CN202799390U - Flexible circuit board with improved weldability and LED strip - Google Patents
Flexible circuit board with improved weldability and LED strip Download PDFInfo
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- CN202799390U CN202799390U CN2012202792266U CN201220279226U CN202799390U CN 202799390 U CN202799390 U CN 202799390U CN 2012202792266 U CN2012202792266 U CN 2012202792266U CN 201220279226 U CN201220279226 U CN 201220279226U CN 202799390 U CN202799390 U CN 202799390U
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Abstract
The utility model relates to a flexible circuit board with improved weldability and an LED strip. Particularly, the utility model provides a flexible circuit board with improved weldability, which comprises a metal circuit layer, and a covering film or welding-resistant ink, wherein welding points are arranged on the metal circuit layer; the covering film or welding-resistant ink covers the metal circuit layer without covering the welding points; and a metal plating layer is arranged on the welding points. The utility model also discloses an LED strip containing the flexible circuit board. As each welding point is subjected to the metal plating treatment, the oxidization resistance and the weldability are greatly improved, and the material cost and the manufacture cost can be greatly lowered, such that the reliability and the yield of the circuit board are improved.
Description
Technical field
The utility model relates to the field of flexible circuit board (FPC), is specifically related to a kind of flexible circuit board and LED lamp band and manufacture craft thereof with solderability of novel improvement.
Background technology
No matter the flexible circuit board of prior art is single sided board, double sided board or multi-panel, generally all adopts copper material or Cu alloy material as wiring material layer.For example, in traditional double-faced flexible wiring board, as shown in Figure 1, the structure of its flexible circuit board is, the centre is a layer insulating 6 (for example being made by typical PI material), is respectively equipped with the line layer 3,7 that Copper Foil is made on the two sides of insulating barrier, the outside at this two-layer line layer is respectively equipped with the covering rete 5,5 that (for example mode of bonding, coating, coating or printing) play protective action (be typically CVL or relevant can resistant to elevated temperatures PVC class insulating material).
The defective of the flexible circuit board of this prior art is many-sided.
For example, Copper Foil is very high as its material cost of wiring material layer, and the cost of raw material of copper material will be more and more higher, so the cost of traditional circuit plate is very high.Even some manufacturer is in order to save material cost, copper thickness is reduced, but material cost is still high, does like this service behaviour that copper thickness is excessively reduced and cause affecting wiring board, for example reliability, intensity, conductivity, thermal diffusivity etc.
The more important thing is that the solder joint on the line layer of this flexible circuit board (or title " pad ") obviously also is the brazing point.If this brazing point is exposed to meeting oxidation within very short time in the air ambient, so that in the technique of follow-up welding electronic component, affect its solderability, for example can cause after solder joint sealing-off, the welding poorly conductive, solder bond intensity is low even do not weld, etc.For this reason; in the prior art; the manufacturer usually understands butt welding point and carries out Passivation Treatment with chemical method; but; the effect of this Passivation Treatment is still bad; brazing point after the passivation still can severe oxidation after the long period in being exposed to air, solderability and the soldering reliability of impact welding procedure subsequently.In the practice of prior art, because the brazing point solderability of flexible circuit board is poor, causing the problems of welded quality of application product such as LED lamp band, LED module etc., and then affect the situation in rate of finished products, reliability and the useful life of application product, is very general.
Therefore, in this area in the urgent need to a kind of flexible circuit board and manufacture craft thereof with solderability of improvement, with alleviate or even avoid defects, and reduce product cost.
Summary of the invention
In view of the above, the utility model has been proposed.The utility model is intended to solve above technical problem with other.
According to the utility model, a kind of flexible circuit board with solderability of improvement is provided, comprising: the metallic circuit layer, described metallic circuit layer is provided with solder joint; Cover on the described metallic circuit layer but do not cover coverlay or the welding resistance printing ink of described solder joint, it is characterized in that: described solder joint is provided with the coat of metal.
According to a preferred embodiment of the present utility model, described metallic circuit layer is the aluminum or aluminum alloy line layer.
