WO2023054316A1 - 接続フィルムの製造方法 - Google Patents
接続フィルムの製造方法 Download PDFInfo
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- WO2023054316A1 WO2023054316A1 PCT/JP2022/035844 JP2022035844W WO2023054316A1 WO 2023054316 A1 WO2023054316 A1 WO 2023054316A1 JP 2022035844 W JP2022035844 W JP 2022035844W WO 2023054316 A1 WO2023054316 A1 WO 2023054316A1
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- Prior art keywords
- film
- width
- anisotropic conductive
- release
- connecting film
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/40—Adhesives in the form of films or foils characterised by release liners
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
- C09J9/02—Electrically-conducting adhesives
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/321—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/36—Assembling printed circuits with other printed circuits
Definitions
- This technology relates to a method for manufacturing a connecting film that connects electronic components.
- This application is Japanese Patent Application No. 2021-159766 filed on September 29, 2021 in Japan, and Japanese Patent Application No. 2022-153351 filed on September 27, 2022 in Japan. , which application is incorporated into this application by reference.
- FIG. 24 is a perspective view schematically showing an example of a substrate of a camera module
- FIG. 24(B) is a perspective view schematically showing an example of a substrate having a polygonal mounting surface.
- the corners 101 of the board and FPC are removed, and the excess parts are removed by providing recesses 102 on the mounting surface. Efforts have been made to eliminate it.
- Patent Document 1 discloses a method for separating the connecting films by half-cutting the support film and extracting unnecessary connecting film portions.
- the technology described in Patent Document 1 increases material loss and the number of processes, leaving room for improvement in the productivity of the connecting film.
- This technology has been proposed in view of such conventional circumstances, and provides a method of manufacturing a connecting film that can achieve good productivity.
- an adhesive is printed in a predetermined shape on the release treated film, and the connecting film in the predetermined shape is formed on the release treated film.
- FIG. 1 is a perspective view schematically showing an example of a printing process in a method for manufacturing a connecting film.
- FIG. 2 is a perspective view schematically showing an example of a drying step in a method for manufacturing a connecting film.
- FIG. 3 is a perspective view schematically showing an example of a temporary attachment step of temporarily attaching a connecting film to a substrate.
- FIG. 4 is a plan view for explaining a cutting process for cutting a connecting film into a predetermined shape
- FIG. 4A is a plan view for explaining a cutting process for obtaining a linear connecting film.
- FIG. 4B is a plan view for explaining the cutting process for obtaining individual piece-shaped connecting films.
- FIG. 4 is a plan view for explaining a cutting process for cutting a connecting film into a predetermined shape
- FIG. 4A is a plan view for explaining a cutting process for obtaining a linear connecting film.
- FIG. 4B is a plan view for explaining the cutting process for obtaining individual piece-shaped connecting films.
- FIG. 5 is a plan view for explaining a cutting process in which a connecting film of a predetermined shape is not cut
- FIG. 5A is a plan view for explaining a cutting process for obtaining a linear type connecting film.
- FIG. 5B is a plan view for explaining the cutting process for obtaining individual piece-shaped connecting films.
- FIG. 6 is a plan view for explaining Production Example 1 of a connecting film having a width smaller than the slit width.
- FIG. 7 is a plan view for explaining Production Example 2 of a connecting film having a width smaller than the slit width.
- 8A and 8B are diagrams schematically showing the connecting film laminate produced in Production Example 2, where FIG. 8A is a plan view and FIG. 8B is a cross-sectional view.
- FIG. 9A is a plan view showing an example of the connecting film laminate produced in Production Example 2, and FIG. 9B shows another example of the connection film laminate produced in Production Example 2.
- FIG. 10 is a plan view for explaining another manufacturing example of the connecting film.
- FIG. 11 is a perspective view schematically showing a film roll.
- FIG. 12 is a plan view showing the mounting surface of the camera module. 13 is a cross-sectional view taken along the section line II-II shown in FIG. 12.
- FIG. FIG. 14 is a plan view showing a unit area of the film structure. 15 is a cross-sectional view taken along line IV-IV shown in FIG. 14.
- FIG. FIG. 16 is a cross-sectional view showing a bonding process for bonding the connecting film to the camera module.
- FIG. 17 is a cross-sectional view showing a state in which the substrate is peeled off from the connecting film in the attaching step.
- FIG. 18 is a cross-sectional view showing a mounting process for mounting the flexible substrate on the camera module.
- FIG. 19 is a cross-sectional view showing a connecting step of connecting the terminals of the camera module and the terminals of the flexible substrate via the connecting film.
- FIG. 20 is a cross-sectional view showing a connection structure on which a camera module is mounted.
- FIG. 21 is a cross-sectional view showing a configuration example of a connection structure on which a camera module is mounted.
- FIG. 22 is a plan view for explaining preparation of an anisotropic conductive film in Examples.
- FIG. 23 is a plan view for explaining production of an anisotropic conductive film in a conventional example.
- FIG. 24 is a perspective view schematically showing an example of a substrate of a camera module, and
- FIG. 24(B) is a perspective view schematically showing an example of a substrate having a polygonal mounting surface.
- the adhesive is printed in a predetermined shape on the release treated film, and the connecting film in the predetermined shape is formed on the release treated film.
- material loss and an increase in the number of processes can be suppressed, and good productivity of the connecting film can be obtained, compared to forming a connecting film of a predetermined shape by cutting unnecessary portions.
- the connecting film is for connecting various electronic components, and includes, for example, a filler-containing film containing a filler, an anisotropic conductive film (ACF: Anisotropic Conductive Film), a conductive film such as an isotropic conductive film, Examples include NCF (Non Conductive Film).
- ACF Anisotropic Conductive Film
- NCF Non Conductive Film
- Printing methods include screen printing using a plate (screen mask) and inkjet printing that sprays and applies adhesive.
- Screen printing is suitable for adhesives with insulating binders (ADH: Adhesive), and is also suitable for paste adhesives regardless of the presence or absence of solvents.
- ADH Adhesive
- Printing can be patterned directly from data without the need for a plate.
- Screen printing or inkjet printing may be selected in consideration of the base material, properties of the adhesive, tact time, and the like. Screen printing will be described below as an example.
- FIG. 1 is a perspective view schematically showing an example of the printing process in the manufacturing method of the connecting film.
- the adhesive 2 is passed through the mesh of the screen mask 3 by pressure from a squeegee or the like, and printed (coated) on the release treated film 1 .
- the release-treated film 1 is, as will be described later, a substrate that has been release-treated with, for example, a silicone resin.
- base materials include PET (Poly Ethylene Terephthalate), OPP (Oriented Polypropylene), PMP (Poly-4-methylpentene-1), and PTFE (Polytetrafluoroethylene).
- the adhesive 2 can be appropriately selected according to the purpose from insulating binders such as thermosetting, photo-curing, photo-heat curing, and hot-melt types. Also, the adhesive 2 may contain a filler such as conductive particles in the insulating binder.
- the screen mask 3 is a plate using a screen mesh woven from synthetic fibers such as polyester, stainless steel, or various metal fibers.
- the mesh should be made larger than the maximum diameter of the conductive particles.
- FIG. 2 is a perspective view schematically showing an example of the drying process in the manufacturing method of the connecting film.
- the adhesive 2 having a predetermined shape is dried to form a connecting film 4 having a predetermined shape on the release treated film 1 .
- an adhesive containing a filler or conductive particles may be printed in a predetermined shape, and an insulating binder may be printed in a predetermined shape.
- a filler or a conductive particle may be placed at a predetermined position of a connecting film having a predetermined shape printed on the surface of the film. Arrangement may be intentionally random or may be regular arrangement. Examples of the method for arranging include a transfer method.
- conductive particles are adhered to the slightly adhesive layer of the transfer body, and the surface of the transfer body on which the conductive particles are adhered and a connecting film of a predetermined shape are superimposed and pressed, whereby the conductive particles are transferred to the connecting film of a predetermined shape.
