CN115008107A - Welding method of liquid crystal display of vehicle-mounted instrument and pressing tool thereof - Google Patents
Welding method of liquid crystal display of vehicle-mounted instrument and pressing tool thereof Download PDFInfo
- Publication number
- CN115008107A CN115008107A CN202210778963.9A CN202210778963A CN115008107A CN 115008107 A CN115008107 A CN 115008107A CN 202210778963 A CN202210778963 A CN 202210778963A CN 115008107 A CN115008107 A CN 115008107A
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- pcb
- liquid crystal
- welding
- bottom plate
- pressing
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 69
- 238000003466 welding Methods 0.000 title claims abstract description 60
- 238000003825 pressing Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000002184 metal Substances 0.000 claims description 14
- 239000003381 stabilizer Substances 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 4
- 238000005476 soldering Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920001342 Bakelite® Polymers 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000004637 bakelite Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass
- B23K37/04—Auxiliary devices or processes, not specially adapted for a procedure covered by only one of the other main groups of this subclass for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The invention relates to a welding method of a liquid crystal screen of a vehicle-mounted instrument and a pressing tool thereof, wherein the welding pressing tool of the liquid crystal screen of the vehicle-mounted instrument comprises a tool bottom plate, the section of the tool bottom plate is rectangular, four pressure spring bases are fixed at four corners of the top of the tool bottom plate, the number of the pressure spring bases is four, the top ends of the two pressure spring bases on one side are rotatably connected with pressure springs, the top of the tool bottom plate is used for placing a PCB (printed circuit board), a PCB pressing plate is arranged above the PCB, two symmetrically distributed positioning grooves penetrate through the surface of the PCB pressing plate and are used for placing the liquid crystal screen, a liquid crystal screen pressing plate is arranged on the positioning grooves, welding pins are fixed at the bottom end of the liquid crystal screen, tube pin holes penetrate through the PCB pressing plate and the tool bottom plate, and the welding pins penetrate through the tube pin holes and are positioned below the tool bottom plate. The problem that in the prior art, on one hand, the accuracy of the welding position of a device is not high is solved; on the other hand, the manual operation is inconvenient, the efficiency is low and the like.
Description
Technical Field
The invention relates to the technical field of liquid crystal screen welding, in particular to a welding method and a pressing tool for a liquid crystal screen of a vehicle-mounted instrument.
Background
Regarding the liquid crystal display screen requiring the soldering of the plug-in unit on the PCB, the conventional soldering method is generally the same as the soldering method of other resistance-capacitance plug-in units, i.e. the manual one hand holds the device and the other hand is used for soldering.
The traditional welding method mainly has the following problems: on one hand, the accuracy of the welding position of the device is not high; on the other hand, manual operation is inconvenient and low in efficiency.
In order to solve the above-mentioned drawbacks, a technical solution is now provided.
Disclosure of Invention
The invention aims to provide a welding method of a liquid crystal display screen of a vehicle-mounted instrument and a pressing tool thereof.
The technical problems to be solved by the invention are as follows:
the invention solves the problem of ensuring the accuracy of the welding position and improving the operability.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a welding of on-vehicle instrument LCD screen compresses tightly frock, including the frock bottom plate, the cross-section of frock bottom plate is the rectangle, four angle departments in the top of frock bottom plate all are fixed with the pressure spring base, the number of pressure spring base is four, wherein the top of two pressure spring bases of one side is rotated and is connected with the pressure spring, the top of frock bottom plate is used for placing the PCB board, the top of PCB board is equipped with the PCB clamp plate, the constant head tank of seting up two symmetric distributions is run through on the PCB clamp plate surface, the constant head tank is used for placing the LCD screen, be provided with the LCD screen clamp plate on the constant head tank, the bottom mounting of LCD screen has the welding pin, all run through on PCB clamp plate and the frock bottom plate and seted up the pin hole, the welding pin passes the pipe pin hole and is located the below of frock bottom plate.
Furthermore, the end part of the pressure spring is connected with the top end of the pressure spring base through a bolt, and the pressure spring is a metal elastic part.
Furthermore, two symmetrically distributed positioning holes penetrate through the surface of one side of the PCB, positioning pins matched with the positioning holes are fixed at two ends of one side of the top of the tool bottom plate, and the diameter of each positioning pin is mm.
