CN114428207B - Printed circuit board testing equipment - Google Patents
Printed circuit board testing equipment Download PDFInfo
- Publication number
- CN114428207B CN114428207B CN202210353994.XA CN202210353994A CN114428207B CN 114428207 B CN114428207 B CN 114428207B CN 202210353994 A CN202210353994 A CN 202210353994A CN 114428207 B CN114428207 B CN 114428207B
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- circuit board
- printed circuit
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- movable block
- block
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- 238000012360 testing method Methods 0.000 title claims abstract description 44
- 239000013013 elastic material Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 description 11
- 238000005259 measurement Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000523 sample Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012956 testing procedure Methods 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/2806—Apparatus therefor, e.g. test stations, drivers, analysers, conveyors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/2806—Apparatus therefor, e.g. test stations, drivers, analysers, conveyors
- G01R31/2808—Holding, conveying or contacting devices, e.g. test adapters, edge connectors, extender boards
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Tests Of Electronic Circuits (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a printed circuit board testing device, which comprises a placing device, wherein the placing device comprises a first placing plate, a first shell, a mounting rod, a clamping plate, a connecting pipe, a sliding rod, a second placing plate and an adjusting knob, and can fix a printed circuit board; the measuring device comprises a mounting seat, a motor, a mounting block, a first sliding block, a first air cylinder, a second sliding block, a second air cylinder, a second shell, a contact rod, a first spring, a third shell, a display module and a measuring module, can measure each wiring point on the printed circuit board, and can display the wiring points through the display module to achieve the purpose of testing the printed circuit board; the lifting device comprises a second spring, a tray, a first movable block, a first supporting wheel, a second movable block and a second supporting wheel, and the lifting range of the lifting device is changed through airflow, so that the lifting device is suitable for printed circuit boards of different sizes.
Description
Technical Field
The invention relates to the field of printed circuit production, in particular to printed circuit board testing equipment.
Background
In the production and manufacturing process of the printed circuit board, the electrical connection condition of the etching circuit on the circuit board needs to be checked, so as to prevent the occurrence of the conditions such as open circuit, the traditional method is to use a measuring device, the measurement is carried out between each wiring point through probes, but the wiring points are numerous, so a downward pressing type test bench is generally used, a plurality of probes are arranged above the test bench, the multi-line measurement can be carried out simultaneously, but the probe structure of the traditional test bench is positioned above the circuit board, certain difficulty is caused in taking and placing the circuit board, the test time when the time for placing the circuit board is prolonged is increased, the production efficiency of the circuit board is reduced, the probe positions are fixed, the probe positions are not universal for the circuit boards of different models, and the test bench can only correspond to the circuit boards of one model, and the practicability is not good.
The circuit board testing platform proposed in CN200610001210.8 is used for performing a testing procedure after electrically connecting a circuit board, wherein the circuit board is provided with at least one first connecting portion located at a side edge and at least one second connecting portion located at a surface, and the circuit board testing platform includes: the device comprises a base, a first control assembly and a second control assembly. The circuit board test board forms a modular structure through the mutual assembling of the first control assembly and the second control assembly, does not need to follow the sequence during operation, does not need to additionally increase the foolproof structural design, and has the advantages of simple structure and convenient operation. In addition, because the supporting piece does not occupy the placing position of the circuit board, the circuit board can not touch the supporting piece and the second electrical switching part in the using process, and the circuit board can be easily taken and placed, so the circuit board test bench can improve the working convenience of a user and can save the test time.
The invention can test the circuit board through the controllable and movable measuring device, not only can be compatible with various types of circuit boards, but also can adapt to the size difference of various types of circuit boards through the placing device and the lifting device, so that the circuit boards with various types and sizes can be placed on the test equipment, and better test is facilitated.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a printed circuit board testing apparatus, which can test circuit boards through a controllable and movable measuring device, and is compatible with various types of circuit boards, and can adapt to the size difference of various types of circuit boards through a placing device and a lifting device, so that circuit boards of various types can be placed on the testing apparatus, thereby facilitating better testing.
The invention provides a printed circuit board testing device, which is characterized in that: the testing device comprises a base, a placing device used for fixing a circuit board, a measuring device capable of testing the circuit board and an extensible lifting device, wherein the placing device is fixed above the base, the measuring device is positioned above the placing device, the lifting device is fixed on the placing device, and the lifting device is positioned in the center of the placing device.
