CN211457884U - Self-aligning and positioning device for printed circuit board - Google Patents
Self-aligning and positioning device for printed circuit board Download PDFInfo
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- CN211457884U CN211457884U CN202020487830.2U CN202020487830U CN211457884U CN 211457884 U CN211457884 U CN 211457884U CN 202020487830 U CN202020487830 U CN 202020487830U CN 211457884 U CN211457884 U CN 211457884U
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- circuit board
- printed circuit
- positioning
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Abstract
The utility model provides a self-aligning and positioning device of a printed circuit board, which comprises a tool body and a positioning and clamping unit; the positioning and clamping unit comprises a printed circuit board mounting station arranged on the upper surface of the tool body, a circuit board positioning pin and a stop pin which are fixed on the periphery of the printed circuit board mounting station, and automatic upper buckles which are oppositely arranged on two sides of the printed circuit board mounting station; the circuit board positioning pin is used for matching and positioning with a pin hole on the printed circuit board, and the stop pin is used for contacting and positioning with the side surface of the printed circuit board; and the automatic upper buckle is used for pressing the positioned printed circuit board on a printed circuit board mounting station. The utility model discloses can, when fixed, do not have the harm to printed circuit board, positioning accuracy is high, and it is convenient to use, has improved production efficiency.
Description
Technical Field
The utility model relates to an automatic change location clamping device for production line specifically is a printed circuit board self-aligning positioner.
Background
With the progress of science and technology, the demand of the manufacturing industry for automatic assembly and automatic detection on a production line is increasingly urgent. The production mode of various products and small batch is the development trend of the production line at the present stage so as to improve the flexibility and adaptability of the whole production line.
On many electronic product automated assembly detection lines, it is required to reduce the number of assembled or detected workpiece processes as much as possible, or to increase the circulation speed on the stations, thereby improving the working efficiency. At present, in the production process of a circuit board card, a part to be assembled or detected needs to be manually placed in an operation area, the part is manually transported to the next process after the completion, most of the parts are manually operated, an operator manually installs materials in a tool clamp, the positioning needs to be carefully carried out during the installation, each step needs to be manually clamped, whether the installation is in place or not is checked after the installation is finished, then corresponding actions are finished, and a workpiece is manually released after the completion, the traditional manual operation tool cannot meet the requirement of automatic assembly and detection on the positioning precision of the tool, the positioning precision and consistency of each installation cannot be ensured, the manual assembly, disassembly and inspection and positioning waste mass production time, the production efficiency is greatly reduced, the clamping state of the workpiece needs to be adjusted after each clamping, so that the clamping state meets the requirements of assembly and testing, and the process consumes long time, slowing down the whole production efficiency.
Along with the improvement of degree of automation, the transfer that the product was accomplished to the transfer line body, robot was added to the automation line trade is more and more popular, in order to satisfy the operation that the robot does not stop, promotes operation quality and transportation efficiency, reduces robot latency, reduces people's walking moving time, reduces intensity of labour. Research on tooling fixtures applicable to robot operation in the electronic assembly industry has become an effort for those skilled in the art.
In the prior art, the positioning and clamping of a Printed Circuit Board (PCB) are all achieved by means of elbow clamps. The lateral clamping force of the elbow clamp is quite large, the printed circuit board can deform due to the clamping force of the elbow clamp, the positioning precision is poor, and damage can be caused to the printed circuit board. And the elbow presss from both sides the too big space that occupies, can influence the operation of automatic test on the production line and assembly, and its manual work's intensity of labour is big, and the simple operation nature is poor, leads to production efficiency low.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a printed circuit board is from aligning positioner can not have the damage to printed circuit board when fixed, and positioning accuracy is high, and it is convenient to use, has improved production efficiency.
The utility model discloses a realize through following technical scheme:
a self-aligning positioning device for a printed circuit board comprises a tool body and a positioning and clamping unit;
the positioning and clamping unit comprises a printed circuit board mounting station arranged on the upper surface of the tool body, a circuit board positioning pin and a stop pin which are fixed on the periphery of the printed circuit board mounting station, and automatic upper buckles which are oppositely arranged on two sides of the printed circuit board mounting station;
the circuit board positioning pin is used for matching and positioning with a pin hole on the printed circuit board, and the stop pin is used for contacting and positioning with the side surface of the printed circuit board; and the automatic upper buckle is used for pressing the positioned printed circuit board on a printed circuit board mounting station.
