WO2023008083A1 - 異方導電性シートおよびその製造方法、電気検査装置ならびに電気検査方法 - Google Patents
異方導電性シートおよびその製造方法、電気検査装置ならびに電気検査方法 Download PDFInfo
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- WO2023008083A1 WO2023008083A1 PCT/JP2022/026199 JP2022026199W WO2023008083A1 WO 2023008083 A1 WO2023008083 A1 WO 2023008083A1 JP 2022026199 W JP2022026199 W JP 2022026199W WO 2023008083 A1 WO2023008083 A1 WO 2023008083A1
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- conductive
- layer
- conductive sheet
- elastomer composition
- anisotropically
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/01—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts characterised by the form or arrangement of the conductive interconnection between the connecting locations
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
Definitions
- the present invention relates to an anisotropically conductive sheet and its manufacturing method, an electrical inspection device, and an electrical inspection method.
- An electrical inspection is usually performed by electrically contacting a substrate (having electrodes) of an electrical inspection device and a terminal of an object to be inspected such as a semiconductor device, and applying a predetermined voltage between the terminals of the object to be inspected. by reading the current of An anisotropically conductive sheet is placed between the substrate of the electrical inspection device and the object to be inspected in order to ensure electrical contact between the electrodes of the substrate of the electrical inspection device and the terminals of the object to be inspected. be.
- An anisotropically conductive sheet is a sheet that has conductivity in the thickness direction and insulation in the surface direction, and is used as a probe (contactor) in electrical inspection. Such an anisotropically conductive sheet is used with a pressing load applied to ensure electrical connection between the board of the electrical inspection apparatus and the inspection object. Therefore, the anisotropically conductive sheet is required to be easily elastically deformed in the thickness direction.
- Such an anisotropic conductive sheet includes a base sheet having a plurality of through holes penetrating in the thickness direction, a plurality of conductive portions arranged in the plurality of through holes, and end faces of the plurality of conductive portions.
- An electrical connector having a plurality of covering conductive protrusions is known (see, for example, US Pat. It is said that the conductive portion may be a metal thin film (plated film) or the like formed on the inner wall surface of the through hole.
- an indentation load is applied to the surface of the anisotropically conductive sheet while the object to be inspected is placed thereon.
- the metal thin films formed on the wall surfaces of the plurality of holes are formed by repeated pressurization and depressurization by pushing.
- the conductive layer is easily cracked or peeled off, and poor conduction is likely to occur.
- variations in resistance values between the plurality of conductive layers are likely to occur.
- the present invention has been made in view of the above problems, and an anisotropically conductive sheet capable of suppressing cracks and peeling of the conductive layer and maintaining good conductivity even when pressurization and depressurization by pushing is repeated, and
- An object of the present invention is to provide a manufacturing method, an electrical inspection apparatus, and an electrical inspection method thereof.
- the anisotropically conductive sheet of the present invention has a first surface located on one side in the thickness direction, a second surface located on the other side, and a portion extending between the first surface and the second surface.
- an insulating layer having a plurality of through holes; a plurality of first conductive layers disposed on inner wall surfaces of the plurality of through holes; and the first conductive layers inside the plurality of through holes.
- the method for producing an anisotropically conductive sheet of the present invention comprises a first surface located on one side in the thickness direction, a second surface located on the other side, and a gap between the first surface and the second surface.
- an anisotropic conductive sheet that can suppress cracks and peeling of the conductive layer and maintain good conductivity even when pressure and pressure are repeatedly pressed by pressing, a method for manufacturing the same, an electrical inspection device, and an electrical An inspection method can be provided.
- FIG. 1A is a partial plan view showing an anisotropically conductive sheet according to the present embodiment
- FIG. 1B is a partially enlarged sectional view of the anisotropically conductive sheet of FIG. 1A taken along line 1B-1B
- FIG. 2 is a partially enlarged cross-sectional view of the anisotropically conductive sheet of FIG. 1A taken along line 1B-1B
- 3A to 3D are partial enlarged cross-sectional views showing the method for manufacturing an anisotropically conductive sheet according to this embodiment.
- 4A and 4B are partially enlarged cross-sectional views showing the method for manufacturing an anisotropically conductive sheet according to this embodiment.
- FIG. 5A is a cross-sectional view showing an electrical inspection apparatus according to this embodiment
- FIG. 5A is a cross-sectional view showing an electrical inspection apparatus according to this embodiment
- FIG. 5B is a bottom view showing an example of an inspection object.
- FIG. 6 is a partially enlarged cross-sectional view of an anisotropically conductive sheet according to a modification.
- 7A and 7B are partially enlarged plan views around through holes on the first surface of an anisotropically conductive sheet according to a modification.
- FIG. 8 is a partially enlarged plan view of the first surface of an anisotropically conductive sheet according to a modification.
- FIG. 9 is a partially enlarged cross-sectional view of an anisotropically conductive sheet according to a modification.
- FIG. 10 is a schematic diagram showing a method of measuring electrical resistance using the electrical inspection apparatus of FIG. 5A.
- FIG. 1A is a partially enlarged plan view of anisotropically conductive sheet 10 according to the present embodiment
- FIG. 1B is a partially enlarged view of line 1B-1B of anisotropically conductive sheet 10 of FIG. 1A. It is a sectional view.
- FIG. 2 is a partially enlarged cross-sectional view of the anisotropically conductive sheet 10 of FIG. 1 taken along line 1B-1B. All the drawings below are schematic diagrams, and the scale and the like are different from the actual ones.
- an anisotropically conductive sheet 10 includes an insulating layer 11 having a first surface 11a, a second surface 11b, and a plurality of through holes 12 penetrating therebetween; A plurality of first conductive layers 13A arranged on the inner wall surface of each of the through holes 12, and a plurality of first conductive layers 13A arranged on the first surface 11a and the second surface 11b and continuous with the (one or more) first conductive layers 13A The plurality of second conductive layers 13B, the plurality of first groove portions 14a and the plurality of second groove portions 14b arranged between the plurality of second conductive layers 13, and the insides of the plurality of through holes 12 (first conductive and a plurality of conductive fillings 15 filled in a plurality of cavities 12') surrounded by layer 13A.
- the inspection object is arranged on the first surface 11a of the insulating layer 11 (one surface of the anisotropically conductive sheet 10).
- the insulating layer 11 has a first surface 11a located on one side in the thickness direction, a second surface 11b located on the other side in the thickness direction, and penetrates between the first surface 11a and the second surface 11b. and a plurality of through holes 12 (see FIGS. 1A and 1B).
- the insulating layer 11 has elasticity such that it is elastically deformed when pressure is applied in the thickness direction. That is, it is preferable that the insulating layer 11 includes at least an elastic layer.
- the elastic layer preferably comprises a crosslinked elastomer composition.
- the elastomer contained in the elastomer composition is not particularly limited, but examples thereof include silicone rubber, urethane rubber (urethane-based polymer), acrylic rubber (acrylic-based polymer), and ethylene-propylene-diene copolymer (EPDM). , chloroprene rubber, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, polybutadiene rubber, natural rubber, polyester-based thermoplastic elastomer, olefin-based thermoplastic elastomer, and fluorine-based rubber. Among them, silicone rubber is preferable.
- the silicone rubber may be either an addition condensation type or a radical type.
- the elastomer composition may further contain a cross-linking agent as necessary.
- the cross-linking agent can be appropriately selected according to the type of elastomer.
