TWI611432B - Anisotropic conductive sheet and conductive powder - Google Patents

Abstract

The invention provides an anisotropic conductive sheet and a conductive powder. The anisotropic conductive sheet includes a conductive path forming portion which is disposed at a position corresponding to a terminal of a detection target element and has conductivity in a thickness direction of the anisotropic conductive sheet. The conductive path forming portion is formed by anisotropic conductive The sheet is formed by arranging particles of conductive powder in an elastic insulating material in a thickness direction; and an insulating portion that supports the conductive path forming portion and insulates the conductive path forming portion. Each of the particles of the conductive powder has a 3D grid structure and includes a hole connecting the inner region and the outer region of the particle of the conductive powder, and an elastic insulating material is filled in the hole and connects the outer region of the particle of the conductive powder as one body.

Description

Anisotropic conductive sheet and conductive powder

[Cross-reference to related applications] This application claims the rights of Korean Patent Application No. 10-2015-0068173, filed in the Korean Intellectual Property Office on May 15, 2015, and the disclosure content of the Korean patent application The entire text is incorporated herein by reference.

The present invention relates to one or more embodiments of an anisotropic conductive sheet, and more particularly, to an anisotropic conductive sheet containing a conductive powder to avoid degradation in durability due to frequent contact with terminals of a detection target element. One or more embodiments, and a method for manufacturing an anisotropic conductive sheet.

Generally, anisotropic conductive sheets are used in inspection procedures to check whether the manufactured components have defects or errors. For example, when conducting an electrical test to check whether a manufactured component has defects or errors, an anisotropic conductive sheet is placed on the component to be tested And the detection device, rather than directly contacting the element with the detection device. The reason is that the detection device is relatively expensive, and when a new detection device is replaced due to abrasion or damage due to frequent contact with the detection target element, difficulties and high costs are encountered. Therefore, the anisotropic conductive sheet can be detachably attached to the upper side of the detection device, and the element to be detected can be transmitted through the element by contacting the element with the anisotropic conductive sheet instead of the detection device. The anisotropic conductive sheet is electrically connected to the detection device. Thereafter, the electronic signal generated from the self-detection device can be transmitted to the element through the anisotropic conductive sheet.

1 and FIG. 2, such an anisotropic conductive sheet 100 may be disposed between the detection target element 140 and the detection device 130 so that the terminal 141 of the detection target element 140 and the pad 131 of the detection device 130 are electrically connected. . The anisotropic conductive sheet 100 may include a conductive path forming section 110 disposed at a position corresponding to the terminal 141 of the detection target element 140, and having conductivity in a thickness direction of the anisotropic conductive sheet 100, and a conductive path forming section. 110 is formed by disposing particles of conductive powder 111 in an elastic insulating material in a thickness direction of the anisotropic conductive sheet 100; and an insulating portion 120 that supports the conductive path forming portion 110 and makes each of the conductive path forming portion 110 Are insulated from each other. When the anisotropic conductive sheet 100 is mounted on the detection device 130, the conductive path forming portion 110 of the anisotropic conductive sheet 100 will contact the pad 131 of the detection device 130, and the detection target element 140 may be in contact with the anisotropic conductive sheet. The conductive path forming portion 110 of 100 is in contact.

When the detection target element 140 is transferred using the insert, it can be placed on the anisotropic conductive sheet 100 and simultaneously formed with the conductive path forming portion of the anisotropic conductive sheet 100. 110 contacts. After that, the electronic signal can be transmitted from the detection device 130 to the detection target element 140 through the anisotropic conductive sheet to electrically detect the detection target element 140.

The conductive path forming portion 110 of the anisotropic conductive sheet 100 formed by disposing the particles of the conductive powder 111 in the elastic insulating material can frequently contact the terminals of the detection target element. As described above, if the terminals of the detection target element can frequently contact the conductive path forming portion 110, particles of the conductive powder 111 distributed in the elastic insulating material can be easily separated outward from the elastic insulating material. Specifically, since the particles of the conductive powder 111 have a spherical shape, the particles of the conductive powder 111 can be easily separated from the elastic insulating material. As described above, if the particles of the conductive powder 111 are separated, the conductivity of the anisotropic conductive sheet 100 can be reduced, and therefore, the detection cannot be performed reliably.

