JPH098464A - Manufacture of multilayer board - Google Patents

Abstract

PURPOSE: To manufacture a multilayer board, which is superior in interlayer position accuracy, by a method wherein clearances provided between the surfaces of internal layer materials and eyeletting materials are formed in such a way that the bent points of the eyeletting materials escapes outward to spread along the upper surfaces of the internal layer materials. CONSTITUTION: Guide holes 6 and eyelet holes 14 for caulking use, which penetrate the outer frame part of a prepreg 3 inserted between the internal layer materials 4 and 4 of a plurality of internal layer materials 4 which respectively have wiring patterns formed on both surfaces of their surface and rear, are installed in the materials 4 and the prepreg 3. After pins are erected in the guide holes 6 and the materials 4 are stacked, eyeletting materials 16 are stuck on the holes 14 installed in the materials 4 and the prepreg 3 and the materials 4 and the prepreg 3 are caulked to form into an integral molded material 17. At this time, clearances are provided between the surfaces of the materials 4 fastened by the materials 16 and heading open dies, which cut open and pressingly bend the point parts of the materials 16 using an eyeletting jig for striking the materials 16 in the holes 14, and these clearances are formed in such a way that the bent points of the materials 16 escape smoothly to outward to spread along the upper surfaces of the materials 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a multilayer wiring board, and more particularly to a method for manufacturing a multilayer board using a plurality of inner layer materials and having excellent interlayer accuracy.

[0002]

2. Description of the Related Art With the increase in speed and density of industrial electronic equipment, wiring boards have been made higher in number, and the use of multilayer boards having 6 or more conductor layers has been increasing (Japanese Patent Laid-Open No. 2004-242242). 62-
18245, JP-A-62-18247).
Such a multi-layer wiring board having six or more layers is conventionally shown in FIGS.
By the pin lamination method as shown in (hereinafter abbreviated as "pin lamination method"), the guide holes 6 are formed at predetermined positions of all the plates to be laminated such as the outer layer copper clad laminate, the copper foil, the prepreg 3, the inner layer material 4 and the like. A guide pin is set up on a dedicated mold 10, a plurality of sheets are stacked by inserting the above-mentioned materials into these pins with a stainless steel plate interposed therebetween, and the stacked body 5 is placed in a hot press to apply heat and pressure. It was manufactured by laminating and integrating. However, in the pin-lamination method, the guide pin for the dedicated die is used to insert many multi-layer plates, stainless steel plates, and the upper die, so that an extremely long length is used and lay-up workability is improved. There was a problem of significantly lowering it. Further, the prepreg resin powder attached around the pins adheres to the surface of the outer layer material at the time of layup, which causes dents during molding.

As a method for overcoming these problems in recent years, Japanese Patent Laid-Open Nos. 63-173624 and 2-10.
As seen in Japanese Patent No. 888, the prepreg is sandwiched between the inner layer material and the inner layer material by the eyelet material, the cylindrical eyelet material is inserted into the pre-opened caulking hole, and after caulking and integrated, both surfaces are formed. A method has been proposed in which a prepreg, a copper foil, an outer layer copper-clad laminate, and the like are stacked and heated and pressure-molded to form a multilayer board.

[0004]

However, the conventional method of caulking eyelets as shown in FIG. 7 (a) is to caulk a hole for a string to pass through such as a duck or a document so as to reinforce and easily pass through the hole. This is for securing the height, crimping the circuit on the board and soldering on it, and the eyelet must be securely fixed to the object by crimping. Therefore, the split tip 20C is formed into a hemisphere so that the end of the snap fit is curved so as not to escape from the surface of the object and stops by biting into the object, and there is no clearance between the outer periphery of the split piece and the surface of the object during the crimping step. Is the usual method. Therefore, in the above-mentioned previously proposed method in which this conventional technique is applied to the production of a multilayer wiring board, the state in which the eyelet material is caulked is formed in a mountain shape as shown in FIG. 7 (c). In the pressing stage, the load is concentrated on the eyelet material, which causes buckling of the eyelet material, and when a thin inner layer material is used, there is a problem that the interlayer position accuracy decreases due to base material destruction, etc. If the method requires high precision,
The fact is that it is not used in the production of prepreg laminated multilayer boards.

