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
Method and system of extending battery life of a wireless microphone unit
Administrable compositions
Philanthropy management apparatus, system, and methods of use and doing business
Method and system for dynamic storage tiering using allocate-on-write snapshots
Methods of forming integrated circuit packages
Method and apparatus for reducing cost of optical amplification in a network
Direct converting apparatus, method for controlling the same, and control signal generation device
  Randomly Featured Patents
Water filtering device
Rate limiting data traffic in a network
Disc brake
Joint for envelope of vacuum type electrical device
Targeted chromosomal genomic alterations with modified single stranded oligonucleotides
Process for sulfurization or presulfurization of solid particles of a catalyst or an adsorbent
Interleaving order generator, interleaver, turbo encoder, and turbo decoder
System and method for runtime interface versioning
Systems and methods of marking large objects as non-cacheable
Method of generating optical radiation, and optical radiation source