In addition, since the particles of the conductive powder 111 are solid metal particles, the conductive powder 111 has poor elasticity. Therefore, the terminals and pads that are in contact with the particles of the conductive powder 111 or the adjacent conductive powder 111 can be easily damaged or broken.

The present invention provides one or more embodiments of an anisotropic conductive sheet and a conductive powder having elasticity and firmly distributed in a conductive path forming portion of the anisotropic conductive sheet.

Additional concepts will be presented in some form in the following description of the present invention, and it will obviously come from the description in some form or be learned from the implementation of the embodiments of the present invention.

According to one or more embodiments, the anisotropic conductive sheet is disposed between the detection target element and the detection device, so that the terminal of the detection target element is electrically connected to the pad of the detection device. The anisotropic conductive sheet includes: The conductive path forming portion is disposed at a position corresponding to the terminal of the detection target element and has conductivity in the thickness direction of the anisotropic conductive sheet. The conductive path forming portion is formed in the thickness direction of the anisotropic conductive sheet to Formed by disposing particles of conductive powder in an elastic insulating material; and an insulating portion that supports the conductive path forming portion and insulates each of the conductive path forming portions from each other, wherein each of the particles of the conductive powder has a 3D grid structure, and A plurality of holes connecting the inner region and the outer region of the particles of the conductive powder are included, and the elastic insulating material of the conductive path forming portion is filled in the holes, and the inner region and the outer region of the particles of the conductive powder are connected as a whole.

Each of the particles of the conductive powder has a spherical shape as a whole.

Each of the particles of the conductive powder has one of a polyprism shape as a whole, a cylindrical shape, and an egg shape.

The conductive powder is manufactured through a 3D brushing process.

The conductive powder is selected from copper (Cu), nickel (Ni), cobalt (Co), nickel (Ni) -cobalt (Co), gold (Au), silver (Ag), palladium (Pd), and rhodium (Rh) At least one metal material, wherein the metal material is in an alloyed, plated, or nano-coated form.

Each of the particles of the conductive powder has a grid structure formed of a synthetic resin, calcium carbonate, or a ceramic material, and is plated or nano-coated with a member selected from copper (Cu), nickel (Ni), cobalt (Co), and nickel. (Ni) -Cobalt (Co), Gold (Au), Silver (Ag), Palladium (Pd) And at least one metal material of rhodium (Rh).

Each of the particles of the conductive powder has an uneven surface in which a portion of the concave portion and a portion of the convex portion are arranged along the surface.

According to one or more embodiments, the conductive powder is used for an anisotropic conductive sheet, the anisotropic conductive sheet is disposed between the detection target element and the detection device so that the terminal of the detection target element is electrically connected to the detection device The pad, wherein the anisotropic conductive sheet includes: a conductive path forming portion arranged at a position corresponding to the terminal of the detection target element, and having conductivity in a thickness direction of the anisotropic conductive sheet, and the conductive path is formed. The portion is formed by disposing particles of conductive powder in an elastic insulating material in a thickness direction of the anisotropic conductive sheet; and an insulating portion that supports the conductive path forming portion and insulates each of the conductive path forming portions from each other, wherein Each of the particles of the powder has a 3D mesh structure, and includes a plurality of holes connecting the inner region and the outer region of the particles of the conductive powder, and the elastic insulating material of the conductive path forming portion is filled in the holes, and the conductive powder is connected to the conductive powder. The inner and outer regions of the particles are one.

