Method and apparatus for detecting neck disconnection between land and line of wiring pattern on printed board
AssigneeDainippon Screen Mfg. Co., Ltd.
InventorsRyuji Kitakado, Hiroyuki Onishi
Life of this patent
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Abstract
A method and apparatus for detecting neck disconnection between a land and a line in a wiring pattern on a printed board includes a scanner for obtaining images of the wiring pattern and a through hole formed in the pattern. The image of the wiring pattern is converted to a line image representing a wiring line by thinning the pattern image. A window encompassing the image of the through hole is defined, and part of the thinned pattern image overlapping the window is extracted. The number of end points of the thinned pattern image is counted in the window. If the number of the end points is an odd number larger than one, it is determined that neck disconnection is present in the wiring pattern.
Claims24
A method of inspecting a printed board having a wiring pattern including a wiring line and a through hole surrounded by a land, the method comprising the steps of:
- (a) photoelectrically scanning said printed board to obtain a pattern image representing said wiring pattern and a hole image representing an image of said through hole;
- (b) converting said pattern image to a modified pattern image;
- (c) converting said hole image to a modified hole image;
- and
- (d) analyzing said modified pattern image and said modified hole image to detect a neck disconnection between said land and said wiring line in said wiring pattern.
An apparatus for inspecting a printed board which has a wiring pattern including a wiring line and a through hole surrounded by a land, the apparatus comprising:
- (a) a scanner for photoelectrically scanning said printed board to obtain a pattern image representing said wiring pattern and a hole image representing an image of said through hole;
- (b) a first converter for converting said pattern image to a modified pattern image;
- (c) a second converter for converting said hole image to a modified hole image;
- and
- (d) a detector for analyzing said modified pattern image and said modified hole image to detect a neck disconnection between said wiring line and said land in said wiring pattern.
Dependencies are inferred from the claim text.