CN108990406B - Ultrathin electromagnetic shielding sheet and electronic equipment using same - Google Patents
Ultrathin electromagnetic shielding sheet and electronic equipment using same Download PDFInfo
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- CN108990406B CN108990406B CN201811135597.5A CN201811135597A CN108990406B CN 108990406 B CN108990406 B CN 108990406B CN 201811135597 A CN201811135597 A CN 201811135597A CN 108990406 B CN108990406 B CN 108990406B
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- 239000010410 layer Substances 0.000 claims abstract description 116
- 239000012790 adhesive layer Substances 0.000 claims abstract description 112
- 239000012634 fragment Substances 0.000 claims abstract description 86
- 239000011241 protective layer Substances 0.000 claims abstract description 34
- 239000000853 adhesive Substances 0.000 claims abstract description 29
- 230000001070 adhesive effect Effects 0.000 claims abstract description 29
- 239000000758 substrate Substances 0.000 claims description 16
- 239000002390 adhesive tape Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 229910001004 magnetic alloy Inorganic materials 0.000 claims description 6
- 229910000889 permalloy Inorganic materials 0.000 claims description 6
- 239000006247 magnetic powder Substances 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 239000011733 molybdenum Substances 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 230000035699 permeability Effects 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000007767 bonding agent Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000005670 electromagnetic radiation Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 238000003698 laser cutting Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 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
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
Abstract
The application discloses an ultrathin electromagnetic shielding sheet and electronic equipment applying the same, wherein the ultrathin electromagnetic shielding sheet comprises a protective layer, a magnetic shielding layer, a double-sided adhesive layer and a release film layer, wherein the magnetic shielding layer is formed by discontinuously paving a first magnetic sheet fragment layer embedded in a first adhesive layer of the protective layer and a second magnetic sheet fragment layer discontinuously paved and embedded in a second adhesive layer of the double-sided adhesive layer in the direction of the protective layer; the first magnetic sheet fragments are filled with the adhesive in the first adhesive layer, and the second magnetic sheet fragments are filled with the adhesive in the second adhesive layer. The ultrathin electromagnetic shielding sheet disclosed by the application has no strict requirement on the integrity of the strip, and can realize the ultrathin electromagnetic shielding sheet under the condition of meeting electromagnetic shielding.
Description
Technical Field
The application relates to the technical field of electronic products, in particular to an ultrathin electromagnetic shielding sheet and electronic equipment using the same.
Background
With the development of economy and society, the variety of electronic products in our daily lives is increasing. Meanwhile, the electronic products are developed towards miniaturization, multifunction and intelligence, and key technologies such as high-frequency technology, digital technology and integration technology are generally adopted. The progress and the adoption of the technology greatly facilitate the life and the work of people, but bring negative effects: serious electromagnetic interference problems can occur between electronic devices, and excessive electromagnetic radiation can affect human health. Therefore, various electronic product factories can control the electromagnetic radiation quantity of products outwards, and meanwhile, the electromagnetic interference resistance of the products needs to be improved, so that electromagnetic shielding sheets need to be adopted.
In recent years, a rapidly developed wireless charging technology is required to achieve higher wireless charging efficiency and not to interfere with normal operation of electronic components in electronic products. In order to achieve the above object, an electromagnetic shielding sheet is also required to conduct an alternating magnetic field generated by a transmitting terminal of wireless charging, and to overcome a problem of heat generation due to an eddy current effect of itself.
Existing electromagnetic shielding sheet technology 1: disclosed is a composite magnetic body: is composed of soft magnetic metal phases and insulating phases between the soft magnetic metal phases. More specifically, the magnetic powder is formed by press-bonding a magnetic powder containing a flat soft magnetic metal powder and an insulating film formed on the surface of the metal powder.
