JPH0766510A - Printed-wiring board - Google Patents

Abstract

PURPOSE:To enable the connecting parts of respective connecting pieces to be cut off very easily by a method wherein the first and second connecting parts are composed to be alternately arranged at the end faces of the first and second circuit substrates. CONSTITUTION:Within the printed-wiring board P fundamentally composed of two circuit substrates 1, 2 mutually connected through the intermediary of plural connecting pieces 3, 4, 5, L-type cut off trenches C are provided between respective substrates 1 and 2 by respective connecting pieces 3, 4, 5. At this time, both end parts of respective connecting pieces 3, 4, 5 are provided with wide connecting parts 3A, 4A, 5A and narrow connecting parts 3B, 4B, 5B so as to connect respective circuit substrates 1 and 2 through the intermediary of respective connecting parts 3A, 3B, 4A, 4B, 5A, 5B of respective connecting pieces 3, 4, 5. Accordingly, the stress imposed by the deflection of the circuit substrates 1, 2 may be dispersed extending over the whole part of respective connecting parts while the wide connecting parts are respectively formed of holes 6, 7, 8 so that the connecting strength of respective circuit substrates may be conserved at a level exceeding a specific value simultaneously facilitating the cutting off step thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a printed wiring board in which two circuit boards are connected to each other through a plurality of connecting pieces, and the individual connecting boards can be removed by removing the connecting pieces. Regarding the board, especially by improving the connection strength between each connecting piece and each circuit board, the connecting piece can be handled easily and the occurrence of defective products can be reduced when the printed wiring board is handled. Printed wiring board.

[0002]

2. Description of the Related Art Conventionally, two or more circuit boards are formed on one printed wiring board and each circuit is formed in order to increase the efficiency of circuit board manufacturing in accordance with the miniaturization and high functionality of various electronic devices. It is possible to obtain each circuit board independently by connecting the boards to each other through a plurality of connecting pieces and deleting each connecting piece from the printed wiring board when obtaining each circuit board. Various printed wiring boards have been proposed.

As this type of printed wiring board, for example, in the specification and the drawings attached to the application of Japanese Patent Application No. 5-154445, two wiring boards are connected to each other through a plurality of connecting pieces. In particular, in FIG. 4, when connecting two wiring boards to be products with each connecting piece, the two end portions of each connecting piece and the end surface of each wiring board are described. A printed wiring board in which the width of the connecting portion is narrowed is described. In this way, the two wiring boards are connected to each other through the narrow connecting portion in consideration of the fact that both wiring boards are used as products and the easiness of cutting the connecting portion. is there. In such a printed wiring board, two wiring boards are obtained by cutting the connecting portion between each connecting piece and each wiring board with a cutting tool such as a nipper.

[0004]

However, when the two wiring boards are connected to each other through the narrow connecting portions at both ends of each connecting piece as described above, the connecting strength of the connecting portions is increased. Since the printed wiring board becomes weak, there is a possibility that the printed wiring board is inadvertently broken at each of the narrow connecting portions. If the connection parts are broken in this way, it becomes difficult to handle the printed wiring board.
Moreover, there is a risk that each wiring board will be defective.

The present invention has been made in order to solve the above-mentioned conventional problems, and improves the connection strength between each connecting piece and each circuit board to inadvertently break the connecting piece when handling a printed wiring board. It is an object of the present invention to provide a printed wiring board that can be handled easily and can reduce the occurrence of defective products without being damaged, and can cut the connecting portion of each connecting piece extremely easily.

[0006]

In order to achieve the above object, the invention according to claim 1 is at least two first and second inventions.
A print that can obtain each circuit board by forming a plurality of connecting pieces between the end faces where the circuit boards face each other, connecting the circuit boards to each other via each connecting piece, and deleting each connecting piece The wiring board has a first connecting portion formed at one end of each connecting piece with a predetermined width, and a second connecting portion formed at the other end of each connecting piece and narrower than the first connecting portion. The first and second circuit boards are connected to each other through the first and second connecting parts of the connecting pieces, and the first and second connecting parts are the first and second circuit boards. Are arranged alternately on the end faces of the. Further, in the invention according to claim 2, a hole is formed in the first connecting portion.