According to another preferred embodiment of the present utility model, described metallic circuit layer is aluminium foil layer, alloy foil layer, aluminium alloy conductor layer or aluminum conductor layer.
According to another preferred embodiment of the present utility model, described metallic circuit layer is copper foil layer, copper alloy foil layer, copper alloy wire layer, copper conductor layer, aluminium nickel coat, copper-clad nickel dam, iron layer or steel layer.
According to another preferred embodiment of the present utility model, the described coat of metal is nickel coating, nickel plating alloy layer, silver coating, zinc coat or tin coating.
According to another preferred embodiment of the present utility model, described metallic circuit layer is the aluminum or aluminum alloy line layer, and the described coat of metal is chemical Ni-plating layer; Perhaps described metallic circuit layer is copper or copper alloy circuit layer, and the described coat of metal is chemical Ni-plating layer.
According to another preferred embodiment of the present utility model, the described coat of metal is composite deposite.
According to another preferred embodiment of the present utility model, described composite deposite is copper facing internal layer and the outer field combination of nickel plating, or zinc-plated internal layer and the outer field combination of nickel plating.
According to another preferred embodiment of the present utility model, the thickness of described metallic circuit layer is the 10-1000 micron.
The utility model also provides a kind of LED lamp band, and it comprises according to flexible circuit board of the present utility model and is welded on LED on the described solder joint.
Flexible circuit board of the present utility model is because its solder joint has passed through coat of metal processing anti-oxidant and that have superior solderability, therefore non-oxidizability and solderability are improved greatly, and its material cost and cost of manufacture can reduce greatly, thereby have improved reliability and the yields of wiring board product.
In following description to the drawings and specific embodiments, will set forth one or more embodiments of the detail of the present utility model.From these descriptions, accompanying drawing and claim, can know other features, objects and advantages of the present utility model.
Description of drawings
By reading in conjunction with the following drawings this specification, it is more apparent that feature of the present utility model, purpose and advantage will become, in the accompanying drawings:
Fig. 1 is the partial section of the double-faced flexible wiring board of prior art, has shown the structure of the double-faced flexible wiring board of prior art, comprises copper foil circuit layer and covering coverlay in the above; And
Fig. 2 has shown the partial section of the single-sided flexible circuit board of prior art, has shown the structure of the single-sided flexible circuit board of prior art, comprises copper foil circuit layer and covering front coverlay in the above.
Fig. 3 has shown the front schematic view of single or double flexible circuit board, has shown copper foil circuit layer, coverlay, and the solder joint of the not coating epiphragma that exposes covering.
Embodiment
The below will be described in more detail the utility model.
The single face (being the side of mounting related components) that term " one-sided circuit board " only refers at this wiring board is provided with circuit.
Term " double-sided wiring board " refers on the two sides of this wiring board and all is provided with circuit.
Before describing the utility model in detail, those skilled in the art are to be understood that, " components and parts " should do the understanding on the most wide in range connotation in this application, the components and parts that namely comprise all types of electronic devices and components for circuit, electric components or other type, various resistance for example, the components and parts of various surface mount (SMT) type, the components and parts of support rack type, various high power devices etc., comprise great power LED, etc.
In addition, term " wiring board " and " circuit board " can use interchangeably in the application.
Be described in further detail below in conjunction with manufacturing process and the structure of drawings and Examples to flexible circuit board of the present utility model.
The related materials of flexible circuit board
The raw material volume of traditional double-faced flexible wiring board is also referred to as the coiled material of copper-clad plate.As shown in Figure 1, Fig. 1 is the partial section of the flexible circuit board of prior art, has shown the structure of the flexible circuit board of prior art.In the structure of this flexible circuit board, typical structure is five layers, namely, two-layer line layer 3,7 (modal is to adopt Copper Foil, can be described as again in the present embodiment and covers copper layer or Copper Foil, and these terms use sometimes interchangeably), and be bonded in insulating barrier 6 between this two-layer line layer 3,7.Insulating barrier 6 has formed the basal layer of flexible circuit.The outside at this two-layer line layer 3,7 is respectively equipped with the covering rete 5,5 that (for example mode of bonding, coating, coating or printing) plays protective action, and this covering rete for example can be made by CVL.
