CN203085881U - Shielding cable - Google Patents
Shielding cable Download PDFInfo
- Publication number
- CN203085881U CN203085881U CN 201320023455 CN201320023455U CN203085881U CN 203085881 U CN203085881 U CN 203085881U CN 201320023455 CN201320023455 CN 201320023455 CN 201320023455 U CN201320023455 U CN 201320023455U CN 203085881 U CN203085881 U CN 203085881U
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- CN
- China
- Prior art keywords
- metal
- cable
- circle
- shielding layer
- shielding
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Insulated Conductors (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The utility model discloses a shielding cable which comprises a core wire. The core wire is covered with a grounded metal shielding layer. A circle at the interface of the metal shielding layer is in head joint with the surrounding of a connection part. According to the shielding cable provided by the utility model, a metal conductor is added outside the core wire of the cable; by using reflection and absorption carried out by metal on an electromagnetic wave and a skin effect principle (According to the skin effect, the distribution of current on a conductor cross section trends toward the conductor surface distribution with the rising of frequency; the higher the frequency is, the smaller the skin depth is; and the higher the frequency is, the weaker the penetration ability of the electromagnetic wave is.), external electromagnetic interference is effectively prevented from coming into the cable, and an internal signal is prevented from radiating out to interfere with the work of other devices; the circle at the interface of the metal shielding layer is in head joint with the surrounding of the connection part, which realizes electric connection of 360 degrees of the shielding layer; and the shielding layer fully covers the inner conductor, which ensures the integrity of electric field shielding.
Description
[technical field]
The utility model relates to the communication link wiring, relates in particular to a kind of shielded type cable.
[background technology]
Consider circuit characteristic and environmental condition except needs during cable design, also must consider the Electro Magnetic Compatibility requirement.Consider that from the Electro Magnetic Compatibility angle factor of selecting for use cable to consider is transmission signals waveform, frequency range, power level (electric current), circuit sensitive degree and electromagnetic environment.Equipment than the system of comparatively dense in the cloth cable, classification and minimum spacing require often to be difficult to take into account, and between the at this moment different cables interference and coupling are arranged easily, need at this moment to carry out the cable EMC Design targetedly.Generally, pair cable is better than common cable Electro Magnetic Compatibility, the single-layer shield cable is better than pair cable Electro Magnetic Compatibility, and the cable of shielding multiple twin is better than simple shielded type cable Electro Magnetic Compatibility, and the cable Electro Magnetic Compatibility of double layer screen, inner multiple twin is best.
But when present shielded type cable and connector connect, can not cover inner wire fully, can not guarantee the integrality of electric field shielding.
[utility model content]
The utility model provides a kind of shielded type cable, and screen can cover inner wire fully, guarantees the integrality of electric field shielding, and Electro Magnetic Compatibility is good.
The technical solution of the utility model is:
A kind of shielded type cable comprises heart yearn, covers the metal screen layer of a circle ground connection in heart yearn outside, a circle of this metal screen layer interface terminate at connecting portion around.
Shielded type cable of the present utility model covers the metal screen layer of a circle ground connection in the heart yearn outside, suppresses the external radiation of cable, simultaneously shielding attenuation is carried out in external interference; The balance principle of cancellation that is different from multiple twin, the utility model shielded type cable is to increase metallic conductor in the heart yearn outside of cable, (so-called skin effect is meant that electric current is tending towards conductive surface in the distribution of cross-sectional area of conductor with the rising of frequency and distributes to utilize the electromagnetic reflection of metal pair, absorption and skin effect principle, frequency is high more, skin depth is more little, be that frequency is high more, electromagnetic penetration capacity is weak more), can prevent effectively that external electromagnetic interference from entering cable, simultaneously also stop internal signal to radiate, disturb the work of miscellaneous equipment; And a circle of metal screen layer interface terminate at connecting portion around, realize the electrical connection of 360 ° of screens, screen has covered inner wire fully, has guaranteed the integrality of electric field shielding.
[description of drawings]
To be shielded type cable of the present utility model terminate at shape and structure figure on the connecting portion by cylindrical connector to Fig. 1.
[embodiment]
Below in conjunction with accompanying drawing specific embodiment of the utility model is done a detailed elaboration.
As Fig. 1, shielded type cable of the present utility model comprises heart yearn 1, covers the metal screen layer 2 of a circle ground connection in heart yearn 1 outside, a circle of this metal screen layer interface 3 terminate at connecting portion 4 around.
During concrete enforcement, a circle of described metal screen layer interface 3 can by DB or cylindrical connector terminate at connecting portion 4 around.Shown in Figure 1 is cylindrical connector, comprise the stiff end 5 that is fixed on the connecting portion 4, butt end 6 is passed shielded type cable and is docked on the stiff end 5, with interface 3 one the circle terminate at connecting portion 4 around, realize the electrical connection of 360 ° of screens, screen has covered inner wire fully, has guaranteed the integrality of electric field shielding.
