WO2004014114A1 - 素子内蔵基板の製造方法および素子内蔵基板、ならびに、プリント配線板の製造方法およびプリント配線板 - Google Patents
素子内蔵基板の製造方法および素子内蔵基板、ならびに、プリント配線板の製造方法およびプリント配線板 Download PDFInfo
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- WO2004014114A1 WO2004014114A1 PCT/JP2003/007872 JP0307872W WO2004014114A1 WO 2004014114 A1 WO2004014114 A1 WO 2004014114A1 JP 0307872 W JP0307872 W JP 0307872W WO 2004014114 A1 WO2004014114 A1 WO 2004014114A1
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- transfer sheet
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- H—ELECTRICITY
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- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
- H05K1/182—Printed circuits structurally associated with non-printed electric components associated with components mounted in the printed circuit board, e.g. insert mounted components [IMC]
- H05K1/185—Components encapsulated in the insulating substrate of the printed circuit or incorporated in internal layers of a multilayer circuit
- H05K1/186—Components encapsulated in the insulating substrate of the printed circuit or incorporated in internal layers of a multilayer circuit manufactured by mounting on or connecting to patterned circuits before or during embedding
- H05K1/187—Components encapsulated in the insulating substrate of the printed circuit or incorporated in internal layers of a multilayer circuit manufactured by mounting on or connecting to patterned circuits before or during embedding the patterned circuits being prefabricated circuits, which are not yet attached to a permanent insulating substrate, e.g. on a temporary carrier
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Definitions
- the present invention relates to a method of manufacturing an element-embedded substrate, a method of manufacturing a printed wiring board, a method of manufacturing a printed wiring board, and a method of manufacturing a printed wiring board.
- the present invention relates to a method of manufacturing an element-embedded substrate capable of forming a fine pitch conductive pattern, a method of manufacturing a printed wiring board, and a printed wiring board.
- a multilayer printed wiring board which enables three-dimensional wiring routing by laminating printed wiring boards.
- Development of an element-embedded substrate with a further improvement in mounting efficiency is promoted by incorporating electronic components such as chip capacitors or electric elements such as semiconductor chips (hereinafter referred to collectively as “electric elements”).
- electric elements such as semiconductor chips
- a transfer method using a transfer sheet is conventionally known. In the process of producing a printed wiring board by this transfer method, mainly, after forming a conductor pattern on one surface of a transfer sheet, bonding the transfer sheet to the insulating layer through the formed conductor pattern, And a pattern transfer step of removing the transfer sheet.
- the printed wiring board manufactured by the transfer method can be easily multilayered by forming vias for interlayer connection anywhere in the insulating layer.
- Japanese Patent No. 3 05 1 070 discloses a method of manufacturing an element-embedded substrate using a transfer method.
- a method of manufacturing a conventional substrate with a built-in element will be described with reference to FIGS. 13A to 13F.
- FIG. 13A to 13F are process cross-sectional views showing the conventional method of manufacturing a device-incorporated substrate.
- the insulating base material 31 there are formed an air gap 32 for accommodating the semiconductor chip 36, and a via penetrating body 33 for interlayer connection configured by filling the through hole with the conductive paste.
- a conductor pattern 35 to be transferred is formed on the insulating substrate 31 on one surface of the transfer sheet 34 (FIG. 13 B).
- the insulating base material 31 is made of a thermosetting resin in a semi-cured state
- the transfer sheet 34 is made of a resin film such as polyethylene terephthalate (PET).
- PET polyethylene terephthalate
- the conductor pattern 35 is formed by pattern etching a conductor foil such as copper foil that is previously adhered to the transfer sheet 34.
- a conductor pattern formed on the transfer sheet 34 The semiconductor chip 36 is bonded to the predetermined part of 35 (Fig. 13 C). Then, the upper surface of the insulating substrate 31 and the conductor pattern 35 side of the transfer sheet 34 are pressure-bonded, and the semiconductor chip 36 is accommodated in the air gap 32, and the conductor pattern 35 Connect to the via penetrator 3 3 ( Figure 1 3D).
- the conductor pattern 35 is buried in the upper surface of the semi-cured insulating substrate 31, and thereafter only the transfer sheet 34 is removed from the insulating substrate 31. Then, the insulating base material 31 is heat-treated and completely cured to complete the element-embedded substrate 30 (FIG. 13 E).
- the conductor pattern 35 formed on the transfer sheet 34 is, for example, a pattern of a metal foil adhered on the transfer sheet 3 4 as disclosed in Japanese Patent Laid-Open No. 9-27058.
- the transfer sheet is made of a metal material such as stainless steel.
- the rigidity is high as compared with the case where the transfer sheet is made of a resin film, the dimensional stability of the conductor pattern is improved.
