CN202168268U - Printed circuit board capable of improving heat dissipation effect - Google Patents
Printed circuit board capable of improving heat dissipation effect Download PDFInfo
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- CN202168268U CN202168268U CN2011201471653U CN201120147165U CN202168268U CN 202168268 U CN202168268 U CN 202168268U CN 2011201471653 U CN2011201471653 U CN 2011201471653U CN 201120147165 U CN201120147165 U CN 201120147165U CN 202168268 U CN202168268 U CN 202168268U
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- wiring board
- printed wiring
- metal derby
- room
- radiating effect
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Abstract
The utility model relates to a printed circuit board capable of improving heat dissipation effect. A metal block is wedged and penetrates through the printed circuit board, and due to the high heat conducting performance of the metal block, the printed circuit board is provided with high heat conducting performance. By adopting the metal block, the heat dissipation effect can be greatly improved with very low cost.
Description
Technical field
Usually can have some high-power components and parts in the electronic products, in the course of the work, cause the electronic products local overheating thereby these components and parts can send great amount of heat, the design that improves heat radiation also emerges in an endless stream.Improving radiating effect through printed wiring board is a kind of novel design.
Background technology
Usually can there be some high-power components and parts in the electronic products; In the course of the work; Thereby these components and parts can send great amount of heat causes the electronic products local overheating, and improving radiating effect through printed wiring board is a kind of novel design, and its basic principle is that heat is conducted to opposite side and dissipates from a side of printed wiring board; Traditional method has the via that is coated with copper that adopts array to arrange to increase radiating effect; Increase but thereby such design can cause the printed wiring board area to increase cost, and can't satisfy higher heat radiation power design, need the design of more optimizing and to satisfy design requirement.
Summary of the invention
The technical problem that the present invention solves is: a kind of printed wiring board that improves radiating effect is provided; It is characterized in that; In the room of printed wiring board, fill in the metal derby that runs through printed wiring board, the shape and size of metal derby and the shape and size in the room on the printed wiring board are close, after metal derby is filled in the room; Formation cooperates more closely and is difficult for dropping out, and utilizes the high-termal conductivity of metal derby to make printed wiring board also have high thermal conductivity.
Further technical scheme of the present invention is: the shape in the metal derby and the room of on printed wiring board, digging out is cylindrical.
Further technical scheme of the present invention is: the size of metal derby and between the size in the room of digging out on the printed wiring board, differing is no more than ± 0.20mm; The height of metal derby and the thickness of printed wiring board are close, and the thickness of the height of metal derby and printed wiring board differs and is no more than ± 0.20mm.
Further technical scheme of the present invention is: metal derby is a solid design; The striped that has concave channels and protrusion on the arc surface of metal derby; The striped of concave channels and protrusion alternately is distributed on the arc surface of metal derby; The direction of the concave channels that exists on the arc surface of metal derby and the striped of protrusion is for along axially the distributing of metal derby, and the striped of concave channels and protrusion is parallel each other.
Further technical scheme of the present invention is: the distance on the arc surface of metal derby between the top of the striped of two adjacent protrusions is between 0.1～1.0mm.
Further technical scheme of the present invention is: the distance between the top of the striped of the protrusion that exists on the bottommost of the concave channels that exists on the arc surface of metal derby and the arc surface of metal derby is between 0.1～1.0mm.
The technical problem that the present invention solves is: a kind of printed wiring board that improves radiating effect is provided; It is characterized in that; In the room of printed wiring board, fill in the metal derby that runs through printed wiring board, the shape and size of metal derby and the shape and size in the room on the printed wiring board are close, after metal derby is filled in the room; Formation cooperates more closely and is difficult for dropping out; Utilize the high-termal conductivity of metal derby to make printed wiring board also have high thermal conductivity, for accomplishing the printed wiring board of in the room, filling in metal derby, it is as a whole to make that by the minimum layer of metal layer that plates metal derby and printed wiring board connect into.
Further technical scheme of the present invention is: a kind of printed wiring board that improves radiating effect is provided, it is characterized in that, connect metal derby and become as a whole metal layer thickness to be controlled between 1 to 10 micron with printed wiring board.
The effect that the present invention obtains is: the printed wiring board that adopts present technique to make, and the radiating effect that under very little cost price, just can obtain improves greatly, and technical merit is greatly improved.
