JP3721767B2 - Method for positioning metal foil-clad laminates - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for positioning a metal foil-clad laminate performed in the production of a metal foil-clad laminate and the like.
[0002]
[Prior art]
A metal foil-clad laminate used in the production of printed wiring boards is prepared by, for example, impregnating a base material such as glass cloth with a thermosetting resin composition such as an epoxy resin, and then drying and semi-curing the prepreg. As shown in FIG. 2, the required number of the prepregs 12 are stacked, and a metal foil 13 such as a copper foil is disposed on the outside to form a pressure-bonded body 14, and then the pressure-bonded body 14 is formed. It is manufactured by sandwiching between press plates 22 and 22 of the press 20 and heating and pressurizing. In order to improve productivity, a plurality of members 14 and 14 are stacked with a flat plate 16 made of metal or the like interposed therebetween, and the stacked body 10 is pressed by pressure plates 22 and 22 of a molding press 20. In general, a method of obtaining a large number of metal foil-clad laminates by heating and pressurizing them between them is generally performed.
[0003]
In general, the size of the prepreg 12 used for manufacturing the laminated plate is slightly larger than the size of the laminated plate to be obtained. The metal foil 13 disposed outside the prepreg 12 is larger than the prepreg 12 in order to prevent the resin flowing out from the prepreg 12 during heating and pressurization from adhering to the pressurization plate 22 and the flat plate 16. Generally used.
[0004]
And when these prepregs 12 and metal foils 13 and the like are stacked, after placing the prepregs 12 almost at the center of the metal foils 13 so that the prepregs 12 do not protrude laterally outside the metal foils 13, A metal foil 13 is overlaid on the prepreg 12 so as to protrude outward from the side of the prepreg 12 so that the resin flowing out during heating and pressurization is prevented from adhering to the pressure plate 22 or the like.
[0005]
And after bonding the prepreg 12 and the metal foil 13 by heating and pressurizing, the metal foil-clad laminate obtained by the bonding is cut at a portion slightly inside the four sides where the base is present, and the end portion is cut The metal foil-clad laminate is manufactured by cutting off. In addition, when cutting off at the portion where the substrate is present, it is necessary to position the portion to be cut off on a cutting machine. As a positioning method, as shown in FIG. 5 (a), a metal foil obtained by bonding In general, a method of pressing one end surface or two end surfaces of the tension laminate 1 against the guide roller 35 is performed. And after positioning, the method of cutting off an edge part is performed by cut | disconnecting in the direction parallel to the direction of the line which connects between the guide rollers 35 and 35 in the part with the base material of the prepreg 12 (in the figure,). A shows a cutting line).
[0006]
However, when positioning by the method of pressing against the guide roller 35, there is a case where the position to be cut and the position to be actually positioned and cut may be shifted due to variations in the amount of resin that flows out during heating and pressurization. was there. As shown in FIG. 5B, the metal foil 13 portion where the resin 36 did not flow out has a lower strength than the portion where the resin 36 is present. Since the foil 13 is bent and hits the guide roller 35 at a portion where the resin 36 is hardened, the amount of the resin 36 that flows out varies within the one end surface of the prepreg 12, and the portion C has a large amount of the resin 36 that flows out. This is because when the portion D where the amount of the resin 36 that has flowed out is a small portion D is positioned by hitting the guide roller 35, a large deviation occurs between the direction of the end surface B of the prepreg and the direction of the cutting line A.
[0007]
Therefore, for example, as described in JP-A-60-199649, a method of forming a reference mark on the surface of the laminated plate with a stamp or the like and then positioning using the reference mark has been studied. However, in this method, a process for forming the reference mark is required, so that the productivity is lowered, and if the position of the reference mark is shifted, the position to be cut is actually positioned. There has been a problem that the cutting position may shift. Therefore, there is a need for a method for positioning a metal foil-clad laminate capable of positioning with excellent positioning accuracy.
