CN114390881A - Electromagnetic shielding method for space camera focal plane flexible circuit board - Google Patents
Electromagnetic shielding method for space camera focal plane flexible circuit board Download PDFInfo
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- CN114390881A CN114390881A CN202111614945.9A CN202111614945A CN114390881A CN 114390881 A CN114390881 A CN 114390881A CN 202111614945 A CN202111614945 A CN 202111614945A CN 114390881 A CN114390881 A CN 114390881A
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- circuit board
- flexible circuit
- electromagnetic shielding
- focal plane
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000004744 fabric Substances 0.000 claims description 48
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 39
- 239000011889 copper foil Substances 0.000 claims description 39
- 229920002379 silicone rubber Polymers 0.000 claims description 34
- 239000002390 adhesive tape Substances 0.000 claims description 24
- 239000004945 silicone rubber Substances 0.000 claims description 15
- 238000009413 insulation Methods 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 12
- 238000012545 processing Methods 0.000 description 12
- 238000005520 cutting process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 210000001503 joint Anatomy 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
- 239000004447 silicone coating Substances 0.000 description 1
- 239000010421 standard material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- 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
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
-
- 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
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
-
- 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
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/002—Casings with localised screening
- H05K9/0022—Casings with localised screening of components mounted on printed circuit boards [PCB]
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses an electromagnetic shielding method for a focal plane flexible circuit board of a space camera, and provides an electromagnetic shielding implementation method for the focal plane flexible circuit board.
Description
Technical Field
The invention belongs to the technical field of space remote sensors, and particularly relates to an electromagnetic shielding implementation method of a flexible circuit board for connecting a front-end time sequence circuit and a rear-end driving circuit of a space camera focal plane.
Background
The space camera focal plane imaging circuit is the core part of the camera and mainly comprises a photoelectric detector, a time sequence circuit and a video processing circuit. The photoelectric detector and the time sequence circuit form the front end of the focal plane circuit, and the front end circuit is connected to the focal plane main structure. The video processing circuit is a focal plane back end circuit, typically an independent electronic structure, connected to the main body of the optical engine or the satellite platform. Because the space camera focal plane has compact structure and small operable space, and relates to various electric and heat interfaces of an optical machine, the space camera at present mostly adopts a flexible circuit board to connect the front end and the rear end circuit of the focal plane so as to achieve the purposes of efficient transmission, space saving and flexible installation. However, the application of the flexible circuit board also introduces electromagnetic interference to the focal plane imaging circuit, so that appropriate measures are taken on the focal plane, the electromagnetic interference of the flexible circuit board is reduced on the premise of not influencing the transmission performance and the structural installation of the flexible circuit board, and the method has important significance for improving the imaging quality of the camera.
Disclosure of Invention
The invention aims to overcome the defects and provides an electromagnetic shielding method for a focal plane flexible circuit board of a space camera.
In order to achieve the above purpose, the invention provides the following technical scheme:
an electromagnetic shielding method for a space camera focal plane flexible circuit board comprises the following steps:
s1, adopting silicon rubber to insulate the connector welding points and the connector pins on the hardboards at the two ends of the flexible circuit board;
s2, after the edge of the electromagnetic shielding cloth is sealed, the flexible circuit board is wrapped by the electromagnetic shielding cloth and the overlapped part of the electromagnetic shielding cloth is bonded by the adhesive tape;
s3, the copper foil is used for coating the hardboards and the connector pins at the two ends of the flexible circuit board, the copper foil is used for covering the edge of the electromagnetic shielding cloth used for coating the flexible circuit board, and the silicon rubber is used for fixing the edge of the copper foil.
Further, in step S1, the insulation processing method is to coat the connector pads and the connector pins on the hard board with silicone rubber until the silicone rubber completely covers the connector pads and the connector pins on the hard board.
Further, in the step S1, the insulation treatment method includes coating the connector welding points and the connector pins on the hard board with silicone rubber, and coating again for 1-2 times after the silicone rubber is solidified.
Further, in step S2, an edge of the electromagnetic shielding cloth is sealed with an adhesive tape.
Further, in the step S2, the flexible circuit board is a straight strip structure, the length of the electromagnetic shielding cloth is equal to the length of the flexible circuit board, and the width of the electromagnetic shielding cloth is 2.2 to 2.8 times of the width of the flexible circuit board;
further, the width of the electromagnetic shielding cloth is 2.5 times of the width of the flexible circuit board.
