JP2007335434A - Flexible wiring board, method for repairing disconnection thereof and circuit board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To recover the FPC function without replacing or repairing the FPC itself upon occurrence of disconnection of wiring on the FPC. <P>SOLUTION: At least one wiring 2 is provided on an FPC 1 connecting between circuit boards 21 and 22, and at least one redundant wiring 3 is provided on the outside of the wiring 2. When any one of the wiring 2 is disconnected, it is replaced by the redundant wiring 3. Out of terminals 23 for connecting the wiring 2 with the circuit boards 21, 22, connection is switched by jumper connection between the connection terminal of disconnected wiring and the selected redundant connection terminal 24 of the redundant wiring portion 3. Alternatively, an I/O port is employed capable of altering assignment of the connection terminal 23 and the redundant connection terminal 24, and connection is switched by an LSI performing assignment alteration control of the I/O port such that the I/O port corresponding to the connection terminal of disconnected wiring at the wiring 2 of the FPC 1 is reassigned to the I/O port corresponding to the redundant connection terminal 24. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a flexible wiring board (FPC: Flexible).
Printed Circuit), a circuit board, and a repair method when a flexible wiring is disconnected.

As described in Japanese Patent Application Laid-Open No. 2001-332820 “Flexible Wiring Board” of Patent Document 1, a liquid crystal display panel used for a portable terminal or the like and a circuit board that supplies a signal to the liquid crystal display panel A flexible wiring board (FPC) is often used for a movable part in a mobile terminal, and external stress is applied to the FPC as the casing moves, and the wiring layer on the FPC is disconnected. In order to prevent the occurrence of a failure, a technique for ensuring its reliability has been developed. In recent years, portable terminals that have been miniaturized have not been connected to FPCs using conventional connectors, and the FPC and circuit board can be connected to each other using thermocompression bonding using an ACF (Anisotropic Conductive Film). Are starting to make connections.
JP 2001-332820 A (page 3)

  When using thermocompression bonding technology like this, special equipment is required for removing and re-compressing the ACF part, so when repair work occurs, it is necessary to respond at the repair site where the special equipment is located. , Nationwide development is not possible, and it takes a long time to complete repairs. Further, in pursuit of quick repair, there is an increasing number of cases where repair is performed by replacing the entire FPC or circuit board without removing the ACF portion and performing re-compression. In such a case, many parts are discarded, and cost is inevitable.

  Accordingly, an object of the present invention is to provide flexible wiring that can restore the function of the FPC using simple means without replacing or repairing the FPC itself even when the wiring layer of the FPC is disconnected due to external stress or the like. An object of the present invention is to provide a substrate, a circuit board, and a repair method when a flexible wiring is disconnected.

  In order to solve the above-described problems, the flexible wiring board, the circuit board, and the repair method at the time of disconnection of the flexible wiring according to the present invention employ the following characteristic configuration.