- Examples include a method of transferring particles.
- the transfer technique is not limited to this. Also, this does not exclude placement methods other than transfer.
- connection film that can be used for substrates with complex shapes.
- FIG. 3 is a perspective view schematically showing an example of a temporary bonding process for temporarily bonding a connecting film to a substrate.
- the connecting film 4 by temporarily attaching (adhering) the connecting film 4 having a predetermined shape onto the substrate 5 while aligning it, the connecting film 4 can be mounted without protruding from the substrate 5, thereby forming a mounted body. Stable production is possible.
- an alignment mark for example, printing on the release treatment film 1 that is necessary when temporarily attaching the connecting film 4
- the accuracy of alignment can be further improved.
- the connecting films 4 having a predetermined shape can be efficiently formed on the long release treated film 1.
- the method for manufacturing the connecting film described above includes a cutting step of cutting the release treated film 1 in a predetermined width in the longitudinal direction and a connecting step of connecting a plurality of the release treated films 1 having the predetermined width in the longitudinal direction. It is preferable to further include a winding step of winding the release treated film 1 having a predetermined width around a winding core. Thereby, a film roll can be efficiently produced.
- FIG. 4 is a plan view for explaining a cutting process for cutting a connecting film into a predetermined shape
- FIG. 4A is a plan view for explaining a cutting process for obtaining a linear connecting film
- FIG. 4B is a plan view for explaining the cutting process for obtaining individual piece-shaped connecting films.
- the connecting film 4 of the first shape is cut together with the release treatment film 1 so that the width of the connecting film 4 becomes 1/2 of the width of the first shape.
- a second shape connecting film 4 may be formed. A plurality of these may be provided in the width direction of one raw fabric.
- the connecting film 4 obtained by cutting the connecting film into a predetermined shape is effective for mounting electronic components adjacent to each other, for example, because the side portions of the long release treated film and the side portions of the connecting film overlap.
- FIG. 5 is a plan view for explaining a cutting process in which a connecting film of a predetermined shape is not cut
- FIG. 5A is a plan view for explaining a cutting process for obtaining a linear type connecting film
- FIG. 5B is a plan view for explaining the cutting process for obtaining individual piece-shaped connecting films.
- the cutting step only the release treated film 1 is cut without cutting the connecting film of a predetermined shape to form a connecting film 4 of a predetermined shape.
- the connecting film 4 obtained by cutting only the release treated film 1 the side portions of the long release treated film and the side portions of the connection film do not overlap. , it is possible to prevent part of the connecting film from protruding from the side.
- the side of the connecting film 4 may coincide with the side of the release treated film 1 (the connecting film 4 and the release treated film 1 may be slit at the same time), and the inside of the release treated film 1
- the connection film 4 may be housed in the .
- the connection film 4 is formed only by printing in this embodiment, it may have a cut surface along the side of the release treated film 1 .
- the cut surface along the side portion of the release treated film 1 the side portion of the connection film 4 and the side portion of the release treated film 1 substantially coincide as described above.
- the connecting film 4 is formed by printing, the end portion of the resin of the connecting film 4 bulges or is blurred on the inner side of the release treated film 1 .
- the connecting film 4 when the connecting film 4 is formed by printing, it can be confirmed from the fact that the side portion of the resin of the connecting film 4 is not linear with respect to the side portion of the release treated film 1 .
- fading refers to an appearance peculiar to printing, in which the side portions of the connecting film 4 appear meandering when viewed in a plan view, or the thickness of the end portion is uneven. It also has features for microscopy, which will be described later.
- FIG. 6 is a plan view for explaining Production Example 1 of a connecting film having a width smaller than the slit width.
- the connection film 52 is formed by printing the adhesive on the release treatment film 51 in the longitudinal direction with a width smaller than the slit width s, and the gap between the connection films 52 and Slits S1 to S5 are formed from the release treated film 51.
- FIG. 6 is a plan view for explaining Production Example 1 of a connecting film having a width smaller than the slit width.
- a splicing film smaller than the slit width can be produced in one step using a slit, and a narrow splicing film can be produced more easily than the conventional method in which both half-cutting and slitting are used. can.
- both ends of the slit width s are cut in the longitudinal direction so as to form the release treated film 51. Therefore, it is possible to prevent floating and wrinkling during slitting.
- the connecting film does not come into contact with the slit blade, it can be expected that the adhesion problem can be easily avoided.
- floating refers to the state in which the connecting film is separated from the release film
- wrinklele refers to the state in which lines due to curling or the like are observed on the connecting film.
- FIG. 7 is a plan view for explaining Production Example 2 of a connecting film having a width smaller than the slit width.
- an adhesive is printed in a predetermined width on the release treated film 53 in the longitudinal direction, and slits S1 to S5 are formed in the adhesive and the release treated film 53 to be the gap.
- a connecting film 54 having a width smaller than the width s is formed.
- the print width of the adhesive can be increased, for example, up to twice the width of the slit.
- the film is cut in the longitudinal direction so that one end of the slit width s is a gap and the other end is an adhesive.
- the ratio of the width of the connecting film 54 to the slit width s is preferably 0.125 or more and 0.75 or less, more preferably 0.25 or more and 0.6 or less.
- FIGS. 8A and 8B are diagrams schematically showing the connecting film laminate produced in Production Example 2, where FIG. 8(A) shows a plan view and FIG. 8(B) shows a cross-sectional view.
- the side surface of the connecting film 54 manufactured in Manufacturing Example 2 is composed of a printed side portion 55 formed by printing and a slit side portion 56 formed by slitting.
- the printed side portion 55 and the slit side portion 56 were observed with a microscope. Differences can be discerned because they are relatively sharp.
- the state of the thickness of the printed end portion has a large variation
- the state of the thickness of the slit end portion has a small variation and is stable. Therefore, when compared by observation with a microscope or the like, it can be seen that the print edge is relatively rough and the slit edge is not relatively rough.
- FIG. 9A is a plan view showing an example of the connecting film laminate produced in Production Example 2, as in FIG. 8A, and FIG. 9B is a plan view showing the connection film produced in Production Example 2.
- FIG. 4 is a plan view showing another example of a laminate;
- the slit side portion 56 of the splicing film 54 after slitting coincides with the side portion of the release treated film 53 .
- the splicing film 54 after slitting may be rewound on another releasing treatment film 57 .
- the connecting film 54 can be arranged at the center of the release treatment film 57 in the width direction.
- the connecting film By rewinding the connecting film in this manner, the position of the release treated film in the width direction can be changed. As a result, for example, when the connecting film is lengthened and wound around the winding core, it is possible to prevent a portion of the connecting film from protruding from the side portion.
- FIG. 10 is a plan view for explaining another manufacturing example of the connecting film.
- a first predetermined width of the connection films 59 to 61, a second predetermined width of the connection films 62 to 63, and a third predetermined width of the connection films 64 to 66 are formed on the release treatment film 58.
- An adhesive may be printed in a predetermined width in the longitudinal direction, slits S1 to S5 may be formed in the release treated film 58, and connection films 59 to 66 having different widths may be formed from one original film.
- each of these connecting films with different widths is half-cut to a predetermined length to prepare individual pieces of connecting films with different widths.
- a connecting film having a predetermined shape on the release treated film may be combined to form a connecting film having a predetermined shape on the release treated film.
- a complicated form is used as an example, but even if it is a simpler form or combination, by half-cutting and re-adhering to a different release treatment film at predetermined intervals, individual pieces can be formed at the same time as rewinding. You can also By using printing and slitting in this way, it is possible to easily produce splicing films with different widths. Compared to methods such as cutting, the process becomes simpler, waste of materials can be reduced, and good productivity can be obtained.
- FIG. 11 is a perspective view schematically showing a film roll.
- the film wound body is obtained by winding a film structure including a tape-shaped substrate 21 and connection films 22 and 23 formed on the substrate 21 around a core 20.
