CN204408844U - The electromagnetic screen of light-emitting device - Google Patents
The electromagnetic screen of light-emitting device Download PDFInfo
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- CN204408844U CN204408844U CN201520157607.0U CN201520157607U CN204408844U CN 204408844 U CN204408844 U CN 204408844U CN 201520157607 U CN201520157607 U CN 201520157607U CN 204408844 U CN204408844 U CN 204408844U
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Abstract
The utility model discloses a kind of electromagnetic screen of light-emitting device, comprise metal shell, connector, transparency electromagnetic wave shield film and power-supply filter, metal shell ground connection, the sidewall of metal shell is provided with multiple circular hole passed through for cable, metal shell is provided with the transparent optical window passed for light, transparency electromagnetic wave shield film covers on optical window medial surface, and transparency electromagnetic wave shield film is connected with metal shell by Copper Foil, connector arranges in metal shell, cable is connected with light-emitting device through connector, the metallic object of connector respectively with screen and the metal shell close contact of cable, power-supply filter is arranged on the power line entrance of light-emitting device.The utility model adopts metal shell to realize electromagnetic shielding, makes electromagnetic interference wave import the earth, filtering interfering; Power line and holding wire adopt the form of multiple twin simultaneously, with low cost, suppress interference effect good, make two lines in adjacent loop come and go current electromagnetic induction effect and cancel each other, do not affect the transmission of signal.
Description
Technical field
The utility model relates to a kind of electromagnetic shielding equipment, particularly relates to a kind of electromagnetic screen of light-emitting device.
Background technology
According to GJB151A-97 " military equipment and subsystem electromagnetic emission and susceptibility require ", above-mentioned requirements should be met to the electromagnetic emission and sensitivity characteristic that control military electronic, electric, dynamo-electric lamp apparatus and subsystem, the method that the test of equipment and subsystem electromagnetic emission and susceptibility should specify by GJB GJB152A is carried out, Electro Magnetic Compatibility and reliability play critical effect in the life cycle of electronic product, are especially embodied in military boats and ships.Once subsystem electronic devices and components exist electromagnetic interference and radiation, or be subject to the electromagnetic interference of other subsystems, so this system probably cisco unity malfunction, this will cause serious accident, therefore will pay attention to especially electronic equipment electromagnetic compatibility technology.The excessive problem of the Electro Magnetic Compatibility index of equipment caused military project and the great attention of the military, the report of qualified testing of equipment must be submitted to when equipment is paid.From engineering practice, a lot of is all after equipment de-sign completes, there is excessive problem in discovery, in this case be very scabrous, and cost is huge, as CE101, RE102 etc., be no matter the last measures to rectify and reform of telecommunication or structure be remedial, most of screening arrangement did not consider or considered comprehensively that can each index of Electro Magnetic Compatibility meet the demands present stage.
Utility model content
The purpose of this utility model is just the electromagnetic screen providing a kind of light-emitting device in order to solve the problem.
The utility model is achieved through the following technical solutions above-mentioned purpose:
A kind of electromagnetic screen of light-emitting device, comprise metal shell, connector, transparency electromagnetic wave shield film and power-supply filter, described metal shell ground connection, the sidewall of described metal shell is provided with multiple circular hole passed through for cable, described metal shell is provided with the transparent optical window passed for light, described transparency electromagnetic wave shield film covers on described optical window medial surface, and described transparency electromagnetic wave shield film is connected with described metal shell by Copper Foil, described connector arranges in described metal shell, described cable is connected with described light-emitting device through described connector, the metallic object of described connector respectively with screen and the described metal shell close contact of described cable, described power-supply filter is arranged on the power line entrance of described light-emitting device.
The ability of the reflection that metal shell has and electromagnetic wave absorption, the necessary condition of shielding makes shield good earth, object is that electromagnetic interference is introduced the earth, by covering layer of transparent electromagnetic wave shield film at optical window medial surface and with copper-foil conducting electricity, shielded film fully being contacted with metal shell, filtering electromagnetic interference.
Particularly, gauze screen is provided with in the gap of described circular hole and described cable.
Open circular hole during perforate as far as possible, and adopt multiple aperture to replace the method for macropore, if when hole seam size is greater than electromagnetic wavelength, take gauze screen or waveguide material shielding perforate.