- the rigidity of the insulating base material to be transferred is strong, it is difficult to remove the transfer sheet from the insulating base material, and there is a problem that the transfer function of the conductor pattern can not be properly performed.
- the present invention has been made in view of the above problems, and can secure the dimensional stability of the conductor pattern to form a fine pitch conductor pattern on the insulating layer with high accuracy, and properly remove the transfer sheet. It is an object of the present invention to provide a method of manufacturing an element-embedded substrate, an element-embedded substrate, a method of manufacturing a printed wiring board, and a printed wiring board. Disclosure of the invention
- the transfer sheet is made of metal and the transfer sheet is made conductive, whereby a fine pitch conductor pattern is formed with high accuracy using the pattern plating technology by the additive method. Make it possible.
- the transfer sheet and the insulating layer are attached to each other, and then the transfer sheet is removed from the insulating layer.
- the transfer sheet is mainly composed of a metal material, there is almost no dimensional change at the time of handling, whereby dimensional stability of the transferred conductor pattern is secured.
- the transfer sheet can be configured to include a metal base material, and a to-be-melted metal layer on which a conductor pattern is formed and which is laminated separably to the metal base material.
- the metal base material occupies the major part of the entire thickness of the transfer sheet, and is mainly configured to have the mechanical properties or material properties required for handling.
- FIG. 1 is a cross-sectional view schematically showing the structure of a device-incorporated substrate according to a first embodiment of the present invention.
- FIG. 2 is a cross-sectional view showing a state in which the element-embedded substrate shown in FIG. 1 is multilayered.
- FIGS. 4A to 4D are process cross-sectional views for explaining a method of manufacturing a device-incorporated substrate according to the first embodiment of the present invention
- FIG. 4A is a device accommodation process
- FIG. 4D shows the removal process of the transfer sheet, respectively.
- FIG. 5A is a cross-sectional view schematically showing the structure of a transfer sheet applied to the first embodiment of the present invention
- FIGS. 5B to 5D illustrate the modification thereof.
- FIG. FIG. 6 is a process flow diagram for explaining a method of manufacturing a device-incorporated substrate according to the first embodiment of the present invention.
- FIGS. 7A to 7G are process cross-sectional views for explaining the method for producing a printed wiring board according to the second embodiment of the present invention, and in particular, FIGS. 7C to 7F are patterns.
- the formation step (G) shows a part of the pattern transfer step.
- FIGS. 8A to 8C are process cross-sectional views for explaining the method for producing a printed wiring board according to the second embodiment of the present invention, and particularly show the process of removing the transfer sheet.
- FIGS. 9A to 9H are process cross-sectional views for explaining a method of manufacturing a device-incorporated substrate according to the third embodiment of the present invention.
- FIGS. 1OA to 1OD are cross-sectional views of processes, illustrating a method of manufacturing a device-incorporated substrate according to a third embodiment of the present invention.
- 11A to 11F are process cross-sectional views illustrating a method of manufacturing a device-incorporated substrate according to a fourth embodiment of the present invention.
- FIG. 12 is a cross-sectional view of relevant parts for explaining a modification of the chip mounting step according to the first embodiment of the present invention.
- FIGS. 13A to 13F are cross-sectional views of processes, illustrating a method of manufacturing a conventional substrate with a built-in element.
- FIGS. 1 to 5D show the configuration of a device built-in substrate 50 according to a first embodiment of the present invention.
- the insulating base material 5 1 constituting the insulating layer is electrically
- the insulating base material 51 is formed of a resin base material mainly made of a thermoplastic resin material.
- the present invention is not limited to this, and may be appropriately selected according to the application object and application.
- those in which glass fiber is impregnated with epoxy resin, those in which glass fiber is impregnated with polyimide resin, or those in which paper is impregnated with phenol resin are used.
- bismaleimido triazine resin, benzocyclobene resin, liquid crystal polymer, and the like are also applicable.
- the conductive material 59 filled in the through holes 53 may be either lead-free or lead-free solder material, but it is preferable to use lead-free solder material from the viewpoint of environmental protection.
- a lead-free solder material an alloy obtained by adding B i, I n, C u, S b and the like to an S n -A g system is typical.
- a conductive paste obtained by mixing conductive particles such as silver powder or copper powder in a resin can be used as another conductive material other than the solder material.
- a nonconductive adhesive 54 is provided on the surface of the insulating base 51, and a conductor pattern 55 patterned in a predetermined shape is adhered on the adhesive 54.
- the conductor pattern 55 is made of, for example, an electroplated film made of copper, and is electrically joined to the semiconductor chip 56 housed in the air gap 52, and at the same time, the conductive material 5 in the through hole 53. It is electrically connected to 9).