Further, in contrast to the prepreg laminated multilayer board in which the prepreg, the outer layer copper foil, and the outer layer copper clad laminate are arranged outside the inner layer material described above, the inner layer material having the double-sided copper foil is arranged on the outermost side of the multilayer board. In the core laminated multi-layer board, the conditions are more severe because the eyelet material is exposed on the surface of the multi-layer board.In the conventional method of crimping the eyelet, the concentration of pressure on the flange portion of the chevron formed is remarkable. Buckling of the material cylinder was unavoidable, and it was impossible to apply the eyelet method to the manufacture of the core laminated multilayer board.

The present invention has been achieved as a result of an examination in view of the problems as described above, and provides a method for producing a multilayer board having excellent interlayer positioning accuracy in a multilayer board using eyelet materials for alignment. It is a thing.

[0007]

Means for Solving the Problems As a result of intensive studies made by the present inventors in order to solve the above problems, as shown in FIG. 3, a plurality of inner layers each having a wiring pattern formed on the front and back surfaces thereof are formed. A prepreg 3 sandwiched between the material 4 and the inner layer material, a guide hole 6 penetrating the outer frame portion, and an eyelet hole 14 for caulking.
After stacking the guide pins 15 in predetermined guide holes and stacking them, the cylindrical shaft portion 23 as shown in FIG. 4 is inserted into the crimping eyelets provided at predetermined positions of the inner layer material and the prepreg.
A method for solving the following problems has been reached in the method of driving the eyelet material 16 including the and the flange portion 24 by swaging and integrating them.

That is, according to the present invention, a plurality of inner layer members each having a wiring pattern formed on the front and back surfaces thereof and a prepreg sandwiched between the inner layer members are provided with guide holes and crimping eyelets in the outer frame portion. After vertically stacking the pins in the guide hole, the eyelet material composed of the cylindrical portion and the flange portion is inserted into the eyelet material for caulking arranged at a predetermined position of the inner layer material and the prepreg to form an integrally molded product, When the outer layer copper-clad laminate, copper foil, and prepreg are stacked on both sides and the prepreg laminate multilayer board obtained by heat-pressing is crimped, the surface of the inner layer material that is fastened by the eyelet material and the eyelet material are A clearance is provided between the eyelet material of the driving eyelet jig and the split piece that opens and bends the eyelet material, and the bent tip of the eyelet material smoothes the upper surface of the inner layer material. A method of manufacturing a prepreg laminate multilayer board, characterized by being configured so as to spread escapes to outer periphery.

Further, a plurality of inner layer members each having a wiring pattern formed on the inner layer member and a prepreg sandwiched between the inner layer members,
After the guide hole and the crimping eyelet hole are installed in the outer frame, and the pins are vertically stacked in the predetermined guide hole, the cylindrical portion and the flange portion are placed in the crimping eyelet hole arranged at the predetermined positions of the inner layer material and the prepreg. Inserting an eyelet material consisting of the above into an integrally molded product and heat-pressing it to obtain a core laminated multilayer plate.In the step of caulking the eyelet material, the surface of the inner layer material that is fastened by the eyelet material and the eyelet material are driven. It is characterized in that a clearance is provided between the eyelet material of the tool and a split piece that opens and pushes and bends, and the bent tip of the eyelet material is configured to spread smoothly over the upper surface of the inner layer material to the outer periphery. The present invention relates to a method for producing a core laminated multilayer board.

Further, the present invention relates to a method for producing a prepreg laminated multilayer board, wherein the eyelet material is copper. In addition, the opening length 1 of the spherical depression that cuts open and bends the end of the eyelet material provided on the split piece of the eyelet jig for opening the eyelet material (If the thickness of the eyelet axis is t, the axis is cracked and folded, so generally l> 2t. ) And the depth m of the opening (m / l)
The present invention relates to a method for manufacturing a multilayer board, characterized in that split pieces having a ratio of 0.4 or less are used. Further, the present invention relates to a method for producing a multilayer board, which is characterized in that the forming is carried out by using an autoclave type vacuum press.

The present invention will be described in more detail below. That is, the manufacturing method of the multilayer board of the present invention is common to the manufacturing of the prepreg laminated multilayer board and the core laminated multilayer board, and by devising the eyelet crimping of the integrally molded product 17 of the inner layer material,
It is intended to realize a high-precision multilayer plate by preventing interlayer displacement during pressing.