Fig. 1 is the side sectional view that is plugged with the printed wiring board of metal derby.
Fig. 2 is the vertical view that is plugged with the printed wiring board of metal derby.
Fig. 3 is side sectional view and the size marking situation that is plugged with the printed wiring board of metal derby.
Description of drawings
Fig. 4 is the diagrammatic sketch of the required minimum flow process of the printed wiring board of making high radiating effect.
Fig. 5 is the vertical view of the metal derby of heat transmission.
Fig. 6 is the end view of the metal derby of heat transmission.
Fig. 7 is a vertical view of having filled in the printed wiring board of the metal derby that has the tongue and groove design.
Below in conjunction with the practical implementation example, technical scheme of the present invention is further specified.
Printed wiring board is to be made up of line layer and dielectric layer, and line layer normally is made up of metal, and like the copper metal, these layers are the characteristics with conduction and heat conduction.And dielectric layer normally is made up of materials such as resin, inserts, glass fibers, and these materials have the insulation property of electricity, and heat conductivility is also very poor.So printed wiring board does not possess very strong thermal conduction characteristic usually; For the big electronic product of caloric value; Need extra increase heat abstractor or equipment can satisfy the heat dissipation design requirement of product; But such design can make that the volume super large of electronic product is individual, neither is convenient for carrying, and cost also can be very high.And the metal species material all has very good thermal conduction characteristic, utilizes this specific character of metal derby just can design the printed wiring board of high heat dispersion.And copper and aluminum metal all have good thermal conduction characteristic, and obtain easily, can not increase expensive cost.
Embodiment of the present invention is: a kind of printed wiring board that improves radiating effect is provided, it is characterized in that, in printed wiring board, fill in the metal derby that runs through printed wiring board, utilize the high-termal conductivity of metal to make printed wiring board have high thermal conductivity.As shown in Figure 1,1 expression printed wiring board, the metal derby that 2 expressions are filled in.The metal derby of being filled in is minimum metal or its alloy that comprises the composition of copper, also can adopt aluminium or its alloy as the metal derby of filling in.Because copper and aluminium all have good heat-conducting, can distribute the heat in the printed wiring board well.
Embodiment
Be convenient processing, it is minimum that the shape in the metal derby and the room of on printed wiring board, digging out is cylindrical, such processing cost, and method is also the simplest.Combine from Fig. 1 (side sectional view) and Fig. 2 (vertical view) and to see, just can be clear that very much the design's principle.Certainly the shaped design in the metal derby and the room of on printed wiring board, digging out is become shapes such as other shape such as cube, oval solid figure, triangle solid figure, polygon solid figure also can satisfy to improve heat dissipation design to require, but processing cost can rise greatly.
The shape of metal derby and size are all approaching with the shape and the size in the room of on printed wiring board, digging out, and after metal derby is filled in the room, form cooperation closely and can not drop out.The size of metal derby and between the size in the room of digging out on the printed wiring board, differing is no more than ± 0.20mm.The height of metal derby and the thickness of printed wiring board are close, and the thickness of the height of metal derby and printed wiring board differs and is no more than ± 0.20mm.From shown in Figure 3, a representes the thickness of printed wiring board, and b representes the height of metal derby; C representes the size of metal derby, and the size in the room that d representes to dig out on the printed wiring board is according to design; Differ between a and the b and be no more than ± 0.20mm, differ between c and the d and be no more than ± 0.20mm.Usually, the height of the metal derby of being filled in is designed to not exceed the thickness of printed wiring board, and after installing like this, metal derby just can not protrude, and is beneficial to the installation of follow-up other electronic devices and components.