10, 100‧‧‧ Anisotropic conductive sheet

20, 110‧‧‧ conductive path forming section

21, 22, 23, 24, 25, 26, 111‧‧‧ conductive powder

21a, 22a, 23a, 24a, 25a, 26a

30, 120‧‧‧ Insulation Department

40, 140‧‧‧ Detection target element

41, 141‧‧‧ terminals

50, 130‧‧‧ detection devices

51, 131‧‧‧ liner

These and / or other ideas will become apparent or easier to understand by the description of the following embodiments together with the accompanying drawings, in which: FIG. 1 is a schematic diagram showing an anisotropic conductive sheet according to a conventional technique; FIG. 2 is a schematic diagram of the operating state of the anisotropic conductive sheet depicted in FIG. 1; FIG. 3 is a schematic diagram of the anisotropic conductive sheet according to an embodiment; 4 is a schematic diagram of an example of particles of conductive powder of the anisotropic conductive sheet depicted in FIG. 3; FIG. 5 is a schematic diagram of an electrical detection process using the anisotropic conductive sheet depicted in FIG. 3; and FIGS. 6 to 6 FIG. 10 is a schematic diagram of particles of a conductive powder according to another embodiment.

The embodiments and examples shown in the drawings will now be described in detail, wherein like element symbols represent like elements throughout the figures. In this regard, the embodiments of the present invention may have different forms and should not be construed as being limited by the descriptions mentioned in the present invention. Therefore, the present invention explains the concept of the present invention only by describing the following embodiments with reference to the drawings. The term "and / or" as used herein includes one or more of any or all combinations of the associated listed items. When, for example, the expression "at least one" precedes the elements of the list, the elements of the entire list are decorated rather than the individual elements of the list.

Hereinafter, the anisotropic conductive sheet according to the embodiment will be described with reference to the drawings.

According to an embodiment, the anisotropic conductive sheet 10 is disposed between the detection target element 40 and the detection device 50 to be detected, so that the terminal 41 of the detection target element 40 is electrically connected to the pad 51 of the detection device 50. The anisotropic conductive sheet 10 includes a conductive path forming portion 20 and an insulating portion 30.

The conductive path forming portion 20 is disposed at a position corresponding to the terminal 41 of the detection target element 40 and has conductivity in the thickness direction of the anisotropic conductive sheet 10. The conductive path forming portion 20 is formed by disposing particles of the conductive powder 21 in an elastic insulating material.

The elastic insulating material may include a polymer substance having a crosslinked structure. Various curable polymer-forming materials can be used to obtain this crosslinked polymer substance. Specific examples thereof include: conjugated diene rubber, such as polybutadiene rubber, natural rubber, polyisoprene rubber, styrene-butadiene copolymer rubber and acrylonitrile-butadiene copolymer rubber, and Its hydrogenated products; block copolymer rubbers, such as styrene-butadiene-diene block copolymer rubber and styrene-isoprene block copolymer rubber, and their hydrogenated products; chloroprene rubber; Urethane rubber; polyester rubber; epichlorohydrin rubber; silicone rubber; ethylene-propylene copolymer rubber; and ethylene-propylene-diene copolymer rubber.

If the conductive path forming portion 20 is required to have weather resistance, materials other than the conjugated diene rubbers listed above may be used. For example, silicone rubber can be used based on the viewpoint of mold and processing ability and electrical properties.

Silicone rubber can be obtained from liquid silicone rubber by crosslinking or condensation. Liquid silicone rubber may have one at a shear rate of 10 ^-1 sec measured viscosity of not higher than ¹⁰⁵ poises (Poise) at. The silicone rubber may be one of a condensation cure silicone rubber, an addition cure silicone rubber, and a silicone rubber having a vinyl group or a hydroxyl group. Examples of the silicone rubber may include dimethyl silicone raw rubber, methyl vinyl silicone raw rubber, and methylphenyl vinyl silicone raw rubber.

The conductive powder 21 may have magnetic properties. The conductive powder 21 may include a member selected from copper (Cu), nickel (Ni), cobalt (Co), nickel (Ni) -cobalt (Co), gold (Au), silver (Ag), palladium (Pd), and rhodium (Rh At least one metal material, wherein the metal material is in an alloyed, plated, or nano-coated form. If the conductive powder 21 includes nickel particles as core particles, an electromagnet can be used in the manufacturing process to make the conductive powder 21 easily align with the anisotropic conductive sheet 10. If the conductive powder 21 contains nickel particles as core particles, the core particles may be plated with gold having a high degree of conductivity.