Furthermore, the cross section of the PCB pressing plate is rectangular, four corners of the bottom of the PCB pressing plate are respectively fixed with a pressing column, the bottom of the PCB pressing plate is fixed with two symmetrically distributed positioning columns, and the PCB is provided with two positioning ports matched with the positioning columns.
Furthermore, a liquid crystal display screen support is fixed in the positioning groove.
Furthermore, strong magnets are fixed on two sides of the liquid crystal screen pressing plate, magnetic metal is arranged on two sides of the positioning groove, and the magnetic metal is fixed on the top of the PCB pressing plate.
Further, four corners of the top of the tool bottom plate are all fixed with top support legs, the top support legs are located on the outer side of the pressure spring base, the length of the top support legs is larger than that of the pressure spring base, and four corners of the bottom of the tool bottom plate are all fixed with bottom support legs.
A welding method of a liquid crystal display of a vehicle-mounted instrument comprises the following steps:
step one, the two pressure springs are respectively rotated to the left side and the right side, and then the PCB is installed on the tool bottom plate through a positioning pin on the tool bottom plate;
secondly, placing the PCB pressing plate on the PCB through two positioning columns, and rotating the pressure spring towards the middle to press the PCB pressing plate;
step three, respectively placing the liquid crystal screens in the positioning grooves through the liquid crystal screen supports, shaking the liquid crystal screens to ensure that the liquid crystal screens are placed in place, covering the liquid crystal screens with the liquid crystal screen pressing plates, and attracting the liquid crystal screens with magnetic metal through the strong magnets to ensure that the liquid crystal screen pressing plates are accurate in position and firm in combination;
turning the whole tool by 180 degrees to enable the welding pins to be upward, integrally sending the pressing tool into welding equipment for welding, and detecting welding spots of the welded PCB after the welding of the welding equipment is finished;
and step five, taking down the welded PCB, horizontally placing the tool bottom plate on a workbench after integrally turning 180 degrees, sequentially taking down the liquid crystal display pressing plate and the PCB pressing plate, and then taking out the welded PCB and transferring to the next process.
The invention has the beneficial effects that:
according to the invention, the positioning pin is matched with the positioning hole to limit the position of the PCB, so that the accurate positioning of the PCB is ensured, the PCB can be positioned by matching the PCB with the pressure spring, the positioning column and the positioning port are arranged, so that the position of the PCB on the PCB can be accurately and conveniently obtained, meanwhile, the pressure spring can compress the PCB, the top of the liquid crystal screen support is used for placing the liquid crystal screen, the liquid crystal screen can be positioned, the liquid crystal screen is accurately welded on the PCB, the liquid crystal screen pressure plate is positioned by matching of the powerful magnet and the magnetic metal, the liquid crystal screen is ensured to be compressed, the whole process is accurately positioned, and the accuracy of the position of a welding pin when the liquid crystal screen is welded is ensured.
According to the invention, the convenience of turning the PCB for 180 degrees can be ensured, the liquid crystal display is placed in the positioning groove and positioned by the liquid crystal display pressing plate, so that the liquid crystal display can be quickly and stably turned, the production efficiency is improved, the working hours are saved, and the convenience of turning in the welding process is ensured.
Drawings
The invention is described in further detail below with reference to the figures and specific embodiments.
FIG. 1 is a flow chart of a welding method of a liquid crystal display of a vehicle instrument;
FIG. 2 is a schematic structural diagram of a welding and pressing tool for a liquid crystal display screen of a vehicle-mounted instrument;
FIG. 3 is a side view of a welding and pressing tool for a liquid crystal display of a vehicle-mounted instrument;
FIG. 4 is a bottom view of the welding and pressing tool for the liquid crystal display screen of the vehicle-mounted instrument;
FIG. 5 is an enlarged view taken at A of FIG. 2 in accordance with the present invention;
FIG. 6 is a schematic diagram of the structure of the liquid crystal panel pressing plate of the present invention.