- the winding core 20 has a shaft hole into which a rotating shaft for rotating the reel is inserted, connects one longitudinal end of the film structure, and winds the film structure.
- the length of the film structure wound on the film roll is not particularly limited, but the lower limit of the length is 5 m or more, 10 m or more, or 50 m or more, and the upper limit of the length is 5000 m or less. 500 m or less, 300 m or less, or 100 m or less can be preferably used. For example, if it is longer than 300 m, it may be connected to make it longer.
- the base material 21 is a support film that supports the connection films 22 and 23 by molding the above-described release treatment film 1 into a tape shape.
- Examples of the base material 21 include PET, PMP, and PTFE.
- at least the surface on the side of the connection films 22 and 23 can be preferably used that has been subjected to release treatment with, for example, a silicone resin.
- the thickness of the base material is not particularly limited.
- the lower limit of the thickness of the base material is preferably 10 ⁇ m or more, more preferably 25 ⁇ m or more, and even more preferably 38 ⁇ m or more for separation.
- the upper limit of the thickness of the substrate is preferably 200 ⁇ m or less, more preferably 100 ⁇ m or less, and more preferably 75 ⁇ m or less, because there is concern that excessive pressure will be applied to the connecting film if it is too thick. Even more preferred. It may be 50 ⁇ m or less.
- the width of the substrate is not particularly limited.
- the lower limit of the width of the substrate may be 0.5 mm or more, preferably 1 mm or more for rewinding, more preferably 2 mm or more, and even more preferably 4 mm or more.
- the upper limit of the width of the substrate is preferably 500 mm or less, more preferably 250 mm or less, and even more preferably 120 mm or less, because there is concern that if it is too large, it may become difficult to carry and handle.
- An anisotropic conductive film containing conductive particles in an insulating binder will be described below as an example of a connecting film.
- the lower limit of the thickness of the anisotropic conductive film may be, for example, the same as the diameter of the conductive particles, preferably 1.3 times or more the diameter of the conductive particles, or 2 ⁇ m or more, preferably 10 ⁇ m or more.
- the upper limit of the thickness of the anisotropic conductive film can be, for example, 40 ⁇ m or less or twice the diameter of the conductive particles or less.
- the anisotropic conductive film may be laminated with an adhesive layer or a pressure-sensitive adhesive layer that does not contain conductive particles, and the number of layers and the laminated surface can be appropriately selected according to the object and purpose.
- the insulating resin for the adhesive layer and the pressure-sensitive adhesive layer the same materials as those for the anisotropic conductive film can be used.
- the conductive particles may be dispersed or arranged in the resin. Moreover, when the conductive particles are dispersed in the resin, they may be separated from each other without contact.
- the thickness of the anisotropic conductive film is not particularly limited like general adhesive films and adhesive films, and the lower limit may be 2 ⁇ m or more, preferably 5 ⁇ m or more, and the upper limit may be 200 ⁇ m or less, preferably 100 ⁇ m or less. good.
- an anisotropic conductive film may further laminate an adhesive film or an adhesive film.
- the connecting film is provided on a release-treated film and refers to a single connecting film that can be separated by, for example, adhering it to an object to be connected.
- conductive particles those used in known anisotropic conductive films can be appropriately selected and used.
- metal particles such as nickel, copper, silver, gold, and palladium, alloy particles such as solder, and metal-coated resin particles obtained by coating the surface of resin particles such as polyamide and polybenzoguanamine with a metal such as nickel.
- the surface may be insulated to the extent that the conductive performance is not impaired. Also, the surface shape may have projections.
- the particle size of the conductive particles is not particularly limited, but the lower limit of the particle size may be 1 ⁇ m or more, preferably 2 ⁇ m or more. Therefore, the thickness is preferably 50 ⁇ m or less, more preferably 20 ⁇ m or less.
- the particle diameter of the conductive particles can be a value measured by an image type particle size distribution meter (eg, FPIA-3000: manufactured by Malvern). This number is preferably 1000 or more, preferably 2000 or more.
- a known insulating binder can be used as the insulating binder (insulating resin).
- the curable type includes a thermosetting type, a photocurable type, and a photocurable type.
- a photoradical polymerizable resin composition containing a (meth)acrylate compound and a photoradical polymerization initiator
- a thermal radical polymerizable resin composition containing a (meth)acrylate compound and a thermal radical polymerization initiator
- a thermal anionic polymerizable resin composition containing an epoxy compound and a thermal anionic polymerization initiator.
- the composition disclosed in JP-A-2014-060025 can be used.
- thermal radical polymerization type insulating binder containing a film-forming resin, an elastomer, a (meth)acrylic monomer, a polymerization initiator, and a silane coupling agent will be described below.
- the (meth)acrylic monomer is meant to include both acrylic monomers and methacrylic monomers.
- the film-forming resin is not particularly limited, and examples thereof include phenoxy resins, unsaturated polyester resins, saturated polyester resins, urethane resins, butadiene resins, polyimide resins, polyamide resins, and polyolefin resins.
- the film-forming resin may be used singly or in combination of two or more. Among these, it is particularly preferable to use a phenoxy resin from the viewpoint of film formability, workability, and connection reliability.
- the phenoxy resin is a resin synthesized from bisphenol A and epichlorohydrin, and may be appropriately synthesized or a commercially available product.
- the content of the film-forming resin is not particularly limited, and is preferably, for example, 10% by mass to 60% by mass.
- the elastomer is not particularly limited, and examples include polyurethane resin (polyurethane-based elastomer), acrylic rubber, silicone rubber, and butadiene rubber.
- the (meth)acrylic monomer is not particularly limited, and may be, for example, a monofunctional (meth)acrylic monomer or a polyfunctional (meth)acrylic monomer having two or more functionalities. From the viewpoint of stress relaxation of the polymer, 80 mass % or more of the (meth)acrylic monomers in the insulating binder is preferably monofunctional (meth)acrylic monomers. Moreover, from the viewpoint of adhesion, the monofunctional (meth)acrylic monomer preferably has a carboxylic acid. Further, the molecular weight of the monofunctional (meth)acrylic monomer having carboxylic acid is preferably 100-500, more preferably 200-350. The content of the monofunctional (meth)acrylic monomer having carboxylic acid in the insulating binder is preferably 3% by mass to 20% by mass, more preferably 5% by mass to 10% by mass.
- the polymerization initiator is not particularly limited as long as it can cure the (meth)acrylic monomer at a predetermined temperature during thermocompression bonding, and examples include organic peroxides.
- organic peroxides include lauroyl peroxide, butyl peroxide, benzyl peroxide, dilauroyl peroxide, dibutyl peroxide, peroxydicarbonate and benzoyl peroxide. These may be used individually by 1 type, and may use 2 or more types together.
- the content of the polymerization initiator in the insulating binder is not particularly limited, and is preferably, for example, 0.5% by mass to 15% by mass.
- the silane coupling agent is not particularly limited, and examples thereof include epoxy-based silane coupling agents, acrylic-based silane coupling agents, thiol-based silane coupling agents, and amine-based silane coupling agents.
- the content of the silane coupling agent in the insulating binder is not particularly limited, and is preferably, for example, 0.1% by mass to 5.0% by mass.
- a method for manufacturing a bonded structure comprises a film structure including a tape-shaped base material and a connecting film formed on the base material. a bonding step of bonding a connecting film having a unit area of a predetermined width in the width direction of the material to a first electronic component or a second electronic component having a plurality of terminal rows; a connecting step of connecting the terminal of the component and the terminal of the second electronic component, wherein the film structure has a non-attached portion to which the connecting film is not attached in the unit area other than the locations corresponding to the plurality of terminal rows. have.
- an electronic component having a plurality of terminal rows can be mounted on the mounting surface using existing mounting equipment.
- the connection films can be attached collectively without attaching the connection films multiple times corresponding to the plurality of terminal rows.
- the “unit area” refers to an area having a predetermined length in the length direction of the base material and having, for example, a rectangular shape.