Further, in the invention according to claim 3, a plurality of connecting pieces are formed between end surfaces of at least two circuit boards facing each other, and the respective circuit boards are connected to each other through the connecting pieces. In a printed wiring board in which each circuit board can be obtained by deleting each connecting piece, connecting portions having the same width are formed at both ends of each connecting piece, and holes formed in each connecting portion. And is configured to include.

[0008]

In the printed wiring board according to the present invention having the above structure, each of the first and second circuit boards is formed with a predetermined width at one end of each of the plurality of connecting pieces.
The connecting portion and the second connecting portion, which is formed at the other end of each connecting piece and is narrower than the first connecting portion, are connected to each other, and
Since the first and second connecting portions are alternately arranged on the end surfaces of the first and second circuit boards, when the printed wiring board is handled, the first and second circuit boards are arranged between the first and second circuit boards. Thus, the stress applied to each connecting piece can be dispersed over the entire first connecting portion and the second connecting portion, and can be prevented from being concentrated only on the narrow second connecting portion. As a result, the connection strength between each connecting piece and each first and second circuit board is improved, and the printed wiring board can be easily handled without accidentally breaking the connecting piece when handling the printed wiring board. Becomes Also,
When obtaining the first and second circuit boards from the printed wiring board, the first connecting portion and the second connecting portion of each connecting piece are cut to remove each connecting piece. At this time, Since holes are formed in the wide first connecting portions and the second connecting portions are formed in a narrow width, the first connecting portions, the second connecting portions
The connection can be cut very easily.

In the printed wiring board according to the third aspect of the present invention, the connecting portions having the same width are formed at both ends of each of the plurality of connecting pieces for connecting the two circuit boards to each other. At the same time, since holes are formed in each connection part, the stress applied to each connection piece between each circuit board when handling the printed wiring board is evenly distributed over each connection part. To be done. As a result, the connection strength between each connecting piece and each circuit board is relatively improved, and the printed wiring board can be easily handled without accidentally breaking the connecting piece when handling the printed wiring board. . Further, when the two respective circuit boards are obtained from the printed wiring board, the connecting portions of the connecting pieces are cut and the connecting pieces are removed. At this time, holes are formed in the connecting portions. Therefore, the cutting of each connecting portion can be performed very easily.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A detailed description will be given below of an embodiment embodying the present invention with reference to the drawings. First, the first of the present invention
An embodiment will be described with reference to FIGS. Here, FIG. 1 is a plan view showing a connection state of two circuit boards in a printed wiring board, FIG. 2 is an explanatory view showing a dimensional relationship between a connection piece and its periphery, and FIG. 3 is a view showing connection between two circuit boards. FIG. 4 is a plan view of each circuit board in a released state, and FIG. 4 is a plan view of the circuit board in a state in which a connecting piece is removed from one circuit board in which the connection is released.

In FIG. 1, a printed wiring board P is made of a copper-clad heat-resistant glass epoxy board (board thickness: 1.6 mm), and basically has a plurality of two circuit boards 1 and 2 (three shown in FIG. 1). ) Are connected to each other via connecting pieces 3, 4, and 5. Each connection board 3, 4 and 5 connects each circuit board 1,
An L-shaped cutting groove C is provided between the two.

The cutting groove C is formed by cutting the printed wiring board P using a router having a die with a diameter of 1 mm attached to an NC cutter, and at the same time as forming such a cutting groove C. , Circuit board 1,
2. The connecting pieces 3, 4, 5 are formed in the printed wiring board P in a predetermined shape (see FIG. 1). Since it is known that the printed wiring board P is cut using a router, its description is omitted here.