In the figure: 1. a tooling bottom plate; 2. a pressure spring base; 3. a pressure spring; 4. positioning pins; 5. a PCB pressing plate; 6. a liquid crystal screen pressing plate; 7. a top leg; 8. a bottom leg; 9. welding pins; 501. positioning a groove; 502. a liquid crystal screen bracket; 601. a strong magnet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, the present invention provides a technical solution:
a welding method of a liquid crystal display of a vehicle-mounted instrument comprises the following steps:
step one, two pressure springs 3 are respectively rotated to the left side and the right side, and then the PCB is installed on the tool bottom plate 1 through two positioning pins 4 on the tool bottom plate 1;
secondly, placing the PCB pressing plate 5 on the PCB through two positioning columns, and rotating the two pressure springs 3 towards the middle to press the PCB pressing plate 5;
step three, respectively placing the two liquid crystal screens in the positioning grooves 501 through the liquid crystal screen supports 502, shaking the liquid crystal screens to ensure that the liquid crystal screens are placed in place, covering the two liquid crystal screen pressing plates 6 on the liquid crystal screens, and attracting the magnetic metal through the strong magnets 601 to ensure that the liquid crystal screen pressing plates 6 are accurate in position and firm in combination;
turning the whole tool by 180 degrees to enable the welding pins 9 to be upward, integrally sending the tool bottom plate 1 into welding equipment for welding, completing welding of the welding equipment, and detecting welding spots of the welded PCB;
and step five, taking down the welded PCB, horizontally placing the tool bottom plate 1 on a workbench after integrally turning 180 degrees, sequentially taking down the liquid crystal display pressing plate 6 and the PCB pressing plate 5, then taking out the welded PCB and transferring to the next process.
The welding pins 9 which need to be checked before the liquid crystal screen is placed cannot be deformed, otherwise, the welding pins are not easily aligned with the pin holes on the PCB, and the liquid crystal screen is not placed in place.
A welding and compressing tool for a liquid crystal display of a vehicle-mounted instrument comprises a tool bottom plate 1, wherein the section of the tool bottom plate 1 is rectangular, the tool bottom plate 1 is made of red or black bakelite, four pressure spring bases 2 are fixed at four corners of the top of the tool bottom plate 1, the number of the pressure spring bases 2 is four, the top ends of the two pressure spring bases 2 on one side are rotatably connected with pressure springs 3, and the end parts of the pressure springs 3 are connected with the top ends of the pressure spring bases 2 through bolts, so that the pressure springs 3 can rotate at the top ends of the pressure spring bases 2, the rotating resistance of the pressure springs 3 can be adjusted through the tightness of the adjusting bolts, the pressure springs 3 are metal elastic pieces, and the pressure springs 3 are made of stainless steel;
the top of the tool bottom plate 1 is used for placing a PCB, two locating holes which are symmetrically distributed are formed in the surface of one side of the PCB, locating pins 4 matched with the locating holes are fixed at two ends of one side of the top of the tool bottom plate 1, the diameter of each locating pin 4 is 3mm, and the locating pins 4 are matched with the locating holes to limit the position of the PCB, so that accurate locating of the PCB is guaranteed.
The top of PCB board is equipped with PCB clamp plate 5, PCB clamp plate 5's cross-section is the rectangle, PCB clamp plate 5's material is the ya keli board, four angle departments in PCB clamp plate 5's bottom all are fixed with the compression leg, PCB clamp plate 5's bottom is fixed with the reference column of two symmetric distributions, set up two on the PCB board with the location mouth of reference column looks adaptation, the compression leg is the elastic rubber material, avoid causing the injury to the PCB board when can compressing tightly the PCB board, PCB clamp plate 5 cooperation pressure spring 3 can fix a position the PCB board, set up reference column and location mouth, the accurate PCB clamp plate 5 position on the PCB board of being convenient for, simultaneously pressure spring 3 can compress tightly PCB clamp plate 5.
The 5 surfaces of PCB clamp plate run through the constant head tank 501 who sets up two symmetric distributions, and constant head tank 501 is used for placing the LCD screen, and constant head tank 501 internal fixation has LCD screen support 502, and the top of LCD screen support 502 is used for placing the LCD screen to can fix a position the LCD screen, guarantee that the accurate welding of LCD screen is on the PCB board.
Be provided with LCD screen clamp plate 6 on the constant head tank 501, LCD screen clamp plate 6's both sides all are fixed with powerful magnet 601, and wherein, the both sides of constant head tank 501 all are equipped with magnetic metal, and magnetic metal fixes at PCB clamp plate 5's top, fixes a position LCD screen clamp plate 6 through powerful magnet 601 and magnetic metal's cooperation, guarantees that LCD screen clamp plate 6 compresses tightly the LCD screen.
