JP2005135998A - Circuit board with built-in electrical component and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit board having a built-in electrical component which is reduced in size, increasing the mounted electrical components in number, by building the electrical components in an insulating board and which is capable of exchanging mass information with the outside. <P>SOLUTION: A single or plural resin layers 1 are laminated, and an insulating board 2 is formed. A conductor circuit 3 is formed on either one or both sides of, at least one or more of the resin layers 1. The electrical component 4 electrically connected to the conductor circuit 3 is embedded in one or more of the resin layers 1. A recess 6 is provided to the end face of the insulating board 2. Connection terminals 5 electrically connected to the conductor circuit 3 are provided to the inner surface 7 of the recess 6, and a female connector 8 is formed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electric / electronic component / semiconductor element built-in module, for example, an electric component built-in circuit board used for an IC card (integrated circuit built-in card) and the like, and a method of manufacturing the same.

  In recent years, with the demand for higher functionality and smaller size and thinner electronic devices, higher integration of semiconductors, shorter wiring distances, and smaller printed wiring boards are required. Such a printed wiring board is mounted with a chip-shaped electrical component such as a semiconductor device, a bare chip, a chip-shaped capacitor, or a chip-shaped inductor as an electrical component. A light emitting / receiving element such as an LED, a connector, and the like are also mounted.

  However, since such electrical components are mounted only on the conductor circuit on the outer layer of the printed wiring board, there is a limit to the amount of electrical components mounted on the printed wiring board, and the electrical components protrude from the outer surface of the printed wiring board. Therefore, the printed wiring board is hindered from being miniaturized. In addition, when the mounting position of the electrical component is only the outermost layer of the wiring board, the degree of freedom in wiring design is low.

  Such a problem becomes more apparent as the printed wiring board is multilayered. That is, as the number of printed wiring boards increases, the amount of wiring increases. However, since the electrical components are mounted only on the outer layer, the amount of mounting of the electrical components with respect to the amount of wiring is reduced. Miniaturization has been limited by the amount of electrical components to be mounted.

  Conventionally, as disclosed in Patent Document 1, a gap is provided in the insulating layer, a semiconductor element or the like is mounted in the gap, and an insulating layer made of a photosensitive resin and a wiring circuit are sequentially laminated and formed. A device for manufacturing a multilayer wiring board has also been proposed. According to this, it becomes possible to mount an electrical component in the insulating layer, and the mounting amount of the electrical component, the miniaturization of the wiring board, and the improvement of the degree of freedom of wiring are made to some extent. When a gap is created between the electrical components and the air is trapped and subjected to heat load, the thermal expansion of the air in the air gap causes defects such as cracking of the insulating layer, breakage of the electrical components, and disconnection. In addition, the manufacturing process becomes complicated because gaps must be formed in the insulating layer in accordance with the dimensions and mounting amount of the electrical components.

  In addition, an IC card incorporating an integrated circuit or the like requires a connector for input / output of information (exchange of signals) with the outside. At present, such a portable electric component built-in circuit is used. The number of terminals of the board connector is limited to 3-4. It is necessary to increase the number of connector terminals than before in order to allow large volumes of information to be taken in and out, but on the other hand, connectors with multiple terminals occupy a large volume and are bulky. At the same time, it is difficult to manufacture an IC card or the like that is convenient for carrying, and further miniaturization is impossible.

  In addition, when performing signal exchange by optical communication, conventionally, a light receiving / emitting element is mounted on the outer layer of the printed wiring board, and in order to efficiently collect and receive light on the light receiving / emitting element, a reflecting mirror, a lens, A phosphor or the like is also attached to the outer layer of the printed wiring board, and such a printed wiring board has finally become a very large structure. Furthermore, it is thought that signal exchange by optical communication will increase in the future, but when the light emitting / receiving element is mounted on the surface of the board as described above, the area where other components are mounted is reduced, resulting in a large size. There is a problem that it becomes impossible to exchange capacity signals.

Moreover, as a thing which incorporates an electrical component, the memory card currently disclosed by patent document 2 can be mentioned. However, in this case, a large space exists between the substrate on which the electronic component is mounted and the case body, and there is a limit to downsizing.
Japanese Patent Laid-Open No. 11-126978 Japanese Utility Model Publication No.7-17569

  The present invention has been made in view of the above points, and by incorporating an electrical component in an insulating substrate, it is possible to reduce the size while increasing the amount of electrical component mounted. It is an object of the present invention to provide an electric component built-in circuit board that can be taken in and out from the outside and a method for manufacturing the same.

  The circuit board with a built-in electrical component according to claim 1 of the present invention has a single resin layer 1 or a laminate of a plurality of resin layers 1 to form an insulating substrate 2, and at least one surface of one or more resin layers 1 or Conductor circuits 3 are formed on both surfaces, electrical components 4 electrically connected to the conductor circuits 3 are embedded in at least one resin layer 1, and recesses 6 are formed on the side surfaces of the insulating substrate 2. A connection terminal 5 electrically connected to the conductor circuit 3 is provided on the inner surface 7 of the recess 6 to form a female connector 8.

  The invention of claim 2 is characterized in that, in claim 1, the connection terminal 5 is formed of a light emitting / receiving element 9.

  A third aspect of the invention is characterized in that, in the first or second aspect, a material selected from the circuit protection insulating layer 10 and the electromagnetic shielding metal layer 11 is formed on the surface of the insulating substrate 2. .

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the silicon heat radiating resin sheet 12 is disposed in contact with the electrical component 4.

  According to a fifth aspect of the present invention, there is provided a method of manufacturing a circuit board with a built-in electric component, wherein the conductor circuit 3 is provided on the transfer surface 14 of the transfer substrate 13 and the female connector forming component 15 having the electric component 4 and the hollow portion 46 is provided. Are electrically connected to the conductor circuit 3 and disposed on the transfer surface 14 of the transfer substrate 13, and then the transfer surface 14 of the transfer substrate 13 is opposed to the surface of the resin layer 1 of the B stage. Then, the resin layer 1 and the transfer substrate 13 are laminated, and the conductor circuit 3, the electrical component 4, and the female connector forming component 15 are embedded in the resin layer 1, and then the transfer substrate is transferred from the resin layer 1. By peeling only 13, the conductor circuit 3 is exposed on the surface of the resin layer 1, the electrical component 4 and the female connector forming component 15 are embedded in the resin layer 1, and then the female connector is formed. The resin layer 1 is cut in the thickness direction so as to pass through the hollow portion 46 of the component 15. The Rukoto, is characterized in that to open the recess 6 of the female connector forming part 15 on the side surface of the resin layer 1.

  The invention of claim 6 is characterized in that, in claim 5, the female connector forming component 15 is provided with a removable cap 47 and a hollow portion 46 formed therein.

  According to the circuit board with a built-in electrical component according to claim 1 of the present invention, it is possible to reduce the size while increasing the mounting amount of the electrical component by incorporating the electrical component in the insulating substrate. In addition, a large amount of information can be exchanged with the outside.

  According to the second aspect of the present invention, large-capacity signals can be exchanged by optical communication.

  According to the invention of claim 3, it is possible to protect the conductor circuit formed on the outer surface of the insulating substrate and prevent electromagnetic interference.

  According to invention of Claim 4, heat dissipation can be improved and, thereby, the functional fall of an electrical component can be prevented.

  According to the method of manufacturing the circuit board with a built-in electrical component according to claim 5 of the present invention, the electrical component is built in the insulating substrate, so that the mounting size of the electrical component can be increased and the size can be reduced. . In addition, a large amount of information can be exchanged with the outside.

  According to the invention of claim 6, by attaching a removable cap to the female connector forming component and covering it, the resin of the resin layer melted and softened in the molding process is contained in the hollow portion of the female connector forming component. It is possible to prevent inflow.

  Embodiments of the present invention will be described below.

