CN102591495A - Low-radiation mouse - Google Patents
Low-radiation mouse Download PDFInfo
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- CN102591495A CN102591495A CN2012100404650A CN201210040465A CN102591495A CN 102591495 A CN102591495 A CN 102591495A CN 2012100404650 A CN2012100404650 A CN 2012100404650A CN 201210040465 A CN201210040465 A CN 201210040465A CN 102591495 A CN102591495 A CN 102591495A
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Abstract
The invention discloses a low-radiation mouse which comprises a printed circuit board, a circuit module shielding device and a cable. The printed circuit board is arranged in the circuit module shielding device; the circuit module shielding device is formed by a topmost stratum, a bottommost stratum and a shielding cover plate in a sealing way; the outer surface of the lead of the cable is wrapped by at least two shielding layers; and the at least two shielding layers comprise at least one copper mesh layer and at least one tinfoil layer. Due to the design, the circuit of the low-radiation mouse can be shielded all around. In addition, the characteristics of shielding electromagnetic waves in different regions of the tin and the copper are used, the advantages of the tin and the copper are retained, and the disadvantages are complemented, thus the low-radiation mouse has a new shielding effect.
Description
Technical field
The present invention relates to a kind of computer mouse, specifically, relate to a kind of low radiation mouse that is applied to low radiation computer system.
Background technology
Along with fast development of information technology, Information Technology Equipment has been widely used in the concerning security matters field.In the processing and transmission of classified information, Information Technology Equipment constantly has the electromagnetic wave of classified information to the outer radiation belt.Artificial employing is surreptitiously received reduction technique and can be intercepted and captured and restore classified information, causes the accident of divulging a secret of losing.Just there was the special televisor of transforming of human outside hundreds of rice, to reappear the information on the computer display screen as far back as 1985.The electromagnetic radiation of Information Technology Equipment is not only harmful, and serious threat is to information security.The leakage of information that suppresses Information Technology Equipment, development is low lets out that to penetrate Information Technology Equipment be the problem that the current information security fields press for solution.
The U.S. was just studied the mechanism of Information Technology Equipment electromagnetic information leakage since the sixties; Progressively formed the technology of unique inhibition Information Technology Equipment electromagnetic leakage; Issued relevant criterion; Develop multiple low radiation computing machine, beginning is a large amount of after the eighties produces, and supplies military's buying.
China just carries out inhibition Information Technology Equipment electromagnetic leakage Study on Technology from the eighties, and the nineties is developed practical Information Technology Equipment.But because technology and test condition limit, hang down to let out and penetrate Information Technology Equipment and also have many problems, fail to catch up with international most advanced level so far in outward appearance and aspect of performance.
The severe situation and the present situation that face in view of department such as office of current China Party, government and army, army, E-Government, ecommerce, finance and field; Improve the whole defence capability that information security is maintained secrecy, guarantee the information security of computing machine, break the active demand of external blockade on new techniques, it is very urgent that research and development have the high shielding properties equipment of independent intellectual property right.
China utility model application CN200520005877.6 discloses a kind of low radiation optical mouse; Control circuit board adopts four-sheet structure; Round floor integral body is covered copper for covering the copper shield stratum, and LC type filtering circuit is welded in and covers on the copper shield stratum, and closed square is formed by the rectangular area pad in control circuit board top layer face middle and lower part; Circular via hole is uniformly distributed on the rectangular area pad, shield shell and the welding of rectangular area pad.
Existing technology mainly is to be utilized in to add the purpose that shield shell independently reaches shielding on the mouse main circuit.Though the method can mask most of electromagnetic radiation, because mouse circuit and work thereof can not be accomplished to shield fully.Therefore, can not reach the requirement of military high-grade shielding mouse.
In addition, the screen layer of mouse cable adopts single metal level in the existing technology, because it is to electromagnetic physical characteristics, can not all accomplish effective shielding to wide frequency domain (10kHz is to 18GHz).
Summary of the invention
The technical matters that the present invention solved is to provide a kind of low radiation mouse, and having guaranteed all has the high-efficiency shielding performance to 10kHz to the electromagnetic wave in the frequency domain of 18GHz.
Technical scheme is following:
A kind of low radiation mouse; Comprise printed circuit board, circuit module shield assembly and mouse cable; Said printed circuit board is arranged in the said circuit module shield assembly, and said circuit module shield assembly is by the superiors stratum, and orlop stratum and shielding cover board sealing constitute; The lead outside surface of said mouse cable is enclosed with two-layer at least screen layer, and said two-layer at least screen layer comprises one deck copper mesh layers and one deck tinfoil layer at least at least.
