Nanyang Technological University

Generic Power Pte Ltd

Fan Hua

Bryan Kok Ann Ngoi

Hak Wee Tang

Yong Joo Puah

There is disclosed an inspection system that combines 2-D inspection and 3-D inspection of the components of an electronic device into one compact module. The inspection system of the present invention comprises a 2-D image acquisition assembly for inspecting 2-D criteria of the components, a 3-D image acquisition assembly for inspecting 3-D criteria of the components, and a computer for control and data analyzing. The 3-D image acquisition assembly comprises a 3-D image sensor and a 3-D light source. The 3-D light source is preferably a laser capable of generating a planar sheet of light that is substantially perpendicular to the inspection plane of the electronic device. The 2-D image acquisition assembly comprises a 2-D sensor and a 2-D light source positioned above the holder. The 2D and 3D image acquisition assemblies are arranged so that the 2D inspection and 3D inspection can be done while the electronic device is being held in one location.

System for 2-D and 3-D vision inspection

A method and apparatus is disclosed for non-contact, on-line inspection of objects including a ball grid array package by means of a shadow moir&eacute; technique combined with a novel flash phase-shifting method. The grid pitch size, ball height, ball diameter, missing ball, coplananity can be determined or measured within several seconds. The apparatus includes a camera for viewing the object, a plurality of light sources arranged in a line for illuminating the object to be inspected, a frame grabber for capturing images of the object, an I/O adapter card for controlling the light sources and a personal computer for data processing. The individual components are integrated into system which provides a three dimensional map which is obtained quantitatively using a novel algorithm. The system can provide coplananity data, as well as data relating to grid pitch, ball height, ball diameter, and missing ball information.

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Singapore, Singapore

Fan Hua