CN101790285A - Communication device and method for manufacturing circuit board of communication device - Google Patents
Communication device and method for manufacturing circuit board of communication device Download PDFInfo
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- CN101790285A CN101790285A CN200910139198A CN200910139198A CN101790285A CN 101790285 A CN101790285 A CN 101790285A CN 200910139198 A CN200910139198 A CN 200910139198A CN 200910139198 A CN200910139198 A CN 200910139198A CN 101790285 A CN101790285 A CN 101790285A
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Abstract
The invention relates to a method for manufacturing a circuit board of a communication device, which comprises the following steps: (a) arranging a barrier layer on a compressing surface of each daughter board with a through hole; and (b) carrying out lamination by using a bonding sheet as a binding between the daughter boards provided with the barrier layers. The embodiment of the invention also discloses the communication device, which comprises at least one circuit board, wherein the circuit board comprises more than two daughter boards with the through holes; each daughter board is provided with the compressing surface; the compressing surfaces of the two daughter boards are laminated by using the bong sheet; the compressing surfaces of the two daughter boards are respectively provided with the barrier layer; and the barrier layers on the two daughter boards are respectively combined with the two sides of the bonding sheet. The communication device and the method for manufacturing the circuit board of the communication device, which are provided by the embodiment of the invention, can effectively solve the problem that the resin gummosis enters the hole and has simple and convenient operation.
Description
Technical field
The present invention relates to the electronic communication field, the manufacture method of particularly relevant a kind of communication equipment and circuit board thereof.
Background technology
Circuit board (PCB:Printed Circuit Board) generally includes a plurality of daughter boards, adopts bonding sheet [PP:Prepreg is the resin (claiming B-Stage) of semi-cured state, and bonding sheet also can be described as prepreg] pressing bonding between a plurality of daughter boards.Some buried via holes of the last meeting of PCB moulding, blind hole and through hole.Wherein through hole runs through PCB top and bottom, can see from the PCB outward appearance.Buried via hole blind hole and through hole are different.Buried via hole is meant the hole of a kind of PCB of being embedded in inside, and the two ends in hole are all sealed, and can not see from the PCB outward appearance.Blind hole is meant that an a kind of end opens the hole that is positioned at PCB inside at PCB surface, the other end, and these blind holes are seen a part from the PCB external energy.Connector pinout can be gone up to insert corresponding two sides blind hole or the through hole and assemble from PCB, to realize PCB and outside being electrically connected.
The inventor finds that there is following shortcoming at least in prior art in realizing process of the present invention:
Because connector pinout has certain-length, therefore the resin gummosis that requires bonding sheet is not preferably in the run-in-hole, but the manufacturing process of being subject to, inevitably having the resin flow solation in these holes comes in, if too much, surpassed the height of regulation permission in the resin gummosis ostium, will make that the height in the connector pinout patchhole can be by the resin flow rubber cushion height after also solidifying in these run-in-holes, thereby cause the interference of connector pin and contact pin, influence the assembling of connector.
Summary of the invention
One embodiment of the present invention technical problem to be solved provides the manufacture method of a kind of communication equipment and circuit board thereof, can solve the problem that the resin gummosis enters the hole effectively, and is easy and simple to handle.
One embodiment of the present invention provides a kind of manufacture method of circuit board of communication equipment, comprises the steps:
A) the daughter board with through hole to pressing the surface that the barrier layer is set;
B) will be provided with between the daughter board on barrier layer and carry out pressing as binding by bonding sheet.
One embodiment of the present invention provides a kind of communication equipment, comprise at least one circuit board, described circuit board includes plural daughter board with through hole, daughter board has pressing the surface, carry out pressing to pressing between the surface by bonding sheet at two daughter boards, described two daughter boards be respectively equipped with the barrier layer on the surface to pressing, the barrier layer on these two daughter boards combines with the two sides of this bonding sheet respectively.
According to such scheme, the present invention is significant with respect to the effect of prior art: the manufacture method of the circuit board of the communication equipment that embodiment of the present invention provides, the daughter board with through hole to pressing the surface that the barrier layer is set, therefore can stop the resin gummosis to enter the hole effectively, simple to operate.The communication equipment that embodiment of the present invention provides, its circuit board is respectively equipped with the barrier layer two daughter boards to pressing on the surface, thereby can intercept in the resin flow glue run-in-hole of bonding sheet.