  FIG. 1 shows an example of the manufacturing process of the electric component built-in circuit board A according to the present invention. In this process, first, the conductor circuit 3 is provided on one surface (transfer surface 14) of the transfer substrate 13. Examples of the method for forming the conductor circuit 3 on the transfer base material 13 include a method of attaching a metal foil such as a copper foil to the transfer base material 13 and etching the metal foil. If it is a method using pattern plating by plating or the like, the fine conductor circuit 3 can be easily formed, and the high-frequency loss of the circuit board A with built-in electrical components that is finally obtained is reduced and the high-frequency reliability is improved. It is something that can be done. The thickness of the conductor circuit 3 is preferably 5 to 35 μm.

  Here, the formation of the conductor circuit 3 by plating treatment can be performed, for example, through steps of forming a plating resist, plating treatment, and peeling of the plating resist. The plating resist can be formed by a general method using a photosensitive dry film, resist ink, or the like. The plating treatment can be performed by forming a plating film made of copper, nickel, gold or the like by a general method. Thus, when the conductor circuit 3 is formed by plating, in order to improve the adhesion between the resin layer 1 and the conductor circuit 3 during the transfer of the conductor circuit 3 described later, the high-frequency characteristics are not impaired. It is preferable to perform a surface treatment on the plating film. As such a surface treatment, for example, a roughening treatment such as a blackening treatment or an alumite treatment can be given.

  Next, as shown in FIG. 1A, the electrical component 4 is electrically connected to the conductor circuit 3 and disposed on the transfer surface 14 of the transfer substrate 13. As the electrical component 4, a passive component (LCR) such as a chip-shaped resistor, a chip-shaped capacitor, or a chip-shaped inductor can be mounted. In this case, the chip-shaped component is a conductor circuit by solder 17. 3 can be connected. Further, as the electrical component 4, an active component (IC) such as a semiconductor bare chip such as a silicon bare chip can be mounted. In this case, although not shown in FIG. 1, the semiconductor bare chip is connected to the conductor circuit 3 by solder balls 18 and the like, and the underfill 19 is filled and cured in the same manner as shown in FIG. can do. As the underfill 19, one made of a general epoxy resin composition or the like can be used. The electrical component 4 can also be mounted using the conductive paste 52, but the connection with the solder 17 has higher mounting reliability as described above.

  The LCR may be provided by printing or in a sheet form. For example, when printing a resistance element (printing resistance), a high-capacity element is obtained by printing a paste-like resistance material in which metal powder is mixed in a thermosetting resin and then heating the paste-like resistance material. Can be formed. In addition, when forming a capacitor element, after printing a paste-like dielectric material in which barium titanate or the like is mixed as a high dielectric constant filler in a thermosetting resin, it is heated to increase the capacity. These elements can be formed. In particular, a higher dielectric element can be formed by firing the resin content of the paste and volatilizing it to form a ceramic.

  Further, as shown in FIG. 1A, the female connector forming component 15 having the hollow portion 46 is electrically connected to the conductor circuit 3 and disposed on the transfer surface 14 of the transfer substrate 13. Here, the female connector forming component 15 can be formed as a rectangular parallelepiped or cylindrical casing 48 by molding an insulating resin such as engineering plastic. Inside the casing 48, a plurality of connection terminals 5 required for exchanging large-capacity signals are provided. Each connection terminal 5 is electrically connected to a plurality of leads 20 provided on the outer surface of the casing 48, and a part of the casing 48 is provided with an insulating resin 49 of the same or different kind as described above. By filling, the insulation between the connection terminals 5 is ensured and each connection terminal 5 is fixed. Further, a hollow portion 46 is formed in the remaining portion of the housing 48, and each connection terminal 5 protrudes into the hollow portion 46 from the surface of the insulating resin 49 filling a part of the housing 48. Yes. It is preferable that an opening 50 is provided in a part of the casing 48 forming the hollow portion 46, and a removable cap 47 is provided in the opening 50.

  Then, the connection terminal 5 provided in the female connector forming component 15 and the conductor circuit 3 are electrically connected. Specifically, as shown in FIG. 1A, the lead 20 provided on the outer surface of the housing 48 and the conductor circuit 3 are joined with solder 17, whereby the connection terminal 5 and the conductor are connected via the lead 20. The circuit 3 is electrically connected. Here, in the case of using the female connector forming component 15 provided with the cap 47 described above and having the hollow portion 46 formed, the cap is removed from the female connector forming component 15 before the connection with the solder 17. 47 is preferably removed. By doing so, the air in the hollow portion 46 of the female connector forming component 15 can be freely circulated to the outside of the female connector forming component 15 through the opening 50. When the cap 47 is not provided, the air in the hollow portion 46 of the female connector forming part 15 is expanded by the heat of the solder 17, so that the female connector forming part 15 may be damaged. However, when the removable cap 47 is provided, there is no such fear. 1, the protruding direction of the connection terminal 5 is substantially parallel to the transfer surface 14, and the tip of the connection terminal 5 is not opposed to the electrical component 4.

  The adhesion strength (peel strength) between the transfer substrate 13 and the conductor circuit 3 is preferably 0.098 to 1.96 mN / cm (10 to 200 gf / cm), and 0.294 to 0.882 mN / cm. More preferably, it is cm (30 to 90 gf / cm). Within such a range, the adhesion and peelability between the transfer substrate 13 and the conductor circuit 3 can be obtained with a good balance. However, if the above adhesion strength is too small, the adhesion between the conductor circuit 3 and the transfer substrate 13 may be insufficient. Conversely, if the above adhesion strength is too large, the conductor circuit 3 may be When transferring from the transfer substrate 13 to the resin layer 1, the conductor circuit 3 and the transfer substrate 13 may not be completely peeled off.

  As the transfer substrate 13, a metal substrate is preferably used. In particular, it is preferable to use a stainless steel substrate. Since stainless steel has low adhesion to the conductor circuit 3 and the resin layer 1 made of a metal such as copper, it is possible to obtain high peelability from the resin layer 1 and the conductor circuit 3 during the transfer of the conductor circuit 3. The conductor circuit 3 can be easily transferred to the resin layer 1. As the stainless steel substrate, SUS304 or SUS301 can be used. Among these, since SUS301 is excellent in plating adhesiveness, it is particularly preferable to use SUS301.

  When a stainless steel substrate is used, the thickness is preferably 50 to 200 μm, and handling properties are particularly good when it is about 100 μm. That is, when a stainless steel substrate having a thickness of 50 to 200 μm, particularly 100 μm, is used, the transfer substrate 13 has high toughness and moderate flexibility, so that it is transferred during transfer of the conductor circuit 3 as described later. The substrate for transfer 13 can be easily peeled from the resin layer 1 without bending the resin layer 1 by bending the substrate for transfer 13. Further, even when a large number of electrical components 4 are mounted, the handleability is good. For example, when a large number of electrical components 4 are mounted on the conductor circuit 3, operations such as carrying in and out of the reflow furnace can be easily performed. Further, even when the transfer surface 14 becomes dirty when the conductor circuit 3 is formed or when the electric component 4 is mounted, it can be easily cleaned by degreasing after the formation of the conductor circuit 3 or after the electric component 4 is mounted. It is possible to prevent dirt from being transferred to the layer 1 and to prevent a decrease in reliability.

  When a stainless steel substrate is used, the transfer surface 14 is roughened by chemical polishing such as soft etching with a mixed acid of nitric acid and hydrofluoric acid or an etching solution such as a ferric chloride solution. It is preferable to adjust the adhesion strength between the material 13 and the conductor circuit 3 in advance. Specifically, the surface roughness Ra of the transfer base material 13 is preferably set to 2 μm or less by the above-described treatment, and more preferably set to 0.1 to 0.5 μm. . In this way, when the conductor circuit 3 is formed on the transfer substrate 13 by plating or the like, it is possible to secure a certain degree of adhesion between the transfer substrate 13 and the conductor circuit 3, and during solder reflow heating. For example, the conductor circuit 3 can be prevented from being inadvertently peeled off from the transfer substrate 13, and the conductor circuit 3 can be removed when the transfer substrate 13 is peeled off from the resin layer 1 during the transfer of the conductor circuit 3. The resin layer 1 can be reliably left.