Four angle departments in the top of tool bottom plate 1 all are fixed with top stabilizer blade 7, and top stabilizer blade 7 is located the outside of pressure spring base 2, and the length of top stabilizer blade 7 is greater than the length of pressure spring base 2, and four angle departments in the bottom of tool bottom plate 1 all are fixed with end stabilizer blade 8.
The bottom mounting of LCD screen has welding pin 9, all runs through on PCB clamp plate 5 and the frock bottom plate 1 and has seted up the pin hole, and thereby welding pin 9 passes the pin hole and is located the below of frock bottom plate 1, thereby welds two LCD screens on the PCB board through welding pin 9.
The pressure spring base 2, the top supporting leg 7 and the bottom supporting leg 8 are all fixed on the tool bottom plate 1 through bolts.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (8)
1. A welding and pressing tool for a liquid crystal display of a vehicle-mounted instrument comprises a tool bottom plate (1), wherein the section of the tool bottom plate (1) is rectangular, it is characterized in that four corners of the top of the tool bottom plate (1) are respectively fixed with a pressure spring base (2), wherein the top of two pressure spring bases (2) of one side is rotated and is connected with pressure spring (3), the top of frock bottom plate (1) is used for placing the PCB board, the top of PCB board is equipped with PCB clamp plate (5), PCB clamp plate (5) surface runs through constant head tank (501) of seting up two symmetric distribution, constant head tank (501) are used for placing the LCD screen, be provided with LCD screen clamp plate (6) on constant head tank (501), the bottom mounting of LCD screen has welding pin (9), all run through on PCB clamp plate (5) and frock bottom plate (1) and seted up the pin hole, welding pin (9) pass the pin hole and are located the below of frock bottom plate (1).
2. The welding of on-vehicle instrument LCD screen compresses tightly frock of claim 1, characterized in that, be connected through the bolt between the tip of pressure spring (3) and the top of pressure spring base (2), pressure spring (3) can rotate on pressure spring base (2) top, pressure spring (3) are metal elastic component.
3. The welding and pressing tool for the liquid crystal display screen of the vehicle-mounted instrument according to claim 1, wherein positioning pins (4) matched with the positioning holes in the PCB are fixed at two ends of one side of the top of the tool bottom plate (1), and the diameter of each positioning pin (4) is 3 mm.
4. The welding and pressing tool for the liquid crystal display screen of the vehicle-mounted instrument according to claim 1, wherein the cross section of the PCB pressing plate (5) is rectangular, four corners of the bottom of the PCB pressing plate (5) are respectively fixed with a pressing column, and two symmetrically distributed positioning columns matched with the positioning holes in the PCB are fixed at the bottom of the PCB pressing plate (5).
5. The welding and pressing tool for the liquid crystal display screen of the vehicle-mounted instrument according to claim 1, characterized in that a liquid crystal display screen support (502) is fixed in the positioning groove (501).
6. The welding and pressing tool for the liquid crystal display screen of the vehicle-mounted instrument according to claim 1, wherein strong magnets (601) are fixed to two sides of the liquid crystal display screen pressing plate (6), magnetic metal is arranged on two sides of the positioning groove (501), and the magnetic metal is fixed to the top of the PCB pressing plate (5).
7. The welding of on-vehicle instrument LCD screen compresses tightly frock of claim 1, characterized in that, four angle departments in the top of frock bottom plate (1) all are fixed with top stabilizer blade (7), and top stabilizer blade (7) are located the outside of pressure spring base (2), and the length of top stabilizer blade (7) is greater than the length of pressure spring base (2), and four angle departments in the bottom of frock bottom plate (1) all are fixed with end stabilizer blade (8).