Preferably, the automatic upper buckle comprises a base, and the base is installed on the tool body; a guide shaft penetrates through the base along the horizontal direction, and a clamping jaw is mounted on the guide shaft and can rotate around the axis of the guide shaft; a spring is arranged between the clamping jaw and the base along the horizontal direction, the spring is positioned above the guide shaft, and the spring and the guide shaft are vertically arranged.
Furthermore, a stop screw is also arranged on the base; the stop screw and the spring are arranged on the same side of the clamping jaw in parallel, and the stop screw is positioned below the guide shaft; one end of the stop screw is tightly propped against the free end of the clamping jaw, and the other end of the stop screw penetrates through the base and is screwed up through the nut.
Preferably, the two automatic upper buckles are arranged on the tool body in a staggered mode and are oppositely arranged.
Preferably, a groove is formed in the printed circuit board mounting station, the circuit board positioning pin and the stop pin are arranged on the upper surface of the edge of the groove, and when the printed circuit board is arranged on the printed circuit board mounting station in a front side or a back side, the lower surface of the printed circuit board can be in contact with the upper surface of the edge of the groove.
Preferably, two positioning and clamping units are arranged on the upper surface of the tool body.
Preferably, the tool body is further provided with an adjusting pin hole and at least two guide holes; the adjusting pin hole is used for fixing the relative position of the tool body and the testing needle bed; during testing, the guide posts on the testing needle bed extend into the guide holes to be matched and positioned.
Furthermore, an adjusting steel sleeve is coaxially arranged in the adjusting pin hole, and a guiding steel sleeve is coaxially arranged in the guiding hole.
Preferably, the device further comprises a tool connecting plate; the upper surface of the tool connecting plate is provided with a tool positioning pin; the tool body is provided with a pin bush, the pin bush is sleeved on the tool positioning pin, and the tool connecting plate is fixedly connected with the tool body through a screw.
Further, a taper positioning pin sleeve is arranged on the lower surface of the tooling connecting plate and is matched with the taper positioning pin sleeve on the tray for conveying the printed circuit board.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses the device sets up circuit board locating pin and backing pin at printed circuit board installation station periphery, when placing printed circuit board on printed circuit board installation station, makes the circuit board locating pin insert in the pinhole of printed circuit board, simultaneously, the side contact of backing pin and printed circuit board to restricted the removal of printed circuit board in the horizontal direction through circuit board locating pin and backing pin; and then the printed circuit board is pressed tightly through automatic upper buckles, so that the movement of the printed circuit board in the vertical direction is limited, and the positioning and clamping of the printed circuit board are realized. The utility model adopts the positioning pin and the stop pin for positioning, and has no lateral clamping force to the printed circuit board; the automatic buckling generates a force from top to bottom, not a lateral force, and the force is very small, so that the printed circuit board cannot be damaged through verification; therefore, the utility model can not lead the printed circuit board to deform because of the lateral clamping force like an elbow clamp, and improves the positioning precision; just the utility model discloses application method is convenient, has reduced manual work intensity, has improved production efficiency, has satisfied the demand of printed circuit board automatic assembly and test.
Further, the utility model discloses buckle on automatic, can be convenient through the set screw to the position of compressing tightly of jack catch adjust to the adjustment is to printed circuit board's packing force, and conveniently takes out the impression system circuit board.
Furthermore, when the printed circuit board is arranged on the printed circuit board mounting station with the front side or the back side, the lower surface of the printed circuit board can be in contact with the upper surface of the edge of the groove, so that the printed circuit board can be positioned and clamped on the front side and the back side on the printed circuit board mounting station, a tool arranged on the back side of the printed circuit board is omitted, the utilization rate of the positioning device is improved, and the cost is saved from the aspects of space and structure.
Furthermore, the two positioning and clamping units are arranged, so that two printed circuit boards can be clamped simultaneously, the utilization rate of the positioning device is improved, and the production efficiency is improved.
