Patent ID: 12250778

DESCRIPTION OF EMBODIMENTS

(1. Configuration of Circuit Board Manufacturing Device)

FIG.1illustrates circuit board manufacturing device (hereinafter, referred to as a “manufacturing device”)10according to an embodiment that embodies a circuit board manufacturing device of the present disclosure. Manufacturing device10includes conveyance device20, first shaping unit22, second shaping unit24, third shaping unit25, heating oven26, mounting unit27, and control device28(refer toFIG.2). Conveyance device20, first shaping unit22, second shaping unit24, third shaping unit25, heating oven26, and mounting unit27are arranged above base29of manufacturing device10. Base29has a generally rectangular shape, and in the following description, a longitudinal direction of base29will be referred to as an X-axis direction, a lateral direction of base29will be referred to as a Y-axis direction, and a direction orthogonal to both the X-axis direction and the Y-axis direction will be referred to as a Z-axis direction.

Conveyance device20includes X-axis slide mechanism30and Y-axis slide mechanism32. X-axis slide mechanism30includes X-axis slide rail34and X-axis slider36. X-axis slide rail34is disposed on base29such as X-axis slide rail34extends in the X-axis direction. X-axis slider36is held by X-axis slide rail34such as X-axis slider36is slidable in the X-axis direction. X-axis slide mechanism30further includes an electromagnetic motor38(refer toFIG.2), and thus X-axis slider36is moved to any position in the X-axis direction by driving electromagnetic motor38.

Y-axis slide mechanism32includes Y-axis slide rail50and stage52. Y-axis slide rail50is disposed on base29such that Y-axis slide rail50extends in the Y-axis direction. One end part of Y-axis slide rail50in the Y-axis direction is coupled to X-axis slider36. Consequently, Y-axis slide rail50is configured to be movable in the X-axis direction in accordance with a sliding movement of X-axis slider36. Stage52is held on Y-axis slide rail50such that stage52is slidable in the Y-axis direction. Y-axis slide mechanism32further includes electromagnetic motor56(refer toFIG.2), and thus stage52is moved to any position in the Y-axis direction by driving electromagnetic motor56. Consequently, stage52is moved to any position above base29by driving X-axis slide mechanism30and Y-axis slide mechanism32.

Stage52includes base plate60, holding devices62, and lifting/lowering device64. Base plate60is formed in a flat plate shape, and base member131(refer toFIG.4) is placed on an upper surface thereof. Base member131is, for example, a plate made of a metal such as iron or stainless steel. Holding devices62are provided on both side parts of base plate60in the X-axis direction. Holding device62fixedly holds base member131by sandwiching both edge portions in the X-axis direction of base member131placed on base plate60. Lifting/lowering device64is disposed below base plate60and moves up and down base plate60in the Z-axis direction.

First shaping unit22is a unit shaping a wiring on base member131, and includes ink jet head72and heater74. Ink jet head72ejects metal ink. The metal ink is, for example, one in which fine particles of a metal (silver or the like) having a nanometer size are dispersed in a solvent. Surfaces of the metal fine particles are coated with, for example, a dispersing agent to prevent aggregation in the solvent. Ink jet head72ejects the metal ink from multiple nozzles according to, for example, a piezo method using piezoelectric elements. A device ejecting the metal ink is not limited to ink jet head72including multiple nozzles, and may be, for example, a dispenser including one nozzle.

Heater74is a device heating the metal ink ejected from ink jet head72, and heats and bakes the metal ink to form cured wirings. Baking of the metal ink described here is, for example, a phenomenon in which evaporation of a solvent, decomposition of a protective film of metal fine particles, that is, a dispersing agent, or the like is performed by applying energy, so that conductivity is increased by contacting or fusing the metal fine particles. The metal ink is baked to form a metal wiring. A device heating the metal ink is not limited to heater74. For example, manufacturing device10may include a laser irradiation device that irradiates to the metal ink with laser light as a device heating the metal ink.

Second shaping unit24is a unit that shapes an insulating layer made of resin on base member131(refer toFIG.4), and includes ink jet head84and curing section86. Ink jet head84ejects an ultraviolet curable resin. The ultraviolet curable resin is a resin that is cured through irradiation with ultraviolet rays. Ink jet head84may eject the ultraviolet curable resin according to, for example, a piezo method using a piezoelectric element, or may eject the ultraviolet curable resin according to a thermal method in which air bubbles are generated by heating the ultraviolet curable resin and ejected from multiple nozzles. As the resin for forming an insulating layer, not only an ultraviolet curable resin but also another type of resin such as a thermosetting resin may be employed.