Further, in step S2, when the adhesive tape is used to bond the overlapped portion of the electromagnetic shielding cloth, silicone rubber is used to perform dispensing at intervals on the edge of the adhesive tape, so as to reinforce the edge of the adhesive tape; the dispensing interval of the silicone rubber on the edge of the adhesive tape is 10-20 mm, and the dispensing height is less than or equal to 2 mm.
Further, in the step S3, the length of the copper foil is 2.2 to 2.8 times of the sum of the length and the lateral height of the hard board, and the width of the copper foil is the sum of the width and the lateral height of the hard board and is increased by 15 mm;
further, in step S3, the length of the copper foil is 2.5 times the sum of the length and the side height of the hard sheet.
Further, in the step S3, the copper foil covers 10-15mm of the edge of the electromagnetic shielding cloth used for wrapping the flexible circuit board.
Further, in the step S3, silicone rubber is used for dispensing at intervals of the edge to fix the edge of the copper foil; the glue dispensing interval of the silicon rubber at the edge of the copper foil is 10-20 mm, and the glue dispensing height is less than or equal to 2 mm.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention innovatively provides an electromagnetic shielding method for a focal plane flexible circuit board of a space camera, the focal plane flexible circuit board, hard plates at two ends and a connector are wrapped by electromagnetic shielding cloth and copper foil, insulation, edge sealing and reinforcement treatment are carried out by silicon rubber and adhesive tapes, the method can be directly implemented on the focal plane part of the camera, the operation is simple, implementation materials are low-cost and easily-obtained standard materials, the focal plane space is not occupied after implementation, the installation and the disassembly of the flexible circuit board are not influenced, the boundary part of the flexible plate and the hard plates is protected, and tests prove that the method has obvious electromagnetic shielding effect and can effectively improve the image quality;
(2) in the electromagnetic shielding method for the space camera focal plane flexible circuit board, the sizes of the electromagnetic shielding cloth and the copper foil and the silicon rubber dispensing technological parameters are designed, so that the reliability of electromagnetic shielding is further improved.
Drawings
FIG. 1 is a schematic diagram of a space camera focal plane flexible circuit board without electromagnetic shielding; wherein, (a) is a schematic diagram of the front side of the flexible circuit board before processing, (b) is a schematic diagram of the side surface of the flexible circuit board before processing, and (c) is a schematic diagram of the back side of the flexible circuit board before processing;
FIG. 2 is a flexible circuit board of the focal plane of the space camera processed by the electromagnetic shielding method of the present invention; the flexible circuit board processing method comprises the following steps of (a) processing a flexible circuit board, wherein the (a) is a schematic diagram of the front side of the processed flexible circuit board, (b) is a schematic diagram of the side face of the processed flexible circuit board, and (c) is a schematic diagram of the back side of the processed flexible circuit board;
fig. 3 is a schematic diagram of a focal plane flexible circuit board of a space camera without electromagnetic shielding in embodiment 1 of the present invention, where (a) is a schematic diagram of a front surface of the flexible circuit board before processing, (b) is a schematic diagram of a side surface of the flexible circuit board before processing, and (c) is a schematic diagram of a back surface of the flexible circuit board before processing;
fig. 4 is a schematic view of the flexible circuit board after the insulation treatment in embodiment 1 of the present invention, in which (a) is a schematic view of a front surface of the flexible circuit board after the insulation treatment, (b) is a schematic view of a side surface of the flexible circuit board after the insulation treatment, and (c) is a schematic view of a back surface of the flexible circuit board after the insulation treatment;
fig. 5 is a schematic view of a flexible circuit board after a flexible circuit board is wrapped with electromagnetic shielding cloth in embodiment 1 of the present invention, where (a) is a cut-to-size electromagnetic shielding cloth, (b) is a schematic view of a front surface of the flexible circuit board after the flexible circuit board is wrapped with the shielding cloth, (c) is a schematic view of a side surface of the flexible circuit board after the flexible circuit board is wrapped with the shielding cloth, and (d) is a schematic view of a back surface of the flexible circuit board after the flexible circuit board is wrapped with the shielding cloth;
fig. 6 is a schematic view of a flexible circuit board after being coated with a copper foil according to embodiment 1 of the present invention, where (a) is a cut-to-size of the copper foil, (b) is a schematic view of a front surface of the flexible circuit board after being coated with the copper foil, (c) is a schematic view of a side surface of the flexible circuit board after being coated with the copper foil, and (d) is a schematic view of a back surface of the flexible circuit board after being coated with the copper foil.