Further: said screen layer comprises two-layer copper mesh layers and two-layer tinfoil layer.
Further: said two-layer copper mesh layers and two-layer tinfoil layer intermeshing cover, and lamination order from inside to outside is followed successively by tinfoil layer, copper mesh layers, tinfoil layer, copper mesh layers.
Further: the material of said shielding cover board is brass, aluminium, iron, gold or silver.
Further: the front end right part at said shielding cover board is provided with wire hole.
Further: said printed circuit board comprises at least one layer signal layer, one deck bus plane and multilayer stratum at least.
Further: said signals layer and the shared one deck of said bus plane, said stratum is three layers; Said printed circuit board lamination order from top to bottom is followed successively by said the superiors stratum, signal and bus plane, middle stratum and said orlop stratum.
Further: the material on said the superiors stratum and said orlop stratum is a tin.
Further: said printed circuit board is provided with ground hole and connecting hole, and wherein, said ground hole is a via, and said connecting hole is a blind hole.
Further: said low radiation mouse also comprises mouse case, button and roller; Wherein, Said button and said roller are inlaid on the upper surface of said mouse case; Said printed circuit board and said circuit module shield assembly are arranged on the said mouse case inner bottom surface, and said mouse cable is drawn through the wire hole that is arranged on the mouse case front end.
Technique effect of the present invention comprises:
1, the present invention has adopted multilayer printed circuit board, and is used in combination the shielding construction that increase circuit module shield assembly and mouse cable employing one deck shop tin layer and layer of copper stratum reticulare combine, and has reached the comprehensive shielding to mouse circuit.
2, the present invention utilizes shielding electromagnetic waves characteristic in these two kinds of different frequency domains of metal pair of tin and copper, is keeping it separately in the advantage, and complementary their weak point has been brought brand-new shield effectiveness.
Description of drawings
Fig. 1 is the assembly drawing of the low radiation mouse of the present invention;
Fig. 2 is the circuit theory diagrams of the low radiation mouse of the preferred embodiments of the present invention;
Fig. 3 is the synoptic diagram of circuit module shielding cover board of the present invention;
Fig. 4 is the diagrammatic cross-section of mouse cable of the present invention.
Embodiment
Below with reference to exemplary preferred embodiments and reference drawings, the present invention is described in detail.
As shown in Figure 1, be the assembly drawing of the low radiation mouse of the present invention.The structure of low radiation mouse comprises: mouse case 1, button 2, roller 3, mouse cable 4 and printed circuit board.Button 2 is inlaid on the upper surface of mouse case 1 with roller 3.Printed circuit board is arranged in the circuit module shield assembly.The circuit module shield assembly is made up of the superiors stratum 5, orlop stratum 8 and shielding cover board 9 sealings.Printed circuit board and circuit module shield assembly are arranged on mouse case 1 inner bottom surface.Mouse cable 4 is drawn through the wire hole that is arranged on mouse case 1 front end.
The layout of circuit board is meant the theory with electromagnetic compatibility with design, and comprehensive EMC Design experience is designed and both satisfied functional requirement, satisfies the circuit of electromagnetic compatibility requirement again.
As the part of the carrying and the easiest generation electromagnetic radiation of electron device, printed circuit board (pcb) occupies a very important position in the electromagnetic Compatibility Design of low radiation mouse.In electromagnetic compatibility (EMC) design of printed circuit board (pcb) is considered, at first be the design of layer.The number of plies of printed circuit board (pcb) is become with the signals layer array by the number of plies on power supply, ground, and the relative position of bus plane, stratum, signals layer and power supply, The Split Ground Plane are most important to the electromagnetic compatibility index of printed circuit board (pcb).
Want the rational number of plies of design planning; Need be according to kind, signal density, the plate level work frequency on the power supply of printed circuit board (pcb), ground, the number of signals of special cabling requirement is arranged; And comprehensively the performance index of printed circuit board (pcb) require and the cost ability to bear, just can confirm the number of plies of printed circuit board (pcb).Under the situation that meets the relevant criterion index request, suitably increase ground level, be one of the trump card of electromagnetic compatibility (EMC) design of printed circuit board (pcb).
For low radiation mouse, design the number of plies of its circuit board and at first should design overall circuit theory diagrams.As shown in Figure 2, be the circuit theory diagrams of the low radiation mouse of the preferred embodiments of the present invention.