- the “non-attached portion” refers to an area in the unit area where the connecting film is not attached to the electronic component, and includes, for example, a gap where the connecting film does not exist.
- the mounting surface is composed of a plurality of projections and has terminal rows on the projections, the flat mounting surface has a plurality of terminal rows, and the mounting surface has a recess in the center. , in which a row of terminals is formed on the periphery of the mounting surface.
- a first electronic component having a recess in the center of the mounting surface has, for example, a rectangular mounting surface, and the mounting surface is formed by two opposing sides of the periphery of the recess, two adjacent sides (L-shaped), or Some have terminal rows on three sides (U-shaped, U-shaped, and C-shaped) of the periphery of the recess.
- the terminal rows may be arranged along the entire periphery.
- the peripheral edges of these recesses and the terminal row may be configured only parallel or perpendicular, but the configuration is not limited to this, and may be appropriately adjusted depending on the object. Accordingly, the shape of the unit area of the connecting film is also appropriately adjusted accordingly.
- the outer shape of the mounting surface is not limited to a rectangular shape, and may be, for example, a curved shape, a circular shape, a polygonal shape, or the like. In particular, curved shapes may be preferable because they are easier to form by printing than by processing after film formation.
- the mounting surface may be provided with a hole through which the substrate is exposed, separately from the peripheral portion of the outer shape.
- the outer shape of the hole is not limited to a rectangular shape, and may be, for example, a curved shape, a circular shape, a polygonal shape, or the like. These contours are required when the other parts in the mounting surface are designed so that they do not come into contact with the connecting film.
- the shape of a mounted component having a mounting surface may or may not be the same as the mounting surface. This may be either the first electronic component or the second electronic component, or both (not shown).
- the film structure may have a non-attached portion extending from the periphery of the unit area toward the center of the unit area. As a result, it is possible to prevent the reliability of the connection from deteriorating due to filling of the recess with gas.
- the non-sticking portion may be formed in the direction from the center of at least one side of the unit area toward the center of the unit area. Thereby, it is possible to mount the first electronic component having a mounting surface on which terminal rows are formed on three sides (U-shaped) of the periphery of the recess.
- the non-sticking portion may be formed in the unit area from the center in the width direction of the base material to the length direction of the base material.
- polygonal shapes such as hexagons, octagons, and dodecagons, U-shapes, or curved U-shapes, C-shapes, and cylinders are formed by printing.
- a connecting film consisting of a shaped sticking portion.
- the joining portion of the connecting film may have a shape in which straight lines and curved lines are mixed. As mentioned above, when taking a complicated shape, it may be segmented rather than continuous. It can be confirmed that the parted part has substantially the same characteristics as the slit end part. Having printed edges and slit edges distinguishes them from those formed by printing alone.
- the sticking portion has the same shape as the shape of the mounting surface of the first electronic component or the second electronic component. That is, the attachment portion of the connecting film may have a rectangular shape, a curved shape, a circular shape, a polygonal shape, etc. according to the shape of the mounting surface. It may be a U-shaped shape, a U-shaped shape, a C-shaped shape, or the like.
- the first electronic component and the second electronic component are not particularly limited and can be appropriately selected according to the purpose.
- the first electronic component include ceramic substrates, rigid substrates, flexible printed circuits (FPC), glass substrates, plastic substrates, resin multilayer substrates, IC (Integrated Circuit) modules, and IC chips.
- the second electronic component include ceramic substrates, rigid substrates, flexible printed circuits (FPC), glass substrates, plastic substrates, and resin multilayer substrates.
- a functional module such as a camera module may use a ceramic substrate from the viewpoint of excellent electrical insulation and thermal insulation.
- a ceramic substrate has advantages such as excellent dimensional stability in miniaturization (for example, 1 cm 2 or less).
- the connecting film is not particularly limited, and includes a film-like anisotropic conductive film (ACF: Anisotropic Conductive Film), a film-like adhesive film (NCF: Non Conductive Film), and the like.
- ACF Anisotropic Conductive Film
- NCF Non Conductive Film
- the curing type of the connecting film is not particularly limited, and examples thereof include a thermosetting type, a photo-curing type, and a combined photo-heat curing type.
- the connection film may be of a hot-melt type using a thermoplastic resin.
- the present technology is applicable to, for example, semiconductor devices (including driver ICs as well as optical elements, thermoelectric conversion elements, photoelectric conversion elements, and other devices that use semiconductors), display devices (monitors, televisions, head-mounted displays, etc.), Mobile devices (tablet terminals, smartphones, wearable devices, etc.), game consoles, audio equipment, imaging devices (using image sensors such as camera modules), electrical mounting for vehicles (mobile devices), medical equipment, sensor devices (touch sensors) , fingerprint authentication, iris authentication, etc.), and can be used in manufacturing methods for all electronic devices that use electrical connections, such as home appliances.
- a manufacturing method of a connection structure shown as a specific example includes a bonding process of bonding a connecting film to a camera module, a mounting process of mounting a flexible substrate on the camera module, and a terminal of the camera module and a terminal of the flexible substrate via the connecting film. and a connecting step of connecting the
- the camera module] 12 is a plan view showing the mounting surface of the camera module
- FIG. 13 is a cross-sectional view taken along line II-II shown in FIG.
- the camera module 10 includes a ceramic substrate 11 having a concave portion (cavity) on a rectangular mounting surface, and second cavities formed on two opposite sides of the concave portion on the rectangular mounting surface. It includes one terminal row 12, a second terminal row 13, and an image sensor 14 housed in a recess.
- the camera module 10 has a mounting surface with a predetermined width of 12W on which the first terminal row 12 is formed and a mounting surface with a predetermined width of 13W on which the second terminal row 13 is formed in the cross section taken along the cutting line II-II. have.
- [Film structure] 14 is a plan view showing a unit area of the film structure
- FIG. 15 is a cross-sectional view along section line IV-IV shown in FIG.
- the film structure includes a tape-shaped base material 21 and connection films 22 and 23 formed on the base material 21. has a rectangular unit area with a predetermined length 21L and a predetermined width 21W in the width direction of the substrate 21 .
- the film structure 20 has a gap 24, which is a non-attached portion, extending from the widthwise central portion of the substrate 21 to the lengthwise direction of the substrate 21 .
- the voids 24 can be formed, for example, by masking in the length direction of the base material 21 from the central portion in the width direction of the base material 21 in screen printing. That is, in the film structure 20, the non-attached portion is formed in the unit area from the center portion in the width direction of the base material to the length direction of the base material.
- a connection film 22 having a predetermined width of 22W and a connection film 23 having a predetermined width of 23W are formed apart from each other in the longitudinal direction of the substrate 21 corresponding to the two terminal rows 13 .
- the width 22W of the connection film 22 and the width 23W of the connection film 23 are equal to or smaller than the width 12W of the mounting surface of the first terminal row 12 and the width 13W of the mounting surface of the second terminal row 13, respectively. But it can be wide.
- the width of the connecting film is narrower than the width of the mounting surface of the terminal row, it is possible to suppress excessive protrusion of the resin of the connecting film from the film connecting body. As a result, it is possible to prevent the excessively protruding resin from coming into contact with the camera module and other mounted parts, and the workability of the assembly can be improved.
- FIG. 16 is a cross-sectional view showing a sticking process of sticking the connecting film to the camera module
- FIG. 17 is a cross-sectional view showing a state in which the base material is peeled off from the connecting film in the sticking process.
- the connecting films 22 and 23 of the unit area of the film structure 20 are transferred to the camera module 10 .
- a bonding device is used to apply pressure from the substrate side of the film structure to collectively bond the connection films 22 and 23 of the unit area to the mounting surface of the camera module 10 on the stage.
- the film structure to which the connecting films 22 and 23 have been transferred is wound up as a base material alone.
- FIG. 18 is a cross-sectional view showing a mounting process for mounting the flexible substrate on the camera module.
