CN110389257A - A kind of production method for the integrating device and embedded resistors that embedded resistors are monitored online - Google Patents
A kind of production method for the integrating device and embedded resistors that embedded resistors are monitored online Download PDFInfo
- Publication number
- CN110389257A CN110389257A CN201910808173.9A CN201910808173A CN110389257A CN 110389257 A CN110389257 A CN 110389257A CN 201910808173 A CN201910808173 A CN 201910808173A CN 110389257 A CN110389257 A CN 110389257A
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- embedded resistors
- circuit board
- printed circuit
- resistance
- voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
- H05K1/182—Printed circuits structurally associated with non-printed electric components associated with components mounted in the printed circuit board, e.g. insert mounted components [IMC]
- H05K1/185—Components encapsulated in the insulating substrate of the printed circuit or incorporated in internal layers of a multilayer circuit
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/10022—Non-printed resistor
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- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Parts Printed On Printed Circuit Boards (AREA)
Abstract
The present invention relates to a kind of integrating devices that embedded resistors are monitored online, including conductive fixture, voltage or resistor detecting device, touch display screen, PLC, lifting device, bracket and lift dog；Voltage or resistor detecting device electrical connection conductive fixture, touch display screen and PLC；PLC is electrically connected touch display screen and lifting device；Lifting device, bracket and lift dog are sequentially connected, and conductive fixture is for the embedded resistors on clamping printed circuit board；Lift dog is used for clamping printed circuit board.Integrating device of the invention can solve the big problem of resistance error caused by due to technique sensitivity, the resistance value of chemical plating nickel-phosphorus alloy production embedded resistors can accurately be controlled, it is consistent the sheet resistance of potting formula resistance between different batches substantially, embedded resistors have good uniformity, and the relative error very little with standard electric resistance value, meets the error criterion of level-one device.Moreover, it relates to a kind of production method of embedded resistors.
Description
Technical field
The invention belongs to measure monitoring field, and in particular to a kind of integrating device and potting electricity of on-line monitoring embedded resistors
The production method of resistance.
Background technique
With the application of 5G mechanics of communication and the abruptly increase of high-speed high-performance electronic product, PCB development trend is tended to miniature
Change, intelligent, integrated and high stability the features such as.PCB is the most important mounting plate of electronic product, it is main there are two
Key effect: first is that the supporting body of installation, welding, fixation is provided for integrated circuit, inductance, capacitor and other functional modules, two
It is to provide electric interconnection by conducting wire and hole for above-mentioned electronic component and functional module.Since traditional passive device mounts
Printed circuit board surface pads can be made to increase in printed circuit plate surface, surface area increase, be easy to cause signal transmission unstable
Calmly, the disadvantages of electronic product reliability reduction, parasitic antenna influence of noise.It therefore, if can be by passive device potting to route
Intralamellar part will solve the above problems such as unstability, the low reliability of electronic product of signal transmission.Thus technical staff into
It has gone effort in many years, has finally realized the printed circuit board of the passive elements such as embedding resistance, inductance and capacitor.Circuit into
When row high frequency, high speed signal and digital data transmission, resistance is embedded in the mode in printed circuit board and not only shortens signal biography
Defeated distance improves frequency transmission signal and stability, and can save printed circuit board space surface, reduces electronic product
Overall weight reduces the parasitic parameter generated in signal transmission.Wherein potting formula resistance as passive element potting technology most
For main direction, become the research hotspot in technology industry.
The production of embedded resistors at present mainly has silk screen print method, etching metal thin film resistor method and sputtered metal film electricity
The methods of resistance method.Method for printing screen be by conductive material silk-screen printing on a printed circuit board, be formed by curing resistance.Wherein by
It is limited in by technological factors such as electrocondution slurry self character, scraper pressure, speed, this method processes the error of resistance product
It is usually larger, less strict circuit board is controlled for resistance precision.Sputtered metal film electric-resistivity method is by magnetron sputtering
Mode deposits tens nanometer to thick hundreds of nanometers of emtal alloy films on the copper foil for need to make resistance, then with PCB tree
Aliphatic radical plate is laminated forms embedded resistors together.Due to the process conditions that sputtering needs, such as the target that equipment and sputtering use
Etc. expensive, input cost height, therefore its resistance formed does not have significant price competitiveness.Etch metal thin film resistor method
It is that very thin nickel phosphorous layer will be electroplated on copper, then lamination is upside down on polymeric substrate, carries out two to nickel phosphorous layer and layers of copper
Secondary etching forms potting formula resistor.But second etch causes to increase processing step, so that entire process flow is complicated,
Also, the potting formula resistance error of the obtained different batches of method based on second etch after plating is substantially on 20% left side
The right side belongs to the error range of three-level electronic component, and the device of second level or even level-one is not achieved.To sum up, how to control and bury
The resistance value size for entering the resistor in printed circuit board, complies with measuring resistance resistance value, and easy to operate, at low cost, is print
Core technology during circuit board fabrication processed also becomes this field technical problem urgently to be resolved.