Curing section86includes planarization device90(refer toFIG.2) and irradiation device92(refer toFIG.2). Planarization device90is a device that planarizes the ultraviolet curable resin ejected by ink jet head84, and, for example, uniformizes a thickness of the ultraviolet curable resin by scraping off an excess resin with a roller or a blade while leveling the surface of the ultraviolet curable resin. Irradiation device92includes a mercury lamp or an LED as a light source, and irradiates the ejected ultraviolet curable resin with ultraviolet rays. Consequently, the ejected ultraviolet curable resin is cured, and thus an insulating layer is formed. As the additive manufacturing method in the present disclosure, not only a stereo lithography (SL), but also other methods such as a selective laser sintering (SLS) and a fused deposition molding (FDM) may be employed.

Third shaping unit25is a unit that shapes a connection section (a bump or the like) between an electrode and a wiring of an electronic component on base member131, and includes liquid droplet applicator100. Liquid droplet applicator100applies a conductive resin paste to wirings or the like. The conductive resin paste is, for example, one in which metal particles (silver or the like) having a micrometer size are dispersed in a resin to be cured by being heated. The metal particles are formed in a flake shape. As a method for applying the conductive resin paste, a method for causing liquid droplets to fly from a nozzle such as a dispenser or a method for performing contact application may be employed.

Heating oven26is, for example, an atmosphere oven, and includes a circulation device that circulates an atmospheric gas, a heating element that heats the inside of the oven, and the like. Heating oven26is a device that heats the conductive resin paste, and heats the insulating layer on which the conductive resin paste is ejected in the oven to cure the resin of the conductive resin paste. In this case, in the conductive resin paste, the cured resin shrinks, and the dispersed flake-shaped metal particles contact the resin. Consequently, the conductive resin paste becomes conductive.

As will be described later, when a circuit board is manufactured, a release film (an example of a peeling member; refer toFIG.4) may be adhered onto base member131. First shaping unit22and second shaping unit24form an insulating layer and a wiring on the release film, and additively form a circuit board. The adhesive force of the release film is reduced by being heated, and thus the release film is easily released from base member131. Heating oven26collectively heats both the conductive resin paste and the release film by heating the circuit board on which the conductive resin paste is ejected in the oven.

Heating oven26includes press device102. Heating oven26performs a heating process while pressing the circuit board with press device102. Consequently, the conductive resin paste and the release film can be heated while suppressing the occurrence of warpage in the circuit board.

Mounting unit27is a unit that mounts electronic components on a circuit board, and includes supply section110and mounting section112. Supply section110includes, for example, multiple tape feeders that feed taped electronic components one by one, and supplies the electronic component at a supply position. Supply section110is not limited to the configuration including the tape feeders, and may be a tray-type supply device that picks up an electronic component from a tray and supplies the electronic component. Supply section110may be configured to include both the tape-type supply device and the tray-type supply device, or another type of supply device.

Mounting section112includes mounting head116(refer toFIG.2) and movement device118(refer toFIG.2). Mounting head116has a suction nozzle (not illustrated) for picking up and holding an electronic component. The suction nozzle picks up and holds the electronic component by suctioning air when a negative pressure is supplied from a positive and negative pressure supply device (not illustrated). When a slight positive pressure is supplied from the positive and negative pressure supply device, the electronic component is separated. Movement device118moves mounting head116between a supply position of supply section110and base member131placed on base plate60. Mounting section112moves mounting head116, picks up and holds an electronic component supplied from supply section110with the suction nozzle of mounting head116, and mounts the picked-up and held electronic component on the circuit board.

Mounting section112includes robot arm119. Robot arm119is a device that manufactures a combined circuit board by combining circuit boards on which electronic components are mounted. Robot arm119detaches the circuit boards from release films, and combines multiple detached circuit boards to manufacture a combined circuit board.

As illustrated inFIG.2, control device28includes controller120, multiple driving circuits122, and storage device125. Multiple driving circuits122are respectively connected to the above-described electromagnetic motors38and56, holding device62, lifting/lowering device64, ink jet head72, heater74, ink jet head84, planarization device90, irradiation device92, liquid droplet applicator100, heating oven26, and mounting unit27. Controller120includes a CPU, a ROM, a RAM, and the like, and is mainly a computer, and is connected to multiple driving circuits122. Storage device125includes a RAM, a ROM, a hard disk, and the like, and stores control program127for performing control of manufacturing device10. Controller120can control operations of X-axis slide mechanism30, first shaping unit22, and the like by executing control program127with the CPU.