- silicone rubber cross-linking agents include addition reaction catalysts such as metals, metal compounds, metal complexes (platinum, platinum compounds, their complexes, etc.) having catalytic activity for hydrosilylation reactions; benzoyl peroxide, bis -Organic peroxides such as 2,4-dichlorobenzoyl peroxide, dicumyl peroxide and di-t-butyl peroxide.
- cross-linking agents for acrylic rubbers (acrylic polymers) include epoxy compounds, melamine compounds, isocyanate compounds, and the like.
- the crosslinked product of the silicone rubber composition may be an addition crosslinked product of a silicone rubber composition containing an organopolysiloxane having a hydrosilyl group (SiH group), an organopolysiloxane having a vinyl group, and an addition reaction catalyst, or a vinyl addition crosslinked product of a silicone rubber composition containing an organopolysiloxane having a group and an addition reaction catalyst; crosslinked product of a silicone rubber composition containing an organopolysiloxane having a SiCH 3 group and an organic peroxide curing agent, etc. is included.
- a silicone rubber composition containing an organopolysiloxane having a hydrosilyl group (SiH group), an organopolysiloxane having a vinyl group, and an addition reaction catalyst or a vinyl addition crosslinked product of a silicone rubber composition containing an organopolysiloxane having a group and an addition reaction catalyst; crosslinked product of a silicone rubber composition containing an organopol
- the elastomer composition may further contain other components such as tackifiers, silane coupling agents and fillers, if necessary.
- the glass transition temperature of the crosslinked product of the elastomer composition is not particularly limited, but is preferably ⁇ 40° C. or lower, more preferably ⁇ 50° C. or lower, from the viewpoint of making it difficult for terminals to be inspected to be damaged. preferable.
- the glass transition temperature can be measured according to JIS K 7095:2012.
- the storage modulus at 25° C. of the crosslinked product of the elastomer composition is preferably 1.0 ⁇ 10 7 Pa or less, more preferably 1.0 ⁇ 10 5 to 9.0 ⁇ 10 6 Pa.
- the storage modulus of the crosslinked product of the elastomer composition can be measured according to JIS K 7244-1:1998/ISO6721-1:1994.
- the glass transition temperature and storage modulus of the crosslinked product of the elastomer composition can be adjusted by the composition of the elastomer composition.
- the axial direction of the through hole 12 may be substantially parallel to the thickness direction of the insulating layer 11 (for example, the angle with respect to the thickness direction of the insulating layer 11 is 10° or less), or may be inclined (for example, The angle with respect to the thickness direction may be more than 10° and 50° or less, preferably 20 to 45°.
- the axial direction of through hole 12 is substantially parallel to the thickness direction of insulating layer 11 (see FIG. 1B).
- the axial direction refers to the direction of a line that connects the center of gravity (or center) of the opening of the through hole 12 on the side of the first surface 11a and the opening on the side of the second surface 11b.
- the shape of the opening of the through-hole 12 on the first surface 11a is not particularly limited, and may be, for example, a square or other polygon.
- the shape of the opening of through-hole 12 in first surface 11a is circular (see FIGS. 1A and 1B).
- the shape of the opening of the through-hole 12 on the side of the first surface 11a and the shape of the opening on the side of the second surface 11b may be the same or different. From the viewpoint of connection stability with respect to, the same is preferable.
- the equivalent circle diameter D of the openings of the through-holes 12 on the first surface 11a side may be set so that the center-to-center distance (pitch) p of the openings of the plurality of through-holes 12 falls within the range described later. It is not limited, but preferably 1 to 330 ⁇ m, more preferably 2 to 200 ⁇ m, even more preferably 10 to 100 ⁇ m (see FIG. 2).
- the equivalent circle diameter D of the opening of the through hole 12 on the first surface 11a side is the equivalent circle diameter of the opening of the through hole 12 when viewed along the axial direction of the through hole 12 from the first surface 11a side. (the diameter of a perfect circle corresponding to the area of the opening).
- the equivalent circle diameter D of the opening of the through hole 12 on the first surface 11a side and the equivalent circle diameter D of the opening of the through hole 12 on the second surface 11b side may be the same or different. good.
- the center-to-center distance (pitch) p of the openings of the plurality of through holes 12 on the first surface 11a side is not particularly limited, and can be appropriately set according to the pitch of the terminals of the inspection object (see FIG. 2).
- the pitch of HBM (High Bandwidth Memory) terminals as the inspection object is 55 ⁇ m
- the pitch of PoP (Package on Package) terminals is 400 to 650 ⁇ m.
- the distance p can be, for example, 5-650 ⁇ m.
- the center-to-center distance p of the openings of the plurality of through holes 12 on the first surface 11a side should be 5 to 55 ⁇ m. is more preferred.
- the center-to-center distance p between the openings of the plurality of through holes 12 on the first surface 11a side refers to the minimum value among the center-to-center distances between the openings of the plurality of through holes 12 on the first surface 11a side.
- the center of the opening of the through hole 12 is the center of gravity of the opening.
- the center-to-center distance p of the openings of the plurality of through holes 12 may be constant in the axial direction, or may be different.
- the ratio (T/D) of the axial length of the through-hole 12 (that is, the thickness T of the insulating layer 11) and the equivalent circle diameter D of the opening of the through-hole 12 on the first surface 11a side (T/D) is not particularly limited. is preferably 3 to 40 (see FIG. 2).
- the thickness of the insulating layer 11 is not particularly limited as long as it can ensure insulation at non-conducting portions, but can be, for example, 40 to 700 ⁇ m, preferably 100 to 400 ⁇ m.
- Conductive layer 13 (first conductive layer 13A, second conductive layer 13B)
- the conductive layer 13 is arranged corresponding to one or more through-holes 12 (or cavities 12') (see FIG. 1B).
- the conductive layer 13 includes a first conductive layer 13A arranged on the inner wall surface of the through hole 12, and on the first surface 11a and the second surface 11b (around the opening of the through hole 12). It has one or more first conductive layers 13A and a continuous second conductive layer 13B.
- Two adjacent conductive layers 13 and 13 (or two second conductive layers 13B and 13B) are insulated by a first groove portion 14a and a second groove portion 14b (see FIG. 1B). That is, the unit conductive layer 13 surrounded by the dashed line functions as one conductive path (see FIGS. 1A and 1B).
- the material forming the first conductive layer 13A and the material forming the second conductive layer 13B may be the same or different, and are the same from the viewpoints of easy manufacturing and stable conduction. Preferably.
- the volume resistivity of the material forming the conductive layer 13 (the first conductive layer 13A, the second conductive layer 13B ) is not particularly limited as long as it provides sufficient electrical conductivity. It is preferably 4 ⁇ m or less, more preferably 1.0 ⁇ 10 ⁇ 5 to 1.0 ⁇ 10 ⁇ 9 ⁇ m.
- the volume resistivity of the material forming the conductive layer 13 can be measured by the method described in ASTM D991.
- the material constituting the conductive layer 13 may have a volume resistivity that satisfies the above range.
- materials forming the conductive layer 13 include metal materials such as copper, gold, platinum, silver, nickel, tin, iron, or alloys thereof, and carbon materials such as carbon black.
- the conductive layer 13 preferably contains one or more selected from the group consisting of gold, silver and copper (as a main component) from the viewpoint of having high conductivity and flexibility. “Contained as a main component” means, for example, 70 mass % or more, preferably 80 mass % or more of the conductive layer 13 .
- the thickness of the conductive layer 13 may be within a range in which sufficient conduction is obtained and the through hole 12 is not blocked (a range in which the cavity 12' is formed). Further, the thickness of the conductive layer 13 (especially the second conductive layer 13B) is such that when the insulating layer 11 is pressed in the thickness direction, the plurality of conductive layers 13 (especially the second conductive layer 13B) sandwich the first groove portion 14a or the second groove portion 14b. It is sufficient that the conductive layers 13B) do not come into contact with each other. Specifically, the thickness of conductive layer 13 (especially second conductive layer 13B) is preferably smaller than the width and depth of first groove 14a and second groove 14b.
- the thickness of the conductive layer 13 can be 0.1 to 5 ⁇ m. If the thickness of the conductive layer 13 is more than a certain value, it is easy to obtain sufficient conduction. Hard to get off.
- the thickness t of the conductive layer 13 refers to the thickness in the direction parallel to the thickness direction of the insulating layer 11 on the first surface 11a and the second surface 11b (that is, the second conductive layer 13B). On the inner wall surface (that is, the first conductive layer 13A), the thickness is in the direction orthogonal to the thickness direction of the insulating layer 11 (see FIG. 2).
- First groove portion 14a and second groove portion 14b are grooves (grooves) formed on one surface and the other surface of the anisotropically conductive sheet 10, respectively. Specifically, the first groove portion 14a is arranged between the plurality of second conductive layers 13B (or the plurality of conductive layers 13) on the first surface 11a to provide insulation therebetween. The second groove portion 14b is arranged between the plurality of second conductive layers 13B (or the plurality of conductive layers 13) on the second surface 11b to provide insulation therebetween.
- the cross-sectional shape of the first groove portion 14a (or the second groove portion 14b) in the direction orthogonal to the extending direction is not particularly limited, and may be any of quadrangular, semicircular, U-shaped, and V-shaped. good.
- the cross-sectional shape of the first groove portion 14a (or the second groove portion 14b) is quadrangular.
- the width w and the depth d of the first groove portion 14a (or the second groove portion 14b) are such that when the anisotropically conductive sheet 10 is pressed in the thickness direction, it is It is preferable that the second conductive layer 13B on one side and the second conductive layer 13B on the other side do not contact each other (see FIG. 2).
- the width w of the first groove portion 14a is preferably larger than the thickness of the second conductive layer 13B (or the conductive layer 13). It is preferably 2 to 40 times the thickness.
- the width w of the first groove portion 14a (or the second groove portion 14b) is perpendicular to the direction in which the first groove portion 14a (or the second groove portion 14b) extends on the first surface 11a (or the second surface 11b). is the maximum width in the direction of
- the depth d of the first groove portion 14a may be the same as or larger than the thickness of the second conductive layer 13B (or the conductive layer 13). That is, the deepest part of first groove portion 14 a (or second groove portion 14 b ) may be positioned on first surface 11 a of insulating layer 11 or may be positioned inside insulating layer 11 .
- the second conductive layer 13B (or the conductive layer 13) on one side and the second conductive layer 13B (or the conductive layer 13) on either side of the first groove portion 14a (or the second groove portion 14b) are set to a range in which they do not come into contact with each other.
- the depth d of the first groove portion 14a is preferably larger than the thickness of the second conductive layer 13B (or the conductive layer 13), and the second conductive layer 13B (or More preferably, it is 1.5 to 100 times the thickness of the conductive layer 13).
- the depth d of the first groove portion 14a (or the second groove portion 14b) is the depth from the surface of the second conductive layer 13B (or the conductive layer 13) to the deepest portion in the direction parallel to the thickness direction of the insulating layer 11. (See Figure 2).
- the width w and depth d of the first groove portion 14a and the second groove portion 14b may be the same or different.
- conductive filler 15 The conductive filler 15 is filled in the cavity 12' surrounded by the first conductive layer 13A (or the conductive layer 13) (of the through-hole 12), and maintains the conductivity while maintaining the first conductive layer 13A. (or the conductive layer 13) can be suppressed from being peeled off.
- the conductive filler 15 preferably fills 50% or more of the volume in the cavity 12', preferably the entire cavity 12', from the viewpoint of facilitating maintenance of conductivity. That is, the end portion of the conductive filler 15 on the side of the first surface 11a (or the end portion on the side of the second surface 11b) substantially coincides with the first surface 11a (or the second surface 11b) of the insulating layer 11. is preferred.
- the conductive filler 15 contains a crosslinked product of a conductive elastomer composition containing conductive particles and an elastomer.
- Materials constituting the conductive particles are not particularly limited, but include metal particles such as copper, gold, platinum, silver, nickel, tin, iron, or alloys thereof, and carbon particles such as carbon black. .
- particles containing (as a main component) one or more selected from the group consisting of gold, silver, and copper are preferred from the viewpoint of excellent conductivity and flexibility.
- "Contained as a main component” means, for example, 50% by mass or more, preferably 60% by mass or more, relative to the conductive elastomer composition.
- the material forming the conductive particles may be the same as or different from the material forming the first conductive layer 13A and the second conductive layer 13B (or the conductive layer 13).
- the average particle size of the conductive particles is not particularly limited as long as it can fill the inside of the cavity 12 ′, but for example, about 0.3 to 30% of the circle equivalent diameter of the through hole 12 on the first surface 11a side. can be Specifically, the average particle size of the conductive particles can be about 0.3 to 30 ⁇ m.
- the average particle size of the conductive particles is the 50% particle size (D50) measured with a laser diffraction particle size analyzer. It is the particle size at the point where the particle size is cumulatively 50% by mass from the smaller particle size in the volume-based particle size distribution.
- the type of elastomer is not particularly limited, and the same elastomer as that used for the elastomer composition forming the insulating layer 11 can be used.
- the type of elastomer used for the conductive elastomer composition may be the same as or different from the type of elastomer used for the elastomer composition forming insulating layer 11 .
- silicone rubber is preferable from the viewpoint of flexibility.
- the silicone rubber may be either addition condensation type or radical type as described above.
- the content of the elastomer is preferably 5-50% by mass with respect to the total amount of the conductive particles and the elastomer.
- the elastomer content is 5% by mass or more, the adhesion to the first conductive layer 13A (or the conductive layer 13) is likely to increase, and the crosslinked product of the conductive elastomer composition has sufficient flexibility. It is easier to suppress cracks and peeling of the first conductive layer 13A (or the conductive layer 13). If the content of the elastomer is 50% by mass or less, the conductivity is less likely to be impaired, so even if cracks occur in the first conductive layer 13A (or the conductive layer 13), it is easy to ensure the conductivity. .
- the conductive elastomer composition may further contain other components such as a cross-linking agent as necessary.
- a cross-linking agent is not particularly limited, and the same cross-linking agent as that used for the elastomer composition forming the insulating layer 11 can be used.
- the storage modulus at 25°C of the crosslinked product of the conductive elastomer composition is not particularly limited, but usually tends to be higher than the storage modulus at 25°C of the crosslinked product of the elastomer composition that constitutes the insulating layer 11. .
- the pressure is moderately low from the viewpoint of suppressing troubles due to concentration of the pressure on the conductive filler 15 when pushing.