Furthermore, the automatic test adopts a needle bed test scheme, and the test, programming and power supply points on the printed circuit board are led out as test points on one side of the printed circuit board, so that the efficiency of the test and programming procedures can be greatly improved, however, higher requirements are put on the positioning precision of the positioning device and the precision of the testing needle bed, and in order to ensure the smooth proceeding of the test, the tool body is provided with an adjusting pin hole and a guide hole, the adjusting pin hole is used for adjusting the relative position relation between the test needle bed and the tool body, the guide hole is used for ensuring that the test needle bed is in the descending process, each test point on the printed circuit board can be accurately aligned, the guide hole has a precision relation with the adjusting pin hole on the tool body, the accurate contact position of the test needle bed and the test point of the printed circuit board can be ensured only by aligning the upper guide hole with the guide post in the test needle bed. Therefore, the utility model discloses a location and direction of printed circuit board's test needle bed on the electronic product production line.
Further, the utility model discloses with the separation of frock connecting plate and frock body, use the locating pin location to couple together the two through the screw, when changing the frock body of other PCB integrated circuit boards, only need change the frock body on the frock connecting plate can, the connection interface frock locating pin of frock connecting plate is general interface, and the connection interface pin bush size of all frock bodies is all the same, just so makes things convenient for the change of frock body, has improved the availability factor, reduces manual work intensity.
Drawings
FIG. 1 is a schematic diagram of an overall structure of the printed circuit board for front clamping of the printed circuit board according to the embodiment of the present invention;
FIG. 2 is an overall structure diagram of the reverse side clamping printed circuit board according to the embodiment of the present invention;
fig. 3 is a schematic structural view of the tool body according to the embodiment of the present invention;
fig. 4 is a schematic view of the automatic fastening structure according to the embodiment of the present invention;
fig. 5 is a schematic view of a positional relationship between the tool body and the testing needle bed according to the embodiment of the present invention;
FIG. 6 is a schematic diagram of a connection plate of the tooling in the example.
In the figure: 1. the device comprises a printed circuit board, 2, a circuit board positioning pin, 3, a stop pin, 4, a tool body, 5, a guide hole, 6, a tool connecting plate, 7, a pin sleeve, 8, an automatic upper buckle, 9, an adjusting pin hole, 10, a screw, 11, a spring, 12, a guide shaft, 13, a clamping jaw, 14, a base, 15, a stop screw, 16, a nut, 17, a test needle bed, 18, a test needle bed frame, 19, a taper positioning pin sleeve, 20 and a tool positioning pin.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings, which are provided for purposes of illustration and not limitation.
As shown in FIG. 1 and FIG. 2, the self-aligning positioning device for printed circuit board comprises a tool connecting plate 6 and a tool body 4 installed on the tool connecting plate 6.
As shown in fig. 3, the tool body 4 is provided with a positioning and clamping unit. The positioning and clamping unit comprises a printed circuit board mounting station arranged on the upper surface of the tool body 4, a circuit board positioning pin 2 and a stop pin 3 fixed on the periphery of the printed circuit board mounting station, and automatic upper buckles 8 oppositely arranged on two sides of the printed circuit board mounting station.
The circuit board positioning pin 2 is used for matching and positioning with a pin hole on the printed circuit board 1, and the stop pin 3 is used for contacting and positioning with the side surface of the printed circuit board 1 so as to limit the movement and rotation of the printed circuit board 1 in the horizontal direction. In one embodiment, two circuit board alignment pins 2 are provided.
The automatic upper buckle 8 is used for pressing the positioned printed circuit board 1 on a printed circuit board mounting station so as to limit the movement of the printed circuit board 1 in the longitudinal direction. During testing, the printed circuit board 1 can be vertically pulled out due to the influence of the plugging force of the testing needle bed, so that the up-and-down movement of the printed circuit board needs to be limited to ensure the smooth operation of plugging; the automatic upper buckle 8 has the function of limiting the movement of the printed circuit board 1 in the up-down direction by clamping the printed circuit board 1 in the process of testing the printed circuit board 1, so as to ensure the smooth plugging of the testing needle bed.
