JPH01230286A - Check pad for flexible printed board - Google Patents

Abstract

PURPOSE:To enable high density mounting, and miniaturize an electronic device, by providing the rear of a connection terminal part with a circuit check terminal constituted of the electrically the same electric conductivity pattern as the terminal. CONSTITUTION:A first flexible printed board 1 has conductors 4, 6 on both surfaces, and is exposed as a connection terminal part to a second flexible printed board 2. The connection terminal part of the second board 2 is formed of a conductor 10 at a position facing the connection part of the conductor 6. On the rear of the connection part of the board 1, a circuit check terminal part is formed of the conductor 4. The conductor 6 and the conductor 4 are electrically connected by a through hole connection part 8. In order to perform checking, a check probe pin 17 is abutted on the conductor 4, and the adjustment and checking of a circuit are performed. In this case, it is necessary to apply a pressure to the pin 17 with force cutting into the conductor 4.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a check pad for circuit inspection and adjustment of a flexible printed board.

(Prior technology) Recently, electric circuits have become more densely packaged, and circuit inspection and circuit adjustment during the work process have become more complex. The number of check terminals (pads) for transmitting signals and extracting signals has increased.

On the other hand, as the scale of circuits has increased and it has become impossible to fit on a single flexible printed board, and it has become necessary to connect to other circuit boards, it has become necessary to connect conductors between flexible printed boards and other circuit boards. between each other,
A connection method is used that applies pressure and presses down to establish electrical continuity.

In this connection method, if pressure is not uniformly applied to each of the connection parts and sufficient to establish continuity, accidents such as connection failure may occur.

For this reason, the flatness of the connection terminal portion is important, and care must be taken to avoid scratches and dirt.

Furthermore, in order to ensure continuity by applying local pressure to the terminal portion, there is also an example in which a rib-shaped projection is provided on the holding member in a direction perpendicular to the longitudinal direction of the terminal to deform the flexible printed board.

(Problems to be Solved by the Invention) As mentioned above, for flexible printed boards that require both circuit check terminals and circuit connection terminals, if both can be used, wiring can be simplified, space can be used more effectively, etc. There are advantages.

However, the connection terminal portion could not be used both as a check terminal and a circuit connection terminal because scratches caused when a checking probe bottle is brought into contact with the connecting terminal portion may cause a connection failure.

Therefore, although the signal wiring is the same, it was necessary to prepare terminals for checking and for connection. Also, when pressing a probe pin against a check terminal to make electrical measurements, it is necessary to apply pressure to a sharp pin to ensure a secure connection, which may damage the conductor or base film.
In double-sided flexible printed boards, there was a risk of electrical conduction with the conductor on the back side.

For these reasons, in double-sided flexible printed circuit boards, it is dangerous to place wiring conductors or other terminals on the back side of the check terminals, which is a problem because it wastes space and prevents high-density mounting. After.

The present invention attempts to solve these problems. That is, an object of the present invention is to provide a check pad for a flexible printed board that can achieve highly space-efficient mounting and also provide reliable connection and conduction.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a flexible printed board in which the terminals of a flexible printed board and another printed board are brought into contact and connected by applying pressure, and the present invention is provided with A circuit check terminal consisting of the same electrically conductive pattern as the terminal was placed.

(Function) According to the present invention, the circuit check terminals having the same electrical continuity pattern as the terminals are arranged on the back side of the connection terminal portion of the flexible printed board, so that high-density mounting with high space efficiency is possible. Moreover, reliable connection and conduction can be achieved by the projections formed on the connection terminals of the flexible printed board by pressing the probe pins during circuit checking.

(Embodiment) FIGS. 1 to 4 show a first embodiment of the present invention.

In FIG. 1, 1 is a first flexible printed board;
2 is a second flexible printed board.

The first flexible printed board 1 includes a coverlay film 3, a conductor 4 on the first surface, a base film 5, a conductor 6 on the second surface, a coverlay film 7, and a through-hole connection portion 8.

The second flexible printed board 2 includes a coverlay film 9, a conductor 10, and a base film 11.

Further, 12 is a pressing member, 13 is an elastic member, 14 is a suppressing member, and 15 is a dent to be described later.

Also, 16 shown in Figure 2 is tightened with a screw, and Figures 3 and 4 are used for tightening.
Reference numeral 17 shown in the figure is a probe pin for checking the circuit.

That is, the screws 16 are used for tightening, and the opposing conductors 6.degree. 10 of both flexible printed boards 1 and 2 are pressed together under pressure. Also, since the probe pin 17 for circuit checking is pressed against the first flexible printed board 1, a dent 15 is formed on the flexible printed board 1, but it is a recess on the conductor 4 side and a recess on the conductor 6 side. appears as a convex part.

To explain further, the first flexible printed board 1 is a double-sided flexible printed board with conductors 4 and 6 on both sides, and a portion of the conductor 6 is exposed as a connection terminal with the second flexible printed board 2. There is. conductor 6
A connect terminal portion of the second flexible printed board 2 is formed of a conductor 10 at a position facing the connect portion. The coverlay film 7.9 has been removed from the connecting portions of the conductors 6.10, and treatments such as gold plating have been applied to prevent rust and ensure connection reliability. 1st
A terminal section for circuit checking is formed with a conductor 4 on the back side of the connecting section of the flexible printed board 1. The connection terminal group made up of the conductor 6 and the check screw group made up of the conductor 4 are formed in substantially the same shape with the base film 5 in between, and are electrically connected to each other by the through-hole connection part 8,
kept at the same potential.

