JP3381098B2 - Structure of connector insertion part of flexible board - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a flexible substrate on which an input / output terminal group of a sensor integrated circuit composite element such as an MR sensor is formed, and more particularly to a flexible substrate (hereinafter appropriately referred to as FPC). The present invention relates to a structure of a connector insertion portion of a flexible substrate, which is improved in structure of the connector insertion portion to prevent discontinuity due to peeling of a base film or a conductor and short circuit between conductors.

[0002]

2. Description of the Related Art Generally, an FPC on which an input / output terminal group of a sensor integrated circuit composite element is formed is a polyimide (PI).
Etc. and an electrically conductive layer such as copper. This F
The connector insertion portion of the PC has a structure as shown in FIG.

FIG. 4 is a diagram showing a general structure of a conventional FPC connector insertion portion, in which (1) is a front view and (2) is a side view. In the figure, 1 is a reinforcing plate, 2
Is a base film, 3 is a conductor, 4 is a cover film, 5
Indicates an adhesive layer, L indicates the length of the conductor 3 (length of exposed portion),
W indicates the width of the connector insertion portion, and T indicates the thickness of the connector insertion portion.

In the connector insertion portion of the conventional FPC shown in FIGS. 4 (1) and 4 (2), the reinforcing plate 1, the base film 2,
The ends of the conductors 3 are all arranged on the same plane. More specifically, the connector insertion portion of this FPC is an F in which the input / output terminal group of the integrated circuit composite element is formed.
This is a connection terminal for the PC board, and is inserted into the contact of the mating connector.

The structure is such that a base film 2, a plurality of strip-shaped conductors 3 corresponding to each terminal of the input / output terminal group, and a conductor 3 on each terminal side of the input / output terminal group are provided on a reinforcing plate 1. And a cover film 4 for covering them are integrally formed with each other with an adhesive layer 5 interposed therebetween. As shown in Figs. 4 (1) and (2), the connector insertion part of this FPC has a width of the reinforcing plate 1 in the lateral direction of W, a thickness of the connector insertion part on the distal end side is T, and If the length of the strip-shaped conductor 3 provided above is L, for example, W = 4.5 mm, T = 0.3 mm, L =
It is about 2.5 mm.

Further, in FIG. 4 (1), the conductor 3 is composed of eight strips (the input / output terminal group of the integrated circuit composite element is also eight), and the width of each conductor 3 is 0.3 mm. In each case, the conductors 3 are arranged with a space (space) of about 0.15 mm. In addition, each conductor 3 of this connector insertion portion is covered with a cover film 4 on the input / output terminal side (the integrated circuit composite element side in the lower part of the figure).

The connector insertion part is shown in FIGS. 4 (1) and 4 (2).
As shown in, the width is W = 4.5 mm and the thickness is T
= 0.3 mm, which is extremely small. And
At the connector insertion end (upper part in the drawing), the reinforcing plate 1, the base film 2, the conductor 3, and the cut surface of the adhesive layer 5 provided between them are formed in the same plane.

As described above, the connector insertion portion is extremely small and has a thin structure. When assembling this connector insertion part into the mating connector, it is not always used in a state in which both are in the vertical direction, and the connector insertion part is inserted obliquely to the connector contact. It often happens that

FIG. 5 is a side sectional view showing an example of inserting a connector insertion portion of a conventional FPC into a connector.
It is a figure which shows the state which the connector insertion part was diagonally inserted with respect to the connector contact part. In the figure, 11 is an FPC connector insertion part, 12 is a connector contact part, and 13 is a connector mold part.

As shown in FIG. 5, the connector includes a connector contact portion 12 and a connector mold portion 1.
3 and the connector contact portion 12
Is arranged at the center of the connector mold portion 13. However, the connector insertion portion 11 of the FPC is connected to the connector contact portion 12 as shown in FIG.
If it is inserted in an oblique direction, there is a risk that the conductor 3 and the base film 2 forming the connector insertion portion 11 may be peeled off.

