JP5736418B2 - Soft electrical conductor - Google Patents

Description

  In an electronic device such as a smartphone, a mobile phone, a personal computer, a display, etc., when there is a gap between two conductors, the electromagnetic wave shield is formed by sandwiching the gap between the two conductors in a compressed state and conducting between the two conductors. It is related with the soft type electrically conductive body which comprises.

This type of soft electrical conductor is required to be thin in order to meet the demand for downsizing and thinning of electronic devices typified by recent smartphones.
As this soft electrical conductor, there is one described in Japanese Patent No. 5025709. This soft electrical conductor includes: “a rectangular parallelepiped cushion material in which two conductors are in contact with each other and formed with parallel surfaces, and the two surfaces are compressed so as to approach each other, A soft electrical conductor that electrically conducts a conductor in contact with two surfaces, a double-sided pressure-sensitive adhesive tape attached to each of the two surfaces, the entire surface of one of the two surfaces, and a side surface that connects the two surfaces So that the double-sided adhesive tape is exposed without covering the other side of the two surfaces different from the one of the two surfaces. A soft electrical conductor comprising: a conductive film attached so as to continuously cover only the one side surface of the other surface from the one side surface. It has become.
Japanese Patent No. 5025709

However, the soft electrical conductor disclosed in Patent Document 1 has the following problems.
That is, it is necessary to affix a double-sided adhesive tape on two parallel surfaces. For this reason, the thickness dimension of the soft electrical conductor is increased by the thickness dimension of the two double-sided pressure-sensitive adhesive tapes. In particular, double-sided adhesive tape has the property that it cannot be compressed much even if pressure is applied in the thickness direction, so the thickness dimension of double-sided adhesive tape accounts for the thickness dimension of this type of soft electrical conductor. Has become a big thing.
This is a major hindrance to meet the above-mentioned demand for thinning.

In addition, a double-sided pressure-sensitive adhesive sheet for winding a conductive sheet around a conductive sheet around this conductive sheet using a double-sided pressure-sensitive adhesive tape on a cushioning material, and affixing the soft-type electrical conductor to a conductor on the conductive sheet Some are equipped with.
In this soft electrical conductor, it is necessary to use a double-sided pressure-sensitive adhesive sheet for attaching the soft electrical conductor to a conductor having expensive conductivity.

On the other hand, there is a type of soft electrical conductor that does not use a double-sided adhesive tape. In the type that does not use the double-sided adhesive tape, a conductive tape is attached to the core material by a so-called hot melt adhesive using a thermoreversible plastic.
In this soft electrical conductor using hot melt, a conductive tape of a type using a double-sided adhesive tape is used to heat up to about 300 ° C. in an electric heating furnace after winding the conductive tape around the core material. Compared to the above, equipment such as an electric furnace is required and the number of man-hours is increased, resulting in high costs.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a soft electrical conductor that can be further reduced in thickness and cost can be reduced.

The soft electrical conductor according to the present invention is sandwiched between a first conductor and a second conductor to electrically connect the two conductors, and an elastic core material, A conductive sheet having conductivity covering the outer peripheral surface of the core material and an adhesive sheet for adhering the soft electrical conductor to a conductor are provided, and the conductive sheet is preliminarily coated with an adhesive. a first surface of the core material, and a second surface opposite to the first face covers a third surface connecting the first and second surfaces, the first The first surface corresponding to the conductor of the first part is covered with a conductive sheet only, the part not covered with the conductive sheet is covered with an adhesive sheet, and the second surface corresponding to the second conductor is only a part. Is covered with a conductive sheet, and a portion not covered with the conductive sheet is covered with an adhesive sheet.

In the soft electrical conductor according to the present invention, since the adhesive is preliminarily applied to the conductive sheet, it is not necessary to use a double-sided adhesive tape to attach the conductive sheet to the core as in the prior art. For this reason, the soft electrical conductor can be thinned as a whole by the thickness of the double-sided adhesive tape.
In addition, this soft electrical conductor eliminates the need for a heating process that is essential for the type using a hot melt, thereby eliminating the need for an electric heating furnace or the like for the heating process and reducing the man-hours for that. The manufacturing cost can be reduced as a whole.
Furthermore, the soft electrical conductor according to the present invention has a pressure sensitive adhesive sheet set on a portion of the first surface and the second surface that is not covered with the conductive sheet. The first conductor and the second conductor corresponding to the second surface can be attached.

1 is a schematic perspective view of a soft electrical conductor according to a first embodiment of the present invention. It is a schematic explanatory drawing which shows the state which attached the soft type electrically conductive body which concerns on the 1st Embodiment of this invention to the 2nd conductor. It is a schematic explanatory drawing which shows the state compressed by pinching | interposing the soft electrical conductor which concerns on the 1st Embodiment of this invention between the 1st conductor and the 2nd conductor. It is a schematic explanatory drawing of the soft electrical conductor which concerns on the 2nd Embodiment of this invention. It is a schematic explanatory drawing which shows the state which attached the soft type electrically conductive body which concerns on the 2nd Embodiment of this invention to the 2nd conductor. It is a schematic explanatory drawing which shows the state compressed by pinching | interposing the soft electrical conductor which concerns on the 2nd Embodiment of this invention between the 1st conductor and the 2nd conductor. It is a schematic explanatory drawing of the soft electrical conductor which concerns on the 3rd Embodiment of this invention. It is a schematic explanatory drawing of the soft electrical conductor which concerns on the 4th Embodiment of this invention. It is a schematic explanatory drawing of this kind of conventional soft electric conductor.

  The soft electrical conductor 100 according to the first embodiment of the present invention is sandwiched between a first conductor 510 and a second conductor 520, and electrically conducts between the two conductors 510 and 520. The core member 110 having a rectangular shape in cross section having elasticity, the conductive sheet 120 having conductivity covering the outer peripheral surface of the core member 110, and the soft electrical conductor 100 are connected to the second conductor. An adhesive sheet 130 to be attached to 520, a first surface 111 of the core member 110, a second surface 112 opposite to the first surface 111, the first surface 111 and the first surface 111. The second surface 112 corresponding to the second conductor 520 is partially covered with the conductive sheet 120, so that the second surface 112 corresponding to the second conductor 520 is covered with the conductive sheet 120. The part not covered with the sheet 120 is an adhesive sheet 130. Are we.

  For convenience of drawing, the dimensions and ratios of each part are not accurately described.

  The soft electrical conductor 100 is set, for example, to a width dimension of 4 mm, a length dimension of 3 mm, and a thickness dimension of 0.3 mm.

  For the core material 110, for example, urethane foam is used. The core material 110 determines the overall form of the soft electrical conductor 100. For example, PORON (registered trademark) of Roger Sinoac Co., Ltd. is used for the core material 110.

  The conductive sheet 120 is obtained, for example, by applying conductive metal plating to the surface of a cloth base material, and an adhesive is applied to the back surface of the base material. The thickness dimension of the conductive sheet 120 is 35 μm.

  On the other hand, as the pressure-sensitive adhesive sheet 130 for attaching the soft electrical conductor 100 to the second conductor 520, one having no conductivity is used. The thickness dimension of the sticking sheet 130 is desirably the same as that of the conductive sheet 120, but may be thinner than the conductive sheet 120. However, the sticking sheet 130 should not be thicker than the conductive sheet 120.

The soft electrical conductor 100 includes a first surface 111 of the core member 110, a second surface 112 facing the first surface 111, and a space between the first surface 111 and the second surface 112. Only one surface of the four third surfaces 113 to be connected is covered with the conductive sheet 120.
In addition, since the core 110 is a rectangular parallelepiped, the third surface 113 has the front surface, the back surface, the right side surface, and the left side surface, but only one of them (the left side surface corresponds to the drawing) is the conductive sheet. It is covered with 120.

The first surface 111 of the core material 110 is entirely covered with the conductive sheet 120.
On the other hand, the second surface 112 of the core member 110 is not entirely covered with the conductive sheet 120, but only a part thereof is covered with the conductive sheet 120.
A portion of the second surface 112 that is not covered with the conductive sheet 120 is a portion that is connected to the third surface 113 that is not covered with the conductive sheet 130.

  A portion of the second surface 112 that is not covered with the conductive sheet 120 is covered with the adhesive sheet 130.

  As shown in FIG. 2, the soft electrical conductor 100 configured as described above is attached to the second conductor 520 with the adhesive sheet 130 on the second surface 112. In this state, the second conductor 520 is reliably in contact with the conductive sheet 120.

  The first conductor 510 is brought into contact with the soft electrical conductor 100 in this state. The first conductor 510 is brought into contact with the soft electrical conductor 100 from the first surface 111 side. That is, the soft electrical conductor 100 is sandwiched between the first conductor 510 and the second conductor 520.

The soft electrical conductor 100 is usually 0.3 mm, but is compressed to 0.1 mm by being sandwiched between the first conductor 510 and the second conductor 520 as shown in FIG.
Since the conductive sheet 120 is in contact with both the conductors 510 and 520, the first conductor 510 and the second conductor 520 are secured.

  Since the soft electrical conductor 100 is configured so that only one surface of the third surface 113 of the core member 110 is covered with the conductive sheet 120, the amount of the conductive sheet 120 used is reduced accordingly. ing.

In addition, since the conductive sheet 120 in the soft electrical conductor 100 is preliminarily coated with an adhesive, the conductive sheet is not only on the first surface 111 and the second surface 112 but also on the third surface 113. 120 is affixed to the core 110.
For this reason, even when sandwiched between the first conductor 510 and the second conductor 520 and compressed, only the conductive sheet 120 covering the third surface 113 is released from the third surface 113 of the core member 110. There is no. If the conductive sheet 120 is separated from the core material 110, it may come into contact with other adjacent electronic components, so that the surface corresponding to the third surface 113 is not attached to the core material 110. In the soft electrical conductor (for example, one described in Patent Document 1), it is necessary to increase the gap between adjacent electronic components.
On the other hand, in the soft electrical conductor 100 in which the conductive sheet 120 is not separated on the third surface 113 even when compressed, the gap between adjacent electronic components can be reduced. That is, the soft electrical conductor 100 can greatly contribute to the downsizing and thinning of electronic equipment.

