CN2938728Y - Device for preventing electromagnetic interference - Google Patents
Device for preventing electromagnetic interference Download PDFInfo
- Publication number
- CN2938728Y CN2938728Y CN 200620062244 CN200620062244U CN2938728Y CN 2938728 Y CN2938728 Y CN 2938728Y CN 200620062244 CN200620062244 CN 200620062244 CN 200620062244 U CN200620062244 U CN 200620062244U CN 2938728 Y CN2938728 Y CN 2938728Y
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- Prior art keywords
- electromagnetic interference
- electronic devices
- portable electronic
- circuit board
- disposed
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Telephone Set Structure (AREA)
- Elimination Of Static Electricity (AREA)
Abstract
The utility model relates to an electromagnetic interference protection device, including a plurality of grounding welding pads arranged on a circuit board, a reed welded to the grounding welding pads, as well as conductive metal flakes. The conductive metal flakes such as aluminum foils are affixed to the back of the LCD panel or the shell of a portable electronic device and are contacted with the reed arranged on the circuit board to increase the grounded plane of the circuit board so as to decrease the area of the loop , which can reduce EMI problems in the electronic devices, and increase the electrostatic discharge preventing ability.
Description
Technical field
The utility model relates to a kind of electromagnetic interference shielding device, and particularly relevant for a kind of electromagnetic interference shielding device of portable electronic devices.
Background technology
Electromagnetic interference (Electromagnetic Interference, EMI) protection is very important safety index of electronic product, with the computer is example, microprocessor (CPU) is its inner maximum electromagnetic interference source, along with the arithmetic speed of microprocessor is more and more faster, the electromagnetic interference that it produced is also serious further.In addition, along with the volume of electronic installation is more and more little, wherein the wiring density of circuit board also can increase relatively, and the result then can cause the fragmentation of ground plane with not enough, therefore causes all to be difficult to meet the requirements on radiation test and electrostatic test.
General electronic installation is to the design of electromagnetic interference shielding, be as the main structure body with conductive material, and electromagnetic interference is closed in the inside of whole electronic installation, with the desktop PC is example, its casing adopts metal material mostly, and similarly is notebook computer or the less portable electronic devices of personal digital assistant equal-volume, then must use more frivolous plastic casing, and at conductive materials such as its shell inner face spraying conductive paints, with barrier as the electromagnetic interference of blockading.
Yet the employing aforesaid way not only can cause the problem in the environmental protection because of the spraying conductive paint, and since the cost height of conductive paint, the relative cost that also can improve the manufacturing portable electronic devices.
In addition; static discharge (Electrostatic Discharge; ESD) can be to integrated circuit (IntegratedCircuit; IC) semiconductor subassembly in produces serious destruction; it can't be worked; this is that this electric current can surpass the scope that semiconductor subassembly can be loaded usually, and portable electronic devices is caused damage because ESD can produce a large amount of electric currents in the extremely short time.
Generally speaking, the IC circuit is caused damage, can in the IC circuit chip, integrate the ESD protection circuit, it typically is a switching circuit in order to prevent ESD.When esd event took place, the ESD protection circuit can be switched on and high-tension ESD electric current is conducted to other place via other path, and can not make the ESD electric current enter IC circuit itself; And when general operation, the ESD circuit is a closed condition, can the running of IC circuit not impacted.
Yet, adopt aforesaid way must in the IC circuit, additionally set up switching circuit, all influential to the space and the manufacturing cost of IC circuit, and, also be difficult to the electrostatic discharge protective effect that reaches desirable because conductive area is limited.
Summary of the invention
In view of this, the purpose of this utility model is providing a kind of electromagnetic interference shielding device exactly, by the ground plane that increases the electronic device host plate, reduces loop area, and can reduce the problem of electromagnetic interference in the electronic installation, and increase the anti-system ability of static discharge.