Can be found out by Fig. 2: circuit board is supplied power by single power supply, and key chip--and the clock signal frequency of optical sensor chip (being the PAN3512 chip among Fig. 2) is 24MHz, and entire circuit has only single clock signal, does not have high order frequency.Therefore, bus plane of design is enough.
The number of plies of signal depends primarily on function and realizes, from the angle of electromagnetic compatibility (EMC), needs the shielding or the isolation information of taking into account critical signal network (intense radiation network and little, the weak signal that are subject to disturb).For optimal design,, design a signals layer and get final product simultaneously also in order to save cost.In a preferred embodiment of the invention, because wiring is rationally, so, signal and power sharing one deck, promptly printed circuit board comprises a layer signal and bus plane.
Printed circuit board (pcb) " " two kinds of implications are arranged usually: a kind of is " the earth " (safely), and another kind is " system benchmark ground " (signal ground).Ground connection just is meant the conductive path of between system and certain current potential reference field, setting up low-resistance.The current potential that " connects the earth " and be exactly with the earth is a benchmark, and is zero potential with the earth, is connected the circuit reference point with the earth.Good printed circuit board (pcb) ground connection is one of the important means that suppresses electromagnetic interference (EMI), improves electromagnetic compatibility (EMC) performance of printed circuit board (pcb).Correct ground connection can be improved the ability that printed circuit board (pcb) suppresses electromagnetic interference (EMI), can reduce its external electromagnetic interference (EMI) again.Power supply, ground level all can be used for reference planes, and certain shielding action is arranged.But comparatively speaking, power plane has higher characteristic impedance, has bigger current potential potential difference with datum.From the angle of shielding, ground level has generally all been done the ground connection processing, and as the reference level RP, its shield effectiveness is far superior to power plane.Therefore, reference planes generally all can preferentially be selected ground level.
The earthing mode of printed circuit board (pcb) has two kinds: single-point grounding and multipoint earthing.Single-point grounding refers in the total system to have only a physical points to be defined as the ground connection RP, other each need the point of ground connection all to be connected on this point.It has been generally acknowledged that: single-point grounding is applicable to (below the 1MHz) in the lower circuit of frequency.If the frequency of operation of system is higher, the single-point grounding meeting brings the problem of radiation.Each earth point is all directly received on its nearest ground plane in the multipoint earthing finger mark system circuit board (PCB), so that the length of ground lead is the shortest.The multipoint earthing circuit structure is simple, is applicable to higher (＞10MHz) the occasion of frequency of operation.But multipoint earthing may cause the many ground loops of the inner formation of printed circuit board (pcb), can bring the part electromagnetic interference (EMI).Why earth loop can cause electromagnetic interference (EMI), is because should be the physical entity of a zero potential, zero impedance ideally.But itself promptly there is resistive component that reactive component is arranged again practically, when electric current passes through this ground, will produces voltage drop.Ground can constitute the loop with All other routes (signal wire, power lead), when this loop is coupled in power transformation magnetic field at that time, just in ground circuit, produces induction electromotive force, and is coupled to All other routes by ground circuit, constitutes potential electromagnetic interference (EMI) and threatens.
In a preferred embodiment of the invention, because the clock signal frequency of circuit has reached 24MHz, therefore, earthing mode is chosen as multipoint earthing.That bring to multipoint earthing and the problem electromagnetic radiation that possibly bring, the number of plies on stratum is designed to totally three layers.Therefore, printed circuit board has four-sheet structure, is followed successively by the superiors stratum 5, signal and bus plane 6, middle stratum 7 and orlop stratum 8 from top to bottom.The edge on the superiors stratum 5 and orlop stratum 8 is tightly connected, and coats signal and bus plane 6 and middle stratum 7, so that electromagnetic radiation shielding better.
" hole " of printed circuit board (pcb) has 5 kinds, is respectively: via (a kind ofly be used for the plated through-hole that internal layer connects, wherein and be not used in insert component lead or other reinforcing material); Blind hole (only being extended to the via on a top layer in the printed circuit board); Buried via hole (not extending to a kind of via on printed circuit board surface); Via hole (being extended to the via on another top layer from a top layer of printed circuit board); Component hole (be used for the element madman and be fixed in the hole that printed circuit board and conductive pattern are electrically connected).Set about from the characteristics in each hole, the conducting Kongzui is fit to ground connection processing, and the screen of blind hole when satisfying the device connection imitated best.In order to suppress radiation to greatest extent, also fully take into account the relation between technology and the cost simultaneously, all ground holes are all done " via " and are handled, and other connecting hole is all done " blind hole " and is handled.