Existing electromagnetic shielding sheet technology 2: disclosed is a magnetic field shielding sheet: at least one layer of thin magnetic sheet formed of an amorphous strip separated into a plurality of fine pieces, a protective film bonded to one surface of the thin magnetic sheet through a first adhesive layer, and a double-sided tape bonded to the other surface of the thin magnetic sheet through a second adhesive layer provided on one side surface; gaps between the plurality of fine pieces are filled with a part of the first adhesive layer and the second adhesive layer to insulate the plurality of fine pieces. More specifically, the above structure is formed by bonding (at least one layer of) the amorphous ribbon after the heat treatment with an adhesive tape, subjecting the amorphous ribbon to a chipping treatment, and further subjecting the amorphous ribbon to planarization and thinning.
Existing electromagnetic shielding sheet technology 3: disclosed is a single/multi-layered magnetically conductive sheet for wireless charging: a layer of magnetic sheet, wherein a plurality of cracks are uniformly distributed on the sheet, and the plurality of cracks divide the sheet into a plurality of fragment units; the gaps of the cracks are filled with insulating media so as to insulate the fragment units at two sides of the cracks from each other; and the double faced adhesive tape is adhered to one surface of the magnetic sheet, and a protective film formed by the insulating medium is formed on the other surface of the magnetic sheet. More specifically, the amorphous or nanocrystalline strip subjected to heat treatment is subjected to single-sided bonding, cracking, gum dipping treatment and drying solidification to form the structure.
Existing electromagnetic shielding sheet technology 4: disclosed is an electromagnetic shielding sheet for wireless charging: and the ferrite magnetic sheet, the graphite sheet and the coil are bonded on the laminated amorphous and nanocrystalline layers. More specifically, the amorphous and nanocrystalline strips after heat treatment are coated with glue on one side, subjected to patterning treatment (laser cutting or patterned etching), coated with glue again, and the like to form the structure.
In the prior art, the development requirements of high-frequency, digital, integrated and wireless chargeable electronic products can be met to a certain extent, but some problems remain unsolved, such as.
(1) The flat soft magnetic metal powder containing the insulating film is rolled in a stacked state, a part of the soft magnetic metal powder is deformed in a molding manner, and the other part of the soft magnetic metal powder is deformed in a breaking manner, so that the breaking surfaces are non-insulating, and the breaking surfaces are in contact with each other to form a large non-insulating area in the electromagnetic shielding sheet, and heat generation is serious due to eddy current in an alternating electromagnetic field.
(2) Performing mechanical crushing treatment on the single-sided or double-sided bonding of the amorphous/nanocrystalline strip subjected to heat treatment, wherein in a crushing stress concentration area, an area which cannot be covered by the amorphous/nanocrystalline strip exists in the thickness direction of the electromagnetic shielding sheet, so that electromagnetic leakage is caused, on one hand, the wireless charging efficiency is reduced, and on the other hand, the outside electromagnetic interference cannot be shielded; in addition, the amorphous/nanocrystalline strip is high in brittleness after heat treatment, the integrity requirement on the strip is high when single-sided or double-sided lamination is carried out, and the defective rate after lamination is high.
(3) The amorphous/nanocrystalline strip is subjected to laser cutting or patterned etching, and compared with mechanical crushing, the amorphous/nanocrystalline strip is high in energy consumption and large in pollution.
Disclosure of Invention
To the unresolved problem, an object of the present application is to provide an ultrathin electromagnetic shielding sheet, which has a good electromagnetic shielding effect, and does not generate magnetic leakage and eddy current heating phenomena.
The technical scheme adopted by the application is as follows.
An ultrathin electromagnetic shielding sheet comprises a protective layer, a magnetic shielding layer, a double-sided adhesive layer and a release film layer, wherein the protective layer is ultrathin substrate single-sided adhesive with a first bonding layer; the double-sided adhesive layer is a double-sided adhesive tape having a second adhesive layer and a third adhesive layer (i.e., the double-sided adhesive layer of the double-sided adhesive tape is convenient to be described later, the two layers are easily distinguished when the double-sided adhesive tape is a base material, and the two layers are actually integrated when the double-sided adhesive tape is a base material-free one).
