JPH09232708A - Connection structure of printed circuit board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable connection of a multilayered rigid printed circuit board to a flexible printed circuit board with many signal lines in narrow connection spaces. SOLUTION: Connecting flexible printed circuit boards 5, 6 are used to electrically connect a multilayer rigid printed circuit board 1 having at least two connectors 3, 4 disposed in parallel at one side to a flexible printed circuit board 2. The boards 5, 6 are connected to the board 1 through connectors and connected to the board 2 by compression bonding of multi-point connection terminals 12 with conductor patterns on compression bonding connections 10, 11. The board 2 has the same number of compression bonding connections 10, 11 as the number of the connecting boards 5, 6. Each of the flexible boards 2, 5, 6 is a both side printed circuit board.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various electronic equipments and devices including precision machines such as cameras,
The present invention relates to a printed circuit board connection structure for electrically connecting a multilayer rigid printed circuit board and a flexible printed circuit board.

[0002]

2. Description of the Related Art A multilayer rigid printed circuit board (hereinafter referred to as
A flexible printed circuit board (hereinafter referred to as FPC) is used as a method for electrically connecting the
In addition, it is generally performed for each circuit board via a connector connecting portion. The PCB is a board made of a hard material and has no problems such as solder float or mounting failure when mounting a connector for connection on the board surface, and is therefore effective as a connecting means. Also, PC
In the case of electrically connecting B and FPC, a connector, a solder bridge,
It is general practice to use crimping or the like and use solder bridge, pressure welding or the like on the FPC side.

Here, as described above, the number of connections, mounting space, workability, reliability, etc. are taken into consideration when selecting the general connecting means when connecting the PCB or between the PCB and the FPC. To be selected. For example, when the number of connections is small, workability at the time of connection and reliability of connection are taken into consideration, and if there is no mounting space, solder bridges or crimp-solder bridges are used for connection. If the mounting space is large, the connector is connected via the solder bridge, and if the number of connections is large, the connector is connected via the pressure contact. The above-mentioned pressure contact connecting portion mainly has a flat pressure contact connecting end and a round pressure contact connecting end. Generally, the flat pressure contact connecting end is effective for connection at the end face of the FPC, and the pressure contact connecting end other than the end face of the FPC. A round pressure connection end is used for the connection.

[0004]

However, the conventional connection method as described above has the following problems. That is, in various devices and apparatuses that incorporate a printed circuit board, the mounting space has become narrower as the size and performance have advanced in recent years, and components must be mounted on the circuit board with high density in a limited space. I won't. Then, as a substrate that can be mounted with high density as described above, a multilayer P
CB is adopted, and since the number of signal lines connecting between the multilayer PCB and the FPC has increased, a connector is used as a connecting means with the PCB in the connecting FPC for connecting between them. There is no choice but to use it.

Therefore, it is difficult to secure a mounting space corresponding to the number of signal lines connected by a solder bridge which is generally used in the past as a means for connecting to the FPC in the above-mentioned connection FPC. In order to perform the connection by the solder bridge, there is a problem that the shape of the FPC for connection becomes complicated, and the workability at the time of connection and the reliability of the connection part are lacking. Therefore, when connecting the PCB and the FPC as described above, it is possible to cope with higher packaging density, cope with an increase in the number of connections, and easily connect the multilayer PCB and the FPC. It is hoped that measures will be taken.

The present invention has been made in view of the above circumstances, and when electrically connecting a PCB and an FPC, connection of a large number of signal lines is required due to high packaging density. The purpose of the present invention is to obtain a printed circuit board connection structure that can be easily performed with a small connection space.

[0007]

In order to meet such a demand, a printed circuit board connection structure according to the present invention is a rigid printed circuit board (P) having at least two connectors.
CB) and the flexible printed circuit board (FPC) are electrically connected by using a plurality of connecting flexible printed circuit boards (connecting FPC), and connecting these connecting flexible printed circuit boards to the rigid printed circuit board by connector connection. In addition, the connection with the flexible printed circuit board is performed by pressure contact of the multi-point connection terminal portion by the conductive pattern provided in the pressure contact connection portion.

Here, in the printed circuit board connection structure according to the present invention, the connectors of the rigid printed circuit board are arranged in parallel near one side of the board and the flexible printed circuit board has the same number as the number of the connecting flexible printed circuit boards. Is provided, the rigid printed circuit board is composed of a multilayer rigid printed circuit board having at least four layers, and the flexible printed circuit board and the connecting flexible printed circuit board are composed of double-sided boards.