- the storage elastic modulus at 25° C. of the crosslinked product of the conductive elastomer composition is preferably 1 to 300 MPa, more preferably 2 to 200 MPa. Storage modulus can be measured in compressive deformation mode in a manner similar to that described above.
- the storage modulus of the crosslinked product of the conductive elastomer composition can be adjusted by the composition of the composition. For example, if the content of the conductive particles is reduced, the storage modulus of the crosslinked product of the composition is lowered.
- the crosslinked product of the conductive elastomer composition preferably has a certain level of conductivity or more.
- the volume resistivity of the crosslinked product of the conductive elastomer composition is preferably 10 ⁇ 2 ⁇ m or less.
- the conductive elastomer composition may remain on the first surface 11a of the insulating layer 11 and the like in the manufacturing process of the anisotropically conductive sheet 10. Even so, the electrical connection between the conductive layer 13 (or the second conductive layer 13B) and the terminals of the test object is less likely to be disturbed.
- the volume resistivity of the crosslinked product of the conductive elastomer composition is more preferably 1 ⁇ 10 ⁇ 8 to 1 ⁇ 10 ⁇ 2 ⁇ m. Volume resistivity can be measured by the same method as above.
- the anisotropically conductive sheet 10 of the present embodiment has a conductive filling filled inside the cavity 12′ (cavity derived from the through hole 12) surrounded by the conductive layer 13 (or the first conductive layer 13A). has an object 15;
- the conductive filler 15 can adhere well to and reinforce the conductive layer 13 (or the first conductive layer 13A). Therefore, even if the pressure is repeatedly applied or removed during an electrical inspection, the conductive layer 13 can be prevented from cracking or peeling (from the inner wall surface of the through-hole 12), and stable electrical connection can be achieved. can be done.
- FIGS. 3A to 3D, 4A and B are cross-sectional schematic diagrams showing a method for producing the anisotropically conductive sheet 10 according to the present embodiment.
- the anisotropically conductive sheet 10 is produced by: 1) a step of preparing an insulating sheet 21 (insulating layer) having a plurality of through holes 12 (see FIGS. 3A and 3B); 3) a step of forming one continuous conductive layer 22 on the surface of (see FIG. 3C); 4) forming the first groove 14a and the second groove 14b on the first surface 21a and the second surface 21b of the insulating sheet 21 filled with the conductive elastomer composition (see FIG. 3D), respectively; , dividing the conductive layer 22 into a plurality of conductive layers 13 (see FIGS. 4A and 4B).
- the conductive layer 13 is the conductive layer 13 (the first conductive layer 13A and the second conductive layer 13B) described above (see the broken line portion in FIG. 1B).
- an insulating sheet 21 is prepared (see FIG. 3A).
- the insulating sheet 21 is, for example, a sheet containing a crosslinked product of the elastomer composition.
- the formation of the through holes 12 can be performed by any method. For example, it can be carried out by a method of mechanically forming holes (for example, press processing, punch processing), a laser processing method, or the like. Among them, it is more preferable to form the through-holes 12 by a laser processing method because it is possible to form the through-holes 12 that are fine and have high shape accuracy.
- the laser can be an excimer laser, a carbon dioxide laser, a YAG laser, etc., which can accurately perforate resin. Among them, it is preferable to use an excimer laser.
- the pulse width of the laser is not particularly limited, and may be any of microsecond laser, nanosecond laser, picosecond laser, and femtosecond laser. Also, the wavelength of the laser is not particularly limited.
- the opening diameter of the through-hole 12 tends to be large on the laser-irradiated surface of the insulating layer 11, which is irradiated with the laser for the longest time. In other words, it tends to have a tapered shape in which the opening diameter increases from the inside of the insulating layer 11 toward the laser irradiation surface.
- laser processing may be performed using an insulating sheet 21 further having a sacrificial layer (not shown) on the laser-irradiated surface.
- a laser processing method for the insulating sheet 21 having a sacrificial layer can be performed, for example, by a method similar to that described in International Publication No. 2007/23596.
- one continuous conductive layer 22 is formed over the entire surface of the insulating sheet 21 in which the plurality of through holes 12 are formed (see FIG. 3C). Specifically, the conductive layer 22 is formed continuously on the inner wall surfaces of the plurality of through holes 12 and the first surface 21a and the second surface 21b around the openings of the insulating sheet 21 . Thereby, a plurality of cavities 12 ′ surrounded by the conductive layer 13 corresponding to the plurality of through holes 12 are formed.
- the conductive layer 22 can be formed by any method, a plating method (e.g., an electroless plating method) is preferred because a thin and uniform thickness of the conductive layer 22 can be formed without blocking the through holes 12. or electroplating method).
- a plating method e.g., an electroless plating method
- step 3 the conductive elastomer composition L is filled inside the plurality of cavities 12′ (inside the plurality of through holes 12) surrounded by the conductive layer 13 of the obtained insulating sheet 21 (Fig. 3D reference).
- the conductive elastomer composition L may further contain a solvent and the like in addition to the above conductive particles and elastomer.
- the viscosity of the conductive elastomer composition L at 25°C is not particularly limited, but it can be, for example, 100 Pa ⁇ s or less, preferably 10 to 80 Pa ⁇ s, from the viewpoint of filling the insides of the plurality of cavities 12'.
- the viscosity of the conductive elastomer composition can be measured with a known viscometer at 25°C.
- the method of filling the conductive elastomer composition L is not particularly limited. can be done.
- the conductive elastomer composition L filled inside the plurality of cavities 12' is crosslinked.
- the conductive elastomer composition L contains a solvent, it is preferable to further dry it.
- the cross-linking method may be, for example, heating, depending on the type of elastomer and cross-linking agent.
- the heating temperature can be, for example, 100 to 200° C. in the case of silicone rubber.
- first groove portion 14a and the second groove portion 14b are formed in the first surface 21a and the second surface 21b of the insulating sheet 21, respectively, and the conductive layer 22 is formed into a plurality of conductive layers 13 (or second groove portions 13).
- conductive layer 13B (see FIGS. 4A and B). Thereby, a plurality of conductive layers 13 shown in FIG. 1B are formed.
- a plurality of first grooves 14a and second grooves 14b can be formed by any method. For example, it is preferable to form the plurality of first grooves 14a and the plurality of second grooves 14b by a laser processing method. In the present embodiment, the plurality of first grooves 14a (or the plurality of second grooves 14b) can be formed in a grid pattern on the first surface 21a (or the second surface 21b).
- the method for manufacturing the anisotropically conductive sheet 10 according to the present embodiment may further include steps other than those described above, if necessary. For example, 5) pretreatment for facilitating the formation of the conductive layer 22 may be performed between the steps 2) and 3).
- Step 5 It is preferable to perform desmearing (pretreatment) on the insulating sheet 21 having the plurality of through-holes 12 to facilitate the formation of the conductive layer 22 .
- Desmear treatment includes a wet method and a dry method, and either method may be used.
- wet desmear treatment known wet processes such as the sulfuric acid method, the chromic acid method, and the permanganate method can be adopted in addition to the alkali treatment.
- Plasma treatment is an example of dry desmear treatment.
- the insulating sheet 21 is composed of a crosslinked product of a silicone-based elastomer composition
- plasma treatment of the insulating sheet 21 not only enables ashing/etching, but also oxidizes the surface of silicone, A film can be formed.
- the silica film the plating solution can easily enter the through holes 12 and the adhesion between the conductive layer 22 and the inner wall surfaces of the through holes 12 can be enhanced.
- the oxygen plasma treatment can be performed using, for example, a plasma asher, a high-frequency plasma etching device, or a microwave plasma etching device.
- cross-linking of the conductive elastomer composition may be performed after step 4) instead of step 3).
- the obtained anisotropically conductive sheet can preferably be used for electrical inspection.
- FIG. 5A is a cross-sectional view showing an example of an electrical inspection apparatus 100 according to the present embodiment
- FIG. 5B is a bottom view showing an example of an inspection object 120 used in the electrical inspection method.
- the electrical inspection apparatus 100 uses the anisotropically conductive sheet 10 of FIG. 1B, and is an apparatus for inspecting electrical characteristics (such as continuity) between terminals 121 (between measurement points) of an object 120 to be inspected, for example. .
- electrical characteristics such as continuity
- the inspection object 120 is also shown.
- the electrical inspection device 100 has an inspection substrate 110 having a plurality of electrodes and an anisotropically conductive sheet 10.
- the inspection substrate 110 has a plurality of electrodes 111 facing each measurement point of the inspection object 120 on the surface facing the inspection object 120 .
- the anisotropically conductive sheet 10 is arranged on the surface of the test substrate 110 on which the electrodes 111 are arranged so that the electrodes 111 and the conductive layer 13 on the second surface 11b side of the anisotropically conductive sheet 10 are in contact with each other. It is
- the electrical inspection apparatus 100 inserts the guide pins 110A of the inspection board 110 into the positioning holes (not shown) of the anisotropically conductive sheet 10 to position the anisotropically conductive sheet 10 on the inspection board 110.
- the electrical inspection apparatus 100 inserts the guide pins 110A of the inspection board 110 into the positioning holes (not shown) of the anisotropically conductive sheet 10 to position the anisotropically conductive sheet 10 on the inspection board 110.
- An object to be inspected 120 is arranged on the anisotropically conductive sheet 10, and these are pressurized by a pressurizing jig so as to be fixed.
- the inspection object 120 is not particularly limited, but examples include various semiconductor devices (semiconductor packages) such as HBM and PoP, electronic components, printed circuit boards, and the like. If the test object 120 is a semiconductor package, the measurement points may be bumps (terminals). Further, when the inspection object 120 is a printed circuit board, the measurement point can be a land for measurement provided on a conductive pattern or a land for component mounting.
- the inspection object 120 is, for example, a chip having a total of 264 solder ball electrodes (material: lead-free solder) with a diameter of 0.2 mm and a height of 0.17 mm, arranged at a pitch of 0.3 mm. included (see FIG. 5B).
- the electrical inspection method laminates an inspection substrate 110 having an electrode 111 and an inspection object 120 with an anisotropically conductive sheet 10 interposed therebetween, and inspects the substrate. and a step of electrically connecting the electrodes 111 of the test substrate 110 and the terminals 121 of the test object 120 via the anisotropically conductive sheet 10 .
- the electrodes 111 of the inspection substrate 110 and the terminals 121 of the inspection object 120 are sufficiently easily conducted through the anisotropically conductive sheet 10, so that the inspection object 120 may be pressurized, or may be brought into contact under a heated atmosphere.
- Anisotropically conductive sheet 10 includes conductive filler 15 containing a crosslinked product of a conductive elastomer composition filled inside cavity 12 ′ (inside through hole 12 ).
- conductive filler 15 containing a crosslinked product of a conductive elastomer composition filled inside cavity 12 ′ (inside through hole 12 ).
- the insulating layer 11 is an elastic layer containing a crosslinked product of an elastomer composition.
- the insulating layer 11 is not limited to this. It may further have other layers.
- the insulating layer 11 preferably includes at least an elastic layer containing a crosslinked product of an elastomer composition, and further includes a heat-resistant resin layer within a range that does not impair the elasticity as a whole.
- the heat-resistant resin layer contains a heat-resistant resin composition having a glass transition temperature higher than that of the crosslinked elastomer composition forming the elastic layer.
- the conductive filler 15 filled in the through-hole 12 (or the cavity 12 ′) can usually have a higher storage modulus than the crosslinked elastomer composition forming the insulating layer 11 . Therefore, during an electrical inspection, the pressure when pushing is likely to be concentrated on the portion of the conductive filler 15, and it is difficult to return to the original shape even if the pressure is released. As a result, gaps are likely to be formed in the thickness direction of the sheet near the opening 12a of the through-hole 12 (or cavity 12'), making it difficult to maintain sufficient conductivity.
- the insulating layer 11 further includes the heat-resistant resin layer 11Y, it is possible to prevent the pressure from being excessively concentrated on the conductive filler 15 during pressing. A gap is less likely to be formed in the thickness direction of the sheet near the opening 12a, and conductivity is less likely to be impaired.
- FIG. 6 is a partially enlarged cross-sectional view of an anisotropically conductive sheet according to a modification.
- the insulating layer 11 has an elastic layer 11X and a heat-resistant resin layer 11Y.
- the elastic layer 11X and the heat-resistant resin layer 11Y may each be one, or two or more.
- the insulating layer 11 includes one elastic layer 11X and two heat-resistant resin layers 11Y (a first heat-resistant resin layer including the first surface 11a and a second and a second heat-resistant resin layer including the surface 11b (see FIG. 6).
- the glass transition temperature of the heat-resistant resin composition forming the heat-resistant resin layer 11Y is preferably higher than the glass transition temperature of the cross-linked elastomer composition forming the elastic layer 11X. Specifically, since the electrical test is performed at about -40 to 150°C, the glass transition temperature of the heat-resistant resin composition is preferably 150°C or higher, more preferably 150 to 500°C. preferable. The glass transition temperature of the heat-resistant resin composition can be measured by the same method as described above.
- the linear expansion coefficient of the heat-resistant resin composition forming the heat-resistant resin layer 11Y is preferably lower than the linear expansion coefficient of the crosslinked elastomer composition forming the elastic layer 11X.
- the linear expansion coefficient of the heat-resistant resin composition forming the heat-resistant resin layer 11Y is preferably 60 ppm/K or less, more preferably 50 ppm/K.
- the storage elastic modulus at 25° C. of the heat-resistant resin composition forming the heat-resistant resin layer 11Y is higher than the storage elastic modulus at 25° C. of the crosslinked elastomer composition forming the elastic layer 11X. preferable.
- the composition of the heat-resistant resin composition is not particularly limited as long as the glass transition temperature, linear expansion coefficient, or storage elastic modulus satisfies the above ranges.
- the resin contained in the heat-resistant resin composition is preferably a heat-resistant resin whose glass transition temperature satisfies the above range; examples thereof include polyamide, polycarbonate, polyarylate, polysulfone, polyethersulfone, polyphenylene sulfide, Engineering plastics such as polyetheretherketone, polyimide, and polyetherimide, acrylic resins, urethane resins, epoxy resins, and olefin resins are included.
- the heat-resistant resin composition may further contain other components such as fillers, if necessary.
- compositions of the heat-resistant resin compositions forming the two heat-resistant resin layers 11Y may be the same or different.
- the heat-resistant resin layer 11Y including the first surface 11a (or the second surface 11b) is immersed in a chemical solution during, for example, an electroless plating process, the heat-resistant resin composition forming these layers has chemical resistance. It is preferred to have
- the thickness of the heat-resistant resin layer 11Y is not particularly limited, it is preferably thinner than the thickness Tx of the elastic layer 11X from the viewpoint of preventing the elasticity of the insulating layer 11 from being impaired (see FIG. 2).