The magnetic shielding layer is composed of a first magnetic sheet fragment layer discontinuously paved and embedded in a first bonding layer of the protection layer and a second magnetic sheet fragment layer discontinuously paved and embedded in a second bonding layer of the double-sided adhesive layer in the direction of the protection layer; the adhesive in the first adhesive layer is filled between the first magnetic sheet fragments, and the adhesive in the second adhesive layer is filled between the second magnetic sheet fragments; when the first magnetic sheet fragment layer and the second magnetic sheet fragment layer are laminated, the adhesive in the first adhesive layer is adhered to the non-mosaic surface of the second magnetic sheet fragment, the adhesive in the second adhesive layer is adhered to the non-mosaic surface of the first magnetic sheet fragment, and the first magnetic sheet fragment layer and the second magnetic sheet fragment layer jointly and completely cover the whole electromagnetic shielding sheet.
And the third bonding layer of the double-sided adhesive layer is adhered to the release film.
The first, second and third adhesive layers are all non-conductive adhesive layers.
As another preferable mode of the present technical scheme, an ultrathin electromagnetic shielding sheet further has a plurality of magnetic shielding layers and double-sided adhesive layers as described above, the first magnetic sheet fragments in the magnetic shielding layer not adjacent to the protective layer are discontinuously laid and inlaid in the third adhesive layer of the double-sided adhesive layer adjacent to the fragments, and the third adhesive layer of the outermost double-sided adhesive layer is adhered to the release film.
As a preferable scheme of the technical scheme, the distance L between any two points of the non-adjacent edges of the first magnetic sheet fragments and the second magnetic sheet fragments is as follows: l is more than or equal to 70 mu m and less than or equal to 3.3mm, and the size of fragments can be adjusted within the range according to the requirements of the target electromagnetic shielding sheet on the real part and the imaginary part of magnetic permeability.
As a preferable mode of the present technical solution, the minimum gap H between the first magnetic sheet segment and the second magnetic sheet segment is: the gaps between the first magnetic sheet fragments and the second magnetic sheet fragments are 70 μm or less and H or less and L or less, so that the adhesive in the first adhesive layer, the second adhesive layer and the third adhesive layer is well filled, and the effective adhesive area between the first adhesive layer, the second adhesive layer and the third adhesive layer and the adjacent magnetic sheet fragments is formed.
As a preferable scheme of the technical scheme, the first magnetic sheet fragments and the second magnetic sheet fragments are magnetic sheet fragments subjected to heat treatment, crushing and surface insulation treatment; the magnetic sheet is at least one of soft magnetic alloy, ferrite sheet and polymer sheet formed by magnetic powder/resin, and the thickness D of the magnetic sheet is as follows: d is less than or equal to 50 mu m.
Still further, the soft magnetic alloy is at least one of amorphous/nanocrystalline alloy sheet, permalloy sheet, and molybdenum permalloy sheet.
As the present technologyIn a preferred embodiment, the thickness T of the first adhesive layer in the protective layer 1 ：0.5D≤T 1 ≤D。
As a preferable scheme of the technical scheme, the double-sided adhesive layer is a double-sided adhesive layer with an ultrathin substrate, the thickness of the ultrathin substrate is less than 100 mu m, and the thickness T of the second adhesive layer 2 ：0.5D≤T 2 Thickness T of the third adhesive layer is less than or equal to D 3 ：0.5D≤T 3 ≤D。
As a preferable scheme of the technical scheme, the double-sided adhesive layer is a base material-free double-sided adhesive layer, and the total thickness T of the second adhesive layer and the third adhesive layer is as follows: d is more than or equal to T and less than or equal to 2D.
The adhesive layer is too thick, so that the thickness of the electromagnetic shielding sheet of the final finished product is too thick, and the aim of realizing lightness and thinness of various electronic products at present is not fulfilled; too thin a bonding layer may cause insufficient adhesive to fill the gaps between the magnetic sheet fragments, rendering the first and second magnetic sheet fragments unable to bond; the thickness range of the bonding layer disclosed by the application can ensure that the first magnetic sheet fragments and the second magnetic sheet fragments have better cohesiveness, and can realize the ultra-thin electromagnetic shielding sheet.