Certainly, although not shown in Fig. 1, in fact, usually can be respectively equipped with adhesive layer at two-layer line layer 3,7 with insulating barrier 6, be used for line layer and insulating barrier are glued together.Therefore, under a lot of situations, this flexible circuit board structure of prior art is actually seven layers complicated structure.
The material of insulating barrier 6 has many kinds, and wherein the most commonly used is polytetrafluoroethylene, polyimides, polyester and PI (PI) material.Polyimide material has non-flammable, physical dimension is stable, has higher tensile strength, and the ability with the welding temperature of bearing, polyester is also referred to as PETG (being called for short PET), its physical property is similar to polyimides, have lower dielectric constant, the humidity of absorption is very little, but non-refractory.Polyester presents rigidity in cryogenic applications.These materials all can be used for forming insulating barrier.
In traditional prior art, generally all adopt Copper Foil as the line layer in the flexible circuit.It can adopt the mode of electro-deposition (ED), forging (RA).Copper Foil is the material with compliance, can be made into many kinds of thickness and width.The Copper Foil of forging also has the level and smooth characteristics of hard except having pliability, it is suitable for being applied among the occasion that requires dynamic deflection.
In the prior art, adoptable material is fine copper or copper alloy aborning at present, zinc yellow copper for example, and the thickness of Copper Foil is more than the 10Z.If the employing fine copper, then the General Requirements of fine copper is T2 copper.The requirement of copper alloy is generally Tp2 or copper content more than 20%, and remaining composition can be zinc (Zn) or other trace additives.
Fig. 2 also is the partial section of the single-sided flexible circuit board of prior art, has shown the structure of the single-sided flexible circuit board of prior art, comprises copper foil circuit layer 8 and covers copper foil circuit layer 8 double- edged coverlay 5,5.
Although Fig. 1 of prior art and Fig. 2 do not show, those skilled in the art know, are exposed to solder joint (pad) in the air ambient what the copper foil circuit layer was provided with that some not coating epiphragmas cover, are used for welding electronic component and/or circuit.
Fig. 3 has shown the front schematic view of single or double flexible circuit board, has shown the coverlay 5 that has covered the copper foil circuit layer and solder joint 2 that the not coating epiphragma 5 that exposes covers.
The main design of flexible circuitry panel products of the present utility model and technique
According to the utility model, the solder joint (pad) that is exposed in the air ambient on the copper foil circuit layer of prior art is carried out the coating processing, apply in the above the coat of metal that one deck is difficult for oxidation and has good solderability.Like this, both can omit passivation process step of the prior art, and can provide superior solderability for wiring board again.
Exemplary technological process
The manufacturing process of flexible circuit board of the present utility model generally comprises main technological process and auxiliary process flow process.The general fabrication processing that those skilled in the art will appreciate that the flexible circuit board of prior art is known, does not therefore give unnecessary details one by one, and the main inventive concept of flexible circuit board of the present utility model concentrates in the processing of butt welding point.
Below in conjunction with single-sided flexible circuit board the utility model is described.
According to one preferably but do not have restrictive execution mode, the manufacture craft of single-sided flexible circuit board of the present utility model is as follows:
Wall scroll aluminum or aluminum alloy wire (for example flat conductor) is provided, and it will be as the line layer 8 of wiring board; Line layer is carried out cross cutting or die-cut, form a plurality of otch (for example otch shown in Figure 3), thereby form corresponding a plurality of part of path 8, so just between adjacent part of path 8, formed the disconnection of circuit.Like this, by between adjacent part of path 8 at pad locations burn-on LED and/or other components and parts, just can form the coupled in series of circuit; Stick reverse side coverlay 5 and carry out pressing at this finished reverse side with line layer of a plurality of part of paths 8; Be provided at the front coverlay 5 of windowing in pad 2 places, then at the positive contraposition applying front of line layer 8 coverlay 5 and carry out pressing, so just can obtain the single-sided flexible circuit board of exposed pad 2.