In order to form the integrally formed portion of the inner layer material, as shown in FIG. 3, the outer frame portion of the prepreg 3 sandwiched between a plurality of inner layer materials 4 each having wiring patterns formed on the front and back surfaces thereof. After installing the guide hole 6 and the crimping eyelet hole 14 penetrating through the pin and stacking the pins 15 upright in the predetermined guide hole, the eyelet material is inserted into the crimping eyelet hole installed at the predetermined positions of the inner layer material and the prepreg. 16 is hammered in and caulked to be integrated into an integrally molded product 17. FIG.
2 is a schematic cross-sectional view showing a case where the prepreg 3 and the outer layer material 2 are arranged by using the integrally molded product 17 and the prepreg laminated multilayer board is press-molded. The eyelet jig for driving the eyelet material into the eyelet for caulking cuts open the tip end of the cylindrical portion of the eyelet material and press-bends to fix it.

As shown in FIGS. 7 and 8, the eyelet jig 1
Reference numeral 8 is composed of a receiving piece 19 for supporting the eyelet material, and a split piece 20 made of iron or the like for cutting open and bending the cylindrical portion of the eyelet material. As shown in FIG. 7, in the conventional eyelet jig, in order to securely fix the eyelet material to the object as described above, the tip of the eyelet material does not escape from the surface of the object and is slightly bited. As shown in (b), generally, the structure is such that there is no clearance between the split piece and the surface of the object. In the method using such an eyelet jig, as shown in FIG.
As shown in Fig. 6, the eyelet material of the caulked part is formed into a mountain shape, so the tip of the eyelet bent by the pressure at the time of pressing further bites into the target object, loses escape and buckles, breaks the base material, etc. The present inventors have found that

On the other hand, in the method of the present invention, FIG.
As shown in FIG. 5, an eyelet jig having a structure in which a clearance g is secured between the split piece 20 of the eyelet jig and the surface of the inner layer material 21 by caulking work by adjusting the stopper 26 or the like is used. As a result, the tip of the eyelet material that has been broken out goes out of this clearance and spreads along the surface of the inner layer material, so that the split flange portion formed by caulking becomes flat. As a result, even if pressure is applied at the time of pressing, it does not get into the surface of the inner layer material, and only spreads along the surface with low resistance, and the possibility of buckling or damage is reduced.

The size of the clearance is not particularly limited, but the thickness t of the eyelet material is an approximate lower limit.
Although the upper limit is not particularly defined, as the clearance increases, the protruding height of the split flange portion from the surface of the inner layer material increases, and the possibility of buckling during pressing increases. Therefore, it is preferable to keep the clearance distance g between the split piece of the eyelet jig and the surface of the inner layer material to about t to 3t.

Furthermore, the shape of the split pieces of the eyelet jig is shown in FIG.
The basic shape is shown in (a), and the relationship between the length l and the depth m of the opening of the depression is shown in FIG. FIG. 6B 20
20a- is an example of the sectional shape of the split piece defined in the preferred embodiment (claims 3 and 6) of the present invention.
Is m = 0, that is, m / l = 0 in the ratio (m / l) of the length l (l> 2t) of the opening of the depression and the depth m of the opening.
In the structure having no opening recess, 20a- is an example in which the opening recess m / l is 0.2, and 20a- is m.
In this example, / l is 0.4. FIG. 6 (b) 20a- is a conventional type, and the m / l of the opening recess is about 0.5. In this case, if the clearance is set to 0, the conventional eyelet material caulking method itself is used. FIG. 6C shows a plan view of the split piece.

FIG. 7A shows a sectional structure of a conventional eyelet material caulking method when the clearance is set to 0 in FIG. 6B 20a. In this case, in order to make the clearance zero, there are a method of adjusting the stopper and a method of bringing the split pieces into close contact with each other without the stopper by the pressure itself. Further, FIG. 7B shows a sectional structure during the crimping work, and FIG. 7C shows a sectional structure of the eyelet material after crimping.