- the conductor pattern 55 is formed on the insulating base 51 by the transfer method.
- the semiconductor chip 56 in the present embodiment is a bare chip, and an aluminum electrode pad portion provided on the bonding surface (active surface) of the semiconductor chip 56 is a bump having a gold or gold-plated surface (a metal bump electrode) 5 7 is formed ing.
- the bumps 57 are not limited to the illustrated pole bumps, but may be stud bumps or bump bumps. Further, the present invention is applicable not only to semiconductor bare chips but also to semiconductor package components and the like in which bumps are formed in rows or in an area on the mounting surface like BGA / CSP or the like.
- An underfill resin layer 58 made of a thermosetting adhesive resin such as epoxy resin is formed between the conductor pattern 55 and the semiconductor chip 56 inside the void 52.
- the semiconductor chip 56 is maintained in a state of bonding with the conductor pattern 55 by the underfill resin layer 58.
- the semiconductor chip 56 in the air gap 52 may be completely sealed with the same resin material.
- conductor pattern 55 is covered with solder resist 60, but openings 60a and 60a are formed in the portion corresponding to through hole 53, and conductor pattern 55 is exposed to the outside. ing.
- the conductor pattern 55 is formed of an electroplated layer, the conductor pattern 55 can be made to have a finer pitch, which further improves the mounting density. Improvement can be achieved.
- FIG. 2 shows an element-embedded multilayer substrate 65 in which a plurality of element-embedded substrates 50 configured as described above are stacked.
- a configuration is shown in which three element-incorporated substrates 50 having the above-described configuration are stacked and mounted on a base substrate 66.
- the electrical and mechanical connection between the ridges of the device-embedded multilayer substrate 65 is made by the conductive material 5 9 which is bonded to the surface of the conductor pattern '5 5 through the opening 60 a of the solder resist 60.
- connection can be performed in a short time as compared with the case of using a conductive paste, and resistance can be reduced.
- the base substrate 66 is formed by connecting an insulating base material 67, upper wiring layer 70 and lower wiring layer 71 formed by patterning on the front and back surfaces, and these wiring layers 70, 71.
- the through-hole plating 68 is formed.
- a filler 69 made of a conductive material or a nonconductive material is filled in the through hole, thereby preventing a so-called popcorn phenomenon or improving the heat radiation efficiency. There is.
- the element built-in multilayer substrate 65 configured as described above is in the form of a land grid array (LGA), and when mounting on a single substrate, the openings 7 3 a and 7 3 a of the solder resist 7 3 are used.
- An external electrode such as a pole bump is provided to lower wiring layer 71 exposed to the outside through the same.
- another electric element or electronic component may be mounted on the wiring layer (conductor pattern) 55 of the element-incorporated substrate 50 located on the uppermost layer.
- the insulating base material 51 of the above-described configuration is prepared, and an adhesive 5 for forming an adhesive material layer is applied on this surface (FIG. )).
- the adhesive 54 is for adhering the conductor pattern 55 to be transferred later to the insulating substrate 51, and is required to be nonconductive. Also, in order to prevent the adhesive from flowing out to the air gap portion 5 2 and the through hole 5 3 when the conductor pattern 5 5 is transferred, the material constituting the adhesive 5 4 has less uniformity and maintains its shape. High ones are used. As such a material, for example, "AS- 3000" manufactured by Hitachi Chemical Co., Ltd. may be mentioned.
- a step of forming a cavity for forming a cavity 52 for housing the element and a through hole 53 for interlayer connection is performed on the insulating base 51 (see FIG. 3C). Step S 1).
- the air gap 52 is required to have an inner dimension larger than the outer diameter of the semiconductor chip 5 6 to be accommodated.
- the step of forming the conductor pattern 55 is performed as shown in FIG. 3 (D) to (G) (step S 2).
- the transfer sheet 61 having the configuration shown in FIG. 5A is used.
- the transfer sheet 61 is, for example, a metal base material 62 of copper having a thickness of about 100 / xm, a conductive adhesive resin layer 63, and a chrome having a thickness of 5 m or less (C r) has a three-layer structure with a to-be-melted metal layer 64.
- the metal base material 62 and the to-be-melted metal layer 64 are laminated so as to be separable from each other via the conductive adhesive resin layer 63.
- the metal base material 62 occupies the major part of the entire thickness of the transfer sheet 61, and is configured to have mechanical properties or material properties mainly required for handling.
- the conductive adhesive resin layer 63 is made of a material that can ensure conduction between the metal base material 62 and the metal layer 64 to be dissolved, and can be separated and removed from each other. Benzotriazole resin is applied.
