatial filter fitted with a second light blocking pattern different from the first light blocking pattern, to block specific reflected, diffracted, and scattered light of the reflected, diffracted, and scattered light traveling towards the second detection optical path created as a result of branching by the optical path branching unit; second imaging unit that forms an image from the light passed through the second spatial filter; second image acquisition unit that acquires a second image by detecting the image formed by the second imaging unit; and image processing unit that conducts image processing to extract defect candidates by integratedly processing the first image acquired by the first image acquisition unit and the second image acquired by the second image acquisition unit. - View Dependent Claims (2, 3, 4)
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5. A defect inspection method comprising the steps of:
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irradiating an object to be inspected, with light, the object having patterns formed on a surface; collecting light reflected, diffracted, and scattered from the object irradiated with the light; branching the collected light of the light reflected, diffracted, and scattered from the object into a first detection optical path and a second detection optical path; blocking, via a first spatial filter fitted with a first light blocking pattern, specific reflected, diffracted, and scattered light among the reflected, diffracted, and scattered light traveling towards the first detection optical path created as a result of branching; forming a first optical image from the light passed through the first spatial filter; acquiring a first image by detecting the formed first optical image with a first detector; blocking, via a second spatial filter fitted with a second light blocking pattern different from the first light blocking pattern, specific reflected, diffracted, and scattered light among the reflected, diffracted, and scattered light traveling towards the second detection optical path created as a result of branching; forming a second optical image from the light passed through the second spatial filter; acquiring a second image by detecting the formed second optical image with a second detector; and determining defect candidates by integratedly processing the acquired first image and second image. - View Dependent Claims (6, 7, 8)
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9. A defect inspection method comprising:
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irradiating an object to be inspected, with light, the object having patterns formed on a surface; collecting light reflected, diffracted, and scattered from the object irradiated with the light, then detecting with a first detector a first optical image formed by a light passed through a first spatial filter fitted with a first light blocking pattern, and thus acquiring a first image; collecting light reflected, diffracted, and scattered from the object irradiated with the light, then detecting with a second detector a second optical image formed by a light passed through a second spatial filter fitted with a second light blocking pattern, and thus acquiring a second image; and determining defect candidates by integratedly processing the acquired first image and second image. - View Dependent Claims (10, 11)
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Specification