The application also discloses electronic equipment, which adopts the ultrathin electromagnetic shielding sheet.
Compared with the prior art, the technical scheme has at least the following advantages.
(1) The problem that the real part of the magnetic permeability of the compound is obviously reduced compared with the original magnetic substance after the magnetic substance is compounded with the non-magnetic organic substance is solved.
(2) The real part and the imaginary part of the magnetic permeability of the target electromagnetic shielding sheet can be adjusted by adjusting the size of the fragments of the magnetic sheet.
(3) Unlike the prior art concept of tape bonding reduction, the present application uses discontinuous spreading of the magnetic sheet scrap layer embedded in the adhesive layer, with no stringent requirements on tape integrity.
(4) Under the condition of meeting electromagnetic shielding, the ultra-thin electromagnetic shielding sheet can be realized.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present application.
Fig. 2 is a disassembled view of the structural schematic diagram of embodiment 1 of the present application.
Fig. 3 is a schematic structural diagram of embodiment 3 of the present application.
Fig. 4 is a schematic structural view of embodiment 5 of the present application.
Reference numerals: 1-a protective layer, 11-a first bonding layer in the protective layer, 110-a bonding agent in the first bonding layer, 2-a magnetic shielding layer, 21-a first magnetic sheet fragment layer, 22-a second magnetic sheet fragment layer, 3-a double-sided adhesive layer, 31-a second bonding layer in the double-sided adhesive layer, 310-a bonding agent filled in the second bonding layer between the magnetic sheet fragments, 32-a third bonding layer in the double-sided adhesive layer, 320-a bonding agent filled in the third bonding layer between the magnetic sheet fragments, 300-an ultrathin substrate of the double-sided adhesive layer, and 4-a release film layer.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The present application will be further specifically described with reference to the drawings and the specific embodiments, but the present application is not limited by the drawings and the embodiments.
Example 1.
As shown in fig. 1 and 2, an ultrathin electromagnetic shielding sheet comprises protective layers, release film layers, a single-group magnetic shielding layer and a double-sided adhesive layer, wherein the protective layers are arranged on the outermost layers of the two sides of the shielding sheet.
The protective layer is an ultrathin substrate single-sided adhesive with a first bonding layer, and the double-sided adhesive layer is a substrate-free double-sided adhesive with a second bonding layer and a third bonding layer.
The magnetic shielding layer is composed of a first magnetic sheet fragment layer and a second magnetic sheet fragment layer, wherein the first magnetic sheet fragment layer is discontinuously paved and embedded in a first bonding layer of the protective layer in the direction of the protective layer, and the second magnetic sheet fragment layer is discontinuously paved and embedded in a second bonding layer of the double-sided adhesive tape in the direction of the protective layer.
The adhesive in the first adhesive layer is filled between the first magnetic sheet fragments, and the adhesive in the second adhesive layer is filled between the second magnetic sheet fragments; when the first magnetic sheet fragment layer and the second magnetic sheet fragment layer are laminated, the adhesive in the first adhesive layer is adhered to the non-mosaic surface of the second magnetic sheet fragment, the adhesive in the second adhesive layer is adhered to the non-mosaic surface of the first magnetic sheet fragment, and the first magnetic sheet fragment layer and the second magnetic sheet fragment layer jointly and completely cover the whole electromagnetic shielding sheet.
The non-inlaid surface of the first adhesive layer is adhered to the protective layer, and the third adhesive layer of the double-sided adhesive layer is adhered to the release film.
The first adhesive layer, the second adhesive layer and the third adhesive layer are all non-conductive adhesive layers.