Further, the placing device comprises a first placing plate, a first shell, a mounting rod, a clamping plate, a connecting pipe, a sliding rod, a second placing plate and an adjusting knob, the first placing plate is fixed above the base, one end of the sliding rod is fixed behind the first placing plate, the other end of the sliding rod is fixed above the base, the second placing plate is installed above the sliding rod, the second placing plate is provided with the adjusting knob on the side face, the first placing plate and the second placing plate are provided with the first shell on two sides, the mounting rod is installed in the first shell, the clamping plate is rotatably installed at one end of the mounting rod, and the first shells on two sides are connected through the connecting pipe at the tail end.
Furthermore, the measuring device comprises a mounting seat, a motor, a mounting block, a first slide block, a first air cylinder and a second slide block, the second cylinder, the second shell, the feeler lever, first spring, the third shell, display module assembly and measurement module assembly, the motor is fixed in on the base through the mount pad, the installation piece is fixed in on the motor output shaft, first slider slidingtype is installed on the installation piece, installation piece one side is equipped with first cylinder, first cylinder telescopic link is fixed in first slider side, second slider slidingtype is installed in first slider end, the second cylinder is fixed in first slider top, second cylinder telescopic link is fixed in second slider rear, the second shell is fixed in second slider front end, the feeler lever passes through first spring slidingtype and installs in the second shell, the third shell is fixed in the base front end, be equipped with display module assembly in the third shell, the display module assembly both sides are equipped with measurement module assembly.
Furthermore, the lifting device comprises a second spring, a tray, a first movable block, a first supporting wheel, a second movable block and a second supporting wheel, the tray is slidably mounted on the sliding rod through a supporting frame, the two ends of the sliding rod are provided with corresponding second springs, the first movable block is slidably mounted on the side face of the tray, the first supporting wheel is rotatably mounted on the two sides of the first movable block, the second movable block is slidably mounted in the first movable block, and the second supporting wheel is rotatably mounted on the two sides of the second movable block.
Furthermore, the first shell is ring-shaped, and the side surface of the first shell is provided with a limit groove corresponding to the mounting rod.
Furthermore, the mounting rod is in an arc shape matched with the radian of the first shell, and one end of the mounting rod is provided with a piston head matched with the first shell.
Furthermore, the first board and the second board of placing are equipped with the turn-ups, and the first board of placing and the second board of placing top and splint below all are fixed with the antiskid ribbed tile, and the antiskid ribbed tile is made for elastic material.
Furthermore, a connecting port is arranged below the tray, a cavity structure is arranged in the tray, and the upper surface of the tray is a smooth plane.
Furthermore, first supporting wheel and second supporting wheel are made for insulating elastic material, and first supporting wheel upper surface and second supporting wheel upper surface all are in tray upper surface parallel and level.
Furthermore, the first movable block is provided with a through hole corresponding to the second movable block, and the second movable block is provided with a groove.
Has the beneficial effects that:
1. the circle-shaped structure of the first shell enables the clamping plate to be located above the side face of the first placing plate and the side face of the second placing plate after being loosened, the extending length of the first sliding block can be adjusted through the first air cylinder, the angle of the mounting block is adjusted through the motor, the measuring device and the placing device cannot interfere with the placing and feeding process of the printed circuit board, and the production efficiency of the printed circuit board is improved.
2. Can be through the extension length of first slider of first cylinder adjustment, through the angle of motor adjustment installation piece to change the position of feeler lever, make the position of wiring correspond on feeler lever and the printed circuit board, can adapt to different model printed circuit boards, improve the practicality.
3. The tray passes through the support frame slidingtype and installs on the slide bar, the slide bar both ends are equipped with corresponding second spring, make the tray be located between first backup pad and the second backup pad, thereby can lift printed circuit board middle part, first movable block slidingtype is installed in the tray side, second movable block slidable mounting is in first movable block, can control the flexible slip of first movable block and second movable block through the air pump, thereby the lifting scope of control lifting device, thereby can adapt to the printed circuit board of equidimension not, printed circuit board after lifting, the middle part can not be because of gravity and recessed, make the feeler lever can contact with the binding post on the printed circuit board better, be convenient for test printed circuit board.
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is an exploded view of the placement device of the present invention.
Fig. 3 is a schematic view of the overall structure of the measuring device of the present invention.
Fig. 4 is an exploded view of the measuring device of the present invention.
Fig. 5 is an exploded view in cross section of the present invention.
Fig. 6 is a schematic view of the overall structure of the lifting device of the present invention.
Fig. 7 is an exploded view of the lift device of the present invention.