The design of metal derby: specifically as shown in Figure 5; Being shaped as of metal derby is cylindrical; And be solid design; Have the striped (shown in 3 among Fig. 5 and Fig. 6) of concave channels (shown in 4 among Fig. 5 and Fig. 6) and protrusion on the arc surface of metal derby, the striped of concave channels and protrusion alternately is distributed on the arc surface of metal derby, and the direction of the concave channels that exists on the arc surface of metal derby and the striped of protrusion is axially distributing along metal derby; And the striped of concave channels and protrusion is parallel each other, and the distance (shown in the g among Fig. 5) between the top of the striped of two adjacent protrusions is between 0.1～1.0mm.Distance (shown in the f among Fig. 5) between the top of the striped of the protrusion that exists on the bottommost of the concave channels that exists on the arc surface of metal derby and the arc surface of metal derby is between 0.1～1.0mm.The concave channels that exists on the arc surface of metal derby is " V " font, is designed to other shapes certainly also be fine, and be that to practice thrift cost most simultaneously also be the simplest processing mode but be designed to the V font; It is that the mode of carrying out roll extrusion on the surface that has the cylindrical metal piece on the smooth face of cylinder originally extrudes the striped with concaveconvex shape; If adopt other design, such as, if stripe design is become nonlinear; At this moment striped can very bad processing; Need the direction and the angle of conversion pinch roller during roll extrusion, processing is got up can be very difficult, and cost is also higher.Concave channels cross section angulation (shown in the e among Fig. 5) is between 60 °～120 °.The two ends need chamfering of columniform metal derby (shown in 5 among Fig. 5, and shown in 5 among Fig. 6), be beneficial to metal derby and fill in the printed wiring board.
Embodiment of the present invention is: a kind of printed wiring board that improves radiating effect is provided; It is characterized in that technology is minimum comprises following making step for this: the inwall that on printed wiring board, digs out the room in room → dug out metallizes → metal derby is filled in the room.The inwall in the room of on printed wiring board, dig out the room, being dug out metallizes, metal derby is filled in these several making steps of room is to improve radiating effect and necessary step; And for the production of printed wiring board; The step that possibly also need other, these steps can be arranged in respectively between above-mentioned several production stages, in the actual production printed wiring board process; Printed wiring board itself has self required step or flow process manufactured; And different printed wiring boards, it makes flow process or step has nothing in common with each other, and has just provided herein to improving some necessary making steps of radiating effect; Combine for improving necessary some making steps and the necessary making step of printed wiring board self of radiating effect, just can design the making step of the printed wiring board that can improve radiating effect.Even increase some steps, but these all belong in the claim scope of this patent.As shown in Figure 4 for improving some necessary making steps of radiating effect, the implementation method in concrete per step is following:
Step 100: digging out the room on the printed wiring board: in the production at printed wiring board, its prevailing multiple-plate production procedure is: open the inspection of material → internal layer graphic making → internal layer and repair → be pressed into multi-layer sheet → boring → remove the heavy copper → electric plating of whole board of glue → outer graphics transfer → graphic plating → outer etching → skin to check and repairing → resistance weldering → moulding → electrical testing → packed products.Above-mentioned production procedure has just provided maximum making step, in each step, also has a lot of corresponding substeps, and these substeps are that auxiliary key step realizes.In " boring " step; Need processing such as gong limit, x-ray punching, edging before the boring; Also need play shop bolt, rubberizing paper before the boring of last rig, do processing such as first plate test boring, just begin boring in batches afterwards, can not think that adding behind these substeps is exactly a kind of innovation." digging out the room on the printed wiring board " step is carried out in the step in boring, carries out before can it being placed on the boring step, carries out after also can it being placed on the boring step, also can hole and " on printed wiring board, digging out the room " carries out simultaneously." on printed wiring board, dig out the room " and can adopt the mode that cutter bores of boring, what boring came like this is the eyelet of a circle, if required hole is bigger; There is not corresponding wammel cutter; Can use less brill cutter repeatedly to bore different positions, corresponding macropore is come outbreak out, like this can be cumbersome.If the room of shape between appointing also can adopt the mode that repeatedly enlarges than the bradawl cutter to be made with such method.But simpler method is the mode that adopts milling cutter to mill; Milling cutter is milled a circle to get final product along the periphery of the shape in required room of being processed into; If there is burr, can be again with newer milling cutter again pricker once adopt after perhaps the mode of polishing to remove deburring and also can.The room of being dug out can be one, also can be a plurality of.