The connecting pieces 3, 4, formed as described above,
5 is a wide connecting portion 3A, 4A, 5 at each end.
A and connecting portions 3B, 4B, 5B narrower than the connecting portions 3A, 4A, 5A are provided, and the connecting portions 3A, 3B, 4A in the connecting pieces 3, 4, 5 are provided. Four
The respective circuit boards 1 and 2 are connected to each other via B, 5A, and 5B.

Here, the wide connecting portion 3A of the connecting piece 3 is connected to the end surface of the circuit board 1 (the left end surface in FIG. 1), and the narrow connecting portion 3B is connected to the end surface of the circuit board 2 (the left end surface in FIG. 1). It is connected. Further, the wide connecting portion 4A of the connecting piece 4 is connected to the end surface (the lower end surface in FIG. 1) of the circuit board 2, and the narrow connecting portion 4 is formed.
B is connected to the end face of the circuit board 1 (lower end face in FIG. 1). Further, the wide connecting portion 5A of the connecting piece 5 is connected to the end surface (lower end surface in FIG. 1) of the circuit board 1, and the narrow connecting portion 5B is connected to the end surface of the circuit board 2 (lower end surface in FIG. 1). ing.

Looking at these relationships on the side of each of the circuit boards 1 and 2, on the end face side of the circuit board 1, the wide connecting portion 3A of the connecting piece 3, the narrow connecting portion 4B of the connecting piece 4, and , Connecting piece 5
The wide connecting portions 5A are arranged in this order. On the other hand, on the end face side of the circuit board 2, the connecting portions 3A,
Corresponding to 4B and 5A, the narrow connecting portion 3B of the connecting piece 3, the wide connecting portion 4A of the connecting piece 4, and the narrow connecting portion 5B of the connecting piece 5 are arranged in this order. According to this structure, the narrow connecting portions 3B, 4B, 5B of the connecting pieces 3, 4, 5 are
Since the circuit boards 1 and 2 are alternately arranged over the end faces, the stress generated due to the bending of the circuit boards 1 and 2 when the printed wiring board P is handled is reduced by the connecting portions 3A and 3A.
B, 4A, 4B, 5A, 5B are dispersed throughout. As a result, the stress as described above is applied to each narrow connecting portion 3
Focusing only on B, 4B, and 5B is avoided, and it is not accidentally broken.

The wide connecting portion 3 of each connecting piece 3, 4, 5
Holes 6, 7, and 8 are formed in A, 4A, and 5A, respectively. The wide connecting portions 3A, 4A, 5A are easily cut through the holes 6, 7, 8 while maintaining the connection strength with the circuit boards 1, 2 at a certain level or more. I will get it.

Further, recesses 9 are formed on both sides of the wide connecting portion 3A of the connecting piece 3 so as to enter inward from the end surface of the circuit board 1.
Are formed, and on both sides of the narrow connecting portion 3B,
The recess 10 is formed so as to enter the circuit board 2 from the end surface thereof. Similarly, recesses 11 are formed on both sides of the wide connecting portion 4A of the connecting piece 4 so as to enter inward from the end surface of the circuit board 2, and on both sides of the narrow connecting portion 4B of the circuit board 1. Recess 1 so that it goes inward from the end face
2 is formed. Further, similarly, the concave portions 13 are formed on both sides of the wide connecting portion 5A of the connecting piece 5 so as to enter inward from the end surface of the circuit board 1, and the narrow connecting portion 5B is formed.
Recesses 14 are formed on both sides of the recess so as to enter inward from the end surface of the circuit board 2. Each of these recesses 9 to 1
4 removes the connecting pieces 3, 4, 5 from the printed wiring board P and obtains the two circuit boards 1, 2 by connecting the connecting portions 3A, 3B, 4A in the connecting pieces 3, 4, 5 respectively. 4B,
The cut portions between 5A and 5B and the end faces of the circuit boards 1 and 2 act so as not to project outward from the end faces of the circuit boards 1 and 2. As a result, even when burrs are generated in the cut portion, the sizes of the circuit boards 1 and 2 can be surely kept within the standard dimensions without polishing the burrs.