Summary of the invention
The technical problem to be solved by the present invention is in view of the problems of the existing technology, provide a kind of on-line monitoring potting
The production method of the integrating device and embedded resistors of resistance.
In order to solve the above technical problems, the present invention provides a kind of integrating device that embedded resistors are monitored online, including conduction
Fixture, voltage or resistor detecting device, touch display screen, PLC, lifting device, bracket and lift dog；
Voltage or resistor detecting device electrical connection conductive fixture, touch display screen and PLC；
PLC is electrically connected touch display screen and lifting device；
Lifting device, bracket and lift dog are sequentially connected；
Conductive fixture is for the embedded resistors on clamping printed circuit board；Lift dog is used for clamping printed circuit board.
The beneficial effects of the present invention are: integrating device of the invention can solve because technique sensitivity due to caused by resistance error it is big
The problem of, the resistance value of chemical plating nickel-phosphorus alloy production embedded resistors can be accurately controlled, potting formula resistance between different batches is made
Sheet resistance is consistent substantially, and embedded resistors have good uniformity, and the relative error very little with standard electric resistance value, meets level-one device
The error criterion of part, and for make embedded resistors when, it is easy to operate, it is at low cost.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the output electric current of voltage or resistor detecting device is 10 μ A-0.1mA.
Beneficial effect using above-mentioned further scheme is: the setting of the output electric current does not change nickel ion sedimentation potential,
To improve the accuracy of detection.
Further, the voltage or resistor detecting device are multimeter, digital sourcemeter or resistance meter；And/or institute
Stating touch display screen is capacitance touch screen, electric resistance touch screen, infrared touch panel or surface acoustic wave touch screen.
Further, the lifting device is cylinder elevator or stepper motor.
Further, the touch display screen is connected with the voltage or resistor detecting device by i/o communication interface；
And/or the PLC is connected with the voltage or resistor detecting device by i/o communication interface；And/or the touch display screen
It is connect with the PLC by serial interface.
Further, the conductive fixture and lift dog are acidproof, alkaline-resisting and resistant to high temperature fixture.
In order to solve the above technical problems, the present invention also provides a kind of production methods of embedded resistors, comprising steps of
S1: the conducting wire of printed circuit board is made；
S2: pre-treatment is carried out to the printed circuit board；
S3: the embedded resistors of printed circuit board are made；
Step S3 further includes using a kind of integrated dress that embedded resistors are monitored online described in any one of claims 1-6
Set the monitoring for carrying out embedded resistors.
The beneficial effects of the present invention are: method of the invention can solve due to technique sensitivity caused by resistance error is big asks
Topic can accurately control the resistance value of chemical plating nickel-phosphorus alloy production embedded resistors, make the sheet resistance of potting formula resistance between different batches
Substantially it is consistent, embedded resistors have good uniformity, and the relative error very little with standard electric resistance value, meet level-one device
Error criterion, and it is easy to operate, it is at low cost.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the step S1 specifically includes the following steps:
S11: photoresist layer is formed on the surface of double face copper；
S12: drying the double face copper for being formed with photoresist layer, and is exposed development by mask plate,
Realize the transfer of conductive pattern；
S13: etching solution is used, the double face copper is etched, removes the layers of copper of unexposed development；
S14: removing photoresist layer.
Further, the step S2 specifically includes the following steps:
S21: printed circuit board being put into alkaline solution and carries out oil removal treatment, the oil removing time are as follows: 10min, the alkalinity
Solution includes: NaOH:25g/L, Na2CO3: 35g/L, Na3PO4: 50g/L；
S22: sensitized treatment, sensitized treatment time are as follows: 4min, the solution packet of the sensitized treatment are carried out to printed circuit board
Contain: SnCl2: 40g/L and HCl:100mL/L；
S23: printed circuit board immersion deionized water is hydrolyzed, gelatinous tin salt, hydrolysis time are formed
Are as follows: 3 minutes；
S24: after printed circuit board is carried out deionized water cleaning, being activated, and the time is activated are as follows: and 3 minutes,
The solution of activation processing includes: PdCl2: 0.5g/L and HCl:10mL/L.