If the tip of the conductor 3 or the base film 2 on the connector insertion portion 11 side is peeled off, it may cause a non-conduction of the circuit system or a short between conductors. The cause of the short circuit between the conductors is shown in FIG.

FIG. 6 is a diagram for explaining a state of short circuit between conductors due to conductor peeling in a connector insertion portion of a conventional FPC. In the figure, 3a to 3c indicate conductor pieces of the adjacent conductors 3.

As shown in FIG. 6, in the connector insertion portion of the FPC, the conductor pieces 3a to 3 of the conductors 3 adjacent to each other.
If the tip of one of the conductor pieces 3b in c is peeled off due to, for example, oblique insertion, the adjacent conductor pieces 3b
Shorts by contacting a (or 3c). As described above, in the conventional FPC connector insertion portion, as shown in FIG.
As described above, the conductor 3 and the base film 2 may be clogged at the tips thereof, or the phenomenon described with reference to FIG.
As a method for avoiding such an inconvenience, a structure in which the base film 2 is not peeled off is also conceivable. For example, as shown in FIG. 7 below, the tip of the relatively strong reinforcing plate 1 may be projected more than other base films 2 and conductors 3, or the upper surface of the tip may be inserted as shown in FIG. Similar to the output terminal side (the integrated circuit composite element side in the lower part of the figure), a measure of covering with a cover film (4 in FIG. 6) can be considered.

FIG. 7 is a view showing an example of a structure for preventing the base film 2 from being peeled off at the connector insertion portion of the FPC. (1) is a front view and (2) is a side view. Reference numerals in the figure are the same as those in FIG. 4, and reference numeral 1a indicates a protruding portion of the reinforcing plate 1.

As shown in FIGS. 7 (1) and 7 (2), the end portion of the reinforcing plate 1 is extended, and the protruding portion 1a protruding from the tip portions of the base film 2 and the conductor 3 is provided to connect the connector. If the insertion portion is configured, it is possible to prevent the occurrence of peeling of the tip of the conductor 3 and the base film 2 as shown in FIG. However, even with such a structure, in the connector insertion portion of the FPC having a narrow conductor pitch (for example, about 0.5 mm in the case of FIG. 6), the bonding area between the conductor and the base film is reduced. It cannot be said that this is an effective method for the conductor peeling caused.

FIGS. 8A and 8B are views showing another example of the structure for preventing the base film 2 and the conductor 3 from being peeled off at the connector insertion portion of the FPC. FIG. 8A is a front view and FIG. 8B is a side view. Reference numerals in the figure are the same as those in FIG. 4, and 4'denotes a second cover film.

The structure for preventing peeling of the base film 2 and the conductor 3 at the connector insertion portion of the FPC is as follows.
As shown in Fig. 8 (1) and (2), at the tip of the conductor 3,
It is also conceivable to provide a second cover film 4'having the same structure as the cover film 4. In this way, if the tip end portion of the conductor 3 is covered with the second cover film 4 ', a temporary effect can be expected, but in such a configuration, the conductor 3 is covered with the second cover film 4'. There is also a possibility that it will be lost, so it is not always a sufficient measure.

[0018]

[Problems to be Solved by the Invention] As described above,
In the conventional flexible board connector insertion part, when the user connects to the connector, the board connector insertion part is not always inserted in the correct direction, so the tip of the connector insertion part of the board is peeled off and the circuit There was the inconvenience of system non-conduction and short-circuiting between conductors. The present invention solves such an inconvenience, and even when the pitch between the conductors is narrow at the time of insertion into the connector (for example, 0.5 mm pitch or less: the pitch corresponds to the interval between the center lines between the adjacent conductors 3). It is an object of the present invention to provide a structure of a connector insertion portion of a flexible substrate in which the tip of the connector insertion portion is not peeled off to prevent a non-conduction of a circuit system and a short circuit between conductors.