On the other hand, FIG. 8 (a) shows a sectional structure of the split piece of FIG. 6 (b) 20a- when performing the crimping work by providing a clearance between the split piece and the inner layer material fastened by the stopper. Shown in. The sectional structure during the crimping work is shown in FIG. 8B, and the sectional structure of the eyelet material after crimping is shown in FIG. 8C. Therefore, FIG. 7C shows a typical shape of the conventional eyelet crimping, and FIG. 8C shows a typical shape of the eyelet crimping according to the present invention.

FIG. 10 shows a case where the combination of the clearance value g between the split piece and the inner layer material to be fastened and the m / l value which is the ratio of the length l of the opening and the depression m of the opening is changed. A typical example showing how the cross-sectional structure of the eyelet material after being crimped is different is shown.

The shape of the split piece will be described in more detail. As shown in FIG. 6, the central projection 2 is formed at the tip of the split piece 20.
0e, the blade-shaped projections 20b that are connected to it are arranged in a radial pattern, and the ridge portion 2 of the spherical depression 20c that is further connected to it
0d works as a full-scale split blade. As shown in FIG. 8, the split piece 20 is pressed from above the eyelet material 16 inserted into the caulking eyelet hole 14 of the inner layer material 21, advances while cutting the cylindrical shaft portion of the eyelet material, and stops by hitting the stopper 26. Completion [FIG. 8 (b)]. In order to achieve this crimping state, it is necessary to make an optimal clearance between the split piece and the inner layer material that is fastened by adjusting the stopper position.The existence of this clearance causes the tip of the eyelet material to cut open, push and bend. A space that horizontally spreads is secured on the surface of the inner layer material in the process of being formed, and the flange portion is formed flat as shown in FIG. 8C. This prevents local pressure concentration on the eyelet during molding,
It is possible to prevent buckling of the eyelets and breakage of the inner layer material, and it is possible to make the interlayer positional accuracy of the multilayer plate excellent by the eyelet method.

Further, in the shape of the split piece, by keeping the ratio m / l of the opening length 1 and the opening depth m to 0.4 or less in the opening of the split piece opening, the open end of the eyelet material is opened. It can be smoothly inserted into the clearance portion, the flange portion formed by caulking can be more reliably flattened, and the interlayer position accuracy of the multilayer plate by the eyelet method can be further improved.

In actual production, it is often the case that inner layer materials of different thickness must be processed one after another, and when clearance g = 0, a large number of eyelets with axial lengths corresponding to each thickness are prepared. It becomes necessary to replace it, which causes great confusion. However, if the top end of the eyelet material can be cut open and go out through the clearance and spread evenly, the tolerance for changes in the thickness of the inner layer material will be dramatically increased, and one or several types of axial lengths can be used. It is also an advantage that cannot be overlooked that it will be possible to respond and it will be very effective for industrialization.

The eyelet jig according to the present invention can be obtained by a new method, as shown in FIG. 6 (a).
11 (a) and 11 (b), a method of cutting a conventional split piece 30 shown in FIG. 11 (a), FIG.
It can be obtained by a method of cutting the portion 31 of (a) [FIG. 11 (c), dotted line portion cut] or the like. Even in the method using the eyelet jig obtained by such a method, it is possible to achieve the same effect as that of using the newly created split piece.

In the present invention, not only the prepreg laminated multilayer plate but also the core laminated multilayer plate can be manufactured with high precision by the fitting method. Especially in the core lamination method, the eyelet flange portion is exposed compared to the ordinary copper foil lamination method, so pressure concentration is likely to occur during molding and there is a risk of misalignment due to buckling etc. It was impossible to manufacture a practical core laminated multilayer board. However, according to the present invention, the concentration of pressure on the eyelet flange portion formed by crimping at the time of molding can be relaxed, and a practical core laminated multilayer board can be manufactured.

In the present invention, by using an autoclave type vacuum press for molding, it has become possible to manufacture a multilayer board with even better interlayer accuracy by the eyelet method. The autoclave type vacuum press is a molding method in which the occurrence of misalignment is inherently unlikely to occur because pressure is applied from the side of the laminated plate as well, because pressure is applied by gas. By combining this with the fact that the split flange shape after crimping is in a state where local pressure concentration is prevented, it becomes possible to achieve excellent interlayer positional accuracy.