- the to-be-melted metal layer 64 is composed of a metal foil and a metal plating layer, and is composed of a metal material different from that of the conductor pattern 55 so that it can be selectively etched to the conductor pattern 55. Ru.
- the structural example for separating and removing the metal base material 62 and the to-be-melted metal layer 64 mutually is not only said above, it is also possible to employ
- a photoresist film 72 is formed on the surface of the transfer metal layer 64 on the side of the transfer sheet 61 having the above-described structure.
- the photoresist film 72 may be either a dry film resist or a liquid resist. Then, the formed photoresist film 72 is subjected to exposure and development processing to pattern the photoresist film 72 into a predetermined shape, thereby forming a photoresist 7 2 A (FIG. 3 (E (E)). )).
- the transfer sheet 61 is dipped in a resist 72A together with, for example, a copper electrolytic bath, and connected to a force-sword electrode (not shown) so that copper electroplated on the metal layer 64 to be dissolved.
- a resist 72A together with, for example, a copper electrolytic bath, and connected to a force-sword electrode (not shown) so that copper electroplated on the metal layer 64 to be dissolved.
- Deposit layer 5 5 A FIG. 3 (F)
- the plating resist 72 A is removed (FIG. 3 (G)).
- the conductor pattern 55 composed of the electrodeposited layer 55A is formed on the surface of the transfer sheet 61.
- the electroplated layer 55 A is formed not only on the metal layer to be dissolved 64 of the transfer sheet 61 but also on the metal base material 62, but the illustration thereof is omitted.
- the conductor layer is deposited only at necessary portions to form a conductor pattern. Since the method (additive method) can form a finer pattern, according to the present embodiment, a conductor pattern of LZS with a fine pitch of, for example, 1 0 ⁇ m / 1 0 m can be made with high accuracy. It can be formed. If a fine-pitched conductor pattern is not required, a conductor layer is further formed on the to-be-melted metal layer 64 by a method such as electroplating, It is also possible to form a conductor pattern by pattern etching the conductor layer.
- the transfer sheet 61 and the insulating base 51 are attached to each other through the formed conductive pattern 55, and the conductor pattern 55 is used as the insulating base 5
- the transfer sheet 61 is made of metal, its strength is higher than that of a transfer sheet composed of a conventional resin film, and thus, the transfer is performed. Expansion and warping during handling of the sheet 61 can be suppressed, and the fine-pitched conductor pattern 55 can be properly adhered onto the insulating base 51 with high dimensional stability.
- the transfer sheet 61 can have sufficient strength, pattern transfer with a higher load than before can be performed, and restrictions on the transfer process can be reduced. In particular, since local deformation of the transfer sheet is suppressed at the time of transfer, deformation and breakage of the conductor pattern can be avoided.
- step S 4 the semiconductor chip 56 is housed inside the air gap 52 of the insulating base 51, and the bumps 57 formed on the active surface are joined to the conductor pattern 55.
- the process to be performed is performed (step S 4).
- the mounting of the semiconductor chip 56 on the conductor pattern 55 is performed using, for example, a known mounter.
- the bumps 5 7 are formed of gold or with gold plating on the surface, so if bonding to the conductor pattern (copper) 5 5 as it is, Au-Cu Bond. Therefore, if a tin (Sn) -based metal film is further formed by electroplating or the like on the surface of the conductor pattern 55 formed on the transfer sheet 61, the bonding step is performed as Au-Sn As a result, the semiconductor chip 56 can be joined at a lower temperature and a lower load as compared with the A u -C u junction.
- Sn-based metals Sn, Sn-based alloys (S n Ag, S n Bi, S n C u, etc.) can be mentioned. In addition to Sn-based metals, similar effects can be obtained by forming a NiP / Au film.
- the bumps 5 and 7 of the semiconductor chip 56 may be formed of Sn-based metal.
- bumps may be formed only with Sn-based metals, or surfaces of other metal poles or resin balls may be plated with Sn-based metals.
- the Sn-based metals include Sn, SnAg, SnBi, SnCu, SnAgCu, SnAgBi, SnAgBi, and the like.
- thermosetting resin such as epoxy is injected into the inside of the air gap 52, and the space between the conductor pattern 55 and the semiconductor chip 56 is obtained.
- the step of forming the underfill resin layer 58 is carried out (FIG. 4A, step S5).
- the conductive pattern 55 is supported by both the transfer sheet 61 and the underfill resin layer 58.
- the process of bonding the semiconductor chip 56 to the conductor pattern 55 and the process of forming the underfill resin layer 58 for sealing the bonded semiconductor chip 56 in the inside of the air gap 52 are the main processes.
- the "element accommodation process” according to the invention is configured.
