Patent ID: 12248004

In the above figures:1. PCB board;11. Coaxial connector;12. Signal connection point;13. PCB wire;14. Spring structure;15. PCB-end threaded hole;2. Connector;3. Membrane probe head;31. Support;311. Acting surface;312. Connecting surface;32. Membrane;33. Probe;331. Probe base structure;332. Probe tip structure;34. Interconnecting wire;35. Concave supporting structure;351. Concave structure;3511. Concave;352. Supporting elastic layer;3521. Convex insert;353. Supporting rigid body;36. Adhesive layer;37. Elastic component;38. Stiffener;381. Assembly screw holes;382. Leveling screw holes;39. Leveling screw.

Specific Embodiment

With reference to the accompanying drawings and embodiment, the present invention will be described in detail.

Embodiment 1: Refer to FIG.1-6

A membrane probe card consists of a PCB board1, a connector2and a membrane probe head3; the membrane probe head3consists of a support31providing an acting surface311, membrane32covering the acting surface311of the support31, a probe33and an interconnecting wire34arranged on the membrane32.

PCB board1is a multi-layer epoxy resin circuit board, on which coaxial connector11and signal connection point12are distributed, and PCB wire13is distributed inside, which respectively connects coaxial connectors11to corresponding signal connection points12to realize electrical signal transduction and transmission; the PCB board1is also distributed with spring structure14and PCB-end threaded hole15on its surface; the center of PCB board1is hollowed out to accommodate the membrane probe head3; the spring structure14is located at the outer circumference of the central hollow part of the PCB board1and is used to realize the close connection with the membrane probe head3.

The support31is a rigid body, wherein it has a convex protruding downward in the middle and the lower surface of the convex is used as the acting surface311. A connecting surface312is arranged on the periphery of the convex of the support31to contact against the PCB board1, and the connecting surface312is also covered by the membrane32, and a probe33is also arranged at the membrane32corresponding to the connecting surface312, and the probe33is used for docking with the PCT board1.

A concave supporting structure35is arranged between the acting surface311of the support31and the membrane32; the concave supporting structure35comprises a concave structure351and a supporting elastic layer352, and the concave structure351comprises several concaves3511fixedly distributed relative to the acting surface311, the concaves3511are arranged towards the probe33and correspond to the probes respectively and the concaves3511are eccentric with the projections of the corresponding probes33on the acting surface311; the supporting elastic layer352is embedded between the concave structure351and the membrane32, and the supporting elastic layer352is provided with convex insert3521relative to each concave3511the concave structure351, and the convex insert3521of the supporting elastic layer352is embedded in the corresponding concave; so in this way, the two parts of the supporting elastic layer352which are divided by the probe33have a thickness difference Δt (FIG.5). In particular, as shown inFIG.5, there is a thickness difference Δt between the thickness of the supporting elastic layer352(including the convex insert3521) on one side of an axis A of the probe33in the extension direction of the supporting elastic layer352and the thickness of the supporting elastic layer352on the opposite side of the axis A of the probe33in the extension direction.

Specifically, the concave supporting structure35of the embodiment also comprises a supporting rigid body353, and the supporting rigid body353is fixedly covered on the acting surface311of the support31, and the concave structure351is arranged on the lower surface of the supporting rigid body351. The supporting rigid body353can be made from high temperature resistant hard materials such as silicon, glass and PMMA, and the concave structure351can be processed by corrosion process.

Specifically, the upper surface of the supporting elastic layer352is conformal to the surface of supporting the rigid body353and completely fills in the concave structure351, while the lower surface of the supporting elastic layer352is parallel to the acting surface311. The supporting elastic layer352has a certain thickness relative to the surface of the supporting rigid body353, and the thickness of the supporting elastic layer352on two sides of the wall edge of the concave3511is different. The supporting elastic layer352is made from flexible materials such as PDMS and silica gel, etc, and the elasticity can be adjusted by adjusting the material ratio and curing temperature, so as to realize the absorption and compatibility of slightly height difference between the tested chip Pad or probe structure.

Specifically, the membrane32can be fixedly covered on the supporting elastic layer352through the adhesive layer36.

Specifically, the vertical section of the concave is column-shaped or truncated-shaped groove, and the figure shows the truncated-shaped one. And the projection of the probe33in the up-down direction is across the outer contour line of the corresponding concave.