- the flexible substrate 30 has a first terminal row 32 and a second terminal row on a base material 31 corresponding to the first terminal row 12 and the second terminal row 13 of the camera module 10 . It has columns 33 .
- the first terminal row 32 and the second terminal row 33 of the flexible substrate 30 and the first terminal row 12 and the second terminal row 13 of the camera module 10 are aligned, and the camera module 10 is mounted.
- a flexible substrate 30 is mounted.
- FIG. 19 is a cross-sectional view showing a connecting step of connecting the terminals of the camera module and the terminals of the flexible substrate via the connecting film.
- the connecting step for example, the first terminal row 12 of the camera module 10 and the first terminal row 32 of the flexible substrate 31 are pressed with a crimping tool 42 via a cushioning material 41 .
- the second terminal row 13 of the camera module 10 and the second terminal row 33 of the flexible substrate 30 are pressed by the crimping tool 43 .
- heating, light irradiation, or the like is performed to cure the connecting film.
- FIG. 20 is a cross-sectional view showing a connection structure on which a camera module is mounted.
- the connection structure mounting the camera module 10 has a cured film 22A in which the first terminal row 12 of the camera module 10 and the first terminal row 32 of the flexible substrate 30 are cured from the connection film 22.
- the second terminal row 13 of the camera module 10 and the second terminal row 33 of the flexible substrate 30 are connected by a cured film 23A obtained by curing the connection film 23 .
- the cured film 23 is a cured film connected by the hot-melt type connecting film.
- FIG. 21 is a cross-sectional view showing a configuration example of a connection structure on which a camera module is mounted. Components similar to those shown in FIGS. 12 to 20 are denoted by the same reference numerals, and description thereof is omitted.
- the connection structure includes a camera module 10 having a first terminal row 12 and a second terminal row 13, and a flexible module having a first terminal row 32 and a second terminal row 33. between the substrate 30 and the first terminal row 12 and the first terminal row 32; , and a cured film 23A obtained by curing the connection film 23 .
- the connecting structure also has a protective glass 15 fixed on the ceramic substrate 11 and a lens 16 placed on the image sensor 14 and installed in the housing.
- the camera module driving IC 17 may be mounted on the flexible substrate 30 in addition to the camera module mounting portion.
- connection structure having such a configuration, it is difficult to optically shorten the distance T2 between the image sensor 14 and the lens 16, but the distance T1 between the lens 16 and the flexible substrate 30 can be shortened and thinned.
- the connection structure In the rectangular mounting surface of the connection structure, two opposite sides of the recess peripheral edge of the ceramic substrate 11 are fixed with the cured film 22A and the cured film 23A, and a part of the other two sides are not fixed. Therefore, it is possible to prevent the concave portion of the ceramic substrate 11 from being blocked by the base material 31 of the flexible substrate 30 and the flexible substrate 30 from expanding under the influence of the gas.
- anisotropic conductive paste 5 parts by mass of resin core conductive particles (Ni (base)/Au (surface) plating, resin core) with an average particle size of 20 ⁇ m and 95 parts by mass of an insulating binder were mixed with a planetary stirrer (product name: Awatori Rentaro, (manufactured by THINKY) and stirred for 1 minute to prepare an anisotropic conductive paste.
- the insulating binder is 47 parts by mass of phenoxy resin (trade name: YP-50, manufactured by Shinnikka Epoxy Manufacturing Co., Ltd.), 3 parts by mass of monofunctional monomer (trade name: M-5300, manufactured by Toagosei Co., Ltd.), urethane Resin (trade name: UR-1400, manufactured by Toyobo Co., Ltd.) 25 parts by mass, rubber component (trade name: SG80H, manufactured by Nagase ChemteX Corporation) 15 parts by mass, silane coupling agent (trade name: A-187, 2 parts by mass of Momentive Performance Materials Japan) and 3 parts by mass of organic peroxide (trade name: Nyper BW, manufactured by NOF Corporation) so that the solid content is 50% by mass.
- a mixed solution of ethyl acetate and toluene was prepared.
- connection films 22 and 23 (22W, 23W: 1.2 mm) are The anisotropic conductive paste was applied onto the release-treated film by screen printing using a paste-passing portion, and dried to prepare an anisotropic conductive film in a piece shape. After bonding the piece-shaped anisotropic conductive film to the substrate for evaluation, the FPC for evaluation was mounted and thermocompression bonded (temperature: 140°C, pressure: 1 MPa, time: 6 sec) to produce a connection structure. bottom.
- connection structure when impressions of the conductive particles on the terminal were observed with a microscope from the FPC side, the number of trapped conductive particles on the terminal (connection area: 200000 ⁇ m 2 ) was 25.5. In addition, the productivity of the piece-shaped anisotropic conductive film was good. A linear anisotropic conductive film having a width of about 100 ⁇ m was also produced.
- the anisotropic conductive paste was applied to the entire surface of the release treated film with a coater and dried to form an anisotropic conductive film.
- the shape of the anisotropic conductive film matched to the mounting surface of the evaluation substrate (connecting film 22, 23 portions (22W, 23W: 1.2 mm) in the unit area (21W, 21L: 6.0 mm) shown in FIGS. )), and then unnecessary portions were removed to produce anisotropic conductive films of individual piece shape.
- the FPC for evaluation was mounted and thermocompression bonded (temperature: 140°C, pressure: 1 MPa, time: 6 sec) to produce a connection structure. bottom.
- connection structure when impressions of the conductive particles on the terminal were observed with a microscope from the FPC side, the number of trapped conductive particles on the terminal (connection area: 200000 ⁇ m 2 ) was 26.1.
- the production of the piece-shaped anisotropic conductive film requires more processes and more material loss than in the examples because it is necessary to remove unnecessary parts. productivity was poor.
- a linear anisotropic conductive film having a width of about 100 ⁇ m was produced, the necessary portions were also peeled off from the release treated film when the unnecessary portions were removed.
- connection films 22 and 23 (22W, 23W: 1.2 mm) are The anisotropic conductive paste was applied onto the substrate for evaluation by screen printing using the paste passing portion. An FPC for evaluation was mounted on this, and thermocompression bonding was performed (temperature: 140° C., pressure: 1 MPa, time: 6 sec) to produce a connection structure.
- connection structure when impressions of the conductive particles on the terminal were observed with a microscope from the FPC side, the number of trapped conductive particles on the terminal (connection area: 200000 ⁇ m 2 ) was 15.2. This is probably because the conductive particles entered between the wirings during coating, the particle density became uneven, and the number of particles existing on the terminal decreased.
- Table 1 shows the evaluation results of Example 1, Comparative Example 1, and Reference Example 1.
- Second embodiment> In a second example, a striped anisotropic conductive film having a width smaller than the slit width was produced using a slitter, and the shape of the anisotropic conductive film was evaluated. The same anisotropic conductive paste as in the first example was used, and the slitter used had a lower limit of slit width of 0.4 mm.
- the striped anisotropic conductive film was observed with a microscope and evaluated according to the following indices.
- floating refers to a state in which the anisotropic conductive film is separated from the release film
- wrinkleles refers to a state in which lines due to curling or the like are observed on the anisotropic conductive film.
- C A striped anisotropic conductive film cannot be produced.
- Example 11 Using a screen mask having a plurality of striped openings with a line width of 0.1 mm, an anisotropic conductive paste is applied to the release treated film by screen printing, dried, and a line width of 0 is applied on the release treated film.
- a stripe-shaped anisotropic conductive film was formed in which a plurality of rectangles each having a length of 1 mm, a length of 150 mm, and a thickness of 25 ⁇ m were arranged.
- FIG. 22 is a plan view for explaining the production of an anisotropic conductive film in Examples.
- Example 11 on both sides of the line width (a + a) of 0.1 mm in the width direction, the width b of the release treatment film portion that becomes the gap is secured to 0.35 mm, and the stripe-shaped anisotropic A conductive film was formed.