[0008]
[Problems to be solved by the invention]
The present invention has been made in order to improve the above-mentioned problems. The object of the present invention is to form a prepreg composed of a thermosetting resin composition and a base material, a metal foil, and a flat plate. A method for positioning a metal foil-clad laminate for positioning a metal foil-clad laminate produced by heating and pressurizing the laminated body, which is capable of positioning with excellent positioning accuracy. It is to provide.
[0009]
[Means for Solving the Problems]
In the positioning method for a metal foil-clad laminate according to claim 1 of the present invention, a metal foil is disposed on at least one outer side of a prepreg composed of a thermosetting resin composition and a base material and a metal foil. A metal foil-clad laminate produced by heating and pressurizing the laminate to form a laminate by stacking a plurality of workpieces stacked on a flat plate, and a reference mark formed on the surface of the laminate In the positioning method of the metal foil-clad laminate that is positioned using the prepreg, the metal foil, and the flat plate, the method of overlapping the prepreg, the metal foil, and the flat plate is such that the metal foil and the flat plate protrude laterally outward from the prepreg. And the method of positioning using the reference mark is a method of recognizing and positioning the unevenness corresponding to the end surface of the prepreg that is raised on the surface of the metal foil.
[0010]
The method for positioning a metal foil-clad laminate according to claim 2 of the present invention is the method for positioning a metal foil-clad laminate according to claim 1, wherein the method for recognizing irregularities irradiates light linearly. The optical marker formed in this way is positioned by matching the position where the irregularities are recognized.
[0011]
The method for positioning a metal foil-clad laminate according to claim 3 of the present invention is the method for positioning a metal foil-clad laminate according to claim 2, wherein the method of aligning the positions where irregularities are recognized with the optical marker is optical. Two markers are provided perpendicular to each other, and the unevenness corresponding to the end face of the prepreg is matched with one optical marker, and the other optical marker is previously formed on the metal foil on the surface of the metal foil-clad laminate. It is a method for matching marks.
[0012]
A metal foil-clad laminate positioning method according to claim 4 of the present invention is the metal foil-clad laminate positioning method according to any one of claims 1 to 3, wherein the method of heating the laminate is a metal The method is characterized in that a voltage is applied to the foil and heating is performed by resistance heating.
[0013]
According to the present invention, positioning is performed using unevenness corresponding to the end face of the prepreg that is raised on the surface of the metal foil, so that positioning can be performed without being affected by variations in the amount of resin that flows out when heated and pressurized. Positioning with excellent accuracy is possible.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
A method for positioning a metal foil-clad laminate according to the present invention will be described with reference to the drawings. FIG. 1 is a plan view for explaining an embodiment of a method for positioning a metal foil-clad laminate according to the present invention, and FIG. 2 explains an embodiment of a method for positioning a metal foil-clad laminate according to the present invention. FIG. 3 is a plan view for explaining another embodiment of the method for positioning a metal foil-clad laminate according to the present invention, and FIG. 4 shows still another method for positioning the metal foil-clad laminate according to the present invention. It is a top view explaining embodiment.
[0015]
As shown in FIG. 2, one embodiment of the method for positioning a metal foil-clad laminate according to the present invention is a stack of prepregs 12 and metal foils 13 so that the metal foils 13 are arranged on both outer sides. The laminated body 10 is formed by laminating a plurality of the pressure-bonded bodies 14 sandwiched between the flat plates 16, and then the laminated body 10 is sandwiched between the pressure plates 22 and 22 of the molding press 20, heated and pressurized, and the prepreg 12 In this embodiment, a metal foil-clad laminate produced by bonding metal foils 13 is positioned.
[0016]
In addition, the method of overlapping the prepreg 12, the metal foil 13, and the flat plate 16 is a method of stacking the prepreg 12, the metal foil 13, and the flat plate 16 so that the metal foil 13 and the flat plate 16 protrude outward from the prepreg 12. It is important to be. When overlapped in this way, irregularities appear to be raised at a portion corresponding to the end face of the prepreg 12 on the surface of the metal foil 13. This is because, among the metal foil-clad laminate produced by bonding, the portion corresponding to the end face of the prepreg 12 is one of the base material and the resin cured product, and the other is the boundary of the resin cured product only. Since the portion of the resin-cured material alone without the material is slightly thinner than the base material and the resin-cured material portion, irregularities are formed at the boundary portion.
