Resources Contact Us Home
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
Triple-trim reference voltage generator
Antenna device and wireless communication apparatus
System and method for solving connection violations
Hydrofluorocarbon refrigerant compositions for heat pump water heaters
Methods and system for displaying segmented images
Display apparatus, control method thereof, and program
System and method for seamlessly increasing download throughput
  Randomly Featured Patents
Reticle-focus detector, and charged-particle-beam microlithography apparatus and methods comprising same
Fluid ejection devices and methods for forming such devices
Semiconductor mounting substrate and method for manufacturing the same
Implantable short resistant lead
Method of milling the Portland clinker for the production of gypsumless Portland cements
Brushless DC motor
Adaptable injection molding installation mounting arrangement
Iron complexes for bleach activation and stereospecific oxidation
Frame counter for synchronized communication
Inside diameter, outside diameter and wall tube gage