As shown in fig. 4, the automatic fastening 8 includes a base 14, and the automatic fastening 8 is mounted on the tool body 4 through the base 14. A guide shaft 12 penetrates through the base 14 along the horizontal direction, a clamping jaw 13 is installed on the guide shaft 12, and the clamping jaw 13 can rotate around the axis of the guide shaft 12. A spring 11 is arranged between the claw 13 and the base 14 along the horizontal direction, the spring 11 is positioned above the guide shaft 12, and the spring 11 and the guide shaft 12 are arranged vertically.
In a specific embodiment, two automatic buttons 8 oppositely arranged on the tool body 4 are arranged in a staggered manner.
As shown in fig. 4, a stop screw 15 and a nut 16 may also be disposed on the base 14, the stop screw 15 is disposed on the same side of the jaw 13 in parallel with the spring 11, and the stop screw 15 is located below the guide shaft 12; the stop screw 15 is fastened at one end to the free end of the jaw 13 and at the other end through the base 14 and tightened by a nut 16. When the clamping device is used, the position of the abutting end of the stop screw 15, namely the position of the abutting end of the stop screw 15 and the free end of the clamping jaw 13 can be adjusted according to requirements, so that the reset position of the spring 11, namely the pressing position of the clamping jaw 13 can be adjusted, and the purpose of adjusting the pressing force of the clamping jaw 13 on the printed circuit board 1 can be achieved through the stop screw 15.
In one embodiment, a groove is formed in the printed circuit board mounting station, the circuit board positioning pin 2 and the stop pin 3 are both disposed on the upper surface of the edge of the groove, the electronic components on the front and back surfaces of the printed circuit board 1 can be accommodated in the groove, and the lower surface of the printed circuit board 1 can be in contact with the upper surface of the edge of the groove when the printed circuit board 1 is placed on the printed circuit board mounting station with the front or back surface. Therefore, the printed circuit board 1 can be positioned and clamped on the front side and the back side of the printed circuit board mounting station, a clamping tool for placing the back side of the printed circuit board 1 is omitted, the utilization rate of the positioning device is improved, and the cost is saved in space and structure.
In a specific embodiment, two positioning and clamping units are arranged on the upper surface of the tool body 4, so that two printed circuit boards 1 can be clamped simultaneously, the utilization rate of the printed circuit boards is improved, and the production efficiency is improved.
The traditional printed circuit board detection and programming program is manual operation, the printed circuit board is detected by using a universal meter to detect voltage and resistance values on the printed circuit board, test points and distribution points are arranged on the front surface and the back surface of the printed circuit board, the programming program of the printed circuit board supplies power to the printed circuit board, the programming device is used for programming the program into DSP and FPGA chips, the manual operation is complex in process, the manual operation is prone to causing problems, and the test result is not convenient to record. The needle bed testing scheme adopted by the automatic test leads out the testing, programming and power supplying points on the printed circuit board on one side of the printed circuit board as testing points, so that the efficiency of the testing and programming procedures can be greatly improved, but higher requirements are provided for the positioning precision of the positioning device and the precision of the testing needle bed.
In order to ensure the smooth test, the tool body 4 is also provided with an adjusting pin hole 9 and two guide holes 5; the adjusting pin holes 9 are used for adjusting the relative position of the fixed tool body 4 and the testing needle bed 17. The guide holes 5 and the adjusting pin holes 9 on the tool body 4 have a precision relation, when in test, two guide posts in the test needle bed 17 are respectively opposite to the two guide holes 5, so that the contact position between a test needle of the test needle bed 17 and a test point of the printed circuit board 1 can be ensured to be accurate, the guide holes 5 play a role in guiding the test needle bed 17, the position between a probe of the test needle bed 17 and the test point of the printed circuit board 1 is ensured to be accurate in the downward process of the test needle bed 17, the position relation between the test needle bed 17 and the tool body 4 is shown in a figure 5, the test needle bed 17 is installed on a test needle bed frame 18, the tool body 4 is placed on a tray through a tool connecting plate 6, and a conveyor line body is positioned among stations along with the tray.
In one embodiment, an adjustment steel sleeve is coaxially disposed in the adjustment pin hole 9, and a guide steel sleeve is coaxially disposed in the guide hole 5.
