JP5561014B2 - Anisotropic conductive sheet and method for manufacturing the same, method for connecting electronic member, and electronic component - Google Patents

Description

  The present invention relates to an anisotropic conductive sheet and a method for manufacturing the same, a method for connecting an electronic member, and an electronic component. More specifically, an anisotropic conductive sheet preferably used as an electrical connection between circuit elements and a connector in a printed circuit board inspection apparatus, a method for manufacturing the same, and a method for connecting an electronic member for electrically connecting two electronic members And an electronic component in which two electronic members are electrically connected.

  An anisotropic conductive sheet exhibits conductivity only in the thickness direction, or exhibits conductivity only in the thickness direction when pressed in the thickness direction. An anisotropic conductive sheet can be compactly connected without using means such as soldering or mechanical fitting, and has a soft connection by absorbing mechanical shocks and strains. Features such as being possible. For this reason, in the fields of electronic computers, electronic digital watches, electronic cameras, mobile phones, etc., the two electronic members are electrically connected by interposing an anisotropic conductive sheet between the two electronic members. Is widely practiced.

  Conventionally, anisotropic conductive sheets having various configurations are known. For example, (1) a dispersion-type anisotropic conductive sheet obtained by uniformly dispersing conductive particles in a polymer material; (2) a plurality of conductive portions extending in the thickness direction and insulating portions that insulate them from each other; There is an unevenly distributed anisotropic conductive sheet. Since the unevenly distributed anisotropic conductive sheet has a conductive portion according to the electrode pattern of the electronic member to be connected and the pattern of the palm, it is excellent in connection reliability as compared with the distributed anisotropic conductive sheet.

  The unevenly distributed anisotropic conductive sheet is an anisotropic conductive sheet having a plurality of conductive portions, and in at least one conductive portion, the area of the conductive portion on one surface of the sheet and the conductive portion on the other surface. An anisotropic conductive sheet (Patent Document 1) in which the ratio to the area is set within a specific range, a first base film having a plurality of first conductive portions, and a second base having a plurality of second conductive portions An anisotropic conductive sheet (Patent Document 2) obtained by laminating a film with a first conductive portion and a second conductive portion in contact with each other is disclosed.

  By the way, when a minute electronic member included in a mobile phone or the like is connected using an anisotropic conductive sheet, it absorbs unevenness on the surface of the electronic member to be connected (hereinafter also referred to as “unevenness absorbing ability”). Is a problem. The unevenness absorbability depends on the thickness of the anisotropic conductive sheet. For example, the higher the thickness of the anisotropic conductive sheet, the higher the uneven absorbability. However, it is difficult to ensure insulation performance between adjacent conductive parts (hereinafter also referred to as “insulation resolution”) with a thick unevenly distributed anisotropic conductive sheet, and as a result, high connection reliability between electronic members. Cannot be obtained (see paragraphs [0008] to [0009] of Patent Document 3).

  The present applicant discloses an anisotropic conductive sheet having a front side anisotropic conductive elastomer layer, a middle anisotropic conductive elastomer layer, and a back side anisotropic conductive elastomer layer as one solution to the above problem. (Patent Document 3). According to the sheet, (1) since the thickness of the entire sheet is large, a high uneven absorption capacity is obtained. (2) Since the thickness of each elastomer layer can be reduced, the insulation performance between adjacent conductive portions in each elastomer layer is improved. Therefore, insulation performance between adjacent electrodes in the electronic member to be connected is ensured.

  Moreover, the above-mentioned patent documents 1 and 2 also disclose anisotropic conductive sheets having a multilayer structure. For example, in Patent Document 2, by using the anisotropic conductive sheet, the electrode pattern can be miniaturized corresponding to the narrow pitch, and the conduction performance in the thickness direction and the insulation performance in the plane direction are combined. It can be realized.

Japanese Patent Laid-Open No. 11-204176 JP 2008-234996 A JP 2010-009911 A

  In recent years, with the miniaturization of electronic components, it is necessary to reduce the pitch of electrode patterns of electronic members and to make electrodes finer. In connection with this, when laminating an unevenly distributed anisotropic conductive sheet, it is required to easily and precisely align the sheets. Although the above-mentioned patent document mentions the above requirements, further improvements are desired with the recent miniaturization of electronic components. An object of the present invention is to provide a laminated anisotropically conductive sheet that is excellent in uneven absorbability and insulation resolution and that is easily and precisely aligned between sheets.

