Chip screening board fixture, chip testing device and fixture

Abstract

The present application provides a fixing device, a chip testing device and a fixing fixture for a chip screening board, wherein the fixing device comprises: a screening board fixture, provided with a first mounting member; a screening board, with a chip test socket mounted on the upper surface, the screening board being provided with a signal connector, the signal connector being connected to a chip tester via a signal cable; a detachable first fixing fixture and a second fixing fixture, wherein: the first fixing fixture is provided with the second mounting member, the fixing fixture is fixedly connected to the screening board fixture by using the first mounting member and the second mounting member corresponding to each other; the second fixing fixture has a cable fixing structure, the cable fixing structure is used to fix the signal cable and guide the signal cable to be routed along a predetermined path. The fixing device can effectively reduce the overall area of ​​the screening board, reduce costs, and improve the stability of the signal connector.

Description

Technical Field

[0001] The invention relates to the field of chip testing, and in particular to a fixing device for a chip screening plate, a chip testing device and a fixing fixture. Background Art

[0002] The chip testing system generally includes a screening board, a chip tester, and a sorting machine. Among them, the screening board is a circuit board used to test the chip to be tested, which provides an interface for connecting the chip to be tested with the testing equipment (such as a chip tester). The chip tester is mainly used for circuit testing. By collecting the output signal of the chip to be tested, it determines whether the function and performance of the chip to be tested meet the design specification requirements. The role of the sorting machine in the chip testing system is to automatically transfer the chip to be tested to the test station, and after the test is completed, the tested chips are marked, classified, and collected according to the test results. Usually, the screening board and the sorting machine need to be installed together during testing, and the corresponding detection work is automatically completed through programming and hardware robotic arms to improve production efficiency, reduce manual intervention, and ensure the yield rate.

[0003] At present, the chip tester and the sorter need to use the screening board and the chip test socket installed on the screening board to lead out the channels to be tested and other channel signals. In the chip test system, stable signal transmission is particularly important. Among them, when the cable connects the chip to be tested and the test equipment (chip tester), it is necessary to maintain good electrical performance and mechanical stability to ensure the accuracy and reliability of the test results.

[0004] In the prior art, a chip test socket is usually installed on the upper surface of the screening board, and then the screening board and the screening board fixture are installed together by fastening components (e.g., screws) using corresponding mounting holes on the screening board and the screening board fixture, so that the chip test socket installed on the upper surface of the screening board is fastened to the screening board fixture. A signal connector, such as a Super Miniature Push-On (SMP) connector, is installed on the lower surface of the screening board. The SMP connector is vertically installed on the lower surface of the screening board and is connected to a chip tester through a cable led out in a direction perpendicular to the lower surface of the screening board, thereby transmitting the test path signal to the chip tester.

[0005] As the number of channels of chips increases and their functions become more powerful, the number of probes of the chip test seat also increases. In order to achieve the recommended stroke of the chip test seat probe, the pressure applied to the chip test seat by the sorting machine through the screening plate also increases, which easily causes the screening plate to deform, thereby forming a gap between the screening plate and the chip test seat, which becomes a leakage channel for the high-frequency signal of the probe, resulting in a decrease in isolation. In order to reduce the deformation of the screening board, high requirements are placed on the thickness and plate strength of the screening board, and expensive multi-layer printed boards are usually required to achieve this. However, in the prior art, since the mounting holes are directly set on the screening board and the screening board fixture is directly installed, the area of ​​the screening board is large, but the actual area used for the printed circuit is much smaller than the total area of ​​the screening board, and the effective utilization rate of the screening board is low, resulting in waste; in addition, the screening board adopts a hoisting installation structure, the heat dissipation of the entire board is uneven, and the stability of the test data is poor.

[0006] In addition, the SMP connector is installed vertically on the lower surface of the screening board, and the cable with one end connected to the SMP connector is led out in a direction perpendicular to the lower surface of the screening board. In a high-vibration environment, the above connection method will cause the stability of the SMP connector to decrease due to stress on the cable; and the SMP connector needs to perform impedance matching with the contact points of the screening board, which has high requirements on the processing accuracy and lamination of the screening board, further increasing the procurement cost of the screening board. Summary of the invention

[0007] The present application provides a chip screening board fixing device, a chip testing device and a fixing fixture, which can effectively reduce the overall area of ​​the screening board, reduce costs, and improve the stability of the signal connector.

