Classifications

• • 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
  • H05K13/00—Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
  • H05K13/04—Mounting of components, e.g. of leadless components
  • H05K13/046—Surface mounting
  • H05K13/0469—Surface mounting by applying a glue or viscous material
• • 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 resistors
• • 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 resistors
  • H05K3/32—Assembling printed circuits with electric components, e.g. with resistors electrically connecting electric components or wires to printed circuits
  • H05K3/321—Assembling printed circuits with electric components, e.g. with resistors electrically connecting electric components or wires to printed circuits by conductive adhesives
  • H05K3/323—Assembling printed circuits with electric components, e.g. with resistors electrically connecting electric components or wires to printed circuits by conductive adhesives by applying an anisotropic conductive adhesive layer over an array of pads
• • 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
  • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
  • H05K2201/09—Shape and layout
  • H05K2201/09818—Shape or layout details not covered by a single group of H05K2201/09009 - H05K2201/09809
  • H05K2201/0989—Coating free areas, e.g. areas other than pads or lands free of solder resist
• • 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
  • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
  • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
  • H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
  • H05K2201/10621—Components characterised by their electrical contacts
  • H05K2201/10674—Flip chip
• • 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
  • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
  • H05K2203/11—Treatments characterised by their effect, e.g. heating, cooling, roughening
  • H05K2203/1105—Heating or thermal processing not related to soldering, firing, curing or laminating, e.g. for shaping the substrate or during finish plating
• • 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
  • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
  • H05K2203/11—Treatments characterised by their effect, e.g. heating, cooling, roughening
  • H05K2203/1178—Means for venting or for letting gases escape
• • 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 resistors
  • H05K3/32—Assembling printed circuits with electric components, e.g. with resistors electrically connecting electric components or wires to printed circuits
  • H05K3/34—Assembling printed circuits with electric components, e.g. with resistors electrically connecting electric components or wires to printed circuits by soldering
  • H05K3/3452—Solder masks
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
  • H10W72/00—Interconnections or connectors in packages
  • H10W72/071—Connecting or disconnecting
  • H10W72/073—Connecting or disconnecting of die-attach connectors
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
  • H10W72/00—Interconnections or connectors in packages
  • H10W72/071—Connecting or disconnecting
  • H10W72/073—Connecting or disconnecting of die-attach connectors
  • H10W72/07331—Connecting techniques
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
  • H10W72/00—Interconnections or connectors in packages
  • H10W72/20—Bump connectors, e.g. solder bumps or copper pillars; Dummy bumps; Thermal bumps
  • H10W72/251—Materials
  • H10W72/252—Materials comprising solid metals or solid metalloids, e.g. PbSn, Ag or Cu
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
  • H10W72/00—Interconnections or connectors in packages
  • H10W72/30—Die-attach connectors
  • H10W72/321—Structures or relative sizes of die-attach connectors
  • H10W72/325—Die-attach connectors having a filler embedded in a matrix
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
  • H10W72/00—Interconnections or connectors in packages
  • H10W72/30—Die-attach connectors
  • H10W72/351—Materials of die-attach connectors
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
  • H10W72/00—Interconnections or connectors in packages
  • H10W72/30—Die-attach connectors
  • H10W72/351—Materials of die-attach connectors
  • H10W72/352—Materials of die-attach connectors comprising metals or metalloids, e.g. solders
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
  • H10W72/00—Interconnections or connectors in packages
  • H10W72/30—Die-attach connectors
  • H10W72/351—Materials of die-attach connectors
  • H10W72/353—Materials of die-attach connectors not comprising solid metals or solid metalloids, e.g. ceramics
  • H10W72/354—Materials of die-attach connectors not comprising solid metals or solid metalloids, e.g. ceramics comprising polymers
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
  • H10W72/00—Interconnections or connectors in packages
  • H10W72/30—Die-attach connectors
  • H10W72/381—Auxiliary members
  • H10W72/387—Flow barriers
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
  • H10W74/00—Encapsulations, e.g. protective coatings
  • H10W74/10—Encapsulations, e.g. protective coatings characterised by their shape or disposition
  • H10W74/15—Encapsulations, e.g. protective coatings characterised by their shape or disposition on active surfaces of flip-chip devices, e.g. underfills
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
  • H10W90/00—Package configurations
  • H10W90/701—Package configurations characterised by the relative positions of pads or connectors relative to package parts
  • H10W90/721—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bump connectors
  • H10W90/724—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bump connectors between a chip and a stacked insulating package substrate, interposer or RDL
• • H—ELECTRICITY
  • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
  • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
  • H10W90/00—Package configurations
  • H10W90/701—Package configurations characterised by the relative positions of pads or connectors relative to package parts
  • H10W90/731—Package configurations characterised by the relative positions of pads or connectors relative to package parts of die-attach connectors
  • H10W90/734—Package configurations characterised by the relative positions of pads or connectors relative to package parts of die-attach connectors between a chip and a stacked insulating package substrate, interposer or RDL
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49002—Electrical device making
  • Y10T29/49117—Conductor or circuit manufacturing
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49002—Electrical device making
  • Y10T29/49117—Conductor or circuit manufacturing
  • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
  • Y10T29/4913—Assembling to base an electrical component, e.g., capacitor, etc.
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49002—Electrical device making
  • Y10T29/49117—Conductor or circuit manufacturing
  • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
  • Y10T29/4913—Assembling to base an electrical component, e.g., capacitor, etc.
  • Y10T29/49133—Assembling to base an electrical component, e.g., capacitor, etc. with component orienting
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49002—Electrical device making
  • Y10T29/49117—Conductor or circuit manufacturing
  • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
  • Y10T29/4913—Assembling to base an electrical component, e.g., capacitor, etc.
  • Y10T29/49144—Assembling to base an electrical component, e.g., capacitor, etc. by metal fusion
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49002—Electrical device making
  • Y10T29/49117—Conductor or circuit manufacturing
  • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
  • Y10T29/49155—Manufacturing circuit on or in base

Definitions

• a general COF (chip on film) mounting method uses a wiring pattern 11 corresponding to a terminal of an electronic component and a wiring pattern 11 surrounding an electronic component mounting area.
• An anisotropic conductive film 14 is attached on a flexible substrate 13 on which a solder resist 12 formed so as to cover is formed, and an anisotropic conductive film 14 is attached as shown in FIG. 1B.
• the electronic component 16 having the bumps 15 is positioned and arranged thereon, and thermocompression bonding is performed.
• an electronic component mounting module as shown in FIG. 1C is obtained.
• the anisotropic conductive film 14 and the flexible substrate 1 are caused by unevenness of the wiring pattern 11 and the solder resist 12. Air may remain between 3 and.
• the air trapped between the anisotropic conductive film 14 and the flexible substrate 13 expands due to the heat and pressure applied during mounting, and the void 17 Or, in the worst case, the rupture of the poiy may destroy the anisotropic conductive film 14 and cause the exposure 18 of the wiring pattern to occur.
• a void 17 and an exposure 18 of the wiring pattern cause a reduction in the reliability of the electronic component mounting module.
• Patent Document 1 Japanese Patent Application Laid-Open No. 5-344384, etc.
• Patent Document 1 Japanese Patent Application Laid-Open No. 5-344384, etc.
• the thickness of the flexible circuit board is limited to a connection area. Drill holes that allow ventilation in the direction.
• the connection method of Patent Document 1 for example, air bubbles (air) remaining on the contact surface between the inflexible circuit board and the flexible circuit board expand due to heating.
• no air bubbles remain in that area, and the air bubbles are easily radiated and released through the air-permeable holes in the connected area of the flexible circuit board.
• Patent Document 1 has a problem in that an extra step of previously drilling or processing a hole in the flexible substrate is required, and the mounting operation is complicated. For this reason, there is a demand for the development of a technique for solving the above-mentioned problem by means different from the method described in Patent Document 1.
• DISCLOSURE OF THE INVENTION The present invention has been proposed in view of such a conventional situation, and has as its object to provide an electronic component mounting method capable of improving reliability without complicating the mounting operation. Aim.
• a method for mounting an electronic component is a method for mounting an electronic component on a printed circuit board provided with a wiring pattern via an adhesive sheet.
• the method is characterized in that the adhesive sheet is attached to a region of the printed circuit board where the electronic component is to be mounted, while heating air interposed between the adhesive sheet and the printed circuit board.
• FIG. 1A shows a conventional electronic component mounting method, and is a cross-sectional view showing a step of attaching an anisotropic conductive film.
• FIG. 1B shows a conventional electronic component mounting method, and is a cross-sectional view showing an electronic component mounting process.
• FIG. 1C shows a conventional electronic component mounting method, and is a schematic plan view of an electronic component mounting module.
• FIG. 2A is a schematic plan view showing an example of an electronic component mounting module manufactured according to the present invention.
• FIG. 2B is a schematic sectional view taken along line AA ′ in FIG. 2A.
• FIG. 3A is a view showing a step of a method for mounting an electronic component of the present invention, and is a schematic cross-sectional view showing a flexible substrate manufacturing step.
• FIG. 3B is a view showing a step of the electronic component mounting method of the present invention, and is a schematic sectional view showing a step of heating air between the flexible substrate and the anisotropic conductive film.
• FIG. 3C is a diagram showing a step of the electronic component mounting method of the present invention, and is a schematic cross-sectional view showing a step of attaching an anisotropic conductive film.
• FIG. 3D is a diagram showing a step of the electronic component mounting method of the present invention, and is a schematic cross-sectional view showing a step of cooling the flexible substrate.
• FIG. 3E is a diagram showing a step of the electronic component mounting method according to the present invention, and is a schematic cross-sectional view showing the step of mounting the electronic component.
• FIG. 4 is a chart showing appearance states and void ratios in notations A to F. BEST MODE FOR CARRYING OUT THE INVENTION
• a method for mounting an electronic component according to the present invention will be described with reference to the drawings.
• the electronic component mounting module manufactured by the present invention For example, a plurality of wiring patterns 2 on a flexible substrate 1, which is a printed circuit board, and bumps 4 of an electronic component 3 are press-bonded through an anisotropic conductive film 5 which is an adhesive sheet. It is configured by the so-called C ⁇ F (Chip on film) mounting method, in which electronic components 3 are mounted on 1.
• C ⁇ F Chip on film
• a solder register 6 for maintaining the mutual insulation of the wiring patterns 2 and protecting the wiring patterns 2 is provided so that the wiring patterns 2 at the connection portions with the electronic components 3 are exposed. Cover wiring pattern 2. Further, the solder resist 6 has an opening surrounding the region where the electronic component 3 is mounted.
• the anisotropic conductive film 5 is, for example, an anisotropic conductive film in which an adhesive in which conductive particles are dispersed is formed in a film shape. Secure connection.
• the anisotropic conductive film 5 has external dimensions so as to overlap the inner peripheral edge of the solder resist 6, and is attached on the solder resist 6 so as to cover the mounting area of the electronic component 3.
• the adhesive sheet is not limited to the anisotropic conductive film 5, but may be a mere adhesive sheet that does not include conductive particles.
• any of the components used in this type of electronic component mounting module can be used.
• the flexible substrate for example, a flexible insulating substrate such as polyimide or the like can be used.
• the wiring pattern 2 on the flexible substrate 1 is made of a conductor such as copper, for example, and is formed in a plurality corresponding to the bumps 4 of the electronic component 3.
• the printed circuit board is not limited to the flexible board 1, but can be applied to all wiring boards such as a so-called rigid board.
• the electronic component 3 is, for example, an IC chip such as a semiconductor bare chip, and has bumps 4 made of gold or the like as terminals on the surface.
• thermosetting resins include epoxy resin, melamine resin, phenolic resin, diaryl phthalate resin, bismaleimide triazine resin, polyester resin, polyurethane resin, phenoxy resin, and polyamide resin.
• a synthetic resin such as a polyimide resin, a rubber or an elastomer containing a functional group such as a hydroxyl group, a propyloxyl group, a vinyl group, an amino group, or an epoxy group can be used.
• epoxy resins can be preferably used in view of various characteristics.
• a bisphenol type epoxy resin an epoxy novolak resin or an epoxy compound having two or more oxysilane groups in a molecule can be used. It is preferable to use a high-purity epoxy resin having an impurity ion, in particular, a chloride ion of 50 ppm or less.
• Examples of the conductive particles used in the anisotropic conductive film 5 include a metal powder made of Ni, Ag, Cu or an alloy thereof, and a conductive coating in which the surface of spherical resin particles is coated with a conductive material.
• a metal powder made of Ni, Ag, Cu or an alloy thereof and a conductive coating in which the surface of spherical resin particles is coated with a conductive material.
• the particle size of the conductive particles is preferably from 0.2 / im to 20 / im.
• melt viscosity of the anisotropic conductive film 5 formed from the above constituent materials be in the range of 1.0 X 105 mPa's to 1.0 X 107 mPa's. If the melt viscosity of the anisotropic conductive film 5 is too large, a sufficient effect may not be obtained.
• solder resist 6 any ordinary solder resist used for this type of electronic component mounting module, such as an insulating resist material, can be used.
• a flexible substrate 1 having a plurality of wiring patterns 2 corresponding to bumps of an electronic component to be mounted is prepared by, for example, etching a flexible substrate on which copper foil is stuck on the entire surface.
• An opening is formed on the flexible substrate 1 such that one end of the wiring pattern 2 electrically connected to the bumps 4 of the electronic component 3 and a part of the flexible substrate 1 in a region where the electronic component 3 is mounted are exposed.
• the solder resist 6 is formed so as to surround the electronic component mounting region so as to have the following. This corresponds to Fig. 3A.
• the air on the flexible substrate 1 is heated, for example, by heating the flexible substrate 1.
• FIG. 3B the air on the flexible substrate 1 is heated, for example, by heating the flexible substrate 1.
• the anisotropic conductive film 5 is attached to the electronic component mounting area of the flexible substrate 1 with the heated air interposed. At this time, the higher the temperature of the air, the more the substantial amount of air that can be trapped can be reduced.
• thermosetting resin is used as the adhesive for the anisotropic conductive film 5
• the temperature is not higher than the reaction temperature of the anisotropic conductive film 5, such as the temperature at which the conductive resin is cured. Specifically, it is preferable that the temperature of the air is 60 or more and the reaction temperature of the anisotropic conductive film 5 is in the range of 90: to 150.
• the flexible substrate 1 to which the anisotropic conductive film 5 is attached is once cooled.
• the volume of air trapped under the anisotropic conductive film 5 can be reduced, and the generation of voids can be suppressed more reliably.
• the electronic component 3 is arranged at a predetermined position so that the surface of the electronic component 3 on which the bumps 4 are formed is on the anisotropic conductive film 5 side, and the arranged electronic component 3 is heated while being arranged. Crimp.
• the bumps 4 of the electronic component 3 and the wiring patterns 2 are electrically connected via the conductive particles in the anisotropic conductive film 5, and the electronic component mounting module is completed as shown in FIG. 3E. .
• the step of attaching the anisotropic conductive film 5 to the flexible substrate 1 it is inevitable that air is trapped between the flexible substrate 1 due to the uneven shape of the flexible substrate 1, etc.
• the trapped air is kept in an expanded state. That is, the substantial amount of air trapped between the anisotropic conductive film 5 and the flexible substrate 1 is reduced. For this reason, even when the electronic component is heated again in the crimping step of the electronic component, the generation of voids due to the expansion of the trapped air and the destruction of the anisotropic conductive film are suppressed.
• the present invention it is possible to avoid an inconvenience such as generation of voids and exposure of wiring due to trapped air, and to manufacture an electronic component mounting module having high reliability.
• anisotropic conductive films exhibiting relatively low fluidity AC F-1: ⁇ viscosity
• medium fluidity AC F-2: medium viscosity
• ACF-3 low viscosity
• a flexible substrate provided with a wiring pattern was prepared, and a solder resist was formed so as to surround a mounting area of the IC chip.
• an anisotropic conductive film was adhered so as to cover the opening of the solder resist while heating the flexible substrate so that the air on the flexible substrate was heated to 40 °.
• ACF-1 having a melt viscosity (100) of 2.5 X 107 mPa ⁇ s measured by a rheometer RS150 manufactured by Haake was used.
• the IC chip was aligned at a predetermined position on the anisotropic conductive film, and the IC chip was mounted on a flexible substrate by heating and pressing, thereby obtaining an electronic component mounting module.
• ACF_2 having a melt viscosity (100 ° C) of 1.1 X 107 mPa ⁇ s as measured by a rheometer RS 150 manufactured by Haake was used.
• An electronic component mounting module was manufactured in the same manner as described above except for the above.
• ACF-3 having a melt viscosity (100 :) of 4.0 X 106 mPa's as measured with a rheometer RS 15 manufactured by Haake was used as the anisotropic conductive film. Except for the above, an electronic component mounting module was produced in the same manner as described above.
• anisotropic conductive film was attached so as to cover the opening of the solder resist while the air on the flexible substrate was heated to 60, three types of anisotropic films were used as in Example 1 above.
• An electronic component mounting module was manufactured using the conductive film.
• Example 3 Except that the anisotropic conductive film was attached so as to cover the opening of the solder resist while the air on the flexible substrate was heated to 80 ° C, three types of materials were used as in Example 1 above. An electronic component mounting module was manufactured using an anisotropic conductive film.
• Example 2 As in Example 1, except that the anisotropic conductive film was attached so as to cover the opening of the solder resist while the air on the flexible substrate was heated to 120.
• Electronic component mounting modules were manufactured using various kinds of anisotropic conductive films.
• the same anisotropic conductive film as in each of the above-described embodiments was used, and in the step of attaching the anisotropic conductive film, air was not heated through the flexible substrate.
• An electronic component mounting module was manufactured in the same manner as in the example.
• the temperature of the air between the flexible substrate and the anisotropic conductive film in the comparative example was 25 which was room temperature.
• Table 1 shows the evaluation results.
• the evaluation criteria for each of the notations A to F in Table 1 are as shown in FIG. That is, A when the percentage of the void is 5% or less, B when the percentage is about 10%, and (: when the percentage of the void is about 40% and 13, 60% or less. F is over £, 80%.
• the air is heated in the step of attaching the adhesive sheet, whereby the electronic component is trapped between the adhesive sheet and the printed board. Since the amount of air generated can be substantially reduced, generation of a pond, exposure of a wiring pattern, and the like are avoided, and an electronic component mounting module having high reliability can be manufactured.

Landscapes

• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Electric Connection Of Electric Components To Printed Circuits (AREA)
• Wire Bonding (AREA)
• Structure Of Printed Boards (AREA)
• Combinations Of Printed Boards (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34308483

Family Applications (1)

Country Status (6)

Families Citing this family (13)

Citations (4)

Family Cites Families (8)

• 2003
  • 2003-09-09 JP JP2003317452A patent/JP4196377B2/ja not_active Expired - Lifetime
• 2004
  • 2004-05-05 US US10/560,849 patent/US7647694B2/en not_active Expired - Lifetime
  • 2004-05-12 KR KR1020057012576A patent/KR101015566B1/ko not_active Expired - Lifetime
  • 2004-05-12 WO PCT/JP2004/006677 patent/WO2005027604A1/ja not_active Ceased
  • 2004-05-12 CN CN2004800013595A patent/CN1717965B/zh not_active Expired - Lifetime
  • 2004-05-21 TW TW093114560A patent/TW200511912A/zh not_active IP Right Cessation

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