CN203691857U - Electromagnetic field shielding can - Google Patents
Electromagnetic field shielding can Download PDFInfo
- Publication number
- CN203691857U CN203691857U CN201320864725.6U CN201320864725U CN203691857U CN 203691857 U CN203691857 U CN 203691857U CN 201320864725 U CN201320864725 U CN 201320864725U CN 203691857 U CN203691857 U CN 203691857U
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- unit cell
- screen
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- electromagnetic
- field
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Abstract
The utility model relates to an electromagnetic field shielding can, consisting of a substrate and a shielding layer adhered on the substrate; wherein the substrate is an adhesive tape or a shielding adhesive tape, the shielding layer is a sheet-shaped metal soft-magnetic layer, the magnetic permeability of the metal soft-magnetic layer is within the range from 5000 Hz to 150000 Hz; the metal soft-magnetic layer comprises a plurality of cells, the each cell is fit with adjacent edges of the adjacent cells thereof, a gap between the adjacent edges is from 0.001 [mu]m to 5 [mu]m, the area of the cell is within the range from 0.10 mm<2> to 2 mm<2>. The electromagnetic field shielding can of the utility model has the advantages that: the metal soft-magnetic layer shielding can according to the utility model can effectively reduce eddy current loss of high frequency electromagnetic waves after being divided according to a certain dimension, thereby achieving a better shielding effect in the section of high frequency band electromagnetic waves. At the same time, the electromagnetic field shielding can also has good controllability, and can further control the magnetic permeability of the metal soft-magnetic layer by adjusting the size of the cut cells.
Description
Technical field
The utility model relates to a kind of constitutional detail or shell of electric equipment, more specifically to the electromagnetic-field-shielded cover of one.
Background technology
A lot of electronic equipments are to utilize alternating magnetic field signal transmission and energy.The surrounding of this equipment there will be stronger magnetic field.These magnetic fields are harmful, produce induced current simultaneously, cause the misoperation of equipment.Therefore, on electronic equipment, need to use magnetic field shielding material.Thereby magnetic field makes shielding material, the inner induced current that produces loses magnetic energy and causes that the magnetic field intensity of shield weakens.Therefore, magnetic field shielding material generally adopts the metal soft magnetic material of high magnetic permeability and high saturated magnetic induction, and eliminating, low frequency electromagnetic field shield effectiveness is obvious.But because of the relatively low resistance and relative large eddy current losses of this material, more electromagnetic field of high frequency shield effectiveness is not obvious.
Utility model content
The purpose of this utility model is a kind of eddy current losses that can reduce frequency electromagnetic waves is provided for prior art weak point, has the electromagnetic-field-shielded cover at the better shield effectiveness of uhf electromagnetic wave section.
The purpose of this utility model is to realize by following measures: a kind of electromagnetic-field-shielded cover, it is characterized in that, and radome is made up of base material, the screen that is bonded on base material; Described base material is adhesive tape or shielding tape, screen is sheet metal soft magnetosphere, the magnetic permeability of soft magnetic metal layer is 5000Hz～150,000Hz, described soft magnetic metal layer includes some unit cells, the adjacent side that each unit cell is adjacent unit cell coincide mutually, and the gap between adjacent side is 0.001 ~ 5 micron, and the area of each unit cell is 0.10 square millimeter～2 square millimeters.
The some unit cells of described screen are unit cells of independently cutting apart.
The some unit cells of described screen comprise the unit cell that the unit cell independently cut apart is connected with adjacent side, and the ratio of the unit cell number that the unit cell number of independently cutting apart is connected with adjacent side is 4:1.
Fillet between the unit cell that described adjacent side is connected or on screen one side top layer or screen opposite side top layer or top layer, screen both sides all have, the thickness of fillet is lower than 1/10 of shielding thickness.
The left and right sides overlap joint of described sheet metal soft magnetosphere encloses mutually, and the cross section of enclosing is mutually tubular or rectangle.
Compared with prior art, the electromagnetic-field-shielded cover of one the utility model proposes, tool has the following advantages: after cutting apart by certain size according to the soft magnetic metal layer radome the utility model proposes, can effectively reduce the eddy current losses of frequency electromagnetic waves, thereby have better shield effectiveness at the electromagnetic section of high band.Meanwhile, also there is good controllability: by adjusting the size of cutter unit grid, can further control the magnetic permeability of soft magnetic metal material.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of an embodiment unit cell ordered arrangement the utility model proposes.
Fig. 2 is the connection diagram that the utility model proposes unit cell and adjacent side unit cell.
Fig. 3 is that the sheet metal soft magnetosphere left and right sides overlap joint the utility model proposes encloses mutually, the schematic diagram that the cross section of enclosing is mutually tubular.
Fig. 4 is the comparison diagram that the variation of frequency causes the variation of screen magnetic permeability.
