Method for examining foreign matters in through holes
First Claim
1. A method for examining foreign matters in through holes characterized in that light passing through a plurality of through holes having a uniform size is simultaneously taken as image data, a number of light receiving regions corresponding to the imaged respective through holes, each being treated as a mass, is initially counted, and a process to determine presence or absence of foreign matters is conducted by mutually comparing areas of adjacent ones of the light receiving regions for only a work piece with a counted value of light receiving regions being concurred with a specified value.
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Accused Products
Abstract
Provided herein are a method and an apparatus for examining foreign matters in through holes, which can quickly conduct an examination of foreign matter in through holes with low costs and high accuracy. Light passing through a plurality of through holes having a uniform size is simultaneously taken as image data, the number of areas of the imaged masses corresponding to the plurality of the respective through holes is initially counted, and a process to determine presence or absence of foreign matters is conducted by mutually comparing areas of adjacent masses for only a work piece with a counted value of the masses being concurred with a specified value.
19 Citations
6 Claims
- 1. A method for examining foreign matters in through holes characterized in that light passing through a plurality of through holes having a uniform size is simultaneously taken as image data, a number of light receiving regions corresponding to the imaged respective through holes, each being treated as a mass, is initially counted, and a process to determine presence or absence of foreign matters is conducted by mutually comparing areas of adjacent ones of the light receiving regions for only a work piece with a counted value of light receiving regions being concurred with a specified value.
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4. A method for examining foreign matters in through holes characterized in that light passing through a plurality of through holes having a uniform size is simultaneously taken as image data, a number of light receiving regions corresponding to the imaged respective through holes is initially counted subject to the extracted light receiving regions having area values being within a specified range, a process to determine presence or absence of foreign matters is performed by mutually comparing adjacent ones of the light receiving regions for only a work piece with a light receiving region count value being concurred with a specified value, and the examination is ended when the number of the light receiving regions counted in the step of counting the number of light receiving region does not concur with a specified value.
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5. A method for examining foreign matters in through holes characterized in that light passing through a plurality of through holes having a uniform size is simultaneously taken as image data, the image data is divided into groups and read for each examination region, the number of imaged light receiving regions corresponding to the respective through holes in the examination region is initially counted, and a process to determine presence or absence of foreign matters is performed by mutually comparing areas of adjacent ones of the light receiving regions for only a work piece with a counted number of light receiving regions being concurred with a set value.
Specification