  Next, as shown in FIG. 1B, the transfer base 13 provided with only the conductor circuit 3 in advance, and the transfer base 13 described above in which the female connector forming component 15 is disposed, The B-stage (semi-cured state) resin layer 1 is disposed between the two transfer base materials 13 and the transfer surface 14 of each transfer base material 13 is opposed to the surface of the resin layer 1 so that the resin A transfer substrate 13 is laminated on both sides of the layer 1. At this time, if the female connector forming component 15 provided with the cap 47 is used, the cap 47 is attached to the female connector forming component 15 and the opening 50 is covered before the lamination. It is preferable to keep it. This is because the resin of the resin layer 1 melted and softened in the molding process can be prevented from flowing into the hollow portion 46 of the female connector forming part 15 through the opening 50. The electrical component 4 may be disposed not only on one transfer substrate 13 but also on both transfer substrates 13.

  Here, the resin composition forming the resin layer 1 contains a resin component and an inorganic filler. As the resin component, a thermoplastic resin or a thermosetting resin can be used. Accordingly, a curing agent, a curing accelerator, a surface treatment agent, and the like can be blended. When using a thermosetting resin, a solvent can also be mix | blended for viscosity adjustment.

  Although it does not specifically limit as a thermosetting resin, A well-known epoxy resin, a phenol resin, cyanate resin etc. can be used, Among these, only 1 type is used individually or in mixture of 2 or more types. be able to. In addition, flame retardancy can be obtained by adding an additive type flame retardant. However, if a part or all of a thermosetting resin is brominated or phosphorus-modified, heat resistance and mechanical properties can be obtained. It is possible to improve the flame retardancy while maintaining sufficient strength.

  It does not specifically limit as a hardening | curing agent or a hardening accelerator, According to the thermosetting resin to be used, it can select from a well-known thing suitably and can be used. For example, when an epoxy resin is used as the thermosetting resin, a curing agent such as phenol novolac resin or dicyandiamide can be blended as the curing agent, and 2-ethyl-4-methylimidazole as the curing accelerator. And a curing accelerator such as triphenylphosphine can be blended.

  As the surface treatment agent, a coupling agent such as a silane coupling agent or a titanate coupling agent, or a dispersing agent such as a phosphate ester dispersant or an ether amine dispersant can be used. Thereby, the dispersibility of the inorganic filler in a resin composition can be improved.

  As the solvent, it is preferable to use a solvent having a low boiling point such as methyl ethyl ketone or acetone. This is because when such a low boiling point solvent is used, the shape of the surface of the resin layer 1 after drying becomes good. On the contrary, if a high boiling point solvent is used, there is a high possibility that the solvent does not volatilize sufficiently during drying, and it is likely that the solvent will remain and cause a decrease in electrical insulation and mechanical strength of the cured resin layer 1 (insulating substrate 2). There is a risk.

  By filling the resin composition with a high amount of the inorganic filler, the thermal expansion coefficient of the resin layer 1 formed from this resin composition can be reduced, and the thermal expansion coefficient of the conductor circuit 3 and the electrical component 4 can be matched. it can. It is preferable that the compounding quantity of an inorganic filler is 80-95 mass% with respect to the resin composition whole quantity (however, except a solvent). At this time, the thermal expansion coefficient of the cured resin layer 1 is 20 ppm / ° C. or less, and the above-described consistency can be further increased. When subjected to heat load, the resin layer 1 and the conductor circuit 3 Generation | occurrence | production of defects, such as peeling, damage of the electrical component 4, and a disconnection, can be prevented.

As the inorganic filler, aluminum oxide (Al ₂ O ₃ ), magnesium oxide (MgO), boron nitride (BN), aluminum nitride (AlN), silica (SiO ₂ ), titanium oxide (TiO ₂ ), aluminum borate (9Al ₂ O ₃ .2B ₂ O ₃ ) or the like can be used, and among these, only one type can be used alone or two or more types can be mixed and used.

  In addition, in order to adjust the fluidity | liquidity of the resin layer 1 at the time of shaping | molding, or to prevent the crack of the resin layer 1 after hardening, thermoplastic resins, such as a phenoxy resin, can also be mix | blended with a resin composition. .

  The resin composition can be obtained by kneading each of the above components into a slurry using a kneader and adjusting the viscosity to an optimum viscosity. Next, the resin composition thus obtained is applied to the surface of a carrier substrate (for example, a PET film, a rolled copper foil, etc.), and this is heated and dried to thereby form a B-stage sheet-like resin layer. 1 can be obtained. The heating and drying conditions at this time depend on the composition of the resin composition, but are preferably heated at 130 to 170 ° C. for 2 to 10 minutes. Moreover, it is preferable that the thickness of the resin layer 1 is 50-300 micrometers. The B-stage resin layer 1 obtained as described above can be used as the resin sheet 21 by peeling from the carrier substrate.

  Moreover, as the resin sheet 21, what is obtained by making a nonwoven fabric impregnate a slurry-like resin composition, and drying this can also be used. As a nonwoven fabric, a glass nonwoven fabric, an organic fiber nonwoven fabric, etc. can be used. Therefore, a prepreg used for producing a metal-clad laminate such as FR-4 (glass epoxy copper-clad laminate) is also included in the resin sheet 21 and can form the resin layer 1 of the present invention.

  In the case shown in FIG. 1B, the resin layer 1 composed of a single resin sheet 21 and the transfer base material 13 are laminated, but depending on the protruding dimensions of the electrical component 4 from the transfer surface 14, The resin layer 1 composed of two or more resin sheets 21 and the transfer substrate 13 may be laminated. And it integrates by performing heat press molding in the state laminated | stacked in this way.

In the molding process, the resin sheet 21 is first melted and softened. At this time, when a plurality of resin sheets 21 are laminated, the resin sheets 21 are integrated, and the melt-softened resin sheet 21 flows to form a conductor circuit formed on the transfer substrate 13. 3 and the electrical component 4 are embedded in the resin layer 1 formed of the resin sheet 21. At this time, when the underfill 19 is not filled in the gap between the electrical component 4 and the transfer substrate 13, the melted and softened resin sheet 21 flows, so that the resin is sufficiently contained in the gap. Molding is performed under such a condition that it is filled. Moreover, it is necessary to set the pressure at the time of molding according to the fluidity of the resin sheet 21 at the time of melt softening. For example, when the fluidity at the time of melt softening is high, it can be easily molded by a vacuum laminator, and when the fluidity at the time of melt softening is low, it is increased to about 2.94 MPa (30 kgf / cm ² ). It can be molded by pressing. Moreover, in order to embed the electric component 4 in the resin layer 1, it is preferable to gradually increase the pressure from the time when the resin sheet 21 is melted and softened. Moreover, it is preferable to perform this heating and pressing under reduced pressure or under vacuum. In this case, voids are less likely to be mixed into the resin layer 1 and the reliability is improved.

  Moreover, although the heating temperature in said shaping | molding process is based also on the composition of the resin composition which comprises the resin layer 1, it is preferable that it is 100-180 degreeC. More specifically, the molding temperature during melt softening is preferably 100 to 130 ° C., and the molding and curing temperature after embedding is preferably 160 to 180 ° C. By this heating, the B-stage resin layer 1 is cured to become the C-stage resin layer 1, whereby the insulating substrate 2 is formed.