Fig. 8 is an exploded view of the measuring device of the present invention.
Reference numerals: a base 1; a first placing plate 2; an antiskid plate 3; a first housing 4; a limiting groove 5; a mounting rod 6; a clamping plate 7; a connecting pipe 8; a mounting seat 9; a motor 10; a mounting block 11; a first slider 12; a first cylinder 13; a second slider 14; a second cylinder 15; a second housing 16; a feeler lever 17; a first spring 18; a tray 19; a connection port 20; a first movable block 21; a first support wheel 22; a second movable block 23; a second support wheel 24; a third housing 25; a display module 26; a measurement module 27; a second spring 28; a slide bar 29; a second placing plate 30; the knob 31 is adjusted.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments, and in order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below, which are, of course, merely examples and are not intended to limit the present invention.
Referring to the drawings, a printed circuit board testing apparatus according to an embodiment of the present invention is described, and as shown in fig. 1 to 8, the printed circuit board testing apparatus includes a base 1, a placement device for fixing a circuit board, a measuring device capable of testing the circuit board, and an extendable lifting device, wherein the placement device is fixed above the base 1, the measuring device is located above the placement device, the lifting device is fixed on the placement device, and the lifting device is located at the center of the placement device.
As shown in FIG. 2, the printed circuit board testing apparatus comprises a placing device, the placing device comprises a first placing plate 2, a first shell 4, a mounting rod 6, a clamping plate 7, a connecting pipe 8, a sliding rod 29, a second placing plate 30 and an adjusting knob 31, the first placing plate 2 is fixed above a base 1, one end of the sliding rod 29 is fixed behind the first placing plate 2, the other end of the sliding rod 29 is fixed above the base 1, the second placing plate 30 is installed above the sliding rod 29, the adjusting knob 31 is arranged on the side surface of the second placing plate 30, the first placing plate 2 and the second placing plate 30 are provided with flanges for fixing the circuit board, anti-skid plates 3 are fixed above the first placing plate 2 and the second placing plate 30 and below the clamping plate 7, the anti-skid plates 3 are made of elastic materials, the first shell 4 is arranged on two sides above the first placing plate 2 and the second placing plate 30, the mounting rod 6 is installed in the first shell 4, first shell 4 is the circle shape, and 4 side openings of first shell have with the spacing groove 5 that installation pole 6 corresponds, and installation pole 6 is for agreeing with the arc of 4 radians of first shell, and 6 one end of installation pole is equipped with the piston head that agrees with first shell 4, and splint 7 rotary type is installed in the 6 other ends of installation pole, and first shell 4 of both sides is connected through terminal connecting pipe 8, and external air pump is connected to connecting pipe 8.
In a specific embodiment: the second placing plate 30 is slidable on the slide bar 29 and fixed by a knob so as to accommodate printed circuit boards of different sizes.
During the test, printed circuit board places the board 30 top in first board 2 and the second of placing through artifical or external loading attachment, then control external air pump bleed or aerify first shell 4, thereby make installation pole 6 carry out corresponding gos forward or retreat, because the circle shape structure of first shell 4, make installation pole 6 carry out the arc motion, thereby make splint 7 carry out the arc motion, thereby to placing the printed circuit board that board 2 and the second placed on board 30 and press from both sides tightly or loosen first placing board 2 and the second, because the circle shape structure of first shell 4, make splint 7 to be located first board 2 and the second placed board 30 side top of placing after loosening, can not disturb printed circuit board's the material loading process of placing.
As shown in fig. 3, 4, 5 and 8, the printed circuit board testing apparatus includes a measuring device, the measuring device includes a mounting base 9, a motor 10, a mounting block 11, a first slider 12, a first cylinder 13, a second slider 14, a second cylinder 15, a second housing 16, a feeler lever 17, a first spring 18, a third housing 25, a display module 26 and a measuring module 27, the motor 10 is fixed on the base 1 through the mounting base 9, the mounting block 11 is fixed on an output shaft of the motor 10, the first slider 12 is slidably mounted on the mounting block 11, one side of the mounting block 11 is provided with the first cylinder 13, an expansion rod of the first cylinder 13 is fixed on a side surface of the first slider 12, the second slider 14 is slidably mounted at a tail end of the first slider 12, the second cylinder 15 is fixed above the first slider 12, the second cylinder 15 is fixed behind the second slider 14, the second housing 16 is fixed at a front end of the second slider 14, feeler lever 17 is through first spring 18 slidable type installation in second shell 16, and third shell 25 is fixed in base 1 front end, is equipped with display module assembly 26 in the third shell 25, and display module assembly 26 both sides are equipped with measuring module 27, and display module assembly 26 and measuring module 27 work through external power supply.