[0008] The first aspect of the present application discloses a fixing device for a chip screening board, comprising: a screening board tooling fixture, provided with a first mounting piece; a screening board, a chip test seat mounted on the upper surface, the chip test seat being used to place a chip to be tested, the screening board being provided with a signal connector, the signal connector being connected to a chip tester via a signal cable; a detachable first fixing fixture and a second fixing fixture, wherein: the first fixing fixture is provided with a second mounting piece, the second mounting piece corresponds to the first mounting piece, and the lower surface of the screening board is fixed to the first fixing fixture; the fixing fixture is fixedly connected to the screening board tooling fixture by using the first mounting piece and the second mounting piece corresponding to each other; the second fixing fixture has a cable fixing structure, and the cable fixing structure is used to fix the signal cable.

[0009] In the fixing device disclosed in the present application, the second mounting member is arranged on the first fixing fixture, and the screening board and the chip test seat mounted thereon are fastened to the screening board fixture by the first fixing fixture, so there is no need to set mounting holes corresponding to the screening board fixture on the screening board, so that the screening board can be used for printing the test circuit, effectively reducing the overall area of ​​the screening board and reducing the cost; and the screening board does not need to bear the mechanical stress of installation, and the screening board is not easy to deform. In addition, by splitting the fixing fixture into two parts, namely the first fixing fixture and the second fixing fixture, the first fixing fixture is used to support and fasten the screening board, and the second fixing fixture is used to fix the signal cable (such as the RF cable) led out from the screening board. By adopting this multi-level fixing method, the RF cable can be fixed at different positions, thereby dispersing the stress on the RF cable and dispersing the heat of the screening board.

[0010] In the first aspect of the present application, a signal connector is installed on the side end of the screening board, and the signal connector leads one end of the signal cable along the plane direction of the screening board, and the other end of the signal cable is connected to the chip tester. By installing the signal connector on the side end of the screening board, a larger operating space for the signal cable can be provided, thereby providing better mechanical stability and higher frequency performance, especially in an environment with greater vibration or mechanical stress, and can to a certain extent avoid bending, twisting or loosening of the signal cable due to external force, thereby ensuring the stability of the connection; and by providing a cable fixing structure for fixing the signal cable on the second fixing fixture, the influence of stress on the RF cable can be further reduced, thereby further improving the stability of the connection.

[0011] In the first aspect of the present application, the first fixing fixture includes a central support structure, an outer frame structure, and a first cantilever, the central support structure and the outer frame structure are integrally connected through the first cantilever, the space between the central support structure and the outer frame structure is hollow, the central support structure is used to fix the screening plate, and the second mounting member is arranged on the outer frame structure or the first cantilever. By setting the first fixing fixture as a hollow structure, the weight of the structural member can be reduced, and at the same time, an operating space for installing a signal cable can be reserved, which facilitates the installation operation of the signal cable and is conducive to heat dissipation.

[0012] In the first aspect of the present application, the central support structure, the outer frame structure and the second fixing fixture have a shape corresponding to the screening board; the screening board is in the shape of a polygon, the number of sides of the polygon is greater than or equal to 5, and each angle of the polygon is greater than 90 degrees; the signal connector is installed on at least part of the side of the screening board. By setting the central support structure to a shape corresponding to the screening board, the central support structure can better support the screening board and evenly bear the force. In addition, by setting the screening board to a polygonal shape, the shape of the screening board can be flexibly designed according to the number of channels of the chip. Compared with a square, a polygonal shape is closer to a circle, so that the distance between different sides of the polygonal shape and the center of the polygonal shape is closer. The chip test seat is generally located in the center of the screening board, thereby meeting the equal length and equal phase design requirements of the signal cables of different channels and the chip test seat, and the impedance matching of the signal cables of different channels is more consistent, so that the multi-channel loss is consistent, which is convenient for calibration.

[0013] In the first aspect of the present application, at least part of the sides of the outer frame structure include the cable fixing structure, and the position and number of the cable fixing structure correspond to the position and number of the signal connector. By arranging the cable fixing structure on the outer frame structure of the first fixing fixture, it cooperates with the cable fixing structure on the second fixing fixture, so that the signal cable can be better fixed.

[0014] In the first aspect of the present application, the side of the screening board facing the first fixing fixture has a circuit structure; the central support structure includes an avoidance hole to avoid the circuit structure. In order to better fix the screening board to the screening board fixture and make the chip test socket fit to the lower surface of the screening board fixture, some larger circuit components are arranged on the side of the screening board facing the first fixing fixture. Furthermore, an avoidance hole is arranged on the central support structure of the first fixture, which can avoid the circuit structure and also play a role in limiting the screening board.

