WO2016157465A1 - 加圧ユニット - Google Patents
加圧ユニット Download PDFInfo
- Publication number
- WO2016157465A1 WO2016157465A1 PCT/JP2015/060297 JP2015060297W WO2016157465A1 WO 2016157465 A1 WO2016157465 A1 WO 2016157465A1 JP 2015060297 W JP2015060297 W JP 2015060297W WO 2016157465 A1 WO2016157465 A1 WO 2016157465A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transmission member
- guide member
- assembly
- transmission
- pressurizing unit
- Prior art date
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 126
- 238000010438 heat treatment Methods 0.000 claims abstract description 59
- 239000002923 metal particle Substances 0.000 claims abstract description 57
- 239000000758 substrate Substances 0.000 claims abstract description 46
- 238000010304 firing Methods 0.000 claims abstract description 7
- 125000006850 spacer group Chemical group 0.000 claims description 19
- 238000004519 manufacturing process Methods 0.000 abstract description 28
- 230000007423 decrease Effects 0.000 abstract description 8
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- 238000000034 method Methods 0.000 description 12
- 239000006185 dispersion Substances 0.000 description 8
- 239000004065 semiconductor Substances 0.000 description 8
- 238000005245 sintering Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000004020 conductor Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229920006015 heat resistant resin Polymers 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000009766 low-temperature sintering Methods 0.000 description 1
- 239000002082 metal nanoparticle Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
- B23K20/023—Thermo-compression bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
- B23K1/0016—Brazing of electronic components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/002—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating specially adapted for particular articles or work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/26—Auxiliary equipment
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- H—ELECTRICITY
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/52—Mounting semiconductor bodies in containers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
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Definitions
- the present invention relates to a pressure unit used when a metal particle paste is baked by heating an assembly in which electronic components are arranged on a substrate via a metal particle paste while being pressed by a pair of heating units.
- a joined body in which a substrate and an electronic component are joined by a fired metal particle paste is known.
- a semiconductor device in which a substrate on which a conductor pattern is formed and a semiconductor element are bonded with a fired metal particle paste can be given (for example, see Patent Document 1). .
- the joined body 10 includes a substrate 1, an electronic component 2, and a fired metal particle paste 3.
- the substrate 1 is, for example, a substrate on which a conductor pattern is formed.
- the electronic component 2 is a semiconductor element, for example.
- the fired metal particle paste 3 is obtained by firing a metal particle paste 4 described later.
- substrate 1, the electronic component 2, and the metal particle paste 4 are demonstrated in detail by Embodiment 1 mentioned later.
- the joined body 10 is manufactured by the following method, for example.
- the assembly 20 is prepared (first step).
- the assembly 20 is obtained by arranging the electronic component 2 on the substrate 1 via the metal particle paste 4.
- the assembly 20 is disposed between a pair of heating units (heating plates) 1000 and 1002 (second step). Since the heating part 1000 is on the lower side in the manufacturing method of the joined body shown here, the assembly 20 is disposed on the upper surface of the heating part 1000.
- the pair of heating units 1000 and 1002 are disposed at positions facing each other and are heated by a heating mechanism (not shown). Further, the pair of heating units 1000 and 1002 pressurize what is sandwiched between the pair of heating units 1000 and 1002 by moving the heating unit 1002 toward the heating unit 1000 by a pressurizing mechanism unit (not shown). be able to.
- the heating unit 1002 is moved toward the heating unit 1000, the assembly 20 is heated while being pressed by the pair of heating units 1000 and 1002, and the metal particle paste 4 is fired. 10 (see FIG. 1) is manufactured (third step).
- the assembly 20 is heated while being pressed by a pair of heating units 1000 and 1002 to sinter the metal particle paste 4, thereby joining the substrate 1 and the electronic component 2. Is possible.
- heat is transmitted from the heating unit 1000 to the metal particle paste 4 before the assembly 20 is heated while being pressed by the pair of heating units 1000 and 1002. May partially cause a sintering reaction (solidification reaction). If the metal particle paste 4 partially undergoes a sintering reaction, the density and strength of the fired metal particle paste 3 may not be sufficient. As a result, the substrate 1 and the electronic component 2 Bondability may be reduced.
- the heating unit In order to prevent the metal particle paste from partially causing a sintering reaction, the heating unit is cooled when the assembly is disposed, and the heating unit is pressurized after the assembly is pressurized by the pair of heating units. It seems like it should be heated. However, since it takes a considerable amount of time to heat and cool the heating section, changing the temperature of the heating section each time the assembly is placed may significantly reduce the production efficiency of the assembly. There is.
- An object of the present invention is to provide a pressure unit for use in a method for manufacturing a joined body capable of preventing the above.
- the inventor of the present invention can suppress a decrease in the bondability between the substrate and the electronic component, and the production efficiency of the bonded body significantly decreases.
- a method of manufacturing a bonded body that can be prevented has been invented.
- the manufacturing method of the joined body is simply to heat the assembly while pressurizing it through a pressurizing unit (see each embodiment to be described later, particularly Embodiment 1).