- the bonding process of the semiconductor chip 56 is not limited to the above, and the semiconductor chip 56 is previously bonded to the conductor pattern 55 on the transfer sheet 61, and the insulating substrate 51 and the transfer sheet 61 are connected. At the time of bonding, the bonded semiconductor chip 56 may be accommodated in the air gap 52. In this case, since the transfer sheet 61 is made of metal, deformation or the like of the transfer sheet 61 due to the weight of the semiconductor chip 56 can be suppressed. At this time, if an adhesive is used as the plating resist 72 A. For example, as shown in FIG. 12, the plating resist 7 2 A is an underfill resin layer for the semiconductor chip 56. It can be used as In this case, the thickness of the conductor pattern 55 may be set so that the bumps 57 of the semiconductor chip 56 can reach.
- the step of removing the transfer sheet 61 is performed.
- the removal of the transfer sheet 61 is performed by the step of separating and removing the metal base material 62 from the dissolved metal layer 64 (FIG. 4B) and the step of dissolving the dissolved metal layer 64. It consists of the process of removing (Fig. 4C).
- the step of separating and removing the metal base material 62 from the to-be-melted metal layer 64 is carried out in the following manner: the metal base material 62 is to be melted via the conductive adhesive resin layer 63; It is done by peeling off from 6 4 (step S 6).
- the conductive adhesive resin layer 63 is separated from the metal base material 62 from the metal layer 64 by removing the release agent at a predetermined portion on the surface of the metal layer 64 side. May be applied.
- the peeling process of the metal base material 62 is easily performed by making a cut of peeling start at the boundary between the metal base material 62 and the metal layer to be melted 64 at the edge portion of the transfer sheet 61. It can be carried out.
- the metal base material 6 is It is possible to properly separate and remove 2 and the metal layer to be melted 64 (Fig. 4C).
- Step S In the step of dissolving and removing the to-be-dissolved metal layer 64, only the to-be-dissolved metal layer 64 is selectively removed using an etching solution which dissolves the to-be-dissolved metal layer 64 but not the conductor pattern 55. Yes ( Figure 4D), Step S
- the conductor pattern 55 is made of copper
- the metal layer to be melted 64 is made of Since it is formed of chromium, it is possible to dissolve and remove only the to-be-dissolved metal layer 64 while leaving the conductor pattern 55 by using, for example, a hydrochloric acid-based etching solution.
- step S 7 As described above, according to each of the steps from the bonding step (step S 3) of the insulating base 51 and the transfer sheet 61 to the dissolving and removing step (step S 7) of the metal layer to be dissolved 64.
- a conductive material 59 as a conductive material is used as a conductive material in the through holes 53 of the insulating base 51 using the screen printing method or the dispensing method.
- a conductor filling step of filling is performed, and a step of covering the surface of conductor pattern 55 with solder resist 60 except for the portion corresponding to the formation site of through hole 53 is performed (step S 8). .
- a predetermined multilayering process is performed (step S 9).
- the element built-in substrate 50 of the present embodiment is manufactured.
- the transfer sheet 61 is made of metal, fine-pitched conductor patterns 55 can be formed with high accuracy by using the pattern plating technique by the electric plating method.
- transfer sheet 61 has predetermined mechanical strength and heat resistance, dimensional stability of transferred conductive pattern 55 is secured with almost no dimensional change during handling or heating. be able to.
- the conductor pattern 55 may be properly formed even if the insulating base 51 has strong rigidity.
- the transcription can be secured.
- the removal of the transfer sheet 61 is constituted by the steps of separating and removing the metal base material 62 from the dissolved metal layer 64, and dissolving and removing the dissolved metal layer 64. This facilitates the removal of the sheet 61, thereby improving the productivity.
- FIG. 7 and 8A to 8C show a second embodiment of the present invention.
- a method of manufacturing a printed wiring board according to the present invention will be described.
- FIG. 7 (A) prepared insulating substrate 81, applying an adhesive 8 4 for forming an adhesive material layer on the surface (FIG. 7 (B)) t present
- the same materials as the insulating base 51 and the adhesive 54 described in the first embodiment described above are used for the insulating base 81 and the adhesive 84 according to the embodiment.
- the conductor pattern 85 transferred to the insulating base 81 is formed on a metal transfer sheet 91 as shown in FIGS. 7 (C) to (F), as in the first embodiment. It is formed by the electric plating method.
- the transfer sheet 91 has the same structure as the transfer sheet 61 in the first embodiment without detailed description, and is made of a metal base material 92 made of copper, and a metal layer made of chromium made of chromium. 9 and a conductive adhesive resin layer (not shown) interposed between them.