Description of drawings
Fig. 1 is the flow chart of the manufacture method of embodiment of the present invention 1.
Fig. 2 is the schematic diagram of the circuit board made by the manufacture method of embodiment of the present invention 1.
Fig. 3 is the flow chart of the manufacture method of embodiment of the present invention 2.
Fig. 4 is the flow chart of the manufacture method of embodiment of the present invention 3.
Fig. 5 is the flow chart of the manufacture method of embodiment of the present invention 4.
Embodiment
As shown in Figure 1, one embodiment of the present invention provides a kind of manufacture method of circuit board of communication equipment, comprises the steps:
A) make daughter board 1, on daughter board 1, form through hole 11 and pressing surface 12 (thereby docking and compress the surface that a plurality of daughter boards are linked together with binding) to pressing the surface to be meant to be used for; Daughter board 1 is made up of at least one core material, wherein, have at daughter board under the situation of a plurality of core materials, a plurality of core materials press together, filled media layer between the adjacent inner layer central layer, the outside at a plurality of core materials can further include graph layer, is filled with dielectric layer between described graph layer and the core material;
B) the daughter board 1 with through hole 11 to pressing the surface barrier layer 2 to be set on 12, barrier layer 2 can be arranged on wholely to pressing on the surface 12, perhaps barrier layer 2 only covers the position, aperture of the through hole 11 of daughter board 11.For example select a kind of barrier film (cover layer) as barrier layer 2, barrier film also claims coverlay, barrier film can comprise the resin bed 22 that is coated with adhesive-layer 21, the resin bed 22 here can comprise polyimide layer, here the adhesive-layer 21 as binding agent can comprise modified epoxy or acrylic resin, and the step that barrier layer 2 is set comprises: with the adhesive-layer 21 of barrier film be bonded in daughter board 1 whole to pressing on the surface 12 or the position, aperture of through hole 11 and barrier film is bonded on the daughter board 1;
C) will be provided with between the daughter board 1 on barrier layer 2 and carry out pressing as binding, and specifically be included in two of two daughter boards 1 and carry out pressing between the resin bed 22 of pressing two barrier films on the surface 12 bonding sheet 3 being set by bonding sheet 3; Only cover the scheme of the position, aperture of through hole 11 for barrier layer 2, be two daughter boards 1 to the resin bed 22 of pressing the barrier film on the surface 12 and do not covered by resin bed 22 carry out pressing to pressing between the surface 12 by bonding sheet 3;
D) daughter board after the pressing is made into PCB.
In this execution mode of the present invention, barrier layer 2 can effectively stop bonding sheet 3 uncured preceding resin flow solations to advance the through hole 11 of daughter board 1, and select barrier film as barrier layer 2, can directly make the adhesive-layer 21 of barrier film be bonded in daughter board 1 to pressing on the surface 12, the energy collection is simple to operate, the lamination number of times is few, prevent repeatedly daughter board 1 distortion that lamination causes, prevent that effectively the resin gummosis from advancing function such as hole in one.
As shown in Figure 1, 2, the circuit board 100 of the communication equipment of producing according to this manufacture method, comprise plural daughter board 1 with through hole 11, daughter board 1 has pressing surface 12, two daughter boards 1 to pressing the surface to be respectively equipped with barrier layer 2 on 12, between the barrier layer 2 of two daughter boards 1 bonding sheet 3 is set, and carries out pressing, the barrier layer 2 on these two daughter boards 1 combines with two surfaces of bonding sheet 3 respectively; This barrier layer 2 can be distributed in whole to pressing surface 12 or only being distributed in pressing the position, aperture of surface 12 through hole 11, make barrier layer 2 bonding sheet 3 and daughter board 1 to press the surface 12 between, this barrier layer 2 can be a barrier film, barrier film generally includes the resin bed 22 that is coated with adhesive-layer 21, the adhesive-layer 21 of barrier film and daughter board 1 to pressing surface 12 bondings, this barrier layer 2 that constitutes by barrier film, can not only effectively stop bonding sheet 3 uncured preceding resin flow solations to advance in the through hole 11, the lamination number of times is reduced, the daughter board distortion that can prevent repeatedly lamination to cause, and simple to operate.