Further, the step S3 specifically includes the following steps:
Printed circuit board is put into the production for carrying out embedded resistors in chemical nickel-plating liquid, and uses a kind of on-line monitoring potting
The integrating device of resistance carries out the monitoring of embedded resistors, when the voltage or resistance that monitor embedded resistors reach the electricity of measuring resistance
When pressure or resistance, it will be taken out in printed circuit board chemically nickel-plating liquid.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of on-line monitoring embedded resistors integrating device of the invention.
In attached drawing, parts list represented by the reference numerals are as follows:
1, conductive fixture, 2, voltage or resistor detecting device, 3, touch display screen, 4, PLC, 5, lifting device, 6, bracket,
7, lift dog, 8, printed circuit board, 9, embedded resistors.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
As shown in Figure 1, the first embodiment of the present invention provides a kind of integrating device that embedded resistors are monitored online, including lead
Electric clamp 1, voltage or resistor detecting device 2, touch display screen 3, PLC4, lifting device 5, bracket 6 and lift dog 7；
Voltage or resistor detecting device 2 are electrically connected conductive fixture 1, touch display screen 3 and PLC4；
PLC4 is electrically connected touch display screen 3 and lifting device 5；
Lifting device 5, bracket 6 and lift dog 7 are sequentially connected；
Conductive fixture 1 is for the embedded resistors 9 on clamping printed circuit board 8；Lift dog 7 is used for clamping printed circuit board
8。
Above-described embodiment can solve the big problem of resistance error caused by due to technique sensitivity, can accurately control chemical plating
Nickel-phosphorus alloy makes the resistance value of embedded resistors, is consistent the sheet resistance of potting formula resistance between different batches substantially, embedded resistors
It has good uniformity, and the relative error very little with standard electric resistance value, meets the error criterion of level-one device, and bury for making
It is easy to operate when embedding resistance, it is at low cost.The production method good compatibility of the device and existing potting formula resistor is, it can be achieved that big
The potting of resistance resistors is conducive to circuit design, large-scale promotion and application.
Wherein, conductive fixture 1 realizes the clamping to the embedded resistors 9 on printed circuit board 8, the voltage or resistance detection
Device 2 realizes the measurement to the real-time voltage or real time resistance of the embedded resistors 9 on printed circuit board 8；PLC4 collection voltages or
The real-time voltage or real time resistance that resistor detecting device 2 detects, and by the AD conversion in PLC4 by real-time voltage or in real time
The real-time analog quantity of resistance is converted to real-time digital amount, which is stored in the internal register of PLC, passes through PLC4 later
In compare instruction, to the standard digital amount being previously stored in the real-time digital amount and internal register of real-time voltage or resistance
It is compared, when real-time digital amount reaches standard digital amount, PLC4 sends control pulse, and the driver for controlling lifting device is dynamic
Make, to make lifting device that bracket 6 and lift dog 7 be driven to do ascending motion, printed circuit board 8 taken out from bath trough,
Terminate the process of plating production embedded resistors.Touch display screen 3 realizes the display of real-time voltage or real time resistance, and realizes warp
Cross PLC treated the display of real-time digital amount, furthermore, it is possible to by touch display screen 3 to the standard digital amount in PLC4 into
Row setting.
Optionally, the output electric current of voltage or resistor detecting device 2 is 10 μ A-0.1mA.
In above-described embodiment, the setting for exporting electric current does not change nickel ion sedimentation potential, to improve the accuracy of detection.
Optionally, the voltage or resistor detecting device 2 are multimeter, digital sourcemeter or resistance meter；And/or institute
Stating touch display screen 3 is capacitance touch screen, electric resistance touch screen, infrared touch panel or surface acoustic wave touch screen.
Optionally, the lifting device is cylinder elevator or stepper motor.
Optionally, the touch display screen 3 is connected with the voltage or resistor detecting device 2 by i/o communication interface；
And/or the PLC4 is connected with the voltage or resistor detecting device 2 by i/o communication interface；And/or the touch display
Screen 3 is connect with the PLC4 by serial interface.