[0015] In the first aspect of the present application, the second fixing fixture is a frame structure, which is arranged on the periphery of the first fixing fixture and is detachably connected to the outer frame structure of the first fixing fixture through a second cantilever. By designing the second fixing fixture to be detachable from the first fixing fixture, the mechanical stress on the signal cable during use can be effectively reduced, and the cable can be prevented from being unstable or broken due to pulling, bending or twisting.

[0016] In the first aspect of the present application, the cable fixing structure includes an upwardly protruding flange, a groove or a through hole is provided on the flange, and the groove or the through hole is used to fix the signal cable.

[0017] In the first aspect of the present application, a flexible material is provided in the groove or on the inner wall of the through hole for absorbing stress. By providing a flexible material, such as a rubber plug or a rubber ring, in the groove or on the inner wall of the through hole, and introducing the flexible material into the fixing structure, the stress on the signal cable can be effectively absorbed, for example, when the test system shakes, the signal cable can be better fixed.

[0018] In the first aspect of the present application, the first mounting member and the second mounting member are both mounting holes, and the first mounting member and the second mounting member are fixedly connected by a fastening component.

[0019] The second aspect of the present application discloses a chip testing device, comprising: the fixing device disclosed in the first aspect of the present application; a chip testing machine, used to test the chip to be tested, and a signal cable is connected to the chip testing machine.

[0020] The third aspect of the present application discloses a fixing fixture for fixing a screening board to a screening board tooling fixture, the fixing fixture comprising a detachable first fixing fixture and a second fixing fixture, wherein: the first fixing fixture is provided with a second mounting piece corresponding to the first mounting piece of the screening board tooling fixture, and the fixing fixture is fixedly connected to the screening board tooling fixture by using the corresponding first mounting piece and the second mounting piece; the lower surface of the screening board is fixed to the first fixing fixture; the second fixing fixture has a cable fixing structure, the cable fixing structure is used to fix a signal cable, and the signal cable is used to lead out the signal of the screening board.

[0021] In the third aspect of the present application, the first fixing fixture includes a central supporting structure, an outer frame structure and a first cantilever, the central supporting structure and the outer frame structure are integrally connected through the first cantilever, the central supporting structure and the outer frame structure are hollow, the central supporting structure is used to fix the screening plate, and the second mounting member is arranged on the outer frame structure or the first cantilever.

[0022] In the third aspect of the present application, the central support structure, the outer frame structure and the second fixing clamp have a shape corresponding to the screening plate; the shape of the screening plate is a polygon, the number of sides of the polygon is greater than or equal to 5, and each angle of the polygon is greater than 90 degrees.

[0023] In a third aspect of the present application, at least part of the sides of the outer frame structure include the cable fixing structure.

[0024] In a third aspect of the present application, the side of the screening plate facing the first fixing fixture has a circuit structure; and the central supporting structure includes an avoidance hole to avoid the circuit structure.

[0025] In a third aspect of the present application, the second fixing fixture is a frame structure, which is arranged on the periphery of the first fixing fixture and is detachably connected to the outer frame structure of the first fixing fixture via a second cantilever.

[0026] In a third aspect of the present application, the cable fixing structure includes an upwardly protruding flange, a groove or a through hole is provided on the flange, and the groove or the through hole is used to fix the signal cable.

[0027] In a third aspect of the present application, a flexible material is provided in the groove or on the inner wall of the through hole for absorbing stress.

[0028] The present application fixes the signal cable through the cable fixing structure on the second fixing fixture, which can achieve the following beneficial technical effects: prevent the signal connector from loosening due to mechanical vibration or impact after long-term crimping and use, thereby ensuring the long-term reliability of the connection; extend the service life of the signal connector and cable, reduce fatigue damage to the signal cable and signal connector, thereby extending their service life, reducing the frequency of maintenance and replacement, protecting the connection points of the signal cable and the signal connector, and avoiding damage to the connection points due to stress concentration; reducing mechanical stress can maintain the optimal shape and position of the signal cable, thereby ensuring the stability and consistency of signal transmission, reducing signal loss and reflection caused by mechanical deformation, reducing the movement and vibration of the signal cable, reducing the impact of external interference on signal transmission, and improving electrical performance; can make the signal cable routing neat and orderly, easy to install and maintain, prevent the signal cable from being accidentally pulled or moved during installation and maintenance, and reduce the risk of misoperation; can reduce the impact of external mechanical stress on the signal connector and screening board, avoid hardware damage caused by excessive stress, and improve safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a chip testing device;

[0030] Figure 2 This is a schematic diagram of the structure of the chip testing device involved in this application;

[0031] Figure 3 It is a structural schematic diagram of the disassembled state of the fixing clamp embodiment involved in the present application;

[0032] Figure 4 It is a structural schematic diagram of the assembled state of the fixing clamp embodiment involved in the present application. DETAILED DESCRIPTION

[0033] The present application is further described below in conjunction with specific embodiments and drawings. It is to be understood that the illustrative embodiments of the present disclosure are only intended to explain the present application, rather than to limit the present application. In addition, for ease of description, only some, but not all, structures or processes related to the present application are shown in the drawings.