Also, in the printed circuit board connection structure according to the present invention, two connectors are provided in parallel on one side of the board on the multilayer rigid printed circuit board, and the contact portions of these two connectors are constituted by different contact groups. With
The flexible printed circuit board electrically connected to the multilayer rigid printed circuit board is connected by two flexible printed circuit boards for connection,
In addition, two press-connecting connection parts for connecting to these connecting flexible printed circuit boards are provided, the connecting flexible printed circuit boards are arranged in parallel, and press-contacting by a conductive pattern that constitutes the press-connecting connecting part on one of the respective board surfaces. A multi-point connection terminal portion for connection and a signal pattern portion are formed, and a dummy pattern (power supply system pattern or ground system pattern) is formed on the other board surface. The flexible printed boards are sandwiched between two pressure-contacting connection portions in a stacked state to perform pressure-contacting connection.

According to the present invention, a plurality of FPCs for connection provided between the PCB and the FPC as connection means are used, and the PCB side is for connector connection by a connector and the FPC side is for pressure contact connection by a conductive pattern. By connecting by pressure contact connection using the multi-point connection terminal portion, it becomes possible to efficiently connect a large number of signal lines between these PCBs and FPCs with a small connection space.

In addition, the two connectors of the PCB are
Are arranged in parallel to one side, and two connection FPCs that connect to the contact portions of different contact groups of these connectors are arranged in parallel, and further, the respective connection portions and signal patterns of these connection FPCs are the same. By forming a dummy pattern (power system pattern or ground pattern) on the other board surface on the other board surface, a large number of signal lines between the PCB and the FPC can be efficiently connected with a small connection space. In addition to being able to, the noise from the FPC for connection and other FPCs at the connection part on the FPC side
The noise from can also be prevented.

The rigid printed circuit board is a multilayer printed circuit board (PCB), for example, four layers, and the flexible printed circuit board (FPC) and the connecting flexible printed circuit board (connecting FPC) are double-sided boards. Not necessarily. The connector of the PCB is configured to be inserted and connected with a connection end of a connection terminal group of a large number of signal lines provided at one end of the connection FPC. The other end of the connection FPC is provided with a pressure contact connection portion having a multi-point connection terminal portion for pressure contact connection by a conductive pattern as a connection terminal group of a large number of signal lines, and these pressure contact connection portions are pressure contact terminals provided on the FPC. It is connected by pressure contact with the connection part.

[0013]

1 and 2 show an embodiment of a printed circuit board connection structure according to the present invention. In these drawings, reference numeral 1 denotes an appropriate circuit component mounted. PCBs 2 and 2 which are multilayer rigid printed boards forming a circuit are FPCs which are flexible printed boards for connecting to the PCB 1.

As shown in FIG. 1, the PCB 1 is provided with at least two at one side of the substrate surface 1a.
In this embodiment, the two connectors 3 and 4 are provided side by side. It should be noted that as such connectors 3 and 4, it is preferable to use a connector having a widely known structure. The FPC 2 is composed of a double-sided flexible printed circuit board, and a large number of signal lines are provided on both sides. Note that circuit components may be mounted as needed.

Reference numerals 5 and 6 are connecting FPCs which are a plurality of (two in this embodiment) connecting flexible printed boards provided as means for connecting between the above-mentioned PCB1 and FPC2. Connection terminals 7 and 8 are provided in parallel with connecting terminal groups of a large number of signal lines connected to the connectors 3 and 4 by insertion. Such connecting ends 7 and 8 are connected to corresponding connectors 3 and 4.
When connected to, the connection terminals of each line are connected.

As shown in FIGS. 2 (a) and 2 (b), the connection FPCs 5 and 6 are formed with connection terminal groups at the connection ends 7 and 8 on one substrate surface. A large number of signal lines 9 are formed by a conductor pattern connected to these terminals, and are led to the pressure-contact connecting portions 10 and 11 at the other ends. The pressure contact connecting portions 10 and 11 of the connecting FPCs 5 and 6 are provided with pressure contact connecting multi-point connection terminal portions 12 connected to the signal lines 9.

As shown in FIG. 2A, for example, the multi-point connection terminal portion 12 for pressure contact connection is formed by dividing an annular conductive pattern as a round pressure contact connection portion into a plurality of slits extending in the radial direction. It constitutes a point connection terminal. With this configuration, a large number of signal lines can be efficiently connected with a small connection space. Further, as shown in FIG. 2B, a dummy pattern (power source pattern or ground pattern) 13 made of a conductive layer such as copper foil is formed on the other substrate surface which is the back surface of the connection FPCs 5, 6. Is forming.

On the other hand, at the end of the FPC 2 which is the connected side connected by these connecting FPCs 5 and 6, a pressure contact connecting portion for connecting with the pressure contact connecting portions 10 and 11 by the multipoint connection terminal portion 12 is provided. 15 and 16 are formed. Although not shown in detail, these pressure contact connecting portions 15,
The multi-point connection terminal portion 12 having a shape corresponding to the multi-point connection terminal portion 12 is appropriately formed at 16 at a position facing the multi-point connection terminal portion 12. In this embodiment, the FPC 2 is folded in two and provided on opposite surfaces of both ends in order to provide the two press-contacting connection portions 15 and 16 of the FPC 2.