- an anisotropic conductive film having a width a of 0.05 mm and a length of 150 mm was produced by slitting S1 to S5 in the central portion of the line width (a+a) and the gap width (b+b) with a slit width of 0.4 mm.
- This anisotropic conductive film was produced five times.
- Some of the anisotropic conductive films were found to float, but an anisotropic conductive film with a width of 0.05 mm could be produced by one slitting process (evaluation B).
- Example 12 Using a screen mask having a plurality of striped openings with a line width of 0.2 mm, an anisotropic conductive paste is applied onto the release treated film by screen printing, dried, and a line width of 0 is applied on the release treated film.
- Example 12 As shown in FIG. 22, in Example 12, on both sides of the line width (a + a) of 0.2 mm in the width direction, the width b of the release treatment film portion that becomes a gap is secured to 0.3 mm, and the stripe-shaped anisotropic A conductive film was formed. Then, an anisotropic conductive film having a width a of 0.1 mm and a length of 150 mm was produced by slitting S1 to S5 in the central portion of the line width (a+a) and the gap width (b+b) with a slit width of 0.4 mm. This anisotropic conductive film was produced five times. An anisotropic conductive film with a width of 0.1 mm could be produced by a single slitting process without generating lift or wrinkles for all of the anisotropic conductive films (evaluation A).
- Example 13 Using a screen mask having a plurality of striped openings with a line width of 0.32 mm, an anisotropic conductive paste is applied onto the release treated film by screen printing, dried, and a line width of 0 is applied on the release treated film.
- Example 13 As shown in FIG. 22, in Example 13, on both sides of the line width (a + a) of 0.32 mm in the width direction, the width b of the release treatment film portion that becomes a gap is secured to 0.24 mm, and the stripe-shaped anisotropic A conductive film was formed. Then, an anisotropic conductive film having a width a of 0.16 mm and a length of 150 mm was produced by slitting S1 to S5 in the central portion of the line width (a+a) and the gap width (b+b) with a slit width of 0.4 mm. This anisotropic conductive film was produced five times. An anisotropic conductive film with a width of 0.16 mm could be produced by a single slitting process without generating lift or wrinkles for all of the anisotropic conductive films (Evaluation A).
- Example 14 Using a screen mask having a plurality of striped openings with a line width of 0.4 mm, an anisotropic conductive paste is applied to the release treated film by screen printing, dried, and the line width is 0 on the release treated film.
- Example 14 on both sides of the line width (a + a) of 0.4 mm in the width direction, the width b of the release treatment film portion that becomes the gap is secured to 0.2 mm, and the stripe-shaped anisotropic A conductive film was formed. Then, an anisotropic conductive film having a width a of 0.2 mm and a length of 150 mm was produced by slitting S1 to S5 in the central portion of the line width (a+a) and gap width (b+b) with a slit width of 0.4 mm. This anisotropic conductive film was produced five times. An anisotropic conductive film with a width of 0.2 mm could be produced by a single slitting process without generating lift or wrinkles for all of the anisotropic conductive films (Evaluation A).
- Example 15 Using a screen mask having a plurality of striped openings with a line width of 0.48 mm, an anisotropic conductive paste is applied onto the release treated film by screen printing, dried, and a line width of 0 is applied on the release treated film.
- Example 15 on both sides of the line width (a + a) of 0.48 mm in the width direction, the width b of the release treatment film portion that becomes the gap is secured to 0.16 mm, and the stripe-shaped anisotropic A conductive film was formed. Then, an anisotropic conductive film having a width a of 0.24 mm and a length of 150 mm was produced by slitting S1 to S5 in the central portion of the line width (a+a) and the gap width (b+b) with a slit width of 0.4 mm. This anisotropic conductive film was produced five times. An anisotropic conductive film with a width of 0.24 mm could be produced by a single slitting process without generating lift or wrinkles for all of the anisotropic conductive films (evaluation A).
- Example 16 Using a screen mask having a plurality of striped openings with a line width of 0.6 mm, an anisotropic conductive paste is applied to the release treated film by screen printing, dried, and a line width of 0 is applied on the release treated film.
- Example 16 on both sides of the line width (a + a) of 0.6 mm in the width direction, the width b of the release treatment film portion that becomes a gap is secured to 0.1 mm, and the stripe-shaped anisotropic A conductive film was formed. Then, an anisotropic conductive film having a width a of 0.3 mm and a length of 150 mm was produced by slitting S1 to S5 in the central portion of the line width (a+a) and the gap width (b+b) with a slit width of 0.4 mm. This anisotropic conductive film was produced five times. Some of the anisotropic conductive films were lifted or wrinkled, but an anisotropic conductive film with a width of 0.3 mm could be produced by one slitting process (Evaluation B).
- FIG. 23 is a plan view for explaining production of an anisotropic conductive film in a conventional example.
- the anisotropic conductive paste was applied to the entire surface of the release treated film with a coater and dried to form an anisotropic conductive film. Then, as shown in FIG. 23, after performing half cuts H1 to H6 so that the width a is 0.1 mm, the center part of the line width (a + a) and the gap width (b + b) with a slit width of 0.4 mm was slit S1 to S5, and the anisotropic conductive film with a width a of 0.1 mm and a length of 150 mm was removed 5 times.
- Table 2 shows the evaluation results of Examples 11 to 16 and the conventional example.
- the ratio of the width a of the anisotropic conductive film to the slit width c is 0.125 or more and 0.75 or less, so that the slit width is smaller than the slit width in one slit process after printing.
- An anisotropic conductive film with a width could be produced.
- the ratio of the width a of the anisotropic conductive film to the slit width c was 0.25 or more and 0.6 or less, so that the occurrence of floating and wrinkles could be prevented.
- the anisotropic conductive film was produced and evaluated, but it is presumed that the same effect can be expected even if it is an adhesive film or a conductive film.