  The present inventors have intensively studied to solve the above problems. As a result, the inventors have found that the above problems can be solved by an anisotropic conductive sheet having the following configuration, and have completed the present invention. That is, the present invention relates to the following [1] to [8], for example.

  [1] A conductive forming portion having two or more anisotropic conductive layers, each of the anisotropic conductive layers being formed in stripes at predetermined intervals in conductor regions extending in the thickness direction of the sheet member; The anisotropic conductive layer is a sheet member composed of insulating portions that insulate the conductive regions from each other, and each anisotropic conductive layer is directly opposite to the conductive region of one anisotropic conductive layer and the other anisotropic conductive layer. An anisotropic conductive sheet, wherein the conductive region is arranged so as to intersect with the upper surface of the sheet when projected from above.

  [2] It has three or more anisotropic conductive layers, and each anisotropic conductive layer is arranged so that the intersecting portions of the conductor regions viewed from the upper surface of the sheet are substantially at the same position. The anisotropic conductive sheet according to [1], wherein

  [3] The anisotropic conductive sheet according to [1] or [2], wherein the thickness of each anisotropic conductive layer is 1 mm or less.

  [4] (1) A sheet member composed of a conductive formation portion in which conductor regions extending in the thickness direction of the sheet member are formed in stripes at predetermined intervals, and an insulating portion that insulates the conductor regions from each other. A step of preparing a plurality of sheets, and (2) the sheet member and the conductive region of one sheet member directly facing each other so that the conductive region of the other sheet member intersects when viewed from the upper surface of the sheet. A method for producing an anisotropic conductive sheet comprising a step of laminating.

  [5] In the above [4], in the step (2), the sheet member is sequentially laminated so that the intersecting portions of the conductor regions viewed from the upper surface of the sheet are substantially at the same position. The manufacturing method of the anisotropically conductive sheet of description.

  [6] The method for producing an anisotropic conductive sheet according to [4] or [5], wherein the thickness of each sheet member is 1 mm or less.

  [7] By interposing the anisotropic conductive sheet according to any one of [1] to [3] between the first electronic member and the second electronic member, An electronic member connecting method, wherein the electronic member is electrically connected.

  [8] A first electronic member, the anisotropic conductive sheet according to any one of [1] to [3] disposed on the first electronic member, and the first of the sheet. An electronic component comprising: a second electronic member disposed on a side opposite to the side on which the electronic member is disposed and electrically connected to the first electronic member via the sheet.

  According to the present invention, it is excellent in uneven absorption capacity and insulation resolution as well as easy and precise alignment between sheets in response to the recent reduction in the pitch of electrode patterns of electronic components due to miniaturization of electronic components and the miniaturization of electrodes. It is possible to provide a laminated anisotropic conductive sheet formed in (1).

Fig.1 (a) is a perspective view for description of the anisotropic conductive sheet of the present invention. FIG. 1B is a cross-sectional view for explaining the sheet on the AA ′ plane of FIG. 1 (c) and 1 (d) are top views for explaining the sheet members constituting the anisotropic conductive sheet of the present invention. FIGS. 2A1 and 2A2 are an explanatory perspective view and a top view showing an example of a laminated state of anisotropic conductive layers. FIGS. 2B1 and 2B2 are an explanatory perspective view and a top view showing another example of a laminated state of anisotropic conductive layers. FIG. 3 is a sectional view for explaining the electronic component of the present invention. FIG. 4 is an explanatory perspective view of the sheet member. FIG. 5 is an example showing a manufacturing process of the sheet member. FIG. 6 is an example showing a process of laminating the sheet members.

  Hereinafter, an anisotropic conductive sheet and a method for manufacturing the same, a method for connecting an electronic member, and an embodiment of an electronic component of the present invention will be described in detail. In the following, the drawings are referred to as appropriate, but the present invention is not limited to the drawings.

[Anisotropic conductive sheet]
The anisotropic conductive sheet 10 of the present invention has, for example, two or more anisotropic conductive layers 20 as shown in FIGS. 1A and 1B, and each anisotropic conductive layer 20 is a sheet member 30. Consists of. As shown in FIGS. 1C and 1D, the sheet member 30 includes a conductor forming portion 32 in which conductor regions 31 extending in the thickness direction of the sheet member 30 are formed in stripes at predetermined intervals, and a conductor. It comprises an insulating portion 33 that insulates the regions 31 from each other.

