CN200990721Y - Master board - Google Patents
Master board Download PDFInfo
- Publication number
- CN200990721Y CN200990721Y CN 200620016780 CN200620016780U CN200990721Y CN 200990721 Y CN200990721 Y CN 200990721Y CN 200620016780 CN200620016780 CN 200620016780 CN 200620016780 U CN200620016780 U CN 200620016780U CN 200990721 Y CN200990721 Y CN 200990721Y
- Authority
- CN
- China
- Prior art keywords
- mainboard
- copper foil
- cabling
- protective wire
- width
- Prior art date
- 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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Abstract
The utility model relates to a mainboard, comprises a printing circuit board, the copper foil routing are arranged on the printing board, the copper foil routing is provided with an opening which can not cover the copper foil. The copper foil at the two sides of opening can burn out timely when the routing is overcurrent, which plays a role of protecting the mainboard circuit and reducing the output quantity of smoke when the circuit is overcurrent and burns out.
Description
Technical field
The utility model relates to a kind of mainboard, particularly relates to a kind of mainboard with special cabling.
Background technology
The bare board of mainboard is a PCB (Printed Circuit Board, printed circuit board (PCB)) plate, the substrate of pcb board itself is made by heat insulation, the unbending material of insulation, the material of being located at the tiny circuit on its surface is a Copper Foil, Copper Foil covers on the whole pcb board originally, part is etched in manufacture process disposes, and the part that stays just becomes netted tiny circuit.These circuits are known as lead or claim wiring, and the circuit that is used to provide part on the pcb board connects.
The width of the cabling on traditional mainboard is consistent everywhere, even if the cabling that crawls also is like this.The live width of cabling is big more, and its resistance is more little, and anti-flow valuve is big more.The outermost layer of the pcb board of mainboard is covered in the green oil on the cabling usually in addition, as the insulating protective film of these cablings, in case be short-circuited when the conductor contact circuit plate in the external world.When the electric current by cabling had surpassed the maximum anti-flow valuve of described cabling, the green oil on the cabling can be because overheated and burn, and emit a large amount of cigarettes, and environment is polluted.The mainboard industry is in order to prevent contaminated environment, even the mainboard that regulation is produced burns because of the cabling overcurrent, its cigarette amount can not surpass the cigarette amount that Linear Leaf Speedwell cigarette static combustion produces, therefore mainboard must be through test to guarantee that it meets industry to putting the regulation of cigarette amount before dispatching from the factory, this just requires the cabling of mainboard enough wide, can bear bigger electric current, can not be blown, it is enough little perhaps to blow the cigarette amount that is produced.But be subject to the size of mainboard, can not widen cabling arbitrarily.
Summary of the invention
In view of above content, be necessary to provide a kind of and do not widen cabling and meet the mainboard of industry the regulation of putting the cigarette amount.
A kind of mainboard comprises a printed circuit board (PCB), and described printed circuit board (PCB) is provided with the Copper Foil cabling, and described Copper Foil cabling has an opening that does not cover Copper Foil.
Compared to prior art, the utility model mainboard is provided with the special cabling of at least one shape, when electric current is excessive, the Copper Foil of described opening both sides can be because of overheated timely fusing, emit the cigarette amount seldom, after the fusing, the electric current on the described cabling is zero, therefore can not prolong and the other parts of cabling, thereby the maximum that the cigarette amount is controlled at the industry regulation is put in the scope of cigarette amount.
Description of drawings
Fig. 1 is the stereogram of the utility model mainboard better embodiment.
Embodiment
Please refer to Fig. 1, the utility model mainboard better embodiment comprises a printed circuit board (PCB) 10, and described printed circuit board (PCB) 10 is provided with the Copper Foil cabling, and the etched oblong openings of a Copper Foil 16 is arranged at the middle part of described Copper Foil cabling.Described Copper Foil cabling comprise a pair of symmetry that is parallel to each other protective wire 12 and with this to protective wire 12 about two sections main lines 14 linking to each other respectively of two ends.The live width of described main line 14 is a fixed value A, and this live width to protective wire 12 is B, and length is C, and the live width A of described main line 14 is greater than this live width sum to protective wire 12, i.e. A＞2B; The length of each protective wire 12 is all less than the length sum of these two sections main lines 14, in order to avoid the pressure drop affects on the described protective wire 12 is to the specification of power supply.Described opening 16 is surrounded by described a pair of protective wire 12 and described two sections main lines 14, and its length is C, and width is D, and the width of described opening 16 equals poor to the live width sum of protective wire 20 of described main line 14 live widths and this, i.e. D=A-2B.The lateral border of a described wherein protective wire 12 is concordant with a lateral border of described two sections main lines 14, and the lateral border of another protective wire 12 is concordant with the lateral border of the opposite side of described two sections main lines 14.Be coated with the insulation protection green oil on the Copper Foil of described main line 14, be coated with one deck tin on the Copper Foil of described protective wire 12, prevent the Copper Foil oxidation as diaphragm.