Next, the dimensional relationship between the connecting pieces 3, 4, 5 and their surroundings will be described with reference to FIG. The dimensional relationships among the connecting pieces 3, 4, 5 and the like have the same relationship, and therefore the dimensional relationship is shown in FIG. 2 by taking the connecting piece 3 as an example.

In FIG. 2, the width a of the cutting groove C is 3 mm.
It is set to (3 times the diameter of the die of the router), and is formed so that a tool such as a nipper can be easily inserted when cutting the connecting portions 3A and 3B, as described later. Further, the width b of the connecting piece 3 (the same applies to the width of the wide connecting portion 3A) is set to 2.5 mm, and the width c of the narrow connecting portion 3B is set to 1.5 mm. Further, the diameter of the hole 6 is 1 mm, which is the same as the diameter of the router die, the width d from the hole 6 to the outer edge of the connecting portion 3A is 0.75 mm, and the width e of the recess 9 is 1.
mm (the same as the die diameter), the width f of the recess 10 is 1 mm
(Same as the die diameter).

Then, a predetermined circuit pattern is formed on each of the circuit boards 1 and 2 in the printed wiring board P having the above-described structure by etching the copper foil adhered on both sides thereof. There is. Then, from the printed wiring board P configured as described above, the connecting pieces 3, 4,
A method for deleting the circuit board 5 and obtaining the two circuit boards 1 and 2 will be described with reference to FIGS. 3 and 4. First, after mounting various electronic components on the circuit boards 1 and 2 on which the predetermined circuit patterns are formed as described above, the cutting operation of the circuit boards 1 and 2 is performed. In such a cutting operation, first, a tool such as a nipper is inserted into the cutting groove C, and the narrow connecting portion 3B of the connecting piece 3, the wide connecting portion 4A of the connecting piece 4, and the narrow connecting portion 5B of the connecting piece 5 are inserted. Disconnect. As a result, as shown in FIG. 3, the circuit boards 1 and 2 are separated from each other. In this state, in the circuit board 1, the connecting piece 3 and the connecting piece 5 have the wide connecting portions 3A and 5A, respectively.
In the circuit board 2, the connecting piece 4 is still connected by the wide connecting portion 4A.

The cut portion cut from the narrow connecting portion 4B of the connecting piece 4 in the circuit board 1 exists at a position inside the end surface of the circuit board 1 due to the presence of the recess 12 as described above. Similarly, in the circuit board 2, the cut portion cut from the narrow connecting portion 3B of the connecting piece 3 and the cut portion cut from the narrow connecting portion 5B of the connecting piece 5 are respectively recessed portions 10, Based on the existence of 14, the circuit board 2 exists at a position inward of the end surface of the circuit board 2.

After that, the wide connecting portion 3A of the connecting piece 3 and the wide connecting portion 5A of the connecting piece 5 in the circuit board 1 are cut by a tool such as a nipper so as to pass through the holes 6 and 8, respectively. As a result, the circuit board 1 that can be used as a product
Is obtained. At this time, the cut surface of the wide connecting portion 3A of the connecting piece 3 and the cut surface of the wide connecting portion 5A of the connecting piece 5 are based on the existence of the concave portion 9 and the concave portion 13, respectively, as shown in FIG. 1 is located inside the end face of the circuit board 1. Therefore, the cutting portion cut from the narrow connecting portion 4B of the connecting piece 4 as described above may be located inside the end face of the circuit board 1. Together, the circuit board 1 can be used as a product as it is.

Next, the wide connecting portion 4A of the connecting piece 4 on the circuit board 2 is cut by a tool such as a nipper so as to pass through the hole 7. As a result, the circuit board 2 that can be used as a product is obtained. At this time, the cut surface of the wide connecting portion 4A of the connecting piece 4 is located inside the end surface of the circuit board 2 due to the presence of the recess 11, and thus the width of the connecting piece 3 is narrow as described above. The fact that the cut surface of the connecting portion 3B and the cut surface of the narrow connecting portion 5B of the connecting piece 5 are located inside the end surface of the circuit board 2 allows the circuit board 2 to be used as it is as a product. Is possible.