  The present invention is characterized by the arrangement state (lamination state) of each anisotropic conductive layer 20. That is, each anisotropic conductive layer 20 includes a conductive region 31 of one anisotropic conductive layer 20 and a conductive region 31 of the other anisotropic conductive layer 20 that are directly opposed to each other as viewed from the upper surface of the sheet. The crossing is preferably performed so as to intersect at an angle of preferably 45 to 90 degrees, more preferably 60 to 90 degrees, and particularly preferably substantially orthogonal. Here, the “anisotropic conductive layers directly facing each other” means an i-th layer (i is any one of 1 to n−1) in an anisotropic conductive sheet composed of n layers (n is an integer of 2 or more). Integer) and the set of the i + 1th layer. FIG. 1B is a cross-sectional view of the anisotropic conductive sheet on the AA ′ plane in FIG.

  When three or more anisotropic conductive layers 20 are present, each anisotropic conductive layer 20 is arranged such that the intersecting portions 34 of the conductor regions 31 viewed from the top of the sheet are substantially at the same position. It is preferable that Here, “the intersecting parts as projected from the top of the sheet are substantially at the same position” means that the anisotropic conductivity formed of n layers (n is an integer of 3 or more) as shown in FIG. The cross section 34 (i, i + 1) of the conductive region of the i-th layer (i is an arbitrary integer from 1 to n-2) and the conductive region of the (i + 1) -th layer viewed from the top surface of the sheet, The intersection part 34 (i + 1, i + 2) of the conductor region of the i + 1 layer and the conductor region of the (i + 2) th layer viewed from the upper surface of the sheet has an overlap as viewed from the upper surface of the sheet, and preferably indicates a match. In the case where the intersecting portions 34 of the conductor regions 31 as viewed from the upper surface of the sheet are not substantially at the same position, for example, an arrangement as shown in FIG.

  As shown in FIGS. 1A and 1B, in the anisotropic conductive sheet composed of n layers (n is an integer of 3 or more), the i-th layer (i is any one of 1 to n-2). It is preferable that the positions of the conductor region of (integer) and the conductor region of the (i + 2) th layer coincide with each other when viewed from the upper surface of the sheet.

  The anisotropic conductive sheet 10 of the present invention exhibits conductivity only in the thickness direction when pressed in the thickness direction at the intersecting portion 34. That is, since the intersecting portion 34 is composed of the conductor region 31 in the entire thickness direction of the sheet, electrical connection is possible when the intersecting portion 34 is pressurized.

  The intersection part 34 is positioned corresponding to the pattern of the electrode 41 etc. which the electronic member 40 etc. which are connection objects have. FIG. 3 shows an example in which the electrodes 41, 42 of one electronic member 40 and the electrodes 41 ′, 42 ′ of another electronic member 40 ′ are electrically connected using the anisotropic conductive sheet 10 of the present invention. Indicates. In this example, the conductor region 31 at the intersecting portion 34 of the anisotropic conductive sheet 10 is deformed by being pressed in the thickness direction by the electrodes 41, 41 ′ or the electrodes 42, 42 ′ connected to each other. Conductive paths are formed by conductive particles in the thickness direction of these conductor regions 31, and electrical connection between the electrodes 41 and 41 'and between the electrodes 42 and 42' is achieved. Further, the anisotropic conductive sheet 10 of the present invention can reduce the thickness of each anisotropic conductive layer 20 and the conductor regions 31 of the anisotropic conductive layer 20 facing each other intersect with each other. The insulation resolution between 41 and 42 'and between the electrodes 42 and 41' can be ensured.

  The layer configuration of the anisotropic conductive sheet 10 of the present invention is as described above, and the number of layers of the anisotropic conductive layer 20 may be appropriately selected according to the use / use mode of the sheet 10, and usually 2 to 2. 10 layers, preferably 2 to 3 layers. The total thickness of the anisotropic conductive sheet 10 is usually 1 to 100 mm, preferably 1 to 10 mm. Since the thickness of the whole sheet | seat can be enlarged on the structure of the anisotropic conductive sheet 10 of this invention, high uneven | corrugated absorbability can be obtained.