[0017]
And when positioning this metal foil clad laminated board, as shown to Fig.1 (a), after irradiating light linearly from the light source 32 and forming the linear optical marker 30, metal foil is formed. Recognizing the unevenness 2 corresponding to the end face of the prepreg that has been raised on the surface of the metal foil 13 of the laminated laminate 1, then, as shown in FIG. 1 (b), the unevenness 2 corresponding to the recognized end face of the prepreg, The optical marker 30 is positioned so as to substantially match. Since positioning is performed using the unevenness 2 corresponding to the end surface of the prepreg, positioning can be performed without being affected by variations in the amount of resin that flows when heated and pressurized, and positioning with excellent positioning accuracy is possible.
[0018]
Examples of the method for forming the optical marker 30 include a method of irradiating light with high directivity such as laser light, a method of irradiating light through a shielding plate having a slit, and the like. Instead of the optical marker 30, a linear marker is formed on a transparent plate, and a metal foil-clad laminate 1 is inserted under the transparent plate so that the unevenness 2 corresponding to the end face of the marker and the prepreg is matched. You may position by the method of making it. Note that when the optical marker 30 is used, the light source 32 can be installed at a slightly separated position, so that there are few obstacles when positioning the metal foil-clad laminate 1, and workability is excellent.
[0019]
Further, the optical marker 30 or the marker formed on the transparent plate may be formed by a single line and positioned so that the unevenness 2 corresponding to the end surface of the prepreg coincides with the two lines. And positioning may be performed such that the unevenness 2 corresponding to the end face of the prepreg is disposed between the lines.
[0020]
As shown in FIG. 3A, light is linearly emitted from the two light sources 32 to provide two linear optical markers 30a and 30b orthogonally, and then the surface of the metal foil 13 is provided. Recognize the irregularities 2a and 2b corresponding to the two end faces of the prepreg that has been raised, and then, as shown in FIG. 3B, the irregularities 2a corresponding to one of the end faces of the prepreg are formed on one optical marker 30a. The positioning may be performed by substantially matching, and the other optical marker 30b may be positioned by substantially matching the unevenness 2b corresponding to the end surface orthogonal to the one surface among the end surfaces of the prepreg. In this case, the metal foil-clad laminate 1 can be positioned simultaneously in the vertical and horizontal directions, and positioning with excellent productivity is possible.
[0021]
Further, when the metal foil-clad laminate is positioned simultaneously in the vertical and horizontal directions, as shown in FIG. 4 (a), a mark 34 is previously formed on the metal foil 13 on the surface of the metal foil-clad laminate with a stamp or the like. After linearly irradiating light from the two light sources 32 and providing two linear optical markers 30a and 30b orthogonally, the unevenness 2 corresponding to the end surface of the prepreg that has been raised on the surface of the metal foil 13 is formed. As shown in FIG. 4B, the concave and convex portions 2 corresponding to the end faces of the prepreg are positioned so as to substantially coincide with one optical marker 30a, and the alignment mark 34 is placed on the other optical marker 30b. Positioning may be performed by substantially matching. In the case of this method, the workability when the alignment mark 34 is substantially matched with the optical marker 30b is superior to the workability when the unevenness 2 corresponding to the end surface of the prepreg is substantially matched. Positioning with excellent productivity is possible.
[0022]
The prepreg 12 used in the present invention is composed of a thermosetting resin composition and a substrate. For example, after adjusting the viscosity by adding a solvent to the thermosetting resin composition, the substrate is immersed in the liquid. Impregnated and then heated to dry the solvent and semi-cure the thermosetting resin composition, or a base material in a state where the solid thermosetting resin composition is heated and melted at room temperature It is obtained by applying to and impregnating. The thermosetting resin composition in the prepreg 12 is limited to a semi-cured (B stage) state.