- ⁇ Solder resist 7 3 is patterned on the to-be-dissolved metal layer 9 4 of the transfer sheet 9 1.
- a conductive resist 7 3 A is formed, and the conductor pattern 8 5 is composed of an electroplated layer (copper) 8 5 A deposited in the area divided by the plating resist 7 3 A (FIG. 7 ( E))).
- the transfer sheet 9 1 on which the conductor pattern 8 5 is formed is a base material 8 after removal of the plating resist 7 3 A.
- the conductor pattern 85 is transferred onto the adhesive 84 by being pasted on top of 1 (Fig. 7 (G)).
- a removal process of the transfer sheet 91 attached on the insulating base 81 is performed.
- the transfer sheet 91 is removed by separating the metal base material 92 from the metal layer 94 to be dissolved, and dissolving the metal layer 94 to be dissolved. And by.
- the dissolution and removal of the to-be-dissolved metal layer 94 is
- the etch system of hydrochloric acid is used which dissolves 94 but does not dissolve the conductor pattern (C u) 85.
- the printed wiring board 80 manufactured as described above is, as shown in FIG. 8C, a conductor pattern 8 formed by the electroplating method for the adhesive 84 on the insulating base 81. It has a form in which 5 is adhered.
- the transfer sheet 91 is made of metal, it is possible to form the fine pitch conductor pattern 85 with high accuracy by using the pattern plating technique by the electric plating method.
- transfer sheet 91 has predetermined mechanical strength and heat resistance, dimensional stability of transferred conductive pattern 85 is secured with almost no dimensional change during handling or heating. be able to.
- the conductor pattern 85 is properly removed even when the rigid base 81 has strong rigidity.
- the transcription can be secured.
- the transfer sheet 91 is configured to include the metal base material 92 and the to-be-melted metal layer 9 4 to be separably laminated to the metal base material 92,
- the step of removing 1 1 separates and removes the metal base material 9 2 from the dissolved metal layer 9 4 and dissolves and removes the dissolved metal layer 9 4 Process to make it easy to remove the transfer sheet 91, thereby improving productivity.
- FIGS. 9 and 10A to 10D show a third embodiment of the present invention.
- a method of manufacturing an element built-in substrate according to the present invention will be described.
- parts corresponding to those in the first embodiment described above are assigned the same reference numerals and detailed explanations thereof will be omitted.
- FIG. 9 (A) an insulating base 51 is prepared, and an adhesive for forming an adhesive 54 is applied to this surface (FIG. 9 (B)).
- FIG. 9 (C) an air gap formation process for forming a space 52 for housing the element and a through hole 53 for interlayer connection is performed on the insulating base material 51.
- the step of forming the conductor pattern 55 is carried out as shown in FIGS. 9 (D) to (G).
- the transfer sheet 61 in forming the conductor pattern 55, the transfer sheet 61 having the configuration shown in FIG. 5A is used. That is, it comprises a metal base material 62 made of copper, a dissolved metal layer 64 made of chromium, and a conductive adhesive resin layer interposed therebetween (FIG. 9 (D)). ).
- the conductor pattern 55 shown in FIG. 9 (E) is formed of an electroplated layer formed on the surface of the transfer sheet 61 on the side of the metal layer to be dissolved 64, as in the first embodiment described above.
- a step of burying the insulating film between the formed conductor patterns and planarizing the surface of the transfer sheet 61 on the side to be dissolved metal layer 64 is performed.
- this process is carried out on the entire surface of the transfer sheet 61 on the side of the metal layer 64 to be melted, from the top of the formed conductor pattern 55.
- an insulating film 87 made of an insulating resin such as epoxy resin is applied by, for example, a screen printing method and cured.
- the hardened insulating film 87 is polished to expose the surface of the conductor pattern 55 to the outside.
- the insulating film 87 is embedded between the conductor patterns 55, and the surface of the transfer sheet 61 on the side of the metal layer to be melted 64 is planarized.
- the transfer sheet 61 is made of metal, its strength is higher than that of a transfer sheet made of a conventional resin film. Therefore, expansion and contraction during handling of the transfer sheet 61 are suppressed, and fine pitch is obtained.
- the conductor pattern 55 can be properly adhered onto the insulating base 51 with high dimensional stability.
- the transfer sheet 61 can have sufficient strength, pattern transfer with a higher load than before can be performed, and restrictions on the transfer process can be reduced. In particular, since local deformation of the transfer sheet is suppressed at the time of transfer, deformation and breakage of the conductor pattern can be avoided.
- the adhesive on the insulating substrate 51 is used.
- the adhesion with 5 4 can be increased to increase the adhesive strength.