  Each sheet member may be directly laminated, or may be combined with an adhesive that does not inhibit conduction of the conductor region between the sheet members. As the adhesive, silicone rubber or the like can be preferably used.

  Even if the anisotropic conductive sheet 10 of the present invention has a flat surface portion and a protrusion portion made of a conductor region 31 protruding from the flat surface portion on the surface of the outermost layer sheet member 30 constituting the sheet 10. Good. The shape of the protrusion is not particularly limited. When the anisotropic conductive sheet 10 has such a protrusion, there is an advantage that the load applied to the electrodes 41 and 42 during pressurization can be reduced.

<Sheet material>
The sheet member 30 includes a conductive formation portion 32 in which conductor regions 31 extending in the thickness direction of the sheet member 30 are formed in stripes at predetermined intervals, and an insulating portion 33 that insulates the conductor regions 31 from each other. The In the present invention, the sheet surface of the sheet member 30 is defined by the X direction and the Y direction that is substantially perpendicular to the X direction, and the thickness direction of the sheet member 30 is defined by the Z direction that is substantially orthogonal to both the X direction and the Y direction. To do. In this case, as shown in FIG. 4, the conductor region 31 extends in the X direction, has a width in the Y direction, and is formed from the upper surface to the lower surface of the sheet member 30 in the Z direction. Has a configuration in which the conductor regions 31 are formed in stripes at predetermined intervals.

  The thickness of each sheet member 30 is usually 1 mm or less, preferably 0.001 to 0.1 mm. In the present invention, since the thickness of each sheet member 30 can be reduced, insulation resolution between adjacent electrodes 41 and 42 in the electronic member 40 or the like to be connected is ensured.

《Conductivity forming part》
The conductive forming portion 32 is composed of a plurality of conductive regions 31, and the conductive regions 31 are formed in stripes at predetermined intervals in the sheet member 30. The conductor region 31 is formed from the upper surface to the lower surface of the sheet member 30 and has a function of ensuring conductivity in the thickness direction of the sheet member 30 when pressed. The conductor region 31 is formed of, for example, an aggregate of conductive particles and an insulating polymer material. When the conductor region 31 is pressed and compressed in the thickness direction, the resistance value is reduced to ensure conductivity.

  The width a in the Y direction of the conductor region 31 is usually 0.02 to 1 mm, preferably 0.02 to 0.2 mm. The interval (pitch) b between adjacent conductor regions 31 is usually 0.1 to 1 mm, preferably 0.1 to 0.5 mm.

  The content ratio of the conductive particles in the conductor region 31 is usually 5 to 80%, preferably 20 to 60% in terms of volume fraction. When this ratio is too small, a sheet member having a sufficiently small electric resistance value may not be obtained. On the other hand, when this ratio is excessive, the obtained conductor region 31 may be fragile.

<Insulation part>
The insulating part 32 is formed of a polymer material so as to surround the conductor region 31 in the surface direction, and has a function of insulating the plurality of conductor regions 31 from each other and ensuring insulation in the surface direction of the sheet member 30. . The insulating portion 32 contains no or almost no conductive particles.

<Method for producing sheet member>
The manufacturing method of the sheet member which comprises the anisotropic conductive sheet of this invention is demonstrated.
The sheet member can be manufactured using a molding material containing an insulating polymer material and conductive particles. First, a molding material containing an insulating polymer material and conductive particles is prepared. Here, the defoaming process by pressure reduction can be performed with respect to a molding material as needed. In the molding material, the content ratio (volume fraction) of the conductive particles is determined in consideration of the content ratio of the conductive particles in the formed conductor region, and is usually 5 to 40%, preferably 8 to 33%, more preferably 10 to 30%.

《Insulating polymer material》
Insulating polymer materials include silicone rubber, ethylene propylene rubber, urethane rubber, fluorine rubber, polyester rubber, styrene butadiene rubber, styrene butadiene block copolymer rubber, styrene isopropylene block copolymer rubber, and soft epoxy resin. Can be mentioned.