[0023]
As the substrate, inorganic fibers such as glass, organic fibers such as polyester, polyamide, polyacryl, and polyimide, and natural fibers such as cotton, woven fabric, nonwoven fabric, and paper can be used. Use of glass fiber woven fabric (glass cloth) is preferable because a metal foil-clad laminate having excellent heat resistance and moisture resistance can be obtained. In general, a substrate having a thickness of 0.04 to 0.30 mm is used.
[0024]
In addition, as the thermosetting resin composition, an epoxy resin type, a phenol resin type, a polyimide resin type, an unsaturated polyester resin type, a polyphenylene ether resin type or the like alone, a modified product, a mixture, a thermosetting resin, etc. The entire composition can be used. In addition, when a thermosetting resin composition is an epoxy resin type | system | group, the balance of an electrical property and adhesiveness is favorable and preferable.
[0025]
The thermosetting resin composition contains a thermosetting resin as an essential component, and can contain a curing agent, a curing accelerator, an inorganic filler, a solvent, and the like of the thermosetting resin as necessary. . Note that a thermosetting resin composition having a low self-curing property such as an epoxy resin needs to contain a curing agent for curing the resin.
[0026]
The amount of the thermosetting resin composition in the prepreg 12 is preferably 40 to 70 parts by weight with respect to 100 parts by weight of the total weight of the thermosetting resin composition and the substrate. When the amount is less than 40 parts by weight, bubbles may remain inside the obtained metal foil-clad laminate and the electrical characteristics may deteriorate. When the amount exceeds 70 parts by weight, the resulting metal foil-clad laminate is obtained. The thickness variation may become large.
[0027]
Moreover, as metal foil 13 used for this invention, if it is metal foil, it will not specifically limit, Single, alloy, and composite foil, such as copper, aluminum, brass, nickel, can be used. The thickness of the metal foil 13 is generally 5 to 70 μm. In addition, the metal foil 13 should just be arrange | positioned on the outer side of at least one of the to-be-bonded bodies 14. In the case of being disposed only on one outer side, a release sheet such as a fluororesin film is generally disposed on the other outer side, and when such a pressure-bonded body 14 is heated and pressed, a single-sided metal foil-clad laminate is obtained. be able to.
[0028]
Moreover, as the flat plate 16 used for this invention, the thing which insulated the surface of metal plates, such as iron and stainless steel, or these metal plates is mentioned.
[0029]
It should be noted that an inner layer substrate on which a conductor circuit is formed may be sandwiched between the members to be bonded 14. When such a member to be bonded 14 is heated and pressurized, a metal foil-clad laminate with an inner layer circuit can be obtained. The inner layer substrate is not particularly limited as long as it is a plate on which a conductor circuit is formed. For example, epoxy resin, phenol resin, polyimide resin, unsaturated polyester resin, polyphenylene ether resin, etc. The above-mentioned thermosetting resin, base plate such as glass, inorganic fiber such as glass, organic fiber cloth such as polyester, polyamide, cotton, paper, etc. A board formed with a conductor circuit on a plate bonded with resin or the like can be used.
[0030]
In addition, as a method of heating and pressurizing the laminated body 10 between the pressurizing plates 22 and 22, a method of heating the pressurizing plate 22 by heat transfer from the pressurizing plate 22, or supplying power to the metal foil 13. And heating by resistance heating. Note that resistance heating is a method in which power is supplied to a conductor having electrical resistance and heated by heat generated by the Joule effect. What is necessary is just to adjust suitably as conditions for this heating so that it may become the temperature which the thermosetting resin composition in the prepreg 12 hardens | cures. In addition, when the method of heating the laminated body 10 is a method of applying a voltage to the metal foil 13 and heating by resistance heating, the surface of the metal foil 13 of the obtained metal foil-clad laminate 1 corresponds to the end face of the prepreg. Since the unevenness 2 to be raised is easily raised, the unevenness 2 is easily recognized, and workability is excellent.
[0031]
In addition, when sandwiching the laminated body 10 between the pressurization boards 22 and 22, even if it heats and presses with cushion materials, such as a cellulose paper and an aramid fiber paper, a heat conduction adjusting material, etc. between them, as needed. Good.