As mentioned above, substitute Copper Foil as wiring material layer with aluminium or aluminium alloy (or aluminium foil) as line material, not only can guarantee the satisfactory electrical conductivity of circuit, more crucial a bit is greatly to reduce the material cost of wiring board.For example, the material cost of aluminum wiring board will be the copper foil circuit plate 1/4th or even lower.
Certainly, those skilled in the art obviously are appreciated that and also can adopt other material to be used as the material of line layer, for example iron, steel etc., and these all belong to scope of the present utility model.
Certainly, those skilled in the art it is also understood that, also can not change the copper foil material of the line layer of traditional flexible circuit board, the coating of just improveing solderability with butt welding point processes to replace traditional Passivation Treatment, so also can realize the purpose of improving the solder joint solderability of the present utility model.These also all belong to scope of the present utility model.
The below introduces pad 2 is carried out the coating processing.
According to a preferred embodiment, after coverlay 5 is all sticked on line layer 8 two sides, the pad 2 deposition one deck nickel dams that exposing.The deposition of nickel dam can adopt the mode of plating or chemical plating.The preferred chemical nickel plating that adopts.With two sides for example shown in Figure 3 all stick surface (bond pad surface) that coverlay 5 only exposes the single-sided flexible circuit board of pad 2 carry out scrubbing except the wet goods preliminary treatment (if necessary, also may comprise activation processing), then be immersed in the chemical nickel-plating solution under the working temperature (for example 90 about degree) and reach a period of time, plate nickel dam at pad 2.The technique of these electronickellings or chemical nickel plating all is conventional process techniques, is known to those skilled in the art, therefore gives unnecessary details no longer one by one.Because nickel has very good non-oxidizability and solderability, therefore after nickel plating, just can obtain non-oxidizability and solderability and all obtain the pad 2 improved, thereby obtain the improved flexible circuit board of solderability.
According to another preferred embodiment, also can be after coverlay 5 be sticked at the back side of line layer 8, the wiring board that face exposure is gone out whole line layer 8 immerses in the chemical nickel-plating solution whole line layer is carried out nickel plating, then take out, the coverlay of windowing is in advance sticked in the positive contraposition of wiring board after nickel plating, like this, also has nickel coating on the pad 2 that exposes.
According to another preferred embodiment, also can directly replace coverlay 5 with the mode of printing welding resistance printing ink.That is, after line layer 8 two-face printing welding resistance printing ink, plate nickel dam at the pad 2 that exposes.Perhaps, behind the back up welding resistance printing ink of line layer 8, the wiring board that face exposure is gone out whole line layer 8 immerses in the chemical nickel-plating solution whole line layer is carried out nickel plating, and then the positive printing of the wiring board after nickel plating welding resistance printing ink, so that also have nickel coating on the positive pad 2 that exposes.
Afterwards, as required, carry out conventional baking-silk-screen-electrical measurement-anti-oxidation-profile-FQC-packing-shipment etc. operation, just can obtain single-sided flexible circuit board of the present utility model.
Certainly, according to general inventive concept of the present utility model, those skilled in the art obviously are appreciated that, coating material on the solder joint 2 also can be selected other material, for example except being the nickel metal, nickel alloy, silver, zinc, tin, perhaps their combination, etc.This coating also can be composite deposite, first copper plate nickel coating then for example, and perhaps first zinc-plated then nickel coating, etc.
According to another preferred embodiment, in order to reach the effect that reduces material cost, also can adopt aluminium as line layer, the combination of plated with copper layer or plated with copper nickel composite deposite on the aluminium solder joint.Can realize reducing dramatically like this purpose of material cost and production cost.
According to another preferred embodiment, the thickness of the utility model line layer is preferably the 50-500 micron in the scope of 10-1000 micron, more preferably at the 100-200 micron.
This structure of the present utility model and manufacture craft are improved solderability and non-oxidizability so that can greatly reduce material cost and production cost, improve reliability and conductivity.
