CN201797646U - Printed circuit board (PCB) structure capable for improving difference of dimensional stability of multilayer board - Google Patents

Printed circuit board (PCB) structure capable for improving difference of dimensional stability of multilayer board Download PDF

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Publication number
CN201797646U
CN201797646U CN2010205396110U CN201020539611U CN201797646U CN 201797646 U CN201797646 U CN 201797646U CN 2010205396110 U CN2010205396110 U CN 2010205396110U CN 201020539611 U CN201020539611 U CN 201020539611U CN 201797646 U CN201797646 U CN 201797646U
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China
Prior art keywords
pcb
dimensional stability
prepregs
prepreg
improving
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Expired - Lifetime
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CN2010205396110U
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Chinese (zh)
Inventor
吴小连
叶锦荣
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Shengyi Technology Co Ltd
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Shengyi Technology Co Ltd
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Priority to CN2010205396110U priority Critical patent/CN201797646U/en
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Anticipated expiration legal-status Critical
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Abstract

The utility model provides a printed circuit board (PCB) structure capable for improving the difference of the dimensional stability of a multilayer board. The structure comprises an inner-layer core board, a plurality of outer prepregs which are covered at two sides of the inner-layer core board, and a plurality of copper foils which are covered on the outer prepregs, wherein the inner-layer core board comprises a plurality of layers of copper foils and a plurality of inner prepregs which are arranged among the copper foils at intervals, the inner prepregs and the outer prepregs comprise reinforcing materials and insulating resin layers coated on two sides of the reinforcing materials, and the glass fiber paper is used as the reinforcing materials. Compared with the common glass fiber cloth, the glass fiber paper made from the reinforcing materials has coincident longitudinal and latitudinal coefficient of thermal expansion (CTE), so that the PCB structure has coincident expansion and contraction, thus greatly improving the problem of the dimensional stability of the conventional multilayer PCB caused by the anisotropic difference of the conventional prepregs, effectively preventing the problem that the apposition is inaccurate when the multilayer PCB is manufactured, improving the machining yield, and greatly reducing the comprehensive cost of the multilayer PCB.