[0034] The following specific embodiments illustrate the implementation of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Although the description of the present application will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present application. In order to provide an in-depth understanding of the present application, the following description will include many specific details. The present application can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0035] Unless the context dictates otherwise, the terms "comprising," "having," and "including" are synonymous. The phrase "A / B" means "A or B." The phrase "A and / or B" means "(A and B) or (A or B)."

[0036] It should be understood that although the terms "first", "second", etc. may be used herein to describe various components, units, or data, these components, units, or data should not be limited by these terms. These terms are used only to distinguish one feature from another. For example, without departing from the scope of the exemplary embodiment, a first feature may be referred to as a second feature, and similarly, a second feature may be referred to as a first feature.

[0037] It should be understood that although directional terms such as "up", "down", "left" and "right" may be used here to describe the positional relationship of each component, these directional terms are only used to indicate the directions in the drawings for the convenience of understanding and cannot be used to limit the scope of protection of this application.

[0038] It should be noted that in this specification, like reference numerals and letters denote similar items in the drawings, and therefore, once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings.

[0039] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0040] Figure 1FIG. 1 is a schematic diagram of the structure of a chip testing device. Figure 1 As shown, the chip testing device 100' includes a screening board fixture 10' for mounting a screening board 20'. The screening board fixture 10' is provided with a mounting hole ( Figure 1 The mounting hole is located at the corresponding position of the fastening component 12'). A chip test seat 21' is provided on the upper surface of the screening plate 20', and a mounting hole is also provided on the screening plate 20'. Figure 1 (not shown in the figure, the mounting holes are located at the corresponding positions of the fastening components 12'). The mounting holes on the screening board fixture 10' correspond to the mounting holes on the screening board 20'. The screening board fixture 10' and the screening board 20' are mounted together by the fastening components 12' (for example, screws), so that the chip test socket 21' mounted on the upper surface of the screening board 20' is fastened to the screening board fixture 10'. The central area of ​​the screening board 20' is the area of ​​the printed circuit. In order to fix the screening board 20' with the chip test socket 21' installed together with the screening board fixture 10', the corresponding positions of the fastening components 12' of the screening board 20' need to be used to set mounting holes, resulting in a larger area of ​​the screening board 20'. However, the area actually used for the printed circuit is much smaller than the total area of ​​the screening board 20'. The effective utilization rate of the screening board 20' is low, resulting in waste.

[0041] In addition, a signal connector 22' is installed on the lower surface of the screening board 20' for electrically connecting to the chip test socket 21'. The signal connector 22' can be, for example, a super miniature push-on (SMP) connector. The SMP connector is vertically installed on the lower surface of the screening board 20' and is connected to the chip tester 30' via a signal cable 23' led out in a direction perpendicular to the lower surface of the screening board 20', thereby transmitting the test path signal to the chip tester 30'. In the above prior art signal cable connection method, in a high vibration environment, the stability of the SMP connector will be reduced due to the stress of the cable being vertically downward or vibrating.

[0042] Figure 2 FIG. 1 is a schematic diagram of the structure of the chip testing device involved in this application. Figure 2 As shown, the chip testing device 100 includes a screening board fixture 10 , a screening board 20 , and a fixing fixture 40 .

[0043] The screening plate fixture 10 is provided with a first mounting member ( Figure 2 Not shown in the figure, the first mounting member is located at a position corresponding to the fastening component 12), and is used to be fixedly connected with the fixing fixture 40 to fix the screening plate 20 on the screening plate fixture 10.