The conductive powder 21 may have an average particle diameter of about 3 micrometers to 500 micrometers. If the average particle diameter of the conductive powder 21 is about 3 micrometers or more, the conductive path forming portion 20 having easy deformability, low resistance, and high contact reliability can be easily formed. Provided that the average particle diameter of the conductive powder 21 is about 500 μm or less, the conductive path forming portion 20 having a small size and stable conductivity can be easily formed.

Each particle of the conductive powder 21 may have a 3D network structure, and the 3D network structure has a plurality of holes 21 a connecting an inner region and an outer region of each particle of the conductive powder 21. For example, the holes 21 a formed in the particles of the conductive powder 21 may be uniformly distributed. Therefore, the elastic insulating material of the conductive path forming portion 20 may be filled in the holes 21 a of the particles of the conductive powder 21, and may be connected to the inner region and the outer region of the particles of the conductive powder 21 as one body.

That is, the conductive powder 21 can be mixed with the elastic insulating material as if it were one, and therefore can be stably disposed in the conductive path forming portion 20. Conductive powder 21 The particles may have a spherical shape as a whole, and the holes 21a may have any shape.

The insulating portion 30 supports the conductive path forming portions 20 and insulates each of the conductive path forming portions 20 from each other to prevent a current from flowing between the conductive path forming portions 20. The insulating portion 30 may include the same material as the elastic insulating material as the conductive path forming portion 20. For example, the insulating portion 30 may include a silicone rubber.

The conductive powder 21 of the anisotropic conductive sheet 10 of the example can be manufactured using a 3D printer. For example, a high-precision 3D printer capable of printing an object having a micrometer cell size may be provided, and the particle shape of the conductive powder 21 to be obtained may be input to the 3D printer to form the conductive powder 21.

For example, since a 3D printer in recent years can make a printed object have a precise shape, a conductive powder 21 having an arbitrary mesh type can be prepared.

After the conductive powder 21 is manufactured using a 3D printer, the conductive powder 21 may be plated with a metal having high conductivity. In this case, the conductive powder 21 may be plated with a metal having high conductivity by a method such as an electroless plating method, a plating method, or a nanoparticle coating method. However, the manufacturing method of the conductive powder 21 is not limited to this.

Examples of the anisotropic conductive sheet 10 have the following operational effects.

First, as shown in FIG. 3, the anisotropic conductive sheet 10 is placed on the detection device 50, and as shown in FIG. 5, the detection target element 40 is placed on the anisotropic conductive sheet 10. At this time, the conductive path forming portion 20 of the anisotropic conductive sheet 10 is pressed by the terminal 41 of the detection target element 40, and this ensures that the conductive path forming portion 20 becomes electrically conductive. Then, the electronic signal can be transmitted from the detection device 50 to the detection target element 40 through the conductive path forming section 20 to perform a detection operation.

In the example of the anisotropic conductive sheet 10, each particle of the conductive powder 21 has a mesh structure having a plurality of holes 21a, and the elastic insulating material of the conductive path forming portion 20 is filled in the holes 21a to make the conductive powder 21 It can behave as one with elastic insulation. Therefore, the contact area between the conductive powder 21 and the elastic insulating material may be increased, and although the terminals 41 of the detection target element 40 are frequently in contact with the conductive path forming portion 20, the conductive powder 21 may not be separated from the conductive path forming portion 20. As described above, since the conductive powder 21 is stably maintained in the conductive path forming portion 20, although the anisotropic conductive sheet 10 has been used for a long time, the conductivity of the conductive path forming portion 20 may not be reduced, and anisotropic conductive may be used. The sheet 10 is reliably detected.