(1) A flexible wiring board having one or more wiring parts for connecting circuit boards, further having one or more redundant wiring parts, and when any of the wiring parts is broken, the broken wiring A flexible wiring board whose part is replaced by the redundant wiring part.
(2) The flexible wiring board according to (1), wherein the redundant wiring portion is disposed outside the wiring portion.
(3) A connection terminal for connecting the wiring portion to the circuit board and a redundant connection terminal for replacing the redundant wiring portion with the wiring portion, and any of the wiring portions is disconnected. In this case, the connection terminal of the disconnected wiring portion or the wiring on the circuit board connected to the connection terminal and the redundant connection terminal selected from the redundant connection terminals The flexible wiring board according to the above (1) or (2), which can be connected by jumper wiring.
(4) In a circuit board connected to each other via the wiring of the flexible wiring board, a connection terminal for connecting to one or more wiring portions of the flexible wiring board, and one or more redundancy of the flexible wiring board A circuit board having a redundant connection terminal for connecting to a wiring portion.
(5) When one of the wiring portions of the flexible wiring board is disconnected, between the connection terminal connected to the wiring portion and the redundant connection terminal selected from the redundant connection terminals. The circuit board according to (4) above, which can be connected by jumper wiring.
(6) An LSI having the connection terminal and the redundant connection terminal as an I / O port capable of changing and assigning an input / output position of a signal, and including an LSI for performing change assignment control of the I / O port, When any one of the wiring portions of the flexible wiring board is disconnected, an I / O port corresponding to a connection terminal connected to the wiring portion corresponds to the redundant connection terminal under the control of the LSI. The circuit board according to (4), wherein the connection terminal and the redundant connection terminal are switched by reassigning the I / O port.
(7) A repair method at the time of a flexible wiring disconnection that repairs a disconnection that occurs in one or a plurality of wiring portions of a flexible wiring substrate that connects circuit boards,
The flexible wiring board further includes one or a plurality of redundant wiring portions, and when any of the wiring portions is disconnected, the repair method at the time of disconnecting the flexible wiring is replaced with the redundant wiring portion. .
(8) The repair method when the flexible wiring is disconnected according to (7), in which the redundant wiring portion is arranged outside the wiring portion.
(9) A connection terminal for connecting the wiring portion to the circuit board and a redundant connection terminal for replacing the redundant wiring portion with the wiring portion, and any one of the wiring portions is disconnected. In this case, the connection terminal of the disconnected wiring portion or the wiring on the circuit board connected to the connection terminal and the redundant connection terminal selected from the redundant connection terminals (7) or (8) is a method for repairing when the flexible wiring is disconnected, wherein the gaps can be connected by jumper wiring.
(10) An assignment control step of having the connection terminal and the redundant connection terminal as I / O ports capable of changing and assigning signal input / output positions, and performing change assignment control of the I / O ports. When one of the wiring portions of the flexible wiring board is disconnected by the control, the I / O port corresponding to the connection terminal connected to the wiring portion is changed to the I / O corresponding to the redundant connection terminal. (7) or (8) is a method for repairing when the flexible wiring is disconnected, by switching between the connection terminal and the redundant connection terminal by reassigning the port.

  According to the flexible wiring board (FPC), the circuit board, and the repair method at the time of disconnection of the flexible wiring of the present invention, the following effects can be obtained.

  The first effect is that the function of the FPC can be recovered without replacing the FPC itself, so that the FPC cost associated with repair and the human cost of repair work can be greatly reduced.

  The second effect is that it is not necessary to prepare special equipment for the FPC repair, so that the cost required for the equipment can be reduced and the time required for the repair can be shortened.

  The third effect is that the disconnected wiring part on the FPC can be switched to the redundant wiring part only by changing the I / O assignment in the LSI without adding hardware-related repair / correction. It is possible to shorten the time.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a flexible wiring board, a circuit board, and a flexible wiring repair method according to the present invention are described below with reference to the accompanying drawings.

  FIG. 1 is a schematic view showing an example of a flexible printed circuit (FPC) according to the present invention. In FIG. 1, reference numeral 1 denotes an FPC, reference numeral 2 denotes one or more wiring parts arranged on the FPC 1, and reference numeral 3 denotes one or more redundant wiring parts arranged on the FPC 1 as a spare. As shown in FIG. 1, a flexible wiring board (FPC) according to the present invention has a redundant wiring portion 3 having a redundant configuration in addition to a normal wiring portion 2. When disconnection due to external stress or the like occurs in the wiring part 2 configured on the FPC 1 in FIG. 1, the redundant wiring part 3 on the FPC 1 is used as an alternative to the disconnected wiring part 2 in the repair process.

  FIG. 2 is a schematic view showing an example of a circuit board on which a flexible wiring board (FPC) according to the present invention is mounted. In FIG. 2, reference numeral 11 denotes a board-side circuit block, reference numeral 1 denotes an FPC, and reference numeral 12 denotes an FPC connection destination circuit board portion. In preparation for a case where disconnection due to external stress or the like occurs in the wiring section 2 configured on the FPC 1, the wiring of the built-in circuit on the substrate circuit block 11 and the FPC connection destination circuit board section 12 in FIG. 2 and the redundant wiring section 3 can be connected. In order to perform such a connection, a connection terminal and a redundant connection terminal are provided on the circuit board side and / or the FPC 1 side of each of the circuit board side circuit block 11 and the FPC connection destination circuit board unit 12, and the circuit board is provided. The corresponding connection terminals of the FPC 1 and the FPC 1 are connected by a conductor such as Cu, and the connection terminals on the circuit board or the FPC 1 and the redundant connection terminals are connected using a conductor wiring (jumper wiring). To do.