[0019]

According to the present invention, firstly,
A substrate on which an input / output terminal group of an integrated circuit composite element is formed, a base film, a plurality of strip conductors corresponding to each terminal of the input / output terminal group, and the input / output terminal in a reinforcing plate shape. A cover film covering the conductor on each terminal side of the group, in a connector insertion portion of a flexible substrate integrally formed via an adhesive layer, the connector insertion-side end portion of the reinforcing plate, the base film and A second cover film that is separated from the cover film by protruding from the cut surface of the tip end of the conductor on the connector insertion side,
Wherein the base film and the conductor connector insertion side the distal end portion of the cut surface and the same surface position, and is formed through an adhesive layer to the upper surface of the conductor, the connector insertion of the reinforcing plate
The protruding part of the side tip is left and right with respect to the connector insertion direction.
The configuration is such that only the positions at both ends are provided.

Second, the input / output terminal group of the integrated circuit composite element
Is the substrate on which the base film is formed
And a plurality of strips corresponding to each terminal of the input / output terminal group
And the conductor on each terminal side of the input / output terminal group.
The cover film is integrated with the adhesive layer.
On the connector insertion part of the flexible board formed on
The tip of the reinforcing plate on the connector insertion side is
Of the end of the connector insertion side of the base film and the conductor
The second protrusion that is more protruded and separated from the cover film.
The cover film is a connection between the base film and the conductor.
Of the input / output terminal group from the cut surface of the front end on the insertion side
At the position of the terminal side and on the upper surface of the conductor with an adhesive layer
It is configured to be formed by .

Third, the input / output terminal group of the integrated circuit composite element
Is the substrate on which the base film is formed
And a plurality of strips corresponding to each terminal of the input / output terminal group
And the conductor on each terminal side of the input / output terminal group.
The cover film is integrated with the adhesive layer.
On the connector insertion part of the flexible board formed on
The tip of the reinforcing plate on the connector insertion side is
Of the end of the connector insertion side of the base film and the conductor
The second protrusion that is more protruded and separated from the cover film.
The cover film is a connection between the base film and the conductor.
Of the input / output terminal group from the cut surface of the front end on the insertion side
At the position of the terminal side and on the upper surface of the conductor with an adhesive layer
Formed on the connector insertion side of the reinforcing plate.
The protrusions are located at the left and right ends with respect to the connector insertion direction.
It is a configuration that is only like.

[0022]

According to the present invention, in the conventional FPC connector, the main cause of peeling at the tip of the connector when it is inserted into the connector is that the tip of the reinforcing plate 1 on the connector insertion side is as shown in FIG. The base film 2 and the conductor 3 are on the same surface as the cut surface of the tip end portion of the connector insertion side, and the cover film 4 is provided only below the connector insertion portion (each terminal side of the input / output terminal group). This is because the cutting surface of the tip of the reinforcing plate 1 on the connector insertion side is not attached to the base film 2 or the conductor 3.
The second cover film separated from the cover film 4 is made to be one surface of the connector insertion side tip of the base film 2 and the conductor 3 while being made to protrude from the cut surface of the connector insertion side tip of the connector (not shown). In position,
In addition, it is formed on the upper surface of the conductor 3 via an adhesive layer (the invention of claim 1).

In this case, from the viewpoint that the same effect can be obtained even if the projecting piece at the connector insertion end of the reinforcing plate 1 is not necessarily provided over the entire width of the connector insertion portion.
It is arranged to be provided only at the left and right ends ( claim 1).
Or the invention of claim 3 ). Further, from the viewpoint that the same effect can be obtained even when the attachment position of the second cover film does not necessarily coincide with the cut surfaces of the connector insertion side tip portions of the base film 2 and the conductor 3, the second cover film is obtained. of the cut surface of the connector insertion side leading end portion, and the position of each terminal side of the input and output terminals (claim 2, wherein
Invention of Item 3 ).

