CN115616376A

CN115616376A - Self-adjusting flying probe module for four-terminal test

Info

Publication number: CN115616376A
Application number: CN202211241856.9A
Authority: CN
Inventors: 麦伟东; 李金棠; 黄达许
Original assignee: Shenzhen Micronic Technology Co ltd
Current assignee: Shenzhen Micronic Technology Co ltd
Priority date: 2022-10-11
Filing date: 2022-10-11
Publication date: 2023-01-17

Abstract

The invention relates to the technical field of flying probe modules, in particular to a self-adjusting flying probe module for four-terminal testing, which is arranged on a flying probe machine and comprises: the two elastic knife rests are installed and connected with the flying needle machine through needle seats; the detection blade is arranged at one end of the tool rest and is used for testing four terminals of the PCB; the self-adjusting assembly is connected with the tool rest and arranged on the detection blade and used for adjusting the position of the tool nose of the detection blade. The flying probe module adopts an independent double-blade design to carry out four-line method test on the PCB, and the self-balancing component designed based on the balance lever principle automatically adjusts the tool tips of the double blades, so that the error of the tool tips is reduced, the double blades are subjected to insulation treatment, the short circuit phenomenon cannot occur, the detection process is stable and reliable, a circuit board cannot be damaged, and the detection precision is high.

Description

Self-adjusting flying probe module for four-terminal test

Technical Field

The invention relates to the technical field of flying probe modules, in particular to a self-adjusting flying probe module for four-terminal testing.

Background

The flying probe testing machine tests the PCB with high density, multiple layers, large wiring density and small measuring point distance through the flying probe module, and mainly tests the insulation and conduction values of the circuit board.

In the prior art, application numbers are disclosed: the invention of CN201420106716.5 is named as a flying probe testing machine and a flying probe testing shaft thereof, tests through the contact of a single testing probe and a PCB, has poor testing precision, and is not suitable for testing the PCB with high precision and large density produced at present.

In the prior art, a four-wire method is adopted to test the circuit board, so that the test accuracy is improved, but in the prior art, for example, the application number: the single detection probe in CN201420106716.5 is not suitable for high-precision detection, has large error, and is easy to prick a circuit board, resulting in the occurrence of adverse conditions such as copper attachment falling off, pin marks, scratches and the like after detection.

Disclosure of Invention

The invention aims to provide a self-adjusting flying probe module for four-terminal testing, which aims to solve the problems in the prior art.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides a four terminal test from adjusting flying probe module, the self-adjustment flying probe module sets up on flying probe machine, the self-adjustment flying probe module includes:

the two elastic knife rests are installed and connected with the flying needle machine through needle seats.

And the detection blade is arranged at one end of the cutter rest and is used for testing the four terminals of the PCB.

The self-adjusting assembly is connected with the tool rest and arranged on the detection blade and used for adjusting the position of the tool nose of the detection blade.

Furthermore, a mounting groove is formed in the needle base, a first threaded hole is formed in the mounting groove, a pre-pressing tensioning pin is mounted in the mounting groove and used for providing pre-pressing force for the tool rest, a connecting plate is mounted on the needle base, and an adjustable reflection-type photoelectric switch is mounted on the needle base and used for monitoring pressure value changes of the flying needle module in the testing process.

Furthermore, the tool rest comprises a connecting column, a first elastic frame and a second elastic frame, the first elastic frame is of a rectangular structure consisting of a fixed rod, a first connecting rod and two first rocking rods, and the two first rocking rods are connected and arranged between the fixed rod and the first connecting rod.

One end of the first elastic frame is provided with a mounting hole, one end of the second elastic frame is fixedly provided with a second connecting rod, and the second connecting rod is provided with an insertion hole.

Furthermore, the second elastic frame is of a rectangular structure consisting of a first connecting rod, a second connecting rod and two second rocking rods, the knife rest is made of PBT materials, the thicknesses of the two ends of the second connecting rod are thinner than the thicknesses of the rest positions to form elastic pieces, and a knife groove is formed in one side of the second connecting rod and used for installing and detecting blades.

