CN109462973B - Magnetic field shielding sheet and manufacturing method thereof - Google Patents
Magnetic field shielding sheet and manufacturing method thereof Download PDFInfo
- Publication number
- CN109462973B CN109462973B CN201810865785.7A CN201810865785A CN109462973B CN 109462973 B CN109462973 B CN 109462973B CN 201810865785 A CN201810865785 A CN 201810865785A CN 109462973 B CN109462973 B CN 109462973B
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- sheet
- magnetic field
- field shielding
- magnetic
- protective layer
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- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000011241 protective layer Substances 0.000 claims abstract description 50
- 239000012634 fragment Substances 0.000 claims abstract description 39
- 239000010410 layer Substances 0.000 claims abstract description 31
- 230000001681 protective effect Effects 0.000 claims abstract description 21
- 239000012790 adhesive layer Substances 0.000 claims description 23
- 239000012782 phase change material Substances 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 9
- 239000002131 composite material Substances 0.000 claims description 8
- 238000013467 fragmentation Methods 0.000 claims description 6
- 238000006062 fragmentation reaction Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000002390 adhesive tape Substances 0.000 claims description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 229920000052 poly(p-xylylene) Polymers 0.000 claims description 4
- 239000005060 rubber Substances 0.000 claims description 4
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 3
- 229910000889 permalloy Inorganic materials 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 239000002313 adhesive film Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 229910000808 amorphous metal alloy Inorganic materials 0.000 claims description 2
- 239000011127 biaxially oriented polypropylene Substances 0.000 claims description 2
- 229920006378 biaxially oriented polypropylene Polymers 0.000 claims description 2
- 230000001680 brushing effect Effects 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims description 2
- 238000005234 chemical deposition Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000005289 physical deposition Methods 0.000 claims description 2
- 238000010008 shearing Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims 1
- 238000007654 immersion Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- 229910052750 molybdenum Inorganic materials 0.000 claims 1
- 239000011733 molybdenum Substances 0.000 claims 1
- 238000007747 plating Methods 0.000 claims 1
- 238000005096 rolling process Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 238000005338 heat storage Methods 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 230000006698 induction Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention relates to a magnetic field shielding sheet, which comprises a thin magnetic sheet, a protective film and a first bonding layer, wherein the magnetic sheet is divided into a plurality of small fragments, gaps are formed between every two adjacent small fragments, the protective film is bonded on one surface of the magnetic sheet through the first bonding layer, the magnetic field shielding sheet also comprises a protective layer formed on the other surface of the magnetic sheet, the gaps of the magnetic sheet are at least partially filled by at least one of the first bonding layer and the protective layer, the small fragments are mutually insulated, the protective layer provides fixing and protecting functions for the small fragments, the small fragments are prevented from shifting, and the positioning effect of the small fragments is improved; the protective layer has a heat conduction function, is favorable for guiding out the heat of the coil, and reduces the heat of the coil in the use process; the protective layer has a heat storage function, helps to absorb heat of at least part of coils, reduces temperature rise, and improves the application function of the magnetic field shielding sheet.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a magnetic field shielding sheet and a manufacturing method thereof.
Background
The existing wireless charging device is realized by utilizing electromagnetic induction of a coil, in the process of electrifying the coil, the coil and a magnetic conduction material can generate heat, even induction heating is carried out on elements around the coil, the fatal influence is possibly caused, in order to solve the problems, the back of the coil is provided with shielding sheets of magnetic bodies such as amorphous strips, ferrite, polymer sheets containing magnetic powder and the like, a magnetic conduction or magnetism isolating function is provided, the shielding of magnetic flux brought by the coil is realized, and the shielding materials are high in required magnetic conductivity, high in saturation magnetic induction, low in eddy current loss and convenient to process into various shapes to be matched with the coil.
The prior art related to the present application can refer to a magnetic field shielding sheet for a wireless charger disclosed in chinese patent No. CN104011814B, which comprises a thin magnetic sheet, a protective film, a first adhesive layer and a double-sided tape, wherein the thin magnetic sheet is divided into a plurality of small fragments after being fragmented, the protective film is adhered to one surface of the magnetic sheet through the first adhesive layer, two sides of the double-sided tape are respectively provided with a second adhesive layer, the double-sided tape is adhered to the other surface of the magnetic sheet through the second adhesive layer, and gaps between the small fragments are filled by the first adhesive layer and the second adhesive layer, so that mutual insulation between the small fragments is promoted. Because the bonding layer is sticky and loose, small fragments are easy to shift, the positioning effect is poor, the heat conduction effect is poor, and the bonding material viscosity is reduced or even decomposed due to heat absorption of the bonding layer in the using process, so that the application function of the shielding sheet can be influenced.