According to a preferred embodiment of the present utility model, the components and parts that mount or carry at flexible circuitry panel products of the present utility model can comprise all kinds of LED and resistance.For example, the model of preferred LED can comprise: 335,3528,5050,5060, etc.The model of preferred resistance can comprise as follows: 0603,0805,0812, etc.
Obviously, this area designer is appreciated that fully that according to different application scenarios and customer requirement flexible circuitry panel products of the present utility model can comprise various types of LED, resistance and other components and parts etc.
Above by the agency of specific embodiment of the utility model.Yet should be appreciated that under the prerequisite that does not break away from spirit and scope of the present utility model, can carry out various modifications.Therefore, other embodiment also belongs to the protection range of claim of the present utility model.Therefore the utility model is not limited to disclosed the drawings and specific embodiments, and scope of the present utility model is limited by claim.
Claims (10)
1. flexible circuit board with solderability of improvement comprises:
The metallic circuit layer, described metallic circuit layer is provided with solder joint;
Cover on the described metallic circuit layer but do not cover coverlay or the welding resistance printing ink of described solder joint,
It is characterized in that:
Described solder joint is provided with the coat of metal.
2. flexible circuit board according to claim 1 is characterized in that, described metallic circuit layer is the aluminum or aluminum alloy line layer.
3. flexible circuit board according to claim 2 is characterized in that, described metallic circuit layer is aluminium foil layer, alloy foil layer, aluminium alloy conductor layer or aluminum conductor layer.
4. flexible circuit board according to claim 1 is characterized in that, described metallic circuit layer is copper foil layer, copper alloy foil layer, copper alloy wire layer, copper conductor layer, aluminium nickel coat, copper-clad nickel dam, iron layer or steel layer.
5. each described flexible circuit board is characterized in that according to claim 1-4, and the described coat of metal is nickel coating, nickel plating alloy layer, silver coating, zinc coat or tin coating.
6. flexible circuit board according to claim 5 is characterized in that:
Described metallic circuit layer is the aluminum or aluminum alloy line layer, and the described coat of metal is chemical Ni-plating layer; Perhaps
Described metallic circuit layer is copper or copper alloy circuit layer, and the described coat of metal is chemical Ni-plating layer.
7. each described flexible circuit board is characterized in that according to claim 1-4, and the described coat of metal is composite deposite.
8. flexible circuit board according to claim 7 is characterized in that, described composite deposite is copper facing internal layer and the outer field combination of nickel plating, or zinc-plated internal layer and the outer field combination of nickel plating.
9. each described flexible circuit board is characterized in that according to claim 1-4, and the thickness of described metallic circuit layer is the 10-1000 micron.
10. LED lamp band, it comprises according to each described flexible circuit board in the claims, and is welded on the LED on the described solder joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202792266U CN202799390U (en) | 2012-06-13 | 2012-06-13 | Flexible circuit board with improved weldability and LED strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202792266U CN202799390U (en) | 2012-06-13 | 2012-06-13 | Flexible circuit board with improved weldability and LED strip |
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| Publication Number | Publication Date |
|---|---|
| CN202799390U true CN202799390U (en) | 2013-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012202792266U Expired - Fee Related CN202799390U (en) | 2012-06-13 | 2012-06-13 | Flexible circuit board with improved weldability and LED strip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711375A (en) * | 2012-06-13 | 2012-10-03 | 田茂福 | Flexible circuit board with improved weldability and manufacture method |
| CN108914123A (en) * | 2018-07-27 | 2018-11-30 | 苏州瑞沁精密机械有限公司 | A kind of metal parts surface anti-corrosion treatment method |
-
2012
- 2012-06-13 CN CN2012202792266U patent/CN202799390U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711375A (en) * | 2012-06-13 | 2012-10-03 | 田茂福 | Flexible circuit board with improved weldability and manufacture method |
| CN108914123A (en) * | 2018-07-27 | 2018-11-30 | 苏州瑞沁精密机械有限公司 | A kind of metal parts surface anti-corrosion treatment method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Tian Maofu Document name: Notification of Termination of Patent Right |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20130613 |