- the pressure unit since the pressure unit is used, unintentional heat conduction from the heating unit to the metal particle paste can be suppressed, and the above-described effects can be obtained.
- This invention is invention about the pressurization unit for using for the manufacturing method of the said conjugate
- the pressurizing unit of the present invention is a pressurizing unit used for firing the metal particle paste by heating an assembly in which an electronic component is placed on a substrate through a metal particle paste while being pressed by a pair of heating units.
- the pressure unit is At least the plate-shaped first transmission member that contacts the substrate at the time of pressurization and the plate-shaped second transmission member that contacts at least the electronic component at the time of the pressurization, and when the metal particle paste is sintered,
- a pair of transmission members that sandwich the assembly and transmit pressure and heat to the assembly, and the pair of transmission members are coupled, and at least one of the first transmission member and the second transmission member
- a mechanism for adjusting a distance between the first transmission member and the second transmission member, the guide member enabling movement of the delivery member while maintaining parallelism with respect to the other transmission member, When between the transmission members, the first transmission member or the second transmission member is separated from the assembly when the pressure is not applied, and the first transmission member
- the interval adjusting mechanism has an elastic member that extends when the pressure is not applied and contracts when the pressure is applied.
- the elastic member is formed of a coil spring and is arranged with the guide member as an axis.
- one end of the guide member is fixed to the first transmission member, and the second transmission member has a guide member receiving hole corresponding to the guide member.
- the formed second transmission member is preferably movable along the guide member inserted into the guide member receiving hole.
- the other end of the guide member on the side opposite to the one end is in the guide member receiving hole during the pressurizing.
- the other end of the guide member on the side opposite to the one end is inserted from the guide member receiving hole during the pressurization.
- the second transmission member protrudes to the side opposite to the side facing the first transmission member, and the second transmission member has a spacer that is thicker than the length of the guide member protruding from the guide member receiving hole. It is preferable that the guide member further has a protruding side.
- the pressurizing unit includes four or more guide members, and the guide member is viewed from a direction perpendicular to a surface of the first transmission member on which the substrate is disposed. It is preferable that the guide member is disposed at a vertex of a predetermined quadrangle surrounding at least a place where the assembly is to be disposed.
- the transmission member is inserted between the assembly and the pair of heating parts at the time of pressurization, and unintentional heat from the heating part to the metal particle paste.
- the conduction it is possible to suppress the metal particle paste from partially causing a sintering reaction (solidification reaction), and as a result, it is possible to suppress a decrease in the bondability between the substrate and the electronic component. It becomes possible to do.
- the pressurizing unit of the present invention suppresses unintentional heat conduction from the heating unit to the metal particle paste as described above, and thus the assembly is arranged without changing the temperature of the heating unit. Thus, it is possible to prevent the production efficiency of the joined body from being significantly reduced.
- the pressurizing unit of the present invention can suppress a decrease in the bondability between the substrate and the electronic component, and prevent the production efficiency of the bonded body from being significantly decreased. It becomes a pressurization unit for using for the manufacturing method of the conjugate
- the pressurizing unit of the present invention since the guide member is provided, it is possible to maintain the parallelism between the pair of transmission members even when the pair of transmission members are moved by the pressurization. It is possible to suppress the occurrence of a variation in bonding strength between places between the electronic component and the electronic component.
- the gap adjusting mechanism since the gap adjusting mechanism is provided, it is possible to suppress vibrations and shocks applied to the pair of transmission members during non-pressurization from being transmitted to the assembly. As a result, it is possible to prevent the positional relationship between the substrate and the electronic component from deviating.
- FIG. 1 is a conceptual diagram of a joined body 10.
- 1A is a top view
- FIG. 1B is an A1-A1 cross-sectional view (side cross-sectional view) of FIG. 1A.
- 1 is a diagram of a pressure unit 100 according to Embodiment 1.
- FIG. 2A is a top view
- FIG. 2B is an A2-A2 sectional view (side sectional view) of FIG. 2A.
- the side of the interval adjusting mechanism 140 is displayed instead of a cross section for easy understanding of the drawing. The same applies to cross-sectional views described later.
- FIG. 1 is a conceptual diagram of a joined body 10.
- 1A is a top view
- FIG. 1B is an A1-A1 cross-sectional view (side cross-sectional view) of FIG. 1A.
- 1 is
- FIG. 3A is a side sectional view showing a state of the pressurizing unit 100 and the assembly 20 at the time of non-pressurization
- FIG. 3B is a plan view of the pressurizing unit 100 and the assembly 20 on the heating unit 1000. It is a sectional side view which shows a mode when arrange
- FIG. 3A is a side sectional view showing a state of the pressurizing unit 100 and the assembly 20 at the time of non-pressurization
- FIG. 3B is a plan view of the pressurizing unit 100 and the assembly 20 on the heating unit 1000. It is a sectional side view which shows a mode when arrange
- FIG. 4A is a side cross-sectional view showing the state of the pressurizing unit 100 and the assembly 20 at the time of pressurization
- FIG. 4B is when heating is performed while pressurizing with a pair of heating units 1000 and 1002.