Disclosure of Invention
The invention aims to provide a magnetic field shielding sheet with improved application function and a manufacturing method thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the utility model provides a magnetic field shielding piece, its includes sheet metal magnetic sheet, protection film and first tie coat, the magnetic sheet is cut apart into a plurality of tiny fragments, is formed the gap between each adjacent tiny fragment, the protection film bonds in the magnetic sheet one side through first tie coat, the magnetic field shielding piece still includes the protective layer that forms in the magnetic sheet another side, the gap of magnetic sheet is filled by at least one of first tie coat and protective layer at least part, promotes mutual insulation between the tiny fragments.
The invention also adopts the following technical scheme: a method of manufacturing a magnetic field shielding sheet, comprising the steps of:
Providing a thin magnetic sheet;
providing a protective film and a first bonding layer, wherein the first bonding layer bonds the protective film to one surface of the magnetic sheet;
Forming a protective layer on the other surface of the magnetic sheet; and
The magnetic sheet is divided into a plurality of small pieces with gaps therebetween by applying a flaking treatment, and the gaps are at least partially filled with at least one of the first adhesive layer and the protective layer to insulate the small pieces from each other.
The invention also adopts the following technical scheme: a method of manufacturing a magnetic field shielding sheet, comprising the steps of:
Providing a magnetic sheet, a protective film and a first bonding layer, wherein the first bonding layer bonds the protective film on one surface of the magnetic sheet;
the magnetic sheet is divided into a plurality of small fragments by applying fragmentation treatment, and gaps are arranged among the small fragments; and
And forming a protective layer on the other surface of the magnetic sheet, wherein the gap is at least partially filled by at least one of the first adhesive layer and the protective layer, so that small fragments are mutually insulated.
The magnetic field shielding sheet forms the protective layer on the other surface of the magnetic sheet, and the protective layer provides fixing and protecting functions for small fragments, prevents the small fragments from shifting and improves the positioning effect of the small fragments; the protective layer has a heat conduction function, so that the heat of the coil is led out, and the heat release of the coil is reduced; the protective layer has a heat storage function, helps to absorb heat of at least part of the coils, reduces temperature rise, and further improves the application function of the magnetic field shielding sheet.
Drawings
Fig. 1 is a schematic cross-sectional view of a magnetic field shielding sheet of the present invention.
Detailed Description
Referring to fig. 1, the present invention discloses a magnetic field shielding sheet 10 for a wireless charging product, which comprises a thin magnetic sheet 11, a protective film 12, a first adhesive layer 13, a protective layer 14 and a second adhesive layer 15.
The magnetic sheet 11 is formed of an amorphous alloy, a nanocrystalline alloy, a permalloy sheet, or ferrite, and is divided into a plurality of small pieces 111 after being subjected to a fragmentation treatment by at least one of transverse roller shearing or transverse roller pressing, the small pieces 111 may be the same or different in size and shape, and gaps 112 are formed between adjacent small pieces 111.
The protective film 12 is one of PET, PE, OPP, PVC, CPP or BOPP films. The protective film 12 is bonded to one surface of the magnetic sheet 11 via a first adhesive layer 13.
The protective layer 14 is formed on the other surface of the magnetic sheet 11, and the thickness is controlled to be between 0.1 nm and 1.0 mm, and the protective layer 14 is made of rubber, plastic, resin, silicon oxide (SIO 2), aluminum oxide (AL 2O 3), phase-change material, parylene film, a composite layer formed by combining phase-change material and resin according to a predetermined ratio, or the like. The protective layer 14 may be formed by spraying, brushing, dipping, casting, weather physical deposition, weather chemical deposition, vapor deposition, or the like.
When the back of the coil of a certain wireless charging device is not covered with the composite layer formed by combining the phase change material and the resin, the working frequency of the coil is 100K-150KHZ, and the inductance is 5-15uh, and the data obtained by temperature test are compared as follows:
| Uncovered composite layer | Covering composite layer | |
| Temperature measurement (DEG C) of inner point of incubator | 44.6 | 42.5 |
| Air temperature in incubator (DEG C) | 25.9 | 25.75 |
| Point temperature and air temperature difference (DEG C) | 18.7 | 16.75 |
Referring to the above table, it can be known that, after the composite layer is added, the temperature in the incubator, that is, the temperature of the periphery of the charging coil is reduced, so that the temperature of the shielding sheet 10 during the charging process of the coil can be reduced, and the temperature distribution is more uniform.
When the first adhesive layer 13 is adhered to the magnetic sheet 11 before the protective layer 14, if the gap 112 of the magnetic sheet 11 is not completely filled with the first adhesive layer 13, the protective layer 14 will be filled into the gap 112 to further fill the gap 112, otherwise, the protective layer 14 will not be filled into the gap 112.