Next, a soft electrical conductor 200 according to a second embodiment of the present invention will be described with reference to FIGS.
The soft electrical conductor 200 is different from the above-described soft electrical conductor 100 in that only one of the third surfaces 113 is covered with the conductive sheet 120 in the soft electrical conductor 100, whereas the soft electrical conductor 100 is soft. The electrically conductive body 200 is that the two opposite surfaces of the third surface 213 are covered with the conductive sheet 220.
Further, in the soft electrical conductor 200, a portion of the second surface 212 that is not covered with the conductive sheet 220 is not connected to the third surface 213 that is covered with the conductive sheet 220. Is also different.

In this soft electrical conductor 200, the conductive sheet 220 covers the first surface 211, a part of the second surface 212 of the core member 210, and the two opposite third surfaces 213.
A portion of the second surface 212 that is not covered with the conductive sheet 120 is covered with the adhesive sheet 230.

  Further, in the case of the soft electrical conductor 200, even when a compressive force by the first conductor 510 is applied to the first surface 211 from an oblique direction, the first conductor 510 and the second conductor 520 Conductivity can be ensured.

That is, as shown in FIG. 9, the entire surface of the first surface 911 of the core member 910, the two opposite third surfaces 913, and the second surface 912 is covered with the conductive sheet 920, and the second surface 912 In the conventional soft electrical conductor 900 of the type in which the adhesive sheet 930 is disposed at substantially the center, when a compressive force is applied to the first surface 911 from an oblique direction, the first conductor (not shown in FIG. 9). There is a risk that conduction between the first conductor 520 and the second conductor 520 cannot be ensured.
When a compressive force is applied to the first surface 911 of the conventional soft electrical conductor 900 from an oblique direction, the portion of the second surface 912 that does not have the adhesive sheet 930 is warped, and the second conductor 520 is warped. It will stop touching.
This is because the adhesive sheet 930 is disposed on the conductive sheet 920 on the second surface 912. In order to prevent non-conduction in such a state, in this type of soft electrical conductor 900, the adhesive sheet 930 must be conductive.

  However, in the soft electrical conductors 100 and 200, even if the adhesive sheets 130 and 230 do not use conductive materials, the portions of the second surfaces 112 and 212 that are not covered with the conductive sheets 120 and 220 are used. Is covered with the adhesive sheets 130 and 230, the conductive sheets 120 and 220 are reliably in contact with the second conductor 520 regardless of the compression force applied from any direction. In other words, the conduction between the first conductor 510 and the second conductor 520 can be ensured regardless of the direction in which the compressive force is applied.

In addition, as shown in FIGS. 7 and 8, the soft electrical conductors 300 and 400 according to other embodiments of the present invention include not only the second surfaces 312 and 412 of the core materials 310 and 410, but also the first Some of the surfaces 311 and 411 are also provided with portions not covered with the conductive sheets 320 and 420, and the portions are covered with the adhesive sheets 330 and 430.
With such soft electrical conductors 300 and 400, not only the second conductor 520 but also the first conductor 510 is attached.

DESCRIPTION OF SYMBOLS 100 Soft electrical conductor 110 Core material 111 1st surface 112 2nd surface 113 3rd surface 120 Conductive sheet 130 Adhesive sheet 510 1st conductor 520 2nd conductor

Claims (5)

In a soft electrical conductor that is sandwiched between a first conductor and a second conductor and electrically conducts between the two conductors, an elastic core material and a conductive material that covers the outer peripheral surface of the core material A conductive sheet and a sticking sheet for sticking the soft electrical conductor to a conductor, the conductive sheet is coated with an adhesive in advance, and the first of the core material , A second surface facing the first surface, and a third surface connecting the first surface and the second surface, the first surface corresponding to the first conductor A part of the surface is covered with a conductive sheet, a part not covered with the conductive sheet is covered with an adhesive sheet, and a part of the second surface corresponding to the second conductor is covered with a conductive sheet. A soft electrical conductor characterized in that a portion not covered with a conductive sheet is covered with an adhesive sheet.   The soft electrical conductor according to claim 1, wherein the core member has a rectangular shape in a cross-sectional view, and only one surface of the third surface is covered with a conductive sheet.   3. The soft electrical continuity according to claim 2, wherein the portion of the second surface that is not covered with the conductive sheet is a portion that is connected to the third surface that is not covered with the conductive sheet. body.   2. The soft electrical conductor according to claim 1, wherein the core member has a substantially rectangular shape in cross-section, and two opposing surfaces of the third surface are covered with a conductive sheet. The soft electrical conductor according to claim 1, wherein a portion of the second surface that is not covered with the conductive sheet is not connected to a third surface that is covered with the conductive sheet. .

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