Furthermore, the first elastic frame is provided with connecting holes distributed in an array mode, a connecting block is arranged in the first elastic frame, a bolt penetrates through a through hole in the connecting block to be connected with the first threaded hole, one side of each tool rest is provided with a polishing surface, and the polishing surfaces of the two tool rests are attached and connected.

And the two tool rests are fixedly connected through the matching of connecting columns and connecting holes.

Further, the detection blade comprises a first blade and a second blade, an insulating sheet is arranged between the first blade and the second blade, and the insulating sheet is fixedly connected with the jack through an insulating column, so that the insulating sheet is arranged between the first blade and the second blade.

Further, self-interacting subassembly sets up on second elasticity frame, and self-interacting subassembly includes tripod, rotatory leaf and rotary rod, and the one end of tripod is connected through two spliced poles and the mounting hole on two knife rests, and the fixed slot has been seted up to the other end, and the rotatory leaf rotates with the rotary rod through setting up the rotatory hole in its middle part and is connected, and the rotary rod passes rotatory hole and fixed slot fastening connection.

Furthermore, a fixing hole is formed in the second elastic frame, an adjusting rod is installed on the fixing hole, the upper end of the adjusting rod is attached to the two ends of the rotating blade, and the first blade and the second blade are adjusted through the balance lever principle.

The invention has the beneficial effects that:

1. the flying probe module adopts an independent double-blade design to carry out four-line method test on a PCB, and the self-balancing component designed based on the balance lever principle automatically adjusts the tool tips of the double blades, so that the error of the tool tips is reduced, the double blades are subjected to insulation treatment, the short circuit phenomenon cannot occur, the detection process is stable and reliable, a circuit board cannot be damaged, and the detection precision is high;

2. according to the flying needle module, the flying needle module can move in the X-axis direction, the Y-axis direction and the Z-axis direction to detect a PCB, the knife rest is made of PBT materials, the high-precision detection of the flying needle module is supported due to excellent performance and elasticity, the deformation of the knife rest is reliable, the detection result is accurate, and the blade is stably installed and fixed.

Drawings

The invention is further described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of the explosion structure of the flying probe module of the present invention

FIG. 2 is a schematic view of a part of the flying probe machine of the present invention;

FIG. 3 is an enlarged view of the structure of FIG. 2 at A according to the present invention;

FIG. 4 is a schematic view of a needle mount structure of the present invention;

FIG. 5 is a schematic structural view of a needle holder and a flying needle module of the present invention;

FIG. 6 is a schematic diagram of an exploded structure of the flying probe module of the present invention;

FIG. 7 is a schematic view of the tool holder configuration of the present invention;

FIG. 8 is a schematic view of the fly needle module adjustment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A self-adjusting flying probe module for four-terminal testing is disclosed, as shown in FIG. 2 and FIG. 3, the self-adjusting flying probe module is arranged on a probe base 2, a connecting plate 20 is installed on the probe base 2, the connecting plate 20 is connected and installed on a moving plate 5, 8 moving modules 6 are arranged on the flying probe machine, the moving modules 6 are installed on an electric sliding table on the flying probe machine and used for driving the moving modules 6 to move on an X axis and a Y axis, the moving modules 6 are also provided with electric sliding tables and used for driving the moving plate 5 to move on the moving modules 6 along the X axis direction, and a Z axis belt is also arranged on the moving plate 5 and used for driving the connecting plate 20 to reciprocate along the Z axis direction, so that four-line testing of a PCB is realized.

As shown in fig. 4, a mounting groove 24 is formed in the needle base 2, a cushion block 21 is fixedly arranged in the mounting groove 24, a first threaded hole 22 is formed in the cushion block 21, a pre-pressing tensioning pin 23 is arranged in the mounting groove 24, a groove 25 is formed in one side of the mounting groove 24, and a second threaded hole 26 is formed in the needle base 2.