Similarly, when the protective layer 14 is formed on the magnetic sheet 11 before the first adhesive layer 13, if the gap 112 of the magnetic sheet 11 is not completely filled with the protective layer 14, the first adhesive layer 13 fills the gap 112, further filling the gap 112, otherwise, the first adhesive layer 13 does not fill the gap 112.
Since the gaps 112 are at least partially filled with the first adhesive layer 13 or the protective layer 14, the small fragments 111 are insulated from each other.
The second adhesive layer 15 is a double-sided adhesive tape with a substrate, a double-sided adhesive tape without a substrate, or a hot-pressed double-sided adhesive film, the second adhesive layer 15 is adhered to the protective layer 14, and the protective layer 14 is interposed between the magnetic sheet 11 and the second adhesive layer 15.
The magnetic sheet 11 of the magnetic field shielding sheet 10 of the present invention has one side bonded with the protective film 12 through the first adhesive layer 13, and the other side formed with the protective layer 14, the protective layer 14 being interposed between the magnetic sheet 11 and the second adhesive layer 15, the protective layer 14 being filled or not filled into the gap 112 of the magnetic sheet 11, the protective layer 14 being additionally provided, and having the following advantages:
1. The protective layer 14 provides fixing and protecting functions for the small fragments 111, prevents the small fragments 111 from being displaced, and improves the positioning effect of the small fragments 111;
2. The protective layer 14 has a heat conduction function, is favorable for guiding out the heat of the coil, reduces the heat release of the coil, and improves the application function of the magnetic field shielding sheet;
3. The protective layer 14 has a heat storage function, helps to absorb heat of the coil, reduces temperature rise, and further improves the application function of the magnetic field shielding sheet.
The invention also discloses two manufacturing methods of the magnetic shielding sheet 10, wherein one manufacturing method of the magnetic shielding sheet 10 comprises the following steps:
Providing a thin magnetic sheet;
Providing a protective film and a first bonding layer, wherein the first bonding layer bonds the protective film to one surface of the magnetic sheet;
Forming a protective layer on the other surface of the magnetic sheet; and
And applying a fragmentation treatment, wherein the magnetic sheet is divided into a plurality of small fragments, gaps are formed among the small fragments, and at least one of the first bonding layer and the protective layer at least partially fills the gaps to insulate the small fragments from each other.
Another method for manufacturing the magnetic field shielding sheet 10 includes the steps of:
Providing a magnetic sheet, a protective film and a first bonding layer, wherein the first bonding layer bonds the protective film on one surface of the magnetic sheet;
the magnetic sheet is divided into a plurality of small fragments by applying fragmentation treatment, and gaps are arranged among the small fragments; and
And forming a protective layer on the other surface of the magnetic sheet, wherein at least one of the first bonding layer and the protective layer at least partially fills the gap so as to insulate the small fragments from each other.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Claims (11)
1. The utility model provides a magnetic field shielding piece, its includes sheet metal magnetic sheet, protection film and first tie coat, the magnetic sheet is cut apart into a plurality of tiny fragments, is formed with the gap between each adjacent tiny fragment, the protection film bonds in the magnetic sheet one side through first tie coat, its characterized in that: the magnetic field shielding sheet also comprises a protective layer formed on the other surface of the magnetic sheet, wherein a gap of the magnetic sheet is at least partially filled by at least one of the first bonding layer and the protective layer to promote mutual insulation between small fragments, and the protective layer adopts rubber, plastic, resin, silicon oxide, aluminum oxide, phase change material, a Parylene film or a composite layer formed by combining the phase change material and the resin according to a preset proportion.
2. The magnetic field shielding sheet according to claim 1, wherein: the magnetic field shielding sheet further includes a second adhesive layer bonded to the protective layer.
3. The magnetic field shielding sheet according to claim 2, wherein: the second bonding layer is a double-sided adhesive tape with a base material, a double-sided adhesive tape without a base material or a hot-pressed double-sided adhesive film.
4. The magnetic field shielding sheet according to claim 1, wherein: the thickness of the protective layer is 0.1 nm-1.0 mm.
5. The magnetic field shielding sheet according to claim 1, wherein: the protective layer is formed by adopting the technological modes of spraying, brushing, casting, immersion liquid, weather physical deposition, weather chemical deposition or vapor plating.
6. The magnetic field shielding sheet according to claim 1, wherein: the small pieces may be the same or different in size, shape.
7. The magnetic field shielding sheet according to claim 1, wherein: the magnetic sheet is formed of an amorphous alloy, a nanocrystalline alloy, a permalloy sheet, a molybdenum permalloy sheet, or ferrite.
8. The magnetic field shielding sheet according to claim 1, wherein: the magnetic sheet is fragmented by at least one of transverse roller shearing and transverse rolling, and then divided into a plurality of small fragments.