  Next, as shown in FIG. 1 (c), the conductor circuit 3, the electrical component 4 and the female connector forming component 15 are embedded in the resin layer 1, and then, as shown in FIG. By peeling only the transfer base material 13 from the layer 1, the conductor circuit 3, the electrical component 4, and the female connector forming component 15 remain in the resin layer 1. The transfer substrate 13 can be peeled off by peeling off the end of the resin layer 1 while bending the transfer substrate 13. The substrate 13 for transfer after peeling can be used again for the manufacture of the electric component built-in circuit board A if it is cleaned by acid cleaning or the like.

  Further, if necessary, by irradiating with a laser beam or drilling, a through hole 51 penetrating the resin layer 1 and the conductor circuit 3 on both sides thereof is formed, and inside the through hole 51. By filling the conductive paste 52, the conductor circuits 3 on both sides of the resin layer 1 may be conducted. Then, as shown in FIG. 1 (d), the conductor circuit 3 is exposed on the surface of the resin layer 1, and the electrical component 4 and the female connector forming component 15 are embedded in the resin layer 1. The resin layer 1 is cut in the thickness direction so as to pass through the hollow portion 46 of the connector forming part 15. This cutting can be performed using a diamond cutter or a router. In FIG.1 (d), a cutting location is shown with a dashed-dotted line. By cutting in this way, the concave portion 6 of the female connector forming component 15 can be opened on the side surface of the resin layer 1, and the electric component built-in circuit board A as shown in FIG. Can do. The electric component built-in circuit board A thus obtained has the following characteristics. That is, the conductor circuit 3 is exposed and formed on the surface of the resin layer 1, and the outer surface of the resin layer 1 and the exposed surface of the conductor circuit 3 are flush with each other so that the surface ( Are formed flat without unevenness. In addition, an electrical component 4 electrically connected to the conductor circuit 3 is embedded in the resin layer 1. Further, the recess 6 of the female connector 8 is opened on the side surface of the resin layer 1.

  Here, in the electric component built-in circuit board A shown in FIG. 1 (e), the conductor circuit 3 is exposed on the surface of the insulating substrate 2, so that the conductor circuit 3 is exposed as shown in FIG. 1 (f). The insulating layer 10 for circuit protection may be formed by adhering the above-described resin sheet 21 to the surface on the side where the circuit protection is performed. Then, the conductor circuit 3 can be protected by the circuit protection insulating layer 10. The insulating layer 10 for circuit protection may be formed on the entire surface (both sides and side surfaces) of the electric component built-in circuit board A except for the recess 6 of the female connector 8. In addition, on the surface of the circuit protection insulating layer 10, the product name, model, serial number, etc. can be displayed.

  FIG. 1G also shows another example of the electric component built-in circuit board A. In this electric component built-in circuit board A, an electromagnetic shielding metal layer 11 is formed by sticking a metal foil such as a copper foil on the surface of the insulating substrate 2 or performing a plating process such as copper plating. Yes. In this way, the electromagnetic shielding metal layer 11 can obtain an electromagnetic shielding effect and prevent electromagnetic interference. In FIG. 1G, the electromagnetic shielding metal layer 11 is formed via circuit protection insulating layers 10 formed on both surfaces of the insulating substrate 2. Further, the electromagnetic shielding metal layer 11 can be formed on the entire surface (both sides and side surfaces) of the electric component built-in circuit board A except for the recess 6 of the female connector 8.

  As described above, in the electric component built-in circuit board A shown in FIG. 1, the insulating substrate 2 is formed by the single resin layer 1, and the conductor circuit 3 is formed on both surfaces of the single resin layer 1. The electrical component 4 electrically connected to is embedded in one resin layer 1. Thus, by incorporating the electrical component 4 in the insulating substrate 2, it is possible to reduce the size while increasing the mounting amount of the electrical component 4. Moreover, since the mountable position of the electrical component 4 is expanded, the degree of freedom in wiring design is also increased. Further, in the electric component built-in circuit board A shown in FIG. 1, the recess 6 is formed on the side surface of the insulating substrate 2, and the connection terminal 5 electrically connected to the conductor circuit 3 is provided on the inner surface 7 of the recess 6. A female connector 8 is formed. Therefore, even if the number of connection terminals 5 is increased as compared with the conventional case, all of these connection terminals 5 can be provided on the inner surface 7 of the recess 6 and are not bulky and cause no bulging. It can be taken in and out with the outside. Therefore, it is easy to manufacture an IC card or the like that is convenient for carrying, and further miniaturization is possible. In order to exchange information with the outside, a male connector (not shown) provided in an external device serving as an information supply source / storage source is connected to the female connector 8 of the electric component built-in circuit board A. Can be done. In the present invention, the one or both surfaces of the resin layer 1 mean a surface that can be visually recognized from the outside, and also a surface that cannot be visually recognized from the outside, that is, an interface between different resin layers 1. The same applies to the following.

  Further, according to the method for manufacturing the electric component built-in circuit board A described above, the resin layer 1 of the B stage is melted and softened, and the resin composition constituting the resin layer 1 flows to fill the gap. It is possible to prevent a gap from being generated around the electrical component 4. Therefore, air does not remain around the electrical component 4, so even if the electrical component built-in circuit board A receives a load due to heat, the insulating substrate 2 is cracked or the electrical component 4 is damaged due to thermal expansion of the air. The occurrence of defects such as disconnection can be suppressed. In addition, the electric component 4 can be arranged at an arbitrary position inside the insulating substrate 2 by melting and softening the resin layer 1 regardless of the mounting amount and mounting position of the electric component 4 without going through complicated steps. It can be done.

  1 (e) to 1 (g), there is room for alternately laminating insulating layers and conductor layers on both surfaces of the electric component built-in circuit board A, so a known build-up method is performed. Thus, a multi-layer can be achieved. That is, the electric component built-in circuit board A obtained as described above can be used as the core material 23. FIG. 2 shows an example of this multilayering process. In this process, the circuit board A with a built-in electrical component shown in FIG. 1 (e) is used. First, as shown in FIG. The core material 23 and the metal foil-attached resin sheet 24 are laminated with both surfaces of the material 23 facing the resin layer 1 side of the resin sheet 24 with the metal foil. And it integrates by performing heat press molding in the state laminated | stacked in this way. In this molding process, the B-stage resin layer 1 is melted and then cured, so that the interface between the core material 23 and the metal foil-attached resin sheet 24 is joined and integrated. In addition, said heat press molding can be performed on the same conditions as the above-mentioned case.

  Here, the resin sheet 24 with metal foil is formed by providing the B-stage resin layer 1 on one side of the metal foil 25. As the metal foil 25, for example, copper foil or the like can be used. . The thickness of the metal foil 25 is preferably 10 to 150 μm. The surface of the metal foil 25 on which the resin layer 1 is formed is preferably a rough surface in order to improve the adhesion with the resin layer 1. For example, when an electrolytic copper foil is used as the metal foil 25, the resin layer 1 can be formed on the rough surface originally formed on the electrolytic copper foil. Further, the metal foil 25 can be subjected to a surface treatment. Examples of the surface treatment include a roughening treatment such as a blackening treatment and an alumite treatment. On the other hand, the resin layer 1 constituting the resin sheet with metal foil 24 can be formed using the resin composition described above. And the resin sheet 24 with a metal foil can be obtained by apply | coating a resin composition to the single side | surface (rough surface) of the metal foil 25, drying this, and forming the resin layer 1 of a B stage.

  After the core material 23 and the metal foil-attached resin sheet 24 are integrated, as shown in FIG. 2 (b), the outer metal foil 25 is irradiated with laser light or drilled. A non-through hole 26 that penetrates only the metal foil 25 and the resin layer 1 therebelow is formed. The non-through hole 26 is formed at a predetermined position with respect to the conductor circuit 3 formed in the electric component built-in circuit board A which is the core material 23. The surface of the conductor circuit 3 is exposed at the bottom surface of the non-through hole 26.

