Inspection data producing method and board inspection apparatus using the method
AssigneeOMRON Corporation
InventorsYoshiki Fujii, Toshiyuki Sugiyama
Life of this patent
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Abstract
After a CAD data and a parts library are combined to produce an inspection data, the set data for the inspection window is automatically corrected using the image of a bare board for a board to be inspected. In this correcting process, an inspection window based on the aforementioned inspection data is set on a bare board image, and then an image in the inspection window W4 making up a reference for setting other windows is binarized, and lands 35 on this binary image are detected. Further, on the basis of the detection result, the set position and size of land windows W1 for solder inspection are corrected, after which the set positions of other inspection windows W2 to W4 are corrected.
Claims11
A method of producing inspection data for inspecting a parts-mounted board by image processing, comprising:
- reading inspection data corresponding to each part on a board constituting an object of inspection from a parts library produced in advance;
- setting the inspection data at a mounting position of the part;
- detecting an image area corresponding to each land on an image picked up from a model of the board constituting the object of inspection;
- and
- based on the detection result, automatically correcting the set data for setting an inspection window included in the read inspection data, when the inspection window is displaced with respect to the image area corresponding to each land, so that the inspection window is adapted for inspection of the board;
- storing, as a correction rule, a relationship between a fillet length for a part and a land size for a part;
- and
- changing, based on the correction rule, a fillet length for the part at a slower rate than a land size for the part, when the design rule change occurs,
- wherein the inspection window is adapted due to a design rule change for one or more of the parts mounted on the board.
A method of producing inspection data for inspecting a parts-mounted board by image processing, comprising:
- reading inspection data corresponding to each part on a board constituting an object of inspection from a parts library produced in advance;
- setting the inspection data at a mounting position of the part;
- detecting an image area corresponding to each land on an image picked up from a model of the board constituting the object of inspection;
- and
- based on the detection result, automatically correcting the set data for setting an inspection window included in the read inspection data, when the inspection window is displaced with respect to the image area corresponding to each land, so that the inspection window is adapted for inspection of the board;
- wherein the step of detecting the image area corresponding to the land comprises:
- retrieving the position of the land edges with reference to a solder inspection window based on the set data before correction on the image of the model,
- wherein left and right boundaries of the land edges are determined by using a histogram while projecting a plurality of binary images in a reference window on a first axis;
- and
- wherein top and bottom boundaries of the land edges are determined by using the histogram while projecting a plurality of binary images in the reference window on a second axis orthogonal to the first axis.
Dependencies are inferred from the claim text.