Optionally, the conductive fixture 1 and lift dog 7 are acidproof, alkaline-resisting and resistant to high temperature fixture.
The second embodiment of the present invention provides a kind of production method of embedded resistors, comprising steps of
S1: the conducting wire of production printed circuit board 8；
S2: pre-treatment is carried out to the printed circuit board 8；
S3: the embedded resistors 9 of production printed circuit board 8；
Step S3 further includes using a kind of integrated dress that embedded resistors are monitored online described in any one of claims 1-6
Set the monitoring for carrying out embedded resistors.
Above-described embodiment can solve the big problem of resistance error caused by due to technique sensitivity, can accurately control chemical plating
Nickel-phosphorus alloy makes the resistance value of embedded resistors, is consistent the sheet resistance of potting formula resistance between different batches substantially, embedded resistors
It has good uniformity, and the relative error very little with standard electric resistance value, meets the error criterion of level-one device, and easy to operate,
It is at low cost.
Optionally, the step S1 specifically includes the following steps:
S11: photoresist layer is formed on the surface of double face copper；
S12: drying the double face copper for being formed with photoresist layer, and is exposed development by mask plate,
Realize the transfer of conductive pattern；
S13: etching solution is used, the double face copper is etched, removes the layers of copper of unexposed development；
S14: removing photoresist layer.
In above-described embodiment, the double face copper is made a living 100 μm of medium thickness of the production of beneficial company, thick 12 μm of the ring of copper
Oxygen resin double face copper；The photoresist layer is to be suppressed by coating wet film or patch dry film；The Exposure mode is
Using film Exposure mode or laser direct imaging mode；The etching solution is acidic etching solution or alkaline etch solution.
Optionally, the step S2 specifically includes the following steps:
S21: printed circuit board being put into alkaline solution and carries out oil removal treatment, the oil removing time are as follows: 10min, the alkalinity
Solution includes: NaOH:25g/L, Na2CO3: 35g/L, Na3PO4: 50g/L；
S22: sensitized treatment, sensitized treatment time are as follows: 4min, the solution packet of the sensitized treatment are carried out to printed circuit board
Contain: SnCl2: 40g/L and HCl:100mL/L；
S23: printed circuit board immersion deionized water is hydrolyzed, gelatinous tin salt, hydrolysis time are formed
Are as follows: 3 minutes；
S24: after printed circuit board is carried out deionized water cleaning, being activated, and the time is activated are as follows: and 3 minutes,
The solution of activation processing includes: PdCl2: 0.5g/L and HCl:10mL/L.
In above-described embodiment, after being activated, make Pd20Pd atomic adsorption is reduced into the surface of conducting wire, shape
Start center at chemical plating self-catalysis, convenient for the production of embedded resistors.
Optionally, the step S3 specifically includes the following steps:
Printed circuit board 8 is put into the production for carrying out embedded resistors 9 in chemical nickel-plating liquid, and is buried using a kind of on-line monitoring
The integrating device of embedding resistance carries out the monitoring of embedded resistors, when the voltage or resistance that monitor embedded resistors reach measuring resistance
When voltage or resistance, it will be taken out in printed circuit board 8 chemically nickel-plating liquid.
A kind of integrating device of on-line monitoring embedded resistors of the invention can solve resistance value caused by due to technique sensitivity and miss
The big problem of difference can accurately control the resistance value of chemical plating nickel-phosphorus alloy production embedded resistors, make potting formula electricity between different batches
The sheet resistance of resistance is consistent substantially, and embedded resistors have good uniformity, and the relative error very little with standard electric resistance value, meets one
The error criterion of grade device, and the manufacture craft good compatibility of the device and existing embedded resistors is, it can be achieved that big valued resistor
The monitoring of device is conducive to circuit design, it can be achieved that large-scale promotion and application in printed circuit board industry.One kind of the invention
The production method of embedded resistors, it is easy to operate, it is at low cost, and can realize the accurate control of embedded resistors resistance value.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of integrating device that embedded resistors are monitored online, which is characterized in that examined including conductive fixture (1), voltage or resistance
Survey device (2), touch display screen (3), PLC (4), lifting device (5), bracket (6) and lift dog (7)；
Voltage or resistor detecting device (2) electrical connection conductive fixture (1), touch display screen (3) and PLC (4)；
PLC (4) is electrically connected touch display screen (3) and lifting device (5)；
Lifting device (5), bracket (6) and lift dog (7) are sequentially connected；
Conductive fixture (1) is for the embedded resistors (9) on clamping printed circuit board (8)；Lift dog (7) is for clamping printing electricity
Road plate (8).