For reaching above-mentioned or other purpose, the utility model proposes a kind of electromagnetic interference shielding device, the electromagnetic interference that it is produced when being suitable for protecting portable electronic devices running comprises at least one ground connection welding pad, at least one reed, and a conductive metal thin plate.Wherein, the ground connection welding pad is a plane that is disposed at a printed circuit board (PCB) of this portable electronic devices, and reed then is welded in these ground connection welding pads.In addition, conductive metal thin plate then is disposed at the one side of this portable electronic devices, is suitable for contacting those reeds on this printed circuit board (PCB), and increases a ground plane of this printed circuit board (PCB).
In the described electromagnetic interference shielding device of an embodiment of the present utility model, the plane of above-mentioned printed circuit board (PCB) is the ground plane of this printed circuit board (PCB).
In the described electromagnetic interference shielding device of an embodiment of the present utility model, the mode that wherein this conductive metal thin plate is disposed at this portable electronic devices comprises that the casing back of the body that is disposed at this portable electronic devices covers inner face, or is disposed at the back side of a display panels of this portable electronic devices.
In the described electromagnetic interference shielding device of an embodiment of the present utility model, above-mentioned conductive metal thin plate comprise aluminium foil and copper foil one of them.
In the described electromagnetic interference shielding device of an embodiment of the present utility model, above-mentioned ground connection welding pad is disposed at around the microprocessor of this portable electronic devices in the specific range, to reduce the loop area of this microprocessor.
In the described electromagnetic interference shielding device of an embodiment of the present utility model, above-mentioned portable electronic devices comprise mobile phone, personal digital assistant, guider, digital camera and walkman one of them.
The utility model sticks conductive metal thin plate because of adopting at the casing back of the body lid or the back side of display panels of portable electronic devices, and can by be disposed at motherboard on reed contact, radio frequency (RF) electric current via conductive metal thin plate ground connection, is reached the effect that reduces electromagnetic interference and increase the anti-system ability of static discharge.
For above-mentioned and other purpose, feature and advantage of the present utility model can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the electromagnetic interference shielding device that is illustrated according to the utility model preferred embodiment
Embodiment
In order to make content of the present utility model more clear, below the example that can implement according to this really as the utility model especially exemplified by embodiment.
Fig. 1 is the electromagnetic interference shielding device that is illustrated according to the utility model preferred embodiment.Please refer to Fig. 1, present embodiment is to stick one deck conductive metal thin plate by the display panels back side at portable electronic devices, and the reed on the contact print circuit board, and can increase the ground plane of printed circuit board (PCB), reaches the effect that reduces electromagnetic interference.Wherein, above-mentioned can portable electronic devices can be mobile phone, personal digital assistant, guider, digital camera or walkman, does not limit its scope.
The portable electronic devices 100 of present embodiment comprises a printed circuit board (PCB) 110, a casing 120 and a display panels 121.Wherein, printed circuit board (PCB) 110 more disposes microprocessor 113, and the wherein one side (front or reverse side) of printed circuit board (PCB) 110 then disposes 4 ground connection welding pads 111, and these ground connection welding pads 111 are connected to the ground plane in the printed circuit board (PCB) 110 respectively, and are welded with reed 112 respectively.
In addition, dispose display panels 121 on the casing 120 of portable electronic devices 100, then post conductive metal thin plate 122 at the back side of display panels 121.Wherein, conductive metal thin plate 122 can be the sheet metal of conductive material such as aluminium foil or Copper Foil, does not limit its scope.
When printed circuit board (PCB) 110 is installed on the casing 120,112 of reeds on it can contact conductive metal thin plate 122 respectively, whereby printed circuit board (PCB) 110 is connected with conductive metal thin plate 122, and increased the ground plane of printed circuit board (PCB) 110, also therefore can effectively reduce the problem of electromagnetic interference.In addition, because conductive metal thin plate 122 has increased the conductive area of portable electronic devices 100, also increased the anti-system ability of static discharge simultaneously.
Because microprocessor 113 is electromagnetic interference source maximum in the electronic installation, therefore, above-mentioned ground connection welding pad 111 is configurable in a specific range (for example 1 centimetre) around the microprocessor 113 of portable electronic devices 100, to reduce the loop area of microprocessor 113.
In the above-described embodiment, conductive metal thin plate 122 is display panels 121 back sides that are disposed at portable electronic devices 100, so do not limit its scope, the user is when visual actual needs, do not breaking away under the spirit of the present utility model, the casing back of the body that conductive metal thin plate 122 is disposed at portable electronic devices 100 covers inner face or other position.
