Abstract:
A vertical-type probe card includes a circuit board, which has signal circuits and grounding circuits arranged in such a manner that each signal circuit is disposed in parallel and adjacent to one grounding circuit and kept a predetermined distance from the grounding circuit, and a probe assembly, which is arranged at the bottom side of the circuit board and has an upper guide plate, a lower guide plate, a conducting layer provided on the lower guide plate, a plurality of signal probes respectively electrically connected to the signal circuits and adjacent to a plurality of compensation probes, and at least one grounding probe electrically connected to the grounding circuits in a manner that the signal, compensation and grounding probes are vertically inserted through the upper and lower guide plates, and the conducting layer is conducted with the compensation probe and the grounding probe while electrically insulated to the signal probe.
Abstract:
A high-frequency probe card includes a circuit board having signal circuits and grounding circuits, transmission lines each having a bi-wire structure including a first lead wire for transmitting high-frequency signal and a second lead wire connected to the grounding circuits, and signal probes. High-frequency test signal provided by a test machine to the signal circuits can be transmitted to the signal probes through the first lead wires. Since the grounding circuits and second lead wires are provided adjacent to the signal circuits and first lead wires respectively, the high-frequency signal can be efficiently transmitted and the characteristic impedance matching can be maintained during high-frequency signal transmission. The bi-wire structure of the transmission lines has a diameter equal to or less than 1 millimeter, thereby allowing installation of a big number of the transmission lines such that the high-frequency test for a big number of electronic elements can be realized.
Abstract:
A method for making a guide panel for a vertical probe card in batch includes the steps of a) preparing a non-metal substrate, b) forming a shielding layer having a plurality of openings on the substrate, c) etching a part of the substrate corresponding to the openings of the shielding layer by an anisotropic etching so as to form bind holes with a predetermined depth on the substrate, d) grinding the substrate to open the blind holes by a back side thinning technology so as to form micro feed through holes on the substrate, and e) removing the shielding layer so as to obtain the desired guide panel.
Abstract:
An apparatus for microdrop vitrification has a tank and two wings. The tank has a bottom, two side edges, two top edges, two sidewalls, a lowest bottom, a drain and a spout. The drain is defined in one of the sidewalls at the bottom of the tank. The spout is mounted on the bottom of the tank and is connected to the drain. The wings are integrally formed respectively with and extend out from the top edges. The present invention also relates to a microdrop forming device, a method for microdrop vitrification and a method for recovering vitrified cells.
Abstract:
An injection molding apparatus has a barrel for conveying a molten substance, a screw, a first base for supporting the barrel, a power unit, a second base for supporting the power unit, links, a motor, a screw driver, a plurality of injection guide links, and an injection connecting plate. The first base is threadedly secured to the bed. The barrel has one end secured to the first base. The power unit is fixed on the second base. The links each have one end connected to the first base and the other end connected to the second base. The screw driver between the bases is moved under the guidance of the injection guide links. The injection guide links penetrate through the second base, having one end secured to the screw driver with the injection connecting plate provided in the second base. The injection connecting plate is pivotably secured to the power unit. These features are adopted to the deformation caused by heat, and provide a closed loop of force, isolation of deformation, and a modular design that is particularly suitable to high speed injection molding.