Embodiment
Below in conjunction with accompanying drawing, embodiment is elaborated: shown in Fig. 1～Fig. 4, provided the different embodiment of the utility model.In figure, a kind of electromagnetic-field-shielded cover, radome is made up of base material 1, the screen 2 that is bonded on base material; Described base material 1 is adhesive tape or shielding tape, screen 2 is sheet metal soft magnetosphere, the magnetic permeability of soft magnetic metal layer is 5000Hz～150,000Hz, described soft magnetic metal layer includes some unit cells 3, the adjacent side that each unit cell is adjacent unit cell coincide mutually, and the gap between adjacent side is 0.001 ~ 5 micron, and the area of each unit cell is 0.10 square millimeter～2 square millimeters.Described unit cell can be ordered arrangement, as Fig. 1; Also can be lack of alignment, not draw.Be no matter in order or the unit cell of lack of alignment all want following condition: the size of area is all within 0.10 square millimeter～2 square millimeters, the adjacent side gap that each unit cell is adjacent unit cell is 0.001 ~ 5 micron, according to experiment effect, the effect that less unit cell more can obtain.Unit cell 3 on screen of the present utility model can be the unit cell independently cut apart, also can be the unit cell that the unit cell independently cut apart is connected with adjacent side, and the ratio of the unit cell number that the unit cell number of independently cutting apart is connected with adjacent side is 4:1.According to the utility model people's experiment effect, independently cut apart eddy current losses that more unit cells more can reduce frequency electromagnetic waves effectively, obtain better anti-shield effectiveness.Fillet 4 between the unit cell that adjacent side is connected or on screen one side top layer or screen opposite side top layer or top layer, screen both sides all have, the thickness of fillet 4 is lower than 1/10 of shielding thickness, and Fig. 2 shows fillet 4 in the screen one connected connection in side top layer.According to the utility model people's experiment effect, the thickness of fillet is more lower than 1/10 effect that more can obtain of shielding thickness.
The utility model is also further taked following measure:
The left and right sides overlap joint of described sheet metal soft magnetosphere encloses mutually, and the cross section of enclosing is mutually tubular or rectangle.Fig. 3 has provided the schematic diagram that cross section is tubular.Sheet metal soft magnetosphere of the present utility model can surround corresponding form according to the shape of conductively-closed thing.
The variation that the utility model has been drawn frequency through a large amount of result of the tests causes the curve chart 4 of the variation of screen magnetic permeability.In figure, abscissa is that frequency, ordinate are magnetic permeability.1,2,3 curves are the magnetic permeability change curve of other shielding material layers, and 4 is the utility model screen magnetic permeability change curve.Show that by result of the test superiority of the present utility model is self-evident.
Execution mode of the present utility model has been described above by reference to the accompanying drawings; the structure that embodiment provides does not form restriction of the present utility model, and in this area, those skilled in the art make within the scope of the appended claims various distortion or revise all in protection range.
Claims (5)
1. an electromagnetic-field-shielded cover, is characterized in that, radome is made up of base material, the screen that is bonded on base material; Described base material is adhesive tape or shielding tape, screen is sheet metal soft magnetosphere, the magnetic permeability of soft magnetic metal layer is 5000Hz～150,000Hz, described soft magnetic metal layer includes some unit cells, the adjacent side that each unit cell is adjacent unit cell coincide mutually, and the gap between adjacent side is 0.001 ~ 5 micron, and the area of each unit cell is 0.10 square millimeter～2 square millimeters.
2. electromagnetic-field-shielded cover according to claim 1, is characterized in that, the some unit cells of described screen are unit cells of independently cutting apart.
3. electromagnetic-field-shielded cover according to claim 1, it is characterized in that, the some unit cells of described screen comprise the unit cell that the unit cell independently cut apart is connected with adjacent side, and the ratio of the unit cell number that the unit cell number of independently cutting apart is connected with adjacent side is 4:1.
4. electromagnetic-field-shielded cover according to claim 3, it is characterized in that, fillet between the unit cell that described adjacent side is connected or on screen one side top layer or screen opposite side top layer or top layer, screen both sides all have, the thickness of fillet is lower than 1/10 of shielding thickness.
5. electromagnetic-field-shielded cover according to claim 1, is characterized in that, the left and right sides overlap joint of described sheet metal soft magnetosphere encloses mutually, and the cross section of enclosing is mutually tubular or rectangle column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320864725.6U CN203691857U (en) | 2013-12-25 | 2013-12-25 | Electromagnetic field shielding can |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320864725.6U CN203691857U (en) | 2013-12-25 | 2013-12-25 | Electromagnetic field shielding can |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203691857U true CN203691857U (en) | 2014-07-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320864725.6U Expired - Fee Related CN203691857U (en) | 2013-12-25 | 2013-12-25 | Electromagnetic field shielding can |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203691857U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761365A (en) * | 2018-04-11 | 2018-11-06 | 上海联影医疗科技有限公司 | Shielding case, the manufacturing method of shielding case, pet detector and system |
-
2013
- 2013-12-25 CN CN201320864725.6U patent/CN203691857U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761365A (en) * | 2018-04-11 | 2018-11-06 | 上海联影医疗科技有限公司 | Shielding case, the manufacturing method of shielding case, pet detector and system |
| US10914850B2 (en) | 2018-04-11 | 2021-02-09 | Shanghai United Imaging Healthcare Co., Ltd. | Housing for shielding a sensor from a radiofrequency field and an imaiging system including the same |
| US11353605B2 (en) | 2018-04-11 | 2022-06-07 | Shanghai United Imaging Healthcare Co., Ltd. | Housing for shielding a sensor from a radiofrequency field and an imaging system including the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140702 Termination date: 20181225 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |