JP3806390B2 - Conductive sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a conductive sheet, and can be applied, for example, when conducting conduction between terminals or removing static electricity charged on a metal.
[0002]
[Prior art]
In recent years, electronic devices have been rapidly downsized as represented by mobile terminals. For this reason, the wiring space for establishing conduction between terminals has also become limited. A conductive sheet has been proposed as a device that can easily conduct electricity between terminals in such a limited wiring space.
[0003]
For example, as shown in FIG. 8, a connection sheet for an electric circuit disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 10-241765) includes a flexible base film 2 made of a synthetic resin film and the like, and a base film It is comprised by the adhesive layer 3 formed in the one surface side, and the flexible conductive layer 4 formed in the surface of the adhesive layer 3. FIG.
[0004]
Thus, if the electrical circuit connection sheet 1 is used, even if there is unevenness between the terminals to be connected, the entire connection sheet 1 is deformed according to the uneven shape, and the conductive layer 4 electrically connects the terminals. It becomes possible to conduct. At this time, the adhesive layer 3 adheres to the terminal or the vicinity of the terminal, so that the contact between the conductive layer 4 and the terminal can be ensured.
[0005]
[Patent Document 1]
JP-A-10-241765 [0006]
[Problems to be solved by the invention]
By the way, what is particularly important in such a conductive sheet is to ensure contact between the conductive layer 4 and the terminal. For that purpose, the reliability of adhesion of the adhesive layer 3 is important.
[0007]
However, in the conventional conductive sheet, if the area of the adhesive layer 3 is increased in order to increase the reliability of bonding, the area of the conductive layer 4 must be reduced by that amount, and the connection between the conductive layer 4 and the terminal is increased. there is a and a Turkey is a problem that becomes difficult.
[0008]
If the adhesive state is kept for a longer time, there is a problem that the adhesive from the adhesive layer 3 enters the surface of the conductive layer 4 due to heat, stress or the like, and the reliability of the connection is lowered. In particular, when the area of the adhesive layer 3 is increased to increase the adhesive force and the area of the conductive layer 4 is reduced, the adhesive layer 3 may cover the surface of the conductive layer 4 and the reliability of connection. The decrease is significant.
[0009]
As described above, the conventional conductive sheet still has an insufficient problem in securing connection reliability.
[0010]
This invention is made | formed in view of this point, and it aims at providing the conduction | electrical_connection sheet which can fully ensure the reliability of a connection.
[0011]
[Means for Solving the Problems]
In order to solve such a problem, the conductive sheet of the present invention is a conductive sheet that is bonded to an electronic device and is connected to a metal located on a different plane of the electronic device by a conductive portion, and is made of an insulating material. The flexible sheet, the first and second connection portions arranged at positions facing the flat portion of the electronic device, and the first and second connection portions are connected, and the line width is the first and second A flexible conductive portion formed on the sheet having a line portion that is formed narrower than the width of the two connection portions and is disposed at a position facing a corner portion or a step portion of the electronic device; An adhesive portion formed at a position excluding the conductive portion on the same surface as the conductive portion of the sheet, and an adhesive area at the periphery of the line portion of the adhesive portion is larger than an adhesive area at the periphery of the connection portion The adhesive force at the periphery of the line portion is A configuration that was higher than the force.
In addition, the conductive sheet of the present invention is a conductive sheet that is bonded to an electronic device and is connected to a metal located on different planes of the electronic device by a conductive portion. The conductive sheet has a rectangular shape and is made of an insulating material. Connecting the first and second connecting portions and the first and second connecting portions formed apart from each other, and the line width of the first and second connecting portions. A flexible conductive part formed on the sheet having a line part formed narrower than the width, and an adhesive formed at a position excluding the conductive part on the same surface as the conductive part of the sheet An adhesive area at the periphery of the line portion is made larger than an adhesive area at the periphery of the connection portion, and the adhesive force at the periphery of the line portion is higher than the adhesive force at the periphery of the connection portion. Adopt the configuration.
According to these configurations, the connection portion can be reliably connected to the intended conductor, and the area of the line portion other than the connection portion is small, so that the reliability of bonding can be improved. As a result, the connection reliability is improved.
[0012]
The conductive sheet of the present invention employs a configuration in which a gap having a predetermined interval is provided between the conductive portion and the adhesive portion. According to this configuration, since the adhesive is prevented from entering the conductive portion by the gap, the connection reliability is further improved.
[0013]
The conductive sheet of the present invention adopts a configuration in which the surface of the line portion of the conductive portion is covered with an insulating material. According to this configuration, even when other conductors or electric circuits exist between the conductors intended for connection, the line portion can be prevented from contacting other conductors or electric circuits by mistake. Moreover, since the track portion does not directly contact other members, disconnection of the track portion due to wear is prevented.
[0014]
The conductive sheet of the present invention adopts a configuration in which the connection part of the conductive part is formed slightly thicker than the adhesive part. According to this configuration, since the connecting portion is pressed against the conductor to be connected by the bending force of the flexible sheet in a state where the bonding portion is bonded to the bonding surface, the reliability of the connection between the connecting portion and the conductor is high. Increased further.
[0015]
The conductive sheet of the present invention adopts a configuration in which the color of the conductive part and the color of the adhesive part are different. According to this configuration, when the conductive sheet is stuck, the connection portion can be easily and accurately adjusted to the target conductor portion.
[0016]
The seal according to the present invention includes a plurality of the conductive sheets adhered in groups, and the plurality of conductive sheets are grouped in groups of flexible sheet size, line section shape, or connection section shape. A configuration is adopted in which any one of them is formed differently. According to this configuration, since it is possible to select and use a conductive sheet that is optimal for the positional relationship according to the positional relationship of the connection target, the connection target can be accurately and easily connected.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0018]
(Embodiment 1)
FIG. 1 shows a conductive sheet according to Embodiment 1 of the present invention. The conductive sheet 10 has a rectangular shape, and a conductive portion 12 is formed on one surface of an insulating and flexible sheet 11 (hereinafter referred to as a flexible sheet 11). The conductive portion 12 includes a line portion 12A and connection portions 12B formed at both ends of the line portion 12A so as to be wider than the line portion 12A.
[0019]
In addition, an insulating adhesive portion 13 is formed on a portion of the flexible sheet 11 where the conductive portion 12 is not formed in the same surface as the conductive portion 12 is formed. In the case of this embodiment, a gap 14 with a predetermined interval is provided between the conductive portion 12 and the bonding portion 13. Thereby, in the conductive sheet 10, it is possible to prevent the adhesive of the adhesive portion 13 from entering the conductive portion 12 through the gap 14.
[0020]
Here, as shown in FIG. 2 showing the AA ′ cross section of FIG. 1, the conductive portion 12 is formed to be slightly thicker than the adhesive portion 13. Thereby, in the conductive sheet 10, the connecting portion 12 </ b> B of the conductive portion 12 is pressed against the connection target by the bending force of the flexible sheet 11 in a state where the bonding portion 13 is bonded to the bonding surface. The reliability of the electrical connection with the part 12B can be improved.
[0021]
However, if the conductive portion 12 is made too thicker than the adhesive portion 13, the adhesive force around the conductive portion 12 is reduced or a gap is formed around the conductive portion 12, so in this embodiment, the connection When the thickness of the portion 12B is 13 [μm], the thickness of the bonding portion 13 is selected to be about 12 [μm]. Thus, by forming the thickness of the conductive portion 12 slightly thicker than that of the bonding portion 13, it is possible to improve the reliability of electrical connection between the connection target and the connection portion 12B as described above. In addition, since it is possible to suppress the formation of a gap around the conductive portion 12, for example, oxidation of the conductive portion 12 can be suppressed.
[0022]
The material of the flexible sheet 11 is not particularly limited as long as it has flexibility and insulation and has a certain level of strength. For example, a synthetic resin film such as polyethylene can be used. The material of the conductive portion 12 is not particularly limited as long as it is conductive and flexible. For example, a conductive resin mainly composed of polyanine or the like, a conductive ink, metal particles, or the like can be used. . The material of the bonding portion 13 is not particularly limited as long as it has adhesive force and has insulating properties. For example, a resin-based pressure sensitive adhesive can be used.
[0023]
The conductive sheet 10 can be easily created by screen printing, for example. That is, first, the conductive portion 12 is formed on one surface of the flexible sheet 11 by printing using a conductive ink, and then the adhesive layer is printed at a position excluding the conductive portion 12 and with a gap 14 at a predetermined interval. What is necessary is just to form the adhesion part 13 by.
[0024]
In the conductive sheet 10 of this embodiment, the colors of the conductive portion 12 and the adhesive portion 13 are changed to such an extent that these portions can be visually identified. Thereby, when sticking the conduction | electrical_connection sheet 10, the connection part 12B of the electroconductive part 12 can be match | combined easily and correctly to the target connection object.
[0025]
3 and 4 show usage examples of the conductive sheet 10. FIG. 3 is a diagram in which the conductive sheet 10 is used for connection between terminals 21 and 22 provided on the circuit board 20. As shown in FIG. 3, if the conductive sheet 10 is used, the terminals 21 and 22 provided on the circuit board 20 can be satisfactorily connected. In FIG. 3, the conductive sheet 10 is used when connecting the terminals 21 and 22, but not only when connecting the terminals, but when connecting between wiring patterns in which disconnection or connection failure occurs, for example. Needless to say, it can also be used.
[0026]
FIG. 4 is a diagram in which the conductive sheet 10 is used to prevent static electricity charged on the metal casing of the mobile terminal. The liquid crystal panel 30 is configured such that an LCD 32, a light guide 33, a circuit board 34, and the like are built in a metal casing 31. The metal casing 31 is generally configured by combining a plurality of casing frames. In FIG. 4, the upper casing 31A and the lower casing 31B are combined. Here, if static electricity is charged in the casings 31A and 31B, it may cause dust to adhere or cause malfunction of the internal circuit.
[0027]
Therefore, if the upper casing 31A and the lower casing 31B are connected by the conductive sheet 10, even if one casing is charged, the static electricity can be released to the other casing. At this time, there is a step 35 between the assembled casings 31A and 31B. However, since the conductive sheet 10 of this embodiment has the above-described characteristics, it does not peel from the casing 31 and is sufficient. It is attached to the line section housing 31 with an adhesive force.
[0028]
Thus, according to the above configuration, the flexible sheet 11 is provided with the conductive portion 12 including the line portion 12A and the connecting portion 12B formed wider than the line portion 12, and the adhesive portion 13 at a position excluding the conductive portion 12. By forming, the conductive sheet 10 that can sufficiently secure the reliability of connection can be realized.
[0029]
In this embodiment, as shown in FIG. 1, the case where the connecting portion 12B of the conductive portion 12 is formed in a square shape has been described. However, the present invention is not limited to this, and the conductive sheet 50 shown in FIG. In addition, a U-shaped connecting portion 51B that is wider than the line portion 51A may be formed at both ends of the line portion 51A. In FIGS. 1 and 5, the line portions 12A and 51A are linear. However, the shape is not limited to this, and for example, an L-shaped pattern may be used, and various shapes can be applied.
[0030]
Further, in this embodiment, the case where the connection part wider than the line part is formed at both ends of the line part has been described, but the present invention is not limited to this, and only one of the connection parts may be wider than the line part. Good. In this way, when one of the connection objects is small and the other is large, the same effect as that of the above-described embodiment can be obtained by bringing the wider connection part into contact with the smaller connection object. Can be obtained. Furthermore, it is not always necessary to form the connection portions at both ends of the line portion. For example, three or more connection portions may be formed on the line portion.
[0031]
In this embodiment, the case where the conductive portion 12 is configured by the line portion 12A and the connection portion 12B formed wider than the line portion 12A has been described. However, the pattern of the conductive portion 12 is not limited thereto. That is, one feature of this embodiment is that the step between the conductive portion 12 and the adhesive portion 13 is reduced by providing the adhesive portion 13 at a position other than the conductive portion 12. As compared with the case where the adhesive portion 13 has a laminated structure, it is possible to obtain a larger adhesive force and to improve the connection reliability.
[0032]
(Embodiment 2)
A conductive sheet 40 according to Embodiment 2 of the present invention is shown in FIG. The conductive sheet 40 has the same configuration as the conductive sheet 10 of FIG. 1 except that a covering layer 41 that covers the line portion 12A of the conductive portion 12 is provided. The covering layer 41 is formed of a flexible insulating material. The covering layer 41 is not particularly limited as long as it is a flexible insulating material. For example, the same material as that of the flexible sheet 11 or the same material as that of the adhesive portion 13 can be used.
[0033]
As described above, in the conductive sheet 40 of this embodiment, when the covering layer 41 covering the line portion 12A of the conductive portion 12 is provided, there is another conductor or an electric circuit between conductors intended for connection. However, it is possible to prevent the line portion 12A from erroneously contacting other conductors or electrical circuits other than the connection purpose. Further, disconnection of the line portion 12A due to wear can be prevented.
[0034]
For example, when the conductive sheet 40 is used for the purpose of connecting between the terminals 21 and 22 shown in FIG. 3, even if another wiring pattern is formed on the circuit board 20 between the terminals 21 and 22, Since the contact between the wiring pattern and the line portion 12A is avoided by the covering layer 41, erroneous connection is prevented and only the intended connection target (terminals 21 and 22) can be satisfactorily connected.
[0035]
Further, considering the case where the conductive sheet 40 is applied to a connection object having a step or a corner as shown in FIG. 4, the covering layer 41 does not directly contact the line portion 12 </ b> A with the step or the corner, and the covering layer 41 protects the conductive sheet 40. Thus, disconnection of the line portion 12A is prevented.
[0036]
(Embodiment 3)
In this embodiment, a seal is proposed so that the conductive sheet having the characteristics described in the above-described embodiments can be used more suitably.
[0037]
As shown in FIG. 7, the seal 60 of this embodiment is divided into a plurality of groups, and each group has a conductive sheet with a different size of the flexible sheet, the shape of the track portion, or the shape of the connection portion. Is provided.
[0038]
In practice, the seal 60 first forms conductive portions having different patterns for each group by printing using conductive ink on one side of a flexible sheet having the same size as the seal 60, and then the conductive portions are formed. An adhesive part is formed by printing an adhesive layer on the removed position. Subsequently, a release sheet having the same size as the seal 60 is pasted on the surface on which the conductive portion and the adhesive portion are formed. Next, the flexible sheet 11 is die-cut as shown by the solid line in FIG.
[0039]
Thereby, if the seal | sticker 60 is used, according to the positional relationship etc. of a connection object, it will become possible to select and use the conduction | electrical_connection sheet optimal for the positional relationship. For example, if a conductive sheet having a short overall length is used as in group 1 when the target position is close, and a conductive sheet having a long full length is used as in group 2 if the target position is far away, the connection target can be accurately connected. become able to.
[0040]
According to the above configuration, since the seal 60 made of a plurality of types of conductive sheets grouped according to the wiring pattern and size of the conductive portion is formed, the connection target can be accurately and easily connected.
[0041]
【The invention's effect】
As described above, according to the present invention, it is possible to realize a conductive sheet that can sufficiently ensure connection reliability.
[Brief description of the drawings]
FIG. 1 is a plan view showing a configuration of a conductive sheet according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view taken along line AA ′ of the conductive sheet of FIG. FIG. 4 is a cross-sectional view when the conductive sheet of the first embodiment is used for static electricity removal of the liquid crystal panel. FIG. 5 is a modification of the first embodiment (the shape of the connecting portion). FIG. 6 is a plan view showing a configuration of a conductive sheet according to a second embodiment. FIG. 7 is a plan view showing a configuration of a seal according to a third embodiment. FIG. Sectional view showing the structure of the circuit connection sheet
10, 40, 50 Conductive sheet 11 Flexible sheet 12, 51 Conductive part 12A, 51A Line part 12B, 51B Connection part 13 Adhesive part 14 Gap 20 Circuit board 21, 22 Terminal 30 Liquid crystal panel 31 Metal casing 31A Upper casing 31B Lower housing 32 LCD
33 Light guide 34 Circuit board 35 Step 41 Cover layer 60 Seal

Claims (8)

A conductive sheet that is bonded to an electronic device and is configured to take conduction between metals located on different planes of the electronic device by a conductive portion,
A flexible sheet of insulating material;
The first and second connection portions arranged at positions facing the plane portion of the electronic device, and the first and second connection portions and the line width of the first and second connection portions are connected. A line portion that is formed narrower than the width and is disposed at a position facing the corner or step portion of the electronic device, and a flexible conductive portion formed on the sheet,
An adhesive part formed at a position excluding the conductive part on the same surface as the conductive part of the sheet ,
The adhesion area at the periphery of the line portion of the adhesion portion is made larger than the adhesion area at the periphery of the connection portion, and the adhesion force at the periphery of the line portion is higher than the adhesion force at the periphery of the connection portion. Characteristic conductive sheet. A conductive sheet that is bonded to an electronic device and is configured to take conduction between metals located on different planes of the electronic device by a conductive portion,
A flexible sheet made of an insulating material having a rectangular outer shape;
The first and second connection portions formed apart from each other and the first and second connection portions are connected and the line width is narrower than the width of the first and second connection portions. And a flexible conductive portion formed on the sheet,
An adhesive part formed at a position excluding the conductive part on the same surface as the conductive part of the sheet,
The adhesion area at the periphery of the line portion is made larger than the adhesion area at the periphery of the connection portion, and the adhesion force at the periphery of the line portion is higher than the adhesion force at the periphery of the connection portion. Sheet.   The conductive sheet according to claim 1, wherein a gap having a predetermined interval is provided between the conductive portion and the adhesive portion.   The conductive sheet according to claim 1, wherein a surface of the line portion of the conductive portion is covered with an insulating material.   The conductive sheet according to claim 1, wherein the connection part of the conductive part is formed to be slightly thicker than the adhesive part.   The conductive sheet according to any one of claims 1 to 5, wherein a color of the conductive portion and a color of the adhesive portion are different from each other.   A plurality of the conductive sheets according to claim 1 or 2 are attached in a group unit, and the plurality of conductive sheets are grouped in groups, the size of the flexible sheet, the shape of the line portion, Alternatively, the seal is formed so that any one of the shapes of the connecting portions is different. The outer shape is rectangular, the flexible sheet made of an insulating material, the first and second connection portions formed separately from each other, and the first and second connection portions are connected, and the line width is A flexible conductive part formed on the sheet having a line part formed narrower than a width of the first and second connection parts, and the conductive on the same surface as the conductive part of the sheet An adhesive portion formed at a position excluding the portion, and an adhesive area at the periphery of the line portion is made larger than an adhesive area at the periphery of the connection portion, and the adhesive force at the periphery of the line portion is connected. It is a conduction method of an electronic device using a conduction sheet that is higher than the adhesive strength at the periphery of the part,
A connection method for an electronic device, wherein the connection portion is disposed at a position facing a flat portion of the electronic device and the line portion is disposed at a position facing a corner portion or a step portion of the electronic device. .

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