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Automated Inspection of Inserted Clinched Leads in Cards

IP.com Disclosure Number: IPCOM000040244D
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 3 page(s) / 64K

Publishing Venue

IBM

Related People

Kishi, GT: AUTHOR [+2]

Abstract

An analysis routine for an optical card inspection system that takes grayscale image data and processes the data to determine the presence or absence of clinched leads in a hole, prior to soldering. This is done by analyzing the expected asymmetric brightness distribution of the image. A clinched lead is a lead that is inserted through the via hole and then bent over to one side of the hole to hold the component in place. Most clinching is done by machine, so the lead is consistently clinched in a known direction. For example, DIP (Dual Inline Package) leads are always clinched to the outside of the hole away from the component body. A typical empty hole is a set of pixels such as those shown in the following figure. The "*"s represent bright pixels that define the copper pad around the hole.

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Automated Inspection of Inserted Clinched Leads in Cards

An analysis routine for an optical card inspection system that takes grayscale image data and processes the data to determine the presence or absence of clinched leads in a hole, prior to soldering. This is done by analyzing the expected asymmetric brightness distribution of the image. A clinched lead is a lead that is inserted through the via hole and then bent over to one side of the hole to hold the component in place. Most clinching is done by machine, so the lead is consistently clinched in a known direction. For example, DIP (Dual Inline Package) leads are always clinched to the outside of the hole away from the component body. A typical empty hole is a set of pixels such as those shown in the following figure. The "*"s represent bright pixels that define the copper pad around the hole. The empty area in the center of the hole represents the dark pixels that define the hole. *********************************

*************** ***************

*********** ***********

********* *********

******* *******

****** hole ******

****** ******

******* *******

********* *********

*********** ***********

*************** ******pad******

********************************* A lead clinched to the top of the hole would appear as a bright area (represented by "@"s) at the top of the hole. *********************************

*********@@@@@@@@@@@@@@@*********

*********@@@@@@@@@@@@@@@*********

*********@@@@@@@@@@@@@@@*********

******* *******

****** hole ******

****** ******

******* *******

********* *********

*********** ***********

*************** *****pad*******

********************************* The routine works by summing the grayscale values in region A, and subtracting from the sum, the sum of grayscale values in region B. The difference in sums is used to determine the presence (or absence) o...