2. a kind of integrating device that embedded resistors are monitored online according to claim 1, it is characterised in that: voltage or resistance
The output electric current of detection device (2) is 10 μ A-0.1mA.
3. it is according to claim 1 it is a kind of be monitored online embedded resistors integrating device, it is characterised in that: the voltage or
Resistor detecting device (2) is multimeter, digital sourcemeter or resistance meter；And/or the touch display screen (3) is capacitive touch
Touch screen, electric resistance touch screen, infrared touch panel or surface acoustic wave touch screen.
4. a kind of integrating device that embedded resistors are monitored online according to claim 1, it is characterised in that: the lifting dress
Setting (5) is cylinder elevator or stepper motor.
5. a kind of integrating device that embedded resistors are monitored online according to claim 1, it is characterised in that: described touch shows
Display screen (3) is connected with the voltage or resistor detecting device (2) by i/o communication interface；And/or the PLC (4) and described
Voltage or resistor detecting device (2) are connected by i/o communication interface；And/or the touch display screen (3) and the PLC (4)
It is connected by serial interface.
6. a kind of integrating device that embedded resistors are monitored online according to claim 1, it is characterised in that: the conductive clip
Have (1) and lift dog (7) is acidproof, alkaline-resisting and resistant to high temperature fixture.
7. a kind of production method of embedded resistors, comprising steps of
S1: the conducting wire of production printed circuit board (8)；
S2: pre-treatment is carried out to the printed circuit board (8)；
S3: the embedded resistors (9) of production printed circuit board (8)；
It is characterized in that, step S3 further includes, a kind of on-line monitoring embedded resistors described in any one of claims 1-6 are used
The monitoring of integrating device progress embedded resistors.
8. a kind of production method of embedded resistors according to claim 7, which is characterized in that the step S1 is specifically included
Following steps:
S11: photoresist layer is formed on the surface of double face copper；
S12: drying the double face copper for being formed with photoresist layer, and is exposed development by mask plate, realizes
The transfer of conductive pattern；
S13: etching solution is used, the double face copper is etched, removes the layers of copper of unexposed development；
S14: removing photoresist layer.
9. a kind of production method of embedded resistors according to claim 7, which is characterized in that the step S2 is specifically included
Following steps:
S21: printed circuit board being put into alkaline solution and carries out oil removal treatment, the oil removing time are as follows: 10min, the alkaline solution
Include: NaOH:25g/L, Na2CO3: 35g/L, Na3PO4: 50g/L；
S22: sensitized treatment is carried out to printed circuit board, the sensitized treatment time are as follows: the solution of 4min, the sensitized treatment include:
SnCl2: 40g/L and HCl:100mL/L；
S23: printed circuit board immersion deionized water is hydrolyzed, forms gelatinous tin salt, hydrolysis time are as follows: 3
Minute；
S24: after printed circuit board is carried out deionized water cleaning, being activated, and the time is activated are as follows: and 3 minutes, activation
The solution of processing includes: PdCl2: 0.5g/L and HCl:10mL/L.
10. a kind of production method of embedded resistors according to claim 7, which is characterized in that the step S3 is specifically wrapped
Include following steps:
Printed circuit board (8) is put into the production for carrying out embedded resistors (9) in chemical nickel-plating liquid, and is buried using a kind of on-line monitoring
The integrating device of embedding resistance carries out the monitoring of embedded resistors, when the voltage or resistance that monitor embedded resistors reach measuring resistance
When voltage or resistance, it will be taken out in printed circuit board (8) chemically nickel-plating liquid.
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| CN105848429A (en) * | 2016-05-06 | 2016-08-10 | 衢州顺络电子有限公司 | Manufacturing method for printed circuit board capable of replacing embedded resistor design |
| CN106400100A (en) * | 2016-10-18 | 2017-02-15 | 湖北帕尔森机电设备有限公司 | Full-automatic electropolishing equipment |
| CN107974704A (en) * | 2017-12-14 | 2018-05-01 | 中国工程物理研究院激光聚变研究中心 | A kind of electroplating bath cathode moving device rotated and move back and forth |
| CN109859919A (en) * | 2019-03-04 | 2019-06-07 | 电子科技大学 | A method of reducing potting formula resistance error |
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Application publication date: 20191029 |