Description

Improve the PCB structure of multi-layer sheet dimensional stability difference
Technical field
The utility model relates to the printed wiring board technical field, relates in particular to a kind of PCB structure of improving multi-layer sheet dimensional stability difference.
Background technology
The all materials of printed wiring board mainly are as reinforcing material with glass fabric in the industry at present, its model difference different through the weft yarn number or used yarn, cause CTE (thermal coefficient of expansion) difference of sheet material on warp, latitude direction, thereby make used core material of multi-layer PCB and prepreg in multi-layer sheet pressing process, warp, broadwise can produce different contractions.And the contraction difference of warp, latitude direction can directly cause the contraposition between each layer of multi-layer sheet difference to occur, and especially in high multilayer, the accurate contraposition of each interlayer is the emphasis of high multi-layer PCB production control always in the one step press process.
Along with electronic product develops to high multilayer, the accurate contraposition of PCB interlayer is proposed higher requirement, the traditional existing warp of glass cloth prepreg, latitude direction harmomegathus is inconsistent will to be difficult to satisfy such high request.
The utility model content
The purpose of this utility model is, a kind of PCB structure of improving multi-layer sheet dimensional stability difference is provided, and can improve the problem of multi-layer PCB dimensional stability difference greatly, avoids the inaccurate problem of contraposition that occurs in the multi-layer PCB manufacturing process.
To achieve these goals, the utility model provides a kind of PCB structure of improving multi-layer sheet dimensional stability difference, it comprises: core material, be laminated with the outer prepreg of core material both sides and be laminated with Copper Foil on the outer prepreg, core material comprises that several layers of Copper Foil and several are located at the interior prepreg between Copper Foil at interval, this inside and outside prepreg includes reinforcing material, is coated with the insulating resin layer of being located on the reinforcing material two sides, and this reinforcing material is a glass paper.
Described reinforcing material is 25~105g/m 2Glass paper.
The resin content of described inside and outside prepreg is 75~95%.
Described core material two opposite outer is a Copper Foil, and outer prepreg covers on the Copper Foil in this two outside.
The beneficial effects of the utility model: the PCB structure of improving multi-layer sheet dimensional stability difference of the present utility model, adopting glass paper is its reinforcing material, glass cloth compared to the routine use, this glass paper warp, broadwise CTE unanimity, thereby harmomegathus unanimity, can improve the dimensional stability problem that multi-layer PCB causes because of the anisotropy difference of traditional prepreg greatly, effectively avoid the inaccurate problem of the contraposition that occurs in the multi-layer PCB manufacturing process, improve passing rate of processing, and can significantly reduce the integrated cost of such multi-layer PCB.
In order further to understand feature of the present utility model and technology contents, see also following about detailed description of the present utility model and accompanying drawing, yet accompanying drawing only provide with reference to and the explanation usefulness, be not to be used for the utility model is limited.
Description of drawings
Below in conjunction with accompanying drawing,, will make the technical solution of the utility model and other beneficial effect apparent by embodiment of the present utility model is described in detail.
In the accompanying drawing,
Fig. 1 improves the structural representation of inside and outside prepreg in the PCB structure of multi-layer sheet dimensional stability difference for the utility model;
Fig. 2 is the part plan structural representation of reinforcing material in the utility model (glass paper).
Embodiment
Below in conjunction with accompanying drawing the utility model is described in detail.
The PCB structure of improving multi-layer sheet dimensional stability difference of the utility model one embodiment, it comprises: core material, be laminated with the outer prepreg of core material both sides and be laminated with Copper Foil (not shown) on the outer prepreg, core material comprises that several layers of Copper Foil and several are located at the interior prepreg between Copper Foil at interval.The core material two opposite outer is a Copper Foil, and outer prepreg covers on the Copper Foil in this two outside.As shown in Figure 1, this inside and outside prepreg includes reinforcing material 1, is coated with the insulating resin layer 2 that is located on reinforcing material 1 two sides, and this reinforcing material 1 is a glass paper.
Described reinforcing material 1 adopts 25~105g/m 2Glass paper, as shown in Figure 2, the architectural characteristic that described glass paper has is loose, astaticism distributes can be eliminated the warp that the existing warp of glass cloth, broadwise CTE difference caused, the difference of broadwise dimensional stability with it as reinforcing material, is beneficial to the accurate contraposition of interlayer of the multi-layer PCB of making.Using the resin content of the inside and outside prepreg that this kind glass cloth makes is 75~95%.
When inside and outside prepreg of the present utility model is made, use glass paper as reinforcing material 1, apply insulating resin in its surface, then in baking oven behind the high-temperature baking semi-solid preparation, resin forms insulating resin layer 2 on reinforcing material 1 two sides, be 75~95% inside and outside prepreg thereby make resin content.Core material is made in interior prepreg and Copper Foil pressing that employing makes, these core material two outsides are Copper Foil, on outer prepreg pressing core material, pressing Copper Foil on the prepreg outside promptly makes the described PCB structure of improving multi-layer sheet dimensional stability difference again.Wherein core material can be had a sandwich construction, adopts promptly that prepregs are pressed between the several layers of Copper Foil at interval in several pieces.
As process a 10 layers of pcb board, and this plate uses core material to be 6mil 2/2 in having now, joins originally to be: 2*1080, and glass cloth prepreg is 2116, needs core material is compensated before processing, penalty coefficient is a warp-wise-1.6, broadwise-0.9; After boring processing, still there is a certain proportion of contraposition to be forbidden phenomenon, need do for supplement.And adopt 10 layers of pcb board that improve the PCB structure fabrication of multi-layer sheet dimensional stability difference of the present utility model, use 1 25g/m 2The interior prepreg that glass paper is made, RC% (resin content) is 75~95%, can replace 2 1080 glass cloth semi-solid preparations to produce the core material of 6mil 2/2, has avoided the difference through the CTE of, broadwise, simultaneously, uses 1 50g/m 2The outer prepreg that glass paper is made can replace 2 2116 glass cloth prepregs in this structure, RC% is 75~95%, after the multi-layer PCB board moulding, the difference of the CTE of warp, broadwise has also been eliminated, be in the whole multi-layer PCB board structure, all use glass paper to replace former used glass cloth, thoroughly eliminated the otherness of dimensional stability of warp, the broadwise of multi-layer PCB board, core material compensates in advance by original penalty coefficient, boring processing behind the lamination, the accurate contraposition of hole potential energy of interlayer, qualification rate reaches 100%.And cost has bigger competitive advantage than original structure.
In sum, the PCB structure of improving multi-layer sheet dimensional stability difference of the present utility model, adopting glass paper is its reinforcing material, glass cloth compared to the routine use, this glass paper warp, broadwise CTE unanimity, thereby harmomegathus unanimity, can improve the dimensional stability problem that multi-layer PCB causes because of the anisotropy difference of traditional prepreg greatly, effectively avoid the inaccurate problem of the contraposition that occurs in the multi-layer PCB manufacturing process, improve passing rate of processing, and can significantly reduce the integrated cost of such multi-layer PCB.
The above; for the person of ordinary skill of the art; can make other various corresponding changes and distortion according to the technical solution of the utility model and technical conceive, and all these changes and distortion all should belong to the protection range of the utility model claim.