- the ratio (Ty/Tx) of the thickness of the heat-resistant resin layer 11Y to the thickness Tx of the elastic layer 11X is, for example, preferably 1/99 to 30/70, more preferably 2/98 to 10/90. It is more preferable to have
- the ratio of the thickness of the heat-resistant resin layer 11Y is at least a certain value, it is possible to give the insulating layer 11 appropriate hardness (resilience) to the extent that the elasticity (ease of deformation) of the insulating layer 11 is not impaired.
- the thicknesses Ty of the two heat-resistant resin layers 11Y may be the same or different, but are preferably the same from the viewpoint of preventing the anisotropic conductive sheet 10 from warping, for example.
- the thickness ratio of the two heat-resistant resin layers 11Y is preferably 0.8 to 1.2, for example.
- the depth d of the first groove portion 14a is the heat-resistant resin layer including the first surface 11a. It is preferably thicker than the thickness of the layer 11Y (or the heat-resistant resin layer 11Y including the second surface 11b). If the first groove portion 14a (or the depth of the second groove portion 14b) is larger than the thickness of the heat-resistant resin layer 11Y, the heat-resistant resin layer 11Y is completely cut off. , the surrounding conductive layer 13 is not pushed together, and it is easy to suppress concentration of excessive pressure on the conductive filler 15 .
- the heat-resistant resin layer 11Y has a higher elastic modulus than the elastic layer 11X.
- the surrounding conductive layer 13 is likely to be pushed together.
- the surrounding conductive layers 13 can also be prevented from being pushed together, and the influence on the surrounding conductive layers 13 can be reduced.
- the insulating layer 11 may further have layers other than those described above, if necessary. Examples of other layers include an adhesive layer (not shown) disposed between two elastic layers 11X when there are two.
- the insulating layer 11 when the insulating layer 11 includes the heat-resistant resin layer 11Y, the insulating layer 11 has a region (non It preferably further includes a groove region 16 (see FIG. 1A).
- the heat-resistant resin layer 11Y when the heat-resistant resin layer 11Y is completely divided by the first groove portion 14a (or the second groove portion 14b), it may be difficult to suppress thermal deformation (thermal expansion or thermal contraction) of the elastic layer 11X.
- the non-groove region 16 in which the first groove 14a (or the second groove 14b) is not formed within a range that does not interfere with electrical conduction the thermal deformation of the elastic layer 11X can be suppressed by the heat-resistant resin layer 11Y. can be done. Only one non-groove region 16 may be provided on the entire first surface 11a (or second surface 11b) (see FIG. 1A), or a plurality of non-groove regions 16 may be provided so as to surround the plurality of conductive layers 13. good.
- FIG. 1A an example in which one conductive layer 13 (or second conductive layer 13B) is arranged for one through-hole 12 (or first conductive layer 13A) is shown (see FIG. 1A). ), but not limited to.
- FIGS. 7A and B are partially enlarged plan views around the through-hole 12 in the first surface 11a of the anisotropically conductive sheet 10 according to the modification. As shown in FIGS. 7A and B, one conductive layer 13 (or second conductive layer 13B) may be arranged for two or more through holes 12 (or first conductive layer 13A).
- FIG. 8 is a partially enlarged plan view of the first surface 11a of the anisotropically conductive sheet 10 according to the modification.
- at least a portion of the plurality of second conductive layers 13B (or conductive layers 13) may differ from each other in area or shape, depending on the type of inspection object 120.
- FIG. 8 a chip, which is one of the inspection objects 120, may have a plurality of terminals assigned to the same signal. In this case, rather than forming one second conductive layer 13B for each terminal of the chip (that is, each through hole 12) (see FIG.
- each terminal to which the same signal is assigned (that is, multiple It is preferable to form one large-area second conductive layer 13B (13B-1, 13B-2 or 13B-3) for each through-hole 12 (see FIG. 8).
- the second conductive layer 13B-1 can correspond to GND (ground) and the second conductive layer 13B-3 can correspond to the power supply line.
- the resistance value between these terminals can be reduced during an electrical inspection, so that it is resistant to noise and the potential is likely to be stable. As a result, inspection accuracy is likely to be improved.
- the second conductive layer 13B is arranged on the first surface 11a and the second surface 11b is shown, but the present invention is not limited to this.
- the second conductive layer 13B may be arranged on neither the first surface 11a nor the second surface 11b, or may be arranged on only one of the first surface 11a and the second surface 11b.
- FIG. 9 is a partially enlarged cross-sectional view of an anisotropically conductive sheet 10 according to a modification. As shown in FIG. 9, the second conductive layer 13B may be arranged on only one of the first surface 11a and the second surface 11b.
- an anisotropically conductive sheet is used for electrical inspection is shown, but the present invention is not limited to this, and electrical connection between two electronic members, such as between a glass substrate and a flexible printed circuit board, is possible. It can also be used for electrical connection between substrates and electronic components mounted on the substrate.
- Conductive Elastomer Composition As a conductive elastomer composition, ThreeBond 3303B (containing Ag particles, silicone rubber and a cross-linking agent) manufactured by ThreeBond was prepared.
- the conductive elastomer composition was heated at 170° C. for 30 minutes to obtain a crosslinked product with a film thickness of 4 mm.
- the storage elastic modulus of the obtained crosslinked product was measured at 25° C. in compression deformation mode in accordance with JIS K 7244-1:1998/ISO6721-1:1994 and found to be 2.8 MPa.
- volume resistivity of the crosslinked product of the resulting conductive elastomer composition was measured by the method described in ASTM D 991 and found to be 3 ⁇ 10 ⁇ 5 ⁇ m.
- Example 1 As an insulating sheet, a silicone rubber sheet having a plurality of through-holes 12 (equivalent circle diameter of openings of the plurality of through-holes 12 on the first surface 11a side: 85 ⁇ m) was prepared. A continuous gold (Au) layer was formed on the surface of this sheet (the inner wall surface of the through hole 12, the first surface 11a and the second surface 11b) by a plating method. Next, the conductive elastomer composition is dropped onto the first surface 11a of the obtained sheet, and the conductive elastomer composition is poured into the cavities 12' corresponding to the through holes 12 while vacuuming from the second surface 21b side. was introduced and filled.
- Au gold
- the conductive elastomer composition was crosslinked (cured) by heating at 170°C. Then, a plurality of first grooves 14a and a plurality of second grooves 14b were formed on the first surface 11a and the second surface 11b of the obtained sheet, respectively, to divide the conductive layer into a plurality of conductive layers 13. As shown in FIG. Thereby, an anisotropically conductive sheet was obtained.
- the anisotropically conductive sheet 10 is positioned on the test substrate 110 by inserting the guide pins 110A of the test substrate 110 into the positioning holes (not shown) of the anisotropically conductive sheet 10. placed.
- a test chip 120 as an object to be inspected was placed on the anisotropically conductive sheet 10 and fixed with a pressure jig.
- test chip 120 As the test chip 120, a total of 264 solder ball electrodes (material: lead-free solder) having a diameter of 0.2 mm and a height of 0.17 mm are arranged at a pitch of 0.3 mm. Two of them were electrically connected to each other by wiring inside the test chip 120 (see FIG. 5B).
- the electrical resistance value was measured by the following method.