In addition, the casing multipoint earthing is normally adopted in the design of high frequency product, and in the present embodiment, then be connected with conductive metal thin plate by ground plane with printed circuit board (PCB), thereby enlarge the conductive area of ground plane, and with radio frequency (RF) electric current through ground plane ground connection thus, therefore can lower the ground impedance on printed circuit board power plane and reduce loop area, the return current of all signals can be returned via ground level apace.
In sum, in electromagnetic interference shielding device of the present utility model, by sticking the sheet metal of conductive material such as aluminium foil at the casing of portable electronic devices or the back side of display panels, and contact to increase the ground plane of circuit board with reed on being disposed at circuit board, reduce loop area, and can reduce the problem of electromagnetic interference in the electronic installation, and increase the anti-system ability of static discharge.
Though the utility model discloses as above with preferred embodiment; right its is not in order to limit the utility model; anyly have the knack of this skill person; in not breaking away from spirit and scope of the present utility model; when doing a little change and retouching, therefore protection range of the present utility model is as the criterion when looking accompanying the claim person of defining.
Claims (7)
1. an electromagnetic interference shielding device is suitable for protecting the electromagnetic interference that is produced when a portable electronic devices operates, and it is characterized in that this device comprises:
At least one ground connection welding pad is disposed at a plane of a printed circuit board (PCB) of this portable electronic devices;
At least one reed is welded in those ground connection welding pads; And
One conductive metal thin plate is disposed at the one side of this portable electronic devices, is suitable for contacting those reeds on this printed circuit board (PCB), and increases a ground plane of this printed circuit board (PCB).
2. electromagnetic interference shielding device according to claim 1 is characterized in that, this plane of this printed circuit board (PCB) is this ground plane of this printed circuit board (PCB).
3. electromagnetic interference shielding device according to claim 1 is characterized in that, the mode that this conductive metal thin plate is disposed at this portable electronic devices comprises that the casing back of the body that is disposed at this portable electronic devices covers inner face.
4. electromagnetic interference shielding device according to claim 1 is characterized in that, the mode that this conductive metal thin plate is disposed at this portable electronic devices comprises the back side of a display panels that is disposed at this portable electronic devices.
5. electromagnetic interference shielding device according to claim 1 is characterized in that, this conductive metal thin plate comprise aluminium foil and copper foil one of them.
6. electromagnetic interference shielding device according to claim 1 is characterized in that, those ground connection welding pads are disposed at around the microprocessor of this portable electronic devices in the specific range, to reduce the loop area of this microprocessor.
7. electromagnetic interference shielding device according to claim 1 is characterized in that, this portable electronic devices comprise mobile phone, personal digital assistant, guider, digital camera and walkman one of them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620062244 CN2938728Y (en) | 2006-07-28 | 2006-07-28 | Device for preventing electromagnetic interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620062244 CN2938728Y (en) | 2006-07-28 | 2006-07-28 | Device for preventing electromagnetic interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2938728Y true CN2938728Y (en) | 2007-08-22 |
Family
ID=38362757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620062244 Expired - Fee Related CN2938728Y (en) | 2006-07-28 | 2006-07-28 | Device for preventing electromagnetic interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2938728Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923372A (en) * | 2009-06-12 | 2010-12-22 | 鸿富锦精密工业（深圳）有限公司 | Host |
| CN101646297B (en) * | 2008-08-05 | 2011-11-09 | 英业达股份有限公司 | Electronic device with electrostatic guide structure |
-
2006
- 2006-07-28 CN CN 200620062244 patent/CN2938728Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101646297B (en) * | 2008-08-05 | 2011-11-09 | 英业达股份有限公司 | Electronic device with electrostatic guide structure |
| CN101923372A (en) * | 2009-06-12 | 2010-12-22 | 鸿富锦精密工业（深圳）有限公司 | Host |
| CN101923372B (en) * | 2009-06-12 | 2013-10-09 | 鸿富锦精密工业（深圳）有限公司 | Host |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070822 Termination date: 20110728 |