Detailed Description
The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The invention discloses an electromagnetic shielding implementation method of a space camera focal plane flexible circuit board, which is implemented mainly by four materials of electromagnetic shielding cloth, copper foil, adhesive tape and silicon rubber, wherein the focal plane flexible circuit board and connector connection hard boards at two ends are wrapped and shielded by the electromagnetic shielding cloth and the copper foil, and edge sealing, insulation and reinforcement are performed by the adhesive tape and the silicon rubber. Experiments prove that the implementation method provided by the patent has an obvious shielding effect and can effectively improve the image quality of the camera.
In the prior art, a flexible circuit board and a hard board are part of a focal plane circuit of a space camera. The space camera focal plane circuit mainly comprises a photoelectric detector, a sequential circuit and a video processing circuit, the space camera mostly adopts a flexible circuit board to connect the sequential circuit at the front end of the focal plane and the video processing circuit at the rear end, the flexible circuit board has high transmission efficiency and flexible structure, the focal plane space is saved, and the problem of serious electromagnetic interference also exists. The photoelectric detector and the time sequence circuit are connected on the focal plane optical-mechanical structure as a whole, and the focal plane optical-mechanical structure is called a front focal plane circuit. Due to the focal plane space constraints, the video processing circuitry is independent of the front-end circuitry and is connected to an interface outside the focal plane, referred to as the back-end circuitry. Referring to fig. 1, a flexible printed circuit board 1 is an intermediate portion connecting front and rear circuits of a focal plane, i.e., a flexible PCB. The flexible circuit board 1 is generally a strip-shaped flexible belt, the shape of the flexible belt can be flexibly adjusted according to the structural layout of the front and rear end circuits, the flexible circuit board is manufactured in a board manufacturing process, and the length of the flexible circuit board is generally less than 500 mm. Two ends of the flexible circuit board 1 are connected with the front end circuit and the rear end circuit through connectors, and the connectors are connected with the flexible board through the printed circuit board, namely the hard board 2. The length of the hard board 2 is basically consistent with the width of the flexible circuit board 1, and the width of the hard board 2 is customized according to the size of the connector. The hard board 2 is provided with connector welding spots, the connectors are welded on the hard board 2 and then are in butt joint with corresponding connectors on the front end circuit and the rear end circuit, and data transmission of the focal plane circuit is achieved.
The focal plane flexible circuit board electromagnetic shielding method comprises the following steps:
firstly, insulating treatment is carried out on the welding points and the inserting pins of the connector on the hard boards at the two ends of the flexible circuit board, the welding points and the inserting pins are coated with silicon rubber, the coating is carried out again after the glue is solidified, and the operation is carried out for a plurality of times until the welding points and the inserting pins of the connector are completely covered by the silicon rubber and no exposed metal part exists.
And after the hard board and the connector are subjected to insulation treatment, the flexible circuit board is wrapped and shielded by electromagnetic shielding cloth. Firstly, cutting the electromagnetic shielding cloth according to the shape and the size of the flexible circuit board to ensure that the flexible circuit board can be completely wrapped by the electromagnetic shielding cloth. Flexible circuit boards are generally in the shape of straight strips. The length of the cut shielding cloth is consistent with that of the flexible circuit board, and the width of the cut shielding cloth is about 2.2-2.8 times (preferably 2.5 times) of the width of the flexible circuit board. The edge of the electromagnetic shielding cloth after being cut is easy to generate conductive debris, and the conductive debris falls into a focal plane circuit and has short circuit hidden trouble. Therefore, the edge of the electromagnetic shielding cloth needs to be sealed by using an adhesive tape (preferably 3M adhesive tape) to ensure that no excess is left. After the electromagnetic shielding cloth is cut and sealed, the flexible circuit board is wrapped, the overlapped parts are bonded by using the adhesive tape, in order to prevent the edges of the adhesive tape from being opened, the silicon rubber is used for dispensing at intervals, and the edges of the adhesive tape are reinforced.