As shown in fig. 5, the connecting plate 20 is mounted on the needle base 2 through a bolt, the bolt penetrates through the connecting plate 20 to be fixedly connected with the second threaded hole 26, the adjustable reflective photoelectric switch ITR8307 is mounted in the groove 25, when an object to be detected passes through the groove, the object reflects a signal emitted by the emitting end of the photoelectric switch to the receiving end, so that the photoelectric switch generates a switching action, and the pressure value change condition of the flying needle module in the testing process is mastered in real time, thereby realizing the high-speed precise testing of the flying needle testing machine.

As shown in fig. 1, 6 and 7, the self-adjusting fly needle module comprises two cutter holders, a first blade 3 and a second blade 4 are arranged at one end of each cutter holder, the first blade 3 and the second blade 4 are symmetrically arranged at one end of each cutter holder, a self-adjusting assembly is arranged on each cutter holder and used for adjusting the position of the tool nose of the first blade 3 and the position of the tool nose of the second blade 4, and an insulating sheet 19 is arranged between the first blade 3 and the second blade 4 and used for blocking the first blade 3 and the second blade 4.

The tool rest comprises a first elastic frame 12 and a second elastic frame 18, the first elastic frame 12 and the second elastic frame 18 are both rectangular structures, one end of the first elastic frame 12 is connected with the second elastic frame 18, the first elastic frame 12 is provided with connecting holes 11 distributed in an array mode, a connecting block 10 is arranged in the first elastic frame 12, the connecting block 10 is provided with a through hole 101 and the connecting holes 11, and a bolt penetrates through the through hole 101 to be matched with a first threaded hole 22.

The knife rest is made of PBT material, and has high strength, fatigue resistance, stable size and small creep deformation; the heat aging resistance is good; solvent resistance; stability to water; the insulating property is excellent; the dielectric coefficient is 3.0-3.2; arc resistance; the processing and forming are fast through injection molding or extrusion molding of common equipment; the tool rest with the two-stage square elastic frame structure is adopted, so that the flying probe module has a more sensitive test effect.

One side of knife rest is equipped with sanding face 121, and sanding face 121 is polished the back through the whetstone, eliminates the burr that injection molding support forming process formed and drapes over one's shoulders the cutting edge of a knife or a sword, and the sanding face 121 laminating cooperation of two knife rests is connected fixedly through spliced pole 14 and connecting hole 11 for two knife rests of firm connection.

One end of the first elastic frame 12 is provided with a mounting hole 122, the second elastic frame 18 is provided with a fixing hole 17, the fixing hole 17 is provided with an adjusting rod 15, one end of the second elastic frame 18 is fixedly provided with a second connecting rod 184, the second connecting rod 184 is provided with a jack 181, the jack 181 is internally fixedly provided with an insulating column 191, and the insulating sheet 19 is arranged between the two knife rests through the two insulating columns 119.

The first elastic frame 12 comprises a fixing rod 126, a first connecting rod 125 and two first rocking bars 124, wherein the two first rocking bars 124 are arranged between the fixing rod 126 and the first connecting rod 125 to form the first elastic frame 12 similar to a double-rocking-bar mechanism, the first rocking bars 124 can swing on the fixing rod 126, the second connecting rod 184 is arranged at one end of the second elastic frame 18 far away from the first elastic frame 12, and a knife slot 16 is arranged at one side of the second connecting rod 184 for fixedly mounting the first blade 3 or the second blade 4.

The second elastic frame 18 includes a first connecting rod 125, a second connecting rod 184 and two second rocking bars 182, two ends of the second connecting rod 184 are thinned, and elastic sheets are formed by utilizing the high toughness of the PBT material, so that the second rocking bars 182 can swing around the joints of the first connecting rod 125 and the second rocking bars 182, and the first rocking bars 124 and the second rocking bars 182 have the same structure.

In the actual test process, the second elastic frame 18 firstly undergoes the first-stage deformation, then the first elastic frame 12 starts the second-stage elastic deformation, and finally the second-stage deformation is captured by the photoelectric sensor and is used as the feeding amount of the flying probe tester in the Z-axis direction hitting on the PCB.