  Next, the non-through hole 26 is washed by a general desmear process to remove the resin residue, and then a hole plating 27 is formed on the inner surface of the non-through hole 26. A hole plating 27 is formed on the inner surface of the non-through hole 26. As the hole plating 27, copper plating or the like can be formed. Specifically, after performing electroless copper plating, hole plating 27 can be formed by performing electrolytic copper plating as necessary. The non-through hole 26 in which the hole plating 27 is formed may be filled with a conductive paste 52.

  Next, the conductor circuit 3 is formed by etching the outer layer metal foil 25. At this time, the non-through hole 26 in which the hole plating 27 is formed is formed as a via hole 28 that conducts between the conductor circuits 3 formed in different layers. By forming the resin layer 1 and the conductor circuit 3 alternately and repeatedly, further multilayering can be achieved. The inside of the non-through hole 26 in which the hole plating 27 is formed is filled with a conductive paste 52, or the inside of the non-through hole 26 is filled with the hole plating 27 itself by plating thickening. Also good.

  Then, as shown in FIG. 2B, the conductor circuit 3 is formed on the surface of the resin layer 1 so as to be exposed, and the electrical component 4 and the female connector forming component 15 are embedded in the resin layer 1. The resin layer 1 is cut in the thickness direction so as to pass through the hollow portion 46 of the connector forming part 15. This cutting can be performed using a diamond cutter or a router. In FIG. 2B, the cut portion is indicated by a one-dot chain line. By cutting in this way, the concave portion 6 of the female connector forming component 15 can be opened on the side surface of the resin layer 1, and a multilayered electric component built-in circuit board A as shown in FIG. Can be manufactured. The multilayering by the build-up method is not limited to the method using the resin sheet 24 with the metal foil as described above. For example, the resin composition is directly formed on the surface of the insulating substrate 2 on which the conductor circuit 3 is formed. The resin layer 1 may be formed by applying an object, or the conductor circuit 3 may be formed by plating. In forming the via hole 28 in the resin layer 1, after forming the non-through hole 26, the conductive paste 52 may be filled and cured without forming the hole plating 27.

  Here, in the electric component built-in circuit board A shown in FIG. 2C, since the conductor circuit 3 is exposed on the surface of the insulating substrate 2, the conductor circuit 3 is formed in the same manner as in FIG. The circuit protection insulating layer 10 (not shown) may be formed by adhering the above-described resin sheet 21 to the exposed surface. Then, the conductor circuit 3 can be protected by the circuit protection insulating layer 10. At this time, a part of the resin constituting the circuit protection insulating layer 10 is filled in the non-through hole 26 in which the hole plating 27 is formed. The insulating layer 10 for circuit protection can be formed on the entire surface (both sides and side surfaces) of the electric component built-in circuit board A except for the recess 6 of the female connector 8. In addition, on the surface of the circuit protection insulating layer 10, the product name, model, serial number, etc. can be displayed.

  Further, as in the case of FIG. 1 (g), by sticking a metal foil such as a copper foil on both surfaces of the insulating substrate 2 of the electric component built-in circuit board A, or performing a plating process such as copper plating, An electromagnetic shielding metal layer 11 (not shown) may be formed. In this way, the electromagnetic shielding metal layer 11 can obtain an electromagnetic shielding effect and prevent electromagnetic interference. The electromagnetic shielding metal layer 11 can be formed on the entire surface (both sides and side surfaces) of the electric component built-in circuit board A except for the recess 6 of the female connector 8.

  As described above, in the electric component built-in circuit board A shown in FIG. 2, the insulating substrate 2 is formed by laminating the plurality of resin layers 1, and the three resin layers 1 (according to FIG. 2C) The conductor circuit 3 is formed on one resin layer 1 in which the component 4 is embedded and two resin layers 1 derived from the resin sheet 24 with metal foil), and is electrically connected to the conductor circuit 3. A component 4 is embedded in one resin layer 1. Thus, by incorporating the electrical component 4 in the insulating substrate 2, it is possible to reduce the size while increasing the mounting amount of the electrical component 4. Moreover, since the mountable position of the electrical component 4 is expanded, the degree of freedom in wiring design is also increased. Furthermore, in the electric component built-in circuit board A shown in FIG. 2, the recess 6 is formed on the side surface of the insulating substrate 2, and the connection terminal 5 electrically connected to the conductor circuit 3 is provided on the inner surface 7 of the recess 6. A female connector 8 is formed. Therefore, even if the number of connection terminals 5 is increased as compared with the conventional case, all of these connection terminals 5 can be provided on the inner surface 7 of the recess 6 and are not bulky and cause no bulging. It can be taken in and out with the outside. Therefore, it is easy to manufacture an IC card or the like that is convenient for carrying, and further miniaturization is possible. In order to exchange information with the outside, a male connector (not shown) provided in an external device serving as an information supply source / storage source is connected to the female connector 8 of the electric component built-in circuit board A. Can be done.

  Further, according to the method for manufacturing the electric component built-in circuit board A described above, the resin layer 1 of the B stage is melted and softened, and the resin composition constituting the resin layer 1 flows to fill the gap. It is possible to prevent a gap from being generated around the electrical component 4. Therefore, air does not remain around the electrical component 4, so even if the electrical component built-in circuit board A receives a load due to heat, the insulating substrate 2 is cracked or the electrical component 4 is damaged due to thermal expansion of the air. The occurrence of defects such as disconnection can be suppressed. In addition, the electric component 4 can be arranged at an arbitrary position inside the insulating substrate 2 by melting and softening the resin layer 1 regardless of the mounting amount and mounting position of the electric component 4 without going through complicated steps. It can be done.

  FIG. 3 also shows another example of the electric component built-in circuit board A. In the electric component built-in circuit board A, the electric component 4 is mounted on the surface of the outermost layer, thereby achieving further higher integration. Specifically, the insulating substrate 2 shown in FIG. 2B is used, and this is further multilayered by the build-up method described above, and then the electrical component 4 is mounted on the outermost conductor circuit 3. Thereafter, the resin layer 1 is cut in the thickness direction so as to pass through the hollow portion 46 of the female connector forming part 15. This cutting can be performed using a diamond cutter or a router. In FIG. 3A, the cut portion is indicated by a one-dot chain line. By cutting in this way, the concave portion 6 of the female connector forming component 15 can be opened on the side surface of the resin layer 1, and the electric component built-in circuit board A as shown in FIG. 3B is manufactured. Can do. However, the size and number of the electrical components 4 mounted on the outermost layer of the electrical component built-in circuit board A are set within a range that does not impair the object of the present invention.

  FIG. 4 shows another example of the manufacturing process of the electric component built-in circuit board A according to the present invention. In this process, first, the conductor circuit 3 is provided on one surface (transfer surface 14) of the transfer substrate 13. . Examples of the method for forming the conductor circuit 3 on the transfer substrate 13 include the methods described above.

  Next, as shown in FIG. 4 (a), the electrical component 4 and the female connector forming component 15 are disposed on the transfer surface 14 of the transfer substrate 13, and the size is approximately the same as that of the electrical component 4. A silicon heat-dissipating resin sheet 12 having the above is provisionally bonded with a known adhesive. As the electrical component 4, the above-described one can be used, and the electrical component 4 can be electrically connected to the conductor circuit 3 by being mounted by the above-described method. Further, as the female connector forming part 15, the above-described one can be used, and this can be electrically connected to the conductor circuit 3 by the method described above. Here, as shown in FIG. 4A, before the connection with the solder 17, the cap 47 is removed from the female connector forming component 15 for the same reason as in FIG. Is preferred. Moreover, as the silicon thermal radiation resin sheet 12, if it is a product made from silicone and excellent in heat conductivity and a softness | flexibility, it will not specifically limit, A well-known thing can be used.