  Thereby, the repair of the disconnected FPC1 part can be completed without going through the process of removing FPC1 itself which increases cost, facilities, and man-hours.

  The circuit boards on both sides connected to the FPC 1 have connection terminals and redundant connection terminals as I / O ports that can change and assign signal input / output positions. As an means for realizing an allocation control method (I / O port allocation control step) for performing I / O port change allocation control for an LSI that performs control and can change the signal line allocation state in software. It is also possible to use it. In this case, by reassigning the I / O port corresponding to the wiring unit 2 found to be disconnected by failure diagnosis to the I / O port corresponding to the redundant wiring unit 3 provided on the FPC 1 under the control of the LSI, It is possible to restore the function of the FPC 1 without performing a hardware measure.

  Thus, in the present invention, the function of the FPC 1 can be easily recovered by replacing the disconnected wiring portion 2 with the redundant wiring portion 3.

(Example)
Referring to FIG. 3, an embodiment of a circuit configuration using a flexible wiring board (FPC) according to the present invention is shown. 3, reference numeral 21 denotes an FPC connection source circuit board part, reference numeral 1 denotes an FPC, reference numeral 22 denotes an FPC connection destination circuit board part, reference numeral 23 denotes a connection terminal, and reference numeral 24 denotes a redundant connection terminal. The FPC 1 is provided with one or a plurality of signal lines, and is used for signal line connection between the circuit boards of the FPC connection source circuit board part 21 and the FPC connection destination circuit board part 22.

  In addition, circuit blocks for inputting and outputting signals are prepared in the circuit board portions of the FPC connection source circuit board portion 21 and the FPC connection destination circuit board portion 22, respectively. In order to connect to the respective circuit blocks of the FPC connection source circuit board part 21 and the FPC connection destination circuit board part 22, the FPC connection parts of the FPC connection source circuit board part 21 and the FPC connection destination circuit board part 22 include connection terminals. 23A is prepared and can be connected to the connection terminal 23 and the redundant connection terminal 24 on the FPC1 side.

  Here, if any of the wirings 2 on the FPC 1, for example, the wiring (Signal-3) is disconnected due to external stress or the like, the redundant wiring part (Dummy), that is, the redundant wiring part 3 provided on the FPC 1 is replaced. For the redundant connection, the connection terminal 23 on the FPC 1 side disposed opposite to the connection terminal 23 of the FPC connection source circuit board part 21 and the connection terminal 23A of the FPC connection destination circuit board part 22 is used for redundant connection. By electrically connecting the connection terminal 23 of the disconnected wiring (Signal-3) and the redundant wiring section (Dummy), that is, the redundant connection terminal 24 of the redundant wiring section 3, using the terminal 24 The wiring part 2 can be replaced by the redundant wiring part 3.

  Thereby, it is possible to repair the disconnected wiring without replacing the FPC 1 that is difficult to replace. In the embodiment described above with reference to FIG. 3, the redundant wiring portion (Dummy), that is, the redundant wiring portion 3 is described as one line. However, by preparing a plurality of redundant wiring portions 3, any one of them can be obtained. It is possible to cope with a plurality of disconnections of the wiring section 2 on the FPC 1 by connecting the selected redundant wiring section instead of the disconnected wiring (Signal-3).

  Also, redundant connection terminals are arranged on the circuit board side of the FPC connection source circuit board part 21 and the FPC connection destination circuit board part 22 corresponding to the redundant connection terminal 24 on the FPC 1 side illustrated in FIG. The redundant connection terminal 24 may be connected. In this case, when a disconnection occurs in any wiring of the wiring portion 2 on the FPC 1 side, for example, the wiring (Signal-3), both of the fixings connected to the wiring (Signal-3) instead of the FPC1 side are fixed. The connection can be switched by connecting the connection terminal 23A on the board side and the redundant connection terminal on each fixed board side by a jumper wiring. Thus, workability can be improved by performing wiring work on a non-plastic fixed substrate.

