Electronics

Electronics

Smartphone Housing Flatness and Height Inspection

Gauge height and establish flatness at high speed

Smartphone housing flatness inspection

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Before smartphone assembly process begins, the device housing must be inspected for any bows, creases, dents, or other deformities that will lead to downstream assembly issues. Deviations from flatness have to be measured at various points along the manufacturing path to ensure that installed parts are properly seated. Openings for the camera must be dimensionally correct and inserted at a specified height. The phone’s band and screen must seal correctly and fully without concealed stress caused by deformation. The entire assembly needs to be damage-free because even subtle deformations can impose strains that decrease housing life, risk failure in glued joints, or impose tension on other components inside.

Due to the fast line speed and quantity of smartphones produced during production runs, any form of mechanical height gauge and flatness measurement can be challenging using 2D machine vision. Additionally, the housing can be any one of a number of different colors, varying textures, and other surface qualities.

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The most reliable method for measuring housing flatness to narrow tolerances is by using laser displacement sensors, such as the Cognex DSMax. This technology delivers a 3D representation of the part, to micron-level accuracy, that is used for precise measurements and inspections. 3D vision systems detect even the smallest dents because it captures height information, in addition to width and length. If needed, a color-coded display provides users with a clear visualization of the 3D image.

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