Manufacturing device10of the present embodiment additively forms a circuit board having an insulating layer and a wiring by curing an ultraviolet curable resin or metal ink according to the above configuration. Manufacturing device10can shape a circuit board having any shape by changing a shape of an insulating layer or a wiring to be additively formed. Manufacturing device10mounts electronic components with third shaping unit25or mounting unit27in the process of shaping. For example, three-dimensional data of each layer obtained by slicing a circuit board at the time of completion (circuit board137or combined circuit board155that will be described later) thereof is set in control program127. Controller120controls first shaping unit22or the like based on the data of control program127to eject, cure, or the like an ultraviolet curable resin to form a circuit board on which electronic components are not connected. Controller120detects information such as a layer or a position where an electronic component is arranged based on the data of control program127. Controller120controls third shaping unit25or mounting unit27based on the detected information to eject a conductive resin paste and arrange the electronic components. Controller120heats the circuit board on which the electronic components are arranged in heating oven26, and thus manufactures a desired circuit board. Thereafter, controller120controls robot arm119of mounting section112based on the data of control program127. Controller120combines multiple circuit boards to manufacture a combined circuit board by controlling robot arm119.

(2. Operation of Manufacturing Device10)

Next, an example of an operation of manufacturing device10will be described with reference toFIGS.3to9.FIG.3is a flowchart illustrating details of a manufacturing process of manufacturing a combined circuit board. For example, when receiving an instruction for starting manufacturing, control device28executes a predetermined program in control program127, and starts the manufacturing process illustrated inFIG.3. In the following description, the expression that controller120executes control program127to control each device may be simply referred to as a “device”. For example, the expression “controller120moves base plate60” means that “controller120executes control program127, controls an operation of conveyance device20via driving circuit122, and moves base plate60through an operation of conveyance device20”.

Specifically, when the manufacturing process inFIG.3is started, controller120controls conveyance device20to move base plate60on which the base member is set to first shaping unit22or second shaping unit24in step (hereinafter, simply referred to as S)11to shape a circuit board. As illustrated inFIG.4, release film133is adhered to an upper surface of base member131fixed to stage52(refer toFIG.1). Release film133has an adhesive surface as one of two surfaces, and the adhesive surface is adhered to the upper surface of base member131. An operation of adhering release film133to base member131may be automatically executed by controller120controlling robot arm119, or may be manually performed by a human.

Controller120controls second shaping unit24to eject and cure the ultraviolet curable resin, and thus additively forms an insulating layer on release film133. The surface of release film133on the opposite side to the adhesive surface (the lower surface in the illustrated example) is, for example, a non-adhesive surface having no adhesive property. Controller120additively forms a structure (an insulating layer or the like) on the non-adhesive surface. Controller120moves stage52to first shaping unit22, so that wirings are additively formed on release film133and the insulating layer by first shaping unit22. Controller120causes first shaping unit22and second shaping unit24to repeatedly execute the shaping. Consequently, as illustrated inFIG.4, circuit board137having wirings135is shaped. Wirings135are formed in a predetermined pattern, for example, on an upper surface, an inner section, and a lower surface of circuit board137.

A connection section139for electrically connecting any circuit board137to another circuit board137when the circuit boards are combined as a combined circuit board is shaped on circuit board137. Connection section139is formed in a columnar shape extending in the up-down direction, for example, with an ultraviolet curable resin, and is formed to stand on release film133. A through-hole extending in the up-down direction is formed in connection section139, and connection conductor141is formed in the through-hole. Connection conductor141is, for example, a cylindrical metal rod to which an elastic member such as a spring is attached, and is movable in the up-down direction. Controller120shapes, for example, a resin part of connection section139with second shaping unit24, moves stage52to mounting unit27, and attaches connection conductor141into the through-hole of connection section139with robot arm119. The operation of attaching connection conductor141may be manually performed by a human.

Controller120forms accommodation section142for arranging electronic components that will be described later on circuit board137. Accommodation section142has, for example, a shape in which circuit board137is recessed downward in the Z-axis direction. As illustrated inFIG.4, controller120shapes, for example, multiple circuit boards137collectively on release film133, and then executes assembly. Controller120may assemble circuit boards137shaped separately in the future.