[0024]

Embodiment 1 Next, the structure of the connector insertion portion of the flexible substrate of the present invention will be described in detail with reference to the drawings. This embodiment includes claims 1 to
It is the basis of the invention of claim 3. In this embodiment, in the structure of the connector insertion portion of the FPC shown in FIG. 4 as a conventional example, the tip of the reinforcing plate 1 on the connector insertion side is projected beyond the base film 2 and the conductor 3.
Another feature is that a similar second cover film, which is separated from the cover film 4 for preventing the conductor 3 from peeling off, is provided at the connector insertion-side end portion.

FIGS. 1A and 1B are views showing an embodiment of the structure of the connector insertion portion of the FPC of the present invention, in which (1) is a front view and (2) is a side view. Reference numerals in the figure are the same as those in FIG.
Indicates a second cover film.

The structure of the connector insertion portion of the FPC shown in FIGS. 1 (1) and 1 (2) is similar to the connector insertion portion of FIG. It is common that the films 4 are integrally formed by the adhesive layers 5, respectively. However, in order to prevent the tip of the connector insertion part from being peeled off, as shown in Fig. 1 (1), at the tip of the reinforcing plate 1 on the side where the connector is inserted into the connector, a protruding part is formed over almost the entire width of the connector insertion part. 1
In addition to the addition of a, the upper surface of the conductor 3 is covered with a second cover film 4 ′ over almost the entire width of the connector insertion portion so that the tip of the conductor 3 on the insertion side into the connector is not peeled off. It is different.

As described above, the protruding portion 1 is provided at the tip of the reinforcing plate 1.
By providing a, the tip of the connector insertion portion forms a taper portion in the thickness direction when the connector insertion portion is inserted into the connector, so that the connector insertion portion can be replaced by the connector contact portion in the connector shown in FIG. When it is inserted into the connector 12, the insertion resistance is reduced even if it is not in the right angle direction, and the connector insertion portion is less likely to be peeled off. In addition,
Insertion resistance can be further reduced by providing appropriate roundness on both the left and right sides of the protrusion 1a. Moreover, the tip of the connector insertion portion is covered with the second cover film 4 ', as shown in FIGS. 1 (1) and 1 (2).

The protruding portion 1a of the reinforcing plate 1 has, for example, a lateral width (W) of the connector insertion portion of W = 4.5 mm and a thickness (T) of the connector insertion portion on the distal end side of T = 0. 3m
m, and the length (L) of the strip-shaped conductor 3 provided thereon is about L = 2.5 mm, the length of the protruding portion 1a is substantially equal to the thickness (T) of 0. The second cover film 4'may have a length (dimension in the vertical direction in FIG. 1) of about 0.5 mm in the vicinity of the center (the left and right ends are rounded). Therefore, according to the structure of the connector insertion portion of the flexible substrate of the present invention, there is no fear that the base film or the conductor peels off when the connector is inserted into the connector, and the non-conduction of the circuit system and the short-circuit between the conductors are prevented.

In particular, the tip of the connector insertion part is
Since it is covered with the cover film 4 ', even if the pitch between the conductors 3 becomes narrow, the possibility that the conductors 3 will be peeled off is extremely low. The second cover film 4'is
The input / output terminal group is made of the same material as the cover film 4 covering the conductor 3 on each terminal side (downward in FIG. 1), and is similarly bonded with an adhesive layer 5.

[0030]

Second Embodiment Next, a second embodiment will be described. This embodiment corresponds to the invention of claim 1 , but is also related to the invention of claim 3 . In the second embodiment, the first
In the embodiment, the protruding portion 1 provided at the tip of the reinforcing plate 1
The feature is that the shape of a is improved.

2A and 2B are views showing a second embodiment of the structure of the essential part of the structure of the connector insertion portion of the FPC of the present invention, wherein (1) is a front view and (2) is a side view. The reference numerals in the figure are the same as those in FIG. 4, and reference numerals 1b and 1c denote the protruding portions of the reinforcing plate 1.