9. The magnetic field shielding sheet according to claim 1, wherein: the protective film is one of PET, PE, OPP, PVC, CPP or BOPP film.
10. A method of manufacturing a magnetic field shielding sheet, comprising the steps of: providing a thin magnetic sheet; providing a protective film and a first bonding layer, wherein the first bonding layer bonds the protective film to one surface of the magnetic sheet; forming a protective layer on the other surface of the magnetic sheet; and applying a fragmentation treatment, wherein the magnetic sheet is divided into a plurality of small fragments, gaps are formed among the small fragments, the gaps are at least partially filled by at least one of the first bonding layer and the protective layer, the small fragments are mutually insulated, and the protective layer adopts rubber, plastic, resin, silicon oxide, aluminum oxide, phase change material, a Parylene film or a composite layer formed by combining the phase change material and the resin according to a preset proportion.
11. A method of manufacturing a magnetic field shielding sheet, comprising the steps of: providing a magnetic sheet, a protective film and a first bonding layer, wherein the first bonding layer bonds the protective film on one surface of the magnetic sheet; the magnetic sheet is divided into a plurality of small fragments by applying fragmentation treatment, and gaps are arranged among the small fragments; and forming a protective layer on the other surface of the magnetic sheet, wherein the gap is at least partially filled by at least one of the first bonding layer and the protective layer, so that the small fragments are mutually insulated, and the protective layer adopts rubber, plastic, resin, silicon oxide, aluminum oxide, phase change material, parylene film or a composite layer formed by combining the phase change material and the resin according to a preset proportion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810865785.7A CN109462973B (en) | 2018-08-01 | 2018-08-01 | Magnetic field shielding sheet and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810865785.7A CN109462973B (en) | 2018-08-01 | 2018-08-01 | Magnetic field shielding sheet and manufacturing method thereof |
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| Publication Number | Publication Date |
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| CN109462973A CN109462973A (en) | 2019-03-12 |
| CN109462973B true CN109462973B (en) | 2024-05-17 |
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| CN201810865785.7A Active CN109462973B (en) | 2018-08-01 | 2018-08-01 | Magnetic field shielding sheet and manufacturing method thereof |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110048515B (en) * | 2019-05-23 | 2023-11-28 | 昆山联滔电子有限公司 | Wireless charging module and manufacturing process thereof |
| CN111431239A (en) * | 2020-04-20 | 2020-07-17 | 蓝沛光线（上海）电子科技有限公司 | Wireless charging module and preparation method thereof |
| CN113573563B (en) * | 2021-07-26 | 2022-09-06 | 横店集团东磁股份有限公司 | Composite magnetic shielding structure for wireless charging and manufacturing method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104011814A (en) * | 2011-12-21 | 2014-08-27 | 阿莫先恩电子电器有限公司 | Magnetic field shielding sheet for a wireless charger, method for manufacturing same, and receiving apparatus for a wireless charger using the sheet |
| CN104972709A (en) * | 2014-04-10 | 2015-10-14 | 苏州驭奇材料科技有限公司 | High-heat-dissipation wave-absorbing composite film and manufacturing method thereof |
| CN106170198A (en) * | 2015-05-22 | 2016-11-30 | 三星电机株式会社 | For shielding the sheet of electromagnetic wave |
| CN108235676A (en) * | 2018-03-13 | 2018-06-29 | 蓝沛光线（上海）电子科技有限公司 | A kind of preparation process and shielding piece of wireless charging application shielding piece |
| CN208768367U (en) * | 2018-08-01 | 2019-04-19 | 昆山联滔电子有限公司 | A kind of magnetic field shielding piece |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10673269B2 (en) * | 2015-07-20 | 2020-06-02 | Amosense Co., Ltd. | Magnetic field shielding unit |
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- 2018-08-01 CN CN201810865785.7A patent/CN109462973B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104011814A (en) * | 2011-12-21 | 2014-08-27 | 阿莫先恩电子电器有限公司 | Magnetic field shielding sheet for a wireless charger, method for manufacturing same, and receiving apparatus for a wireless charger using the sheet |
| CN104972709A (en) * | 2014-04-10 | 2015-10-14 | 苏州驭奇材料科技有限公司 | High-heat-dissipation wave-absorbing composite film and manufacturing method thereof |
| CN106170198A (en) * | 2015-05-22 | 2016-11-30 | 三星电机株式会社 | For shielding the sheet of electromagnetic wave |
| CN108235676A (en) * | 2018-03-13 | 2018-06-29 | 蓝沛光线（上海）电子科技有限公司 | A kind of preparation process and shielding piece of wireless charging application shielding piece |
| CN208768367U (en) * | 2018-08-01 | 2019-04-19 | 昆山联滔电子有限公司 | A kind of magnetic field shielding piece |
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