8. A welding method of a liquid crystal display screen of a vehicle-mounted instrument is characterized by comprising the following steps:
step one, the two pressure springs (3) are respectively rotated to the left side and the right side, and then the PCB is installed on the tool bottom plate (1) through two positioning pins (4) on the tool bottom plate (1);
secondly, placing the PCB pressing plate (5) on the PCB through two positioning columns, and then rotating the two pressing springs (3) towards the middle to press the PCB pressing plate (5);
step three, respectively placing the two liquid crystal screens in the positioning grooves (501) through the liquid crystal screen supports (502), shaking the liquid crystal screens to ensure that the liquid crystal screens are placed in place, covering the two liquid crystal screen pressing plates (6) on the liquid crystal screens, and attracting the liquid crystal screen pressing plates with magnetic metal through the powerful magnets (601) to ensure that the liquid crystal screen pressing plates (6) are accurate in position and firm in combination;
turning the whole tool bottom plate (1) by 180 degrees to enable the welding pins (9) to face upwards, integrally sending the tool bottom plate (1) into welding equipment for welding, finishing welding of the welding equipment, and detecting welding spots of the welded PCB;
and fifthly, taking down the welded PCB, horizontally placing the tool bottom plate (1) on a workbench after integrally turning 180 degrees, sequentially taking down the liquid crystal display pressing plate (6) and the PCB pressing plate (5), and then taking out the welded PCB and transferring to the next process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210778963.9A CN115008107A (en) | 2022-06-30 | 2022-06-30 | Welding method of liquid crystal display of vehicle-mounted instrument and pressing tool thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210778963.9A CN115008107A (en) | 2022-06-30 | 2022-06-30 | Welding method of liquid crystal display of vehicle-mounted instrument and pressing tool thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115008107A true CN115008107A (en) | 2022-09-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210778963.9A Pending CN115008107A (en) | 2022-06-30 | 2022-06-30 | Welding method of liquid crystal display of vehicle-mounted instrument and pressing tool thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115008107A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0505076A1 (en) * | 1991-03-22 | 1992-09-23 | International Business Machines Corporation | Pressing apparatus and method |
| CN104289843A (en) * | 2013-07-15 | 2015-01-21 | 中国二冶集团有限公司 | Control method for mounting deformation of electrolytic cell bottom plate |
| CN110919119A (en) * | 2019-11-27 | 2020-03-27 | 武汉心浩智能科技有限公司 | 5G dielectric filter assembly line tool clamp and method |
| CN211840759U (en) * | 2020-03-16 | 2020-11-03 | 洛阳航达新材料科技有限公司 | Welding tool for titanium electrode plate conducting rod |
| CN212191884U (en) * | 2020-04-29 | 2020-12-22 | 深圳市威线科电子有限公司 | Branching device |
| CN213794934U (en) * | 2020-10-27 | 2021-07-27 | 广州世晨通信技术有限公司 | Special frock clamp of antenna element welding |
| CN214392733U (en) * | 2020-12-23 | 2021-10-15 | 杭州华扬电子有限公司 | An LCD screen hand welding aid |
| CN216421367U (en) * | 2021-12-21 | 2022-05-03 | 湖北特林节能设备有限公司 | Automatic soldering tool bracket for PCB (printed circuit board) |
-
2022
- 2022-06-30 CN CN202210778963.9A patent/CN115008107A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0505076A1 (en) * | 1991-03-22 | 1992-09-23 | International Business Machines Corporation | Pressing apparatus and method |
| CN104289843A (en) * | 2013-07-15 | 2015-01-21 | 中国二冶集团有限公司 | Control method for mounting deformation of electrolytic cell bottom plate |
| CN110919119A (en) * | 2019-11-27 | 2020-03-27 | 武汉心浩智能科技有限公司 | 5G dielectric filter assembly line tool clamp and method |
| CN211840759U (en) * | 2020-03-16 | 2020-11-03 | 洛阳航达新材料科技有限公司 | Welding tool for titanium electrode plate conducting rod |
| CN212191884U (en) * | 2020-04-29 | 2020-12-22 | 深圳市威线科电子有限公司 | Branching device |
| CN213794934U (en) * | 2020-10-27 | 2021-07-27 | 广州世晨通信技术有限公司 | Special frock clamp of antenna element welding |
| CN214392733U (en) * | 2020-12-23 | 2021-10-15 | 杭州华扬电子有限公司 | An LCD screen hand welding aid |
| CN216421367U (en) * | 2021-12-21 | 2022-05-03 | 湖北特林节能设备有限公司 | Automatic soldering tool bracket for PCB (printed circuit board) |
Non-Patent Citations (1)
| Title |
|---|
| 潘辛丽;: "液晶模组FPC标准设计", 现代信息科技, no. 05, 25 November 2017 (2017-11-25) * |
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