In order to generate the measuring slip for the probe butted with the PCB board1, the concave supporting structure35is also arranged between the connecting surface312of the support31and the membrane32, and the supporting elastic layer352in the concave supporting structure35is embedded between the connecting surface312and the membrane32. The specific structure of the concave supporting structure35is the same as the concave supporting structure35between the acting surface311of the support31and the membrane32, which will not be repeated here.

The probe33specifically consists of a probe base structure331and a probe tip structure332. The probe tip structure332is located on the probe base structure331. The probe base structure331can be rectangular, cylindrical, prismatic, etc., and can be made from rhodium, Ni or PD-Ni, Ni—B alloy and other high-hardened materials. The probe tip structure can be the shape of truncated pyramid or trustum, cone, etc., and can be made from wear-resistant materials such as rhodium, Ni or PD-Ni, Ni—B alloy.

A stiffener38is also arranged above the support31, and the stiffener38is a metal plate with a concave area in the center, and it's equipped with assembly screw holes381and leveling screw holes382. Its edge is connected with the support31and the central concave area is used to accommodate elastic component37and the elastic component37can be an elastomer structure such as an air bag and a multi-pawl spring. As shown in the figure, the elastic component37is an air bag. The leveling screw39is located in the leveling screw hole382, and the bottom is in contact with the upper surface of the elastic component37. Adjusting the relative position of several leveling screws39can realize the correction of the inclination between the stiffener38and the support31.

The elastic component37is located between the stiffener38and the support31. During the test, the elastic component37is in a compressed state. When OD is applied, the elastic component37can undergo elastic deformation and absorb the displacement in the vertical direction.

During the test: In the initial state as shown inFIG.5, the probe33doesn't contact the tested chip Pad, the elastic component37is in the initial compression state, and the supporting elastic layer352is in the uncompressed state; with the application of test OD as shown inFIG.6, the probe contacts the tested chip Pad and displaces in the vertical direction, and most of the displacement is absorbed by the elastic component37, and the rest is absorbed by the probe33and the concave supporting structure35together; due to the different thickness of the supporting elastic layer352on two sides of the probe33, the probe33inclines slightly while moving vertically, resulting in the slippage with the distance of L, which can push away the dirt and oxide on the surface of the tested chip and achieve a more stable electrical connection.

Embodiment 2: Refer to FIG.1-6

A membrane probe head consists of a support31providing an acting surface311, membrane32covering the acting surface311of the support31, a probe33and an interconnecting wire34arranged on the membrane32. The specific structure is the same as that of the membrane probe head in embodiment 1, which will not be repeated here.

Embodiment 3: Refer to FIGS.1,2,7and8

A membrane probe card consists of a PCB board1, a connector2and a membrane probe head3; the membrane probe head3consists of a support31providing an acting surface311, membrane32covering the acting surface311of the support31, a probe33and an interconnecting wire34arranged on the membrane32.

The difference from embodiment 1 is that the probes33are in a straight row, and the concave3511is not a groove, but a half of the supporting rigid body353is concave upward, that is, the supporting rigid body353is half thick and half thin, and the thin side forms the concave3511, as shown inFIG.7, while a row of probes33is correspondingly located across the walls of the concaves3511, as shown inFIG.8. The shape of the supporting elastic layer352matches with the lower surface of the supporting rigid body353, which also generates the thickness difference of the part on two sides of the probe33on the supporting elastic layer35to achieve the effect of measuring slip for the probe33as in the embodiment.

The others are the same as those in the embodiment 1 and will not be repeated herein.

The above embodiments are used as examples, and the following practical changes can be made in practice:1. The concave3511can be a groove according to embodiment 1 or a thinned part according to embodiment 3. The quantity and shape of the concaves3511can be adjusted according to the actual quantity and distribution of the probes33;2. The concaves need to correspond to the probes. Here, one concave can correspond to one probe, or one concave can correspond to several probes;3. The supporting rigid body353can be removed and not used, but the concave structure351can be directly arranged on the acting surface311of the support31;4. The adhesive layer36between the membrane32and the supporting elastic layer352can also be removed. The membrane32can be fixed relative to the lower surface of the supporting elastic layer352in other ways, or not fixed but only tightened against the lower surface of the supporting elastic layer352.

It should be noted that the above described embodiments are only for illustration of technical concept and characteristics of present invention with purpose of making those skilled in the art understand the present invention, and thus these embodiments shall not limit the protection range of present invention. The equivalent changes or modifications according to spiritual essence of present invention shall fall in the protection scope of present invention.