As shown in Figure 3, the concrete manufacturing step of PCB comprises:
A) make daughter board 1, on daughter board 1, form through hole 11 and pressing surface 12;
B) the daughter board 1 with through hole 11 to pressing the surface barrier layer 2 to be set on 12, barrier layer 2 can be arranged on whole to pressing on the surface 12 or barrier layer 2 only covers the position, aperture of the through hole 11 of daughter board 11, in the present embodiment, barrier layer 2 is a resin bed, the step that barrier layer 2 is set is whole to pressing on the surface 12 or brushing the resin bed 23 of a laminar flow regime in the position, aperture of through hole 11 at daughter board 1, then this resin bed 23 is cured and forms barrier layer 2, make this barrier layer 2 be bonded in daughter board 1 to pressing on the surface 12;
C) between through hole 11 apertures places has covered the barrier layer 2 of two daughter boards 1 on barrier layer 2, bonding sheet 3 is set, and carries out pressing by bonding sheet 3; Only cover the scheme of the position, aperture of through hole 11 for barrier layer 2, be two daughter boards 1 to press the resin bed 23 on the surface 12 and do not covered by resin bed 23 carry out pressing to pressing between the surface 12 by bonding sheet 3;
D) pressing is later daughter board is made as PCB.
In this execution mode of the present invention, select the resin bed 23 of brushing to solidify formation barrier layer 2, back, can effectively stop bonding sheet 3 uncured preceding resin flow solations to advance the blind hole interior (being the through hole 11 of daughter board 1) of PCB, and be cured as the resin material combination well of the bonding sheet 3 of the resin material on barrier layer 2 and pressing daughter board 1, guaranteed the binding ability of pcb board pressing.
Shown in Fig. 2,3, the circuit board 100 of the communication equipment of producing according to this manufacture method, comprise plural daughter board 1 with through hole 11, daughter board 1 has pressing surface 12, two daughter boards 1 to pressing the surface to be respectively equipped with barrier layer 2 on 12, carry out pressing by bonding sheet 3 between the barrier layer 2 of two daughter boards 1, the barrier layer 2 on these two daughter boards 1 combines with two surfaces of bonding sheet 3 respectively; This barrier layer 2 can be distributed in whole to pressing surface 12 or only covering the position, aperture of the through hole 11 of daughter board 11, makes barrier layer 2 at bonding sheet 3 with to pressing between the surface 12; This barrier layer 2 is made of the resin bed 23 that one deck solidifies, this barrier layer 2 that constitutes by resin bed 23, can not only effectively stop the resin flow solation of bonding sheet 3 before uncured to advance in the through hole 11, and the resin combination well of the resin that solidify on barrier layer 2 and the bonding sheet 3 of pressing daughter board 1 has guaranteed the binding ability of pcb board pressing.
As shown in Figure 4, the concrete manufacturing step of PCB comprises:
A) make daughter board 1, on daughter board 1, form through hole 11 and pressing surface 12;
B) the daughter board 1 with through hole 11 to pressing the surface barrier layer 2 to be set on 12, barrier layer 2 can be arranged on whole to pressing on the surface 12 or barrier layer 2 only covers the position, aperture of the through hole 11 of daughter board 11, in the present embodiment, described barrier layer 2 comprises bonding thin slice 24 and metal forming 25, it is whole to pressing surface 12 or in position, the aperture pressing one deck bonding thin slice 24 and the metal forming 25 of through hole 11 that the step that barrier layer 2 is set is included in daughter board 1, described bonding thin slice 24 is in metal forming 25 with to pressing between the surface 12, described metal forming 25 can comprise Copper Foil, or silver foil, or goldleaf, the thin slice 24 of waiting to bond tears metal forming 25 after solidifying cooling formation bonding thin layer 26;
C) superimposed tack coat 3 between the bonding thin layer 26 of two daughter boards 1 adopts bonding sheet 3 that two daughter boards 1 are carried out the lamination combination; Only covering the scheme of the position, aperture of through hole 11 for barrier layer 2, is to carry out pressing to pressing between the surface 12 by bonding sheet 3 to what press that bonding thin layer 26 on the surface 12 and not bonded thin layer 26 cover at two daughter boards 1;
D) pressing is later daughter board is made into PCB.
In this execution mode of the present invention, bonding thin layer 26 after selecting to solidify is as barrier layer 2, can effectively stop the resin flow solation of bonding sheet 3 before uncured to advance the through hole 11 of daughter board 1, and the tree of the bonding thin layer 26 that solidifies refers to that material can combine well with the resin material of bonding sheet 3, has guaranteed the binding ability of pcb board pressing.
Shown in Fig. 2,4, the circuit board 100 of the communication equipment of producing according to this manufacture method, comprise plural daughter board 1 with through hole 11, daughter board 1 has pressing surface 12, two daughter boards 1 to pressing the surface to be respectively equipped with barrier layer 2 on 12, adopt bonding sheet 3 to carry out pressing between the barrier layer 2 of two daughter boards 1, the barrier layer 2 on these two daughter boards 1 combines with the two sides of bonding sheet 3 respectively; This barrier layer 2 can be distributed in whole to pressing surface 12 or only being arranged on the position, aperture of the through hole 11 of daughter board 11, makes barrier layer 2 at bonding sheet 3 with to pressing between the surface 12; This barrier layer 2 is made of one deck bonding thin layer 26, bonding thin layer 26 is identical with the material of bonding sheet 3, but term " bonding thin layer 26 " is not restricted to the thickness of this layer, the thickness of this layer can be decided according to the requirement of whole PCB, having under the situation of thickness requirement, the thickness of bonding thin layer 26 can select with the thickness of bonding sheet 3 substantially quite or thinner.This barrier layer 2 that constitutes by bonding thin layer 26, can not only effectively stop bonding sheet 3 uncured preceding resin flow solations to advance in the through hole 11, and the resin material of the bonding thin layer 26 that solidifies and the resin material combination well of bonding sheet 3 have guaranteed the binding ability of pcb board pressing.
Execution mode 4
As shown in Figure 5, the concrete manufacturing step of PCB comprises:
A) make daughter board 1, on daughter board 1, form through hole 11 and pressing surface 12;
B) the daughter board 1 with through hole 11 to pressing the surface barrier layer 2 to be set on 12, in the present embodiment barrier layer 2 is plugged in 1 pair of daughter board is pressed the aperture of through hole 11 on surface 12, can make barrier layer 2 with to pressing the surface 12 to flush, barrier layer 2 also can be with respect to pressing surface 12 depression or evaginations certainly; Be used for filling in the barrier layer 2 of blocking up through hole 11 and can select electrical insulator or electric conductor, wherein electrical insulator can be various types of resins, and electric conductor is copper slurry, silver slurry or carbon ink etc.;
C) in two through holes 11, filled in the daughter board 1 of having established barrier layer 2 to pressing between the surface 12, superimposed tack coat 3 adopts bonding sheet 3 to carry out the lamination combination between the daughter board 1;
D) pressing is later daughter board is made as PCB.
In this execution mode of the present invention, select non-conductive material body or electric conductor plugged in the aperture of the through hole 11 of daughter board 11 and form barrier layer 2, the resin flow solations before can stoping bonding sheet 3 uncured by this consent thing advance the through hole 11 of daughter board 1.
As shown in Figure 5, the circuit board 100 of the communication equipment of producing according to this manufacture method, comprise plural daughter board 1 with through hole 11, daughter board 1 has pressing surface 12, bonding sheet 3 and two daughter boards 1 to pressing the barrier layer 2 that is provided with between the surface 12 to be distributed in the aperture to the through hole 11 of pressing surface 12 of daughter board 1, two daughter boards 1 to pressing the surface to carry out pressing by bonding sheet 3 between 12, barrier layer 2 can with to pressing flush 12, wherein barrier layer 2 can be electrical insulator various types of resins for example, and barrier layer 2 also can be a for example copper slurry of electric conductor, silver slurry or carbon ink etc.Constituting barrier layer 2 by this consent thing can effectively stop the resin flow solation of bonding sheet 3 before uncured to advance in the through hole 11 equally.
But the above; it only is the specific embodiment of the present invention; can not limit scope of the invention process with this; all equivalent variations and modifications of doing according to summary of the invention of the present invention; and any other people stop the resin gummosis of bonding sheet 3 to enter the hole at daughter board 1 to pressing surface 12 integral surface or in aperture, being provided with the barrier layer to the position, aperture of pressing through hole local on the surface 12 or through hole; all should belong to protection scope of the present invention; and the material on barrier layer 2 also is not limited to mentioned material in each execution mode of the present invention, any can with bonding sheet 3 mutually pressing and can barrier resin the gummosis material that enters the hole all can adopt.
Claims (14)
1. the manufacture method of the circuit board of a communication equipment is characterized in that, comprises the steps:
A) the daughter board with through hole to pressing the surface that the barrier layer is set;
B) will be provided with between the daughter board on barrier layer and carry out pressing as binding by bonding sheet.
2. the manufacture method of circuit board according to claim 1 is characterized in that, in described steps A, described barrier layer is arranged on whole to pressing on the surface.
3. the manufacture method of circuit board according to claim 2 is characterized in that, described barrier layer is a barrier film, and described barrier film comprises adhesive-layer and resin bed; The step that separator is set described in the steps A be adhesive-layer with described barrier film be bonded in daughter board to pressing on the surface; In step B, two daughter boards to the resin bed of pressing lip-deep two barrier films between carry out pressing by bonding sheet.
4. the manufacture method of circuit board according to claim 2 is characterized in that, described barrier layer is a resin bed; The step that separator is set described in the steps A be daughter board to pressing external coating one deck resin bed, this resin bed is cured, make this tree refer to layer be bonded in daughter board to pressing on the surface; In step B, carry out pressing to pressing between lip-deep two resin beds by bonding sheet at two daughter boards.
5. the manufacture method of circuit board according to claim 2, it is characterized in that, described barrier layer comprises bonding thin slice and metal forming, the step that separator is set described in the described steps A be daughter board to pressing surface pressing one deck bonding thin slice and metal forming in regular turn, after the bonding thin slice solidifies, tear metal forming again; In step B, two daughter boards to pressing lip-deep two bondings to carry out pressing by bonding sheet between the thin slices.
6. the manufacture method of circuit board according to claim 1 is characterized in that, in described steps A, described barrier layer is covered the position, aperture of the through hole of daughter board.
7. the manufacture method of circuit board according to claim 6 is characterized in that, described barrier layer is a barrier film, and described barrier film comprises adhesive-layer and resin bed; In the step that separator is set described in the steps A is the position, aperture to the through hole of pressing the surface that adhesive-layer with described barrier film is bonded in daughter board; In step B, two daughter boards to the resin bed of pressing lip-deep barrier film and do not carried out pressing to pressing between the surface by bonding sheet by what resin bed covered.
8. the manufacture method of circuit board according to claim 6, it is characterized in that, described barrier layer is a resin bed, the step that separator is set described in the steps A be daughter board to pressing position, aperture brushing one deck resin bed of through hole on surface, this resin bed is cured, make this tree refer to the layer be bonded in daughter board to pressing on the surface; In step B, two daughter boards to pressing lip-deep resin bed and not carried out pressing to pressing between the surface by bonding sheet by what resin bed covered.
9. the manufacture method of circuit board according to claim 6, it is characterized in that, described barrier layer comprises bonding thin slice and metal forming, the step that separator is set described in the described steps A be daughter board to the position, aperture of the through hole of pressing the surface pressing one deck bonding thin slice and metal forming in regular turn, after the bonding thin slice solidifies, tear metal forming again; In step B, two daughter boards to press lip-deep bonding thin slice and not bonded sheet covers carry out pressing to pressing between the surface by bonding sheet.
10. the manufacture method of circuit board according to claim 1 is characterized in that, in described steps A, described barrier layer plug is located at daughter board in the aperture of pressing surperficial through hole.
11. the manufacture method of circuit board according to claim 10 is characterized in that, described barrier layer is electrical insulator or electric conductor, and described electrical insulator is a resin, and described electric conductor is copper slurry, silver slurry or carbon ink; In steps A, make the barrier layer with to pressing flush.
12. communication equipment, comprise at least one circuit board, described circuit board comprises plural daughter board with through hole, daughter board has pressing the surface, carry out pressing to pressing between the surface by bonding sheet at two daughter boards, it is characterized in that, described two daughter boards be respectively equipped with the barrier layer on the surface to pressing, the barrier layer on these two daughter boards combines with the two sides of this bonding sheet respectively.
13. communication equipment according to claim 12 is characterized in that, described barrier layer is distributed in whole to pressing the surface to go up or only cover the position, aperture of the through hole of daughter board, and described barrier layer is barrier film, resin bed or bonding thin slice.
14. communication equipment according to claim 12 is characterized in that, described barrier layer is distributed in daughter board in the aperture of through hole of pressing the surface, and the barrier layer with to the pressure flush; Described barrier layer is electrical insulator or electric conductor, and described electrical insulator is a resin, and described electric conductor is copper slurry, silver slurry or carbon ink.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101391980A CN101790285B (en) | 2009-05-13 | 2009-05-13 | Communication device and method for manufacturing circuit board of communication device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101391980A CN101790285B (en) | 2009-05-13 | 2009-05-13 | Communication device and method for manufacturing circuit board of communication device |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101956678A Division CN102300410A (en) | 2009-05-13 | 2009-05-13 | Communication equipment and manufacturing method of printed circuit board (PCB) thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN101790285A true CN101790285A (en) | 2010-07-28 |
| CN101790285B CN101790285B (en) | 2011-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009101391980A Active CN101790285B (en) | 2009-05-13 | 2009-05-13 | Communication device and method for manufacturing circuit board of communication device |
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| CN (1) | CN101790285B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103687308A (en) * | 2012-09-14 | 2014-03-26 | 北大方正集团有限公司 | Blind-hole Press-joint multilayer printed circuit board and manufacturing method thereof |
| CN109413893A (en) * | 2018-10-30 | 2019-03-01 | 珠海杰赛科技有限公司 | A kind of the lamination resistance gluing method and printed circuit board of blind slot printed circuit board |
| CN110191573A (en) * | 2019-06-04 | 2019-08-30 | 昆山市鸿运通多层电路板有限公司 | Deep gouge counterbore plate, pcb board and electronic equipment |
| CN114025486A (en) * | 2021-10-21 | 2022-02-08 | 深圳明阳电路科技股份有限公司 | Printed circuit board blind slot, printed circuit board, electronic equipment and manufacturing method thereof |
| CN115214209A (en) * | 2021-04-20 | 2022-10-21 | 庆鼎精密电子（淮安）有限公司 | Isolation film, manufacturing method of isolation film and manufacturing method of circuit board |
-
2009
- 2009-05-13 CN CN2009101391980A patent/CN101790285B/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103687308A (en) * | 2012-09-14 | 2014-03-26 | 北大方正集团有限公司 | Blind-hole Press-joint multilayer printed circuit board and manufacturing method thereof |
| CN103687308B (en) * | 2012-09-14 | 2016-12-21 | 北大方正集团有限公司 | Blind hole crimping multilayer board and preparation method thereof |
| CN109413893A (en) * | 2018-10-30 | 2019-03-01 | 珠海杰赛科技有限公司 | A kind of the lamination resistance gluing method and printed circuit board of blind slot printed circuit board |
| CN110191573A (en) * | 2019-06-04 | 2019-08-30 | 昆山市鸿运通多层电路板有限公司 | Deep gouge counterbore plate, pcb board and electronic equipment |
| CN115214209A (en) * | 2021-04-20 | 2022-10-21 | 庆鼎精密电子（淮安）有限公司 | Isolation film, manufacturing method of isolation film and manufacturing method of circuit board |
| CN115214209B (en) * | 2021-04-20 | 2024-05-10 | 庆鼎精密电子（淮安）有限公司 | Isolation film, manufacturing method of isolation film and manufacturing method of circuit board |
| CN114025486A (en) * | 2021-10-21 | 2022-02-08 | 深圳明阳电路科技股份有限公司 | Printed circuit board blind slot, printed circuit board, electronic equipment and manufacturing method thereof |
| CN114025486B (en) * | 2021-10-21 | 2024-02-23 | 深圳明阳电路科技股份有限公司 | Blind groove of printed circuit board, electronic equipment and manufacturing method of blind groove |
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| Publication number | Publication date |
|---|---|
| CN101790285B (en) | 2011-07-06 |
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