The mounting position of the insulating column 191 not only realizes the positioning and mounting of the insulating sheet 19, but also limits the movement range of the second elastic frame 18, thereby realizing the mutual adjustment of the needle point positions by utilizing a balance lever mechanism.

The pre-pressing tensioning pin 23 is arranged to realize that the flying probe module can obtain pre-pressing force once being assembled, so that the first rocker 124 in the tool rest is tightly attached to the cylindrical surface of the pre-pressing tensioning pin 23, and the flying probe module can be ensured to have enough rigidity and stability in the high-speed running process of the flying probe testing machine.

The self-adjusting component is arranged on the second elastic frame 18, and the position of the knife point of the first blade 3 or the second blade 4 is adjusted by using a balance lever principle.

Self-regulating assembly includes tripod 7, swivel leaf 72 and rotary rod 74, the one end of tripod 7 is connected with spliced pole 14, fixed slot 71 has been seted up to the other end, tripod 7 passes through spliced pole 14 and is connected with mounting hole 122, swivel hole 73 has been seted up at the middle part of swivel leaf 72, swivel leaf 72 rotates with rotary rod 74 through swivel hole 73 and is connected, rotary rod 74 passes swivel hole 73 and fixed slot 71 fastening connection, the both ends of swivel leaf 72 and the laminating of adjusting pole 15 upper end.

As shown in fig. 8, the height of the point of the second blade 4 is higher than that of the first blade 3, the self-adjusting assembly utilizes the principle of balanced lever, the flying probe module is driven by the Z-axis motor to feed forward, the point of the first blade 3 strikes on the PCB, as the feed amount increases, the adjusting rod 15 on the tool holder on which the first blade 3 is mounted is pushed up under the reaction force of the PCB, the tool holder swings around the left position of the first connecting rod 125, so that one end of the rotating blade 72 on the first blade 3 swings upward around the rotating rod 74, and the rotating blade 72 rotates counterclockwise, the other side of the rotating blade 72 presses down the other adjusting rod 15, so that the second blade 4 obtains a new power source in addition to the driving force of the Z-axis motor, and finally the point of the first blade 3 and the second blade 4 meets and strikes on the surface of the PCB in a very short time.

The balance lever mechanism not only makes up the injection molding error generated in the injection molding process of the tool rest, but also reduces the technical requirement of the assembling process, and improves the manufacturing efficiency of the flying-probe module.

In this embodiment, the working principle of the self-adjusting flying probe module for four-terminal testing is as follows:

firstly, the tool rest is installed, and the method comprises the following steps:

1. grinding the matching surfaces of the two tool rests by using a knife stone to eliminate burr burrs formed in the process of manufacturing and molding the injection molding piece;

2. adhering the insulating column 191 on the left tool rest by glue, and attaching the insulating sheet 19;

3. splicing and combining two tool rests into a whole by utilizing five connecting columns 14, and assembling an adjusting rod 15 at the same time, so that the distance between the upper end surface of the adjusting rod 15 and the bottom surface of the tool rest is 7.2-7.3mm;

4. assembling a tripod 7, a rotating blade 72, a rotating rod 74 and two connecting columns 14 for mounting the tripod 7, so that the rotating blade 72 can flexibly and freely rotate around the central line of the rotating rod 74 to form a balance lever mechanism, and meanwhile, the distance between the rotating blade 72 and the bottom surface of a tool rest is 8-8.15mm;

5. and assembling the blade, and testing the PCB by a four-wire method.

Due to manufacturing errors of the die forming parts, size errors of the plastic parts caused by plastic shrinkage rate fluctuation, errors caused by inaccurate shrinkage rate selection in die designing, surface abrasion of the die forming parts, and size change values caused by fit clearance or installation errors of the die movable or fixed forming parts, the size precision of the plastic parts is influenced, so that the conditions that notches of blade installation positions of two tool rests are in tandem after being assembled, the heights are inconsistent and the like are caused, and the assembly and the use of a flying probe module are influenced. Thanks to the high toughness of PBT, the balancing lever mechanism is formed by combining the triangular frame, the rotating rod and the rotating blade by depending on two small columns, and the problem of inconsistent notches caused by the dimensional deviation of plastic parts is solved ingeniously.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.