As described above, in the printed wiring board P according to the first embodiment, the circuit board 1 and the circuit are connected via the connecting portions 3A, 3B, 4A, 4B, 5A, 5B of the connecting pieces 3, 4, 5. The boards 2 are connected to each other, and on the end face side of the circuit board 1, the wide connecting portion 3A of the connecting piece 3 and the connecting piece 4
Narrow connecting portion 4B and wide connecting portion 5A of the connecting piece 5
Are arranged in this order, and on the end face side of the circuit board 2,
Corresponding to the respective connecting portions 3A, 4B, 5A, the narrow connecting portion 3B of the connecting piece 3, the wide connecting portion 4A of the connecting piece 4, the connecting piece 5
By arranging the narrow connecting portions 5B in this order, the narrow connecting portions 3B, 4B, 5B in each of the connecting pieces 3, 4, 5 are arranged.
However, since the circuit boards 1 and 2 are arranged so as to be alternately arranged over the end faces, the stress caused by the bending of the circuit boards 1 and 2 when the printed wiring board P is handled is reduced by the connecting portions 3A,
It can be dispersed throughout 3B, 4A, 4B, 5A, 5B. As a result, it is possible to prevent the stress as described above from concentrating only on the narrow connecting portions 3B, 4B, 5B, and reliably prevent accidental breakage.

The wide connecting portion 3 of each connecting piece 3, 4, 5
Since holes 6, 7, and 8 are formed in A, 4A, and 5A, respectively, each circuit board 1 is formed by the wide connecting portions 3A, 4A, and 5A via these holes 6, 7, and 8. It is possible to easily perform the cutting while maintaining the connection strength with 2 above a certain level.

Further, a concave portion 9 is formed on both sides of the wide connecting portion 3A of the connecting piece 3, a concave portion 10 is formed on both sides of the narrow connecting portion 3B, and a concave portion is formed on both sides of the wide connecting portion 4A of the connecting piece 4. 1
1. Since the recesses 12 are formed on both sides of the narrow connecting portion 4B, the recesses 13 are formed on both sides of the wide connecting portion 5A of the connecting piece 5, and the recesses 14 are formed on both sides of the narrow connecting portion 5B. When removing the connecting pieces 3, 4, 5 from the printed wiring board P via the respective recesses 9 to 14 to obtain the two circuit boards 1 and 2, the connecting connections of the connecting connections 3, 4 and 5 are obtained. Part 3A,
The cut portion between 3B, 4A, 4B, 5A, 5B and the end surface of each circuit board 1, 2 can be located at a position more inward than the end surface of each circuit board 1, 2. As a result, even if burrs are generated at the cut portion, the sizes of the circuit boards 1 and 2 can be surely kept within the standard dimensions without polishing the burrs.

Next, the second embodiment of the present invention will be described with reference to FIG.
It will be described with reference to FIG. Here, FIG. 5 is a plan view showing a connection state between two circuit boards in a printed wiring board, FIG. 6 is an explanatory view showing a dimensional relationship between a connecting piece and its surroundings, and FIG. 7 is another connecting piece and its surroundings. It is explanatory drawing which shows a dimensional relationship.

In FIG. 5, the printed wiring board Q is made of a copper clad heat-resistant glass epoxy board (board thickness 1.6 mm) as in the case of the first embodiment, and basically comprises two circuit boards 21 and 22. Connecting pieces 23 (three shown in FIG. 1),
It has the structure connected mutually via 24 and 25. An L-shaped cutting groove D is provided between the circuit boards 21 and 22 by the connecting pieces 23, 24 and 25.

