JPS625312Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laminate, and more particularly to a copper-clad laminate having fibers in an insulating board used for printed wiring boards or the like having directionality.

Conventionally, copper-clad laminates have been known as synthetic resin laminates containing cloth substrates used for printed wiring boards, etc., and therefore, copper-clad laminates will be described below as an example. As shown in FIG. 1, this has a structure in which a cloth base synthetic resin 2 is sandwiched between copper foils 1 and 1'. As the cloth-based synthetic resin 2, an epoxy resin based on glass fiber cloth is usually widely used due to its excellent cost performance. Figure 2 is a diagram showing the configuration of a case where epoxy resin is used as a glass fiber cloth base material.In order to provide the desired thickness between copper foils 1 and 1', multiple glass cloth bases containing epoxy resin are used in the glass fiber cloth. Materials 2a to 2n are arranged.

The copper-clad laminates in Figure 1 are copper foils 1 and 1' in Figure 2.
It is manufactured using the adhesive effect of epoxy resin by thermocompression bonding from both sides. In this case, as shown in the enlarged view of FIG. 3, the glass fiber cloth base materials 2a to 2n in FIG. The cloth 5 contains epoxy resin. FIG. 4 is a schematic illustration of a woven fabric for forming the glass cloth of FIG. 3. Stretched longitudinal glass fiber 3 (3a
and 3b) shows a process in which a glass cloth 5 is woven by passing horizontal glass fibers 4 alternately in a wavy manner. The glass cloth base material 2a in FIG.
2n is the mechanical strength and physical properties of the copper-clad laminate;
Although it is used to improve and maintain electrical properties, the longitudinal glass fibers 3 and the transverse glass fibers 4 shown in Fig. 4 have slight differences in dimensional expansion/contraction, mechanical strength, and warping characteristics depending on the direction. When designing a product such as a printed wiring board using the copper-clad laminate shown in FIG. 1, it is necessary to take this fiber direction into consideration. In general, when the copper-clad laminate shown in FIG. 1 uses a woven glass cloth 5 as shown in FIG. , is known to have excellent warpage characteristics. For this reason, the copper-clad laminate shown in FIG.
As shown in FIG.
At the top is the abbreviated symbol for the laminate manufacturer (in this case NEC), with a predetermined symbol shape and symbol orientation that corresponds to the fiber direction (length or width)6
are printed at regular intervals using colored ink or the like. The fiber direction of the copper-clad laminate shown in Figure 1 is determined by the fact that when the copper foils 1 and 1' are selectively removed during pattern formation during printed wiring board manufacturing, symbol 6 is seen through the translucent epoxy resin from the outside. Since the relationship between the direction of the symbol 6 and the glass fiber direction is determined in advance as described above, the fiber direction can be determined. Referring to FIG. 5, the direction in which the symbol 6 "NEC" can be read correctly matches the direction of the longitudinal glass fibers 3. However, with the conventional means for determining the fiber direction, (a) In a copper-clad laminate as shown in FIG. 1, since the copper foils 1 and 1' are stretched, it is not possible to see through the inside from the outside. Therefore, the fiber direction cannot be known until the copper foil is selectively removed during pattern formation or the like during the manufacture of printed wiring boards.

(b) Even if you inspect the cloth-based synthetic resin 2 on the fractured surface of a copper-clad laminate as shown in Figure 1, there is a chance that a part of the printed symbol 6 will be exposed from both directions (vertically or horizontally). Unable to know fiber direction. Due to such reasons, there is a lack of means to determine the fiber direction before manufacturing printed wiring boards, etc., and when manufacturing printed wiring boards, etc., the vertical or horizontal direction of copper-clad laminates may be confused and must be discarded during the manufacturing process. resulting in higher costs, longer construction times,
There were serious defects that caused quality problems.

The object of the present invention is to provide a copper-clad laminate that overcomes the above-mentioned drawbacks of the prior art.

That is, according to the present invention, in a laminate having a cloth made of woven fibers inside an insulating layer, the first layer in either the longitudinal direction or the transverse direction of the cloth is provided.
A laminate is obtained, which has a cloth inside the insulating layer, in which second fibers of a color different from the first fibers are woven in an arrangement at predetermined intervals.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 6 to 8, taking a copper-clad laminate as an example.

Figure 6 shows the glass cloth base material 7 in the process of implementing the present invention.
a, 7n, in which a second glass fiber 8 continuously colored in a color different from that of the first longitudinal glass fiber 3 and the transverse glass fiber 4 is placed in a group of three longitudinal glass fibers. They are arranged at a predetermined interval P. The glass cloth base materials 7a and 7n in FIG. 6 correspond to the glass cloth base materials 2a and 2n in FIG. 2, which are made by adding an epoxy resin to the glass cloth 5 of FIG. 5, which is a conventional copper-clad laminate. , in particular, the longitudinal glass fibers 3 and the transverse glass fibers 4 of FIG. 6 are respectively the longitudinal glass fibers 3 of FIG.
and the transverse glass fibers 4 and colors are equivalent. The colored glass fibers 8 of the glass cloth base materials 7a and 7n in FIG. 6 are produced by automatically applying colored paint to the longitudinal glass fibers 3 at predetermined intervals P during weaving as shown in FIG. This can be achieved through integrated work with cloth.