- It is a sectional side view which shows the mode of the pressurization unit 100, the assembly 20, and a pair of heating part 1000,1002.
- FIG. 5A is a side cross-sectional view of the pressure unit 102 and the assembly 20 when no pressure is applied
- FIG. 5B is a side cross-sectional view of the pressure unit 102 and the assembly 20 when pressure is applied. .
- FIG. 6A is a side sectional view of the pressure unit 104 and the assembly 22 when not pressurized
- FIG. 6B is a side sectional view of the pressure unit 104 and the assembly 22 when pressurized.
- FIG. 7 is a side sectional view showing the same cross section as FIG. 1B, and the same applies to FIGS. 8 and 9 below.
- the pressurizing unit 100 heats the assembly 20 in which the electronic component 2 is disposed on the substrate 1 through the metal particle paste 4 while pressing the assembly 20 with a pair of heating units 1000 and 1002. It is a pressure unit used when firing. Since the assembly 20 is the same as the assembly 20 described above (see FIG. 7), the illustration and description again are omitted.
- the “substrate” in the present specification refers to a component on which an electronic component is mounted.
- the substrate 1 carries the electronic component 2.
- the substrate 1 in the first embodiment is a circuit board in which a conductor pattern is formed on a main body made of a non-conductive substance, for example.
- the constituent material of the substrate 1 is a material that can withstand the sintering temperature of the metal particle paste 4 (depending on the type, for example, 300 ° C.) (for example, if it is a main body, it is a heat-resistant resin, ceramic, or conductor pattern). (Metal) can be used.
- the substrate to which the present invention is applied may be a DCB (Direct Copper Bond) substrate or a lead frame.
- substrate which is an application object of this invention should just mount an electronic component, for example, may be a silicon chip. That is, the present invention can be applied to connect the silicon chip and the conductive connector.
- the “electronic component” in the present specification refers to a component used in an electrical product, and particularly a component that needs to be electrically connected to a substrate.
- the electronic component 2 is a semiconductor element, for example.
- Examples of the electronic component include an electric motor, a resistor, a capacitor, a piezoelectric element, a connector, a switch, an antenna, and a conductive connector in addition to the above-described semiconductor element (for example, a semiconductor chip on which an integrated circuit is mounted). Can do.
- the pressurizing unit of the present invention can be used particularly suitably when a joined body in which at least one semiconductor element is joined to a substrate, that is, a semiconductor device is manufactured.
- the number of electronic components 2 is one, but the present invention can be applied even when the number of electronic components is two or more.
- the electronic components may be a single type or a plurality of types.
- the metal particle paste 4 is a low-temperature firing type conductive paste that contains nano-sized or sub-micron-sized metal particles in a solvent and utilizes the low-temperature sintering phenomenon and high surface activity of the metal particles.
- the metal particle paste 4 contains, for example, metal particles, an organic dispersion material, an organic dispersion material capturing material, and a volatile organic solvent.
- the metal particles include metal nanoparticles (for example, metal particles having an average diameter of approximately 100 nm or less), metal submicron particles (for example, metal particles having an average diameter in the range of approximately 0.1 to 1 ⁇ m), or metal Both nanoparticles and metal submicron particles can be used.
- As a material of the metal particles for example, silver, gold, or copper can be used.
- the organic dispersion material covers the surface of the metal particles at room temperature and functions to keep the metal particles in an independent dispersion state.
- the organic dispersion material trapping material functions to react with the organic dispersion material covering the metal particles at a high temperature to remove it from the surface of the metal particles.
- the volatile organic solvent functions to capture a reaction material between the organic dispersion material and the organic dispersion material capturing material and to release it as a gas.
- the pressurizing unit 100 includes a pair of transmission members 110 and 120, a guide member 130, and an interval adjustment mechanism 140.
- the pressurizing unit 100 when no pressure is applied to the pressurizing unit 100 (see FIG. 3A), it is assumed that no pressure is applied, and when a predetermined pressure is applied to the pressurizing unit 100 (FIG. 4A). Refer to)) when pressure is applied.
- the “predetermined pressure” refers to a pressure applied when the metal particle paste 4 is sintered.
- the pair of transmission members 110 and 120 includes a plate-like first transmission member 110 that contacts the substrate 1 at least when pressed, and a plate-shaped second transmission member 120 that contacts the electronic component 2 at least when pressed.
- the pair of transmission members 110 and 120 sandwich the assembly 20 when the metal particle paste 4 is sintered, and transmit pressure and heat to the assembly 20.
- the first transmission member 110 and the second transmission member 120 are made of, for example, ceramics or metal.
- the 1st transmission member 110 and the 2nd transmission member 120 consist of a plate-shaped member of a top view rectangle.
- the first transmission member 110 and the second transmission member 120 are formed of a rectangular parallelepiped member.