In addition, since the particles of the conductive powder 21 of the anisotropic conductive sheet 10 are not solid metal particles and include holes 21a filled in an elastic insulating material, the particles of the conductive powder 21 can have a high degree of elasticity. Since the pores 21a of the particles of the conductive powder 21 are uniformly distributed, the conductive powder 21 can easily absorb the external force even though an external force is applied to the conductive powder 21 in an arbitrary direction. Therefore, although the conductive powder 21 is disposed in an arbitrary direction, the conductive powder 21 can effectively absorb an external force in an arbitrary direction applied thereto. Due to these elastic properties of the conductive powder 21, the terminals or pads that are in contact with the particles of the conductive path forming portion 20 or the conductive powder 21 adjacent thereto may not be damaged or broken.

In addition, since the conductive powder 21 has elasticity, the detection target element 40 can press the conductive path forming portion 20 deeper in the thickness direction of the anisotropic conductive sheet 10. That is, since it is possible to effectively compress the conductive path forming portion 20, it can increase the distance.

Examples of the anisotropic conductive sheet 10 can be modified as described below.

In the embodiment described above, the diameter of the holes 21a is about 1/4 to about 1/5 of the diameter of the particles of the conductive powder 21, and the holes 21a overlap each other. However, this is not a limiting example. In another embodiment, as shown in FIG. 6, the holes 22 a may be formed in the spherical particles of the conductive powder 22, and the diameter of the holes 22 a is about 1/3 to about 1/4 of the diameter of the spherical particles of the conductive powder 22. . In another embodiment, as shown in FIG. 7, many holes 23 a may be formed in the particles of the conductive powder 23, and the diameter of the holes 23 a may be about 1/6 to about 1/7 of the diameter of the particles of the conductive powder 23. . However, these examples are not limiting examples. That is, the size of the holes can be selectively changed according to the material of the conductive powder and the design requirements.

In the embodiments described above, the conductive powder 21, the conductive powder 22, or the conductive powder 23 has spherical particles. However, the shape of the particles of the conductive powder is not limited to this. In another embodiment, as shown in FIG. 8, the conductive powder 24 may include cylindrical particles each having a grid structure. In addition, the conductive powder may include polyprism-shaped particles each having a grid structure.

In the embodiments described above, the conductive powder having spherical particles or cylindrical particles is described. However, these examples are not limiting examples. In other embodiments, as shown in FIGS. 9 and 10, a conductive powder 25 or a conductive powder 26 including particles in an egg shape may be used. Each of the egg-shaped particles of the conductive powder 25 or the conductive powder 26 may have a mesh structure.

In the previous embodiments, a conductive powder containing a metal material is described. However, in other embodiments, the conductive powder may include particles all having a grid structure. And formed of a synthetic resin, calcium carbonate, or a ceramic material, and the particles may be plated or nano-coated selected from copper (Cu), nickel (Ni), cobalt (Co), nickel (Ni) -cobalt (Co) At least one of metal materials, gold (Au), silver (Ag), palladium (Pd), and rhodium (Rh).

In another embodiment, the conductive powder may include particles each having an uneven surface, wherein a portion of the concave portion and a portion of the convex portion are arranged along the surface. In this case, the terminal of the detection target element can be brought into contact with the conductive powder by high voltage, and therefore, a stable contact point can be maintained.

As described above, according to one or more of the above-described embodiments, each of the particles of the conductive powder distributed in the conductive path forming portion of the anisotropic conductive sheet has a 3D mesh structure, and thus the conductive powder can be accurately maintained In an elastic insulating material of the conductive path forming portion. Therefore, although the anisotropic conductive sheet is frequently or repeatedly used in the inspection process, the conductive powder may not be separated from the conductive path forming portion, and thus the anisotropic conductive sheet may have a long life.

In addition, since each of the particles of the conductive powder has a mesh structure with a plurality of holes, the elasticity of the conductive powder can be increased. Therefore, the terminals or pads that are in contact with the particles of the conductive powder or adjacent conductive powder may not be damaged or broken.