Then, the above-mentioned connection FPCs 5 and 6 are
The pressure contact connecting portions 10 and 11 are overlapped with each other so as to face outward, and these are connected to each other with the pressure contact connecting portions 15 and 15 of the FPC 2.
By press-contacting each other in a state of being sandwiched by 16, the signal lines can be connected in a desired state. In this embodiment, two FPCs for connection are used.
The case where the surfaces forming the conductive patterns 5 and 6 are superposed in a state of facing the same surface side, and the pressure contact connecting portions 10 and 11 are provided on the surfaces facing each other.
At this time, a dummy pattern (power supply system pattern or ground system pattern) 13 on the back surface of the connection FPCs 5, 6
Is preferably not formed in the press-connecting connection portion 10.

Using such connecting FPCs 5 and 6, P
By connecting the CB1 and the FPC2, it is possible to efficiently connect a large number of signal lines connecting between them with a small connection space. That is, the connection ends 7 and 8 of the connection FPCs 5 and 6 are respectively inserted into the connectors 3 and 4 of the PCB 1 to be connected, and the pressure contact connection portion 10 by the multipoint connection terminal portion 12 at the other end is connected.
By connecting 11 to the press-connecting connection portions 15 and 16 of the FPC 2 by press-contacting each other, a desired signal line connection state can be obtained.

FIG. 3 shows a modified example of the above-described embodiment. In this embodiment, the connection FPCs 5 and 6 are provided with dummy patterns (power supply system pattern or ground system pattern) 13 on the back side. They are superposed in a state of facing each other, and the press-connecting connection parts 15 and 16 provided outwardly at their ends are sandwiched between the press-connecting connection parts 15 and 16 of the FPC 2 for press-contact connection.

According to this structure, the FPC for connection is connected.
5 and 6, the connection ends 7, 8 and the signal line 9, on one side,
Since the press-connecting connection parts 10 and 11 are formed by the multi-point connection terminal part 12 and the dummy pattern (power supply system pattern or ground system pattern) 13 is formed on the other surface, manufacturing of these connection FPCs 5 and 6 is performed. And the noise and F of the connection FPCs 5 and 6 being installed.
It is possible to prevent the influence of noise from another FPC in the connection portion on the PC2 side. That is, such a dummy pattern 13 prevents, for example, noise (oscillation (clock) noise, a power supply line with large fluctuation, etc.) from another FPC from affecting analog lines, particularly lines with high impedance. be able to.

The present invention is not limited to the structures described in the above-mentioned embodiments, and the shapes, structures, etc. of the respective portions can be freely modified or changed. For example, in the above-described embodiment, the PCB 1 is connected by using the two connecting FPCs 5 and 6.
However, the present invention is not limited to this, and a plurality of connection FPCs may be used for connection. In this case, the pressure contact connection portions on the FPC side may be sequentially overlapped and pressure contacted so as to perform pressure contact connection with each pressure contact connection portion of the connecting FPC. Furthermore, connection FPCs 5, 6
As the multi-point connection terminal portion 12 in each of the pressure contact connecting portions 10 and 11, a round pressure contact terminal is illustrated, but it goes without saying that the invention is not limited to this.

Further, according to the present invention, although not specifically indicated as a device to which such a printed circuit board connection structure is applied, it can be applied to various electronic devices and apparatuses.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rigid printed circuit board 1 is a multilayer printed circuit board (PCB), for example, a four-layered rigid printed circuit board (FPC) 2, a flexible printed circuit board for connection (connection FPC) 5, 6 is a double-sided board. Is. Further, the connectors 3 and 4 of the PCB 2 are configured so that the connection ends 7 and 8 formed by the connection end groups of a large number of signal lines provided at one end of the connection FPC are inserted and connected. Further, a pressure contact having a multi-point connection terminal portion 12 for pressure connection formed at the other end of the connection FPC by dividing a conductive pattern such as a round pressure contact terminal as a connection end group of a large number of signal lines. Connection parts 10 and 11 are provided. Further, these press-connecting connection portions 10 and 11 are connected to the FPC2
It is connected by pressure contact with the pressure contact connection portions 15 and 16 provided on the.

[0026]

As described above, according to the printed circuit board connection structure of the present invention, a rigid printed circuit board (PCB) having at least two connectors and a flexible printed circuit board (FPC) are electrically connected. Flexible printed circuit boards for multiple connections (F for connection
PC) and connecting these flexible printed circuit boards to the rigid printed circuit board by connector connection, and the flexible printed circuit board is connected to the flexible printed circuit board by a multi-point connection terminal portion by a conductive pattern provided in the pressure contact connection portion. Since it was done by pressure welding of
Despite the simple structure, the following excellent effects are obtained.