Next, the glass cloth base materials 7a, 7n shown in FIG. 6 are replaced with the glass cloth base materials 2a, 2n shown in the configuration diagram of FIG. The copper-clad laminate of the present invention can be completed.

According to the copper-clad laminate shown in FIG. 7, the cross sections of the longitudinal glass fibers 3 and the colored glass fibers 8 of the glass cloth base materials 7a and 7n are exposed at the longitudinal fracture surface 9, so that each interval dimension P is Different hues can be observed. In addition, the glass cloth base material 2b with the same fracture surface 9
~2m has the same hue as the longitudinal glass fiber 3, so the longitudinal fracture surface 9 is the fracture surface of the glass fiber 8 colored only in the rows of the glass cloth substrates 7a and 7n nearest to the copper foils 1 and 1'. It can be observed in a different hue from the surroundings for each interval dimension P. On the other hand, the lateral fracture surface 10
In, glass cloth base materials 7a, 7n, 2b to 2m
Since the fractured surface of the horizontal glass fiber 4 is exposed, it can be observed uniformly in the same color, or the horizontal fracture surface 10 can be observed by dividing the vertical glass fiber 8 in the horizontal direction.
The glass cloth base materials 7a and 7n can be observed in a linearly colored state, and in any case, it can be clearly determined whether the fractured surface is in the vertical direction or the horizontal direction. This means that no matter where the copper-clad laminate shown in FIG. 7 is cut in the vertical or horizontal direction, it is possible to determine which side it is by observing the fractured surface. In addition, the copper foil 1 of the copper-clad laminate shown in Figure 7
Even if 1' and 1' are removed during the manufacturing process of printed wiring boards, the colored glass fibers 8 can be seen through the semi-transparent epoxy resin, unlike the conventional 5th glass fiber.
This method provides a clearer method of determining the fiber direction than the method of determining the fiber direction based on the direction indicated by symbol 6 in the figure.

The copper-clad laminate shown in FIG. 8 has the glass cloth base material 7a of the copper-clad laminate shown in FIG. 7 replaced with one of the glass cloth base materials 2b to 2m shown in the configuration diagram of FIG. The fiber direction can be determined by observing the fracture surfaces 9 and 10 as in FIG. Moreover, the glass cloth base material 7a of FIG. 6 is replaced with the glass cloth base material 2a of FIG.
It is also possible to replace and arrange some of 2n. The selection of the interval dimension P for arranging the colored glass fibers 8 in the longitudinal glass fibers 3 of the glass cloth substrates 7a, 7n of FIG. 6 used in the copper-clad laminates of FIGS. This can easily be done by adjusting the weaving process as shown in the figure, and if this interval dimension P is determined in advance by each laminate manufacturer, it can be easily determined by simply observing the fractured surface 9 of the copper-clad laminate shown in Fig. 7 or 8. The laminate manufacturer can be identified, and there is no need to print the laminate manufacturer's symbol 6 in FIG. 5. Furthermore, the color of the colored glass fibers 8 in Figure 6 can be any color as long as a coloring paint is selected, and those with a flame-retardant structure such as ordinary copper-clad laminates can be colored with the symbols in Figure 5. 6 is used in red, the colored glass fiber 8 in FIG. 6 may be colored red.

In the glass cloth base materials 7a and 7n shown in FIG. 6, colored glass fibers 8 are arranged in the vertical glass fibers 3, but colored glass fibers 8 are arranged in the horizontal glass fibers 4, The fiber direction may be determined by observing the fracture surface in the transverse direction 10 of the copper-clad laminate shown in FIG. Furthermore, even if the copper foils 1 and 1' in FIG. 7 are made of different metals, or the glass cloth base material 7a is woven with different fibers and contains a synthetic resin other than epoxy resin, the same problem will not occur. Needless to say.

As is clear from the examples, (i) the fiber direction of the present invention can be determined by observing the fractured surface from the outside without removing the copper foil of the copper-clad laminate.

(ii) No matter where the copper-clad laminate is cut in the vertical or horizontal direction, the fiber direction can be determined by observing the fractured surface from the outside.

Because printed wiring boards and the like are not discarded during the manufacturing process or after completion, problems such as increased costs, extended construction periods, and quality problems can be solved all at once, and the effect is extremely large.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional copper-clad laminate;
Fig. 2 is a perspective view of the structure shown in Fig. 1, Fig. 3 is an enlarged perspective view of a conventional glass fiber cloth, Fig. 4 is a schematic diagram of the woven fabric of Fig. 3, and Fig. 5 is a conventional glass fiber cloth. FIG. 6 is a plan view of a glass cloth substrate according to an embodiment of the present invention, and FIGS. 7 and 8 are perspective views of a copper-clad laminate according to an embodiment of the present invention. 1,1'...Copper foil, 2...Fabric base synthetic resin, 2
a-2n, 7a-7n...Glass cloth base material (epoxy resin included), 3, 3a, 3b...Longitudinal glass fiber, 4...Horizontal glass fiber, 5...Glass cloth, 6...Symbol, 8...Colored glass fiber, 9
...Longitudinal fracture surface, 10...Transverse fracture surface, P...
...Spacing dimension.

Claims (1)

[Scope of utility model registration request] In a laminate having a cloth made of woven fibers inside the insulating layer, the first fibers in either the longitudinal direction or the transverse direction of the cloth have a color different from that of the first fibers. A laminate comprising, within an insulating layer, a cloth woven with second fibers arranged at predetermined intervals.