As shown in FIG. 2 (1), in the second embodiment, the protruding portions 1b and 1c are provided at the tip end of the reinforcing plate 1 on the connector insertion side. The other structure is shown in FIG.
The same as shown in (1) and (2). This Figure 2 (1)
As shown in (2), even if the protruding portions 1b and 1c of the reinforcing plate 1 are provided at both left and right ends of the tip of the connector insertion portion, the same effect as in the first embodiment can be obtained.

[0033]

Third Embodiment Next, a third embodiment will be described. This embodiment corresponds to the invention of claim 2 , but is also related to the invention of claim 3 . In the third embodiment, the first
The second embodiment is characterized in that the mounting position of the second cover film 4'covering the upper surface of the conductor 3 is changed.

FIGS. 3A and 3B are views showing a third embodiment of the structure of the main portion of the structure of the connector insertion portion of the FPC of the present invention, (1) is a front view and (2) is a side view. Reference numerals in the figure are the same as those in FIG.

FIG. 3 is premised on the connector insertion portion shown in FIG. Therefore, the protruding portion 1a of the reinforcing plate 1 is formed on the tip end portion on the connector insertion side over substantially the entire width on the connector insertion side. In the third embodiment, the position of the second cover film 4'provided on the conductor 3 on the tip end side of the connector insertion part is prevented from being peeled off when the conductor 3 is inserted into the connector. Is moved slightly downward (the input / output terminal side).

That is, the cut surface of the tip portion of the second cover film 4'is set to a position closer to each terminal of the input / output terminal group than the cut surface of the tip portion of the base film 2 and the conductor 3 on the connector insertion side. There is. The other structure is the same as that of FIG. 1, and the function and effect thereof are also the same as those of FIG.

In this way, the cutting surface of the tip end portion of the second cover film 4'is located at a position closer to each terminal of the input / output terminal group than the cutting surface of the tip end portion of the base film 2 and the conductor 3 on the connector insertion side. This can be similarly performed in the structure described in the second embodiment, that is, in the case where the projecting portions 1b and 1c of the reinforcing plate 1 are provided at the left and right ends of the tip of the connector insertion portion. is there. As described above, it is possible to change the position of the second cover film 4'in the connector insertion portion of FIG. 2, and the same effect as that of FIG. 1 can be obtained.

[0038]

According to the structure of the connector insertion portion of the flexible substrate of claim 1, the connector insertion side tip of the reinforcing plate 1 is projected from the cut surface of the base film 2 and the conductor 3 at the connector insertion side, and Cover film 4
A second cover film 4'separated from the above is formed on the same surface as the cut surface of the base film 2 and the conductor 3 on the connector insertion side, and on the upper surface of the conductor 3 with an adhesive layer 5 interposed. is doing.

Therefore, unlike the conventional connector insertion portion, the inconvenience that the base film or the conductor peels off when the connector is inserted into the connector is avoided, and the non-conduction of the circuit system and the short-circuit between the conductors can be prevented. . Moreover, since the conductors 3 are not peeled off even if the pitch between the conductors 3 is narrowed, it is possible to prevent short-circuiting between the conductors, and the number of repair steps is also unnecessary.

Moreover, the connector of claim 1 or claim 3
In the structure of the connector insertion portion, the connector insertion side tip of the reinforcing plate 1 is projected from the cut surface of the connector insertion side tip of the base film 2 and the conductor 3 only at the left and right ends with respect to the connector insertion direction. There is. With such a configuration, the material of the reinforcing plate 1 can be saved .

Insertion of the connector according to claim 2 or 3
In the structure of the part, the connector insertion side tip of the second cover film 4 ′ is provided at a position closer to each terminal of the input / output terminal group than the cut surface of the base film 2 and the conductor 3 at the connector insertion side. ing. As described above, even if the position of the second cover film 4'is changed, the same effect as the structure of the connector insertion portion of the first aspect can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a main part configuration of a structure of a connector insertion portion of an FPC of the present invention.