Particularly, described cable adopts twisted-pair cable.
In electric wiring, twisted-pair feeder a kind ofly suppresses the wire that interference effect is good, with low cost, and its principle is that two lines come and go current electromagnetic induction effect and cancel each other in adjacent loop, and do not affect signal transmission, it suppresses crosstalk effect relevant with lay.Power supply output line and holding wire are advocated and uses twisted-pair feeder, and require closely hinge joint, output clutter can be made obviously to decline.
Particularly, the screen of described cable is 360 ° with the metallic object of described connector and contacts.
The 360 ° of contacts interface of cable shield and connector can be avoided to become approach that interference signal passes in and out system.
Particularly, the input lead of described power-supply filter is separated with output lead, and its shell is connected with described metal shell.
Power-supply filter generally adopts secondary filter form, belongs to low pass filter, can suppress the High-frequency Interference in power line.Filter is made up of the original paper such as inductance, electric capacity usually, and its effect is two-way, and not only can organize the interference access arrangement in electrical network, the interference that also can prevent equipment from producing enters electrical network.
The beneficial effects of the utility model are:
The electromagnetic screen of the utility model light-emitting device adopts metal shell and transparency electromagnetic wave shield film to realize electromagnetic shielding, is fully contacted by shielded film with copper-foil conducting electricity with metal shell, makes electromagnetic interference wave import the earth, filtering interfering; Power line and holding wire adopt the form of multiple twin simultaneously, with low cost, suppress interference effect good, make two lines in adjacent loop come and go current electromagnetic induction effect and cancel each other, do not affect the transmission of signal.
Accompanying drawing explanation
Fig. 1 is the perspective view of the electromagnetic screen of light-emitting device described in the utility model, there is shown its internal structure;
Fig. 2 is the cutaway view of the electromagnetic screen of light-emitting device described in the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As depicted in figs. 1 and 2, the electromagnetic screen of the utility model light-emitting device, comprise metal shell 1, connector 5, transparency electromagnetic wave shield film 6 and power-supply filter, metal shell 1 ground connection, the sidewall of metal shell 1 is provided with multiple circular hole 3 passed through for cable, gauze screen 8 is provided with in circular hole 3 and the gap of cable 9, metal shell 1 is provided with the transparent optical window 4 passed for light, transparency electromagnetic wave shield film 6 covers on optical window 4 medial surface, and transparency electromagnetic wave shield film 6 is connected with metal shell 1 by Copper Foil 7, connector 5 arranges in metal shell 1, cable 9 is connected with light-emitting device 2 through connector 5, the metallic object of connector 5 respectively with screen and metal shell 1 close contact of cable 9, screen and the metallic object of connector 5 of cable 9 are 360 ° and contact, power-supply filter is arranged on the power line entrance of light-emitting device 2, the input lead of power-supply filter is separated with output lead, and its shell is connected with metal shell 1, cable 9 adopts twisted-pair cable.
Light-emitting device 2 is arranged in metal shell 1, metal shell 1 has the ability of reflection and electromagnetic wave absorption, electromagnetic interference can be introduced the earth after metal shell 1 ground connection, cable 9 inserts metal shell 1 from the circular hole 3 metal shell 1 and is connected with light-emitting device 2 by after connector 5, and in equipment, electromagnetic shielding method is as follows:
1, adopt and attach a kind of method of transparency electromagnetic wave shield film 6 to prevent electromagnetic leakage at optical window 4 inwall, this shielded film transparency is 99%, do not affect the illumination of light-emitting device 2 completely, and with Copper Foil 7, transparency electromagnetic wave shield film 6 is fully contacted with metal shell 1, thus make electromagnetic interference wave import the earth;
2, adopt shielded type cable 9, the screen of cable 9 and the connector 5 of light-emitting device 2 must in the contacts of 360 °, and the metallic object of connector 5 is closely connected with screening housing, to realize good shielding;
3, adopt twisted-pair cable 9 as electrical equipment wiring, twisted-pair feeder a kind ofly suppresses the wire that interference effect is good, with low cost, power supply output line and holding wire advocated to using twisted-pair feeder, and require closely hinge joint, output clutter can be made obviously to decline;
4, install power-supply filter at the power import place of light-emitting device 2, and guarantee that input lead is separated with output lead, make it not only can organize interference access arrangement in electrical network, the interference that also can prevent equipment from producing enters electrical network.