[0044] A chip test socket 21 is installed on the upper surface of the screening board 20. A printed circuit is arranged inside the screening board 20 for inputting test signals to the chip test socket 21 and extracting signals from the chip test socket 21. The chip test socket 21 is used to place the chip to be tested and to be electrically connected to the chip to be tested. The chip to be tested can be any type of chip, including but not limited to a processor chip (CPU), a graphics processing chip (GPU), a memory chip (for example, a random access memory chip (RAM) and a read-only memory chip (ROM)), a communication chip (for example, a baseband chip, a radio frequency chip, a Bluetooth chip, and a WiFi chip). In an embodiment of the present invention, the chip to be tested is a radio frequency chip, but it should be easily understood that this cannot be used to limit the scope of protection of the present application. A signal connector 22 is also installed on the side end of the screening board 20. The side end of the screening board 20 refers to any side of the screening board 20 other than the upper and lower surfaces. It can be understood that the side end of the screening board 20 refers to any side in the thickness direction of the screening board 20. The signal connector 22 connects one end of the signal cable 23 along the plane direction of the screening board 20 (i.e. Figure 2 The signal connector 22 is connected to the chip tester 30, thereby transmitting the test signal of the RF chip to be tested to the chip tester 30 for signal testing. The signal connector 22 can adopt an SMA (Sub-Miniature-A) connector, which is a miniaturized coaxial connector. It has the advantages of wide bandwidth, low loss, good characteristic impedance matching, stable connection, strong durability, etc., and can provide a stable signal connection. However, the present application is not limited to SMA connectors, and other types of signal connectors that can be side-mounted can also be used.

[0045] By installing the signal connector 22 on the side end of the screening plate 20, a larger operating space for the signal cable 23 can be provided, thereby providing better mechanical stability and higher frequency performance, especially in an environment with greater vibration or mechanical stress. It can avoid bending, twisting or loosening of the signal cable 23 due to external force to a certain extent, thereby ensuring the stability of the connection.

[0046] The fixing fixture 40 has a detachable structure, including a detachable first fixing fixture 41 and a detachable second fixing fixture 42. The first fixing fixture 41 is provided with a second mounting member ( Figure 2(not shown in the figure, the second mounting member is located at the position corresponding to the fastening member 12), the second mounting member and the first mounting member on the screening board fixture 10 correspond to each other in position, and the first fixing fixture 41 is fixedly connected to the screening board fixture 10 by using the first mounting member and the second mounting member corresponding to each other in position, and the first mounting member and the second mounting member are both mounting holes, and the first fixing fixture is fixedly connected to the screening board fixture 10 by using the fastening member 12 passing through the mounting hole, so that the chip test seat 21 installed on the screening board 20 is attached to the screening board fixture 10. The first mounting member and the second mounting member can both be mounting through holes, and the fastening member 12 can be a screw and a nut, and the screw passes through the mounting through hole and cooperates with the nut to complete the fixed connection; the first mounting member and the second mounting member can also be a mounting through hole on one side and a mounting hole with internal threads on the other side, and the screw passes through the mounting through hole on one side and cooperates with the internal threads of the mounting hole on the other side to complete the fixed connection.

[0047] The area of ​​the first fixing clamp 41 can be larger than the area of ​​the screening plate 20. The lower surface of the screening plate 20 is fixed to the first fixing clamp 41. It can be fixed by screws or by corresponding slots and buckles. For example, a raised buckle corresponding to the edge size of the screening plate 20 is provided on the first fixing clamp 41, and a slot matching the buckle is provided at the corresponding position of the side end of the edge of the screening plate 20. The specific fixing method is not limited in this application.

[0048] The second fixing fixture 42 is fixedly connected to the first fixing fixture 41 through the third mounting member 416. The second fixing fixture 42 has a cable fixing structure 43, which is used to fix the signal cable 23 so that the signal cable 23 can extend in a horizontal direction, thereby guiding the signal cable 23 to be routed along a predetermined path.

[0049] In this embodiment, the second mounting member is arranged on the first fixing fixture 41, and the screening board 20 and the chip test seat 21 mounted thereon are fastened to the screening board fixture 10 by the first fixing fixture 41, so there is no need to set mounting holes corresponding to the screening board fixture 10 on the screening board 20, so that the screening board 20 can be used for printing the test circuit, effectively reducing the overall area of ​​the screening board and reducing the cost; and the screening board 20 does not need to bear the mechanical stress of installation, and the screening board is not easy to deform. In addition, by splitting the fixing fixture 40 into two parts, namely the first fixing fixture 41 and the second fixing fixture 42, the first fixing fixture 41 is used to support and fasten the screening board 20, and the second fixing fixture 42 is used to fix the signal cable (such as the radio frequency cable) led out from the screening board 20. By adopting this multi-level fixing method, the radio frequency cable can be fixed at different positions, thereby dispersing the stress on the radio frequency cable and dispersing the heat of the screening board 20. Furthermore, by providing a cable fixing structure 43 for fixing the signal cable 23 on the second fixing fixture 42 , the stress effect on the signal cable 23 can be further reduced, and the connection stability can be further improved.

[0050] Figure 3 It is a structural schematic diagram of the disassembled state of an embodiment of the fixing clamp involved in the present application. Figure 3 The first fixing fixture 41 is shown on the left side. The first fixing fixture 41 has a hollow structure, which includes a central supporting structure 411 whose center is in contact with the screening plate 20, an outer frame structure 412 and a first cantilever 413. The central supporting structure 411 and the outer frame structure 412 are integrally connected together through the first cantilever 413.

[0051] The central support structure 411 is used to fix the screening plate 20. In order to provide uniform support force for the screening plate 20, the central support structure 411 has a shape corresponding to the screening plate 20. In this embodiment, the screening plate 20 and the central support structure 411 are both octagons. The central support structure 411 also has an avoidance hole 414, which is a hollowed-out part dug out on the central support structure. Nowadays, the integration of chips is constantly improving, and the chip size is getting thinner and smaller, so the thickness of the chip test seat is also relatively thin. In order to fit the chip test seat 21 on the screening plate 20 to the screening plate fixture 10 and ensure the stability of the installation, some circuit structures including larger circuit devices, such as thicker resistors, capacitors, power connectors and other devices, are arranged on the lower surface of the screening plate 20. The avoidance hole 414 on the central support structure 411 is used to avoid the above-mentioned circuit structure, and can also play a limiting role when the screening plate 20 is installed on the central support structure 411.

[0052] By configuring the first fixing fixture 41 to be a hollow structure, the weight of the structural component can be reduced, and at the same time, an operating space for installing the signal cable 23 can be reserved, which facilitates the installation operation of the signal cable 23 and is beneficial to heat dissipation.

[0053] The outer frame structure 412 is arranged on the periphery of the central support structure 411. The outer frame structure 412 also has a shape corresponding to the central support structure 411 and the screening plate 20, and is also an octagon in this embodiment. The outer frame structure 412 is provided with a second mounting member 415 for fixedly connecting with the screening plate fixture 10, and a third mounting member 416 for fixedly connecting with the second fixing fixture 42. The first cantilever 413 is integrally arranged between two corresponding edges of the central support structure 411 and the outer frame structure 412, so as to connect the central support structure 411 and the outer frame structure as a whole. For the stability of the connection, it is preferred that the first cantilever has at least three. Although the second mounting member 415 is arranged on the outer frame structure 412 in this embodiment, the second mounting member 415 can also be arranged on the first cantilever 413.

[0054] In this embodiment, the central support structure 411, the outer frame structure 412 and the first cantilever 413 of the first fixing fixture 41 are integrally formed structures, but the present invention is not limited thereto. In other possible embodiments, the central support structure 411 and the outer frame structure 412 of the first fixing fixture 41 may also be separate structures, and are connected together by fastening components through the first cantilever 413 and the corresponding mounting holes. The first fixing fixture of the present invention is also not limited to a hollow structure, and the first fixing fixture may also be a whole piece structure, such as a whole piece of square plate, and more preferably a polygonal plate having a shape corresponding to the screening plate.

[0055] Figure 3The second fixing fixture 42 is shown on the right. The second fixing fixture 42 is a frame structure. The second fixing fixture 42 is arranged on the outer periphery of the first fixing fixture 41. The second fixing fixture 42 also has a shape corresponding to the screen 20, and is also an octagon in this embodiment. The second fixing fixture 42 is integrally provided with a second cantilever 421, and a fourth mounting member 422 is provided on the second cantilever 421. The fourth mounting member 422 corresponds to the third mounting member 416 and can be fixedly connected by fasteners, thereby fixing the first fixing fixture 41 and the second fixing fixture 42. The second fixing fixture 42 has a cable fixing structure 43. The cable fixing structure 43 is an upwardly protruding flange on the frame structure, and a groove is provided on the flange. The position and number of the grooves correspond to the position and number of the signal connector 22 installed on the side end of the screening plate 20. The signal cable 23 is clamped in the corresponding groove, thereby achieving the purpose of fixing the signal cable 23. In this embodiment, the cable fixing structure 43 is a groove, but the present application is not limited thereto. For example, in other possible embodiments, the cable fixing structure 43 may also be a through hole provided on the flange.

[0056] By designing the second fixing clamp 42 and the first fixing clamp 41 to be detachable, the mechanical stress on the signal cable 23 during use can be effectively reduced, preventing the signal cable 23 from being unstable or broken due to pulling, bending or twisting.

[0057] In this embodiment, the second fixing clamp 42 is a frame structure, but the present invention is not limited to this. The second fixing clamp can also be a whole piece structure with an area larger than the first fixing clamp, for example, a whole piece of square plate that is larger than the first fixing clamp, and more preferably, a polygonal plate having a shape corresponding to the screening plate and the first fixing clamp.

[0058] As mentioned above, the central support structure 411, the outer frame structure 412 and the second fixing fixture 42 all have a shape corresponding to the screening board 20, which is an octagon in this embodiment, but the present application is not limited thereto. The shape of the screening board 20 can be any polygon with a side number greater than 5, and each angle of the polygon is greater than 90 degrees. The polygon can be a regular polygon, but it can also be a polygonal shape close to a regular polygon. The number of sides and shape of the polygon are determined by the number and position distribution of the signal cables 23 that need to be led out of the screening board 20, and can be a pentagon, hexagon, heptagon, octagon, nonagon, decagon, and the like.

[0059] By setting the central support structure 411 to a shape corresponding to the screening plate 20, the central support structure can better support the screening plate and evenly bear the force. In addition, by setting the screening plate 20 to a polygonal shape, the shape of the screening plate 20 can be flexibly designed according to the number of channels of the chip. Compared with a square shape, a polygonal shape is closer to a circle, so that the distance between the different sides of the polygonal shape and the center of the polygonal shape is closer. The chip test seat 21 is generally located in the center of the screening plate 20, thereby satisfying the equal length and equal phase design requirements of the signal cables 23 of different channels and the chip test seat 21. The impedance matching of the signal cables 23 of different channels is more consistent, so that the multi-channel loss is consistent, which is convenient for calibration.

[0060] In other possible implementations of the present application, a cable fixing structure 43 may also be provided on at least part of the sides of the outer frame structure 412 of the first fixing fixture 41, and the position and number of the cable fixing structure 43 correspond to the position and number of the signal connectors 22. By also providing the cable fixing structure 43 on the outer frame structure 412 of the first fixing fixture 41, it cooperates with the cable fixing structure 43 on the second fixing fixture, so that the signal cable 23 can be better fixed.

[0061] In a possible embodiment of the present application, flexible materials such as rubber plugs or rubber rings can be set in the groove or on the inner wall of the through hole to absorb stress. Introducing flexible materials into the cable fixing structure 43 can effectively absorb the stress on the signal cable 23. For example, when the test system shakes, the signal cable 23 can be better fixed.

[0062] Figure 4 This is a structural schematic diagram of the assembly state of the fixing clamp embodiment involved in the present application, showing the state in which the first fixing clamp 41 and the second fixing clamp 42 are installed together by means of fasteners through the third mounting member 416 and the fourth mounting member 422, the screening plate 20 is installed on the central support structure 411 of the first fixing clamp 41, and the signal cable 23 led out from the screening plate 20 is fixed on the cable fixing structure 43 of the second fixing clamp 42.

[0063] Therefore, fixing the signal cable by the cable fixing structure on the second fixing clamp can achieve the following beneficial technical effects: preventing the signal connector from loosening due to mechanical vibration or impact after long-term crimping and use, thereby ensuring the long-term reliability of the connection; extending the service life of the signal connector and cable, reducing fatigue damage to the signal cable and signal connector, thereby extending their service life, reducing maintenance and replacement frequency, protecting the connection points of the signal cable and signal connector, and avoiding damage to the connection points due to stress concentration; reducing mechanical stress can maintain the optimal shape and position of the signal cable, thereby ensuring the stability and consistency of signal transmission, reducing signal loss and reflection caused by mechanical deformation, reducing the movement and vibration of the signal cable, reducing the impact of external interference on signal transmission, and improving electrical performance; it can make the signal cable routing neat and orderly, facilitate installation and maintenance, prevent the signal cable from being accidentally pulled or moved during installation and maintenance, and reduce the risk of misoperation; it can reduce the impact of external mechanical stress on the signal connector and screening board, avoid hardware damage caused by excessive stress, and improve safety.

[0064] The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be imagined by any technician familiar with the technical field within the technical scope disclosed in the present application should be included in the protection scope of the present application; in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A fixing device for a chip screening plate, characterized in that: The fixing device comprises: The screening plate fixture is provided with a first mounting member; The screening board has a chip test seat installed on its upper surface, and the chip test seat is used to place the chip to be tested; the screening board is installed with a signal connector, and the signal connector is connected to the chip tester through a signal cable; A detachable first fixing fixture and a second fixing fixture, wherein: The first fixing fixture is provided with a second mounting piece, the second mounting piece corresponds to the first mounting piece, the lower surface of the screening plate is fixed to the first fixing fixture, and the area of ​​the first fixing fixture is larger than the area of ​​the screening plate; the first fixing fixture is fixedly connected to the screening plate fixture by using the first mounting piece and the second mounting piece corresponding to each other; The second fixing fixture has a cable fixing structure, and the cable fixing structure is used to fix the signal cable.