As shown in Figure 3, be the synoptic diagram of circuit module shielding cover board of the present invention.For the electromagnetic wave that further screened circuit module goes out to space radiation, the present invention is provided with circuit module shielding cover board 9.Shielding cover board 9 and the superiors stratum 5 and the orlop stratum 8 forming circuit module shield assembly that is tightly connected.Signal and bus plane 6 are arranged in the circuit module shield assembly with middle stratum 7.Front end right part at shielding cover board 9 is provided with wire hole 10, for drawing mouse cable 4.Screen layer in wire hole 10 place's mouse cable 4 is connected with shielding cover board atresia seam, to guarantee shield effectiveness.In the preferred embodiment of the invention, shielding cover board be shaped as irregular octahedron.This shape can be under the prerequisite that guarantees shield effectiveness, and optimization is utilized fixing space, mouse inside, simultaneously, can save material cost to greatest extent, saves the spent working time in the assembling process.
The material of shielding cover board 9 can be brass, aluminium, iron, gold or silver.The resistivity and the unit price of these materials are as shown in table 1.In the preferred embodiment of the invention, according to the Theoretical Calculation of required screening frequencies and the cost performance of the metal that each is common, consider the ductility and the engineering operability of each metal simultaneously with function of shielding, select the material of brass for use as shielding cover board 9.
About the setting of copper plate thickness, then need consider skin effect.The skin effect that electromagnetic induction produces, promptly conductor and power supply are isolated on circuit, and when supply frequency increased, electric current all only flowed along conductive surface.And the depth of penetration that skin effect had influence on, the amplitude of field amount was pressed the index law decay when promptly electromagnetic wave was propagated in conductor, and through decaying to initial value e/one apart from d, promptly 0.37 times, wherein d is the depth of penetration, is determined by following formula:
Wherein ρ is the conductor resistance rate, μ
rBe the conductor relative permeability, f is a supply frequency.
By top formula, bring actual value into: brass ρ=6.0 (10-8 Europe rice), μ
r=1, Theoretical Calculation goes out the minimum thickness d=0.39mm of brass sheet.
Process is to the Theoretical Calculation of the minimum thickness of brass sheet and the spatial analysis of maximum ga(u)ge, and to material cost and engineering operability and venture analysis, in a preferred embodiment of the invention, the thickness of selected brass sheet is 0.5mm.
Lead 45 outside surfaces of mouse cable 4 are enclosed with two-layer at least screen layer, wherein, at least one deck be copper mesh layers and at least one deck be the tinfoil layer.As shown in Figure 4, be the diagrammatic cross-section of mouse cable of the present invention.In the preferred embodiment of the invention, lead 45 outside surfaces of mouse cable 4 are enclosed with four layers of screen layer.These four layers of screen layers comprise two-layer copper mesh layers and two-layer tinfoil layer, and the intermeshing covering, promptly are tinfoil layer 44, copper mesh layers 43, tinfoil layer 42, copper mesh layers 41 from inside to outside successively.Adopt " copper " and " tin " these two kinds of metals to combine; Complementary its electromagnetic property; Thereby realized both keeping the advantage of these two kinds of metals; Remedied their deficiency again, reached the purpose that all has optimum shield effectiveness at 10kHz in the 18GHz, also reserved bigger shielding properties space simultaneously for other equipment of working simultaneously with mouse.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.
Common resistivity and the unit price of table 1 with metal of function of shielding
| The metal name | Resistivity (ohm/meter) | Unit price (unit/gram) |
| Silver | 1.62 | 7.8 |
| Brass | 1.69 | 0.07 |
| Aluminium | 2.83 | 0.02 |
| Gold | 2.4 | 321.7 |
| Iron | 10.0 | 0.04 |
Claims (10)
1. one kind low radiation mouse; Comprise printed circuit board, circuit module shield assembly and mouse cable; It is characterized in that: said printed circuit board is arranged in the said circuit module shield assembly, and said circuit module shield assembly is by the superiors stratum, and orlop stratum and shielding cover board sealing constitute; The lead outside surface of said mouse cable is enclosed with two-layer at least screen layer, and said two-layer at least screen layer comprises one deck copper mesh layers and one deck tinfoil layer at least at least.