[0032]
In the above embodiment, the prepreg 12, the metal foil 13, and the flat plate 16 are overlapped with the prepreg 12 so that the metal foil 13 and the flat plate 16 protrude from both sides of the prepreg 12. Although the embodiment in which the metal foil 13 and the flat plate 16 are stacked has been described, it is not limited to stacking so that the four sides protrude, and at least the unevenness 2 corresponding to the end surface of the prepreg that is raised on the surface of the metal foil 13. It is only necessary that the metal foil 13 and the flat plate 16 protrude from the side of the prepreg 12 to the side outside only the side that is to be recognized. It should be noted that it is preferable to stack the four sides so that they protrude from each other because the effect of preventing the resin flowing out during heating and pressurization from adhering to the pressurizing plate 22 and the like is great.
[0033]
【The invention's effect】
The positioning method of the metal foil-clad laminate according to the present invention recognizes and positions the unevenness corresponding to the end surface of the prepreg that is raised on the surface of the metal foil of the metal foil-clad laminate, so that positioning with excellent positioning accuracy is possible. It becomes.
[0034]
The positioning method of the metal foil-clad laminate according to claim 2 of the present invention enables positioning with excellent workability in addition to the above effects.
[0035]
The positioning method of the metal foil-clad laminate according to claim 3 of the present invention enables the metal foil-clad laminate to be positioned simultaneously in the vertical and horizontal directions in addition to the above effects, and positioning with excellent productivity is possible.
[Brief description of the drawings]
FIG. 1 is a plan view for explaining an embodiment of a method for positioning a metal foil-clad laminate according to the present invention.
FIG. 2 is an exploded sectional view for explaining an embodiment of a method for positioning a metal foil-clad laminate according to the present invention.
FIG. 3 is a plan view for explaining another embodiment of a method for positioning a metal foil-clad laminate according to the present invention.
FIG. 4 is a plan view for explaining still another embodiment of a method for positioning a metal foil-clad laminate according to the present invention.
5A and 5B are diagrams for explaining a conventional method for positioning a metal foil-clad laminate, where FIG. 5A is a plan view, and FIG. 5B is an enlarged plan view of a main part.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Metal foil clad laminated board 2, 2a, 2b Concavity and convexity 10 Laminate body 12 Pre-preg 13 Metal foil 14 Bonded body 16 Flat plate 20 Forming press 22 Pressure board 30, 30a, 30b Optical marker 32 Light source 34 Alignment mark 35 Guide roller 36 Resin A Cutting line B End face C of prepreg Part with a large amount of resin flowing out D Part with a small amount of resin flowing out

Claims (4)

A laminated body is formed by stacking a plurality of press-bonded bodies in which a metal foil is placed on at least one outer side of a prepreg composed of a thermosetting resin composition and a base material and sandwiched between flat plates. In the positioning method of the metal foil-clad laminate, the metal foil-clad laminate produced by heating and pressurizing the laminate is formed using a reference mark formed on the surface of the laminate,
The method of stacking the prepreg, the metal foil, and the flat plate is a method of stacking the prepreg, the metal foil, and the flat plate so that the metal foil and the flat plate protrude outward from the prepreg, and a method of positioning using a reference mark. Is a method for recognizing and positioning irregularities corresponding to the end face of the prepreg that is raised on the surface of the metal foil. 2. The method according to claim 1, wherein the method of recognizing and positioning the unevenness is a method of positioning by aligning the position where the unevenness is recognized with an optical marker formed by linearly irradiating light. A method for positioning a metal foil-clad laminate. The method of matching the position where the unevenness is recognized with the optical marker is provided by arranging two optical markers orthogonally so that the unevenness corresponding to the end surface of the prepreg is matched with one optical marker, and the other optical marker 3. The method for positioning a metal foil-clad laminate according to claim 2, wherein the alignment mark formed in advance on the metal foil on the surface of the metal foil-clad laminate is matched. The method of positioning a metal foil-clad laminate according to any one of claims 1 to 3, wherein the method of heating the laminate is a method of applying a voltage to the metal foil and heating by resistance heating. .

Images