  Specific examples of the transfer substrate 13, the adhesion strength (peeling strength) between the transfer substrate 13 and the conductor circuit 3, the surface roughness Ra of the transfer substrate 13, and the like are also as described above.

  In the step shown in FIG. 4, a metal-clad laminate such as FR-4 (glass epoxy copper-clad laminate) is used. Then, by performing a subtractive method or the like, the printed circuit board 29 is manufactured by forming the conductor circuit 3 and the through-hole plating 42 on the metal-clad laminate, and the conductor circuit 3 of the printed circuit board 29 is further electrically connected. The component 4 is mounted. As the electrical component 4, the above-described one can be used, and the electrical component 4 can be electrically connected to the conductor circuit 3 by being mounted by the above-described method.

  Next, as shown in FIG. 4A, the B-stage (semi-cured state) resin layer 1 is disposed between the printed wiring board 29 and the transfer base material 13, and the printed wiring board 29 The printed circuit board 29 is laminated on one side of the resin layer 1 with the surface on which the electrical component 4 is mounted and the transfer surface 14 of the transfer base material 13 facing the surface of the resin layer 1, respectively. A transfer substrate 13 is laminated on the other side of the layer 1. At this time, for the same reason as in FIG. 1B, it is preferable to attach the cap 47 to the female connector forming part 15 and cover the opening 50. Furthermore, among the electric components 4 mounted on the printed wiring board 29, the electric components 4 (for example, active components such as an IC) that are required to improve heat dissipation, and the silicon heat-dissipating resin sheet provided on the transfer substrate 13 are used. 12 is made to oppose through the resin layer 1. Here, as the resin layer 1 of the B stage, the resin sheet 21 made of the above-described resin composition can be used. Note that a plurality of silicon heat-dissipating resin sheets 12 may be provided on the transfer base 13 in advance so that the silicon heat-dissipating resin sheets 12 can be opposed to all the electrical components 4 mounted on the printed wiring board 29. Good.

  In FIG. 4A, the resin layer 1 composed of a single resin sheet 21, the printed wiring board 29, and the transfer base material 13 are laminated, but the electrical component 4 protrudes from the transfer surface 14. Depending on the dimensions, the resin layer 1 composed of two or more resin sheets 21, the printed wiring board 29, and the transfer substrate 13 may be laminated. And it integrates by performing heat press molding in the state laminated | stacked in this way. As shown in FIG. 4B, this integration is performed until at least the opposing silicon heat radiation resin sheet 12 and the electrical component 4 are in contact with each other.

In the molding process, the resin sheet 21 is first melted and softened. At this time, when a plurality of resin sheets 21 are laminated, the resin sheets 21 are integrated, and the melt-softened resin sheet 21 flows to form a conductor circuit formed on the transfer substrate 13. 3 and the electrical component 4 are embedded in the resin layer 1 formed of the resin sheet 21. At this time, when the underfill 19 is not filled in the gap between the electrical component 4 and the transfer substrate 13, the melted and softened resin sheet 21 flows, so that the resin is sufficiently contained in the gap. Molding is performed under such a condition that it is filled. Moreover, it is necessary to set the pressure at the time of molding according to the fluidity of the resin sheet 21 at the time of melt softening. For example, when the fluidity at the time of melt softening is high, it can be easily molded by a vacuum laminator, and when the fluidity at the time of melt softening is low, it is increased to about 2.94 MPa (30 kgf / cm ² ). It can be molded by pressing. Moreover, in order to embed the electric component 4 in the resin layer 1, it is preferable to gradually increase the pressure from the time when the resin sheet 21 is melted and softened. Moreover, it is preferable to perform this heating and pressing under reduced pressure or under vacuum. In this case, voids are less likely to be mixed into the resin layer 1 and the reliability is improved.

  Moreover, although the heating temperature in said shaping | molding process is based also on the composition of the resin composition which comprises the resin layer 1, it is preferable that it is 100-180 degreeC. More specifically, the molding temperature during melt softening is preferably 100 to 130 ° C., and the molding and curing temperature after embedding is preferably 160 to 180 ° C. By this heating, the B-stage resin layer 1 is cured to become the C-stage resin layer 1, whereby the insulating substrate 2 is formed.

  Next, after embedding the conductor circuit 3, the electrical component 4, the female connector forming component 15, and the silicon heat dissipation resin sheet 12 in the resin layer 1, only the transfer base material 13 is peeled from the resin layer 1, The conductor circuit 3, the electrical component 4, the female connector forming component 15 and the silicon heat radiation resin sheet 12 are left on the resin layer 1. Then, as shown in FIG. 4B, the conductive circuit 3 is formed on the surface of the resin layer 1 so as to be exposed, and the electrical component 4 and the female connector forming component 15 are embedded in the resin layer 1. The resin layer 1 is cut in the thickness direction so as to pass through the hollow portion 46 of the connector forming part 15. This cutting can be performed using a diamond cutter or a router. In FIG.4 (b), a cutting location is shown with a dashed-dotted line. By cutting in this way, the concave portion 6 of the female connector forming component 15 can be opened on the side surface of the resin layer 1, and a circuit board A with built-in electrical components as shown in FIG. 4C is manufactured. Can do. In this electric component built-in circuit board A, the silicon heat radiating resin sheet 12 is disposed in contact with the electric component 4 and is exposed on the surface of the resin layer 1, so that heat dissipation can be improved. As a result, the functional deterioration of the electrical component 4 can be prevented.

  Here, in order to further enhance the heat dissipation of the electric component built-in circuit board A shown in FIG. 4C, the heat dissipating fins 30 are arranged in contact with the silicon heat dissipating resin sheet 12, as shown in FIG. 4D. You may make it do. However, as the radiating fins 30, those having a size within a range not impairing the object of the present invention are used.

  In the electric component built-in circuit board A shown in FIG. 4C, the conductor circuit 3 is exposed on the surface of the insulating substrate 2, so that the conductor circuit 3 is exposed as shown in FIG. The insulating layer 10 for circuit protection may be formed by adhering the above-described resin sheet 21 to the surface on the side where the circuit is protected. Then, the conductor circuit 3 can be protected by the circuit protection insulating layer 10. The insulating layer 10 for circuit protection can be formed on the entire surface (both sides and side surfaces) of the electric component built-in circuit board A except for the recess 6 of the female connector 8. In addition, on the surface of the circuit protection insulating layer 10, the product name, model, serial number, etc. can be displayed.

  Although not shown, the electromagnetic shielding metal layer 11 may be formed on one side or both sides of the insulating substrate 2 with the circuit protection insulating layer 10 interposed therebetween. In this way, the electromagnetic shielding metal layer 11 can obtain an electromagnetic shielding effect and prevent electromagnetic interference. The electromagnetic shielding metal layer 11 can be formed on the entire surface (both sides and side surfaces) of the electric component built-in circuit board A except for the recess 6 of the female connector 8.

  4 (c) and 4 (d), there is room for alternately laminating insulating layers and conductor layers on the surface where the silicon heat radiating resin sheet 12 and the heat radiating fins 30 are not provided. Therefore, it is possible to increase the number of layers by performing a known build-up method.

  As described above, in the electric component built-in circuit board A shown in FIG. 4, the insulating substrate 2 is formed by laminating the plurality of resin layers 1, and the two resin layers 1 (according to FIG. 4D) The conductor circuit 3 is formed on the resin layer 1 in which the component 4 is embedded and the resin layer 1 derived from the printed wiring board 29), and the electrical component 4 electrically connected to the conductor circuit 3 is one resin. Embedded in layer 1. Thus, by incorporating the electrical component 4 in the insulating substrate 2, it is possible to reduce the size while increasing the mounting amount of the electrical component 4. Moreover, since the mountable position of the electrical component 4 is expanded, the degree of freedom in wiring design is also increased. Furthermore, in the electric component built-in circuit board A shown in FIG. 4, the recess 6 is formed on the side surface of the insulating substrate 2, and the connection terminal 5 electrically connected to the conductor circuit 3 is provided on the inner surface 7 of the recess 6. A female connector 8 is formed. Therefore, even if the number of connection terminals 5 is increased as compared with the conventional case, all of these connection terminals 5 can be provided on the inner surface 7 of the recess 6 and are not bulky and cause no bulging. It can be taken in and out with the outside. Therefore, it is easy to manufacture an IC card or the like that is convenient for carrying, and further miniaturization is possible. In order to exchange information with the outside, a male connector (not shown) provided in an external device serving as an information supply source / storage source is connected to the female connector 8 of the electric component built-in circuit board A. Can be done.

