Hewlett-packard Development Company, L.p.

Hewlett Packard Enterprise Development LP

Jaime E Llinas

Patrick A Raymond

Jian Miremadi

John Hua

Richard Barnett

David G Carpenter

ZeLin Wu

Yanli Li

JunHui Li

Saravanan Rathakrishnan

Yanyan Xia

Example implementations relate to an inspection method for training a measurement machine to accurately measure side joint lengths and detecting a defect among a plurality of solder joints. The method includes receiving a first data representing the side joint lengths of the plurality of solder joints measured by a first measurement machine and a second data representing the side joint lengths measured by a second measurement machine. Further, the method includes determining a correlation value based on a statistical analysis of a relationship between the first data and the second data. The method further includes updating an algorithm used by the first measurement machine to measure the side joint lengths, based on the correlation value to reduce deviation between the first data and the second data. Later, the updated algorithm is used as a dimensional metrology in the first measurement machine for detecting the defect in the solder joints.

Measurement machine and method for detecting a defect in solder joints

The present disclosure provides a circuit board with a first via and a second via, the first and second vias providing an electrical path from a top surface of the circuit board to a bottom surface of the circuit board. The circuit board also includes a first contact pad electrically coupled to the first via and a second contact pad electrically coupled to the second via. The first contact pad is disposed at an angle with respect to a reference line crossing through the center of the first and second vias, and the second contact pad is disposed on an opposite side of the reference line at the angle with respect to the reference line, such that a footprint that encompasses an area between the first and second contact pads does not cover the first and second vias.

Circuit board contact pads

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Houston, TX, United States of America

Jaime E Llinas