Abstract:
A probe apparatus is provided with a number of space transformer segments that are fixated such that probe offset due to warping is kept to a minimum. In a first embodiment, the space transformer segments are permanently fixated. In a second embodiment the space transformer segments are included together with correspondingly shaped sheath segments in probe modules that may be individually removed from the probe apparatus for a selective maintenance. As a result a large number of chips may be tested simultaneously without reducing the operational cycle interval of the probe apparatus.
Abstract:
This invention presents a method for aligning a set of probes in a circuit testing apparatus with a set of pads of a circuit under test and the apparatus designed according to this method. The alignment includes the steps of selecting a first group G1 of probes from the set, such that all probes in group G1 have the same tip length L1 and the same beam length L2, and mounting each probe of group G1 on a first mounting block which has a first through-hole for each probe and a first removable portion which includes the first through-hole. During the mounting step the tip portion is placed in the through-hole, the mounting portion is attached to the first mounting block and the first removable portion is discarded. Then, a second mounting block is placed on the first mounting block and a second group G2 of probes selected from the set is mounted it in the same manner as group G1 on the first block. The blocks are aligning on top of each other by using guide holes and positioning holes in conjunction with a corresponding vertical fixing pin and a tiltable positioning pin.
Abstract:
The invention presents a method and a correspondingly designed probe for achieving uniform stress distribution when experiencing deflection. The probe has a top edge, a bottom edge, a tip, and a beam portion defined by selecting an inflection point along the top edge, such that the beam portion is contained between the tip and the inflection point, and the bottom edge below the beam portion is approximately straight, while the curvature of the top edge of the beam portion is fitted to a parabola. The tip has an outer edge, an inner edge, and a point of contact at the location where the outer and inner edges join. The inner edge is approximately straight while the curvature of the outer edge is fitted to a second parabola. The probe is preferably mounted in a support structure having a groove for receiving the probe such that the beam portion is free to move vertically in the groove and constrained laterally to prevent side-buckling.
Abstract:
An embodiment of the present invention is a probe membrane with a center contact bump area and a plurality of signal connection sections separated by triangular reliefs in the membrane and terminating in a tangential row of contacts for wire bonding to a probe card. The system of triangular reliefs in the membrane allows the membrane to be puckered up such that the center contact bump area is raised approximately ninety mils above the general plane of the probe card. When the membrane has been fixed in its puckered up position, the triangular reliefs in the membrane form several radial rectangular slits. A translator gimbal attached to the center of the membrane provides stability and contact force for the contact bumps to a DUT. Areas of transparency in the vicinity of the contact bump area allows a user to view the I/O pads of a DUT for alignment with the contact bumps in the membrane.