- a DC current of 10 mA was constantly applied by the DC power supply 130 and the constant current control device 131, and the voltage between the external terminals of the test substrate 110 during pressurization was measured by the voltmeter 132 ( See Figure 10).
- V measured voltage value
- I 1 10 mA
- the electrical resistance value R1 includes, in addition to the electrical resistance values of the two conductive layers 13, 13, the electrical resistance value between the electrodes of the test chip 120 and the electrical resistance value between the external terminals of the test substrate 110. include. Then, the electrical resistance value R1 was measured for the conductive layer 13 of the anisotropic conductive sheet in contact with the 264 electrodes of the solder balls, and the average value was obtained.
- Table 1 shows the evaluation results.
- the resistance value after the cycle (average value ) can be reduced.
- an anisotropic conductive sheet capable of suppressing cracking and peeling of the conductive layer and maintaining good conductivity even after repeated pressurization and depressurization by pressing, and an electrical inspection method using the sheet are provided. I can do it.
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Abstract
Description
図1Aは、本実施の形態に係る異方導電性シート10の部分拡大平面図であり、図1Bは、図1Aの異方導電性シート10の1B-1B線の部分拡大断面図である。図2は、図1の異方導電性シート10の1B-1B線の部分拡大断面図である。以下の図面は、いずれも模式図であって、縮尺などは実際のものとは異なる。
絶縁層11は、厚み方向の一方の側に位置する第1面11aと、厚み方向の他方の側に位置する第2面11bと、第1面11aと第2面11bとの間を貫通する複数の貫通孔12とを有する(図1AおよびB参照)。
導電層13は、1または2以上の貫通孔12(または空洞12’)に対応して配置されている(図1B参照)。具体的には、導電層13は、貫通孔12の内壁面に配置された第1導電層13Aと、第1面11aおよび第2面11b上(の当該貫通孔12の開口部の周囲)に配置され、1または2以上の第1導電層13Aと連続する第2導電層13Bとを有する。そして、隣り合う2つの導電層13および13(または2つの第2導電層13Bおよび13B)は、第1溝部14aおよび第2溝部14bによって絶縁されている(図1B参照)。すなわち、破線で囲まれた単位の導電層13が、1つの導電路として機能する(図1AおよびB参照)。
第1溝部14aおよび第2溝部14bは、異方導電性シート10の一方の面および他方の面にそれぞれ形成された溝(凹条)である。具体的には、第1溝部14aは、第1面11a上において複数の第2導電層13B(または複数の導電層13)の間に配置され、それらの間を絶縁する。第2溝部14bは、第2面11b上において複数の第2導電層13B(または複数の導電層13)の間に配置され、それらの間を絶縁する。
導電性充填物15は、(貫通孔12の)第1導電層13A(または導電層13)で囲まれた空洞12’内に充填されており、導電性を維持しつつ、第1導電層13A(または導電層13)の剥がれを抑制しうる。
本実施の形態の異方導電性シート10は、導電層13(または第1導電層13A)で囲まれた空洞12’(貫通孔12に由来する空洞)の内部に充填された導電性充填物15を有する。導電性充填物15は、導電層13(または第1導電層13A)と良好に密着し、補強しうる。そのため、電気検査の際に、押し込みによる加圧または除圧を繰り返しても、導電層13のクラックや(貫通孔12の内壁面からの)剥がれを抑制でき、安定して電気的接続を行うことができる。
図3A~D、4AおよびBは、本実施の形態に係る異方導電性シート10の製造方法を示す断面模式図である。
まず、絶縁シート21を準備する(図3A参照)。絶縁シート21は、例えば、上記エラストマー組成物の架橋物を含むシートである。
次いで、複数の貫通孔12が形成された絶縁シート21の表面全体に、1つの連続した導電層22を形成する(図3C参照)。具体的には、絶縁シート21の、複数の貫通孔12の内壁面と、その開口部の周囲の第1面21aおよび第2面21bとに連続して導電層22を形成する。それにより、複数の貫通孔12に対応する、導電層13で囲まれた複数の空洞12’が形成される。
次いで、得られた絶縁シート21の、導電層13で囲まれた複数の空洞12’の内部(複数の貫通孔12の内部)に導電性エラストマー組成物Lを充填する(図3D参照)。
次いで、絶縁シート21の第1面21aおよび第2面21bに、第1溝部14aおよび第2溝部14bをそれぞれ形成して、導電層22を複数の導電層13(または第2導電層13B)に分割する(図4AおよびB参照)。それにより、図1Bに示される複数の導電層13を形成する。
複数の貫通孔12が形成された絶縁シート21について、導電層22を形成しやすくするためのデスミア処理(前処理)を行うことが好ましい。デスミア処理は、湿式法と乾式法があり、いずれの方法を用いてもよい。
3-1.電気検査装置
図5Aは、本実施の形態に係る電気検査装置100の一例を示す断面図であり、図5Bは、電気検査方法に用いた検査対象物120の一例を示す底面図である。
図5Aの電気検査装置100を用いた電気検査方法について説明する。
本実施の形態に係る異方導電性シート10は、空洞12’の内部(貫通孔12の内部)に充填された、導電性エラストマー組成物の架橋物を含む導電性充填物15を含む。それにより、押し込みによる加圧と除圧を繰り返しても、導電層13のクラックや剥がれを抑制でき、良好な導電性を維持することができる。それにより、正確な電気検査を行うことができる。
なお、上記実施の形態では、絶縁層11が、エラストマー組成物の架橋物を含む弾性層からなる例を示したが、これに限定されず、弾性変形しうる範囲で、耐熱性樹脂層などの他の層をさらに有してもよい。
これに対し、第1溝部14aおよび第2溝部14bの深さを上記のように大きくして、耐熱性樹脂層11Yを完全に分断することで、検査対象物120を載せて押し込んだ時の、周囲の導電層13も一緒に押し込まれないようにすることができ、周囲の導電層13への影響を低減することができる。
導電性エラストマー組成物として、スリーボンド社製ThreeBond 3303B(Ag粒子、シリコーンゴムおよび架橋剤含有)を準備した。
まず、導電性エラストマー組成物を170℃で30分間加熱して、膜厚4mmの架橋物を得た。そして、得られた架橋物の貯蔵弾性率を、JIS K 7244-1:1998/ISO6721-1:1994に準拠して、圧縮変形モードで、25℃で測定したところ、2.8MPaであった。
得られた導電性エラストマー組成物の架橋物の体積抵抗率を、ASTM D 991に記載の方法で測定したところ、3×10―5Ω・mであった。
[実施例1]