  As the insulating polymer material, a material that is liquid or fluid at a temperature at the time of manufacturing the sheet member and is subsequently cured is preferable. When the insulating polymer material has such properties, the magnetic conductive particles can be oriented or assembled by applying a magnetic field during sheet member production, and then the insulating polymer material is cured. The conductive particles having magnetism can be fixed. For example, thermosetting silicone rubber is preferable because it is in a liquid state at normal temperature and is cured by heating to become a solid rubber. In addition, for example, soft epoxy resins, thermoplastic elastomers, thermoplastic soft resins, etc. are preferable because they have fluidity when the sheet member is produced and become solid after the sheet member is produced, even if they are solid at room temperature.

《Conductive particles》
The conductive particles are preferably magnetic conductive particles from the viewpoint that the conductive particles can be easily moved in the molding material when forming the conductor region. Examples of the conductive particles having magnetism include (1) particles of a metal having magnetism such as iron, nickel and cobalt or particles of these alloys, and (2) particles containing a metal having magnetism such as iron, nickel and cobalt. (3) Coated particles obtained by using the particles of (1) or (2) as core particles and plating the surface of the core particles with a conductive metal such as gold, silver, palladium, rhodium, etc. Coated particles obtained by using inorganic substance particles such as magnetic metal particles or glass beads or polymer particles as core particles, and plating the surface of the core particles with a conductive magnetic material such as nickel or cobalt, (5) (3) Or the covering particle | grains obtained by coat | covering both a conductive magnetic body and a conductive metal to the core particle of (4) are mentioned. Among these, coated particles obtained by using nickel particles as core particles and plating the surface with a conductive metal such as gold or silver are preferable. Examples of means for coating the surface of the core particles with the conductive metal include electroless plating.

  When using coated particles obtained by coating the surface of the core particles with conductive metal as the conductive particles, from the viewpoint of obtaining good conductivity, the coverage of the conductive metal on the surface of the core particles (core particles The ratio of the covering area of the conductive metal to the surface area) is preferably 40% or more, more preferably 45% or more, and particularly preferably 47 to 95%. Further, the coating amount of the conductive metal is preferably 2.5 to 50% by weight, more preferably 3 to 45% by weight, still more preferably 3.5 to 40% by weight, particularly preferably the core particle. 5 to 30% by weight.

  The particle diameter of the conductive particles is preferably 1 to 500 μm, more preferably 2 to 400 μm, still more preferably 5 to 300 μm, and particularly preferably 10 to 150 μm. The particle size distribution (Dw / Dn) of the conductive particles is preferably 1 to 10, more preferably 1 to 7, still more preferably 1 to 5, and particularly preferably 1 to 4.

  The shape of the conductive particles is not particularly limited, but spherical particles, star-shaped particles, or secondary particles in which these particles are aggregated are preferable in that they can be easily dispersed in the insulating polymer material.

  By using such conductive particles, the conductor region of the obtained sheet member is easily deformed under pressure, and sufficient electrical contact is obtained between the conductive particles in the conductor region.

  Next, (1) a step of filling a molding space formed by a pair of molds via a spacer with a molding material, and (2) applying a parallel magnetic field in the thickness direction of the molding space, and further curing the molding material The said sheet | seat member can be manufactured through the process to make it.

<< Process (1) >>
Step (1) is a step of filling a molding material into a molding space 130 formed by a pair of molds via a spacer 120 as shown in FIG. The pair of molds is composed of an upper mold 100 and a lower mold 110, and these molds are arranged to face each other with a spacer 120 interposed therebetween. The molding space 130 includes a conductor region formation scheduled portion 131 and an insulating portion formation scheduled portion 132.

  The upper mold 100 includes a plate-like substrate 101 made of a ferromagnetic material, and a magnetic body portion 102 and a non-magnetic body portion 103 formed on the lower surface of the plate-like substrate 101. A plurality of magnetic body portions 102 are formed according to a pattern corresponding to the pattern of the conductor region 31 to be formed, and the non-magnetic body portion 103 is formed at a place other than the magnetic body portion 102.

  The lower mold 110 includes a plate-like substrate 111 made of a ferromagnetic material, and a magnetic body portion 112 and a non-magnetic body portion 113 formed on the upper surface of the plate-like substrate 111. A plurality of magnetic body portions 112 are formed according to a pattern corresponding to the pattern of the conductor region 31 to be formed, and the non-magnetic body portion 113 is formed at a place other than the magnetic body portion 112.

  Examples of the ferromagnetic material constituting the plate-like base materials 101 and 111 and the magnetic body portions 102 and 112 in each of the upper die 100 and the lower die 110 include iron, nickel, cobalt, and alloys thereof. Examples of the material constituting the nonmagnetic parts 103 and 113 in each of the upper mold 100 and the lower mold 110 include nonmagnetic metals such as copper, and heat resistant resins such as polyimide.

<< Step (2) >>
Step (2) is a step of applying a parallel magnetic field in the thickness direction of the molding space 130 and further curing the molding material. The molding material may be cured during or after the action of the parallel magnetic field. The intensity of the parallel magnetic field is preferably 0.02 to 2 Tesla.

  For example, an electromagnet 140a of an upper flat plate and an electromagnet 140b of a lower flat plate are arranged so as to sandwich a pair of molds. In this state, the electromagnets 140a and 140b are operated, and a parallel magnetic field is applied in a direction from the magnetic body portion 102 of the upper mold 100 toward the magnetic body section 112 of the lower mold 110 corresponding thereto. In addition, as a means for applying a parallel magnetic field, a permanent magnet can be used instead of an electromagnet. Thereby, in the conductor region formation scheduled part 131, a parallel magnetic field stronger than the insulating part formation scheduled part 132 is applied in the thickness direction. Due to the parallel magnetic field having this distribution, the conductive particles in the molding material gather in the conductor region formation scheduled portion 131, and the conductive particles are localized. Then, after the parallel magnetic field is applied or after the parallel magnetic field is removed, the molding material is cured by heating or the like.

  The curing treatment of the molding material is appropriately selected depending on the type of the insulating polymer material, but is usually performed by heat treatment. The specific heating temperature and heating time are appropriately set in consideration of the type of the insulating polymer material, the time required for orientation of the conductive particles, and the like.

  As described above, the conductive region 31 extending in the thickness direction of the sheet member 30 is formed in stripes at predetermined intervals, and the insulating portion 33 that insulates the conductive region 31 from each other. The sheet member 30 to be manufactured can be manufactured.

[Method of manufacturing anisotropic conductive sheet]
The manufacturing method of the anisotropic conductive sheet of this invention is demonstrated.
The method for producing an anisotropic conductive sheet according to the present invention includes: (1) a conductive forming portion in which conductive regions extending in a thickness direction of a sheet member are formed in a striped pattern at predetermined intervals; and the conductive regions are insulated from each other. A step of preparing a plurality of sheet members each including an insulating portion, and (2) the sheet member includes a conductive region of one sheet member and a conductive region of the other sheet member directly facing each other. A step of stacking so as to intersect when viewed from the top.

<Process (1)>
In step (1), a plurality of the above-mentioned sheet members are prepared in accordance with the number of layers of the anisotropic conductive sheet. The sheet member may be a single type of sheet member, or may be a different type of sheet member (for example, a sheet member having a different thickness or material).

  For example, as shown in FIG. 6A, the width and pitch of the conductor regions in each sheet member are the same (that is, the conductor regions are aligned in the stacking direction), and the thicknesses may be different from each other. A sheet member group consisting of members is prepared.

  Alternatively, as shown in FIG. 6 (b), the width and pitch of the conductor regions in each sheet member are the same, and the A group consisting of sheet members that may have different thicknesses, and in each sheet member Prepare a group B consisting of sheet members having the same width and pitch of the conductor regions (however, different from the width and pitch of the conductor regions in the sheet members belonging to the group A) and the thicknesses of which may be different. To do.

<Process (2)>
In the step (2), preferably, the above-mentioned sheet member is substantially omitted so that the conductor region of one sheet member and the conductor region of the other sheet member that are directly opposed to each other intersect each other when viewed from the top of the sheet. Laminate so that they are orthogonal. When three or more sheet members are used, it is preferable to sequentially stack the above-described sheet members so that the intersecting portions of the conductor regions viewed from the upper surface of the sheet are substantially at the same position. Here, the meanings of “sheet members directly facing each other” and “intersection portions projected from the upper surface of the sheet are substantially at the same position” are as described in the section “Anisotropically conductive sheet”.

  For example, as shown in FIG. 6A, the sheet members belonging to the sheet member group are formed at a predetermined angle (for example, 45 to 90 degrees) such that the conductor regions of the sheet members directly facing each other intersect each other. The layers may be sequentially stacked in different postures, preferably 60 to 90 ° different postures, specifically 90 ° different postures.