As shown in fig. 3, the tool body 4 is provided with a pin bush 7 and a threaded hole. As shown in fig. 6, the tool connection plate 6 is provided with a tool positioning pin 20 and a threaded hole corresponding to the threaded hole of the tool body 4 on the upper surface. The pin bush 7 on the frock body 4 is nested on the frock locating pin 20, and frock connecting plate 6 passes through screw 10 fixed connection with frock body 4. The tool connecting plate 6 is provided with the threaded holes and the tool positioning pins 20 so as to be connected with the tool body 4, and the tool bodies 4 of different models can be replaced conveniently. The tool connecting plate 6 and the tool body 4 are designed to be detachable, the tool connecting plate and the tool body 4 are positioned by the tool positioning pin 20 and connected through the screw 10, when the tool body 4 of other PCB boards is replaced, only the tool body 4 on the tool connecting plate 6 needs to be replaced, the tool positioning pin 20 of the tool connecting plate 6 is a universal connecting interface, the sizes of the pin sleeves 7 of all the tool bodies 4 are the same, the tool body 4 is convenient to replace, the use efficiency is improved, and the manual work operation intensity is reduced.
The effect of pin bush 7 is because the material of frock body 4 is the phenol-formaldehyde paper laminate, and frock locating pin 20 in the frock connecting plate 6 is 4Cr13 material, in order to ensure the permanent accurate positioning of frock body 4 and frock connecting plate 6, uses pin bush 7 and frock body 4 interference to be connected, and pin bush 7 cooperates with frock locating pin 20.
The lower surface of the tooling connecting plate 6 is provided with a taper positioning pin sleeve 19, and the taper positioning pin sleeve 19 is assembled with the taper positioning pin sleeve of the tray for conveying the printed circuit board 1. When the clamping device is used, the taper positioning pin sleeve 19 is sleeved on the taper positioning pin of the tray, so that reliable clamping and positioning of the tool connecting plate 6 on the tray are realized.
The principle of the utility model is that: when the printed circuit board 1 is placed on a printed circuit board mounting station of the tool body 4, the circuit board positioning pin 2 on the tool body 4 is inserted into a pin hole of the printed circuit board 1, and meanwhile, the stop pin 3 is contacted with the side surface of the printed circuit board 1, so that the movement of the printed circuit board 1 in four degrees of freedom in the horizontal direction is limited by the circuit board positioning pin 2 and the stop pin 3; and then the printed circuit board 1 is pressed tightly through the automatic upper buckle 8, and the movement of the printed circuit board 1 in the up-down direction with two degrees of freedom is limited, so that the positioning and clamping of the printed circuit board 1 are completed. During testing, the relative position of the fixed tool body 4 and the testing needle bed 17 is adjusted through the adjusting pin hole 9, and the position between a probe on the testing needle bed 17 and a measuring point on the printed circuit board 1 is ensured to be accurate through the guiding effect of the guide hole 5 in the descending process of the testing needle bed 17.
The utility model discloses a use method does: install frock connecting plate 6 on the tray through tapering locating pin cover 19, pass through screw 10 with frock body 4, frock locating pin 20 location is installed on frock connecting plate 6, place printed circuit board 1 on the printed circuit board installation station of frock body 4, make circuit board locating pin 2 on the frock body 4 insert in the pinhole of printed circuit board 1, use circuit board locating pin 2 and backing pin 3 to fix a position printed circuit board 1, after the location is accomplished, use automatic 8 of going up to press from both sides printed circuit board 1 and press from both sides tightly, in order to guarantee the positioning accuracy of printed circuit board 1 test and subassembly test, printed circuit board 1 can all be placed to the left and right sides on frock body 4, and printed circuit board 1 openly or reverse side place all can. And then, placing the tray on an automatic production line, and after the tray moves to the position below the test needle bed 17 and stops moving, in the installation and adjustment stage of the test needle bed, ensuring the position precision between the test needle bed and the tool body 4 through the auxiliary tool positioning shaft and the adjusting pin hole 9 on the tool body 4, thereby ensuring that the guide columns on the test needle bed and the guide holes 5 on the tool body 4 can be mutually matched to ensure the test precision of the printed circuit board.