  Further, one or a plurality of redundant wiring portions (Dummy) on the FPC 1, that is, the redundant wiring portion 3 are arranged outside the wiring layer on the FPC 1, that is, the wiring portion 2 so as to cover the wiring portion 2 from the outside. You may do it. Thereby, in the normal state, the redundant wiring part 3 that does not transmit / receive signals is in a state of covering the outside of the wiring part 2 that performs signal transmission / reception, so that the reliability of the FPC 1 can be improved.

(Description of operation of the embodiment)
Next, the switching operation to the redundant wiring part 3 in FIG. 3 will be further described. The wiring layer on the FPC 1 connected to, for example, the wiring (Signal-3) on the circuit board of the FPC connection source circuit board unit 21 and the FPC connection destination circuit board unit 22, that is, the wiring unit 2 is disconnected due to the influence of external stress or the like. FPC connection part on the circuit board of FPC connection source circuit board part 21 and FPC connection destination circuit board part 22 or FPC connection destination circuit board part 22, that is, for connection Using the terminal 23A and the redundant connection terminal, the redundant wiring portion (Dummy) on the FPC 1, that is, the redundant wiring portion 3 and the wiring (Signal-3) are connected to the FPC 1 using a conductor such as 0 & resistance. Alternatively, the FPC connection source circuit board unit 21 and the FPC connection destination circuit board unit 22 may be connected to each other or between the FPC 1 and the circuit board. Cormorant.

  As a result, the wiring portion disconnected on the FPC 1 is bypassed, and a signal transmission path is formed via the redundant wiring portion (Dummy) on the FPC 1, that is, the redundant wiring portion 3, as before the disconnection.

(Explanation of effect)
As described above, in the present invention, the following effects can be achieved.

  The first effect is that the function of the FPC can be recovered without replacing the FPC itself, so that the FPC cost associated with repair and the human cost of repair work can be greatly reduced.

  The second effect is that it is not necessary to prepare special equipment for the FPC repair, so that the cost required for the equipment can be reduced and the time required for the repair can be shortened.

(Other examples)
In another embodiment of the present invention, the basic configuration is the same as that of the above-described embodiment, but an example using an LSI capable of controlling terminal assignment change in software will be described. That is, in this embodiment, the I / O that can change and assign the input / output position of the signal to the connection terminal and the redundant connection terminal on the fixed board side connected to the wiring part 2 and the redundant wiring part 3 of the FPC 1 respectively. As an allocation control method for performing change allocation control of the I / O port, an LSI having an I / O port allocation control program is provided. By executing the I / O port assignment control program in the LSI, the I / O port (signal line) assigned to the disconnected wiring in the wiring part 2 is assigned to the redundant wiring part 3. By reassigning to the port (signal line), it is possible to repair the disconnected wiring without performing hardware repair using the jumper wiring as in the above-described embodiment.

  FIG. 4 is a schematic view showing another embodiment of a circuit configuration using a flexible wiring board (FPC) according to the present invention. In FIG. 4, reference numeral 31 denotes an FPC connection source circuit board part, reference numeral 1 denotes an FPC, and reference numeral 32 denotes an FPC connection destination circuit board part. Reference numeral 33 denotes an LSI capable of I / O port assignment control. Each I / O port of the FPC connection source circuit board unit 31 and the FPC connection destination circuit board unit 32 is connected to the wiring unit 2 on the FPC 1 and redundant. It is electrically connected via the wiring part 3.

  When any of the wirings 2 on the FPC 1 such as the wiring (GPIO-1) is disconnected due to external stress or the like, the redundant wiring part (GPIO-4) provided on the FPC 1, that is, the redundant wiring part 3 is used as an alternative. For this purpose, the I / O port assignment is changed by software under the control of the I / O port assignment control program of the LSI 33 of each of the FPC connection source circuit board unit 31 and the FPC connection destination circuit board unit 32. Specifically, the I / O port (signal line) assigned as the connection terminal for the disconnected wiring (GPIO-1) was assigned as the redundant connection terminal for the redundant wiring section (GPIO-4). Reassign to I / O port (signal line). As a result, the signal that has been transmitted / received to / from the LSI 33 through the wiring (GPIO-1) is switched to a state in which the signal is transmitted / received through the redundant wiring section (GPIO-4).