After the flexible circuit board is wrapped by the electromagnetic shielding cloth, the hard plates and the connectors at the two ends of the flexible circuit board are shielded by the copper foil. Firstly, the conductive copper foil is cut according to the sizes of the hard board and the connector, so that the copper foil can cover the hard board and the connector pins and can cover the edge of the electromagnetic shielding cloth on the flexible board. The length of the copper foil is 2.2-2.8 times (preferably 2.5 times) of the sum of the length and the side height (total height of the hard plate and the connector), and the width of the copper foil is the sum of the width and the side height of the hard plate and is increased by 15 mm. After the copper foil wraps the hard board, all edges are fixed at intervals by using silicon rubber. The copper foil not only plays an electromagnetic shielding role, but also plays a certain protection role in the junction position of the flexible board and the hard board, and prevents the bending damage during installation and disassembly. Fig. 2 shows a focal plane flexible circuit processed by the electromagnetic shielding method of the present invention, the flexible circuit board 1 is a straight strip, connectors are welded on the hard boards 2 at two ends, the flexible circuit board 1 is wrapped by electromagnetic shielding cloth 3 and bonded by adhesive tape 5, the hard boards 2 and the connectors are wrapped by copper foil 4, and silicone rubber 6 is used for dispensing and fixing.
Example 1:
the schematic diagram of the unprocessed flexible circuit board in this embodiment is shown in fig. 3.
Firstly, coating welding points and connector pins on a hard board with silicon rubber for multiple times until all metal parts are covered, finishing insulation treatment, avoiding contact short circuit after subsequent wrapping of electromagnetic shielding cloth or copper foil, and having the implementation effect shown in fig. 4.
And cutting the electromagnetic shielding cloth according to the shape of the flexible circuit board. The flexible circuit board in the embodiment has the length of 150mm and the width of 50 mm. Referring to fig. 5, an electromagnetic shielding cloth having a length of 150mm (equal to the length of the flexible board) and a width of 125mm (2.5 times the width of the flexible board: 50 × 2.5) is cut, and then the cut electromagnetic shielding cloth is deburred, and the edge of the electromagnetic shielding cloth is sealed by a 3M adhesive tape, thereby preventing generation of excess material. The flexible plate part is wrapped by electromagnetic shielding cloth, and the wrapped overlapped part is connected by 3M adhesive tape. And then, dispensing the silicon rubber along the 3M adhesive tape pasting edge at intervals, wherein the silicon rubber is dispensed once at intervals of about 10mm, and the dispensing height is controlled within 2 mm.
Cutting copper foil according to the size of the hard board and the connector, wherein the length of the hard board is 60mm, the width of the hard board is 12mm, the height of the connector and the hard board is 10mm, as shown in figure 6, cutting electromagnetic shielding cloth with the length of 175mm (2.5 times of the sum of the length and the height of the hard board, namely (60+10) × 2.5) and the width of 37mm (the sum of the width and the height of the hard board, and the balance of 15mm, namely 12+10+15), and removing burrs after cutting. And wrapping the hard board and the connector pins by using copper foil, and covering the edge of the electromagnetic shielding cloth by about 10-15 mm. And after the wrapping is finished, dispensing the silicon rubber at intervals along the edge of the copper foil, wherein the silicon rubber is dispensed at intervals of about 10mm, and the dispensing height is controlled within 2 mm.
Through EMC test verification, before and after electromagnetic shielding is implemented on a certain type of space camera focal plane flexible circuit board, in an electric field radiation emission test, the radiation electric field intensity is reduced to 25dBuV/m from 32dBuV/m, and the implementation method provided by the patent proves that the shielding effect is obvious, the radiation emission energy of a product can be effectively reduced, and the anti-interference capability of the product is improved.
The implementation method provided by the patent has an obvious shielding effect and can effectively improve the image quality of the camera.
The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention. The scope of the invention is defined by the appended claims.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (9)
1. An electromagnetic shielding method for a space camera focal plane flexible circuit board is characterized by comprising the following steps:
s1, adopting silicon rubber to insulate the connector welding points and the connector pins on the hardboards at the two ends of the flexible circuit board;
s2, after the edge of the electromagnetic shielding cloth is sealed, the flexible circuit board is wrapped by the electromagnetic shielding cloth and the overlapped part of the electromagnetic shielding cloth is bonded by the adhesive tape;
s3, the copper foil is used for coating the hardboards and the connector pins at the two ends of the flexible circuit board, the copper foil is used for covering the edge of the electromagnetic shielding cloth used for coating the flexible circuit board, and the silicon rubber is used for fixing the edge of the copper foil.
2. The space camera focal plane flexible circuit board electromagnetic shielding method of claim 1, wherein in step S1, the insulation treatment is performed by coating the connector pads and the connector pins on the hard board with silicone rubber until the silicone rubber completely covers the connector pads and the connector pins on the hard board.
3. The space camera focal plane flexible circuit board electromagnetic shielding method according to claim 2, wherein in the step S1, the insulation treatment method is to coat the connector pads and the connector pins on the hard board with silicone rubber, and coat again for 1-2 times after the silicone rubber is solidified.