2. The fixing device according to claim 1, characterized in that A signal connector is installed at the side end of the screening board. The signal connector leads one end of the signal cable out along the plane direction of the screening board. The other end of the signal cable is connected to a chip tester.

3. The fixing device according to claim 1, characterized in that: The first fixing fixture includes a central supporting structure, an outer frame structure and a first cantilever. The central supporting structure and the outer frame structure are integrally connected through the first cantilever. The central supporting structure and the outer frame structure are hollowed out. The central supporting structure is used to fix the screening plate. The second mounting member is arranged on the outer frame structure or the first cantilever.

4. The fixing device according to claim 3, characterized in that: The central support structure, the outer frame structure and the second fixing fixture have shapes corresponding to the screening plate; The screening plate is in the shape of a polygon, the number of sides of the polygon is greater than or equal to 5, and each angle of the polygon is greater than 90 degrees; The signal connector is installed on at least part of the side of the screening board.

5. The fixing device according to claim 4, characterized in that: At least part of the sides of the outer frame structure include the cable fixing structures, and the positions and number of the cable fixing structures correspond to the positions and number of the signal connectors.

6. The fixing device according to claim 3, characterized in that: The side of the screening plate facing the first fixing fixture has a circuit structure; the central supporting structure includes an avoidance hole to avoid the circuit structure.

7. The fixing device according to claim 3, characterized in that: The second fixing fixture is a frame structure, which is arranged on the periphery of the first fixing fixture and is detachably connected to the outer frame structure of the first fixing fixture via a second cantilever.

8. The fixing device according to any one of claims 1 to 7, characterized in that: The cable fixing structure comprises an upwardly protruding flange, on which a groove or a through hole is arranged, and the groove or the through hole is used to fix the signal cable.

9. The fixing device according to claim 8, characterized in that: A flexible material is arranged in the groove or on the inner wall of the through hole to absorb stress.

10. The fixing device according to any one of claims 1 to 7, characterized in that: The first mounting member and the second mounting member are both mounting holes, and the first mounting member and the second mounting member are fixedly connected by a fastening component.

11. A chip testing device, characterized in that: include: The fixing device according to any one of claims 1 to 10; The chip tester is used to test the chip to be tested, and the signal cable is connected to the chip tester.

12. A fixing fixture, characterized in that: Used to fix the screening plate to the screening plate fixture, the fixing fixture comprises a detachable first fixing fixture and a second fixing fixture, wherein: The first fixing fixture is provided with a second mounting piece, which corresponds to the first mounting piece of the screening plate fixture, and the fixing fixture is fixedly connected to the screening plate fixture by using the first mounting piece and the second mounting piece corresponding to each other; the lower surface of the screening plate is fixed to the first fixing fixture, and the area of ​​the first fixing fixture is larger than the area of ​​the screening plate; The second fixing fixture has a cable fixing structure, and the cable fixing structure is used to fix a signal cable, and the signal cable is used to lead out the signal of the screening board.

13. The fixing fixture according to claim 12, characterized in that: The first fixing fixture includes a central supporting structure, an outer frame structure and a first cantilever. The central supporting structure and the outer frame structure are integrally connected through the first cantilever. The central supporting structure and the outer frame structure are hollowed out. The central supporting structure is used to fix the screening plate. The second mounting member is arranged on the outer frame structure or the first cantilever.

14. The fixing fixture according to claim 13, characterized in that: The central support structure, the outer frame structure and the second fixing fixture have shapes corresponding to the screening plate; The screening plate is in the shape of a polygon, the number of sides of the polygon is greater than or equal to 5, and each angle of the polygon is greater than 90 degrees.

15. The fixing fixture according to claim 14, characterized in that: At least part of the sides of the outer frame structure include the cable fixing structure.

16. The fixing fixture according to claim 13, characterized in that: The side of the screening plate facing the first fixing fixture has a circuit structure; the central supporting structure includes an avoidance hole to avoid the circuit structure.

17. The fixing fixture according to claim 13, characterized in that: The second fixing fixture is a frame structure, which is arranged on the periphery of the first fixing fixture and is detachably connected to the outer frame structure of the first fixing fixture via a second cantilever.

18. The fixing fixture according to any one of claims 12 to 17, characterized in that: The cable fixing structure comprises an upwardly protruding flange, on which a groove or a through hole is arranged, and the groove or the through hole is used to fix the signal cable.

19. The fixing fixture according to claim 18, characterized in that: A flexible material is arranged in the groove or on the inner wall of the through hole to absorb stress.

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