Step 200: the inwall in the room of being dug out metallizes: its purpose is exactly the metal level that the inwall covering last layer in the room of being dug out links together, so that heat-conducting effect is better, makes things convenient for the carrying out of follow-up processing simultaneously.Accomplished after digging out the room on the printed wiring board, the inwall of region, room does not have successional metal to couple together, and need the inwall in the room of being dug out be metallized.Metallized process comprises except that glue processing, conductionization processing usually, electroplates the thickening treatment and other steps, and is specific as follows:
Removing glue handles: after having accomplished the described machining operation of step 100, the inwall in the room of being dug out can exist some pollutants or foreign material usually, could guarantee the reliability of printed wiring board after need removing.Removing gluing method has chemistry to remove glue, plasma to remove glue or chemistry and remove glue and remove with plasma that glue mixes and the mode of usefulness, and its purpose is exactly that the pollutant or the foreign material of the inwall existence in the room of being dug out are stung eating away.Accomplish the printed wiring board that removes after glue is handled; When particularly adopting chemistry to remove adhesive means; The surface of printed wiring board can be stained with relevant chemicals, needs cleaning and removing, so also need increase the corresponding cleaning operation; Matting can be to reach together more than one, till printed wiring board is cleaned totally.These mattings can be removed the glue process design in same production line with chemistry usually, so just can disposablely accomplish.So relevant all process steps can be referred to as except that the glue processing;
Conductionization processing: its objective is to deposit the coating that last layer can conduct electricity, so that follow-up plating thickening treatment step is achieved to having accomplished the printed wiring board that removes the glue processing.The mode of conductionization processing is more; Electroless copper plating method, black hole method (carbon black method) etc. are arranged; Which kind of mode no matter the conductionization processing adopt realize; All be than the complex processing flow process, wherein comprise relevant chemical treating process and cleaning process, treatment process may several steps of as many as or even the dozens of step could accomplish this conductionization processing.Though this process is complicated; But its basic principle is the same; Exactly on the printed wiring board surface and the long-pending last layer of the inner hole deposition material that can conduct electricity; This material that can conduct electricity can play the effect of opening plating in follow-up electroplating work procedure, do not have certain thickness metal thereby will there be the position of metal level to plate one deck originally;
Electroplating thickening handles: its purpose is exactly the desired location of the printed wiring board of having accomplished the conductionization processing to be plated one deck have certain thickness metal; This metal is the copper metal normally; After having accomplished this step, just can obtain favorable conductive or heat conductivility between the circuit of printed wiring board.Electroplating the thickening process also is a very complex processing process; Different product has different handling processes; The method production of the disposable plating of the employing that has thickening, the employing that also has elder generation electric plating of whole board are tentatively thickeied, are made line pattern, carry out the method production of graphic plating secondary thickening more afterwards.Wherein comprise relevant chemical treating process and cleaning process, treatment process may several steps of as many as or even the dozens of step could accomplish this conductionization processing.Though this process is complicated; But its basic principle is the same; Exactly on the printed wiring board surface or hole inwall deposition last layer can satisfy the material that can conduct electricity of design thickness requirement; The thickness of this layer conductive materials usually design between 10 to 50 microns, also have need than 50 microns thicker, such Thickness Design is all in this claim scope.
In fact, the production procedure of printed wiring board is also will be far away more complicated than above-mentioned, has accomplished and has electroplated after thickening handles, and also need make the figure and the circuit of printed wiring board, and the graphic designs of different printed wiring boards is different, and its manufacture method and process also are not quite similar.After above-mentioned plating thickening is handled, also need carry out figure transfer and make, accomplished figure transfer after, carry out the copper facing thickening and the zinc-plated processing of graphic plating, take off film, etching afterwards, take off tin.After the printed wiring board that also has has been accomplished figure transfer; Be to adopt the electronickelling gold to handle; If the thickness of gold is that requirement is thicker (as greater than 0.05 micron), also need thick metal plated processing, if the part adds the thick gold of plating; Before the thick gold of plating, also need do the secondary figure transfer, the position that need not plate thick gold covered up carry out the thick gold of parcel plating again.
Step 300: metal derby is filled in the room: to having accomplished after the above-mentioned processing after " inwall in the room of being dug out metallizes ", as exist circuit to make, also need the figure and the circuit of printed wiring board be made.Make the resistance weldering if desired; Also needing to hinder the weldering step accomplishes; Resistance weldering step has comprised a series of substep: cleaning surfaces, oven dry, silk-screen, preliminary drying, exposure, development, visual examination, back baking or the like, if need twice resistance weldering to make, said process also need repeat once again; If there is jack process, need add the consent flow process, consent can also be divided into filling holes with resin, resistance weldering consent, copper slurry consent, silver slurry consent, carbon oil consent or the like, adopts the material different consent, makes flow process and being not quite similar with requiring.Afterwards, need metal derby is filled in empty place, can the high design function that dispels the heat with realization.