Claims

1. The utility model provides a four terminal test from adjusting flying probe module, the self-adjustment flying probe module sets up on flying probe machine, its characterized in that, the self-adjustment flying probe module includes:

the two elastic tool rests are connected with the flying needle machine through a needle seat (2);

the detection blade is arranged at one end of the tool rest and is used for testing four terminals of the PCB;

2. The self-adjusting flying probe module for the four-terminal test according to claim 1, wherein the needle base (2) is provided with a mounting groove (24), a first threaded hole (22) is formed in the mounting groove (24), a pre-pressing tensioning pin (23) is installed in the mounting groove (24) and used for providing pre-pressing force for the tool rest, a connecting plate (20) is installed on the needle base (2), and an adjustable reflective photoelectric switch is installed on the needle base (2) and used for monitoring the pressure value change of the flying probe module in the test process.

3. The self-adjusting flying probe module for four-terminal testing as claimed in claim 2, wherein the tool holder comprises a connection column (14), a first elastic frame (12) and a second elastic frame (18), the first elastic frame (12) is a rectangular structure composed of a fixed rod (126), a first connecting rod (125) and two first rocking bars (124), and the two first rocking bars (124) are connected and arranged between the fixed rod (126) and the first connecting rod (125);

one end of the first elastic frame (12) is provided with a mounting hole (122), one end of the second elastic frame (18) is fixedly provided with a second connecting rod (184), and the second connecting rod (184) is provided with an insertion hole (181).

4. The self-adjusting flying probe module for four-terminal testing according to claim 3, wherein the second elastic frame (18) is a rectangular structure composed of a first connecting rod (125), a second connecting rod (184) and two second rocking rods (182), the knife rest is made of PBT (polybutylene terephthalate), the thickness of the two ends of the second connecting rod (184) is thinner than the rest positions to form elastic sheets, and a knife slot (16) is arranged on one side of the second connecting rod (184) and used for installing a detection blade.

5. The self-adjusting flying probe module for four-terminal testing according to claim 3, wherein the first elastic frame (12) is provided with connecting holes (11) distributed in an array, the first elastic frame (12) is provided with a connecting block (10), a bolt passes through a through hole (101) on the connecting block (10) to be connected with the first threaded hole (22), one side of each tool holder is provided with a grinding surface (121), and the grinding surfaces (121) of the two tool holders are jointed;

the two tool rests are connected and fixed through the matching of a connecting column (14) and a connecting hole (11).

6. The self-adjusting flying probe module for four-terminal testing according to claim 3, wherein the detecting blade comprises a first blade (3) and a second blade (4), an insulating sheet (19) is arranged between the first blade (3) and the second blade (4), and the insulating sheet (19) is fixedly connected with the jack (181) through an insulating column (191), so that the insulating sheet (19) is installed between the first blade (3) and the second blade (4).

7. The self-adjusting flying probe module for four-terminal test according to claim 4, wherein the self-adjusting assembly is arranged on the second elastic frame (18), the self-adjusting assembly comprises a tripod (7), a rotating blade (72) and a rotating rod (74), one end of the tripod (7) is connected with the mounting holes (122) on the two tool holders through the two connecting columns (14), the other end is provided with a fixing groove (71), the rotating blade (72) is rotatably connected with the rotating rod (74) through a rotating hole (73) arranged in the middle of the rotating blade, and the rotating rod (74) passes through the rotating hole (73) and is fixedly connected with the fixing groove (71).

8. The self-adjusting flying probe module for four-terminal testing according to claim 7, wherein the second elastic frame (18) is provided with a fixing hole (17), the fixing hole (17) is provided with an adjusting rod (15), the upper end of the adjusting rod (15) is attached to two ends of the rotating blade (72), and the first blade (3) and the second blade (4) are adjusted by a balance lever principle.