The cutting groove D is formed by cutting the printed wiring board P by using a router having a die with a diameter of 1 mm attached to the NC cutter, as in the first embodiment. Such a cutting groove D
Simultaneously with the formation of the circuit board, the circuit boards 21, 22, the connecting pieces 23, 2,
4 and 25 have a predetermined shape (see FIG. 1) on the printed wiring board Q.
(See) is created.

Each connecting piece 23, 2 formed as described above
The connecting portions 2 and 4 have the same width at both ends (set to a width slightly larger than the width of the connecting pieces 3, 4, and 5 in the first embodiment, as will be described later).
3A, 24A, 25A are provided, and the respective connecting portions 23A, 24 in the respective connecting pieces 23, 24, 25 are provided.
The circuit boards 21 and 22 are connected to each other via A and 25A. In addition, each connecting piece 23, 24,
Elliptical holes 26, 27, 28 are formed in each of the connecting portions 23A, 24A, 25A of 25.

Based on this structure, the stress caused by the bending of the circuit boards 21 and 22 when handling the printed wiring board Q is dispersed over the entire connecting portions 23A, 24A and 25A. The stress as described above is prevented from being concentrated on each of the connecting portions 23A, 24A, 25A, and is not inadvertently broken at each of the connecting portions 23A, 24A, 25A. In addition, each connecting portion 23A, 24A,
25A has elliptical holes 26, 27, 28, respectively.
Since these holes are formed, these holes 26, 2
7, 28A through each of the connecting portions 23A, 24A, 25A
Can be easily cut while maintaining the connection strength with each of the circuit boards 21 and 22 above a certain level.

Next, based on FIG. 6, each connecting piece 23, 24,
25 and the dimensional relationship of the circumference | surroundings are demonstrated. The dimensional relationships of the connecting pieces 23, 24, 25, etc. have the same relationship. Therefore, in FIG.
As an example, the dimensional relationship is shown.

In FIG. 6, the width g of the cutting groove D is 3 mm.
It is set to (3 times the diameter of the die of the router), and is formed so that a tool such as a nipper can easily enter when cutting each connecting portion 23A. The width h of the connecting piece 23 is 3.5 m.
It is set to m. Further, the holes 26 having an elliptical shape
Has a length i in the major axis direction of 1.5 mm and a length j in the minor axis direction
Is set to 1 mm, which is the same as the diameter of the router die, and the distance k between the holes 26 is 1 mm.
In addition, from the long-axis direction edge of each hole 26 to the connecting piece 23
The distance l to the edge is set to 1 mm.

Then, a predetermined circuit pattern is formed on each of the circuit boards 21 and 22 in the printed wiring board Q having the above-described structure by etching the copper foil adhered to both surfaces thereof. There is. Since the work of separating the circuit boards 21 and 22 from the printed wiring board Q is the same as that in the first embodiment,
The description is omitted here.

As described above, in the printed wiring board Q according to the second embodiment, the circuit board 21 and the circuit board 22 are connected via the relatively wide connecting portions 23A, 24A, 25A of the connecting pieces 23, 24, 25. And the connecting portions 23A, 24 of the connecting pieces 23, 24, 25.
A and 25A have elliptical holes 26, 27, and
Since 28 is formed, stress generated by bending of the circuit boards 21 and 22 when the printed wiring board Q is handled is reduced by each connecting portion 2.
It is possible to reliably prevent the connecting portions 23A, 24A, 25A from being dispersed over the entire 3A, 24A, 25A and being inadvertently broken, and to prevent the holes 26, 2 from being broken.
It is possible to easily disconnect the circuit boards 21 and 22 through the wires 7 and 28 while maintaining the connection strength with the circuit boards 21 and 22 at a certain level or more.

Incidentally, each connecting piece 2 in the second embodiment.
Regarding the shapes and dimensional relationships of 3, 24 and 25, the same effects as described above can be obtained even if the shapes and dimensional relationships shown in FIG. 7 are used. Here, the connecting pieces 23, 24, 25 have the same configuration as each other, and the connecting piece 23 is shown as an example in FIG. 7. Further, hereinafter, only points different from the dimensions shown in FIG. 6 will be described.