絶縁シートとして、複数の貫通孔12(第1面11a側における複数の貫通孔12の開口部の円相当径85μm)を有する、シリコーンゴムシートを準備した。このシートの表面(貫通孔12の内壁面、第1面11aおよび第2面11b)に、めっき法により連続した金(Au)層を形成した。次いで、得られたシートの第1面11a上に、導電性エラストマー組成物を滴下し、貫通孔12に対応する空洞12’内に、第2面21b側から真空引きしながら導電性エラストマー組成物を導入および充填させた。その後、170℃で加熱して、導電性エラストマー組成物を架橋(硬化)させた。そして、得られたシートの第1面11aおよび第2面11bに、複数の第1溝部14aおよび第2溝部14bをそれぞれ形成して、導電層を複数の導電層13に分割した。それにより、異方導電性シートを得た。
シートの貫通孔12に対応する空洞12’に導電性エラストマー組成物を充填しなかった以外は実施例1と同様にして、異方導電性シートを得た。
得られた異方導電性シートについて、耐久試験を行い、耐久試験後の抵抗値を、以下の方法で評価した。
図5Aに示されるように、異方導電性シート10の位置決め穴(不図示)に、検査用基板110のガイドピン110Aを挿通させて、異方導電性シート10を検査用基板110に位置決めして配置した。この異方導電性シート10上に、検査対象物としてテスト用チップ120を配置し、これらを加圧治具で固定した。
電気抵抗値の測定は、以下の方法で行った。異方導電性シート10、テスト用チップ120、および検査用基板110の電極111(検査用電極)およびその配線(不図示)を介して互いに電気的に接続された、検査用基板110の外部端子(不図示)間に、直流電源130および定電流制御装置131によって、10mAの直流電流を常時印加し、電圧計132によって、加圧時における検査用基板110の外部端子間の電圧を測定した(図10参照)。測定された電圧の値(V)をV1とし、印加した直流電流をI1(=10mA)として、下記の数式により、電気抵抗値R1を求めた。
そして、当該電気抵抗値R1の測定を、はんだボールの264個の電極と接触している、異方導電性シートの導電層13について行い、それらの平均値を求めた。
11 絶縁層
11a 第1面
11b 第2面
11X 弾性層
11Y 耐熱性樹脂層
12 貫通孔
12’ 空洞
13 導電層
14a 第1溝部
14b 第2溝部
15 導電性充填物
21 絶縁シート
22 導電層
100 電気検査装置
110 検査用基板
111 電極
120 検査対象物
121 (検査対象物の)端子
L 導電性エラストマー組成物
Claims (17)
- 厚み方向の一方の側に位置する第1面と、他方の側に位置する第2面と、前記第1面と前記第2面との間を貫通する複数の貫通孔とを有する絶縁層と、
前記複数の貫通孔のそれぞれの内壁面に配置された複数の第1導電層と、
前記複数の貫通孔のそれぞれの内部の、前記第1導電層で囲まれた空洞に充填された、複数の導電性充填物と、
を含み、
前記複数の導電性充填物のそれぞれは、導電性粒子と、エラストマーとを含む導電性エラストマー組成物の架橋物を含む、
異方導電性シート。 - 前記異方導電性シートは、
前記第1面および前記第2面上に配置され、1または2以上の前記第1導電層と連通する複数の第2導電層をさらに有し、
前記第1面上において、前記複数の第2導電層の間に配置され、それらを絶縁するための複数の第1溝部と、
前記第2面上において、前記複数の第2導電層の間に配置され、それらを絶縁するための複数の第2溝部と、
をさらに有する、
請求項1に記載の異方導電性シート。 - 前記絶縁層は、エラストマー組成物の架橋物を含み、
前記導電性エラストマー組成物の架橋物の25℃での貯蔵弾性率は、前記絶縁層を構成する前記エラストマー組成物の架橋物の25℃での貯蔵弾性率よりも高い、
請求項1または2に記載の異方導電性シート。 - 前記導電性エラストマー組成物の架橋物の25℃での貯蔵弾性率は、1~300MPaである、
請求項1または2に記載の異方導電性シート。 - 前記導電性エラストマー組成物に含まれる前記エラストマーは、シリコーンゴムである、
請求項1または2に記載の異方導電性シート。 - 前記導電性エラストマー組成物の架橋物の体積抵抗率は、10―2Ω・m以下である、
請求項1または2に記載の異方導電性シート。 - 前記導電性粒子は、金、銀および銅からなる群より選ばれる一以上の金属を含む、
請求項1または2に記載の異方導電性シート。 - 前記第1導電層は、金、銀および銅からなる群より選ばれる一以上の金属を含む、
請求項1または2に記載の異方導電性シート。 - 前記絶縁層は、エラストマー組成物の架橋物を含む弾性層と、
前記エラストマー組成物の架橋物よりもガラス転移温度が高い耐熱性樹脂組成物を含む耐熱性樹脂層と
を含む、
請求項2に記載の異方導電性シート。 - 前記耐熱性樹脂組成物の25℃での貯蔵弾性率は、前記弾性層を構成する前記エラストマー組成物の架橋物の25℃での貯蔵弾性率よりも高い、
請求項9に記載の異方導電性シート。 - 前記絶縁層は、
前記第1面を含み、かつ前記耐熱性樹脂組成物を含む第1耐熱性樹脂層と、
前記第2面を含み、かつ前記耐熱性樹脂組成物を含む第2耐熱性樹脂層と、
前記第1耐熱性樹脂層と前記第2耐熱性樹脂層との間に配置された前記弾性層と、
を有する、
請求項9または10に記載の異方導電性シート。 - 前記第1溝部の深さは、前記第1耐熱性樹脂層の厚みよりも大きく、
前記第2溝部の深さは、前記第2耐熱性樹脂層の厚みよりも大きい、
請求項11に記載の異方導電性シート。 - 前記複数の第2導電層の少なくとも一部は、互いに面積または形状が異なっている、
請求項12に記載の異方導電性シート。 - 検査対象物の電気検査に用いられる異方導電性シートであって、
前記検査対象物は、前記第1面上に配置される、
請求項1または2に記載の異方導電性シート。 - 厚み方向の一方の側に位置する第1面と、他方の側に位置する第2面と、前記第1面と前記第2面との間を貫通する複数の貫通孔とを有する絶縁層を準備する工程と、
前記複数の貫通孔の内壁面および前記第1面に連続した導電層を形成する工程と、
前記導電層が形成された前記絶縁層の前記複数の貫通孔の内部に、導電性粒子と、エラストマーとを含む導電性エラストマー組成物を充填する工程と、
前記導電性エラストマー組成物またはその架橋物が充填された前記絶縁層において、前記絶縁層の前記第1面上に複数の第1溝部を形成して、前記導電層を複数の導電層に分割する工程と
を含む、
異方導電性シートの製造方法。 - 複数の電極を有する検査用基板と、
前記検査用基板の前記複数の電極が配置された面上に配置された、請求項1または2に記載の異方導電性シートと、
を有する、
電気検査装置。 - 複数の電極を有する検査用基板と、端子を有する検査対象物とを、請求項1または2に記載の異方導電性シートを介して積層して、前記検査用基板の前記電極と、前記検査対象物の前記端子とを、前記異方導電性シートを介して電気的に接続する工程を有する、
電気検査方法。
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JPS61118977A (ja) * | 1984-11-13 | 1986-06-06 | シチズン時計株式会社 | 多電極コネクタ−構造 |
JPH07169542A (ja) * | 1993-12-17 | 1995-07-04 | Yamaichi Electron Co Ltd | Icソケット |
JP2005050782A (ja) * | 2003-06-12 | 2005-02-24 | Jsr Corp | 異方導電性コネクター装置およびその製造方法並びに回路装置の検査装置 |
WO2021100825A1 (ja) * | 2019-11-22 | 2021-05-27 | 三井化学株式会社 | シートコネクタ、シートセット、電気検査装置および電気検査方法 |
JP2022020327A (ja) * | 2020-07-20 | 2022-02-01 | 三井化学株式会社 | 異方導電性シート、異方導電性シートの製造方法、電気検査装置および電気検査方法 |
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TW202319465A (zh) | 2023-05-16 |
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