  Alternatively, as shown in FIG. 6B, the sheet members belonging to each of the A group and the B group are formed at a predetermined angle (for example, 45 to 90 degrees different from each other) so that the respective conductor regions intersect each other. Then, preferably, the layers may be alternately stacked in a posture different from 60 to 90 degrees, specifically in a posture different from 90 degrees.

  When laminating the sheet members, the sheet members are combined by a method such as bonding the sheet members in the presence or absence of an adhesive that does not impede the conduction of the conductive regions between the sheet members. be able to. As the adhesive, silicone rubber or the like can be preferably used. As another method, a method of heat-sealing sheet members without using an adhesive or the like, a method of using a mounting jig or the like to be described later without using an adhesive, or the like can be given. Further, the laminated sheet members can be cut as necessary.

In the method for producing an anisotropic conductive sheet of the present invention, the sheet members can be easily laminated under the above conditions, so that the alignment between the sheet members can be precisely performed. Therefore, the anisotropic conductive sheet of the present invention can cope with the narrowing of the electrode pattern of the electronic member and the miniaturization of the electrode due to the recent miniaturization of electronic components.
As described above, the anisotropic conductive sheet of the present invention can be manufactured.

[Electronic member connection method and electronic component]
As shown in FIG. 3, the electronic member connection method of the present invention interposes the anisotropic conductive sheet 10 of the present invention between the first electronic member 40 and the second electronic member 40 ′. These electronic members are electrically connected.

  Further, as shown in FIG. 3, the electronic component of the present invention includes a first electronic member 40, an anisotropic conductive sheet 10 of the present invention disposed on the first electronic member 40, and the sheet 10. A second electronic member 40 ′ disposed on the side opposite to the side on which the first electronic member 40 is disposed and electrically connected to the first electronic member 40 via the sheet 10. Have.

  Here, the intersecting portion 34 in the anisotropic conductive sheet 10 of the present invention is pressurized by the electrodes 41, 42, etc. of the first electronic member 40 and the electrodes 41 ′, 42 ′, etc. of the second electronic member 40 ′, Thereby, a conduction path is formed, and the first electronic member 40 and the second electronic member 40 'are electrically connected.

The first electronic member 40, the anisotropic conductive sheet 10, and the second electronic member 40 ′ are fixed to each other by appropriate means such as an adhesive or a mounting jig structure as necessary. In the present invention, the mounting jig structure is a structure in which members can be fitted to each other by having a feature in the shape of the member, such as a fitting structure by a male-female structure or a hook structure.
Hereinafter, the first electronic member and the second electronic member will be described.

<First electronic member>
The first electronic member is not particularly limited, and various types can be used. For example, printed wiring boards, such as a rigid printed wiring board (PCB), a flexible printed wiring board (FPC), and a flex rigid printed wiring board, are mentioned. The printed wiring board may be a single-sided printed wiring board, a double-sided printed wiring board, or a multilayer printed wiring board. A first electronic member such as a printed wiring board has a substrate and a plurality of electrodes according to a pattern corresponding to the wiring formed on the substrate and the electrodes of the second electronic member.

  Composite materials such as glass fiber reinforced epoxy resin, glass fiber reinforced phenol resin, glass fiber reinforced polyimide resin, and glass fiber reinforced bismaleimide triazine resin; silicon dioxide, alumina And other ceramic materials. Examples of the material constituting the FPC flexible substrate include polyimide, polyamide, polyester, and polysulfone.

  Examples of the material of the wiring and the electrode included in the first electronic member include gold, silver, copper, nickel, palladium, carbon, aluminum, indium tin oxide (ITO), and the like. The pitch of the electrodes included in the first electronic member is usually 0.1 to 5 mm. The thickness of the board | substrate which a 1st electronic member has is 0.1-5 mm normally.

<Second electronic member>
The second electronic member is not particularly limited, and various types can be used. For example, in addition to the above-mentioned printed wiring board, transistors, diodes, relays, switches, IC chips or LSI chips or their packages; modules such as multichip modules (MCM); resistors, capacitors, crystal resonators, speakers, microphones, Examples include transformers (coils), passive components such as inductors, TFT type liquid crystal display panels, STN type liquid crystal display panels, plasma display panels, electroluminescence panels, and other display panels. The second electronic member such as a printed wiring board has a substrate and a plurality of electrodes according to a pattern corresponding to the wiring formed on the substrate and the electrodes of the first electronic member.

