CN2476159Y

CN2476159Y - Shrapnel with electromagnetic interference high conduction efficiency

Info

Publication number: CN2476159Y
Application number: CN 01210333
Authority: CN
Inventors: 李琇足
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-01-22
Filing date: 2001-01-22
Publication date: 2002-02-06
Anticipated expiration: 2011-01-22

Abstract

The utility model provides a shrapnel with electromagnetic interference high conduction efficiency. The shrapnel comprises a shrapnel body, fixed parts and a compression part of the shrapnel body. The utility model is characterized in that: the shrapnel body comprises two fixed parts welded symmetrically between circuit plates or between a circuit plate and a shell, and a compression part connected with same directional free ends and different directional free ends of the two fixed parts. The shrapnel can emit the electromagnetic radiation produced by circuit plates from the external part. When compressed by the circuit plate, the shrapnel body does not produce any displacement or sliding, thereby preventing from contacting with other electronic parts and reducing the contact impedance.

Description

The shell fragment of tool electromagnetic interference high conduction efficient

The utility model relates to a kind of structure parts of electric equipment, particularly a kind of shell fragment.

At present, electromagnetic interference (EMI) is electronics circle existing one a big problem, because electromagnetic wave is a kind of existences and invisible microwave, all can causes the phase mutual interference for the electronic product in the human body or the external world, thereby cause serious consequences such as instrument is inaccurate, aircraft is out of control, automobile dashes cruelly; This shows that this electromagnetic wave is present in around us, form a kind of invisible killer.

Various countries pay attention to further to the requirement of the electromagnetic interference (EMI) of electronic product now, and the frequency of the integrated circuit on the circuit board (IC) is more and more high, execution speed is more and more fast, volume is also more and more little, therefore the design of shielding is also difficult further, this kind shielding in the past all is to electroplate with plastic cement to make, but can cause water to pollute, reach problems such as scrap can't reclaim, if with the metallic shield form, need consider problems such as processability and weight again, therefore change gold mining again and belong to the elastomer design, as Fig. 4, shown in 5, this spring plate 6 has two fixed parts 61,61 ', undertake an oblique shape compression unit 62 therebetween, 6 designs of this kind spring plate form nose heave body light structure, in the time of on being welded on circuit board, spring plate 6 can't be stood, and needs with anchor clamps clamping welding, thereby its speed of welding is slow, and also be difficult for being welded on the circuit board, when this circuit board 1 pressed down, the compression unit 62 of spring plate 6 can stretch out, thereby made spring plate 6 other end fixed parts 61 ' produce displacement or slip, so that contact and other electronics spare parts 3, and cause producing short circuit, and simultaneously, this displacement or sliding phenomenon, easily cause contact area too small, form contact impedance and increase and have influence on and derive electromagnetic function.

The purpose of this utility model is the shell fragment that a kind of tool electromagnetic interference high conduction efficient will be provided, it can effectively derive electromagnetic wave, can when spring plate is compressed, prevent the electronic component contact and reduce contact impedance, its welding procedure is good, and the spacing of suitable differing heights, restriction overcompression distortion, and have bigger incompressible amount.

Utility model is achieved in that spring plate comprises that two is symmetrical and be welded between circuit board and circuit board or the fixed part between circuit board and housing; One is undertaken on two fixed parts free end and not free-ended in the same way compression unit in the same way.

At least has the more than one tin portion that eats on two fixed parts; The area of two fixed parts can be but is not limited to isometric or wide; Two fixed parts respectively are not extended with a blocking part with the free end all accepted of compression, and compression unit can be but is not limited to that oblique shape plane is long-pending to have a more than one inflection point.

Spring plate of the present utility model, its volume is little, in light weight, and decapacitation is effectively derived outside the electromagnetic wave, and when spring plate was compressed, this spring plate can not produce the phenomenon of any displacement or slip, can prevent to contact with other electronics spare parts, also can reduce contact impedance; Two fixed parts of its spring plate are isometric and wait the width design, and during welding, also do not need with any special fixtures clamping welding; Its elastomer, applicable to the spacing of differing heights and need not to adjust originally as unified specification, guarantees that contact is good; On elastomeric two fixed parts, all has the tin of eating portion, can firmly be welded on circuit board or the housing, its two fixed part respectively is not extended with a blocking part with the free end that compression unit is accepted, but the overcompression of limit compression portion and cause the distortion, a plurality of inflection points on this spring plate have more bigger incompressible amount simultaneously.

The concrete structure of utility model is provided by following examples and accompanying drawing thereof.

Fig. 1 is that shell fragment axon of the present utility model is surveyed schematic diagram.

Fig. 2 is that spring plate of the present utility model uses the illustration intention.

Fig. 3 is that another embodiment axle of spring plate of the present utility model is surveyed schematic diagram.

Fig. 4 is traditional spring plate schematic diagram.

Fig. 5 is the pressing action schematic diagram of Fig. 4.