In the printed wiring board production process of reality, before above-mentioned described step 100, also have a lot of making steps; Between step 100 and step 200, between step 200 and step 300, and after step 300, all can increase a lot of other making steps, to accomplish the necessary making flow process of printed wiring board.The production technology of printed wiring board and flow process are multifarious in a word; Require each different; And these various flow processs can only belong to for realizing that certain function or purpose design; They can become an independently claim, but can not think added these unique flow processs after, be a kind of innovation that this claim is done.
Embodiment of the present invention is: for accomplishing the printed wiring board of in the room, filling in metal derby, plate minimum layer of metal layer.After in the room of printed wiring board, filling in metal derby; Be that physical property contacts between printed wiring board and the metal derby; Really be not linked to be an integral body, though the cooperation between them is tightr, when the time spent of doing that metal derby receives external force; Still can be extruded or drop out, so just influenced the product whole reliability.For accomplishing the printed wiring board of in the room, filling in metal derby, plate minimum layer of metal layer, just can avoid occurring the integrity problem that separates so that the metal level that metal derby and printed wiring board are newly plated connects into as a wholely.The metal level that is plated is minimum to be one deck, certainly is multilayer, can be with a kind of metal ingredient between the different layers; Also can be the different metallic composition, such as, earlier with the very thin palladium of chemical method deposition last layer; Adopt palladium to plate one deck nickel again as catalyst; Plating one deck gold layer is perhaps replaced last layer gold layer on the basis of nickel again, so both can play interconnect function, and the gold layer also can play effect attractive in appearance and anticorrosion and oxidation.Can comprise other elements in the nickel dam; Thereby what plated is one deck nickel alloy layer; As contain a certain amount of P elements (approximately being controlled between the percentage by weight of 6%-18%); The alloy that perhaps contains a kind of or mixing in the metals such as certain cobalt element, chromium element, but Main Ingredients and Appearance adopts nickel.The metal layer thickness that wherein comprises nickel element is controlled between 1 to 10 micron; Thereby the metal level that comprises nickel element can disposable plating become one deck; Also can plate several times, lead metal level more, but final thickness still is controlled between 1 to 10 micron thereby become.These coating are not limited to and adopt the metal material that comprises nickel; It also can be the mixture that adopts copper, tin or several metal; Also can be plating multilayer coating and adopt the different metallic material between the different coating, as long as these metal materials can be just passable with coupling together between metal derby and the printed wiring board.Through this metal level that newly plates, just can be so that metal derby and printed wiring board connect into as a whole.In conjunction with " design of metal derby " recited above: being shaped as of metal derby is cylindrical; And be solid design; Have the striped (shown in 3 among Fig. 5 and Fig. 6) of concave channels (shown in 4 among Fig. 5 and Fig. 6) and protrusion on the arc surface of metal derby, the striped of concave channels and protrusion alternately is distributed on the arc surface of metal derby, and the direction of the concave channels that exists on the arc surface of metal derby and the striped of protrusion is axially distributing along metal derby; And the striped of concave channels and protrusion is parallel each other; These designs are in order to make metal derby and to combine with printed wiring board better and designing, and are specifically as shown in Figure 7, adopt such design; After metal derby 2 is tucked in the printed wiring board 1; Produce because the existence of tongue and groove can cause that many rooms are arranged (shown in 8 among Fig. 7), the circulation of liquid medicine can have been strengthened so that liquid medicine can enter into the sidewall of metal derby and the sidewall of printed wiring board empty place in plating on the one hand in these rooms; Can strengthen the metal level that newly plates and the contact area between metal derby and the printed wiring board on the other hand, make adhesion more strengthen.