In order to realize the adjustment of the real part and the imaginary part of the magnetic permeability of the electromagnetic shielding sheet, in this embodiment, the distance L between any two points of the non-adjacent edges of the first magnetic sheet fragment and the second magnetic sheet fragment: l is more than or equal to 70 mu m and less than or equal to 3.3mm.
Further, for example, in order to obtain an ultrathin electromagnetic shielding sheet of different real and imaginary parts of permeability, a size value of a larger or smaller or intermediate region within the above range may be preferable.
Meanwhile, in order to ensure that the first and second magnetic sheet fragments have good adhesion, it is necessary to control the gap between the fragments, preferably, the minimum gap H between the first and second magnetic sheet fragments: h is more than or equal to 70 mu m and less than or equal to L, and the gap is selected according to the distance between any two points of the non-adjacent edges of the fragments.
The first magnetic sheet fragments and the second magnetic sheet fragments are the thicknesses D of the magnetic sheet fragments subjected to heat treatment, crushing and surface insulation treatment: d is less than or equal to 50 mu m.
The magnetic sheet is selected from at least one of soft magnetic alloy, ferrite sheet, and polymer sheet formed by magnetic powder/resin, and the soft magnetic alloy is selected from at least one of amorphous/nanocrystalline alloy sheet, permalloy sheet, molybdenum permalloy sheet, and other alloys with soft magnetic properties.
Thickness T of the first adhesive layer in the protective layer 1 ：0.5D≤T 1 And less than or equal to D, the total thickness T of the second bonding layer and the third bonding layer: d is more than or equal to T and less than or equal to 2D.
The ultrathin electromagnetic shielding sheet can be used for various electronic equipment with electromagnetic shielding requirements.
Example 2.
An ultrathin electromagnetic shielding sheet comprises protective layers on two outermost surfaces of the shielding sheet, a release film layer, a single-group magnetic shielding layer and a double-sided adhesive layer.
The protective layer is an ultrathin substrate single-sided adhesive with a first bonding layer, the double-sided adhesive layer is an ultrathin substrate double-sided adhesive with a second bonding layer and a third bonding layer, the thickness of the ultrathin substrate is less than 100 mu m, and the thickness T of the second bonding layer 2 ：0.5D≤T 2 Thickness T of the third adhesive layer is less than or equal to D 3 ：0.5D≤T 3 ≤D。
The remainder was similar to example 1.
Example 3.
As shown in FIG. 3, the ultrathin electromagnetic shielding sheet comprises a protective layer, a release film layer, two groups of magnetic shielding layers and a double-sided adhesive layer which are arranged on the outermost layers of the two sides of the shielding sheet.
A first set of magnetic shielding layer/double sided adhesive layer: the magnetic shielding layer is composed of a first magnetic sheet fragment layer and a second magnetic sheet fragment layer, wherein the first magnetic sheet fragment layer is discontinuously paved and embedded in a first bonding layer of the protective layer in the direction of the protective layer, and the second magnetic sheet fragment layer is discontinuously paved and embedded in a second bonding layer of the double-sided adhesive tape in the direction of the protective layer.
Second set of magnetic shielding layer/double sided adhesive layer: the magnetic shielding layer is composed of a first magnetic sheet fragment layer and a second magnetic sheet fragment layer, wherein the first magnetic sheet fragment layer is discontinuously paved and embedded in a third adhesive layer of the double-sided adhesive in the first group of magnetic shielding layers/double-sided adhesive layers in the direction of the protective layer, and the second magnetic sheet fragment layer is discontinuously paved and embedded in a second adhesive layer of the double-sided adhesive in the direction of the protective layer.
The non-inlaid surface of the first adhesive layer is adhered to the protective layer, the third adhesive layer of the double-sided adhesive layer in the second group of magnetic shielding layers/double-sided adhesive layers is adhered to the release film,
the remainder was similar to example 1.
Example 4.
An ultrathin electromagnetic shielding sheet comprises protective layers on two outermost surfaces of the shielding sheet, a release film layer, a plurality of groups of magnetic shielding layers and double-sided adhesive layers.