It should be understood that the embodiments described herein should be considered only as a description of one phenomenon and have no limiting purpose. Descriptions of features or concepts in each embodiment should typically be considered as available for other similar features or concepts in other embodiments.

When one or more embodiments have been described with reference to the drawings, persons of ordinary skill in the art will understand that they do not violate the principles of the invention as defined by the following patent application scope Under the spirit and scope of the concept, various forms and details can be changed.

10‧‧‧ Anisotropic conductive sheet

20‧‧‧Conductive path forming section

21‧‧‧ conductive powder

30‧‧‧ Insulation Department

40‧‧‧ Detection target element

41‧‧‧Terminal

50‧‧‧detection device

51‧‧‧ cushion

Claims (8)

An anisotropic conductive sheet is disposed between a detection target element and a detection device, so that a terminal of the detection target element is electrically connected to a pad of the detection device. The anisotropic conductive sheet includes: a conductive path The formation portion is disposed at a position corresponding to the terminal of the detection target element, and has conductivity in a thickness direction of the anisotropic conductive sheet, and the conductive path formation portion is formed in the anisotropic direction by An anisotropic conductive sheet is formed by disposing conductive powder particles in an elastic insulating material in the thickness direction; and an insulating portion that supports the conductive path forming portion and insulates each of the conductive path forming portions from each other, wherein Each of the particles of the conductive powder has a 3D mesh structure, and includes a plurality of holes connecting an inner region and an outer region of the particles of the conductive powder, and the elasticity of the conductive path forming portion An insulating material is filled into the hole, and the inner region and the outer region of the particles of the conductive powder are connected as one body, wherein the The aperture of the charged powder particles of uniform distribution. The anisotropic conductive sheet according to item 1 of the scope of patent application, wherein each of the particles of the conductive powder has a spherical shape as a whole. The anisotropic conductive sheet according to item 1 of the patent application scope, wherein each of the particles of the conductive powder has one of a shape of a polygonal column as a whole, a shape of a cylinder, and a shape of an egg. . The anisotropic conductive sheet according to item 1 of the scope of patent application, wherein the conductive powder is manufactured through a 3D printing process. The anisotropic conductive sheet according to item 1 of the scope of patent application, wherein the conductive powder includes at least one metal material selected from the group consisting of copper, nickel, cobalt, nickel-cobalt, gold, silver, palladium, and rhodium, wherein The metallic material is in the form of alloying, plating or nano coating. The anisotropic conductive sheet according to item 1 of the scope of patent application, wherein each of the particles of the conductive powder has a mesh structure formed of a synthetic resin, calcium carbonate, or a ceramic material, and is plated or coated Rice coating is at least one metal material selected from the group consisting of copper, nickel, cobalt, nickel-cobalt, gold, silver, palladium, and rhodium. The anisotropic conductive sheet according to item 1 of the scope of patent application, wherein each of the particles of the conductive powder has an uneven surface, wherein a portion of the concave portion and a portion of the convex portion are along the Surface configuration. A conductive powder for an anisotropic conductive sheet, the anisotropic conductive sheet is disposed between a detection target element and a detection device, so that a terminal of the detection target element is electrically connected to a pad of the detection device , Wherein the anisotropic conductive sheet includes: a conductive path forming portion disposed at a position corresponding to the terminal of the detection target element, and having conductivity in a thickness direction of the anisotropic conductive sheet, The conductive path forming portion is formed by disposing particles of the conductive powder in an elastic insulating material in the thickness direction of the anisotropic conductive sheet; and An insulating portion that supports the conductive path forming portion and insulates each of the conductive path forming portions from each other, wherein each of the particles of the conductive powder has a 3D mesh structure and includes a plurality of connection sites Holes in the inner and outer regions of the particles of the conductive powder, and the elastic insulating material of the conductive path forming portion is filled in the holes, and the inside of the particles of the conductive powder is connected The region and the outer region are as a whole, wherein the holes of the particles of the conductive powder are uniformly distributed.