- the semiconductor chip 56 is housed inside the air gap 52 of the insulating base 51, and the bumps 57 formed on the active surface thereof are used as conductor patterns 55.
- a bonding step is performed. After bonding the semiconductor chip 56 to the conductor pattern 55, epoxy resin, for example, is injected into the inside of the air gap 52, and the underfill resin layer 58 is interposed between the conductor pattern 55 and the semiconductor chip 56. Form.
- the conductor pattern 55 is supported by both the transfer sheet 61 and the underfill resin layer 58.
- the bumps of the semiconductor chip 56 are formed of gold or with gold plating on the surface, Sn-based metal or NiZa-based metal is formed on the surface of the conductor pattern 55 made of copper. By forming the plating, it is possible to realize chip mounting under low temperature and low load environment.
- the transfer sheet 61 is removed.
- the transfer sheet 61 is removed by separating the metal base material 62 from the metal layer 64 to be dissolved (FIG. 10 B) and dissolving and removing the metal layer 64 to be melted (FIG. 10 C) Figure is composed of
- the process of removing the transfer sheet 61 is performed by the same method as the method described in the first embodiment described above, and thus the description thereof is omitted here.
- a conductive material 59 as a conductive material is screen-printed or dispensed in the through-hole 53 of the insulating substrate 51. While using and filling, formation of through hole 53 A step of covering the surface of the conductor pattern 55 except for the portion corresponding to the portion with the solder resist 60 is performed.
- the element-embedded substrate 50 ′ of the present embodiment is manufactured. According to the present embodiment, the same effect as that of the first embodiment described above can be obtained.
- the conductor pattern 55 can be adhered with high adhesion to the insulating base 51, so that an element-embedded substrate 50 'with excellent durability can be obtained. .
- metal plating is formed in the chip mount region of the conductive pattern 55, shorting between the patterns can be prevented, and therefore, mounting of a semiconductor chip with a narrow pad pitch can be achieved.
- FIGS. 11A to 11F show a fourth embodiment of the present invention.
- a method of manufacturing an element built-in substrate according to the present invention will be described.
- parts corresponding to those in the first embodiment described above are given the same reference numerals, and detailed descriptions thereof will be omitted.
- a plating resist for electro plating 7 2 A (which is formed when depositing the conductor pattern 5 5 on the surface of the transfer metal layer 6 4 of the transfer sheet 6 1 shown in FIG. FIG. 11 B is configured as the insulating film 87 for planarization described in the third embodiment described above.
- the plating resist 7 2 A is configured to fill the space between the conductor patterns 5 5 as shown in FIG. 1 1 C when the conductor pattern 5 5 is formed.
- the conductor pattern 55 after the formation of the conductor pattern 55, it is possible to bond on the insulating base material 51 as shown in FIG. 11D without forming a separate insulating film for planarization. The same effect as that of the third embodiment described above can be obtained.
- the conductor pattern 55 can be pasted onto the insulating base 51 with higher adhesive strength.
- the adhesive 54 on the insulating base 51 can be made unnecessary.
- the transfer sheet 61, 91 between the metal base material 62, 92 and the to-be-melted metal layer 64, 94.
- the metal base material 6 2, 9 2 and the metal layer 6 4, 9 4 can be separated from each other by interposing the conductive adhesive resin layer 6 3
- the configuration is not limited to this, and any configuration may be used as long as the metal base material and the metal layer to be dissolved can be separated from each other.
- a transfer sheet 101 whose cross-sectional structure is shown in FIG. 5B is formed of a chromium-plated metal base material 102 and a nickel-plated molten metal layer 104.
- the intermediate layer 103 which is a stick, is interposed, and the metal layer to be dissolved (N i) 104 and the intermediate layer (C r) 103 are separated at the interface using a plating stress difference. It is configured.
- a hydrogen oxide aqueous etching solution may be used. Also, in FIG.
- each layer 10 3 and 10 4 will be formed by the interface. Can be easily separated.
- a soft etching agent based on, for example, a sulfated hydrogen peroxide solution can be applied in the dissolution and removal step of the metal layer to be dissolved (Ni / Co) 104. is there.
- the removal of the transfer sheets 61 and 91 is performed by removing the metal base materials 62 and 92, and removing the dissolved metal layers 64 and 94.
- the entire transfer sheet may be dissolved and removed instead.
- the transfer sheet when the transfer sheet is made of the same metal, it may of course be made of a laminate of different metals. In the case of the latter, in particular, each metal layer is selectively etched using different etchants. Good.
- FIG. 5C shows the structure of a transfer sheet 1 1 1 composed of first and second metal layers 1 1 2 and 1 1 4 different from each other.
- first metal layer 112 is copper and the second metal layer 114 is nickel, only the first metal layer (Cu) 112 is etched if an alkaline etchant is used. It is possible.