With reference to Fig. 1,2, the shell fragment of tool electromagnetic interference high conduction efficient mainly is to be configured between circuit board 1 and circuit board 1 ' or to be configured in circuit board 1 and 2 of housings, be provided with the electromagnetism wave amplitude that produces in the time of the electronics spare part on the circuit board 13 can being operated and penetrate the electromagnetic interference spring plate 4 of deriving the outside, spring plate 4 comprises two two symmetrical fixed parts 41,41 ', two fixed parts 41, on 41 ' two in the same way with two in the same way free ends 42 not, 42 ' locates to undertake a compression unit 43, compression unit 43 is made of more than one inflection point 44, use and form the elastic force that compression unit 43 has the compression buffering, at two fixed parts 41,41 ' the free end of not accepting with compression unit 43 45,45 ' locates respectively to be extended with a blocking

part

46,46 ', in order to prevent that compression unit 43 from too pressing down, at two fixed parts 41,41 ' is provided with and has the more than one tin portion 47 that eats at least, in order at two fixed parts 41,41 ' goes up tin and circuit board welding, and the other end is when contacting (or welding) with housing 3, this tin can enter to be eaten in the tin portion 47, spring plate 4 is able to firm welding (or being spirally connected) between circuit board 1 and circuit board 1 ' or 2 of circuit board 1 and housings, the width of cloth that electronics spare part 3 is produced can be penetrated to be directed on the housing by this to leave.

With reference to Fig. 2, when spring plate 4 in when welding, two fixed parts 41,41 ' can directly weld (being spirally connected) on two circuit boards 1,1 ' copper film 11,11 ', or be welded on the copper film 11 of circuit board 1, and another contacts (or welding) with housing 2, at this moment, electronics spare part 3 on the circuit board 1,1 ' is when running, the electromagnetism wave amplitude that the electronics spare part 3 on the circuit board 1,1 ' can be produced is penetrated to conduct on the housing 2 and is left, the electromagnetism wave amplitude that electronic component group 3 is produced is not penetrated and can be stuck in the housing 2, and influences the normal operation of electronics spare part 3; And applicable spacing at differing heights need not to adjust 4 of spring plates as unified a kind of specification, and guarantees that contact is good.

Because two fixed parts 41,41 ' of spring plate 4 are isometric and wait width to design, therefore the problem that does not have directivity, spring plate 4 itself can not rock when welding, is easy in SMT machinery rapid welding, and SMT machinery does not need with any special fixtures clamping welding when welding yet.

Because two fixed parts 41,41 ' surfacing, and two fixed parts 41,41 ' are equipped with the tin portion 47 that eats, and therefore when welding, two fixed parts 41,41 ' can firmly be welded on the circuit board 1, and the other end can contact (or welding) with housing 2.

The compression unit 43 of spring plate 4 does not structurally exceed two fixed parts 41,41 ' scope itself, at circuit board 1 or 1 ' during to lower compression, compression unit 43 makes two fixed parts 41,41 ' action vertically, therefore two fixed parts 41,41 ' can not produce any displacement or sliding phenomenon, preventing that two fixed parts 41,41 ' from contacting with the electronic component 3 of circuit board 1 or 1 ', and cause short circuit; Because two fixed parts 41,41 ' when compression, can not produce any displacement or sliding phenomenon (promptly being to change contact area), thereby make contact impedance reduce to minimum, and more firm.

Two fixed parts 41 of spring plate 4,41 ' and compression unit 43 places of accepting have a plurality of inflection points 44, and the decrement that this inflection point 44 can be born is big, makes spring plate 4 itself not yielding.Respectively be extended with blocking

part

46,46 ' on the free end that two fixed parts 41,41 ' are not accepted with compression unit 43, cause distortion but limit compression portion 43 too compresses, simultaneously, a plurality of inflection points 44 on the spring plate 4 have bigger incompressible amount.

With reference to Fig. 3, diagram spring plate 5 and above-mentioned spring plate 4 are in structure and use roughly the same, unique not existing together is the compression unit 52 that has an oblique shape plane configuration on the spring plate 5, and this compression unit 52 can not make two fixed parts 51,51 ' produce any displacement or sliding phenomenon when compression yet.

Claims

1, a kind of shell fragment with electromagnetic interference high conduction efficient, shell fragment is configured between circuit board and circuit board or is configured between circuit board and housing, it is characterized in that:

A. spring plate (4) comprises that two is symmetrical and be welded on fixed part (41,41 ') between circuit board (1) and circuit board (1 ') or circuit board (1) and housing (2);

B. one be undertaken on two fixed parts (41,41 ') free end (42,42 ') and the compression unit (43) of free end (45,45 ') in the same way or not.

2, shell fragment according to claim 1 is characterized in that having at least on two fixed parts (41,41 ') the more than one tin portion (47) that eats.

3, shell fragment according to claim 1, the area that it is characterized in that two fixed parts (41,41 ') can be but is not limited to isometric or wide.

4, shell fragment according to claim 1, it is characterized in that two fixed parts (41,41 ') not and the free end (45,45 ') accepted of compression unit (43) locate respectively to be extended with a blocking part (46,46 ').

5, shell fragment according to claim 1 is characterized in that compression unit (43) can be but is not limited to oblique shape plane and has a more than one inflection point (44).