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Abstract
Description
1.接続フィルムの製造方法
2.フィルム巻装体
3.接続構造体の製造方法
4.実施例
本実施の形態に係る接続フィルムの製造方法は、離型処理フィルム上に接着剤を所定形状に印刷し、離型処理フィルム上に所定形状の接続フィルムを形成する。これにより、不要部分をカットする所定形状の接続フィルムを形成するのに比べて、材料ロスやプロセス数の増加を抑え、接続フィルムの良好な生産性を得ることができる。また、カットによる離型処理フィルムの強度の低下を防ぐことができる。
図1及び図2に示すように、離型処理フィルム1の幅方向に所定形状の接続フィルム4を複数形成することにより、長尺の離型処理フィルム1上に所定形状の接続フィルム4を効率良く製造することができる。すなわち、前述した接続フィルムの製造方法は、離型処理フィルム1を所定幅で長手方向に切断する切断工程と、所定幅の離型処理フィルム1を長手方向に複数連結する連結工程と、連結された所定幅の離型処理フィルム1を巻芯に巻装する巻装工程とをさらに有することが好ましい。これにより、フィルム巻装体を効率的に生産することができる。
また、離型処理フィルムの幅方向に空隙を設けて長手方向に矩形状の接続フィルムを形成し、離型処理フィルムを所定幅で長手方向に切断することにより、所定幅よりも小さい幅の導電フィルムを得ることができる。特に、従来のハーフカット加工などの方法では、スリットやハーフカットする刃の構造上、幅が0.5mm未満の接続フィルムを生産性と長尺化を加味して製造することは困難であったが、印刷とスリットを併用することにより、幅が0.5mm未満の接続フィルムを簡単に製造することができる。これは特に長尺で製造する際に有用である。
図11は、フィルム巻装体を模式的に示す斜視図である。図11に示すように、フィルム巻装体は、テープ状の基材21と、基材21上に形成された接続フィルム22、23とを備えるフィルム構造体を巻芯20に巻装してなる。巻芯20は、リールを回転させるための回転軸が挿入される軸穴を有し、フィルム構造体の長手方向の一方の端部を接続してフィルム構造体を巻回す。フィルム巻装体に巻装されるフィルム構造体の長さは、特に限定されることはないが、長さの下限は5m以上、10m以上、50m以上であり、長さの上限は5000m以下、500m以下、300m以下、100m以下のものを好適に用いることができる。例えば300mより長い場合には、連結して長尺化してもよい。
また、接着性の観点から、単官能(メタ)アクリルモノマーは、カルボン酸を有することが好ましい。また、カルボン酸を有する単官能(メタ)アクリルモノマーの分子量は、100~500であることが好ましく、200~350であることがより好ましい。また、カルボン酸を有する単官能(メタ)アクリルモノマーの絶縁性バインダーにおける含有量は、3質量%~20質量%であることが好ましく、5質量%~10質量%であることがより好ましい。
本実施の形態に係る接続構造体の製造方法は、テープ状の基材と、基材上に形成された接続フィルムとを備えるフィルム構造体から基材の長さ方向に所定長さ及び前記基材の幅方向に所定幅の単位領域を有する接続フィルムを、複数の端子列を有する第1の電子部品又は第2の電子部品に貼付する貼付工程と、接続フィルムを介して、第1の電子部品の端子と第2の電子部品の端子とを接続させる接続工程とを有し、フィルム構造体が、単位領域において前記複数の端子列の対応箇所以外に、接続フィルムが貼付されない非貼付部を有する。これにより、既存の実装設備を用いて、実装面に複数の端子列を有する電子部品を実装することができる。また、貼付工程では、複数の端子列に対応して接続フィルムを複数回貼付することなく、一括して接続フィルムを貼付することができる。
図12は、カメラモジュールの実装面を示す平面図であり、図13は、図12に示す切断線II-IIにおける断面図である。図12及び図13に示すように、カメラモジュール10は、矩形の実装面に凹部(キャビティ)を有するセラミック基板11と、矩形の実装面において、凹部周縁の対向する2辺にそれぞれ形成された第1の端子列12と、第2の端子列13と、凹部に収容されたイメージセンサ14とを備える。また、カメラモジュール10は、切断線II-IIにおける断面において、第1の端子列12が形成された所定幅12Wの実装面及び第2の端子列13が形成された所定幅13Wの実装面を有する。
図14は、フィルム構造体の単位領域を示す平面図であり、図15は、図14に示す切断線IV-IVにおける断面図である。図14及び図15に示すように、フィルム構造体は、テープ状の基材21と、基材21上に形成された接続フィルム22、23とを備え、平面視において基材21の長さ方向に所定長さ21L及び基材21の幅方向に所定幅21Wの矩形状の単位領域を有する。フィルム構造体20は、単位領域において、基材21の幅方向の中央部から基材21の長さ方向に非貼付部である空隙24を有する。空隙24は、例えば、スクリーン印刷において、基材21の幅方向の中央部から基材21の長さ方向にマスクすることにより形成することができる。すなわち、フィルム構造体20は、非貼付部が、単位領域において、基材の幅方向の中央部から基材の長さ方向に形成されてなり、セラミック基板11の第1の端子列12及び第2の端子列13に対応して基材21の長さ方向に所定幅22Wの接続フィルム22及び所定幅23Wの接続フィルム23が、離間して形成されてなる。
図16は、カメラモジュールに接続フィルムを貼付する貼付工程を示す断面図であり、図17は、貼付工程において、接続フィルムから基材が剥離された状態を示す断面図である。図16及び図17に示すように、貼付工程では、フィルム構造体20の単位領域の接続フィルム22、23をカメラモジュール10に転着させる。例えば、貼付装置を用いて、フィルム構造体の基材側から押圧し、ステージ上のカメラモジュール10の実装面に単位領域の接続フィルム22、23を一括して貼り付ける。接続フィルム22、23が転着されたフィルム構造体は、基材のみとなって巻き取られる。
図18は、カメラモジュールにフレキシブル基板を搭載する搭載工程を示す断面図である。図18に示すように、フレキシブル基板30は、カメラモジュール10の第1の端子列12及び第2の端子列13に対応して、基材31上に第1の端子列32及び第2の端子列33を有する。搭載工程では、フレキシブル基板30の第1の端子列32及び第2の端子列33と、カメラモジュール10の第1の端子列12及び第2の端子列13とを位置合わせし、カメラモジュール10にフレキシブル基板30を搭載する。
図19は、接続フィルムを介してカメラモジュールの端子とフレキシブル基板の端子とを接続する接続工程を示す断面図である。図19に示すように、接続工程では、例えば、緩衝材41を介して、カメラモジュール10の第1の端子列12及びフレキシブル基板31の第1の端子列32上を圧着ツール42で押圧するとともに、カメラモジュール10の第2の端子列13及びフレキシブル基板30の第2の端子列33上を圧着ツール43で押圧する。また、接続フィルムの硬化型に応じて、加熱、光照射などを行い、接続フィルムを硬化させる。
図20は、カメラモジュールを実装した接続構造体を示す断面図である。図20に示すように、カメラモジュール10を実装した接続構造体は、カメラモジュール10の第1の端子列12及びフレキシブル基板30の第1の端子列32が、接続フィルム22が硬化した硬化膜22Aによって接続されてなる。また、カメラモジュール10の第2の端子列13及びフレキシブル基板30の第2の端子列33が、接続フィルム23が硬化した硬化膜23Aによって接続されてなる。なお、ホットメルト型の接続フィルムの場合には、硬化膜23は、ホットメルト型の接続フィルムにより接続された硬化膜である。
以下、本技術の第1の実施例について説明する。下記異方性導電ペースト、評価用基板、及び評価用FPCを準備した。
平均粒径20μmの樹脂コア導電粒子(Ni(下地)/Au(表面)メッキ、樹脂コア)5質量部と、絶縁性バインダー95質量部とを遊星式撹拌装置(製品名:あわとり錬太郎、THINKY社製)に投入し、1分間撹拌して異方性導電ペーストを作製した。
アルミナ製セラミック基板、基板厚み:0.4mm、幅:6.0mm、端子列の実装面:1.0mm×6.0mm、タングステン配線、ライン:スペース=100μm/100μm、端子高さ10μm、ライン:スペース=100μm/100μm、キャビティ構造有、端子列は対向する2辺に存在
銅配線、ライン:スペース=100μm/100μm、端子高さ12μm、ポリイミドフィルム厚み:25μm
評価用基板の実装面に合わせた形状のスクリーンマスク(図14及び図15に示す単位領域(21W,21L:6.0mm)において、接続フィルム22,23部分(22W,23W:1.2mm)をペーストの通過部分とした)を用いたスクリーン印刷で、異方性導電ペーストを離型処理フィルム上へ塗布し、乾燥させて、個片形状型の異方性導電フィルムを作製した。個片形状型の異方性導電フィルムを評価用基板に貼り合わせた後、評価用FPCを搭載して熱圧着(温度:140℃、圧力:1MPa、時間:6sec)し、接続構造体を作製した。