Claims (4)

1. PCB structure of improving multi-layer sheet dimensional stability difference, it is characterized in that, it comprises: core material, be laminated with at the outer prepreg of core material both sides and be laminated with Copper Foil on the prepreg outside, core material comprises that several layers of Copper Foil and several are located at the interior prepreg between Copper Foil at interval, this inside and outside prepreg includes reinforcing material, is coated with the insulating resin layer of being located on the reinforcing material two sides, and this reinforcing material is a glass paper.
2. the PCB structure of improving multi-layer sheet dimensional stability difference as claimed in claim 1 is characterized in that described reinforcing material is 25~105g/m 2Glass paper.
3. the PCB structure of improving multi-layer sheet dimensional stability difference as claimed in claim 1 is characterized in that the resin content of described inside and outside prepreg is 75~95%.
4. the PCB structure of improving multi-layer sheet dimensional stability difference as claimed in claim 1 is characterized in that described core material two opposite outer is a Copper Foil, and outer prepreg covers on the Copper Foil in this two outside.
CN2010205396110U 2010-09-21 2010-09-21 Printed circuit board (PCB) structure capable for improving difference of dimensional stability of multilayer board Expired - Lifetime CN201797646U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010205396110U CN201797646U (en) 2010-09-21 2010-09-21 Printed circuit board (PCB) structure capable for improving difference of dimensional stability of multilayer board

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010205396110U CN201797646U (en) 2010-09-21 2010-09-21 Printed circuit board (PCB) structure capable for improving difference of dimensional stability of multilayer board

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CN201797646U true CN201797646U (en) 2011-04-13

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102416728A (en) * 2011-09-25 2012-04-18 顾根山 Polytetrafluoroethylene glass fiber paper copper clad laminate
CN102442029A (en) * 2011-09-25 2012-05-09 顾根山 Preparation method of polyfluortetraethylene glass fiber paper copper clad laminate
CN107567194A (en) * 2017-10-31 2018-01-09 广东骏亚电子科技股份有限公司 A kind of compression method of PCB copper-clad plates
CN110337198A (en) * 2019-04-28 2019-10-15 深圳崇达多层线路板有限公司 A kind of production method for the PCB reducing plate thickness

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102416728A (en) * 2011-09-25 2012-04-18 顾根山 Polytetrafluoroethylene glass fiber paper copper clad laminate
CN102442029A (en) * 2011-09-25 2012-05-09 顾根山 Preparation method of polyfluortetraethylene glass fiber paper copper clad laminate
CN107567194A (en) * 2017-10-31 2018-01-09 广东骏亚电子科技股份有限公司 A kind of compression method of PCB copper-clad plates
CN110337198A (en) * 2019-04-28 2019-10-15 深圳崇达多层线路板有限公司 A kind of production method for the PCB reducing plate thickness

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Granted publication date: 20110413