- the “plate-like” does not include only a completely plate-like shape (only a rectangular parallelepiped shape or a columnar shape), but may be substantially plate-like as a whole. That is, the transmission member used in the pressure unit of the present invention is not limited to the shape described above, but has a shape corresponding to the method of manufacturing the assembly or joined body (for example, for mounting the pressure unit of the present invention).
- a transmission member having a protrusion or a notch shaped to match the shape of the opening or unevenness can be used.
- the transmission member used in the pressure unit of the present invention may have a member other than a plate-like member (for example, a spacer, an abutting member that matches the shape of the electronic component, etc.) (described later). (Refer to Embodiment 2 and modifications of the above).
- a guide member receiving hole 122 corresponding to the guide member 130 is formed in the second transmission member 120.
- a total of four guide member receiving holes 122 are formed in the second transmission member 120, one at each of the four corners of the second transmission member 120.
- the second transmission member 120 is movable along the guide member 130 inserted into the guide member receiving hole 122.
- movement having the feature that “the second transmission member is movable along the guide member inserted into the guide member receiving hole” refers to relative movement with respect to the first transmission member.
- the second transmission member may be stationary and the first transmission member and the guide member may move when viewed from the outside (for example, the lower heating unit is heated above).
- the pressure unit and the assembly are pressurized by moving in the direction of the part). Even in such a case, since the second transmission member moves relative to the first transmission member, it is included in the above movement.
- the guide member receiving hole 122 is a through hole having a circular shape in a top view in accordance with the shape of the guide member 130 (a columnar shape as described later).
- the shape of the guide member receiving hole in the present invention is not limited to a circular shape in a top view, and may be a shape that matches the shape of the guide member.
- the guide member receiving hole may be a hole (a hole with a bottom) that is not a through hole.
- the guide member 130 couples the pair of transmission members 110 and 120 and can move at least one of the first transmission member 110 and the second transmission member 120 while maintaining parallelism with respect to the other transmission member.
- the guide member 130 allows the second transmission member 120 to move while maintaining parallelism with the first transmission member 110 (the expression that it is movable can be expressed as an expression that guides it). it can.).
- the pressure unit of the present invention preferably includes two or more guide members, and more preferably includes four or more guide members.
- the pressurizing unit 100 includes two or more guide members, specifically four.
- the guide member 130 When the guide member 130 is viewed from a direction perpendicular to the surface on which the substrate 1 of the first transmission member 110 is disposed, the guide member 130 has a predetermined quadrangle surrounding at least a place where the assembly 20 is to be disposed (FIG. 2A). (See the broken line indicated by the symbol Q.). In the first embodiment, a total of four guide members 130 are arranged, one at each of the four corners of the first transmission member 110.
- the guide member 130 is fixed to the first transmission member 110.
- the other end of the guide member 130 opposite to the one end is in the guide member receiving hole 122 during pressurization (see FIG. 4).
- the guide member 130 is made of a metal such as stainless steel, for example.
- the four guide members 130 all have a cylindrical shape.
- the number of guide members in the present invention is not limited to four, and may be one to three, or five or more as long as the purpose of the guide member can be achieved.
- the shape of the guide member in the present invention is not limited to a columnar shape, and other shapes (specific examples include a prismatic shape, an elliptical shape, a flat plate shape, a corrugated plate shape, an L-shape as long as the purpose of the guide member can be achieved Shape or T-shape).
- the interval adjustment mechanism 140 is a mechanism that adjusts the interval between the first transmission member 110 and the second transmission member 120.
- the spacing adjustment mechanism 140 separates the first transmission member 110 or the second transmission member 120 from the assembly 20 when the assembly 20 is between the pair of transmission members 110 and 120 and is not pressurized, and is added. When the pressure is applied, both the first transmission member 110 and the second transmission member 120 can contact the assembly 20.
- the interval adjusting mechanism 140 has an elastic member that expands when not pressed and contracts when pressed.
- the elastic member is formed of a coil spring and is arranged with the guide member 130 as an axis.
- the distance adjusting mechanism in the present invention is not limited to an elastic member, and is a member that can be shrunk when it is pressurized from non-pressurized to non-pressurized, but does not expand when it is pressurized from non-pressurized (for example, nested) A multistage pipe having a shape-like structure).
- the elastic member in the present invention is not limited to the coil spring, and a member that can withstand the temperature at the time of sintering the metal particle paste can be used.
- Specific examples of the elastic member other than the coil spring include a leaf spring and heat resistant rubber.
- the interval adjusting mechanism in the present invention may have a component other than the elastic member (for example, a member that supports the elastic member or a member that reinforces the elastic member).
- arranging the guide member as an axis” for the coil spring means that the coil spring is disposed in a state where the guide member exists in the hollow portion of the coil spring.
- the elastic member in this invention may be arrange
- the elastic member in the present invention may be arranged with a component other than the guide member as an axis, or may be arranged with only the elastic member (without the axis).
- the manufacturing method of the joined body includes the following first step S10, second step S20, and third step S30 in this order.
- the first step S10 is a step for preparing the assembly 20. Since the drawing is the same as FIG. 7, a further illustration is omitted.