In FIG. 7, the connecting piece 23 has holes 26.
4 arc-shaped portions 29 are formed facing each other, and the radius m of each of the arc-shaped portions 29 is set to 0.5 mm (half the router die diameter). Also, each hole 2
The distance n from the edge in the long axis direction of 6 to the edge of the connecting piece 23 is set to 0.5 mm. The other dimensions are set to the same dimensions as those shown in FIG.

As described in detail above, in the printed wiring boards P and Q according to the first and second embodiments, the connecting pieces 3, 4, 5 and the circuit boards 1, 2 and the connecting pieces 23 are provided. Two
4 and 25 and the circuit boards 21 and 22 are improved in connection strength so that the connection pieces 3, 4, 5, 2 can be handled when the printed wiring boards P and Q are handled.
3, 24, 25 can be easily handled without being broken carelessly and the occurrence of defective products can be reduced, and the connecting portion of each connecting piece 3, 4, 5, 23, 24, 25 can be cut. Can be performed very easily.

[0039]

As described above, according to the present invention, the connection strength between each connecting piece and each circuit board is improved to facilitate the handling of the printed wiring board without accidentally breaking the connecting piece. The number of defective products can be reduced and
It has been possible to provide a printed wiring board in which the connecting portion of each connecting piece can be cut very easily, and the industrial effect thereof is great.

[Brief description of drawings]

FIG. 1 is a plan view showing a connection state of two circuit boards in a printed wiring board according to a first embodiment.

FIG. 2 is an explanatory diagram showing a dimensional relationship between a connecting piece and its periphery.

FIG. 3 is a plan view of each circuit board showing a state where the two circuit boards are disconnected from each other.

FIG. 4 is a plan view of a circuit board showing a state in which a connecting piece is removed from one circuit board whose connection has been released.

FIG. 5 is a plan view showing a state where two circuit boards are connected to each other in the printed wiring board according to the second embodiment.

FIG. 6 is an explanatory view showing a dimensional relationship between a connecting piece and its periphery.

FIG. 7 is an explanatory diagram showing a dimensional relationship of another connecting piece and its periphery according to the second embodiment.

[Explanation of symbols]

1, 2 ... Circuit board, 3, 4, 5 ... Connecting piece, 3
A, 4A, 5A ... Wide connecting part, 3B, 4B, 5B
..Narrow connection parts, 6, 7, 8 ... Holes, 21, 22 ...
..Circuit boards, 23, 24, 25 ... Connecting pieces, 23
A, 24A, 25A ... connecting portion, 26, 27, 28 ...
..Vacancy, C, D ... Cutting groove, P, Q ... Printed wiring board

Claims (3)

[Claims] 1. A plurality of connecting pieces are formed between end surfaces of at least two first and second circuit boards facing each other,
In a printed wiring board in which each circuit board can be obtained by connecting the circuit boards to each other through the connecting pieces and removing the connecting pieces, a first wiring board having a predetermined width is formed at one end of each of the connecting pieces. 1
A connecting part and a second connecting part formed at the other end of each of the connecting pieces and having a width narrower than that of the first connecting part; and the first and second circuit boards include first and second connecting pieces. A printed wiring board, wherein the first and second connecting portions are connected to each other through two connecting portions, and the first and second connecting portions are alternately arranged on the end faces of the first and second circuit boards. 2. The printed wiring board according to claim 1, wherein holes are formed in the first connecting portion. 3. A plurality of connecting pieces are formed between end surfaces of at least two circuit boards facing each other, and the circuit boards are connected to each other through the connecting pieces and the connecting pieces are removed. In a printed wiring board capable of obtaining each circuit board, it is provided with a connecting portion formed at both ends of each connecting piece and having the same width, and a hole formed in each connecting portion. Printed wiring board.