In the present invention, the eyelet material, which is obtained by caulking the inner layer material and the prepreg to be integrated, is made of a metal having a high melting point such as aluminum, brass, copper, tin or solder.
As shown in FIG. 4, the one having the flange portion 24 together with the cylindrical shaft portion 23 is used. In particular, it is preferable to use copper from the viewpoint of productivity.

Further, in order to prevent buckling, the neck portion 25 of the flange portion is made to be in a state close to a right angle during drawing. Furthermore, in using the eyelet material,
Applying a release agent facilitates insertion of the eyelet material into the target hole and removal from the split piece, and is effective in reducing wear of the split piece and extending the life of the eyelet material. It is also effective in preventing buckling of the.

[0028]

The present invention will be described in more detail with reference to the following examples. The eyelet axis length was selected and used in conformity with each embodiment. [Examples 1 to 12] The inner layer material was a copper foil patterned on both sides. A prepreg was used as the insert material used between the inner layer materials. 0.2 mm inner layer material and 0.
After a guide hole and a crimping hole for eyelets were previously provided in a 1 mm prepreg, pins were set up in the guide hole and two prepregs were stacked between the inner layer material and the inner layer material, and the eyelet material was inserted into the crimping hole for the eyelet. The material of the eyelet material is brass, copper,
Or aluminum. After that, with respect to the four kinds of split pieces 20a- shown in FIG. 6B, the clearance between the split piece and the surface of the inner layer material to be fastened is 1 times, 3 times, and 5 times the thickness t of the eyelet material. Thus, the caulking work was performed. Although they were integrated by caulking work, 2 sheets of prepreg 0.1 mm each without holes and 1 sheet of 18 μ copper foil were stacked on each side, and both sides were sandwiched by stainless plates without holes to make one unit, and several units were stacked. On top of that, molds without holes were stacked on the top and bottom. The length of the eyelet shaft was selected so that a considerable portion of the cracked and spread shaft tip penetrates into the clearance between the split piece and the inner layer plate surface. For molding, an autoclave press (AVP) was used, the temperature was 175 ° C. for 2 hours, the pressure was 12 kg / cm ² , and the degree of vacuum in the molding material was 10 Torr.

The following evaluations were performed on these multilayer boards, and the results are shown in Table 1. (1) Depth of layer ... The amount of shift between the layer shift mark position on each inner layer material and the design value was measured by a coordinate measuring machine for 10 points in each example, and the maximum value was displayed in micron units. (2) Buckling evaluation: symbol A indicates no buckling, B indicates slight buckling, C indicates buckling, and D indicates severe buckling. (3) Life of split pieces: Indicates the cumulative number of eyelets when split pieces are replaced due to wear of split pieces.

In this embodiment, as the inner layer material, a copper foil patterned on both sides was used. However, the inner layer material in the present invention is a double-sided or single-sided copper clad laminate, and a pattern is formed by a usual method. What was made to use can be used. Further, as the insert material used between the inner layer materials,
Although a prepreg was used in the examples, a resin film is also possible.

Example 13 A core laminated multilayer board using three 0.2 mm inner layer materials was evaluated. After patterning the copper foil of the inner layer portion (second layer to fifth layer) of the 0.2 mm inner layer material and providing the guide hole and the caulking hole for the eyelet in advance with the 0.1 mm prepreg, set the pins in the guide holes and set them to 3 respectively. After stacking a sheet of inner layer material and a prepreg between the inner layer materials and inserting the eyelet material into the caulking hole for the eyelet, FIG.
Using the split piece shown in 0a-, the material of the eyelet was brass, and the caulking work was performed so that the clearance between the split piece and the inner layer material to be fastened was three times the wall thickness t of the eyelet material. The thus-integrated product was sandwiched between stainless plates having no holes, this was repeated several times, and then a mold having no holes was stacked. The molding was performed in the same manner as in Example 1, and the evaluation was performed in the same manner as in Example 1. The results are shown in Table 1.

[Examples 14 to 26] Layup was carried out under the same conditions as in Examples 1 to 13, the molding was carried out using a hydro vacuum press (HVP) at a temperature of 175 ° C for 1.5 hours and a pressure of 40 kg. / Cm ² , the degree of vacuum in the molding material is 3
It was set to 0 Torr. Table 1 shows the results of the evaluation.

[Comparative Example 1] FIG. 6A as an eyelet jig.
A multi-layer board was manufactured under the same conditions as in Example 1 except that the clearance between the split piece and the surface of the inner layer material to be fastened was zero. Evaluation was performed in the same manner as in Example 1, and the results are shown in Table 1.

[Comparative Example 2] FIG. 6A as an eyelet jig.
A multilayer board was manufactured under the same conditions as in Example 13 except that the clearance between the split piece and the inner layer material to be fastened was zero. The evaluation was performed in the same manner as in Example 1, and the results are shown in Table 1.

[Comparative Example 3] FIG. 6A as an eyelet jig.
A multi-layer board was manufactured under the same conditions as in Example 14 except that the clearance between the split piece and the surface of the inner layer material to be fastened was zero. The evaluation was performed in the same manner as in Example 1, and the results are shown in Table 1.

[Comparative Example 4] FIG. 6A as an eyelet jig.
A multilayer board was manufactured under the same conditions as in Example 26 except that the clearance between the split piece and the surface of the inner layer material to be fastened was zero. The evaluation was performed in the same manner as in Example 1, and the results are shown in Table 1.

[0037]

[Table 1] (Note 1) Figures in the split frame column are shown in Fig. 6 (b) 20a.
Indicates −, m / l is 0, is 0.2, is 0.4, and is 0.5. (Note 2) PP laminated in the configuration column indicates a prepreg laminated 6-layer plate configuration, and core laminated indicates a core laminated 6-layer plate.

[0038]

As described above, as the eyelet jig for driving the eyelet material, by providing a clearance between the split piece and the surface of the inner layer material to be fastened in the crimping operation stage, a multi-layer board having excellent interlayer position accuracy is obtained. It became possible to manufacture by the method. In addition, the method of the present invention makes it possible to adopt the eyelet method even in the core laminated multilayer board, which has been difficult to ensure practical accuracy. Further, the ratio (m / l) of the length l and the depth m of the opening of the spherical depression that cuts and presses the cut eyelet material end provided on the split piece of the eyelet jig in the eyelet jig is The use of 0.4 or less makes it possible to manufacture a multi-layer board (including core lamination) having further excellent interlayer positional accuracy. In particular, when the material of the eyelet material is copper, the life of the eyelet jig is extended, and the frequency of replacement of the eyelet jig is reduced, so that the productivity is increased. Further, by using an autoclave type vacuum press, the interlayer positional accuracy can be further improved.

As described above, the present invention provides a method for producing a multilayer board having excellent interlayer position accuracy by the eyelet method. By applying the eyelet method for producing a multilayer board, the lay-up workability is remarkably improved. The dent defects on the outer layer copper foil can be reduced, and the pin-pulling work is eliminated in the dismantling work after the press, and the workability is improved. In addition, the tolerance for changes in the thickness of the inner layer material is significantly improved, and the type of eyelet axial length is minimized, which is extremely advantageous for industrialization.

Furthermore, since the eyelet material is copper in the post-treatment step of the multilayer board after the production of the multilayer board by the eyelet method, when the surface of the substrate is polished, there is no influence of abrasion on the abrasive material. This brings an additional effect that there is no influence due to dissolution in a chemical solution when the substrate is plated with copper.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a conventional example.

FIG. 2 is a sectional view showing a stack of the above.

FIG. 3 is a partially omitted view showing a stack according to the present invention.

FIG. 4 is a perspective view of an eyelet material.

FIG. 5 is a schematic sectional view showing an application according to the present invention.

6A is a basic sectional view of a split piece, and FIG. 6B is a ratio m of the recess length l and the recess depth m of the split piece of the present invention.
Sectional view of the split piece with / l replaced by (c) Plan view of the split piece

7A is a sectional view showing a conventional eyelet process, FIG. 7B is a sectional view showing a conventional eyelet crimping process, and FIG. 7C is a sectional view showing a conventional eyelet material after completion of conventional eyelet crimping.

8A is a cross-sectional view showing the eyelet process of the present invention. FIG. 8B is a cross-sectional view showing the eyelet caulking work of the present invention. FIG. 8C is a cross-sectional view showing the eyelet material after completion of the eyelet caulking of the present invention.

FIG. 9 is a sectional view showing a description of a recess length l, a recess depth m, and a clearance g between the split piece and an inner layer material, and a specific example of a stopper.