- the metal particle paste 4 is applied to a predetermined place (for example, a contact point with the electronic component 2) of the substrate 1, It can be implemented by placing the electronic component 2 on the top.
- the assembly 20 is sandwiched between the pair of transmission members 110 and 120 of the pressure unit 100, and then the assembly 20 is paired with the pressure unit 100 and a pair of heating units. It is a process of arranging between 1000 and 1002.
- the assembly 20 and the pressure unit 100 are arranged directly on the heating unit 1000, but between the pair of heating units 1000 and 1002 (that is, the heating unit 1000 and the heating unit 1000). May be spaced apart).
- the heating unit 1002 on the upper side is moved toward the heating unit 1000, and the assembly 20 is heated while being pressurized by the pair of heating units 1000 and 1002 together with the pressure unit 100. Then, the metal particle paste 4 is fired to produce the joined body 10.
- the heating part 1002 may be moved and both the heating parts 1000 and 1002 may be moved.
- the transmission member is inserted between the assembly and the pair of heating units at the time of pressurization.
- the transmission member is inserted between the assembly and the pair of heating units at the time of pressurization.
- the pressurization unit 100 which concerns on Embodiment 1, since the pressurization unit 100 suppresses the unintentional heat conduction from the heating parts 1000 and 1002 to the metal particle paste 4 as mentioned above, the temperature of a heating part. Thus, it is possible to arrange the assembly without changing the position, and it is possible to prevent the production efficiency of the joined body from being significantly reduced.
- the pressurizing unit 100 can suppress a decrease in the bondability between the substrate 1 and the electronic component 2, and the production efficiency of the bonded body is significantly decreased. It becomes a pressurization unit for using for the manufacturing method of the zygote which can prevent this.
- the pressure unit 100 since the guide member 130 is provided, it is possible to maintain the parallelism between the pair of transmission members even when the pair of transmission members are moved by pressure, As a result, it is possible to suppress variation in bonding strength between locations between the substrate and the electronic component.
- the gap adjusting mechanism 140 since the gap adjusting mechanism 140 is provided, it is possible to suppress vibrations and impacts applied to the pair of transmission members during non-pressurization from being transmitted to the assembly. As a result, it is possible to prevent the positional relationship between the substrate and the electronic component from deviating.
- the gap adjusting mechanism 140 has an elastic member that expands when not pressurized and contracts when pressed, so that the pressurizing unit after firing the metal particle paste When the pressurization is released, the pair of transmission members can be automatically separated, and as a result, the assembly can be easily taken out.
- the elastic member is formed of a coil spring and is arranged with the guide member as an axis, so that the interval adjusting mechanism can be realized with a simple structure. It becomes.
- one end of the guide member 130 is fixed to the first transmission member 110, and the guide member receiving hole 122 is formed in the second transmission member 120. Since the second transmission member 120 can move along the guide member 130 inserted into the guide member receiving hole 122, the second transmission member can be moved with high accuracy using a simple configuration. .
- the other end of the guide member 130 is in the guide member receiving hole 122 during pressurization, so that the guide member is prevented from coming into contact with the heating unit.
- the pressure unit can be pressurized stably.
- the pressure unit 100 includes four or more guide members 130, and the guide members 130 are at least a predetermined quadrangle surrounding a place where the assembly 20 is to be disposed. Since it is arranged at the apex of Q, the parallelism between the pair of transmission members can be accurately maintained by the four guide members arranged at the apexes of the predetermined rectangle.
- the pressure unit 102 according to the second embodiment has basically the same configuration as the pressure unit 100 according to the first embodiment, but the configuration of the second transmission member and the configuration of the guide member are the same as those of the first embodiment. This is different from the case of the pressure unit 100. That is, as shown in FIG. 5, in the pressure unit 102 according to the second embodiment, the other end portion on the side opposite to the one end portion of the guide member 132 is from the guide member receiving hole 122 during pressurization.
- the second transmission member 150 protrudes to the side opposite to the side facing the first transmission member 110, and the second transmission member 150 has a spacer 156 that is thicker than the length of the guide member 132 protruding from the guide member receiving hole 122.
- the guide member 132 of the second transmission member 150 is provided on the protruding side.
- the second transmission member 150 includes a rectangular parallelepiped member 154 and a spacer 156.
- the rectangular parallelepiped member 154 is the same member as the rectangular parallelepiped member constituting the second transmission member 120 in the first embodiment.
- the spacer 156 is made of the same material as the rectangular parallelepiped member 154, for example.
- the spacer 156 may be completely fixed to the rectangular parallelepiped member 154 or may be configured to be removable.
- the spacer 156 has a rectangular parallelepiped shape that is slightly smaller than the rectangular parallelepiped member 154.
- the number of spacers 156 is one, but a plurality of spacers may be provided. When the number of spacers is plural, other spacers may be stacked on the spacer.
