JPH07162122A - Wiring construction for printed circuit board - Google Patents

Abstract

PURPOSE:To connect major part of a printed circuit board with the conductive pattern of a flexible circuit board so as to simplify the pattern arrangement and increase the degree of freedom for part arrangement. CONSTITUTION:The title construction is used to connect a conductive pattern 3 of a printed circuit board 1 with that of a flexible circuit board 9. It has an appoximate U-shaped part 5a and a plurality of lead terminals 5 which are connected electrically and mechanically with the pattern 3 of the printed circuit board so that the U-shaped parts may be lined up mutually. Further the board 9 is bent and inserted into the lined-up U-shaped parts of multiple lead terminals in a manner that the conductive pattern side will be brought into contact with a lead terminal. The part 5a of the terminal 5 corresponding to the pattern 13 of the board 9 is, for example, bonded by soldering.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board wiring structure, and more particularly, to a printed circuit board (PCB) and a flexible printed circuit board (FPC) which can be easily and arbitrarily connected to each other. To simplify the pattern routing and increase the degree of freedom in component placement.

[0002]

2. Description of the Related Art Conventionally, a printed circuit board (PCB) and a flexible printed circuit board (FPC) are connected to each other by using a connector or by thermocompression bonding, thereby facilitating the pattern routing of the printed circuit board, and The printed circuit board can be easily connected to an external circuit without using a lead wire or the like. That is, by using the printed circuit board and the flexible circuit board together, without using lead wires,
Wiring of the part where pattern routing is difficult is also possible, and the degree of freedom in component placement is increased.

[0003]

However, in such a conventional wiring structure, a connector is used to connect the conductive pattern of the printed circuit board and the conductive pattern of the flexible circuit board, or both of them are used. The conductive patterns on the circuit board were connected by thermocompression bonding or the like.
Therefore, a considerable space on the printed circuit board is required for connecting the conductive patterns of both, and the area that can be used for pattern routing of both circuit boards is reduced, which makes it difficult to route the patterns. there were. Therefore, there is a problem that both the printed circuit board and the flexible circuit board are increased in size, and it is necessary to make these circuit boards multi-layered.

In view of the problems in the structure of the conventional example, an object of the present invention is to provide a wiring structure of a printed circuit board with a simple structure and easily connectable to a flexible printed circuit board in many parts of the printed circuit board. It is to simplify the layout of patterns on a circuit board and increase the degree of freedom in component placement.

[0005]

To achieve the above object, the present invention provides a wiring structure for connecting a conductive pattern of a printed circuit board and a conductive pattern of a flexible circuit board. The wiring structure includes a plurality of lead terminals each having a substantially U-shaped portion and electrically and mechanically coupled to a conductive pattern of a printed circuit board so that the U-shaped portions are aligned with each other. A flexible printed circuit board is inserted into the aligned U-shaped portions of the plurality of lead terminals, the conductive pattern side being bent and inserted so as to contact the lead terminals.

Further, it is convenient to solder the conductive pattern of the flexible printed circuit board to the U-shaped portion of the corresponding lead terminal.

[0007]

In the above structure, a plurality of lead terminals having U-shaped portions are aligned and electrically and mechanically coupled to the conductive pattern of the printed circuit board by, for example, soldering. The U of the aligned lead terminals
The flexible printed circuit board is bent and inserted into the character portion so that the conductive pattern side is on the outside. In this case, the conductive pattern of the flexible printed circuit board and the corresponding lead terminals are positioned so as to be in contact with each other.
The U-shaped portion of the lead terminal is pressed, for example, from both sides to firmly fix the flexible printed circuit board, or the U-shaped portion of the lead terminal to which the conductive pattern of the flexible printed circuit board corresponds. Soldered. This electrically connects the conductive pattern of the printed circuit board and the conductive pattern of the flexible circuit board.

With such a structure, it is possible to accurately connect the middle part of the conductive pattern of the flexible printed circuit board to the corresponding conductive pattern of the printed circuit board.
In addition, by arranging the lead terminals in alignment on the printed circuit board, it is possible to connect conductive patterns of a plurality of lines at the same time, and further, groups of such aligned lead terminals can be arranged at multiple locations on the printed circuit board. By providing it, it becomes possible to connect in many parts of the printed circuit board.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a side view of a wiring structure of a printed circuit board according to an embodiment of the present invention. In the figure, a single or a plurality of lead terminals 5 are attached to the printed circuit board 1 at a plurality of locations. Each lead terminal 5 has a U-shaped portion 5a and a lead portion 5b connected to this U-shaped portion 5a, as will be described later in detail. Each lead portion 5b is printed circuit board 1
It is soldered with the conductive pattern 3 and the solder 7 on the back surface or the front surface through the through hole provided in the.

A flexible circuit board 9 is bent and inserted into the U-shaped portion 5a of the lead terminal 5. In this case, the conductive pattern (not shown) of the flexible circuit board is in contact with the U-shaped portion 5a of the lead terminal 5.

Conductive pattern 1 of flexible circuit board 9
3 and the U-shaped portion 5a of the lead terminal 5 are soldered with the solder 11. The contact between the conductive pattern 13 and the U-shaped portion 5a of the lead terminal 5 can be made by pressing the flexible circuit board 9 from above the conductive patterns 13 on both sides by the U-shaped portion 5a, for example.

With the above structure, the conductive pattern 3 of the printed circuit board 1 and the conductive pattern 13 of the flexible circuit board 9 can be accurately connected with a simple structure. Therefore, a plurality of conductive patterns 13 are provided on the flexible circuit board 9 at a predetermined pitch, and the lead terminals 5 are aligned on the printed circuit board 1 in accordance with the pitch, so that the plurality of conductive patterns 3 are formed. , 13 can be simultaneously connected by a simple operation. Further, by providing such groups of aligned lead terminals 5 at a plurality of locations on the printed circuit board 1 as shown in FIG. 1 and connecting the lead terminal groups by a flexible circuit board, it is possible to print. It becomes possible to connect to the flexible circuit board 9 in many parts of the circuit board 1.

As a result, the connection between the various conductive patterns on the printed circuit board 1 and the printed circuit board 1
Connection between the upper conductive pattern and an external circuit can be performed very easily. Therefore, it is possible to simplify the routing of the conductive pattern on the printed circuit board 1 and increase the degree of freedom in the arrangement of parts, and as a result, it is possible to reduce the cost of parts including the circuit board.

FIG. 3 shows an example of a lead terminal for performing the above wiring structure. The lead terminals of FIG. 3 show the case of using a lead frame which has been conventionally used in a hybrid IC, for example. That is,
The lead frame of FIG. 3 is configured by connecting a plurality of lead terminals to the frame base portion 15 at predetermined intervals.
Each lead terminal includes a lead portion 17 connected to the frame base 15 and opposed terminal portions 19 and 21 connected to the lead portion 17 and facing each other with a predetermined space. When this lead frame is used for the hybrid IC, the opposing terminal portion 1 is provided on the circuit board of the hybrid IC.
After sandwiching the U-shaped portion formed by 9, 21 and fixing it to the corresponding conductive pattern of the circuit board by soldering, it is cut along the line AA.

When such a lead frame is used in the structure shown in FIGS. 1 and 2, the lead terminals are separated from the frame base 15 along the line AA in advance, and the desired portion of the printed circuit board 1 is cut. Is inserted into the through hole and soldered to the conductive pattern 3 formed around the through hole. Thereafter, as described above, the flexible circuit board 9 is inserted into the U-shaped portion of each lead terminal and soldered.

FIG. 4 shows another example of a lead frame that can be used in the wiring structure shown in FIGS. In the lead frame of FIG. 4, a plurality of lead terminals are connected to the frame base 23 at predetermined intervals, but unlike the case of FIG. 3, the frame base 23 is one terminal for forming the U-shaped portion of the lead terminal. It is connected to the part 27. Therefore, the tip of the lead portion 25 of each lead terminal is separated for each lead terminal. Therefore, such a lead frame can be simultaneously inserted into a desired plurality of through holes for connection of the printed circuit board 1 shown in FIGS. 1 and 2 with a plurality of lead terminals connected to the frame base 23. . After inserting the plurality of lead terminal portions into the predetermined through holes of the printed circuit board 1 and soldering to the corresponding conductive patterns, the frame base 23 is cut along the line BB to remove it. As a result, a plurality of lead terminals can be simultaneously and efficiently attached to the printed circuit board 1.

[0017]

As described above, according to the present invention, the parts of the printed circuit board and the printed circuit board can be printed with a very simple structure and process and without requiring a large space on the printed circuit board for connection. The flexible printed circuit board can be used to accurately connect between the circuit board and the external circuit. Further, since the connection can be made in many parts on the printed circuit board, it is possible to extremely simplify the pattern routing of the printed circuit board, and it is possible to increase the degree of freedom in arranging components, and as a result, the circuit board It is possible to reduce the cost of the included parts.

[Brief description of drawings]

FIG. 1 is a side view showing a wiring structure of a printed circuit board according to an embodiment of the present invention.

FIG. 2 is a partially enlarged perspective view showing details of a part of the wiring structure of FIG.

FIG. 3 is a front view (a) and a side view (b) of a lead frame provided with lead terminals that can be used in a wiring structure of a printed circuit board according to the present invention.

FIG. 4 is a front view (a) and a side view (b) showing another example of a lead frame provided with lead terminals that can be used in the wiring structure of the printed circuit board according to the present invention.

[Explanation of symbols]

1 Printed Circuit Board 3 Conductive Pattern on Printed Circuit Board 1 5 Lead Terminal 5a U-Shaped Part 5b Lead Part 7,11 Solder 9 Flexible Circuit Board 13 Conductive Pattern of Flexible Circuit Board 9 15,23 Frame Base 17,25 Lead Part 19, 21, 27, 29 Lead electrode portion for forming U-shaped portion

Claims (2)

[Claims] 1. A wiring structure of a printed circuit board for connecting a conductive pattern of a flexible printed circuit board to a conductive pattern of the printed circuit board, each having a substantially U-shaped portion, and the U-shaped portion. A plurality of lead terminals electrically and mechanically coupled to the conductive pattern of the printed circuit board so that the conductive patterns are aligned with each other, and the conductive pattern side of the U-shaped portions of the plurality of lead terminals is the lead terminal. A printed circuit board wiring structure, comprising: a flexible printed circuit board that is bent and inserted so as to come into contact with the flexible printed circuit board. 2. The wiring structure of the printed circuit board according to claim 1, wherein the conductive pattern of the flexible printed circuit board is soldered to the corresponding U-shaped portion of the lead terminal.