In a preferred embodiment, described metal screen layer 2 comprises metal knitted net and aluminium foil layer, and metal knitted net covers heart yearn outside, and aluminium foil layer covers metal knitted net outside, one of metal knitted network interface place enclose terminate at connecting portion around.Promptly adopt the double layer screen mode, shield effectiveness is better.
The advantage of metal knitted net screen is its elasticity, durability, intensity and long aspects such as flex life.But typical metal knitted net coverage rate has only 60-98%, thereby lower than the shield effectiveness of solid conductor screen.Usually, use metal knitted net screen concerning electric field, shield effectiveness reduces less (except at uhf band), and concerning magnetic field, shield effectiveness then reduces a lot.Reason is that metal knitted net has destroyed the uniformity of electric current on the screen.Metal knitted net screen hangs down 5-30dB than solid conductor screen usually to the protection usefulness in magnetic field; this is because the space on the metal knitted net screen has caused metal knitted screen to cover floor height screening effectiveness decline frequently; along with the increase of frequency, metal knitted online hole is compared with wavelength and will be become more and more approaching.Therefore, the best metal knitted net count of shield effectiveness should have 95% coverage rate at least.
The practicality of aluminium foil layer shielded type cable is very strong, and it can provide almost 100% coverage rate, and more effective to the shielding of high-frequency electric field.But, it does not have metal knitted net so solid, and has higher screen cut-off frequency because screen resistance is big, is difficult to rightly and the connector termination yet.
So the shielded type cable preferred design becomes double layer screen, i.e. aluminium foil layer and metal establishment screen covers and combines, and the cable shield performance is best like this.Because screen has utilized paper tinsel screen layer and metal knitted screen to cover best separately characteristic, reduced their defective simultaneously to greatest extent.For double layer screen, noise current flows in outer shielding layer in addition, and signal code flows in internal shield, just can eliminate because the noise that screen resistance brings.And metal knitted network interface place one the circle can 360 ° of shieldings terminate on the connecting portion, aluminium foil layer can cover metal knitted online hole, and radioshielding is played good effect.
In a preferred embodiment, cover a circle insulating barrier in the metal screen layer outside.Can play a protective role to metal screen layer, and can play anti-interference effect.
Above-described the utility model execution mode does not constitute the qualification to the utility model protection range.Any modification of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the claim protection range of the present utility model.
Claims (4)
1. a shielded type cable comprises heart yearn, it is characterized in that: cover the metal screen layer of a circle ground connection in heart yearn outside, a circle of this metal screen layer interface terminate at connecting portion around.
2. shielded type cable according to claim 1 is characterized in that: described metal screen layer interface one the circle by cylindrical connector terminate at connecting portion around.
3. shielded type cable according to claim 1, it is characterized in that: described metal screen layer comprises metal knitted net and aluminium foil layer, metal knitted net covers heart yearn outside, and aluminium foil layer covers metal knitted net outside, one of metal knitted network interface place enclose terminate at connecting portion around.
4. according to claim 1 or 2 or 3 described shielded type cables, it is characterized in that: cover a circle insulating barrier in described metal screen layer outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320023455 CN203085881U (en) | 2013-01-17 | 2013-01-17 | Shielding cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320023455 CN203085881U (en) | 2013-01-17 | 2013-01-17 | Shielding cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203085881U true CN203085881U (en) | 2013-07-24 |
Family
ID=48831686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320023455 Expired - Fee Related CN203085881U (en) | 2013-01-17 | 2013-01-17 | Shielding cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203085881U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104979721A (en) * | 2014-04-02 | 2015-10-14 | 日立金属株式会社 | Wiring member |
| CN109301679A (en) * | 2018-10-17 | 2019-02-01 | 南京沃福曼医疗科技有限公司 | A method of reducing the control pair external radiation of OCT equipment moving |
| CN111725664A (en) * | 2019-03-22 | 2020-09-29 | 住友电装株式会社 | Electric wire with terminal |
-
2013
- 2013-01-17 CN CN 201320023455 patent/CN203085881U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104979721A (en) * | 2014-04-02 | 2015-10-14 | 日立金属株式会社 | Wiring member |
| CN104979721B (en) * | 2014-04-02 | 2018-01-05 | 日立金属株式会社 | Distribution component |
| CN109301679A (en) * | 2018-10-17 | 2019-02-01 | 南京沃福曼医疗科技有限公司 | A method of reducing the control pair external radiation of OCT equipment moving |
| CN111725664A (en) * | 2019-03-22 | 2020-09-29 | 住友电装株式会社 | Electric wire with terminal |
| CN111725664B (en) * | 2019-03-22 | 2021-10-29 | 住友电装株式会社 | Electric wire with terminal |
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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: 20130724 Termination date: 20170117 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |