WO2005122657A1 - フレックスリジッド配線板とその製造方法 - Google Patents
フレックスリジッド配線板とその製造方法 Download PDFInfo
- Publication number
- WO2005122657A1 WO2005122657A1 PCT/JP2005/009819 JP2005009819W WO2005122657A1 WO 2005122657 A1 WO2005122657 A1 WO 2005122657A1 JP 2005009819 W JP2005009819 W JP 2005009819W WO 2005122657 A1 WO2005122657 A1 WO 2005122657A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rigid
- substrate
- layer
- connection
- flexible
- Prior art date
Links
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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
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4688—Composite multilayer circuits, i.e. comprising insulating layers having different properties
- H05K3/4691—Rigid-flexible multilayer circuits comprising rigid and flexible layers, e.g. having in the bending regions only flexible layers
-
- 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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/14—Structural association of two or more 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
- H05K3/36—Assembling printed circuits with other 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
- H05K3/36—Assembling printed circuits with other printed circuits
- H05K3/361—Assembling flexible printed circuits with other 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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
- H05K1/117—Pads along the edge of rigid circuit boards, e.g. for pluggable connectors
-
- 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
- H05K2201/09009—Substrate related
- H05K2201/09063—Holes or slots in insulating substrate not used for electrical connections
-
- 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
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09372—Pads and lands
- H05K2201/09481—Via in pad; Pad over filled via
-
- 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
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/095—Conductive through-holes or vias
- H05K2201/096—Vertically aligned vias, holes or stacked vias
-
- 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
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
- H05K2201/09781—Dummy conductors, i.e. not used for normal transport of current; Dummy electrodes of components
-
- 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
- H05K2201/09845—Stepped hole, via, edge, bump or conductor
-
- 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
- H05K2203/06—Lamination
- H05K2203/063—Lamination of preperforated insulating layer
-
- 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
- H05K3/22—Secondary treatment of printed circuits
- H05K3/24—Reinforcing the conductive pattern
- H05K3/244—Finish plating of conductors, especially of copper conductors, e.g. for pads or lands
-
- 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
- H05K3/323—Assembling printed circuits with electric components, e.g. with resistor 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
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4611—Manufacturing multilayer circuits by laminating two or more circuit boards
- H05K3/4614—Manufacturing multilayer circuits by laminating two or more circuit boards the electrical connections between the circuit boards being made during lamination
-
- 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
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4611—Manufacturing multilayer circuits by laminating two or more circuit boards
- H05K3/4614—Manufacturing multilayer circuits by laminating two or more circuit boards the electrical connections between the circuit boards being made during lamination
- H05K3/462—Manufacturing multilayer circuits by laminating two or more circuit boards the electrical connections between the circuit boards being made during lamination characterized by laminating only or mainly similar double-sided circuit boards
-
- 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.
- Y10T29/49126—Assembling bases
Definitions
- the present invention proposes a wiring board including a flexible board and a rigid board, and more particularly, a flex-rigid wiring board having a feature in a connection structure of an overlapped integrated portion of the flexible board and the rigid board in a rigid portion.
- a flex-rigid wiring board formed by connecting a flexible board and a rigid board has been used for a portable electronic device such as a foldable mobile phone.
- a wiring board connects an inflexible rigid rigid portion and a flexible flex portion via a flexible substrate as shown in Fig. 12, and the rigid portion is laminated.
- the pattern layers on the surface of the flexible substrate and the surface of the rigid S plate are electrically connected via a plated through-hole conductor layer (see, for example, Japanese Patent Application Laid-Open No. 5-90756). ).
- a notch is provided at the end of the multilayer rigid board to fit the tip electrode of the flexible board, and the tip of the flexible board is sandwiched between both outermost sides of the rigid board, and the electrode of the rigid board and the flexible board are connected to each other.
- a flexible rigid substrate that electrically connects the electrodes (see, for example, Japanese Patent Application Laid-Open No. H7-170076).
- a signal propagation delay occurs in a high-frequency region of 1 GHz or more, and a high-speed signal is generated. Transmission becomes unstable.
- the conventional flex-rigid board has a form in which the flexible board is fixed on the outermost rigid board with an anisotropic adhesive, or a form in which the flexible board is sandwiched between the outermost rigid boards.
- An object of the present invention is to provide a connection structure that is excellent in electrical characteristics and reliability of the conductor layers of a flexible substrate and a rigid substrate, has a small delay of an electric signal in a high-frequency region, and is advantageous for ensuring the stability of signal transmission.
- An object of the present invention is to provide a flex-rigid wiring board which is thinner than before. The inventors have conducted intensive studies to achieve the above object, and as a result, the electrical connection between the rigid substrate and the flexible substrate is not performed through the through-holes as in the prior art, but the rigid substrate is used.
- a rigid board made of a hard base material and a flexible board made of a flexible base material are superimposed and integrated, and a flex-rigid wiring board that is electrically connected to a rigid board.
- a rigid substrate having a conductor layer provided with connection electrode pads on at least one surface, and connection electrode pads provided on at least one surface of the rigid substrate at a position facing the connection electrode pads.
- a flexible substrate having a conductive layer provided thereon, and an electrically conductive adhesive layer interposed between conductive layers for at least ⁇ P including connection electrode pads and electrically connecting the flexible substrate to the flexible substrate. It is a board.
- either the flexible substrate or the rigid substrate has a cover lay on a surface, and the cover lay exposes the connection electrode pad.
- the opening has a structure in which the opening is filled with the anisotropic conductive adhesive.
- a plurality of connection electrode pads exposed from the opening of the cover lay on the flexible substrate may be provided with a distance between adjacent openings of 20 to 50 ( ⁇ m).
- the flexible substrate may have a via hole filled with a conductive material in a through hole extending from the front surface to the back surface, and the connection electrode pad may be provided directly above the via hole.
- the terms “flexible substrate” and “rigid substrate” include both a single layer and a multilayer.
- the flexible substrate and the rigid substrate are joined by the anisotropic conductive adhesive layer interposed between the conductor layers of the portion including at least the connection electrode pads arranged to face each other. Because the connection electrode pads of the flexible board and the connection pads of the rigid board are electrically connected, the delay in the high-frequency region can be reduced and high-speed signals can be quickly stabilized. As a result, excellent electrical connectivity and connection stability can be obtained.
- connection electrode pads are formed on the flexible substrate, and the distance between adjacent openings where the connection electrode pads are exposed, that is, from the edge of one of the two adjacent openings to the other, When the distance to the edge of the opening (separation distance) is within the range of 20 to 500 m, the local electrical connection between the flexible substrate and the rigid substrate by the anisotropic conductive adhesive is ensured. And miniaturization can be achieved.
- the flexible substrate has a via hole filled with a conductive substance in a through hole extending from the front surface to the back surface, and a connection electrode pad is provided directly above the via hole, thereby providing a position of the interlayer connection portion of the flexible substrate.
- the position of the layer connection part of the rigid board can be matched, and by forming a stacked structure in which these interlayer connection parts are overlapped and made conductive, the wiring length can be shortened and large power consumption can be achieved. This is suitable for mounting electronic components that require the above. ,
- a flex-rigid wiring board obtained by integrating a rigid board made of a hard base material and a flexible board made of a flexible base material
- a flexible substrate having a plurality of first connection pads located at the end, and a plurality of first conductor layers respectively connected to the first connection pads;
- a rigid board disposed below the flexible board, the frame pattern provided corresponding to an end of the flexible board, a plurality of second connection pads surrounded by the frame pattern, and a plurality of second connection pads.
- a rigid board having a plurality of via contacts disposed directly below the second connection pad, and a second conductor layer connected to the via contacts,
- a coverlay provided between the first conductor layer and the frame pattern, and electrically insulating the frame pattern from the first conductor layer;
- An anisotropic conductive adhesive layer formed so as to press-fit the first connection pad and the second connection pad,
- a flex-rigid wiring board in which a rigid substrate formed by laminating a hard base and a flexible substrate formed by a flexible base are integrated,
- the rigid substrate includes a first layer rigid substrate having a notch at an end thereof, and a second layer rigid substrate disposed below the first layer rigid substrate.
- the second layer rigid substrate is formed in a frame pattern formed so as to be exposed from the cutout portion of the first layer rigid substrate, and in a region surrounded by the frame pattern.
- the plurality of second connection pads, the plurality of via contacts formed directly below the second connection pads, and the second connection pads respectively connected to the via contacts.
- the flexible substrate is connected to the front end fitted into the notch of the first-layer rigid board, a plurality of first connection pads provided at the front end, and the first connection pads, respectively. And a plurality of first conductor layers,
- a coverlay is provided between the first conductor layer and the frame pattern, and electrically insulates the frame pattern from the first conductor layer.
- a flex-rigid wiring board characterized by the following.
- the widths of the first connection pads and the second connection pads provided on the flexible board and the rigid board, respectively, and the clearances between adjacent pads are substantially the same. Thus, both pads are uniformly connected to each other.
- a plurality of through-holes are formed in a region surrounded by the frame pattern provided on the second-layer rigid substrate as an escape route for excess conductive adhesive, thereby forming voids in the conductive adhesive layer. Occurrence can be reduced.
- a plating layer of nickel Z gold is formed on each surface of the first connection pad of the flexible substrate and the second connection pad of the rigid substrate, whereby the local connection by the conductive adhesive is performed. Electrical connection can be reliably performed.
- a first layer rigid substrate having a notch at an end was prepared, and a frame pattern exposed from the notch and a region surrounded by the frame pattern were formed.
- a second-layer rigid substrate having a plurality of second connection pads, a plurality of via contacts formed directly below the second connection pads, and a second conductor layer connected to the via contacts is prepared.
- FIG. 1 (a) to 1 (g) are views showing a part of a process for manufacturing a flex-rigid wiring board according to Example 1 of the present invention.
- 2 (a) to 2 (e) are views showing a part of a process of manufacturing the flex-rigid wiring board according to the first embodiment.
- FIG. 3 is a view similarly showing a part of a process of manufacturing the flex-rigid wiring board according to the first embodiment.
- FIG. 4 is a diagram illustrating the flex-rigid wiring board according to the first embodiment of the present invention.
- FIG. 5 (a) is a pulse voltage waveform diagram (1 GHz) showing a signal delay between connection electrode pads
- FIG. 5 (b) is a pulse voltage waveform diagram (5 GHz) showing a signal delay between connection electrode pads.
- FIG. 6 is an exploded perspective view of the flex-rigid wiring board according to Example 11 of the present invention.
- FIG. 7 is a partially broken perspective view of the same flex-rigid wiring board.
- FIG. 8 is a plan view of a second connection pattern of the flex-rigid wiring board.
- FIG. 9 is a view showing a part of a process of manufacturing a flex-rigid wiring board. ,.
- FIG. 10 is a cross-sectional view of a flex-rigid wiring board obtained by integrating a multilayer rigid board and a flexible board.
- FIG. 11 is a schematic cross-sectional view of a flex-rigid wiring board for explaining electrical connection between conductive pads by an anisotropic conductive adhesive.
- FIG. 12 is a schematic diagram showing a cross-sectional structure of a flex-rigid wiring board according to the related art. '
- the flex-rigid wiring board of the present invention includes an anisotropic conductive adhesive including a connection electrode pad for a flexible board and a connection electrode pad for a rigid board, the anisotropic conductive adhesive interposed in a region where the flexible board and the rigid board are overlapped.
- an anisotropic conductive adhesive including a connection electrode pad for a flexible board and a connection electrode pad for a rigid board, the anisotropic conductive adhesive interposed in a region where the flexible board and the rigid board are overlapped.
- the flex-rigid wiring board has a configuration in which a plurality of rigid boards are stacked in a multilayer on a single flexible board.
- the reason is that by increasing or decreasing the number of layers of the rigid board as necessary, for example, when this wiring board is incorporated in a mobile phone, etc., it becomes possible to easily adapt to the shape of the mounting component ⁇ casing Because.
- connection electrode pads are formed on at least one surface or both surfaces of the rigid substrate and the flexible substrate, respectively, at least in a region where the rigid substrate and the flexible substrate overlap. The reason is that the number of layers of the rigid substrate to be superimposed on the flexible substrate can be easily increased, and furthermore, the electrical and physical connection between the two can be reliably performed, and the connection electrode pads This is because the formation accuracy of the slab can be improved.
- the rigid substrate is connected at a plurality of locations of the flexible substrate, and each rigid substrate may be formed as a multilayer or a single layer composed of a conductor layer and a tree insulating layer.
- Each of the individually formed rigid substrates may be polymerized and integrated on one or both sides of the flexible substrate via an anisotropic conductive adhesive layer.
- the flexible substrate is provided with a via hole, and it is preferable that a connection electrode pad is provided almost directly above the via hole.
- the position of the interlayer connection portion of the rigid substrate is matched with the position of the interlayer connection portion of the flexible substrate, and these interlayer connection portions are overlapped. It is preferable to form a stack structure that is electrically connected together. The reason is that the so-called stack structure can reduce the wiring length and make it suitable for mounting electronic components that require high power.
- the flexible substrate according to the present invention may be any flexible substrate, and may be, for example, a plastic substrate, a metal substrate, a film substrate, or the like. , An aluminum substrate, an iron substrate, a polyimide film substrate, a polyethylene film substrate, and the like.
- those using a polyimide film as a base material are suitably used, and a flexible circuit board having a conductor circuit on both sides or one side is preferable.
- the thickness of the flexible substrate is about 5 to 100 jwm. The reason for this is that if the thickness is less than 5 m, the electrical insulation decreases, and if it exceeds 100 m, the flexibility decreases. These are the powers that are.
- the conductor circuit provided on the flexible substrate is formed on one or both sides of the substrate.
- the conductor circuit is formed by plating on the surface of the insulating film or by etching the metal foil of the insulating film to which the metal foil is attached.
- the connection electrode pad is preferably formed as a part of a conductor circuit.
- the thickness of the conductor circuit provided on the flexible substrate is about 3 to 75 jtm. The reason for this is that if the thickness is less than 3 m, the connection reliability is poor, whereas if it exceeds 75 / im, the bending reliability is reduced.
- connection electrode pad can be formed as a land of a via hole, and can be electrically connected to a different rigid substrate connected to both sides of a flexible substrate as described later via the via hole. it can
- connection electrode pads formed on the flexible substrate are not particularly limited.
- the connection electrode pads may be a circle having a diameter of 50 to 500 jum and a plurality of at a separation distance of 20 to 500 m. It is desirable to arrange. The reason is that at 20 jtm, there is concern about connection reliability, and at over 500 im, it is disadvantageous for high-density mounting. ,
- a force valley on the surface layer of the flexible substrate for electrical insulation between the conductor circuits is mainly formed of an insulating resin such as a photocurable resin or a thermosetting resin. It is preferably formed of a polyimide adhesive, an epoxy adhesive, or the like.
- the thickness of the coverlay is preferably 1.4 times or less the thickness of the connection electrode pad formed on the flexible substrate. The reason is that if the thickness of the coverlay is less than 1.4 times the thickness of the connection electrode pad, the anisotropic conductive adhesive will be easily connected to the connection electrode pad. This is because the conductive particles in the agent are easily dispersed uniformly. On the other hand, if the thickness of the coverlay exceeds 1.4 times the thickness of the connection electrode pad, the anisotropic conductive adhesive and the connection electrode pad are likely to be in an electrically unconnected state. In other words, the anisotropic conductive adhesive is likely to be out of contact with the connection electrode pad, and the conductive particles in the anisotropic conductive adhesive may be unevenly dispersed. is there. .
- the thickness of the coverlay is preferably 25 jum or less, for example, 20 m or More preferably, the thickness is 13 m or the like.
- an opening having a diameter equal to or larger than the diameter of the connection electrode pad is formed at a position corresponding to the connection electrode pad, and the opening is anisotropically formed.
- the conductive adhesive is filled.
- connection electrode pads By providing an opening in the force parlay and filling the opening with an anisotropic conductive adhesive, it is only easy to align the flexible substrate and the rigid substrate when they are polymerized and integrated. Instead, pressure concentrates on the anisotropic conductive adhesive layer between the connection electrode pads arranged opposite to each other, and the pressure-concentrated anisotropic conductive adhesive layer locally has conductivity. Electrical connection between the connection electrode pads can be reliably performed.
- the rigid substrate is used as an axis, the flexible substrate is received and alignment is performed, and when the rigid substrate is pressed against the flexible substrate, the pressing pressure on the rigid substrate is large. Even if it is too long, overload can be mitigated by the presence of a flexible substrate and a coverlay which are more flexible than the rigid substrate. On the other hand, even if the pressing pressure is too low, the anisotropic conductive adhesive layer can easily fill the cover of the flexible substrate, so that the electrical connection can be kept good.
- connection electrode pads are exposed on the surface of the rigid substrate, the exposed connection electrode pads allow the flexible substrate and the coverlay formed thereon to be pressed. Pressure is easily transmitted, and the conductive particles in the anisotropic conductive adhesive layer between the connection electrode pads are easily aggregated, so that the electrical connection can be performed more reliably.
- the diameter of the opening provided in the coverlay is in the range of 50 to 450 m.
- the reason is that it is difficult to fill the anisotropic conductive adhesive if the opening diameter is less than The reason is that if it exceeds 450 m, the conductive particles contained in the anisotropic conductive adhesive are less likely to aggregate.
- the case where the opening diameter is 100 to 300 jwm is suitable for filling the anisotropic conductive adhesive.
- the clearance between the opening diameter and the connection electrode pad is preferably in the range of 10 to 100 m. The reason is that if the clearance is less than 10 jum, alignment is difficult, and if it is more than 100 m, adjacent openings may come into contact with each other and the desired opening shape cannot be obtained. is there.
- the distance between two adjacent openings is in the range of about 20 to 500 m.
- the resin constituting the anisotropic conductive adhesive is too aggregated, and the elongation of the resin at that portion differs from the coefficient of thermal expansion. For this reason, cracks and the like may occur due to the tendency of stress due to heat change to concentrate.
- the resin constituting the anisotropic conductive adhesive is aggregated, it is difficult to cause particles to flow out to the adjacent conductor layer or to aggregate the conductive particles to a desired density. This is because it becomes difficult to secure the electrical connection between the two.
- the resin constituting the anisotropic conductive adhesive has a ratio of a portion where the metal particles and the like are concentrated to a portion where the metal particles and the like are dispersed in the joint portion. There are too many dispersed parts. For this reason, the elongation ratio of the resin with respect to the coefficient of thermal expansion differs, so that the stress due to the heat change concentrates and causes cracks and the like. In addition, the demand for higher density of substrates cannot be satisfied, which hinders miniaturization of portable electronic devices.
- the rigid substrate that constitutes the present invention is opposite to the “flexible” flexible substrate,
- the insulating resin base material to be formed is a glass cloth epoxy resin base material, a glass cloth bismaleimide triazine resin base material, a glass cloth polyolefin I-ylene ether resin base material, an aramide nonwoven fabric-epoxy resin base material, an aramide nonwoven fabric-polyimide It is preferable to use a hard base material selected from resin base materials, and a glass cloth epoxy resin base material is most preferable.
- the thickness of the insulating resin substrate is desirably about 50 to 600 jum. The reason is that if the thickness is less than 50 m, the strength decreases and handling becomes difficult, and the reliability of the electrical insulation is low. If the thickness exceeds 600 m, the formation of fine via holes and This is because the filling of the conductive material becomes difficult and the substrate itself becomes thick. 1
- the thickness of the copper foil to be stuck on one or both sides of the insulating resin substrate is desirably about 5 to 75 jum. The reason is that when forming an opening for forming a via hole in the insulating resin base material using laser processing as described later, the hole penetrates when the diameter is less than 5 m, and conversely when it exceeds 75 ⁇ m. This is because it is difficult to form a conductor circuit pattern having a fine line width by etching.
- the above-mentioned insulating resin base material and copper foil are, in particular, a single-sided or double-sided copper-clad laminate obtained by laminating a prepreg in which a glass cloth is impregnated with an epoxy resin into a B-stage and a copper foil and pressing the laminate with heat.
- a plate can be used. The reason is that the position of the wiring pattern and the via hole does not shift during handling after the copper foil is etched as described later, and the position accuracy is excellent.
- the conductor circuit formed on one or both surfaces of the insulating resin base material is formed by hot-pressing a copper foil having a thickness of 5 to 75 / m via a resin adhesive layer held in a semi-cured state, It is preferably formed by performing an appropriate etching process.
- the thickness of the conductor circuit formed at this time is desirably between 5 and 50 jum.
- the conductor circuit formed on the insulating resin substrate is prepared by applying an etching protection film on a copper foil attached to the surface of the substrate and covering it with a mask with a predetermined circuit pattern. It is desirable to form a conductor circuit including the electrode pads (via lands).
- a photosensitive dry film resist is attached to the surface of the copper foil, and then exposed and developed according to a predetermined circuit pattern to form an etching resist.
- the layer is etched to form a conductive circuit pattern including the electrode pads.
- At least one aqueous solution selected from aqueous solutions of hydrogen sulfate, hydrogen peroxide, persulfate, cupric chloride, and ferric chloride is preferable.
- the opening of the via hole provided in the insulating resin substrate is desirably made by laser irradiation.
- a transparent protective film such as a PET film
- a carbon dioxide laser is irradiated from above the polyethylene terephthalate (PET) film to penetrate the polyethylene terephthalate, PET film. Then, it is preferable to form an opening reaching the copper foil from the surface of the insulating resin base material.
- the diameter of such a hole be about 50 to 250 ⁇ m. The reason is that desmearing (copper plating) is difficult at less than 50 m, while laser workability M ⁇ decreases at over 250 / m.
- desmearing is desirably performed to remove resin birch remaining on the side and bottom surfaces of the Sekiguchi formed by laser irradiation.
- This desmear treatment is desirably performed by oxygen plasma discharge treatment, corona discharge treatment, ultraviolet laser treatment, excimer laser treatment, or the like.
- conductive paste ⁇ metal plating formed by electrolytic plating is preferable.
- the metal plating formed by the electrolytic plating process for example, Metal plating such as copper, tin, silver, various solders, steel tin, and copper silver is preferred, and electrolytic copper plating is particularly optimal.
- the above-mentioned conductive substance is not only filled in the opening reaching the conductor circuit through the insulating base material, but also can be formed to protrude to a predetermined height outside the opening, and the protruding height is 5 to 30. A range of m is desirable.
- connection electrode pads are formed on the outermost layer surface of the rigid substrate, and the shape, size, and number are not particularly limited, as in the case of the connection electrode pads formed on the flexible substrate. , With a diameter of 150 ⁇ 450 im
- connection reliability If it is less than 20 jt m, there is concern about the connection reliability, and if it exceeds 500 im, it is disadvantageous for high-density mounting. Also, the anisotropic conductive adhesive is affected by the reliability test, and the connection reliability may be reduced.
- a cover lay or a solder resist layer may be formed on the outermost layer surface of the rigid board for electrical insulation between conductor circuits.
- the cover lay is formed mainly of an insulating resin such as a photosensitive solder resist, similarly to the cover lay formed on the flexible substrate, and has a thickness of 1 .0 of the thickness of the connection electrode pad formed on the rigid substrate. It is preferable that it is 4 times or less.
- the coverlay may have a thickness of 25 m or less. More preferably, for example, the thickness is more preferably 20 m or 13 m.
- connection electrode pad it is preferable that an opening having a diameter equal to or larger than the diameter of the connection electrode pad is formed in a position corresponding to the connection electrode pad in such a cover layer.
- the diameter of the opening provided in the cover lay is preferably in the range of 50 to 300 m (50 to 450 jwm for flexible). The reason is that if the opening diameter is less than 50 m, the filling property of the anisotropic conductive adhesive decreases, and if it exceeds 300 / m, the conductive particles contained in the anisotropic conductive adhesive aggregate. This is because it becomes difficult.
- the clearance between the opening diameter and the connection electrode pad is in the range of 10 to 100 / m It is preferable. The reason is that if the clearance is less than 10 im, alignment is difficult, and if it exceeds 100 m, adjacent openings may contact each other, and the desired opening shape cannot be obtained. .
- the distance between two adjacent openings is in the range of about 20 to 500 jum.
- the reason for this is that if it is less than 20 / m, cracks and the like may occur, and it is difficult to secure desired electrical connection.
- the electrical connection between the rigid substrate previously connected between layers and the flexible substrate previously connected between layers can take various forms such as the following (1) to (4).
- the substrate material can be used effectively and a free wiring connection structure can be obtained.
- connection electrode pad As an interlayer connection part on the surface of one outermost layer of the rigid substrate, and forming a layer on one surface of the flexible substrate
- a connection electrode pad is formed as an indirect twill portion, and the electrode pads are electrically connected to each other via an anisotropic conductive adhesive.
- connection electrode pads as interlayer connection parts on both outermost layers of the rigid substrate
- the flexible substrate on which the connection electrode pads are formed is placed face-to-face with the connection electrode pads formed on both outermost layers of the rigid board, and anisotropic conductive bonding is performed between the connection electrode pads placed on the face. It is electrically connected via the agent.
- connection electrode pads as interlayer connection parts are formed on both sides of the flexible board, and one of the electrode pads is connected to those electrode pads.
- Each of the electrode pads of the rigid substrate having the connection electrode pads as the layer indirect layer formed on the outermost layer surface is The facing connection electrode pads are electrically connected via an anisotropic conductive adhesive.
- connection electrode pads that are formed in advance and that are individually formed on the rigid substrate and the flexible substrate and opposed to each other are electrically connected via an anisotropic conductive adhesive.
- connection modes (1) to (4) one mode in which a rigid board is connected at a plurality of locations of a flex board as described in (4) will be described. .
- a rigid substrate that has been connected between layers in advance is bonded to both surfaces (referred to as one “rigid portion”), and also at one end of the flexible substrate:
- a typical example is a form in which another rigid substrate connected in advance between layers is joined (the other is called a “rigid part”).
- the portion between both ends of the flexible substrate is a portion that does not come into contact with the rigid substrate (referred to as a “flex portion”), and the flex portion includes one rigid portion and the other rigid portion.
- parts and has a conductor circuit is provided for electrically connecting, d such conductor circuit are coated by conventional, insulating layer called a cover lay
- connection electrode pads are previously formed as a part of a conductor circuit in a predetermined region on one surface of a flexible substrate constituting each rigid portion, for example, in a surface region along a short side of an elongated rectangular substrate.
- an insulating layer having an opening such that the connection electrode pad is exposed to the outside is formed on the flexible substrate, and an anisotropic conductive adhesive layer is formed on the insulating layer.
- a plurality of connection electrode pads corresponding to the connection electrode pads provided on the flexible board are also formed in a predetermined region on the outer surface of the rigid board in which the conductor circuit and the insulating layer are formed in advance and the interlayer connection is made. It is formed.
- connection electrode pads formed on the flexible substrate and the connection electrode pads formed on the rigid substrate are opposed to each other, they are laminated and heated and pressed to form a plurality of connection electrodes in the rigid portion.
- the pad pairs are electrically connected via an anisotropic conductive adhesive layer on the flexible substrate, and are bonded by an anisotropic conductive adhesive layer in a surface area other than the connection electrode pads. It is unified as follows.
- connection electrode pad is formed as a part of a conductor circuit when one or two circuit boards constituting the outermost layer of the rigid board are formed by plating or etching. Although it can be formed, it may be formed alone on the insulating resin layer of the circuit board constituting the outermost layer, or may be formed through the insulating resin layer to make electrical connection with the lower conductive circuit. It can also be formed as a hole land.
- the formation region of the connection electrode pad formed on the rigid substrate does not necessarily need to be the entire region of the outermost insulating resin layer surface of the rigid substrate, and may be any arbitrary region that provides sufficient connection strength. Any location is acceptable.
- it may be a peripheral surface area along a short side or a long side of a rectangular substrate, or a surface area from the peripheral edge to the center of the substrate.
- connection electrode pads can be set at an arbitrary position, it depends on the design of the housing of the electronic device and the layout of other rigid boards and electronic components housed in the housing.
- the wiring can be drawn out in a desired direction, and a very advantageous wiring connection structure can be obtained.
- the “anisotropic conductive adhesive” for bonding and fixing the rigid substrate and the flexible substrate to each other, and electrically connecting the connection electrode pads formed on the rigid substrate and the flexible substrate,
- This is a resin adhesive in which conductive particles are dispersed in an insulating resin and conductivity is generated when pressure is applied.
- an anisotropic conductive adhesive for example, a material obtained by dispersing, as conductive particles, particles obtained by plating gold on the surface of 6 im 0 nickel particles in a thermosetting epoxy resin is used. Used. As the resin, a thermosetting epoxy resin or the like is used. .
- the conductive particles in addition to the gold-plated nickel particles, various forms such as resin-plated particles, nickel particles, silver particles, and the like coated with an insulating resin are used. .
- the average particle diameter of the conductive particles be in the range of 3 to 15 jLm. The reason is that if the average particle diameter is less than 5 im, it is difficult to disperse uniformly in the resin, while if it exceeds 15 m, the migration resistance is reduced.
- the thickness of the anisotropic conductive adhesive layer in which conductive particles are dispersed in such a resin is preferably about 15 to 55 m. The reason is that if the thickness is less than 15 im, the conductor pattern cannot be sufficiently buried, while if the thickness exceeds 55 / im, the re-bonding area with a large resin flow will spread. It is.
- a nickel-gold plating layer can be formed on the surface of each connection electrode pad provided on the rigid substrate and the flexible substrate in the present invention according to an ordinary method. Electrical connection between the conductive particles and each connection pad can be reliably performed.
- a resist layer is formed on the copper foil of the laminated film.
- a 300 m circular opening was formed, and the copper foil was opened by an etching treatment using an aqueous cupric chloride solution. Performing laser irradiation, such as carbon dioxide gas laser with respect to the opening, to form an opening 1 4 as to penetrate the resin layer reaches the back surface of copper foil (see Figure 1 (b)). (3) The opening 14 formed in (2) above was completely filled with copper plating by electrolytic copper plating to form a via hole 16, and then the resist layer was removed (see FIG. 1 (C)). ).
- a resist layer is formed on the copper foil 12 laminated on both sides of the insulating film 11, exposed, developed, and then etched by using an aqueous cupric chloride solution.
- a 30 j! Im wiring pattern 18 and a connection electrode pad 20 having a diameter of 250 jum and a thickness of 30 jUm were formed (see FIG. 1 (d)).
- a photosensitive epoxy resin (FR-5538EA, manufactured by Hitachi Chemical Co., Ltd.) is applied on the wiring pattern 18 including the area where the connection electrode pads 20 are formed, and dried at 80 ° C. for 3 hours ( (See Fig. 1 (e)), ⁇ An opening having a diameter of 300 mm is exposed so that each connection electrode pad 20 is exposed by exposing with an external line and developing using dimethylene glycol ethyl ether. A force parlay 24 having a thickness of about 30 m, which is almost the same as that of the wiring pattern 18, was formed. (See Figure 1 (f)).
- the openings 22 were formed at 16 locations along the short direction of the flexible substrate, and the distance between adjacent openings 22 was 100 m.
- Anisotropic conductive film (SONY Chemical Co., Ltd.) that covers the area where the coverlay 24 is formed and the area where the coverlay 24 is not formed and is as large as the area that overlaps the rigid substrate. (CP9472KS) was applied to form an anisotropic conductive adhesive layer 26 to obtain a flexible substrate 100A (see FIG. 1 (g)).
- the C-anisotropic conductive adhesive layer 26 may be formed by pressing an anisotropic conductive film, but the anisotropic conductive adhesive layer 26 is not anisotropic enough to prevent misalignment. It may be formed by temporarily compressing a conductive film.
- the anisotropic conductive adhesive layer 26 may be formed by applying an anisotropic conductive resin. At this time, the formed anisotropic conductive adhesive layer 26 may be completely cured, or may be a semi-cured B stage.
- a 0.1-mm-thick double-sided copper-clad laminate (Matsushita Electric Works: R-1766, Fig. 2) in which 12 jw m of copper foil 32 is laminated on both sides of a hard substrate 30 made of glass epoxy resin An opening for laser irradiation is formed on one side of (a) using an aqueous cupric chloride solution.
- a copper-filled opening 34 with a diameter of 250 m was formed using a laser (see Fig. 2 (b)).
- a Pd catalyst is applied to the inner wall of the opening 34, electroless copper plating is performed under the following plating solution composition and plating conditions, and then electrolytic copper plating is further performed. Then, the inside of the opening 34 was filled with copper plating to form a via hole 36 (see FIG. 2 (c)).
- Both surfaces of the substrate filled with copper plating are etched using an aqueous cupric chloride solution to form wiring patterns 38 on the front surface and the back surface, respectively, and a part of the wiring pattern 38 is formed. It was formed on the connection electrode pad 40 (see FIG. 2 (d)).
- the conductive particles were locally aggregated near the connection electrode pads 26 of the flexible substrate 100A, but the conductive particles were dispersed on the surface layer of the coverlay 24 and other wiring patterns 18.
- connection electrode pad 26 is made via the anisotropic conductive adhesive layer 26 interposed between the connection electrode pad 26 and the connection electrode pad 40 provided on the flexible substrate 100A, the rigid substrate 200A, and the force, respectively.
- a flexible rigid wiring board 300A was obtained, which was connected to the board and physically bonded to the other parts (see Fig. 4).
- a flex-rigid wiring board was manufactured in the same manner as in Example 1 except that the coverlay 24 provided on the flexible substrate 100A was formed so as to have a thickness of 25 jUm. (Example 3)
- a flex-rigid wiring board was manufactured in the same manner as in Example 1, except that the coverlay 24 provided on the flexible substrate 100A was formed to have a thickness of 40 m. (Reference Example 1)
- a flex-rigid wiring board was manufactured in the same manner as in Example 1, except that the coverlay 24 provided on the flexible substrate 100A was formed to have a thickness of 50 m. (Example 4)
- Example 1 except that no coverlay layer was formed on the flexible substrate 100A and the coverlay for protecting the wiring pattern excluding the connection electrode pads of the rigid substrate 200A was formed with a thickness of 30 jum. In the same manner as in the above, a flex-rigid wiring board was manufactured. (Example 5)
- a flex-rigid wiring board was manufactured in the same manner as in Example 4 except that the thickness of the cover layer for protecting the wiring pattern excluding the connection electrode pads of the rigid board 200A was set to 40 // m.
- the flex was the same as in Example 1.
- a rigid wiring board was manufactured.
- a flex-rigid wiring board was manufactured in the same manner as in Example 1, except that the distance between the openings formed corresponding to the connection electrode pads provided on the flexible substrate 100A was set to 300 jUm.
- a flex-rigid wiring board was manufactured in the same manner as in Example 1 except that the distance between the openings formed corresponding to the connection electrode pads provided on the flexible substrate 100A was 400 m.
- a flex-rigid wiring board was manufactured in the same manner as in Example 1, except that the distance between the openings formed corresponding to the connection electrode pads provided on the flexible substrate 100A was 500 jum.
- a flex-rigid wiring board was manufactured in the same manner as in Example 1, except that the distance between the openings formed corresponding to the connection electrode pads provided on the flexible substrate 100A was 10 jw m.
- a flex-rigid substrate according to the technique was manufactured according to the following (1) to (3) by a method according to JP-A-5-90756.
- an inner layer circuit 610 and a conductor circuit 612 are formed on a flexible substrate by a subtractive method, and then a punched cover-ray film is placed on the conductor circuit. Then, they were temporarily bonded, and then heated and pressed by a multi-stage press to produce an inner-layer circuit board and a flexible board 600 serving as a flexible portion.
- the inner circuit 610 and the outer circuit 614 are electrically connected via the through-hole 624 by electroless plating, and furthermore, the rigid portion is formed.
- the conductor circuit 626 By forming the conductor circuit 626 on the other surface, a flex-rigid wiring board 650 was obtained.
- Example 1 For Example 1 and Comparative Example 1, an arbitrary waveform generator (manufactured by Tektronix, Inc.)
- the flexible film was formed via the anisotropic conductive adhesive as in the present invention. It was found that the noise component in the high frequency band was smaller when the shivable substrate and the rigid substrate were connected than when they were connected via plated through holes.
- Figure 5 shows the effect of interference due to the reflected wave of the signal waveform. From this figure, as in the present invention, the connection between the flexible substrate and the rigid substrate via the anisotropic conductive adhesive (Example 1) is better than the case of using plated through holes (Comparative Example 1). It can be seen that the waveform distortion due to the reflected wave interference is small and the signal delay is small.
- the flex-rigid wiring board according to the present invention has an initial insulation resistance value of ⁇ 10 X 10 13 ( ⁇ ) at the joint between the rigid board and the flexible board. ), And the insulation resistance value after the reliability test is about 10 ⁇ 10 9 ( ⁇ ), so that reliable conduction can be obtained and excellent electrical connectivity can be obtained.
- FIG. 6 is an exploded perspective view of a flex-rigid wiring board according to Embodiment 11 of the present invention.
- the flex-rigid wiring board 47 is formed by, for example, joining and integrating a second-layer rigid board 58 as a rigid board made of a hard base and a flexible board 46 made of a flexible base.
- the flexible board 46 has a plurality of first connection pads 51 located at the ends and a plurality of first conductor layers 50 connected to the first connection pads 51, respectively.
- a second-layer rigid substrate 58 as a rigid substrate is disposed below the flexible substrate 46 and has a frame pattern 53 provided at an end and a frame pattern 53 provided at the end.
- It has a plurality of via contacts 55 formed directly below 54 and a second conductor layer 57 connected to each of the via contacts 55.
- a ray 59 is provided and the first connection pad 51 and the
- connection pad 54 An anisotropic conductive adhesive layer 60 for crimping and connecting to the connection pad 54 is provided.
- the coverlay 59 can be attached or applied to the lower surface of the flexible substrate 46. Further, the coverlay 59 may be attached or applied to the surface of the first conductor layer 50 provided on the lower surface of the flexible board 46 so as to expose the first connection pad 51 at the tip 52.
- the cover layer 59 is a means for electrically insulating the frame pattern 53 from the first conductor layer 50 by using an adhesive containing a polyimide resin as a main component, the first conductor layer 50 is connected to the tip 52 Can be adopted.
- coverlay 59 may be formed in a pattern that extends to the front end portion 52 and overlaps the frame pattern 53.
- the flexible substrate 46 a film-like substrate containing a polyimide resin as a main component can be used.
- the material of the flexible substrate 46 is not limited to polyimide resin, and for example, a substrate in which a double-sided copper foil layer is applied to a glass epoxy base material having a thickness of about may be used.
- the flex-rigid wiring board 47 may have a configuration in which a rigid board 45 formed by laminating a plurality of hard bases and a flexible board 46 formed by a flexible base are integrated.
- the rigid board 45 in the present invention includes, for example, a first-layer rigid board 49 having a cutout 48 at an end, and a second-layer rigid board 58 provided below the first-layer rigid board 49. Are formed by stacking.
- the second-layer rigid substrate 58 is formed in a frame pattern 53 exposed from the notch portion 48 provided in the first-layer rigid substrate 49, and in a region surrounded by the frame pattern 53.
- the flexible board 46 has a tip 52 fitted into the notch 48 provided in the first layer rigid board 49, a plurality of first connection pads 51 provided in the tip 52, and It has a plurality of first conductor layers 50 connected to one connection pad 51, respectively.
- the frame pattern 53 is electrically connected to the first conductor layer 50 provided on the flexible board 46 and the frame pattern 53 provided on the second-layer rigid board 58 from the first conductor layer 50.
- a cover lay 59 for electrically insulating is provided, and an anisotropic conductive adhesive layer 60 for pressing and connecting the first connection pad 51 and the second connection pad 54 is provided.
- the rigid substrate 45 according to the present invention includes a first-layer rigid substrate 49 obtained by patterning a metal conductive layer on an insulating resin substrate made of a hard base material such as a glass cloth epoxy resin base material or a glass cloth bismaleide triazine material. It can be manufactured by laminating the second-layer rigid substrate 58 with an adhesive.
- the flexible substrate 46 of the present invention has a plurality of first conductor layers 50 parallelly butted on the surface of a flexible plastic substrate such as a flexible substrate or a film substrate. At the distal end portion 52, first connection pads 51 connected to the first conductor layer 50 are formed.
- the first layer rigid substrate 49 has a notch 48 formed at an end portion by die-cutting or dicing.
- the conductor layer (not shown) provided on the surface of the first-layer rigid board 49 is connected to the second conductor layer 57 formed on the second-layer rigid board 58 in contact with the back surface via a via contact (not shown). The electrical connection is made.
- a plurality of second conductor layers 57, a plurality of second connection pads 54, and a frame-shaped frame pattern 53 surrounding the second conductor layer 57 are patterned on the surface of the second layer rigid substrate 58. ing.
- the frame pattern 53 is arranged so as to be exposed from the cutout 48 provided in the first-layer rigid substrate 49, and an insulating coverlay 59 is in contact with the frame pattern 53. It is arranged so that.
- the second connection pad 54 is electrically connected to the second conductor layer 57 via the via contact 55 formed immediately below and the conductor layer (not shown) formed on the back surface. Independently electrically insulated.
- the via contact 55 is formed by filling a metal plating into a non-through hole having a diameter of, for example, 60 ⁇ m, which is formed by laser irradiation, and forms a top of a metal plating layer protruding from the non-through hole.
- a metal plating into a non-through hole having a diameter of, for example, 60 ⁇ m, which is formed by laser irradiation, and forms a top of a metal plating layer protruding from the non-through hole.
- the second connection pad 54 has a clearance of about 10 to 125 m from the side of the adjacent frame /: turn 53. Also, the clearance between the second connection pads 54 can be set to be approximately equal in the range of about 10 to 125 m.
- the second connection pad 54 and the first connection pad 51 facing the second connection pad 54 are preferably formed so that the width of both pads and the clearance between the pads are substantially the same so as to be uniformly connected to each other.
- the width of both connection pads is preferably set to about 125 urn.
- the clearance between each connection pad is set to about 125 m, and the length of each connection pad is set to about 2 strokes.
- the anisotropic conductive adhesive 60 is temporarily fixed to the surfaces of the second connection pads 54 and the frame pattern 53.
- the conductive adhesive 60 has a higher melting point (for example, Tg: 171 ° C.) than the solder used when mounting the electronic components, because the electronic component mounting reflow is performed in a later process. It is preferable to select a material that has lower water absorption (for example, 0.7%) and lower thermal expansion (for example, 48 ppm) than the layer rigid substrate 58.
- the conductive adhesive 60 is, for example, referred to as “AFC”, which is an anisotropic conductive adhesive film, and has a trade name of “Anisolum AC—2 13” from Hitachi Chemical. ”Can be used.
- AFC anisotropic conductive adhesive film
- Hitachi Chemical. a trade name of “Anisolum AC—2 13” from Hitachi Chemical. ”
- the present invention is not limited to the illustrated conductive adhesive 60, and other equivalent materials can be used.
- the frame pattern 53 compresses the flexible board 46 and the second-layer rigid board 58. When they are in contact with each other, the flow of the compressed conductive adhesive 60 is made uniform, and at the same time, the conductive adhesive is prevented from flowing out (swelling) from the notch 48 to the outside. This is effective in ensuring electrical connection between the pad 46 and the second connection pad 54.
- the flexible substrate 46 in the present invention is supported by a support member 61 disposed on the back surface up to the boundary of the front end portion 52, and formed at the end of the rigid substrate 45.
- the tip 52 is fitted into the cutout 48 thus formed.
- the flexible board 46 has flexibility, it is preferable that the flexible board 46 be reinforced by the support member 61 in the assembling process, thereby facilitating the assembly of the flexible board 46 and supporting the flexible board 46 in a state where the flexible board 46 is incorporated in a final product.
- the member 61 is effective in reducing the stress applied to the tip 52.
- the flexible substrate 46 may be fitted to the notch 48 by attaching a support member 61 to the lower surface of the flexible substrate 46 as shown in the figure, and supported on the upper surface of the flexible substrate 46, contrary to the arrangement shown in the figure.
- the member 61 may be attached and fitted to the notch 48.
- the flexible substrate 46 may be provided with the support member 61 attached to either the upper surface or the lower surface of the flexible substrate 46 to form the notch portion 48. Can be fitted.
- the present invention is not limited to the configuration in which the illustrated length of the support member 61 is extended to the vicinity of the notch 48. That is, even if the support member 61 reinforces the flexible substrate 46 and fits into the notch 48 without bending, for example, even if the end of the support member 61 is several millimeters away from the notch 48, The member 61 can improve the workability of fitting the flexible board 46.
- the first conductive layer 50 patterned on the back surface of the flexible substrate 46 has first connection pads 51 (see FIG. 6) and second connection pads 54 surrounded by a frame-shaped frame pattern 53. Electrically connected via conductive adhesive 60 (see Fig. 6).
- the supporting member 61 may be removed after mounting the electronic component on the flex-rigid wiring board 47.
- the flex-rigid wiring board 47 according to the present invention can be assembled before mounting electronic components, the rigid board 45 and the flexible board 46 having different sizes can be separately manufactured from a large-area board. Thus, the productivity of both substrates can be improved.
- the frame pattern 53 provided at the end of the rigid substrate 45 is formed in a rectangular frame pattern on the surface of the rigid substrate 45.
- the frame pattern 53 is not limited to the illustrated rectangle, and may be replaced with a frame-like pattern such as a circle, an ellipse, or a trapezoid surrounding the plurality of second connection pads 54, for example.
- the second-layer rigid substrate 58 forms a non-penetrating stack-up via, and a plurality of second connection pads 54 bypass the frame pattern 53 via the via contact 55 and are separated from the frame pattern 53 by the second connection pad 54. It is electrically connected to the conductor layer 57 (see FIG. 6).
- the second connection pad 54 is patterned into a rectangle having corners on all sides.
- the first connection pad 51 is patterned into a rectangular shape to secure a region sandwiched between the first connection pad 51 and the second connection pad 54.
- the conductive adhesive 60 flows when the flexible substrate 46 and the second-layer rigid substrate 58 are pressed against each other, and conductive particles are deposited in a region sandwiched between the first connection pad 51 and the second connection pad 54. Since the conductive particles are locally concentrated and the conductive particles are diffused in the peripheral region of both pads, the first connection pad 51 and the second connection pad 54 are electrically connected.
- the frame pattern 53 is formed at the time of assembling the flex-rigid wiring board 47,
- connection / head 54 The flow of the anisotropic conductive adhesive 60 covering the connection / head 54 can be kept uniform in the area surrounded by the frame pattern 53, and the electrical connection between the first and second connection pads can be made. Connection can be ensured.
- the insulation breakdown progresses due to the electric field concentration of the conductive particles, and the life of the ACF junction is determined by the average distance between the conductive particles.
- the first connection pad 51 and the second connection pad 52 are sandwiched between the tops.
- the conductive particles uniformly flow around the first connection pad 51 and the second connection pad 52 surrounded by the frame pattern 53 while ensuring conductivity by the conductive particles thus surrounded, and are surrounded by the frame pattern 53.
- the average distance between the conductive particles in the insulating region can be increased.
- connection pad 51 and the second connection pad 52 are each formed at a fine pitch, the electric field strength near the conductive particles affected by the electric field concentration at the edge portions of both connection pads 51 and 52 is reduced. Even if it rises, the conductive particles are uniformly dispersed, so that the insulation life of the conductor passage formed by the first connection pad 51 and the second connection pad 52 is significantly improved as compared with the conventional case.
- the improvement of the electrical characteristics and the insulation life due to the ACF junction can be applied to a printed wiring board to which a higher density pattern and a higher voltage are applied than before.
- the second-layer rigid substrate 58 has the plurality of through-holes 62 formed in the region surrounded by the frame pattern 53, the occurrence of voids in the conductive adhesive 60 can be reduced.
- These through-holes 62 are formed in a clearance region between the second conductive pads 54 and a clearance region between the second conductive pad 54 and the inner side of the frame pattern 53 as shown in the figure.
- the formation region of the through-hole 62 is not limited to the two-layer rigid substrate 58 exposed in the region surrounded by the frame pattern 53, and reduces the generation of voids in the conductive adhesive 60.
- the through-hole 62 for ensuring the connection reliability of the first and second conductive pads may be formed only in the clearance region between the second conductive pads 54.
- a flex-rigid wiring board in which a rigid substrate 58 formed by laminating a hard base material and a flexible substrate 46 formed by a flexible base material are integrated, a plurality of first connection pads 5 1 And a flexible board 46 having a plurality of first conductor layers 50 connected to the first connection pads 51, respectively, and A first-layer rigid board 49 having a notch 48 is prepared, and a frame pattern 53 formed at a position corresponding to the notch 48 provided on the first-layer rigid board 49 so as to be exposed from the notch 48; A plurality of second connection pads 54 formed in a region surrounded by the frame pattern 53, a plurality of via contacts 55 formed immediately below the second connection pads 54, and a connection to each of the via contacts 55 A second-layer rigid substrate 58 having a second conductor layer 57 to be formed is prepared.
- the first conductive layer 50 of the flexible substrate 46 and the frame of the second rigid substrate 58 are formed.
- a cover lay 59 is formed between the first conductive layer 50 and the cover lay 59 so as to electrically insulate the frame pattern 53 from the first conductor layer 50.
- a flex-rigid wiring board is manufactured by fitting the first connection pad 51 and the second connection pad 54 by crimp connection via the anisotropic conductive adhesive 60 by fitting into the notch 48 of the board 45.
- the anisotropic conductive adhesive 60 interposed between the second-layer rigid board 58 and the flexible board 46 is sandwiched between the cover lay 59 and the cover lay 59.
- the conductive adhesive 60 is temporarily fixed so as to be provided in a range that covers the formed second connection pad 54 and to be in close contact with the second-layer rigid substrate 58.
- the conductive adhesive 60 is applied to the frame pattern 53 formed on the second-layer rigid substrate 58, the coverlay 59 on the frame pattern 53, and the surface of the second conductive pad 54 surrounded by the frame pattern 53. And is temporarily fixed.
- the second-layer rigid substrate 58 placed on the press base 64 and the flexible substrate 46 laminated on the second-layer rigid substrate 58 are overlapped, and the pressing die 63 applies pressure and heat to the substrate.
- the tops of the first connection pad 51 and the second connection pad 54 are joined.
- the first conductor layer 50 extends from or is connected to the first connection pad 51, but since the coverlay 59 is arranged in a region overlapping with the frame pattern 53, the first conductor layer 50 This is advantageous in that 50 are not electrically connected to each other.
- the flexible substrate 46 is pressed and heated by the press die 63 via the cushion 65, the area surrounded by the frame pattern 53 bends, so the first connection pad 51 is connected to the second connection pad 51. It is also advantageous that the tops of both connection pads can be joined close to pad 54.
- the cover lay 59 is sandwiched between the frame pattern 53 and the first conductive layer 50, it corresponds to the thickness of the cover lay 59 between the first connection pad 51 and the second connection pad 54. Although a gap is generated, since the flexible substrate 46 bends, the first connection pad 51 can be brought close to the second connection pad 54 to join the tops of both connection pads.
- the present invention is not limited to the embodiment in which the flexible substrate 46 is fitted to the rigid substrate 45 formed by laminating the first-layer rigid substrate 49 and the second-layer rigid substrate 58 described above.
- a flexible board 46 is fitted to an end of a multilayer rigid board composed of a first-layer rigid board 58 having a copper foil pattern formed on an insulating layer made of prepreg and lower-layer rigid boards 58a to 58d. It can be a combined form.
- a resistance element 66 is provided inside the first-layer rigid substrate 49, and a terminal of the resistance element 66 is electrically connected to an upper conductor layer through a via contact. be able to.
- the resin-coated copper foil layer (RCC) 68 is located at the bottom of the lower rigid board 58d, and has a conductor layer formed on the back surface of the lower rigid board 58d and a conductor layer in the resin-coated copper foil layer 68. Are laminated with a dielectric layer interposed therebetween, whereby capacitor 67 can be formed.
- Such a flex-rigid wiring board laminates a first-layer rigid board 49, a second-layer rigid board 58, a lower-layer rigid board 58a to 58d, and a resin-coated copper foil layer 68 before surface mounting electronic components.
- the flexible board 51 is fitted into the notch of the first-layer rigid board 49, and the first connection pad 51 and the second connection pad 54 are thermocompression-bonded via a conductive adhesive. Is preferred.
- the flexible substrate 46 in the figure can be thermo-compressed through a cushion even if a substrate that is substantially the same as or thinner than the first-layer rigid substrate 49 of the same layer is used. Therefore, the first connection pad 51 and the second connection pad 54 can be reliably connected.
- the flex-rigid substrate does not protrude from the flexible substrate 46 on the surface, and an electronic component mounting substrate that is reduced in thickness overall can be provided.
- the flexible board 46 is fitted into the cutout of the first-layer rigid board 49, the mechanical strength of the flexible board 46 against vertical and horizontal stresses when the flexible board 46 is bent is increased.
- connection pad 51 and the second connection pad 54 are electrically connected via the conductive adhesive 60 as shown in FIG. 11, the electrical characteristics are superior to those of the prior art and the reliability is higher. Can be improved.
- a nickel-plated layer can be formed on the surfaces of the first connection pad 51 and the second connection pad 54 according to a conventional method, whereby the conductive particles in the anisotropic conductive adhesive can be formed. Electrical connection to each connection / head can be reliably performed.
- the conductive adhesive 60 is a gel-like or sheet-like mixture mainly composed of an epoxy-based adhesive and conductive particles 69.
- the conductive particles 69 are elastic members made of substantially spherical nickel or plastic.
- the conductive adhesive 60 is sandwiched in the bonding area 72 between the upper flexible board 46 and the lower second-layer rigid board 58, and the cushion 65 (see FIG. 9) and the press mold 63 (see FIG. 9). Pressure from above and below while heating.
- the conductive adhesive 60 is configured such that when heated and pressed, a plurality of first connection pads are formed.
- a plurality of conductive particles 69 flowing from the top of the first connection pad 51 and the second connection pad 54 to the periphery of the pad and being sandwiched between the tops of the first connection pad 51 and the second connection pad 54 and crushed up and down are formed in the bonding region 72 by the two pads. Secure the electrical connection between them.
- the conductive particles flowing around the first connection pad 51 and the second connection pad 54 The child 69 floats in the epoxy-based adhesive and forms an insulating region 73 because the conductive particles 69 do not contact each other.
- the conductive adhesive 60 can secure an electrical connection between the first connection pad 51 and the second connection pad 54 that are vertically opposed to each other in the conductive region, and can also use the adjacent first or second conductive pad 51. Between them, electrical insulation can be ensured. Since the conductive adhesive 60 contains an epoxy-based adhesive, the flexible adhesive 46 and the second-layer rigid substrate 58 can be bonded by hardening at room temperature after flowing. Therefore, the mechanical bonding strength between the flexible board 46 and the second-layer rigid board 58 can be further increased.
- the conductive adhesive 60 can be re-joined by adding a plastic component, and the flexible substrate 46 is heated from room temperature to soften the conductive adhesive 60, and the flexible substrate 46 is rigidified into the second layer. It can be separated from substrate 58 and rejoined with a separate replacement flexible substrate.
- the rigid substrate and the flexible substrate are bonded together by connecting the anisotropic conductive material between the connection electrode pad provided on the rigid substrate and the connection electrode pad provided on the flexible substrate.
- an adhesive it is possible to suppress the delay of electric signals at the giga-level and secure the stability of electric signals, and at the same time, to create a flex-rigid board that has excellent electrical connectivity and connection reliability and is advantageous for thinning. provide.
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US10/558,289 US7423219B2 (en) | 2004-06-11 | 2005-05-23 | Flex-rigid wiring board |
JP2006519574A JP5006035B2 (ja) | 2004-06-11 | 2005-05-23 | フレックスリジッド配線板とその製造方法 |
EP05743245A EP1659840A4 (en) | 2004-06-11 | 2005-05-23 | STARR BENDED PCB AND MANUFACTURING METHOD THEREFOR |
US11/965,106 US20080107802A1 (en) | 2004-06-11 | 2007-12-27 | Flex-rigid wiring board |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-173414 | 2004-06-11 | ||
JP2004173414 | 2004-06-11 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/965,106 Division US20080107802A1 (en) | 2004-06-11 | 2007-12-27 | Flex-rigid wiring board |
Publications (1)
Publication Number | Publication Date |
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WO2005122657A1 true WO2005122657A1 (ja) | 2005-12-22 |
Family
ID=35503554
Family Applications (1)
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---|---|---|---|
PCT/JP2005/009819 WO2005122657A1 (ja) | 2004-06-11 | 2005-05-23 | フレックスリジッド配線板とその製造方法 |
Country Status (6)
Country | Link |
---|---|
US (2) | US7423219B2 (ja) |
EP (1) | EP1659840A4 (ja) |
JP (1) | JP5006035B2 (ja) |
KR (1) | KR100854614B1 (ja) |
CN (2) | CN101896037B (ja) |
WO (1) | WO2005122657A1 (ja) |
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Also Published As
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EP1659840A4 (en) | 2010-03-03 |
CN1806474A (zh) | 2006-07-19 |
JPWO2005122657A1 (ja) | 2008-04-10 |
US20080107802A1 (en) | 2008-05-08 |
EP1659840A1 (en) | 2006-05-24 |
CN101896037A (zh) | 2010-11-24 |
KR20060052696A (ko) | 2006-05-19 |
KR100854614B1 (ko) | 2008-08-27 |
CN101896037B (zh) | 2013-08-14 |
US20070012475A1 (en) | 2007-01-18 |
JP5006035B2 (ja) | 2012-08-22 |
US7423219B2 (en) | 2008-09-09 |
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