  As a result, the disconnected wiring part 2 on the FPC 1 can be switched to the redundant wiring part 3 only by changing the I / O assignment in the LSI without adding hardware-related repair / correction. Time can be shortened.

  The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such examples are merely illustrative of the invention and do not limit the invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention.

It is a schematic diagram which shows an example of the flexible wiring board (FPC: Flexible Printed Circuit) by this invention. It is a schematic diagram which shows an example of the circuit board carrying the flexible wiring board (FPC) by this invention. It is a schematic diagram which shows one Example of the circuit structure using the flexible wiring board (FPC) by this invention. It is a schematic diagram which shows the other Example of the circuit structure using the flexible wiring board (FPC) by this invention.

Explanation of symbols

1 FPC
2 Wiring part 3 Redundant wiring part 11 Board side circuit block 12 FPC connection destination circuit board part 21 FPC connection source circuit board part 22 FPC connection destination circuit board part 23 Connection terminal 23A Connection terminal 24 Redundant connection terminal 31 FPC connection source Circuit board part 32 FPC connection destination circuit board part 33 LSI

Claims (10)

  In the flexible wiring board having one or more wiring parts for connecting the circuit boards, the flexible wiring board further has one or more redundant wiring parts, and when any of the wiring parts is disconnected, the disconnected wiring part is A flexible wiring board, which is replaced by a redundant wiring portion.   The flexible wiring board according to claim 1, wherein the redundant wiring portion is disposed outside the wiring portion.   A connection terminal for connecting the wiring part to the circuit board and a redundant connection terminal for replacing the redundant wiring part with the wiring part, and when any of the wiring parts is disconnected A jumper between the connection terminal of the disconnected wiring section or the wiring on the circuit board connected to the connection terminal and the redundant connection terminal selected from the redundant connection terminals. The flexible wiring board according to claim 1, wherein the flexible wiring board is connectable by wiring.   In a circuit board connected to each other via wiring of a flexible wiring board, a connection terminal for connecting to one or more wiring parts of the flexible wiring board, one or more redundant wiring parts of the flexible wiring board, A circuit board having a redundant connection terminal for connection.   When one of the wiring sections of the flexible wiring board is disconnected, a jumper wiring is provided between the connection terminal connected to the wiring section and the redundant connection terminal selected from the redundant connection terminals. The circuit board according to claim 4, wherein the circuit board can be connected.   The flexible wiring includes an LSI having the connection terminal and the redundant connection terminal as an I / O port capable of changing and assigning a signal input / output position, and performing change assignment control of the I / O port. When one of the wiring portions of the substrate is disconnected, the I / O port corresponding to the connection terminal connected to the wiring portion is controlled by the LSI, and the I / O corresponding to the redundant connection terminal is controlled. The circuit board according to claim 4, wherein the connection terminal and the redundant connection terminal are switched by reassigning to a port. A repair method at the time of flexible wiring disconnection for repairing disconnection occurring in any of one or a plurality of wiring portions of a flexible wiring substrate connecting between circuit boards,
The flexible wiring board further includes one or more redundant wiring portions, and when any of the wiring portions is disconnected, the disconnected wiring portion is replaced by the redundant wiring portion. Repair method in case of disconnection.   8. The method for repairing a broken flexible wiring according to claim 7, wherein the redundant wiring portion is disposed outside the wiring portion.   A connection terminal for connecting the wiring part to the circuit board and a redundant connection terminal for replacing the redundant wiring part with the wiring part, and when any of the wiring parts is disconnected A jumper between the connection terminal of the disconnected wiring section or the wiring on the circuit board connected to the connection terminal and the redundant connection terminal selected from the redundant connection terminals. 9. The method for repairing a broken flexible wiring according to claim 7, wherein the wiring is connectable by wiring. By having the connection terminal and the redundant connection terminal as I / O ports capable of changing and assigning signal input / output positions, and by controlling the assignment control step for performing change assignment control of the I / O ports, When any one of the wiring portions of the flexible wiring board is disconnected, the I / O port corresponding to the connection terminal connected to the wiring portion is assigned to the I / O port corresponding to the redundant connection terminal. 9. The repair method at the time of disconnection of a flexible wiring according to claim 7, wherein the connection terminal and the redundant connection terminal are switched by correcting.

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