FIG. 10 is a ratio m / l of a clearance value g between the split piece and the inner layer material to be fastened, a length l of the opening and a depression m of the opening.
Sectional drawing showing eyelet material after being crimped when the combination with the value is changed

FIG. 11 is an explanatory diagram for explaining a specific example in which a split piece is ground to change its shape.

[Explanation of symbols]

 1 Autoclave 2 Outer layer material 3 Prepreg 4 Inner layer material 5 Stacked body 6 Guide hole 7 Vacuum exhaust port 8 Mirror surface plate 9 Substrate 10 Mold 11 Film 12 Disperser 13 Breather sheet 14 Caulking eyelet hole 15 Guide pin 16 Eyelet material 17 Integrated molding Object 18 Eyelet jig 19 Receiving piece 19a Receiving piece pin 20 Split piece 20a Body 20b Blade-like protrusion 20c Depression 20d Split blade (ridge) 20e Central projection 21 Inner layer material 22 Depth end 23 Cylindrical shaft 24 Flange 25 Flange neck 26 Stopper 27 Split flange

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B32B 31/20 7148-4F B32B 31/20 // B29C 43/18 7365-4F B29C 43/18 43 / 20 7365-4F 43/20 B29K 105: 08 B29L 31:34

Claims (7)

[Claims] 1. A plurality of inner layer materials having wiring patterns formed on both front and back surfaces and a prepreg sandwiched between the inner layer materials, a guide hole and a crimping eyelet hole are provided in an outer frame portion, and the predetermined guide holes are provided. After stacking the pins vertically, insert the eyelet material consisting of the cylindrical portion and the flange portion into the crimping eyelet holes arranged at the predetermined positions of the inner layer material and the prepreg to form an integrally molded product, and form the outer layer copper on both sides. Laminated laminate,
In the step of caulking the eyelet material of the prepreg laminated multilayer board obtained by stacking copper foil and prepreg and heat-pressing, the surface of the inner layer material that is fastened by the eyelet material and the tip of the eyelet material of the eyelet jig that drives the eyelet material A prepreg laminated multi-layer board, characterized in that a clearance is provided between the split piece which is cut open and pushed and bent, and the bent tip of the eyelet material smoothly escapes the upper surface of the inner layer material to the outer periphery and spreads. Manufacturing method. 2. The method for producing a prepreg laminated multilayer board according to claim 1, wherein the eyelet material is copper. 3. The opening length 1 of a spherical recess that cuts open and bends the end of the eyelet material provided on the split piece of the eyelet jig for cutting out the eyelet material (when the eyelet shaft thickness is t, the shaft is broken and folded back). Generally, the ratio of 1> 2t) to the opening depth m (m
3. The method for producing a prepreg laminated multilayer board according to claim 1 or 2, wherein a split piece having a ratio of / l) of 0.4 or less is used. 4. The method for producing a prepreg laminated multilayer board according to claim 1, which is formed by using an autoclave type vacuum press. 5. A plurality of inner layer members each having a wiring pattern formed on the inner layer portion and a prepreg sandwiched between the inner layer members are provided with a guide hole and a caulking eyelet hole in an outer frame portion, and the predetermined guide holes are provided in the predetermined guide holes. After stacking the pins vertically, the inner layer material and the prepreg are arranged at predetermined positions, and the eyelet material including the cylindrical portion and the flange portion is inserted into the crimping eyelet hole to form an integrally molded product, which is obtained by heat and pressure molding. In the step of caulking the eyelet material of the core laminated multilayer board, a clearance is provided between the surface of the inner layer material that is fastened by the eyelet material and the split piece that opens and presses the eyelet material tip of the eyelet jig that drives the eyelet material. A method for manufacturing a core laminated multi-layer board, characterized in that the clearance is configured such that the bent tip of the eyelet material smoothly escapes the upper surface of the inner layer material and spreads to the outer periphery. 6. A ratio (m / l) of the opening length l (l> 2t) of the spherical recess that cuts and presses the end of the eyelet material provided on the split piece of the eyelet jig for opening the eyelet material to the opening m. )
6. The method for producing a core laminated multilayer board according to claim 5, wherein a split piece having a ratio of 0.4 or less is used. 7. The method for producing a core laminated multilayer plate according to claim 5, wherein an autoclave type vacuum press is used.