In a specific embodiment: after the printed circuit board is fixed through the placing device, the extending length of the first sliding block 12 is adjusted through the first air cylinder 13, the angle of the mounting block 11 is adjusted through the motor 10, the extending length corresponds to the position of a wiring point on the printed circuit board, the second sliding block 14 is controlled to move downwards through the second air cylinder 15, the contact rod 17 is made to contact the wiring point on the printed circuit board, the measurement module 27 arranged in the third shell 25 is used for measurement, the data between the wiring points are measured, the display module 26 is used for displaying, the line condition between the wiring points is judged, and the purpose of testing the printed circuit board is achieved.
As shown in fig. 6 and 7, the printed circuit board testing apparatus includes a lifting device, the lifting device includes a second spring 28, a tray 19, a first movable block 21, a first support wheel 22, a second movable block 23 and a second support wheel 24, the tray 19 is slidably mounted on a slide bar 29 through a support frame, a connection port 20 is provided below the tray 19, the tray 19 has a hollow structure, the upper surface of the tray 19 is a smooth plane to prevent the printed circuit board from being worn, the slide bar 29 has corresponding second springs 28 at both ends thereof to allow the tray 19 to be positioned between the first support plate and the second support plate to lift the middle portion of the printed circuit board, the first movable block 21 is slidably mounted at the side of the tray 19, the first support wheels 22 are rotatably mounted at both sides of the first movable block 21, the second movable block 23 is slidably mounted in the first movable block 21, the first movable block 21 has a through hole corresponding to the second movable block 23, the second movable block 23 is provided with a groove, the second supporting wheels 24 are rotatably mounted on two sides of the second movable block 23, the first supporting wheels 22 and the second supporting wheels 24 are made of insulating elastic materials, and the upper surfaces of the first supporting wheels 22 and the upper surfaces of the second supporting wheels 24 are flush with the upper surface of the tray 19.
In a specific embodiment: tray 19 connects the air pump through the connector 20 that the below set up to aerify in to tray 19 through the air pump, make second movable block 23 outwards stretch out under the effect of air current, continue to aerify, make second movable block 23 drive first movable block 21 outwards stretch out, thereby strengthen the lifting scope to printed circuit board, first supporting wheel 22 and second supporting wheel 24 can roll stretching out the in-process, thereby reduce the friction.
The working principle is as follows: during testing, the printed circuit board is placed above the first placing plate 2 and the second placing plate 30 through manual work or an external feeding device, then an external air pump is controlled to pump air or inflate the first shell 4, so that the mounting rod 6 correspondingly moves forwards or backwards, due to the ring-shaped structure of the first shell 4, the mounting rod 6 moves in an arc shape, so that the clamping plate 7 moves in an arc shape, so that the printed circuit boards placed on the first placing plate 2 and the second placing plate 30 are clamped or loosened, meanwhile, the tray 19 inflates the tray 19 through the air pump, so that the second movable block 23 extends outwards under the action of air flow, the inflation is continued, the second movable block 23 drives the first movable block 21 to extend outwards, so that the lifting range of the printed circuit boards is enlarged, then the extending length of the first sliding block 12 is adjusted through the first air cylinder 13, the angle of the mounting block 11 is adjusted through the motor 10, the angle corresponds to the positions of the wiring points on the printed circuit board, the second sliding block 14 is controlled to move downwards through the second air cylinder 15, the contact rod 17 is made to contact with the wiring points on the printed circuit board, then the measurement is carried out through the measuring module 27 arranged in the third shell 25, then data among the wiring points are measured, the data are displayed through the display module 26, the line condition among the wiring points is judged, and the purpose of testing the printed circuit board is achieved.
