CN102316666A - Circuit structure of printed circuit board - Google Patents
Circuit structure of printed circuit board Download PDFInfo
- Publication number
- CN102316666A CN102316666A CN2010102234886A CN201010223488A CN102316666A CN 102316666 A CN102316666 A CN 102316666A CN 2010102234886 A CN2010102234886 A CN 2010102234886A CN 201010223488 A CN201010223488 A CN 201010223488A CN 102316666 A CN102316666 A CN 102316666A
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- Prior art keywords
- circuit
- width
- difference value
- circuit board
- printed circuit
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- 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.)
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- Structure Of Printed Boards (AREA)
Abstract
The invention discloses a circuit structure of a printed circuit board. The width of the upper surface of a circuit is defined as an upper circuit width, the width of the lower surface of the circuit is defined as a lower circuit width, the difference of the lower circuit width and the upper circuit width is defined as a difference value, the difference value is less than or equal to 0.5mil; and during the design, the difference value is set to be 0.5mil, the circuit size structure ensures that the resistance of the circuit is easier to control, is beneficial to reduction of abnormal resistance and accords with the actual process capability.
Description
Technical field
The line construction that the present invention relates to a kind of printed circuit board (PCB) improves, and specifically relates to a kind of unusual line construction of impedance that can reduce and designs.
Background technology
The circuit of printed circuit board (PCB) is because different with the contact amount and the time of contact of etching liquid medicine during etching; The cross section of the circuit that therefore etches is not a square; But it is trapezoidal; Be the upper surface width of circuit---upward live width is descended live width one by one less than the lower surface width of circuit, will descend the difference of live width and last live width to be called difference value (R value) in the printed circuit board industry.In circuit, the inhibition that alternating current rose is called impedance with resistance, inductance and electric capacity.The live width difference value produces certain influence for the impedance meeting of circuit up and down.In when design, generally the difference value with the upper and lower live width of circuit is designed to about 1mi1 (0.0254mm), and this big or small difference value can make impedance be difficult to management and control.
Summary of the invention
In order to overcome above-mentioned defective, the invention provides a kind of line construction of printed circuit board (PCB), the line construction of this printed circuit board (PCB) not only meets actual processing procedure ability, and it is unusual more to reduce impedance, and simple in structure, easy to implement.
The present invention for the technical scheme that solves its technical problem and adopt is:
A kind of line construction of printed circuit board (PCB); The width of the upper surface of circuit is defined as live width; The width of the lower surface of circuit is defined as down live width, the difference of live width and last live width down is defined as difference value, said difference value is smaller or equal to 0.0127mm (0.5mil).When design, difference value is set at 0.5mil.
Further technical scheme of the present invention is:
When the copper thickness of circuit was 35 μ m (1 ounce), the mean value of said difference value was 0.0098044mm (0.386mil).
When the copper thickness of circuit was 17.5 μ m (0.5 ounce), the mean value of said difference value was 0.0062992mm (0.248mil).
Said circuit is the internal layer circuit of printed circuit board (PCB).
The invention has the beneficial effects as follows: the line construction of printed circuit board (PCB) of the present invention is because the actual size of the difference value of the following live width of its circuit and last live width is smaller or equal to 0.5mil; Difference value during design is 0.5mil; Therefore the impedance of circuit is easier to management and control; It is unusual to help reducing impedance, and meets actual processing procedure ability.
Description of drawings
Fig. 1 is the cross-sectional view of circuit according to the invention.
Embodiment
Embodiment: a kind of line construction of printed circuit board (PCB); The width of the upper surface 1 of circuit is defined as live width; The width of the lower surface 2 of circuit is defined as down live width, the difference of live width and last live width down is defined as difference value, said difference value is smaller or equal to 0.0127mm (0.5mil).When design, difference value is set at 0.5mil.
When the copper thickness of circuit was 35 μ m (1 ounce), the mean value of said difference value was 0.0098044mm (0.386mil).
When the copper thickness of circuit was 17.5 μ m (0.5 ounce), the mean value of said difference value was 0.0062992mm (0.248mil).
Said circuit is the internal layer circuit of printed circuit board (PCB).
Claims (4)
1. the line construction of a printed circuit board (PCB); The width of the upper surface (1) of circuit is defined as live width; The width of the lower surface (2) of circuit is defined as down live width, the difference of live width and last live width down is defined as difference value, it is characterized in that: said difference value is smaller or equal to 0.0127mm.
2. the line construction of printed circuit board (PCB) according to claim 1, it is characterized in that: when the copper thickness of circuit was 35 μ m, the mean value of said difference value was 0.0098044mm.
3. the line construction of printed circuit board (PCB) according to claim 1, it is characterized in that: when the copper thickness of circuit was 17.5 μ m, the mean value of said difference value was 0.0062992mm.
4. according to the line construction of the described printed circuit board (PCB) of one of claim 1 to 3, it is characterized in that: said circuit is the internal layer circuit of printed circuit board (PCB).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102234886A CN102316666A (en) | 2010-07-02 | 2010-07-02 | Circuit structure of printed circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102234886A CN102316666A (en) | 2010-07-02 | 2010-07-02 | Circuit structure of printed circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102316666A true CN102316666A (en) | 2012-01-11 |
Family
ID=45429364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102234886A Pending CN102316666A (en) | 2010-07-02 | 2010-07-02 | Circuit structure of printed circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102316666A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107404802A (en) * | 2017-08-21 | 2017-11-28 | 广东欧珀移动通信有限公司 | Printed circuit board, the preparation method of printed circuit board and electronic equipment |
-
2010
- 2010-07-02 CN CN2010102234886A patent/CN102316666A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107404802A (en) * | 2017-08-21 | 2017-11-28 | 广东欧珀移动通信有限公司 | Printed circuit board, the preparation method of printed circuit board and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120111 |