Patent ID: 6156078
Filing Date: 2000-12-05
Classification: G01R,H01L

Abstract:
A method of testing, marking, sorting and packing different classifications of integrated circuit package units (ICPUs) that are initially enclosed in carrier tubes comprising,a) automatically positioning carrier tubes containing ICPUs in a position that locates the ICPUs in a dead bug orientation,b) automatically moving the carrier tubes with the ICPUs in the previously positioned dead bug orientation to a conditioning station,c) automatically unloading the ICPUs from the carrier tubes at the conditioning station in the dead bug orientation such that the ICPUs are unenclosed, and automatically conditioning the individual, unenclosed ICPUs with heat,d) automatically transporting the conditioned ICPUs, while unenclosed and in the dead bug orientation, from the conditioning station to an environmental test station and automatically testing the electrical parameters of the conditioned ICPUs at the environmental test station while the ICPUs are in the dead bug orientation,e) automatically cooling the conditioned and unenclosed ICPUs while the ICPUs are in the dead bug orientation and automatically transporting the cooled ICPUs, while the ICPUs are unenclosed and in the dead bug orientation, from the environmental test station to an ambient temperature test station,f) automatically testing the cooled ICPUs at the ambient temperature test station for quality assurance while the ICPUs are unenclosed and in the dead bug orientation and thereafter automatically transporting the quality tested ICPUs, while unenclosed and in the dead bug orientation, from the ambient temperature test station to an orientation station,g) automatically orienting the quality tested ICPUs at the orientation station while the ICPUs are unenclosed, from the dead bug orientation to a live bug orientation and automatically transporting the ICPUs while unenclosed and in the live bug orientation from the orientation station to a degreasing station,h) automatically degreasing the ICPUs at the degreasing station while the ICPUs are unenclosed and in the live bug orientation and automatically transporting the degreased ICPUs, while the ICPUs are unenclosed and in the live bug orientation, from the degreasing station to a marking station,i) providing a set of markers at the marking station, such that each marker in the set has different classification indicia corresponding to each different classification of the ICPUs and automatically marking the degreased ICPUs at the marking station while the ICPUs are unenclosed and in the live bug orientation, with a classification indicia that corresponds to the classification of the ICPU, and automatically transporting the marked ICPUs, while the ICPUs are unenclosed and in the live bug orientation, from the marking station to an ultraviolet station,j) automatically heating the marked ICPUs at the ultraviolet station while the ICPUs are unenclosed and in the live bug orientation, using an ultraviolet source, and automatically transporting the heated ICPUs, while the ICPUs are unenclosed and in the live bug orientation, from the ultraviolet station to a lead straightening station,k) automatically scanning all the ICPUs at the lead straightening station while the ICPUs are unenclosed and in the live bug orientation, for any bent leads and automatically straightening any bent leads of the ICPUs while the ICPUs are in the live bug orientation, and automatically transporting the ICPUs, while the ICPUs are unenclosed and in the live bug orientation, from the lead straightening station to a binning, buttoning and packing station,l) at the binning, buttoning and packing station, automatically segregating ICPUs of common classification while the ICPUs are unenclosed and automatically loading the ICPUs of common classification into empty tubes that are buttoned at one end and automatically buttoning the other end of the tubes when they are loaded with ICPUs of common classification, andm) linking the conditioning station, the environmental test station, the ambient temperature test station, the orientation station, the degreasing station, the marking station, the ultraviolet station, the lead straightening station and the binning, buttoning and packing station together in a continuous cooperative assembly to permit the unenclosed ICPUs to be transported automatically from station to station and integrating all individual operations to form a completely integrated auto testing and finishing system that enables the ICPUs to be automatically transported, while unenclosed, from station to station such that the automated linking of stations eliminates manual loading and unloading of ICPUs at each station.