In order to electrically adjust and check the circuit (not shown) configured on the first flexible printed board 1, as shown in FIG. 3, a checking probe bin 17 (probe bin group) is installed. Check conductor 4 (
(terminal group) to adjust and check the circuit. Note that the other end of the probe pin 17 is connected to a check circuit (not shown).

In order to perform an electrical check reliably, it is necessary to ensure conduction between the conductor 4, which is a check terminal, and the probe pin 17, and for this reason, it is necessary to apply pressure to the extent that the probe pin 17 bites into the conductor 4. This allows the fourth
As shown in the figure, the conductor 4 of the first flexible printed board 1. Base film 5. The conductor 6 is deformed, and a concave portion is formed on the conductor 4 and a convex portion is formed on the conductor 6. At this time, there is a possibility that the base film 5 is damaged and the conductor 4 and the conductor 6 become electrically connected.
As mentioned above, conduction is established through the through-hole connection portion 8, and there is no problem.

In this way, since the same potential terminal for connection is provided on the back side of the check terminal, there is no fear that the dents 15 of the probe pins 17 will electrically adversely affect the wiring on the back side.

In this state, as shown in Figures 1 and 2,
The corresponding connection terminal parts of the first flexible printed board 1 and the second flexible printed board 2 are stacked facing each other, and in order to equalize the pressure, an elastic member 13 such as garbage is sandwiched between the suppressing members. Tighten and secure with 12.14 and screw 16.

In this embodiment, as shown in FIG. 2, each member is positioned by a screw hole, and the screw 16 is fastened to a female thread cut in the pressing plate 14.

When the screws 16 are tightened until the elastic member 13 is sufficiently deformed, equal pressure is applied to the connection terminal groups of both flexible printed boards 1.2, and electrical continuity is established.

However, if a thin oxide film of nonconductor is formed on the surface of the connect terminal, or the flatness of the terminal is poor,
If the contact pressure is weak, the oxide film may not be broken, or some terminals may remain floating due to one-sided contact, which may cause a connection failure. Therefore, as the tightening force of the screw 16 increases and the deformation of the elastic member 13 increases,
The pressing members 12 and 14 deform into an arched shape under the pressure of the elastic member 13, and even if sufficient pressure is generated around the screw 16, a connection failure occurs near the middle between one screw 16 and the other screw 16. there is a possibility. For this reason, it is necessary to have a structure in which pressure is applied uniformly to the group of connect terminals with the weakest possible tightening force.

In the present invention, the dents 15 made by the probe pins 17 are useful for reliable connection.

That is, since the dent 15 is always formed as a convex portion on the conductor 6 side of the connect terminal, when the conductor 6 and the conductor 10 are pressed together, the pressure is localized around the convex portion of the dent 15 compared to other areas. It becomes expensive.

Therefore, if the entire connect terminal portion is averaged, even in a not-so-high pressure state, reliable conduction is achieved around the convex portion of the dent 15, and the above-mentioned defects such as poor connection are eliminated.

In this embodiment, the elastic member 13 is arranged between the second flexible printed board 2 and the pressing member 14, but even if it is arranged between the first flexible printed board 1 and the pressing member 12, You can get the same effect. In addition, another printed board connected to the first flexible printed board 1 is connected to the second flexible printed board 1.
Although the case is shown in which the flexible printed board 2 is used, the same effect can be obtained even if the other printed board is a rigid printed board.

FIG. 5 shows a second embodiment of the invention, in which the probe bin 17
Indicates that the tip is formed into multiple protrusions. Using such a probe bin 17 not only increases the connection reliability during checking, but also allows a plurality of convex portions of the dents 15 formed on the first flexible printed board 1 to be formed on one terminal. Therefore, the contact pressure at multiple points increases during connection, improving connection reliability.

FIG. 6 shows a third embodiment of the invention.

In this third embodiment, the present invention is applied to a connector structure in which the screws 16 are arranged radially around the screws 16 in order to uniformly apply force to the terminals when tightening with the screws 16. In this way, the connection terminal group and the check terminal group do not have to be arranged in a straight line, but can be arranged radially or in other shapes.
The present invention can be applied.

〔Effect of the invention〕

As explained above, according to the present invention, a circuit check terminal made of the same electrically conductive pattern as the terminal is arranged on the back side of the connection terminal part of the flexible printed board, so it is dangerous to wire it in the conventional way. The back side of the check terminal section, which used to be a wasted space, can be used effectively, enabling high-density mounting, which is effective in miniaturizing electronic devices, and is formed by pressing the probe pin for circuit checking. The convex portion allows reliable connection and conduction of the connecting portion by tightening with a relatively small amount of force, which is effective in improving the reliability of electronic equipment.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG.
2 is an exploded perspective view of the flexible printed board of the embodiment when connected; FIG. 3 is a perspective view of the same when checking the circuit; FIG. 4 is a sectional view of the same when checking the circuit;
FIG. 5 is a sectional view of the second embodiment when checking the circuit, and FIG. 6 is an exploded perspective view of the third embodiment. 1.2...Flexible printed board 3...Coverlay film 4...Conductor 5...Base film 6...Conductor 7...Coverlay film 8...Through hole connection part 9...・Coverlay film 10...Conductor 11...
Base film 12...pressing member 13...elastic member 14...pressing member 15...dents
16... Screw 17... Probe pin Figure 1 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. In a flexible printed board in which terminals of a flexible printed board and another printed board are brought into contact with each other and applied pressure to establish continuity, the back side of the connection terminal section is provided with electrically connected terminals to the terminals. A flexible printed board check pad characterized by having circuit check terminals arranged in the same conductive pattern. 2. The check pad for a flexible printed board according to claim 1, wherein the other printed board is a flexible printed board. 3. The check pad for a flexible printed board according to claim 1, wherein the other printed board is a rigid printed board.