Claims (6)
1. Printed circuit board test equipment, its characterized in that: the testing device comprises a base, a placing device for fixing a circuit board, a measuring device capable of testing the circuit board and an extensible lifting device, wherein the placing device is fixed above the base; the placing device comprises a first placing plate, a first shell, an installing rod, a clamping plate, connecting pipes, a sliding rod, a second placing plate and an adjusting knob, wherein the first placing plate is fixed above the base; the measuring device comprises a mounting seat, a motor, a mounting block, a first sliding block, a first air cylinder, a second sliding block, a second air cylinder, a second shell, a feeler lever, a first spring, a third shell, a display module and a measuring module, the motor is fixed on the base through the mounting seat, the mounting block is fixed on an output shaft of the motor, the first sliding block is arranged on the mounting block in a sliding mode, one side of the mounting block is provided with a first air cylinder, an expansion rod of the first air cylinder is fixed on the side face of the first sliding block, the second sliding block is arranged at the tail end of the first sliding block in a sliding mode, the second air cylinder is fixed above the first sliding block, an expansion rod of the second air cylinder is fixed behind the second sliding block, the second shell is fixed at the front end of the second sliding block, the touch rod is arranged in the second shell in a sliding mode through a first spring, the third shell is fixed at the front end of the base, a display module is arranged in the third shell, and measuring modules are arranged on two sides of the display module;
The lifting device comprises a second spring, a tray, a first movable block, a first supporting wheel, a second movable block and a second supporting wheel, the tray is arranged on the sliding rod in a sliding mode through a supporting frame, the two ends of the sliding rod are provided with the corresponding second springs, the first movable block is arranged on the side face of the tray in a sliding mode, the first supporting wheel is rotatably arranged on the two sides of the first movable block, the second movable block is slidably arranged in the first movable block, and the second supporting wheel is rotatably arranged on the two sides of the second movable block;
the first shell is in a ring shape, and the side surface of the first shell is provided with a limiting groove corresponding to the mounting rod.
2. The printed circuit board testing apparatus of claim 1, wherein the mounting bar is arcuate to conform to the curvature of the first housing, the mounting bar having a piston head at one end that conforms to the first housing.
3. The printed circuit board testing apparatus of claim 1, wherein the first and second placing plates are provided with flanges, and anti-slip plates are fixed above the first and second placing plates and below the clamping plate, and the anti-slip plates are made of elastic material.
4. The printed circuit board testing apparatus of claim 1, wherein a connection port is provided below the tray, a cavity structure is provided in the tray, and an upper surface of the tray is a smooth plane.
5. The printed circuit board testing apparatus of claim 4, wherein the first support wheel and the second support wheel are made of an insulating elastic material, and an upper surface of the first support wheel and an upper surface of the second support wheel are flush with an upper surface of the tray.
6. The printed circuit board testing apparatus of claim 1, wherein the first movable block has a through hole corresponding to the second movable block, and the second movable block has a groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210353994.XA CN114428207B (en) | 2022-04-06 | 2022-04-06 | Printed circuit board testing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210353994.XA CN114428207B (en) | 2022-04-06 | 2022-04-06 | Printed circuit board testing equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114428207A CN114428207A (en) | 2022-05-03 |
| CN114428207B true CN114428207B (en) | 2022-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210353994.XA Active CN114428207B (en) | 2022-04-06 | 2022-04-06 | Printed circuit board testing equipment |
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| CN (1) | CN114428207B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101480800B (en) * | 2009-01-20 | 2011-01-05 | 宁波三盾电子科技有限公司 | Punching machine and punching method thereof for printed circuit board |
| US8836357B2 (en) * | 2011-04-23 | 2014-09-16 | Li-Cheng Richard Zai | Stackable probe system |
| JP5797240B2 (en) * | 2013-08-12 | 2015-10-21 | 太洋工業株式会社 | Printed circuit board inspection equipment |
| CN208488479U (en) * | 2018-07-05 | 2019-02-12 | 苏州银光电子有限公司 | ICT test machine for pcb board |
| CN209280766U (en) * | 2018-12-21 | 2019-08-20 | 深圳市维圳泰科技有限公司 | A kind of detection device for PCB circuit board |
| CN110404800B (en) * | 2019-06-26 | 2021-07-13 | 深圳市同创精密自动化设备有限公司 | Printed circuit board detection equipment and printed circuit board detection method |
| CN114113697A (en) * | 2021-10-25 | 2022-03-01 | 南京市同亮科技有限公司 | Circuit board detection tool and detection method |
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| CN114428207A (en) | 2022-05-03 |
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Effective date of registration: 20231208 Address after: Floor 5, No. 37, Langkou Industrial Park, Langkou Community, Dalang Street, Longhua District, Shenzhen, Guangdong 518000 Patentee after: Shenzhen Junyue Internet Technology Co.,Ltd. Address before: 518104 floor 4, building C, Dagang Dadi Industrial Zone, Dagang community, Shajing street, Bao'an District, Shenzhen, Guangdong Province Patentee before: SHENZHEN HENGXUNTONG ELECTRONICS Co.,Ltd. |
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