Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Method of manufacturing ball array devices using an inspection apparatus having two or more cameras and ball array devices produced according to the method










Image Number 14 for United States Patent #7653237.

A calibration and part inspection method for the inspection of ball grid array, BGA, devices. Two cameras image a precision pattern mask with dot patterns deposited on a transparent reticle. The precision pattern mask is used for calibration of the system. A light source and overhead light reflective diffuser provide illumination. A first camera images the reticle precision pattern mask from directly below. An additional mirror or prism located below the bottom plane of the reticle reflects the reticle pattern mask from a side view, through prisms or reflective surfaces, into a second camera and a second additional mirror or prism located below the bottom plane of the reticle reflects the opposite side view of the reticle pattern mask through prisms or mirrors into a second camera. By imaging more than one dot pattern the missing state values of the system can be resolved using a trigonometric solution. The reticle with the pattern mask is removed after calibration and the BGA to be inspected is placed with the balls facing downward, in such a manner as to be imaged by the two cameras. The scene of the part can thus be triangulated and the dimensions of the BGA are determined.








 
 
  Recently Added Patents
Memory device and method for repairing a semiconductor memory
Method and apparatus for communication
Method for forming contact in an integrated circuit
Selective thermal treatment of medical instrument portions with thermal treatment system instrument holder
Headset, terminal, and method capable of switching headset mode
Method and apparatus for selective decoding in a wireless communication system
Methods to fabricate a photoactive substrate suitable for microfabrication
  Randomly Featured Patents
Function selector
Printer having printhead angulator assembly
Multiband antenna for vehicles
Process for producing oligocarbonates
Apparatus for use in a liquid alkali metal environment
Device for changing a numbering and imprinting device in a printing press
Optical system for microfilm
Methods and apparatus to maintain and utilize mobile power profile information
Process for manufacturing ethylene
Method for manufacturing superconducting thin film formed of oxide superconductor having non superconducting region and device utilizing the superconducting thin film