4. The space camera focal plane flexible circuit board electromagnetic shielding method according to claim 1, wherein in step S2, an edge of the electromagnetic shielding cloth is sealed by using an adhesive tape.
5. The space camera focal plane flexible circuit board electromagnetic shielding method according to claim 1, wherein in the step S2, the flexible circuit board is a straight strip structure, the length of the electromagnetic shielding cloth is equal to the length of the flexible circuit board, and the width of the electromagnetic shielding cloth is 2.2-2.8 times the width of the flexible circuit board;
the width of the electromagnetic shielding cloth is 2.5 times of the width of the flexible circuit board.
6. The space camera focal plane flexible circuit board electromagnetic shielding method according to claim 1, wherein in step S2, when the overlapped part of the electromagnetic shielding cloth is bonded by using the adhesive tape, silicone rubber is used for dispensing at intervals on the edge of the adhesive tape to reinforce the edge of the adhesive tape; the dispensing interval of the silicone rubber on the edge of the adhesive tape is 10-20 mm, and the dispensing height is less than or equal to 2 mm.
7. The space camera focal plane flexible circuit board electromagnetic shielding method according to claim 1, wherein in step S3, the length of the copper foil is 2.2-2.8 times of the sum of the length of the hard board and the lateral height, and the width of the copper foil is the sum of the width of the hard board and the lateral height and is increased by a margin of 15 mm;
in step S3, the length of the copper foil is 2.5 times the sum of the length and the side height of the hard sheet.
8. The space camera focal plane flexible circuit board electromagnetic shielding method according to claim 1, wherein in the step S3, the copper foil covers 10-15mm of the edge of the electromagnetic shielding cloth used for wrapping the flexible circuit board.
9. The space camera focal plane flexible circuit board electromagnetic shielding method according to claim 1, wherein in step S3, silicone rubber is used for dispensing at intervals of the edge to fix the edge of the copper foil; the glue dispensing interval of the silicon rubber at the edge of the copper foil is 10-20 mm, and the glue dispensing height is less than or equal to 2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111614945.9A CN114390881A (en) | 2021-12-20 | 2021-12-20 | Electromagnetic shielding method for space camera focal plane flexible circuit board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111614945.9A CN114390881A (en) | 2021-12-20 | 2021-12-20 | Electromagnetic shielding method for space camera focal plane flexible circuit board |
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| CN114390881A true CN114390881A (en) | 2022-04-22 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060034455A (en) * | 2004-10-19 | 2006-04-24 | 삼성테크윈 주식회사 | Flexible printed circuit board, image sense module and camera module comprising the same |
| KR100907353B1 (en) * | 2008-07-18 | 2009-07-10 | 한화엘앤씨 주식회사 | Electromagnetic shielding film for flexible printed circuit board, shielded fpcb and method for manufacturing shielded fpcb |
| CN106061107A (en) * | 2016-08-08 | 2016-10-26 | 广州杰赛科技股份有限公司 | Rigidity and flexibility combination circuit board possessing electromagnetic shielding film and manufacturing method thereof |
| CN208434264U (en) * | 2018-08-14 | 2019-01-25 | 信利光电股份有限公司 | A kind of electromagnetic shielding display screen and display equipment |
| CN113498249A (en) * | 2020-04-07 | 2021-10-12 | 庆鼎精密电子（淮安）有限公司 | Rigid-flexible circuit board and preparation method thereof |
-
2021
- 2021-12-20 CN CN202111614945.9A patent/CN114390881A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060034455A (en) * | 2004-10-19 | 2006-04-24 | 삼성테크윈 주식회사 | Flexible printed circuit board, image sense module and camera module comprising the same |
| KR100907353B1 (en) * | 2008-07-18 | 2009-07-10 | 한화엘앤씨 주식회사 | Electromagnetic shielding film for flexible printed circuit board, shielded fpcb and method for manufacturing shielded fpcb |
| CN106061107A (en) * | 2016-08-08 | 2016-10-26 | 广州杰赛科技股份有限公司 | Rigidity and flexibility combination circuit board possessing electromagnetic shielding film and manufacturing method thereof |
| CN208434264U (en) * | 2018-08-14 | 2019-01-25 | 信利光电股份有限公司 | A kind of electromagnetic shielding display screen and display equipment |
| CN113498249A (en) * | 2020-04-07 | 2021-10-12 | 庆鼎精密电子（淮安）有限公司 | Rigid-flexible circuit board and preparation method thereof |
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