- first metal layer 112 is copper and the second metal layer 114 is aluminum, only the first metal layer (Cu) 112 is etched if sulfuric acid water is used as an etchant. can do.
- Other examples of combinations of the first and second metal layers 112, 114 include nickel and gold, copper and chromium, and the like.
- the combination example of these different metals is also applied as a combination example of the constituent metals of the metal layer to be dissolved (64, 94) and the constituent metals of the conductor patterns (55, 85).
- the transfer sheet may be composed of two layers of a metal base material and a metal layer to be dissolved, and these layers may be separated according to the difference in thermal expansion coefficient of each layer.
- a thermally foamed layer 132 is interposed between the metal base material 122 and the to-be-melted metal layer 124, to a predetermined temperature.
- the thermally foamed layer 132 may be foamed by heat treatment to separate the metal base material 122 and the to-be-dissolved metal layer 124.
- a metal sheet is used as a transfer sheet, a fine-pitched conductor pattern can be formed with high accuracy.
- the dimensional stability of the formed conductor pattern can be secured and transferred to the insulating layer.
- the transfer sheet is finally removed by dissolving and removing the transfer sheet, it is possible to ensure the proper transfer action of the conductor pattern.
- the transfer sheet includes a metal base material and a to-be-dissolved metal layer laminated in a separable manner with respect to the metal base material, and the removal of the transfer sheet involves removing the metal base material from the to-be-dissolved metal layer.
- the conductor pattern formed on the insulating layer is formed of the electrodeposited layer, so that the conductor pattern can be made to have a finer pitch.
- the density can be improved.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Manufacturing Of Printed Wiring (AREA)
- Production Of Multi-Layered Print Wiring Board (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP03766619A EP1542519A4 (en) | 2002-07-31 | 2003-06-20 | METHOD FOR PCB CONSTRUCTION WITH AN INTEGRATED EQUIPMENT AND PCB WITH INTEGRATED EQUIPMENT AND METHOD FOR PRODUCING A PRINTED PCB AND PRINTED PCB |
| US10/523,331 US7874066B2 (en) | 2002-07-31 | 2003-06-20 | Method of manufacturing a device-incorporated substrate |
| US12/435,185 US8146243B2 (en) | 2002-07-31 | 2009-05-04 | Method of manufacturing a device incorporated substrate and method of manufacturing a printed circuit board |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002223846A JP3608559B2 (ja) | 2002-03-26 | 2002-07-31 | 素子内蔵基板の製造方法 |
| JP2002-223846 | 2002-07-31 |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US10523331 A-371-Of-International | 2003-06-20 | ||
| US12/435,185 Division US8146243B2 (en) | 2002-07-31 | 2009-05-04 | Method of manufacturing a device incorporated substrate and method of manufacturing a printed circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2004014114A1 true WO2004014114A1 (ja) | 2004-02-12 |
Family
ID=31492117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2003/007872 Ceased WO2004014114A1 (ja) | 2002-07-31 | 2003-06-20 | 素子内蔵基板の製造方法および素子内蔵基板、ならびに、プリント配線板の製造方法およびプリント配線板 |
Country Status (4)
| Country | Link |
|---|---|
| US (2) | US7874066B2 (ja) |
| EP (1) | EP1542519A4 (ja) |
| CN (1) | CN100452342C (ja) |
| WO (1) | WO2004014114A1 (ja) |
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| WO2006067280A1 (en) * | 2004-12-23 | 2006-06-29 | Aspocomp Technology Oy | Conductive pattern, circuit board and their production method |
| US8687369B2 (en) | 2012-02-20 | 2014-04-01 | Apple Inc. | Apparatus for creating resistive pathways |
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| CN112616265B (zh) * | 2020-12-04 | 2021-12-14 | 景旺电子科技(珠海)有限公司 | 一种印刷电路板的制作方法及印刷电路板 |
| CN115884517A (zh) * | 2021-09-29 | 2023-03-31 | 欣兴电子股份有限公司 | 于电路板上形成电阻的方法与电路板结构 |
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| US8687369B2 (en) | 2012-02-20 | 2014-04-01 | Apple Inc. | Apparatus for creating resistive pathways |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1542519A1 (en) | 2005-06-15 |
| US20090217518A1 (en) | 2009-09-03 |
| US7874066B2 (en) | 2011-01-25 |
| US8146243B2 (en) | 2012-04-03 |
| CN100452342C (zh) | 2009-01-14 |
| US20060124345A1 (en) | 2006-06-15 |
| EP1542519A4 (en) | 2010-01-06 |
| CN1672473A (zh) | 2005-09-21 |
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