Claims (10)
1. The self-aligning positioning device for the printed circuit board is characterized by comprising a tool body (4) and a positioning and clamping unit;
the positioning and clamping unit comprises a printed circuit board mounting station arranged on the upper surface of the tool body (4), a circuit board positioning pin (2) and a stop pin (3) fixed on the periphery of the printed circuit board mounting station, and automatic upper buckles (8) oppositely arranged on two sides of the printed circuit board mounting station;
the circuit board positioning pin (2) is used for being matched and positioned with a pin hole on the printed circuit board (1), and the stop pin (3) is used for being in contact positioning with the side face of the printed circuit board (1); the automatic upper buckle (8) is used for pressing the positioned printed circuit board (1) on a printed circuit board mounting station.
2. The printed circuit board self-aligning positioning device according to claim 1, characterized in that the automatic fastening (8) comprises a base (14), the base (14) is mounted on the tool body (4); a guide shaft (12) penetrates through the base (14) along the horizontal direction, a clamping jaw (13) is installed on the guide shaft (12), and the clamping jaw (13) can rotate around the axis of the guide shaft (12); a spring (11) is arranged between the clamping jaw (13) and the base (14) along the horizontal direction, the spring (11) is positioned above the guide shaft (12), and the spring (11) and the guide shaft (12) are vertically arranged.
3. The self-aligning positioning device of the printed circuit board according to claim 2, characterized in that a stop screw (15) is further provided on the base (14); the stop screw (15) and the spring (11) are arranged on the same side of the clamping jaw (13) in parallel, and the stop screw (15) is positioned below the guide shaft (12); one end of a stop screw (15) is tightly propped against the free end of the clamping jaw (13), and the other end of the stop screw passes through the base (14) and then is screwed up through a nut (16).
4. The self-aligning positioning device of the printed circuit board according to claim 1, characterized in that two automatic buttons (8) oppositely arranged on the tool body (4) are arranged in a staggered manner.
5. The self-aligning positioning device of the printed circuit board according to claim 1, wherein a groove is formed in the printed circuit board mounting station, the circuit board positioning pin (2) and the stopper pin (3) are formed on the upper surface of the edge of the groove, and the lower surface of the printed circuit board (1) is in contact with the upper surface of the edge of the groove when the printed circuit board (1) is placed on the printed circuit board mounting station with the front or the back surface.
6. The printed circuit board self-aligning positioning device according to claim 1, characterized in that two positioning and clamping units are arranged on the upper surface of the tool body (4).
7. The printed circuit board self-aligning positioning device according to claim 1, wherein the tool body (4) is further provided with an adjusting pin hole (9) and at least two guide holes (5); the adjusting pin hole (9) is used for fixing the relative position of the tool body (4) and the testing needle bed (17); during testing, the guide posts on the testing needle bed (17) extend into the guide holes (5) for matching and positioning.
8. The self-aligning positioning device of the printed circuit board according to claim 7, characterized in that an adjusting steel sleeve is coaxially arranged in the adjusting pin hole (9), and a guiding steel sleeve is coaxially arranged in the guiding hole (5).
9. The printed circuit board self-aligning positioning device of claim 1, further comprising a tooling connection plate (6); a tooling positioning pin (20) is arranged on the upper surface of the tooling connecting plate (6); the tool body (4) is provided with a pin bush (7), the pin bush (7) is sleeved on a tool positioning pin (20), and the tool connecting plate (6) is fixedly connected with the tool body (4) through a screw (10).
10. The printed circuit board self-aligning positioning device according to claim 9, characterized in that a tapered positioning pin bushing (19) is provided on the lower surface of the tooling connection plate (6), and the tapered positioning pin bushing (19) is fitted with a tapered positioning pin bushing on a tray for transporting the printed circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020487830.2U CN211457884U (en) | 2020-04-03 | 2020-04-03 | Self-aligning and positioning device for printed circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020487830.2U CN211457884U (en) | 2020-04-03 | 2020-04-03 | Self-aligning and positioning device for printed circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211457884U true CN211457884U (en) | 2020-09-08 |
Family
ID=72297024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020487830.2U Active CN211457884U (en) | 2020-04-03 | 2020-04-03 | Self-aligning and positioning device for printed circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211457884U (en) |
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2020
- 2020-04-03 CN CN202020487830.2U patent/CN211457884U/en active Active
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