The first magnetic sheet fragment layer in the set of magnetic shielding layers/double-sided adhesive layers away from the protective film is discontinuously laid and inlaid in the third adhesive layer in the set of magnetic shielding layers/double-sided adhesive layers adjacent to the fragment.
The remainder was similar to example 3.
Example 5.
As shown in FIG. 4, an ultra-thin electromagnetic shielding sheet comprises a protective layer, a release film layer, two groups of magnetic shielding layers and a double-sided adhesive layer, wherein the ultra-thin substrate double-sided adhesive layer is adopted as a substrate-free double-sided adhesive layer on the basis of the embodiment 3, the thickness of the ultra-thin substrate is less than 100 μm, and the thickness T of the second adhesive layer is equal to or greater than that of the first adhesive layer 2 ：0.5D≤T 2 Thickness T of the third adhesive layer is less than or equal to D 3 ：0.5D≤T 3 ≤D。
Example 6.
An ultrathin electromagnetic shielding sheet comprises a protective layer, a release film layer, a plurality of groups of magnetic shielding layers and double-sided adhesive layers, wherein on the basis of the embodiment 4, an ultrathin substrate double-sided adhesive is adopted as a substrate-free double-sided adhesive layer, the thickness of the ultrathin substrate is less than 100 mu m, and the thickness T of a second adhesive layer is equal to or smaller than that of the substrate 2 ：0.5D≤T 2 Thickness T of the third adhesive layer is less than or equal to D 3 ：0.5D≤T 3 ≤D。
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the present invention, but the equivalent structures made by the description and drawings of the present invention, or the equivalent structures may be directly or indirectly applied to other related technical fields, which are all included in the scope of the present application.
Claims (9)
1. An ultra-thin electromagnetic shield piece, includes protective layer (1), magnetic shielding layer (2), double faced adhesive tape (3) to and from membranous layer (4), its characterized in that:
the protective layer is an ultrathin substrate single-sided adhesive with a first bonding layer (11);
the double-sided adhesive layer is double-sided adhesive with a second adhesive layer (31) and a third adhesive layer (32);
the magnetic shielding layer is composed of a first magnetic sheet fragment layer (21) discontinuously paved and embedded in a first bonding layer of the protection layer and a second magnetic sheet fragment layer (22) discontinuously paved and embedded in a second bonding layer of the double-sided adhesive layer in the direction of the protection layer; the first magnetic sheet fragments are filled with the adhesive (110) in the first adhesive layer, and the second magnetic sheet fragments are filled with the adhesive (310) in the second adhesive layer; when the first magnetic sheet fragment layer and the second magnetic sheet fragment layer are laminated, the adhesive in the first adhesive layer is adhered to the non-mosaic surface of the second magnetic sheet fragment, the adhesive in the second adhesive layer is adhered to the non-mosaic surface of the first magnetic sheet fragment, and the first magnetic sheet fragment layer and the second magnetic sheet fragment layer jointly and completely cover the whole electromagnetic shielding sheet;
the third bonding layer of the double-sided adhesive layer is adhered to the release film;
the first bonding layer, the second bonding layer and the third bonding layer are all non-conductive bonding layers;
the first magnetic sheet fragments and the second magnetic sheet fragments are magnetic sheet fragments subjected to heat treatment, crushing and surface insulation treatment, and the thickness D of the magnetic sheets is as follows: d is less than or equal to 50 mu m;
the distance L between any two points of non-adjacent edges of the first magnetic sheet fragments and the second magnetic sheet fragments is as follows: l is more than or equal to 70 mu m and less than or equal to 3.3mm.
2. An ultra-thin electromagnetic shield piece, includes protective layer and from type rete, its characterized in that: also provided with a plurality of magnetic shielding layers and double-sided adhesive layers as claimed in claim 1, wherein the first magnetic sheet fragments in the magnetic shielding layer which are not adjacent to the protective layer are discontinuously laid and inlaid in the third adhesive layer of the double-sided adhesive layer adjacent to the fragments, and the adhesive (320) in the third adhesive layer is filled between the fragments, and the third adhesive layer of the outermost double-sided adhesive layer is adhered to the release film.