  Examples of the material of the wiring and the electrode included in the second electronic member include gold, silver, copper, nickel, palladium, carbon, aluminum, indium tin oxide (ITO), and the like. The pitch of the electrodes included in the second electronic member is usually 0.1 to 5 mm. The thickness of the board | substrate which a 2nd electronic member has is 0.1-5 mm normally.

  By incorporating the anisotropic conductive sheet and electronic component of the present invention into a portable electronic device, a small or thin portable electronic device can be realized. Examples of portable electronic devices include mobile phones, cameras such as digital cameras and video cameras, portable audio players, portable DVD players, and portable notebook computers.

The electronic member connecting method of the present invention can be suitably applied to electrical connection between electronic members in the fields of electronic computers, electronic digital watches, electronic cameras, and the like.
The embodiments of the present invention disclosed above are merely examples, and the scope of the present invention is not limited to the scope of these descriptions. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

DESCRIPTION OF SYMBOLS 10 ... Anisotropic conductive sheet 20 ... Anisotropic conductive layer 30 ... Sheet member 31 ... Conductor area | region 32 ... Conductivity formation part 33 ... Insulation part 34 ... Intersection part 40 40 '... Electronic members 41, 41', 42, 42 '... Electrode 100 ... Upper mold 101 ... Plate-like base material 102 ... Magnetic body part 103 ... Non-magnetic body part 110 ... Lower mold 111 ... Plate-like base material 112 ... Magnetic body part 113 ... Non-magnetic body part 120 ... Spacer 130 ... Molding space 131 ... Conductor area formation planned part 132: Insulation part formation scheduled parts 140a, 140b ... electromagnets

Claims (8)

n layers (n is an integer of 2 or more) anisotropic conductive layers,
Each anisotropic conductive layer is composed of a conductive forming portion in which conductive regions extending in the thickness direction of the sheet member are formed in stripes at predetermined intervals, and an insulating portion that insulates the conductive regions from each other. A sheet member,
Directly opposite to each other physician, in the i layer and the i + 1-th layer (i is an arbitrary integer of 1 to n-1) set of the anisotropic conductive layer, conductor region of anisotropic conductive layer of the i layer and the An anisotropic conductive sheet , wherein each anisotropic conductive layer is arranged so that the conductor region of the i + 1 anisotropic conductive layer intersects the upper surface of the sheet when projected from the top. Having three or more anisotropic conductive layers,
2. The anisotropic conductive sheet according to claim 1, wherein each anisotropic conductive layer is arranged so that intersections of the conductor regions as viewed from the upper surface of the sheet are projected at substantially the same position. .   The anisotropic conductive sheet according to claim 1 or 2, wherein the thickness of each anisotropic conductive layer is 1 mm or less. (1) A plurality of sheet members each composed of a conductive formation portion in which conductor regions extending in the thickness direction of the sheet member are formed in stripes at predetermined intervals and an insulating portion that insulates the conductor regions from each other. the step of preparing, and (2) each other physician directly opposite the conductive of the i layer and the i + 1-th layer (i is an arbitrary integer of 1 to n-1) in the set of the sheet member, the sheet member of the i layer A method for producing an anisotropic conductive sheet, comprising: a step of laminating the sheet member so that the body region and the conductor region of the sheet member of the (i + 1) th layer intersect from the upper surface of the sheet when projected.   5. The anisotropic structure according to claim 4, wherein in the step (2), the sheet members are sequentially stacked such that the intersections of the conductor regions viewed from the upper surface of the sheet are projected at substantially the same position. A method for producing a conductive sheet.   The method for manufacturing an anisotropic conductive sheet according to claim 4 or 5, wherein the thickness of each sheet member is 1 mm or less.   Electrically connecting these electronic members by interposing the anisotropic conductive sheet according to any one of claims 1 to 3 between the first electronic member and the second electronic member. An electronic member connection method characterized by the above.   The first electronic member, the anisotropic conductive sheet according to any one of claims 1 to 3 disposed on the first electronic member, and the first electronic member of the sheet are disposed. An electronic component comprising: a second electronic member disposed on a side opposite to the first side and electrically connected to the first electronic member via the sheet.

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