That is, according to the present invention, the PCB and FP
A plurality of FPCs for connection are used as connection means between C and C, and furthermore, electrical connection is made by connector connection on the PCB side and pressure connection by the multi-point connection terminal portion for pressure connection by the conductive pattern on the FPC side. Since it is obtained, a large number of signal lines between these PCB and FPC can be efficiently and easily connected with a small connection space.

Further, according to the present invention, two connectors are provided on the PCB in parallel near one side of the board, the contact portions of these two connectors are constituted by different contact groups, and are electrically connected to the PCB. The connection with the FPC to be connected is configured by two connecting FPCs,
In addition, multi-points for pressure contact connection are provided by providing pressure contact connection portions for connecting to these connection FPCs at two locations, the connection FPCs are arranged in parallel, and conductive patterns forming the pressure contact connection portions on one of the respective substrate surfaces. A connection terminal portion and a signal pattern portion are formed, a dummy pattern (power supply system pattern or ground system pattern) is formed on the other substrate surface, and the FPC for connecting these two FPCs for connection is superposed. The pressure contact connection is performed by being sandwiched between the two pressure contact connection portions, and has the following advantages.

That is, it is of course possible to efficiently connect a large number of signal lines between the PCB and the FPC in a small connection space, and of course, noise of the connecting FPC in the arrangement and other parts in the connecting portion on the FPC side. It is also possible to prevent the influence of noise from the FPC.

[Brief description of drawings]

FIG. 1 is a perspective view for explaining a schematic configuration of a PCB / FPC connection structure showing an embodiment of a printed circuit board connection structure according to the present invention.

FIG. 2 shows an embodiment of a printed circuit board connection structure according to the present invention, in which the front and back conductor patterns (a) and (a) of a connection FPC including a double-sided board for connecting a PCB and an FPC are shown. It is explanatory drawing shown to b).

FIG. 3 is a perspective view showing a modified example of FIG. 1 showing another embodiment of the printed circuit board connection structure according to the present invention.

[Explanation of symbols]

1 ... Rigid printed circuit board (PCB), 2 ... Flexible printed circuit board (FPC), 3, 4 ... Connector, 5, 6
... Flexible printed circuit board for connection (FPC for connection),
7, 8 ... Connection end, 9 ... Signal line by conductor pattern,
10, 11 ... Pressure contact connection part, 12 ... Multi-point connection terminal part for pressure contact connection, 13 ... Dummy pattern (power system pattern or ground system pattern), 15, 16 ... Pressure contact connection part.

Claims (5)

[Claims] 1. A connection structure for electrically connecting a rigid printed circuit board having at least two connectors to a flexible printed circuit board, wherein the rigid printed circuit board and the flexible printed circuit board are connected by a plurality of connecting flexible printed circuit boards. And the connection of these flexible printed boards to the rigid printed board is performed by connector connection, and the flexible printed board is connected to the multipoint connection terminal portion for pressure contact connection by the conductive pattern provided in the pressure contact connection portion. A printed circuit board connection structure, characterized in that the connection is performed by pressure welding. 2. The printed circuit board connection structure according to claim 1, wherein the connectors of the rigid printed circuit board are arranged in parallel near one side of the board, and the flexible printed circuit board has the same number as the number of flexible printed circuit boards for connection. A connection structure for a printed circuit board, comprising: 3. The printed circuit board connection structure according to claim 1, wherein the rigid printed circuit board is configured by a multilayer rigid printed circuit board including at least four layers, and the flexible printed circuit board and the connecting flexible printed circuit board are provided. A printed circuit board connection structure comprising a double-sided flexible printed circuit board. 4. The printed circuit board connection structure according to claim 1, wherein two connectors are provided in parallel on one side of the board on the multilayer rigid printed circuit board, and contact points of these two connectors are formed by different contact groups. In addition, the connection with the flexible printed circuit board electrically connected to the multilayer rigid printed circuit board is configured by two flexible printed circuit boards for connection,
And the pressure contact connecting portion for connecting with these connecting flexible printed boards is provided at two places, and the connecting flexible printed boards are arranged in parallel,
A multi-point connection terminal portion for pressure contact connection and a signal pattern portion by a conductive pattern forming the pressure contact connection portion are formed on one of the respective substrate surfaces, and a dummy pattern is formed on the other substrate surface. A flexible printed circuit board connection structure, wherein the flexible printed circuit boards are sandwiched between two flexible printed circuit boards in a state in which they are overlapped with each other to perform pressure contact connection. 5. The printed circuit board connection structure according to claim 4, wherein the dummy pattern is a power system pattern or a ground system pattern.