3. The ultra-thin electromagnetic shielding sheet according to claim 1 or 2, characterized in that: minimum gap H between the first and second magnetic sheet fragments: h is more than or equal to 70 mu m and less than or equal to L.
4. The ultra-thin electromagnetic shielding sheet according to claim 1 or 2, characterized in that: the magnetic sheet is at least one of soft magnetic alloy, ferrite sheet and polymer sheet formed by magnetic powder/resin.
5. The ultra-thin electromagnetic shielding sheet according to claim 4, wherein: the soft magnetic alloy is at least one of an amorphous/nanocrystalline alloy sheet, a permalloy sheet and a molybdenum permalloy sheet.
6. The ultra-thin electromagnetic shielding sheet according to claim 1 or 2, characterized in that: thickness T of the first bonding layer in the protective layer 1 ：0.5D≤T 1 ≤D。
7. The ultra-thin electromagnetic shielding sheet according to claim 1 or 2, characterized in that: the double-sided adhesive layer is a double-sided adhesive with an ultrathin substrate (300), the thickness of the ultrathin substrate is less than 100 mu m, and the thickness T of the second adhesive layer 2 ：0.5D≤T 2 Thickness T of the third adhesive layer is less than or equal to D 3 ：0.5D≤T 3 ≤D。
8. The ultra-thin electromagnetic shielding sheet according to claim 1 or 2, characterized in that: the double-sided adhesive layer is a base material-free double-sided adhesive layer, and the total thickness T of the second adhesive layer and the third adhesive layer is as follows: d is more than or equal to T and less than or equal to 2D.
9. An electronic device, characterized in that: comprising an ultra-thin electromagnetic shielding sheet according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811135597.5A CN108990406B (en) | 2018-09-28 | 2018-09-28 | Ultrathin electromagnetic shielding sheet and electronic equipment using same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811135597.5A CN108990406B (en) | 2018-09-28 | 2018-09-28 | Ultrathin electromagnetic shielding sheet and electronic equipment using same |
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| Publication Number | Publication Date |
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| CN108990406A CN108990406A (en) | 2018-12-11 |
| CN108990406B true CN108990406B (en) | 2024-02-27 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109328011B (en) * | 2018-11-05 | 2019-10-11 | 苏州世诺新材料科技有限公司 | Ultra-thin electromagnetic shields piece and preparation method thereof |
| CN109859897B (en) * | 2019-01-04 | 2020-07-24 | 江苏科麦特科技发展有限公司 | Preparation method of discontinuous shielding belt |
| CN110113924B (en) * | 2019-05-05 | 2024-01-16 | 深圳市晶磁材料技术有限公司 | Electromagnetic shielding sheet and manufacturing method thereof |
| CN113993365A (en) * | 2021-10-28 | 2022-01-28 | 横店集团东磁股份有限公司 | Magnetic shielding structure for wireless charging and preparation method thereof |
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| 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 |
| KR20130090385A (en) * | 2012-02-03 | 2013-08-13 | 주식회사 아모센스 | Magnetic shielding sheet for digitizer, manufacturing method thereof, and portable terminal equipment using the same |
| CN105027355A (en) * | 2013-03-05 | 2015-11-04 | 阿莫先恩电子电器有限公司 | Composite sheet for shielding magnetic field and electromagnetic wave, and antenna module comprising same |
| KR20170038747A (en) * | 2015-09-30 | 2017-04-07 | 주식회사 아모센스 | Shielding unit for wireless power transfer, Wireless power transfer module comprising the same and Mobile device comprising the same |
| CN207589417U (en) * | 2017-12-19 | 2018-07-06 | 蓝沛光线（上海）电子科技有限公司 | A kind of antifreeze plate for being applied to wireless charging and NFC |
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