The technical solution of the utility model is not limited to the restriction of above-mentioned specific embodiment, and every technology distortion made according to the technical solution of the utility model, all falls within protection range of the present utility model.
Claims (5)
1. the electromagnetic screen of a light-emitting device, it is characterized in that: comprise metal shell, connector, transparency electromagnetic wave shield film and power-supply filter, described metal shell ground connection, the sidewall of described metal shell is provided with multiple circular hole passed through for cable, described metal shell is provided with the transparent optical window passed for light, described transparency electromagnetic wave shield film covers on described optical window medial surface, and described transparency electromagnetic wave shield film is connected with described metal shell by Copper Foil, described connector arranges in described metal shell, described cable is connected with described light-emitting device through described connector, the metallic object of described connector respectively with screen and the described metal shell close contact of described cable, described power-supply filter is arranged on the power line entrance of described light-emitting device.
2. the electromagnetic screen of light-emitting device according to claim 1, is characterized in that: be provided with gauze screen in the gap of described circular hole and described cable.
3. the electromagnetic screen of light-emitting device according to claim 1, is characterized in that: described cable adopts twisted-pair cable.
4. the electromagnetic screen of light-emitting device according to claim 1, is characterized in that: screen and the metallic object of described connector of described cable are 360 ° and contact.
5. the electromagnetic screen of light-emitting device according to claim 1, is characterized in that: the input lead of described power-supply filter is separated with output lead, and its shell is connected with described metal shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520157607.0U CN204408844U (en) | 2015-03-19 | 2015-03-19 | The electromagnetic screen of light-emitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520157607.0U CN204408844U (en) | 2015-03-19 | 2015-03-19 | The electromagnetic screen of light-emitting device |
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| Publication Number | Publication Date |
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| CN204408844U true CN204408844U (en) | 2015-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520157607.0U Active CN204408844U (en) | 2015-03-19 | 2015-03-19 | The electromagnetic screen of light-emitting device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207766A (en) * | 2016-08-02 | 2016-12-07 | 四川睿联安电气有限公司 | A kind of power supply unit of anti-electromagnetic interference |
| CN108289403A (en) * | 2018-01-15 | 2018-07-17 | 中国科学院国家天文台 | A kind of high-precision laser range-finding equipment electromagnetic shielding cabin |
| CN108731764A (en) * | 2018-08-08 | 2018-11-02 | 合肥精都机电仪表有限公司 | A kind of flow integrator screening arrangement |
| CN109559654A (en) * | 2018-12-29 | 2019-04-02 | 深圳市奥拓电子股份有限公司 | LED display |
| CN109952014A (en) * | 2019-04-11 | 2019-06-28 | 北醒（北京）光子科技有限公司 | A kind of composite shield cover |
| CN114265485A (en) * | 2022-01-25 | 2022-04-01 | 苏州浪潮智能科技有限公司 | Hidden server handle |
-
2015
- 2015-03-19 CN CN201520157607.0U patent/CN204408844U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207766A (en) * | 2016-08-02 | 2016-12-07 | 四川睿联安电气有限公司 | A kind of power supply unit of anti-electromagnetic interference |
| CN108289403A (en) * | 2018-01-15 | 2018-07-17 | 中国科学院国家天文台 | A kind of high-precision laser range-finding equipment electromagnetic shielding cabin |
| CN108731764A (en) * | 2018-08-08 | 2018-11-02 | 合肥精都机电仪表有限公司 | A kind of flow integrator screening arrangement |
| CN109559654A (en) * | 2018-12-29 | 2019-04-02 | 深圳市奥拓电子股份有限公司 | LED display |
| CN109952014A (en) * | 2019-04-11 | 2019-06-28 | 北醒（北京）光子科技有限公司 | A kind of composite shield cover |
| CN114265485A (en) * | 2022-01-25 | 2022-04-01 | 苏州浪潮智能科技有限公司 | Hidden server handle |
| CN114265485B (en) * | 2022-01-25 | 2023-07-18 | 苏州浪潮智能科技有限公司 | Hidden server handle |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |