CN211240284U - PCB board that contains blind hole structure - Google Patents
PCB board that contains blind hole structure Download PDFInfo
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- CN211240284U CN211240284U CN202020061788.8U CN202020061788U CN211240284U CN 211240284 U CN211240284 U CN 211240284U CN 202020061788 U CN202020061788 U CN 202020061788U CN 211240284 U CN211240284 U CN 211240284U
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- blind hole
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Abstract
The utility model relates to the technical field of PCB boards, in particular to a PCB board with a blind hole structure, which comprises a PCB board body, wherein the PCB board body comprises a board body, the board body is provided with a blind hole, a top orifice of the blind hole is embedded with a copper ring I, and a plurality of copper rings II which are parallel to each other are arranged around the hole body of the blind hole; a prepreg is arranged at the bottom of the blind hole; the semi-solidified sheet with the coarse glass cloth layer is arranged at the bottom of the blind hole, so that the problem that copper on the hole wall and the hole bottom is easy to fall off and float after the PCB blind hole is electroplated can be solved, the reliability and yield of the PCB with the electroplated blind hole are improved, the great technical problem of the PCB in the fields of servers, industrial control, communication and the like is solved, and the development of the PCB and SMT industry is promoted.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a PCB board technical field, concretely relates to PCB board that contains blind hole structure.
[ background of the invention ]
A PCB board, also commonly referred to as a printed circuit board, is a platform for electrical connections of electronic components. The circuit board can be divided into a single-sided board, a double-sided board, a four-layer board, a six-layer board and other multi-layer circuit boards according to the number of the layers of the circuit board. The parts of the single-panel PCB are concentrated on one surface, and the wires are concentrated on the other surface. The double-sided PCB has wiring on both sides, and because wiring on both sides of the PCB requires appropriate circuit connections between the two sides, the "bridge" between the circuits is called a via. The via hole is a small hole filled or coated with metal on the PCB, and can be connected with the wires on both sides. The multi-layer board PCB is similar to the double-sided board PCB described above.
Therefore, blind holes needing electroplating are designed on a plurality of PCBs, as shown in FIG. 1, the blind holes 2a are formed in the PCB 1a, but the blind holes 2a are not communicated, so that the problem of unsmooth liquid medicine exchange can exist in the processes of chemical glue removal, chemical copper deposition and electroplating, and after electroplating, the bonding force of the blind hole wall copper 3a and the hole bottom copper 4a is insufficient, so that the defects of falling and floating are easily generated, and particularly, the defects are easily generated when the assembly is heated, and serious reliability risk is caused.
[ Utility model ] content
An object of the utility model is to provide a PCB board that contains blind hole structure to prior art's defect and not enough.
The PCB board with the blind hole structure comprises a PCB board body, wherein the PCB board body comprises a board body, the board body is provided with a blind hole, a first copper ring is embedded in a top orifice of the blind hole, and a second copper ring which is parallel to each other is arranged around the hole body of the blind hole to form a second copper ring frame cylinder; a prepreg is arranged at the bottom of the blind hole;
a plurality of first vertical reinforcing rods are uniformly arranged between the first copper ring and the second copper ring on the upper part of the blind hole, the cross section of each first vertical reinforcing rod is circular, and the first vertical reinforcing rods form an upper reinforcing ring frame;
a plurality of vertical reinforcing rods II are uniformly arranged in the middle between a copper ring II on the upper part of the blind hole and a copper ring II in the middle of the blind hole, a horizontal connecting rod I is arranged in the middle of the inner side surface of each vertical reinforcing rod II, and a horizontal expansion spring is arranged on the inner end of each horizontal connecting rod I to form a middle anti-deformation reinforcing ring frame;
a plurality of vertical reinforcing rods III are uniformly arranged in the middle between the copper ring II in the middle of the blind hole and the copper ring II at the bottom of the blind hole, a horizontal connecting rod II is arranged in the middle of the inner side surface of the reinforcing rod III, and a horizontal expansion spring is arranged on the inner end of the horizontal connecting rod II to form a bottom anti-deformation reinforcing ring frame;
inner cylinders are arranged on the inner walls of the first copper ring and the second copper ring of the copper ring frame cylinder; the inner ends of the middle anti-deformation reinforcing ring frame and the bottom anti-deformation reinforcing ring frame are respectively connected with the outer side surface of the inner cylinder; the top surface and the bottom surface of the inner cylinder are in an open shape;
a supporting platform is arranged at the bottom of the prepreg at the position corresponding to the blind hole, a convex cylinder platform is arranged at the top of the prepreg at the position of the blind hole, and an annular groove matched with a bottom end opening of the inner cylinder is arranged on the bottom surface of the convex cylinder platform; and a bottom end opening of the inner cylinder is clamped in an annular groove of a convex cylinder table of the prepreg.
Furthermore, coarse glass cloth layers are arranged on the surface and the bottom surface of the prepreg.
Furthermore, the central axes of the first copper ring, the blind hole and the second copper ring are in the same vertical line.
Furthermore, the upper reinforcing ring frame, the middle anti-deformation reinforcing ring frame and the bottom anti-deformation reinforcing ring frame are of concentric circle structures.
Furthermore, the diameters of the upper reinforcing ring frame, the middle anti-deformation reinforcing ring frame and the bottom anti-deformation reinforcing ring frame are changed from small to large, so that a multi-stage step structure is formed.
After the structure is adopted, the utility model discloses beneficial effect does: a PCB board that contains blind hole structure, it adopts to be provided with a plurality of copper rings on the blind hole, the bottom of blind hole is provided with the prepreg that contains the thick glass cloth layer, it has can solve PCB blind hole and electroplate back pore wall and the bottom of the hole copper difficult problem that comes off and float easily, has improved reliability and the yield that contains electroplating blind hole PCB, has solved great technological problem for the PCB in fields such as server, industry control, communication, has promoted the development of PCB and SMT trade.
[ description of the drawings ]
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, do not constitute a limitation of the invention, and in which:
fig. 1 is a schematic structural diagram of a conventional blind hole in the background art of the present invention;
fig. 2 is a schematic structural diagram of the present invention.
Description of reference numerals:
1. a PCB body; 11. a plate body; 12. blind holes; 13. a first copper ring; 14. a second copper ring; 15. a prepreg; 16. a coarse glass cloth layer; 17. a first vertical reinforcing rod; 18. a tension spring; 19. a first horizontal connecting rod; 110. a second vertical reinforcing rod; 111. a third vertical reinforcing rod; 112. a horizontal connecting rod II; 113. a saddle; 114. a convex cylinder platform.
[ detailed description ] embodiments
The invention will be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and the description are only for the purpose of explanation, but not for the purpose of limitation.
As shown in fig. 2, the PCB board with a blind via structure according to the present embodiment includes a PCB board body, the PCB board body 1 includes a board body 11, the board body 11 is provided with a blind via 12, a first copper ring 13 is embedded in an orifice on a top surface of the blind via 12, and three second copper rings 14 parallel to each other are disposed around the hole body of the blind via 12 to form a second copper ring frame; a prepreg 15 is arranged at the bottom of the blind hole 12;
a plurality of first vertical reinforcing rods are uniformly arranged between the first copper ring 13 and the second copper ring 14 on the upper part of the blind hole 12, the cross section of each first vertical reinforcing rod is circular, and the first vertical reinforcing rods form an upper reinforcing ring frame;
a plurality of vertical reinforcing rods II 110 are uniformly arranged in the middle between the copper ring II 14 on the upper part of the blind hole 12 and the copper ring II 14 in the middle of the blind hole, a horizontal connecting rod I19 is arranged in the middle of the inner side surface of each vertical reinforcing rod II 110, and a horizontal expansion spring 18 is arranged on the inner end of each horizontal connecting rod I19 to form a middle anti-deformation reinforcing ring frame;
a plurality of vertical reinforcing rods III 111 are uniformly arranged in the middle between the copper ring II 14 in the middle of the blind hole 12 and the copper ring II 14 at the bottom of the blind hole, a horizontal connecting rod II 112 is arranged in the middle of the inner side surface of the reinforcing rod III 111, and a horizontal expansion spring 18 is arranged on the inner end of the horizontal connecting rod II to form a bottom anti-deformation reinforcing ring frame;
inner cylinders are arranged on the inner walls of the first copper ring 13 and the second copper ring 14 of the copper ring frame cylinder; the inner ends of the middle anti-deformation reinforcing ring frame and the bottom anti-deformation reinforcing ring frame are respectively connected with the outer side surface of the inner cylinder; the top surface and the bottom surface of the inner cylinder are in an open shape;
a support platform 113 is arranged at the bottom of the prepreg 15 corresponding to the blind hole 12, a convex cylinder platform 114 is arranged at the top of the blind hole 12 of the prepreg 15, and a ring groove matched with a bottom end opening of the inner cylinder is arranged on the bottom surface of the convex cylinder platform 114; the bottom end opening of the inner cylinder is clamped in the annular groove of the convex cylinder table 114 of the prepreg 15.
Further, the surface and the bottom surface of the prepreg 15 are provided with a coarse glass cloth layer 16.
Further, the central axes of the first copper ring 13, the blind hole 12 and the second copper ring 14 are in the same vertical line.
Furthermore, the upper reinforcing ring frame, the middle anti-deformation reinforcing ring frame and the bottom anti-deformation reinforcing ring frame are of concentric circle structures.
Furthermore, the diameters of the upper reinforcing ring frame, the middle anti-deformation reinforcing ring frame and the bottom anti-deformation reinforcing ring frame are changed from small to large, so that a multi-stage step structure is formed.
The working principle of the utility model is as follows:
in the design, in order to solve the problem of hole wall copper falling, a non-functional copper ring is added on the inner layer during the design of the PCB so as to increase the binding force.
In the design, in order to solve the problem of copper floating at the bottom of the hole, 7628 or 2116 prepregs containing coarse glass cloth are selected at the bottom of the hole during the laminated design of the PCB so as to increase the roughness and the bonding force of the bottom of the hole.
The processing technology of the design is as follows:
traditional PCB process flow who contains the blind hole does, … … accuse bores the blind hole high pressure washing chemistry deeply and removes the heavy copper electroplating copper … … of glue sediment chemistry, the shortcoming of this flow removes when gluing the sediment for chemistry, owing to be the resin that produces when cleaing away the drilling through chemical liquid medicine glues the sediment, and because liquid medicine exchange is not smooth in the blind hole, it is just extremely difficult completely to clear away the sediment at the resin of hole bottom position, it can lead to the cohesion weak between hole bottom copper and the hole bottom glass cloth to glue the sediment, and then leads to hole bottom copper to float. If the mode of prolonging the chemical degumming time is adopted, the hole wall degumming is excessive, and the roughness of the electroplated hole wall is too large.
The design helps to clean the resin glue residue at the bottom of the blind hole by adding a plasma etching process before chemical glue residue removal. The method comprises the following steps: the method is characterized in that CF4, Q2, N2 and other gases are filled into a vacuumized closed container, and radio frequency line high voltage is applied to ionize the gases, so that free radicals with high activity can be obtained, resin glue residues are further attacked, and the purpose of removing the glue residues by etching is achieved. The specific process is … … high-pressure water washing plasma etching chemical glue residue removing chemical copper deposition and electroplating … … for deep drilling blind holes. Therefore, the difficult problem that the copper on the wall of the blind hole and the copper on the bottom of the blind hole fall off and float can be thoroughly solved through the optimization in design and process.
In the design, a plurality of first vertical reinforcing rods are uniformly arranged between the first copper ring 13 and the second copper ring 14 on the upper part of the blind hole 12, the cross section of each first vertical reinforcing rod is circular, and the first vertical reinforcing rods form an upper reinforcing ring frame; a plurality of vertical reinforcing rods II 110 are uniformly arranged in the middle between the copper ring II 14 on the upper part of the blind hole 12 and the copper ring II 14 in the middle of the blind hole, a horizontal connecting rod I19 is arranged in the middle of the inner side surface of each vertical reinforcing rod II 110, and a horizontal expansion spring 18 is arranged at the inner end of each horizontal connecting rod I19 to form a middle anti-deformation reinforcing ring frame; a plurality of vertical reinforcing rods III 111 are uniformly arranged in the middle between the copper ring II 14 in the middle of the blind hole 12 and the copper ring II 14 at the bottom of the blind hole, a horizontal connecting rod II 112 is arranged in the middle of the inner side surface of the reinforcing rod III 111, and a horizontal expansion spring 18 is arranged on the inner end of the horizontal connecting rod II to form a bottom anti-deformation reinforcing ring frame; the inner ends of the middle anti-deformation reinforcing ring frame and the bottom anti-deformation reinforcing ring frame are respectively connected with the outer side surface of the inner cylinder to form an integral blind hole protection structure.
In this design, deformation is prevented at the middle part and is strengthened the circle frame, the bottom is prevented deformation and is strengthened the circle frame by being provided with expanding spring to can be because of being heated when leading to the blind hole to warp, expanding spring has certain cushioning effect this moment, thereby can guarantee when taking place to warp or when deforming, can resume to original state, thereby guarantee the use of blind hole.
In the design, a supporting platform 113 is arranged at the bottom of the position of the prepreg 15 corresponding to the blind hole 12, a convex cylinder platform 114 is arranged at the top of the position of the blind hole 12 of the prepreg 15, and a ring groove matched with a bottom end opening of the inner cylinder is arranged on the bottom surface of the convex cylinder platform 114; the bottom end socket of the inner cylinder is clamped in the annular groove of the convex cylinder table 114 of the prepreg 15, so that accurate positioning between the inner cylinder and the prepreg 15 can be guaranteed, the inner cylinder and the prepreg 15 also form a whole, and the using effect is further improved.
A PCB board that contains blind hole structure, it adopts to be provided with a plurality of copper rings on the blind hole, the bottom of blind hole is provided with the prepreg that contains the thick glass cloth layer, it has can solve PCB blind hole and electroplate back pore wall and the bottom of the hole copper difficult problem that comes off and float easily, has improved reliability and the yield that contains electroplating blind hole PCB, has solved great technological problem for the PCB in fields such as server, industry control, communication, has promoted the development of PCB and SMT trade.
The above is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles in accordance with the claims of the present invention are included in the claims of the present invention.
Claims (5)
1. The utility model provides a PCB board that contains blind hole structure which characterized in that: the PCB comprises a PCB body, wherein the PCB body comprises a plate body, a blind hole is formed in the plate body, a first copper ring is embedded in an orifice on the top surface of the blind hole, and a second copper ring which is parallel to each other is arranged on the periphery of the hole body of the blind hole to form a second copper ring frame; a prepreg is arranged at the bottom of the blind hole;
a plurality of first vertical reinforcing rods are uniformly arranged between the first copper ring and the second copper ring on the upper part of the blind hole, the cross section of each first vertical reinforcing rod is circular, and the first vertical reinforcing rods form an upper reinforcing ring frame; a plurality of vertical reinforcing rods II are uniformly arranged in the middle between a copper ring II on the upper part of the blind hole and a copper ring II in the middle of the blind hole, a horizontal connecting rod I is arranged in the middle of the inner side surface of each vertical reinforcing rod II, and a horizontal expansion spring is arranged on the inner end of each horizontal connecting rod I to form a middle anti-deformation reinforcing ring frame; a plurality of vertical reinforcing rods III are uniformly arranged in the middle between the copper ring II in the middle of the blind hole and the copper ring II at the bottom of the blind hole, a horizontal connecting rod II is arranged in the middle of the inner side surface of the reinforcing rod III, and a horizontal expansion spring is arranged on the inner end of the horizontal connecting rod II to form a bottom anti-deformation reinforcing ring frame; inner cylinders are arranged on the inner walls of the first copper ring and the second copper ring of the copper ring frame cylinder; the inner ends of the middle anti-deformation reinforcing ring frame and the bottom anti-deformation reinforcing ring frame are respectively connected with the outer side surface of the inner cylinder; the top surface and the bottom surface of the inner cylinder are in an open shape; a supporting platform is arranged at the bottom of the prepreg at the position corresponding to the blind hole, a convex cylinder platform is arranged at the top of the prepreg at the position of the blind hole, and an annular groove matched with a bottom end opening of the inner cylinder is arranged on the bottom surface of the convex cylinder platform; and a bottom end opening of the inner cylinder is clamped in an annular groove of a convex cylinder table of the prepreg.
2. The PCB board with the blind via structure as claimed in claim 1, wherein: and the surface and the bottom surface of the prepreg are provided with coarse glass cloth layers.
3. The PCB board with the blind via structure as claimed in claim 1, wherein: the central axes of the first copper ring, the blind hole and the second copper ring are in the same vertical line.
4. The PCB board with the blind via structure as claimed in claim 1, wherein: the upper reinforcing ring frame, the middle anti-deformation reinforcing ring frame and the bottom anti-deformation reinforcing ring frame are of concentric circle structures.
5. The PCB board with the blind via structure as claimed in claim 1, wherein: the diameters of the upper reinforcing ring frame, the middle anti-deformation reinforcing ring frame and the bottom anti-deformation reinforcing ring frame are changed from small to large, and a multistage step structure is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020061788.8U CN211240284U (en) | 2020-01-13 | 2020-01-13 | PCB board that contains blind hole structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020061788.8U CN211240284U (en) | 2020-01-13 | 2020-01-13 | PCB board that contains blind hole structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211240284U true CN211240284U (en) | 2020-08-11 |
Family
ID=71916501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020061788.8U Active CN211240284U (en) | 2020-01-13 | 2020-01-13 | PCB board that contains blind hole structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211240284U (en) |
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2020
- 2020-01-13 CN CN202020061788.8U patent/CN211240284U/en active Active
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