  FIG. 5 also shows the manufacturing process of the electric component built-in circuit board A, but the transfer base material 13 is not used in this process. That is, in this process, first, the conductor circuit 3 and the through-hole plating 42 are formed as necessary on a metal-clad laminate such as FR-4 (glass epoxy copper-clad laminate) by performing a subtractive method or the like. Thus, the printed wiring board 29 is manufactured. In the one shown in FIG. 5, two printed wiring boards, that is, a single-sided printed wiring board (single-sided board 31) having a conductor circuit 3 formed on one side and a double-sided printed wiring board (double-sided board 32) having a conductor circuit 3 formed on both sides thereof. 29 is used. Then, the female connector forming component 15 and the electrical component 4 are disposed on the single-sided plate 31 in the same manner as the electrical component 4 and the female connector forming component 15 are disposed on the transfer substrate 13. Here, the female connector forming part 15 shown in FIG. 5 is formed as a rectangular parallelepiped casing 48 which is thinner than those shown in FIGS. However, since the casing 48 is formed to have a wide width (in the direction perpendicular to the paper surface in FIG. 5), the casing 48 is required for exchanging a large amount of signals even if the thickness is small. Only a plurality of connection terminals 5 can be provided. Further, by sticking the entire surface of one side of the casing 48 to the surface of the single-sided plate 31, no gap is formed between the female connector forming component 15 and the single-sided plate 31. Thereby, there exists an advantage that the thickness of the circuit board A whole electric component finally obtained can be made thinner. Each connection terminal 5 is electrically connected to a plurality of leads 20 provided on the outer surface (side surface) of the casing 48, and a part of the casing 48 has the same or different kind as described above. By filling the insulating resin 49, insulation between the connection terminals 5 is secured and each connection terminal 5 is fixed. As shown in FIG. 5A, the electrical connection between the connection terminal 5 of the female connector forming component 15 and the conductor circuit 3 of the single-sided plate 31 is performed between the female connector-forming component 15 and the single-sided plate 31. Since the connection is not performed in the gap, the connection state can be easily visually recognized from the outside, and thus it is possible to easily confirm whether the female connector forming component 15 is mounted on the single-sided plate 31. It can be done. Further, a hollow portion 46 is formed in the remaining portion of the housing 48, and each connection terminal 5 protrudes into the hollow portion 46 from the surface of the insulating resin 49 filling a part of the housing 48. Yes. It is preferable that an opening 50 is provided in a part of the casing 48 forming the hollow portion 46, and a removable cap 47 is provided in the opening 50.

  Next, as shown in FIG. 5A, the B-stage (semi-cured state) resin layer 1 is disposed between the single-sided plate 31 and the double-sided plate 32, and the conductor circuit 3 is placed on the double-sided plate 32. The formed side surface and the surface on which the female connector forming component 15 and the electrical component 4 are disposed on the single-sided plate 31 are respectively opposed to the surface of the resin layer 1, and both surfaces are formed on one side of the resin layer 1. A plate 32 is laminated, and a single-sided plate 31 is laminated on the other side of the resin layer 1. Here, as the resin layer 1 of the B stage, the resin sheet 21 made of the above-described resin composition can be used. Before the lamination, it is preferable to attach the cap 47 to the female connector forming part 15 and cover the opening 50 for the same reason as in FIG.

  In the case shown in FIG. 5A, the resin layer 1 composed of a single resin sheet 21 and the printed wiring board 29 are laminated, but depending on the protruding dimension of the electrical component 4 from the printed wiring board 29, The resin layer 1 composed of two or more resin sheets 21 and the printed wiring board 29 may be laminated. And it integrates by performing heat press molding in the state laminated | stacked in this way.

In the molding process, the resin sheet 21 is first melted and softened. At this time, when a plurality of resin sheets 21 are laminated, the resin sheets 21 are integrated, and the melted and softened resin sheet 21 flows, so that the conductor circuit 3 formed on the single-sided plate 31 and The electric component 4 is embedded in the resin layer 1 formed of the resin sheet 21. At this time, when the underfill 19 is not filled in the gap between the electrical component 4 and the single-sided plate 31, the melted and softened resin sheet 21 flows, so that the gap is sufficiently filled with the resin. The molding is performed under such conditions. Moreover, it is necessary to set the pressure at the time of molding according to the fluidity of the resin sheet 21 at the time of melt softening. For example, when the fluidity at the time of melt softening is high, it can be easily molded by a vacuum laminator, and when the fluidity at the time of melt softening is low, it is increased to about 2.94 MPa (30 kgf / cm ² ). It can be molded by pressing. Moreover, in order to embed the electric component 4 in the resin layer 1, it is preferable to gradually increase the pressure from the time when the resin sheet 21 is melted and softened. Moreover, it is preferable to perform this heating and pressing under reduced pressure or under vacuum. In this case, voids are less likely to be mixed into the resin layer 1 and the reliability is improved.

  Moreover, although the heating temperature in said shaping | molding process is based also on the composition of the resin composition which comprises the resin layer 1, it is preferable that it is 100-180 degreeC. More specifically, the molding temperature during melt softening is preferably 100 to 130 ° C., and the molding and curing temperature after embedding is preferably 160 to 180 ° C. By this heating, the B-stage resin layer 1 is cured to become the C-stage resin layer 1, whereby the insulating substrate 2 is formed.

  Next, as shown in FIG. 5B, the conductor circuit 3, the electrical component 4 and the female connector forming component 15 are embedded in the resin layer 1, and then passed through the hollow portion 46 of the female connector forming component 15. The resin layer 1 is cut in the thickness direction. This cutting can be performed using a diamond cutter or a router. In FIG.5 (b), a cutting location is shown with a dashed-dotted line. By cutting in this way, the concave portion 6 of the female connector forming component 15 can be opened on the side surface of the resin layer 1, and the electric component built-in circuit board A as shown in FIG. 5C is manufactured. Can do.

  In the case shown in FIG. 5C, the conductor circuit 3 is exposed on the surface of the insulating substrate 2. Therefore, as shown in FIG. 5D, the surface on the side where the conductor circuit 3 is exposed. The circuit protection insulating layer 10 may be formed by sticking the above-described resin sheet 21 to the substrate. Then, the conductor circuit 3 can be protected by the circuit protection insulating layer 10. The insulating layer 10 for circuit protection can be formed on the entire surface (both sides and side surfaces) of the electric component built-in circuit board A except for the recess 6 of the female connector 8. In addition, on the surface of the circuit protection insulating layer 10, the product name, model, serial number, etc. can be displayed.

  Although not shown, the electromagnetic shielding metal layer 11 may be formed on one side or both sides of the insulating substrate 2 with the circuit protection insulating layer 10 interposed therebetween. In this way, the electromagnetic shielding metal layer 11 can obtain an electromagnetic shielding effect and prevent electromagnetic interference. The electromagnetic shielding metal layer 11 may be formed on the entire surface of the printed wiring board on which the conductor circuit 3 is not originally formed. Further, the electromagnetic shielding metal layer 11 can be formed on the entire surface (both sides and side surfaces) of the electric component built-in circuit board A except for the recess 6 of the female connector 8.

