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US Patent 9704232 Stereo vision measurement system and method

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Patent
Patent
1

Patent attributes

Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
1
Patent Number
97042321
Patent Inventor Names
Jinjin Li1
Lina Karam1
Date of Patent
July 11, 2017
1
Patent Application Number
146620741
Date Filed
March 18, 2015
1
Patent Citations Received
‌
US Patent 11841494 Optical imaging device for a microscope
2
Patent Primary Examiner
‌
Dakshesh Parikh
1
Patent abstract

A method for automatic, stereo vision based, in-line solder ball height and substrate coplanarity inspection includes providing an imaging setup together with an imaging processor for reliable, in-line solder ball height measurement. The imaging set up includes a pair of cameras mounted at two opposing angles with ring lighting around each camera lens, which allows the capture of two images of an electronics package in parallel. The lighting generates features on solder balls located on a substrate of the electronics package, which are then used to determine height. Specifically, points with the same intensity on each solder ball surface are grouped, which allows for the formation of curves, also known as iso-contours, which are then matched between the two views. An optimized triangulation is then performed to determine the height of each one of the solder balls.

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