Method and apparatus for inspection of substrates
Patent 4929845 Issued on May 29, 1990. Estimated Expiration Date: 
February 27, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 27, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3069654 3695771 3794427 3796500 3877814 Page width optical character processing method and system Electrooptical scanning device Automatic circuit board tester Automatic printed circuit dimensioning, routing and inspecting apparatus Apparatus for determining the parameters of figures on a surface InventorsAssigneeApplicationNo. 316004 filed on 02/27/1989US Classes:250/559.05, With imaging250/559.4, With indication of presence of material or feature356/394With comparison to master, desired shape, or reference voltageExaminersPrimary: Nelms, David C.Attorney, Agent or FirmInternational ClassG01N 021/86AbstractInspection of a circuit board (10) to detect missing and misaligned active and passive surface-mounted components (12) and (14), respectively, is accomplished by first illuminating the board with top light to enhance the image of the passive components. The circuit board is then displaced, relative to a linescan camera (28) trained on the board, so that the camera captures the image of successive strips of surface area running across the board perpendicular to its direction of movement. The images captured by the camera (28) are stored and thereafter processed by an image-processing system (33) to determine whether any passive component is missing or misaligned. The circuit board is then illuminated with side light to enhance the image of the active components. The circuit board is again displaced relative to the linescan camera so the camera captures the image of successive strips of surface area on the board. The captured images are stored and then processed by the image-processing system to detect whether any of the active surface-mounted components are missing or misaligned.Other References
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