  In the case shown in FIG. 5 (b), there is room for alternately laminating insulating layers and conductor layers on both sides, so that a multilayer can be achieved by performing a known build-up method. It is.

  As described above, in the electric component built-in circuit board A shown in FIG. 5, the insulating substrate 2 is formed by laminating the plurality of resin layers 1, and the two resin layers 1 (according to FIG. 5D) The conductor circuit 3 is formed on the resin layer 1 in which the component 4 is embedded and the resin layer 1 derived from the double-sided board 32), and the electrical component 4 electrically connected to the conductor circuit 3 is one resin layer. 1 is buried. Thus, by incorporating the electrical component 4 in the insulating substrate 2, it is possible to reduce the size while increasing the mounting amount of the electrical component 4. Moreover, since the mountable position of the electrical component 4 is expanded, the degree of freedom in wiring design is also increased. Further, in the electric component built-in circuit board A shown in FIG. 5, the recess 6 is formed on the side surface of the insulating substrate 2, and the connection terminal 5 electrically connected to the conductor circuit 3 is provided on the inner surface 7 of the recess 6. A female connector 8 is formed. Therefore, even if the number of connection terminals 5 is increased as compared with the conventional case, all of these connection terminals 5 can be provided on the inner surface 7 of the recess 6 and are not bulky and cause no bulging. It can be taken in and out with the outside. Therefore, it is easy to manufacture an IC card or the like that is convenient for carrying, and further miniaturization is possible. In order to exchange information with the outside, a male connector (not shown) provided in an external device serving as an information supply source / storage source is connected to the female connector 8 of the electric component built-in circuit board A. Can be done.

  FIG. 6 shows an example of connecting the electrical component built-in circuit boards A to each other. In connecting the electrical component built-in circuit boards A to each other, the following connection body 34 can be used. That is, the connection body 34 has a plurality of male connectors 35 facing the same side, and each male connector 35 is provided with the same number of connection terminals 36 as the connection terminals 5 of the female connector 8. Is formed. Further, each male connector 35 of the connection body 34 is formed so as to be fitted and housed in the recess 6 of the female connector 8. For example, as shown in FIG. 6 (a), when connecting the three electrical component built-in circuit boards A having the female connector 8 formed on the side surface, first, as shown in FIG. 6 (b). After all the female connectors 8 are aligned in the same direction and the electric component built-in circuit boards A are stacked, as shown in FIG. 6 can be performed. Then, as shown in FIG. 6 (c), the male connector 35 of the connection body 34 is fitted and housed in the recess 6 of the female connector 8, thereby connecting the circuit boards A with built-in electrical components without gaps. Thus, a plurality of electric component built-in circuit boards A can be obtained as a compact assembly of modules. The electrical connection between the plurality of electric component built-in circuit boards A is taken by the connection body 34 described above. In the electric component built-in circuit board A shown in FIG.

  FIG. 7 shows another example of the electric component built-in circuit board A according to the present invention. In this electric component built-in circuit board A, in order to exchange signals by optical communication, the connection terminals 5 are formed by light receiving and emitting elements 9 (light receiving elements and light emitting elements). Other configurations are the same as those described above. 7A, the light emitting / receiving element 9 can be provided in the recess 6 of the female connector 8, so that the light receiving / emitting element 9 such as an LED is provided on the outermost layer of the printed wiring board as in the prior art. There is no need to install. Further, as the light receiving / emitting element 9 is provided in the recess 6 of the female connector 8 as described above, the lens 38 for efficiently condensing the light of the light receiving / emitting element 9 is also made of, for example, a transparent resin. Since the element 9 is sealed, it can be provided in the concave portion 6 of the female connector 8, so that a reflector, a lens, a phosphor, etc. are also used to efficiently collect the LED light as in the conventional case. There is no need to attach to the outer layer of the. Therefore, an area where other components are mounted can be ensured, and large-capacity signals can be exchanged by optical communication.

  Here, when information is exchanged with the outside by optical communication, it can be performed by connecting an optical fiber holder 39 as shown in FIGS. 7B and 7C to the female connector 8. The connection between the female connector 8 and the optical fiber holder 39 is performed by engaging a protruding piece 40 provided inward at the opening edge of the recess 6 and a receiving piece 41 provided on the optical fiber holder 39. Can do. When the female connector 8 and the optical fiber holder 39 are connected in this way, the respective end portions of the plurality of optical fibers 42 provided in the optical fiber holder 39 are opposed to the light receiving and emitting elements 9 provided in the recess 6. . Thereby, the light emitting / receiving element 9 can receive the optical signal transmitted from the external device (not shown) as the information supply source / storage source through the optical fiber 42, and conversely, the light transmitted from the light receiving / emitting element 9. The external device can receive the signal through the optical fiber 42. When the supply and storage of information is completed, the optical fiber holder 39 can be removed from the female connector 8 by releasing the engagement between the protruding piece 40 and the receiving piece 41.

An example of embodiment of this invention is shown and (a)-(g) is sectional drawing. The other example of embodiment of this invention is shown, (a)-(c) is sectional drawing. The other example of embodiment of this invention is shown, (a) (b) is sectional drawing. The other example of embodiment of this invention is shown, (a)-(d) is sectional drawing. The other example of embodiment of this invention is shown, (a)-(d) is sectional drawing. The other example of embodiment of this invention is shown, (a)-(c) is a schematic sectional drawing. The other example of embodiment of this invention is shown, (a) (b) is sectional drawing which expanded partially, (c) is a perspective view of (b).

Explanation of symbols

DESCRIPTION OF SYMBOLS A Circuit board with a built-in electrical component 1 Resin layer 2 Insulating substrate 3 Conductor circuit 4 Electrical component 5 Connection terminal 6 Recess 7 Inner surface 8 Female connector 9 Light emitting / receiving element 10 Circuit protection insulating layer 11 Electromagnetic shielding metal layer 12 Silicon heat radiation resin sheet 13 Transfer Substrate 14 Transfer Surface 15 Female Connector Forming Part 46 Hollow Part 47 Cap

Claims (6)

  An electrical component in which an insulating substrate is formed by a single resin layer or by laminating a plurality of resin layers, a conductor circuit is formed on one side or both sides of at least one resin layer, and is electrically connected to the conductor circuit Embedded in at least one resin layer, a recess is formed on the side surface of the insulating substrate, and a connection terminal electrically connected to the conductor circuit is provided on the inner surface of the recess to form a female connector. A circuit board with built-in electrical components, characterized by comprising:   2. The circuit board with a built-in electrical component according to claim 1, wherein the connection terminal is formed of a light emitting / receiving element.   The circuit board with a built-in electric component according to claim 1 or 2, wherein one selected from an insulating layer for circuit protection and a metal layer for electromagnetic shielding is formed on the surface of an insulating substrate.   4. The electric component built-in circuit board according to claim 1, wherein the silicon heat radiation resin sheet is disposed in contact with the electric component.   A conductor circuit is provided on the transfer surface of the transfer substrate, and an electrical component and a female connector forming part having a hollow portion are electrically connected to the conductor circuit and disposed on the transfer surface of the transfer substrate. In addition, the resin layer and the transfer substrate are laminated with the transfer surface of the transfer substrate facing the surface of the B-stage resin layer, and the conductor circuit, electrical component and female connector forming component are embedded in the resin layer. Next, by peeling only the transfer substrate from the resin layer, the conductive circuit was exposed on the surface of the resin layer, and the electrical component and the female connector forming component were embedded in the resin layer. After that, the resin layer is cut in the thickness direction so as to pass through the hollow portion of the female connector forming component, thereby opening the concave portion of the female connector forming component on the side surface of the resin layer. Circuit board manufacturing method.   6. The method of manufacturing a circuit board with built-in electrical parts according to claim 5, wherein the female connector forming part is provided with a removable cap provided with a hollow part.

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