- the spacer 156 has a rectangular parallelepiped shape that is slightly smaller than the rectangular parallelepiped member 154, but the spacer in the present invention has shapes other than the above (columnar shape, polygonal columnar shape, etc.). Also good.
- the spacer may be clogged inside, or a space may exist inside.
- the guide member 132 has basically the same configuration as the guide member 130 in the first embodiment, but is longer than the guide member 130.
- the pressure unit 102 according to the second embodiment includes a pair of transmission members, although the configuration of the second transmission member and the configuration of the guide member are different from those of the pressure unit 100 according to the first embodiment. Since the pressurization unit suppresses unintended heat conduction from the heating unit to the metal particle paste, similarly to the pressurization unit 100 according to the first embodiment, the bondability between the substrate and the electronic component is reduced. It is possible to provide a pressure unit for use in a method for manufacturing a joined body capable of preventing the production efficiency of the joined body from being significantly reduced.
- the pressurizing unit 102 since the second transmission member 150 includes the spacer 156, the guide member is prevented from coming into contact with the heating unit, and the pressurizing unit is stably pressurized. Is possible.
- the pressurizing unit 102 according to the second embodiment has basically the same configuration as the pressurizing unit 100 according to the first embodiment except for the configuration of the second transmission member and the configuration of the guide member. It has the effect applicable among the effects which the pressurization unit 100 has.
- the present invention has been described using the first transmission member 110 and the second transmission member 120 made of a rectangular parallelepiped member, but the present invention is not limited to this.
- the pressurizing unit 104 heats the assembly 22 in which the electronic component 5 is disposed on the substrate 1 through the metal particle paste 4 while pressing the assembly 22 with a pair of heating units. It is a pressure unit used when baking the paste 4.
- the electronic component 5 is basically the same as the electronic component 2 in the first embodiment, but has a convex portion on the side opposite to the substrate 1 side.
- the second transmission member 160 of the pressure unit 104 basically has the same configuration as the second transmission member 120 in the first embodiment, but includes a rectangular parallelepiped member 164 and an abutting member 166.
- the rectangular parallelepiped member 164 is the same member as the rectangular parallelepiped member constituting the second transmission member 120 in the first embodiment
- the abutting member 166 is a member having a recess on the first transmission member 110 side.
- the concave portion of the abutting member 166 corresponds to the convex portion of the electronic component 5.
- the transmission member used in the pressure unit of the present invention may have a member other than a plate-shaped member or a spacer.
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Abstract
Description
基板1は、例えば、導体パターンが形成された基板である。
電子部品2は、例えば、半導体素子である。
焼成された金属粒子ペースト3は、後述する金属粒子ペースト4が焼成されたものである。
なお、基板1、電子部品2及び金属粒子ペースト4については、後述する実施形態1で詳細に説明する。
まず、図7に示すように、組立体20を準備する(第1工程)。
組立体20は、基板1に金属粒子ペースト4を介して電子部品2を配置したものである。
一対の加熱部1000,1002は、互いに対向する位置に配置されており、図示しない加熱機構により加熱されている。また、一対の加熱部1000,1002は、図示しない加圧機構部により、加熱部1002を加熱部1000に向けて移動させることにより一対の加熱部1000,1002の間に挟みこんだものを加圧することができる。
当該接合体の製造方法は、簡単にいえば、加圧ユニットを介して組立体を加圧しながら加熱するというものである(後述する各実施形態、特に実施形態1参照。)。当該接合体の製造方法によれば、加圧ユニットを用いるため、加熱部から金属粒子ペーストへの意図せぬ熱伝導を抑制することが可能であり、上記した効果を得ることが可能となる。
本発明は、上記接合体の製造方法に用いるための加圧ユニットについての発明であり、以下の要素により構成される。
実施形態1に係る加圧ユニット100は、基板1に金属粒子ペースト4を介して電子部品2を配置した組立体20を一対の加熱部1000,1002で加圧しながら加熱して金属粒子ペースト4を焼成する際に用いる加圧ユニットである。組立体20は先に説明した組立体20と同様であるため(図7参照。)、再度の図示及び説明を省略する。
本明細書における「基板」とは、電子部品を搭載する部品のことをいう。
基板1は、電子部品2を搭載する。実施形態1における基板1は、例えば、非伝導性の物質からなる本体に導体パターンが形成された回路基板である。基板1の構成材料としては、金属粒子ペースト4の焼結温度(種類にもよるが、例えば300℃)に耐えられる材料(例えば、本体であれば耐熱性の樹脂やセラミックス、導体パターンであれば金属)からなるものを用いることができる。
なお、本発明の適用対象である基板は、DCB(Direct Copper Bond)基板やリードフレームであってもよい。また、本発明の適用対象である基板は、電子部品を搭載するものであればよく、例えば、シリコンチップであってもよい。つまり、シリコンチップと導電性の接続子とを接続するのに本発明を適用することもできる。
電子部品2は、例えば、半導体素子である。
電子部品としては、上記した半導体素子(例えば、集積回路を搭載した半導体チップ)の他に、電気モーター、抵抗器、コンデンサ、圧電素子、コネクタ、スイッチ、アンテナ、導電性の接続子を例示することができる。なお、本発明の加圧ユニットは、少なくとも1つの半導体素子を基板と接合した接合体、つまり半導体装置を製造する場合に特に好適に用いることができる。また、実施形態1においては電子部品2の数は1つであるが、本発明は電子部品の数が2つ以上であっても適用することができる。電子部品の数が2つ以上である場合、電子部品は単一種類であってもよいし、複数種類であってもよい。
金属粒子としては、金属ナノ粒子(例えば、平均直径が概略100nm以下である金属粒子)、金属サブミクロン粒子(例えば、平均直径が概略0.1~1μmの範囲内にある金属粒子)、又は金属ナノ粒子及び金属サブミクロン粒子の両方を用いることができる。金属粒子の材料としては、例えば、銀、金又は銅を用いることができる。有機分散材は、常温で金属粒子の表面を覆い、金属粒子を独立分散状態に保持する働きをする。有機分散材捕捉材は、高温で、金属粒子を覆っている有機分散材と反応してこれを金属粒子表面から除去する働きをする。揮発性有機溶剤は、有機分散材と有機分散材捕捉材との反応物質を捕捉するとともに気体として系外に逃がす働きをする。
加圧ユニット100は、図2に示すように、一対の伝達部材110,120と、ガイド部材130と、間隔調整機構140とを備える。
以下の説明では、加圧ユニット100に圧力が掛かっていないとき(図3(a)参照。)を非加圧時とし、加圧ユニット100に所定の圧力が掛かっているとき(図4(a)参照。)を加圧時とする。
なお、本明細書において「所定の圧力」とは、金属粒子ペースト4を焼結するときに掛ける圧力のことをいう。
第1伝達部材110及び第2伝達部材120は、上面視長方形の板状形状の部材からなる。いいかえれば、第1伝達部材110及び第2伝達部材120は、直方体形状の部材からなる。
なお、本明細書において「板状の」とは、まったくの板状の形状(直方体形状や円柱形状のみ)からなるものだけを含むのではなく、全体的にみておおよそ板状であればよい。つまり、本発明の加圧ユニットに用いる伝達部材は上記形状のものに限られず、組立体や接合体の製造方法に応じた形状のもの(例えば、本発明の加圧ユニットを載置するためのトレイが存在し、当該トレイに加圧ユニットの位置を固定するための開口部や凹凸がある場合には、当該開口部や凹凸の形状に合わせた形状の突出部や切り欠きを有する伝達部材)を用いることができる。また、本発明の加圧ユニットに用いる伝達部材は、板状形状の部材以外の部材(例えば、スペーサー、電子部品の形状に合わせた突き当て用の部材等)を有していてもよい(後述の実施形態2及び変形例参照。)。
加圧ユニット100は、ガイド部材を2つ以上、具体的には4つ備える。ガイド部材130を第1伝達部材110の基板1を配置する面に垂直な方向からみたとき、ガイド部材130は、少なくとも、組立体20を配置すべき場所を囲む所定の四角形(図2(a)の符号Qで示す破線を参照。)の頂点に配置されている。実施形態1においては、ガイド部材130は、第1伝達部材110の四隅にそれぞれ1つずつ、計4つ配置されている。
ガイド部材130は、例えば、ステンレス鋼等の金属からなる。
また、本発明における弾性部材はコイルばねに限られるものではなく、金属粒子ペーストを焼結する際の温度に耐えられるものを用いることができる。コイルばね以外の弾性部材の具体例としては、板ばね及び耐熱性のゴムを挙げることができる。
本明細書において、コイルばねについて「ガイド部材を軸として配置する」とは、コイルばねの中空部分にガイド部材が存在する状態でコイルばねを配置することをいう。
本発明における弾性部材は、ガイド部材とは別の位置に配置されていてもよい。また、本発明における弾性部材は、ガイド部材以外の構成要素を軸として配置されていてもよいし、弾性部材のみで(軸なしで)配置されていてもよい。
上記接合体の製造方法は、以下の第1工程S10、第2工程S20及び第3工程S30をこの順序で含む。
第1工程S10は、例えば、基板1、電子部品2及び金属粒子ペースト4を準備した後、基板1の所定の場所(例えば、電子部品2との接点)に金属粒子ペースト4を塗布し、その上に電子部品2を配置することで実施することができる。
なお、実施形態1における第2工程S20においては、組立体20及び加圧ユニット100を加熱部1000の上に直接配置するが、一対の加熱部1000,1002の間に(つまり、加熱部1000とは離隔して)配置してもよい。
なお、実施形態1における第3工程S30においては、加熱部1002を移動させているが、加熱部1000を移動させてもよいし、加熱部1000,1002両方を移動させてもよい。
実施形態2に係る加圧ユニット102は、基本的には実施形態1に係る加圧ユニット100と同様の構成を有するが、第2伝達部材の構成及びガイド部材の構成が実施形態1に係る加圧ユニット100の場合とは異なる。すなわち、図5に示すように、実施形態2に係る加圧ユニット102においては、ガイド部材132の一方の端部とは反対側にある他方の端部は、加圧時にガイド部材受け穴122から第2伝達部材150の第1伝達部材110と対抗する側とは反対の側に突き出し、第2伝達部材150は、ガイド部材132がガイド部材受け穴122から突き出す長さよりも厚みがあるスペーサー156を、第2伝達部材150のガイド部材132が突き出す側に有する。
直方体形状の部材154は、実施形態1における第2伝達部材120を構成する直方体形状の部材と同様の部材である。
スペーサー156は、例えば、直方体形状の部材154と同様の材料からなる。スペーサー156は、直方体形状の部材154と完全に固定されていてもよいし、脱着可能に構成されていてもよい。スペーサー156は、直方体形状の部材154よりもひとまわり小さい直方体形状を有する。なお、実施形態2においては、スペーサー156の数は1つであるが、スペーサーの数は複数であってもよい。スペーサーの数が複数である場合には、スペーサーに他のスペーサーを重ねてもよい。また、実施形態2においては、スペーサー156は直方体形状の部材154よりもひとまわり小さい直方体形状を有するが、本発明におけるスペーサーは上記以外の形状(円柱状形状、多角柱状形状等)を有してもよい。また、スペーサーは、内部が詰まっていてもよいし、内部に空間が存在していてもよい。
ガイド部材132は、実施形態1におけるガイド部材130と基本的に同様の構成を有するが、ガイド部材130よりも長い。
Claims (7)
- 基板に金属粒子ペーストを介して電子部品を配置した組立体を一対の加熱部により加圧しながら加熱して前記金属粒子ペーストを焼成する際に用いる加圧ユニットであって、
前記加圧ユニットに圧力が掛かっていないときを非加圧時とし、前記加圧ユニットに所定の圧力が掛かっているときを加圧時とするとき、
前記加圧ユニットは、
少なくとも前記加圧時には前記基板と接触する板状の第1伝達部材及び少なくとも前記加圧時には前記電子部品と接触する板状の第2伝達部材からなり、前記金属粒子ペーストを焼結する際に前記組立体を挟み込んで前記組立体に圧力及び熱を伝達する一対の伝達部材と、
前記一対の伝達部材を連結するとともに、前記第1伝達部材及び前記第2伝達部材のうち少なくとも一方の伝達部材を他方の伝達部材に対する平行度を保ったまま移動可能とするガイド部材と、
前記第1伝達部材と前記第2伝達部材との間隔を調整する機構であり、前記組立体が前記一対の伝達部材の間にあるときにおいて、前記非加圧時には前記第1伝達部材又は前記第2伝達部材を前記組立体と離隔させ、かつ、前記加圧時には前記第1伝達部材及び前記第2伝達部材の両方を前記組立体と接触可能とする間隔調整機構とを備えることを特徴とする加圧ユニット。 - 請求項1に記載の加圧ユニットにおいて、
前記間隔調整機構は、前記非加圧時には伸び、かつ、前記加圧時には縮められる弾性部材を有することを特徴とする加圧ユニット。 - 請求項2に記載の加圧ユニットにおいて、
前記弾性部材は、コイルばねからなり、かつ、前記ガイド部材を軸として配置されていることを特徴とする加圧ユニット。 - 請求項1~3のいずれかに記載の加圧ユニットにおいて、
前記ガイド部材は、一方の端部が前記第1伝達部材に固定され、
前記第2伝達部材には、前記ガイド部材に対応するガイド部材受け穴が形成され、
前記第2伝達部材は、前記ガイド部材受け穴に差し込まれた前記ガイド部材に沿って移動可能であることを特徴とする加圧ユニット。 - 請求項4に記載の加圧ユニットにおいて、
前記ガイド部材の前記一方の端部とは反対側にある他方の端部は、前記加圧時に前記ガイド部材受け穴の中にあることを特徴とする加圧ユニット。 - 請求項4に記載の加圧ユニットにおいて、
前記ガイド部材の前記一方の端部とは反対側にある他方の端部は、前記加圧時に前記ガイド部材受け穴から前記第2伝達部材の前記第1伝達部材と対向する側とは反対の側に突き出し、
前記第2伝達部材は、前記ガイド部材が前記ガイド部材受け穴から突き出す長さよりも厚みがあるスペーサーを、前記第2伝達部材の前記ガイド部材が突き出す側にさらに有することを特徴とする加圧ユニット。 - 請求項1~6のいずれかに記載の加圧ユニットにおいて、
前記加圧ユニットは、前記ガイド部材を4つ以上備え、
前記ガイド部材を前記第1伝達部材の前記基板を配置する面に垂直な方向からみたとき、前記ガイド部材は、少なくとも、前記組立体を配置すべき場所を囲む所定の四角形の頂点に配置されていることを特徴とする加圧ユニット。
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US11152328B2 (en) * | 2018-12-13 | 2021-10-19 | eLux, Inc. | System and method for uniform pressure gang bonding |
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