2. low radiation mouse as claimed in claim 1 is characterized in that: said screen layer comprises two-layer copper mesh layers and two-layer tinfoil layer.
3. low radiation mouse as claimed in claim 2 is characterized in that: said two-layer copper mesh layers and two-layer tinfoil layer intermeshing cover, and lamination order from inside to outside is followed successively by tinfoil layer, copper mesh layers, tinfoil layer, copper mesh layers.
4. low radiation mouse as claimed in claim 1 is characterized in that: the material of said shielding cover board is brass, aluminium, iron, gold or silver.
5. low radiation mouse as claimed in claim 1 is characterized in that: the front end right part at said shielding cover board is provided with wire hole.
6. low radiation mouse as claimed in claim 1 is characterized in that: said printed circuit board comprises at least one layer signal layer, one deck bus plane and multilayer stratum at least.
7. low radiation mouse as claimed in claim 6 is characterized in that: said signals layer and the shared one deck of said bus plane, and said stratum is three layers; Said printed circuit board lamination order from top to bottom is followed successively by said the superiors stratum, signal and bus plane, middle stratum and said orlop stratum.
8. low radiation mouse as claimed in claim 7 is characterized in that: the material on said the superiors stratum and said orlop stratum is a tin.
9. low radiation mouse as claimed in claim 7, it is characterized in that: said printed circuit board is provided with ground hole and connecting hole, and wherein, said ground hole is a via, and said connecting hole is a blind hole.
10. low radiation mouse as claimed in claim 1; It is characterized in that: said low radiation mouse also comprises mouse case, button and roller; Wherein, Said button and said roller are inlaid on the upper surface of said mouse case, and said printed circuit board and said circuit module shield assembly are arranged on the said mouse case inner bottom surface, and said mouse cable is drawn through the wire hole that is arranged on the mouse case front end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100404650A CN102591495A (en) | 2012-02-20 | 2012-02-20 | Low-radiation mouse |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100404650A CN102591495A (en) | 2012-02-20 | 2012-02-20 | Low-radiation mouse |
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| Publication Number | Publication Date |
|---|---|
| CN102591495A true CN102591495A (en) | 2012-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100404650A Pending CN102591495A (en) | 2012-02-20 | 2012-02-20 | Low-radiation mouse |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107943329A (en) * | 2017-12-05 | 2018-04-20 | 柳州市信吉商贸有限责任公司 | Anti-interference computer accessory |
| CN108491097A (en) * | 2018-02-06 | 2018-09-04 | 柳州佰利科技有限责任公司 | A kind of anti-tampering mouse |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1112803A (en) * | 1993-06-24 | 1995-11-29 | 北方电讯有限公司 | A multiple layer printed circuit board |
| CN2802576Y (en) * | 2005-03-15 | 2006-08-02 | 中国航天科工集团第二研究院七○六所 | Low radiation photoelectric mouse |
| CN101174493A (en) * | 2006-11-02 | 2008-05-07 | 深圳市联丰电子有限公司 | Communication transmission cable |
| CN202093477U (en) * | 2011-01-31 | 2011-12-28 | 盖志武 | Computer mouse capable of preventing electromagnetic radiation |
| CN202486727U (en) * | 2012-02-20 | 2012-10-10 | 安方高科电磁安全技术(北京)有限公司 | Low-radiation mouse |
-
2012
- 2012-02-20 CN CN2012100404650A patent/CN102591495A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1112803A (en) * | 1993-06-24 | 1995-11-29 | 北方电讯有限公司 | A multiple layer printed circuit board |
| CN2802576Y (en) * | 2005-03-15 | 2006-08-02 | 中国航天科工集团第二研究院七○六所 | Low radiation photoelectric mouse |
| CN101174493A (en) * | 2006-11-02 | 2008-05-07 | 深圳市联丰电子有限公司 | Communication transmission cable |
| CN202093477U (en) * | 2011-01-31 | 2011-12-28 | 盖志武 | Computer mouse capable of preventing electromagnetic radiation |
| CN202486727U (en) * | 2012-02-20 | 2012-10-10 | 安方高科电磁安全技术(北京)有限公司 | Low-radiation mouse |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107943329A (en) * | 2017-12-05 | 2018-04-20 | 柳州市信吉商贸有限责任公司 | Anti-interference computer accessory |
| CN108491097A (en) * | 2018-02-06 | 2018-09-04 | 柳州佰利科技有限责任公司 | A kind of anti-tampering mouse |
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Application publication date: 20120718 |