Because the live width of Copper Foil cabling is more little, its resistance is big more, and anti-flow valuve is more little, according to the Joule law electric heating Q=I that produces of pure resistance as can be known
2Rt; described main line 14 equates with described protective wire 12 series connection thereby electric current everywhere; the live width of described protective wire 12 is less; resistance is big; so electric heating that the electric heating that produces produces greater than described main line 14; loading or short circuit when causing described Copper Foil cabling overcurrent, described protective wire 12 is easier to fusing, and its effect is similar to fuse.Owing to do not cover green oil on the described protective wire 12; so when described protective wire 12 can fuse automatically in the overcurrent heating; can not prolong and described main line 14 in case the burning of green oil on the main line 14; therefore; the cigarette amount of emitting seldom; both can protect the components and parts on the mainboard can not damage because of overcurrent, the maximum that the cigarette amount can be controlled at mainboard industry regulation is again put in the cigarette amount.
On mainboard, the power supply cabling is the easiest in overcurrent burns out, and in this preferred embodiment, described protective wire 12 is the power supply cabling, and an end connects power supply, and another end connects the chip on the mainboard.
Claims (7)
1. a mainboard comprises a printed circuit board (PCB), and described printed circuit board (PCB) is provided with a Copper Foil cabling, it is characterized in that: described Copper Foil cabling has an opening that does not cover Copper Foil.
2. mainboard as claimed in claim 1; it is characterized in that: described Copper Foil cabling comprises two sections main lines and a pair of protective wire that is connected between described two sections main lines; described opening is formed at this between the protective wire, and the width of described two sections main lines is all greater than this width sum to protective wire.
3. mainboard as claimed in claim 2 is characterized in that: this of described Copper Foil cabling is to the protective wire symmetry that is parallel to each other, and the width of described two sections main lines equates.
4. mainboard as claimed in claim 3 is characterized in that: the length of described opening is consistent with the length of each protective wire, and the live width that width equals described main line deducts this live width sum to protective wire.
5. mainboard as claimed in claim 1 is characterized in that: the length of described each protective wire is all less than the length sum of described two sections main lines.
6. mainboard as claimed in claim 1 is characterized in that: described Copper Foil cabling is a power supply cabling.
7. mainboard as claimed in claim 6 is characterized in that: an end of described Copper Foil cabling connects a power supply, and another end connects the chip on the described mainboard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620016780 CN200990721Y (en) | 2006-12-27 | 2006-12-27 | Master board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620016780 CN200990721Y (en) | 2006-12-27 | 2006-12-27 | Master board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200990721Y true CN200990721Y (en) | 2007-12-12 |
Family
ID=38941748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620016780 Expired - Fee Related CN200990721Y (en) | 2006-12-27 | 2006-12-27 | Master board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200990721Y (en) |
-
2006
- 2006-12-27 CN CN 200620016780 patent/CN200990721Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: CO-PATENTEE TO: FOXCONN PRECISE INDUSTRY STOCK CO., LTD. ^ |
|
| CU01 | Correction of utility model |
Correction item: Co-patentee Correct: Hon Hai Precision Industry Co Number: 50 Page: The title page Volume: 23 |
|
| CU03 | Publication of corrected utility model |
Correction item: Co-patentee Correct: Hon Hai Precision Industry Co Number: 50 Volume: 23 |
|
| ERR | Gazette correction |
Free format text: CORRECT: CO-PATENTEE; FROM: NONE ^ TO: FOXCONN PRECISE INDUSTRY STOCK CO., LTD. ^ |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071212 Termination date: 20100127 |