FIG. 2 is a diagram showing a second embodiment of the configuration of the main part of the structure of the connector insertion portion of the FPC of the present invention.

FIG. 3 is a diagram showing a third embodiment of the configuration of the essential parts of the structure of the connector insertion portion of the FPC of the present invention.

FIG. 4 is a diagram showing a general structure of a connector insertion portion of a conventional FPC.

FIG. 5 is a side sectional view showing an example of inserting a connector insertion portion of a conventional FPC into a connector, showing a state where the connector insertion portion is obliquely inserted with respect to a connector contact portion.

FIG. 6 is a diagram illustrating a state of short-circuiting between conductors due to conductor peeling in a connector insertion portion of a conventional FPC.

FIG. 7 is a diagram showing an example of a structure for preventing peeling of the base film 2 in the connector insertion portion of the FPC.

FIG. 8 is a diagram showing another example of a structure for preventing peeling of the base film 2 and the conductor 3 in the connector insertion portion of the FPC.

[Explanation of symbols]

1 Reinforcement plate 1a Projection of reinforcing plate 1 1b Reinforcement plate 1 protrusion 1c Projection of reinforcing plate 1 2 base film 3 conductors 4 cover film 4'second cover film 5 Adhesive layer

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01R 23/68 H01R 23/66

Claims (3)

(57) [Claims] 1. A substrate on which an input / output terminal group of an integrated circuit composite element is formed, a reinforcing film, a base film, and a plurality of strip-shaped conductors corresponding to the terminals of the input / output terminal group. A cover film covering the conductor on each terminal side of the input / output terminal group, a connector insertion portion of a flexible substrate integrally formed via an adhesive layer, wherein the connector insertion-side tip portion of the reinforcing plate is A second cover film protruding from the cut surface of the base film and the conductor-side insertion end of the conductor, the second cover film separated from the cover film being flush with the cut surface of the base film and the conductor-side insertion end of the conductor. and at a position, and is formed through an adhesive layer to the upper surface of the conductor, the projecting part of the connector insertion side leading end portion of the reinforcing plate, connector
The structure of the connector insertion part of the flexible board, which is located only at the left and right ends with respect to the connector insertion direction . 2. An input / output terminal group of an integrated circuit composite element is formed.
It is a board that is
Multiple strip conductors corresponding to each terminal of the input / output terminal group
And a cover for covering the conductor on each terminal side of the input / output terminal group.
-The film and the film are integrally formed with an adhesive layer
In the connector insertion part of the flexible board, the tip of the connector insertion side of the reinforcing plate is
From the cut surface of the connector and the tip of the conductor
A second cover film that is released and separated from the cover film
Is the tip of the base film and conductor on the connector insertion side
Position of each terminal side of the input / output terminal group from the cut surface of the section
And is formed on the upper surface of the conductor through an adhesive layer.
Connector interpolation of the flexible substrate, characterized in that there
Structure of the entrance. 3. An input / output terminal group of an integrated circuit composite element is formed.
It is a board that is
Multiple strip conductors corresponding to each terminal of the input / output terminal group
And a cover for covering the conductor on each terminal side of the input / output terminal group.
-The film and the film are integrally formed with an adhesive layer
In the connector insertion part of the flexible board, the tip of the connector insertion side of the reinforcing plate is
From the cut surface of the connector and the tip of the conductor
A second cover film that is released and separated from the cover film
Is the tip of the base film and conductor on the connector insertion side
Position of each terminal side of the input / output terminal group from the cut surface of the section
And the protruding portion at the connector insertion side tip of the reinforcing plate is formed on the upper surface of the conductor with an adhesive layer.
It is only the position of the left and right end with respect compactors insertion direction
Of the flexible board connector insertion part
Structure.