For accomplishing the printed wiring board of in the room, filling in metal derby, the surface of adopting heavy nickel to soak gold is comprehended more convenient simple.Adopt heavy nickel to soak the surface treatment of gold, have certain thickness nickel dam, just can couple together into two parts of printed wiring board and metal derby as a whole through nickel dam at relevant position deposition last layer.The THICKNESS CONTROL of nickel dam is between 1 to 10 micron.The main processing flow process that heavy nickel soaks gold has: surface degreasing and cleaning → little erosion and cleaning → preimpregnation → activation processing and cleaning → heavy nickel is handled and is cleaned → soak gold and handles and clean; Because gold is valuable metal; After soaking the gold processing; Tend to increase the processing action that gold reclaims, reduce pollution simultaneously to practice thrift cost.
Certainly, for accomplishing the printed wiring board of in the room, filling in metal derby, the surface treatment mode that adopts other also is feasible, like spray tin, heavy tin, heavy silver, organic coat etc.Spray tin has another name called hot air leveling, is the printed wiring board after handling through scaling powders such as preimpregnation rosin to be immersed in gone in the scolder of high temperature melting, adopts the gas of HTHP that scolder is blown flat method afterwards.Heavy tin then is earlier printed wiring board to be carried out cleaning surfaces to handle, and adopts the method for chemically treated method deposition last layer tin in the position of needs afterwards.The principle of heavy silver is similar with heavy tin, and just the material of deposition has become silver.Organic coat then is earlier printed wiring board to be carried out cleaning surfaces to handle, afterwards on the printed wiring board surface or required position apply the organic substance coating that last layer can be prevented oxidation and can help the raising welding performance.
Above content is to combine concrete preferred implementation to the further explain that the present invention did, and can not assert that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to protection scope of the present invention.
Claims (8)
1. printed wiring board that can improve radiating effect; It is characterized in that; In the room of described printed wiring board, fill in the metal derby that runs through printed wiring board, the shape and size in the room on the shape and size of described metal derby and the described printed wiring board are close.
2. a kind of printed wiring board that improves radiating effect according to claim 1 is characterized in that, the shape in the described metal derby and the room of on described printed wiring board, digging out is cylindrical.
3. a kind of printed wiring board that improves radiating effect according to claim 1 is characterized in that, the size of described metal derby and between the size in the room of digging out on the described printed wiring board, differing is no more than ± 0.20mm; The height of described metal derby and the thickness of described printed wiring board are close, and the thickness of the height of metal derby and printed wiring board differs and is no more than ± 0.20mm.
4. a kind of printed wiring board that improves radiating effect according to claim 2; It is characterized in that; Described metal derby is a solid design, has the striped of concave channels and protrusion on the arc surface of described metal derby, and the striped of described concave channels and protrusion alternately is distributed on the arc surface of described metal derby; The direction of the striped of described concave channels and protrusion is for along axially the distributing of metal derby, and the striped of described concave channels and protrusion is parallel each other.
5. a kind of printed wiring board that improves radiating effect according to claim 4 is characterized in that, the distance on the arc surface of described metal derby between the top of the striped of two adjacent described protrusions is between 0.1～1.0mm.
6. a kind of printed wiring board that improves radiating effect according to claim 4; It is characterized in that the distance between the top of the bottommost of the described concave channels that exists on the arc surface of described metal derby and the striped of described protrusion is between 0.1～1.0mm.
7. printed wiring board that can improve radiating effect; It is characterized in that; In the room of printed wiring board, fill in the metal derby that runs through printed wiring board; The shape and size of metal derby and the shape and size in the room on the printed wiring board are close, and for accomplishing the described printed wiring board of in the room, filling in said metal derby, make described metal derby and described printed wiring board connect into as a whole by the minimum layer of metal layer that plates.
8. a kind of printed wiring board that improves radiating effect according to claim 7 is characterized in that described metal layer thickness is controlled between 1 to 10 micron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201471653U CN202168268U (en) | 2011-05-09 | 2011-05-09 | Printed circuit board capable of improving heat dissipation effect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201471653U CN202168268U (en) | 2011-05-09 | 2011-05-09 | Printed circuit board capable of improving heat dissipation effect |
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| CN202168268U true CN202168268U (en) | 2012-03-14 |
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| CN2011201471653U Expired - Fee Related CN202168268U (en) | 2011-05-09 | 2011-05-09 | Printed circuit board capable of improving heat dissipation effect |
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2011
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Granted publication date: 20120314 Termination date: 20130509 |