異方性導電ペーストをコーターで離型処理フィルム上に全面に塗布し、乾燥させて異方性導電フィルムを形成した。異方性導電フィルムを評価用基板の実装面に合わせた形状(図14及び図15に示す単位領域(21W,21L:6.0mm)における接続フィルム22,23部分(22W,23W:1.2mm))に沿ってハーフカットした後、不要な部分を取り除くことで、個片形状型の異方性導電フィルムを作製した。個片形状型の異方性導電フィルムを評価用基板に貼り合わせた後、評価用FPCを搭載して熱圧着(温度:140℃、圧力:1MPa、時間:6sec)し、接続構造体を作製した。
評価用基板の実装面に合わせた形状のスクリーンマスク(図14及び図15に示す単位領域(21W,21L:6.0mm)において、接続フィルム22,23部分(22W,23W:1.2mm)をペーストの通過部分とした)を用いたスクリーン印刷で、異方性導電ペーストを評価用基板上に塗布した。これに評価用FPCを搭載して熱圧着(温度:140℃、圧力:1MPa、時間:6sec)し、接続構造体を作製した。
第2の実施例では、スリッターを用いてスリット幅よりも小さい幅のストライプ状の異方性導電フィルムを作製し、異方性導電フィルムの形状について評価した。異方性導電ペーストは、第1の実施例と同様なものを使用し、スリッターは、スリット幅の下限値が0.4mmのものを使用した。
ストライプ状の異方性導電フィルムを顕微鏡で観察し、下記指標にて評価を行った。ここで、「浮き」は異方性導電フィルムが剥離フィルムから離れている状態をいい、「しわ」は異方性導電フィルムに捲れなどによる線が観察される状態をいう。
A:全ての異方性導電フィルムについて、浮き及びしわが発見できない。
B:一部の異方性導電フィルムについて、浮き又はしわのどちらか一方が発見できる。
C:ストライプ状の異方性導電フィルムの作製ができない。
線幅0.1mmのストライプ状の複数の開口を有するスクリーンマスクを用い、異方性導電ペーストをスクリーン印刷で離型処理フィルム上へ塗布し、乾燥させ、離型処理フィルム上に、線幅0.1mm、長さ150mm、厚み25μmの複数の矩形が並んだストライプ状の異方性導電フィルムを形成した。
線幅0.2mmのストライプ状の複数の開口を有するスクリーンマスクを用い、異方性導電ペーストをスクリーン印刷で離型処理フィルム上へ塗布し、乾燥させ、離型処理フィルム上に、線幅0.2mm、長さ150mm、厚み25μmの複数の矩形が並んだストライプ状の異方性導電フィルムを形成した。
線幅0.32mmのストライプ状の複数の開口を有するスクリーンマスクを用い、異方性導電ペーストをスクリーン印刷で離型処理フィルム上へ塗布し、乾燥させ、離型処理フィルム上に、線幅0.32mm、長さ150mm、厚み25μmの複数の矩形が並んだストライプ状の異方性導電フィルムを形成した。
線幅0.4mmのストライプ状の複数の開口を有するスクリーンマスクを用い、異方性導電ペーストをスクリーン印刷で離型処理フィルム上へ塗布し、乾燥させ、離型処理フィルム上に、線幅0.4mm、長さ150mm、厚み25μmの複数の矩形が並んだストライプ状の異方性導電フィルムを形成した。
線幅0.48mmのストライプ状の複数の開口を有するスクリーンマスクを用い、異方性導電ペーストをスクリーン印刷で離型処理フィルム上へ塗布し、乾燥させ、離型処理フィルム上に、線幅0.48mm、長さ150mm、厚み25μmの複数の矩形が並んだストライプ状の異方性導電フィルムを形成した。
線幅0.6mmのストライプ状の複数の開口を有するスクリーンマスクを用い、異方性導電ペーストをスクリーン印刷で離型処理フィルム上へ塗布し、乾燥させ、離型処理フィルム上に、線幅0.6mm、長さ150mm、厚み25μmの複数の矩形が並んだストライプ状の異方性導電フィルムを形成した。
図23は、従来例における異方性導電フィルムの作製を説明するための平面図である。異方性導電ペーストをコーターで離型処理フィルム上に全面に塗布し、乾燥させて異方性導電フィルムを形成した。そして、図23に示すように、幅aが0.1mmとなるようにハーフカットH1~H6を行った後、スリット幅0.4mmで、線幅(a+a)及び空隙幅(b+b)の中央部をスリットS1~S5し、幅bの0.3mmの異方性導電フィルムを取り除くことで、幅a0.1mm、長さ150mmの異方性導電フィルムの作製を5回試みた。その結果、実施例のように1回のスリットプロセスで作製することができない上に、不要部を取り除く際に浮きが発生し、ストライプ状の異方性導電フィルムの作製ができなかった(評価C)。
Claims (15)
- 離型処理フィルム上に接着剤を所定形状に印刷し、前記離型処理フィルム上に所定形状の接続フィルムを形成する接続フィルムの製造方法。
- 前記離型処理フィルムの幅方向に前記所定形状の接続フィルムを複数形成し、前記離型処理フィルムを所定幅で長手方向に切断し、前記所定幅の離型処理フィルムを長手方向に複数連結し、該連結された所定幅の離型処理フィルムを巻芯に巻装する請求項1記載の接続フィルムの製造方法。
- 前記離型処理フィルムを所定幅で長手方向に切断する際に、前記所定形状の接続フィルムを切断する請求項2記載の接続フィルムの製造方法。
- 前記離型処理フィルムを所定幅で長手方向に切断する際に、前記所定形状の接続フィルムを切断しない請求項2記載の接続フィルムの製造方法。
- 前記接着剤が、導電粒子を含み、
前記離型処理フィルム上に所定形状の導電フィルムを形成する請求項1乃至4のいずれか1項に記載の接続フィルムの製造方法。 - 前記接着剤が、導電粒子を含み、
前記離型処理フィルム上に所定形状の異方性導電フィルムを形成する請求項1乃至4のいずれか1項に記載の接続フィルムの製造方法。 - 前記所定形状の接続フィルムの所定位置に導電粒子を配置し、
前記離型処理フィルム上に所定形状の異方性導電フィルムを形成する請求項1乃至4のいずれか1項に記載の接続フィルムの製造方法。 - 前記印刷が、スクリーン印刷又はインクジェット印刷である請求項1乃至4のいずれか1項に記載の接続フィルムの製造方法。
- 前記離型処理フィルムの幅方向に空隙を設けて長手方向に矩形状の接続フィルムを形成し、前記離型処理フィルムを所定幅で長手方向に切断する請求項1記載の接続フィルムの製造方法。
- 前記所定幅の一端が前記空隙、他端が前記接続フィルムとなるように長手方向に切断する請求項9記載の接続フィルムの製造方法。
- 前記所定幅に対する前記接続フィルムの幅が、0.125以上0.75以下となるように切断する請求項10記載の接続フィルムの製造方法。
- 前記所定幅が0.5mm未満である請求項9乃至11のいずれか1項に記載の接続フィルムの製造方法。
- 前記請求項1乃至12のいずれか1項に記載の製造方法により製造された接続フィルム。
- 第1の端子を有する第1の電子部品と、
第2の端子を有する第2の電子部品と、
前記請求項1乃至12のいずれか1項に記載の製造方法により製造された接続フィルムが硬化した硬化膜とを備え、
前記第1の端子と前記第2の端子とが、前記硬化膜により接続される接続構造体。 - 前記請求項1乃至12のいずれか1項に記載の製造方法により製造された接続フィルムを介して、第1の電子部品の端子と第2の電子部品の端子とを接続する接続構造体の製造方法。
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JPH03285977A (ja) * | 1990-04-02 | 1991-12-17 | Three Bond Co Ltd | 異方導電性フィルム状接着剤 |
JP2002519473A (ja) * | 1998-06-30 | 2002-07-02 | ミネソタ マイニング アンド マニュファクチャリング カンパニー | ファインピッチの異方導電性接着剤 |
US20050276918A1 (en) * | 2004-07-07 | 2005-12-15 | Xerox Corporation | Adhesive film exhibiting anisotropic electrical conductivity |
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JP2020198422A (ja) | 2019-03-08 | 2020-12-10 | デクセリアルズ株式会社 | 接続構造体の製造方法、及び接続構造体、並びにフィルム構造体、及びフィルム構造体の製造方法 |
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JPH03285977A (ja) * | 1990-04-02 | 1991-12-17 | Three Bond Co Ltd | 異方導電性フィルム状接着剤 |
JP2002519473A (ja) * | 1998-06-30 | 2002-07-02 | ミネソタ マイニング アンド マニュファクチャリング カンパニー | ファインピッチの異方導電性接着剤 |
US20050276918A1 (en) * | 2004-07-07 | 2005-12-15 | Xerox Corporation | Adhesive film exhibiting anisotropic electrical conductivity |
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