Next, in S13inFIG.3, controller120moves stage52to third shaping unit25, controls liquid droplet applicator100, and applies a conductive resin paste. As illustrated inFIG.5, controller120controls liquid droplet applicator100to apply conductive resin paste145to wirings135of circuit board137.

Next, in S15, controller120moves stage52to mounting unit27to mount an electronic component. Controller120controls supply section110of mounting unit27to supply electronic component147(refer toFIG.6). Controller120controls movement device118of mounting section112to move mounting head116to a supply position of supply section110, so that electronic component147is picked up and held by suction nozzle149(refer toFIG.6) of mounting head116. As illustrated inFIG.6, mounting head116mounts electronic component147on accommodation section142of each circuit board137under the control of controller120. Mounting head116arranges electronic component147such that an electrode (terminal) of electronic component147is connected to wiring135of circuit board137via conductive resin paste145.

Next, in S17, controller120moves stage52to heating oven26to heat and press circuit board137. As illustrated inFIG.7, controller120controls press device102to arrange base member131below press member151of press device102. Press member151is arranged above circuit board137, and is arranged at a position opposed to base member131with circuit board137interposed therebetween in the up-down direction. Controller120moves down press member151along the Z-axis direction, for example, in a state in which the position of base member131, that is, the position of circuit board137is fixed. Circuit board137is pressed by base member131and press member151from the up-down direction. The pressure for pressing press member151toward base member131is, for example, 3 kgf (kilogram weight) per 120 mm×120 mm.

Heating oven26starts heating in the oven while pressing with press device102under the control of controller120. Consequently, in circuit board137, release film133and conductive resin paste145are collectively heated. Heating oven26may start heating first, and may start pressing when the inside of the oven reaches a predetermined temperature.

Release film133is easily released from base member131, for example, by reducing the adhesive force due to heating. Release film133is partially or entirely released, for example, from the upper surface of base member131by the application of heat. Consequently, base member131and release film133can be easily separated from each other.

Conductive resin paste145applied to circuit board137is cured by being heated, and thus the position of electronic component147with respect to circuit board137is fixed. Conductive resin paste145is heated to have high conductivity, and thus wiring135formed on the upper surface of circuit board137and an electrode of electronic component147are electrically connected to each other.

There is concern that circuit board137may be warped due to the above-described heating. Thus, circuit board137is pressed with press device102, and thus heating can be performed while correcting the warpage of circuit board137. In the heating press step in S17, press device102of the present embodiment controls heating oven26such that heating is performed by using a higher heating temperature of the heating temperature required for releasing release film133from base member131and the heating temperature required for curing conductive resin paste145. Specifically, the heating temperature required for releasing release film133from base member131is 160° C., for example. The heating temperature required for release described herein is, for example, a temperature at which a phenomenon in which release film133is released from base member131is started, or a temperature at which release film133is completely released from base member131. The heating temperature required for curing conductive resin paste145is 120° C., for example. The heating temperature required for curing described herein is, for example, a temperature required for conductive resin paste145to exhibit desired electrical characteristics to connect wiring135and electronic component147. The heating temperature required for curing is, for example, a temperature required for completely curing conductive resin paste145. In this case, heating oven26executes the heating press in S17at 160° C., which is a higher temperature of the two heating temperatures described above. Conversely, in a case where the heating temperature required for releasing release film133from base member131is higher, heating oven26executes the heating press in S17at that temperature. According to this, heating is performed at a higher heating temperature of the two heating temperatures, and thus the release of release film133and the curing of conductive resin paste145can be more reliably executed. It is possible to suppress failure of release or incomplete curing and thus to improve the quality of circuit board137after manufacturing. Heating oven26may execute the heating press in S17, for example, at an average value of the two heating temperatures, or may execute the heating press in S17at a lower heating temperature of the two heating temperatures.

Heating oven26executes heating for a longer heating time out of the heating time required for releasing release film133from base member131and the heating time required for curing conductive resin paste145in the heating press in S17. For example, in a case where the heating time required for releasing release film133from base member131is longer out of the two heating times, heating oven26continues the heating press for the longer heating time. The heating time described herein is, for example, a heating time recommended by a maker of conductive resin paste145or release film133(a heating time at a recommended temperature). Specifically, the heating time required for releasing release film133from base member131is a time period from the time at which release film133starts to be released due to the adhesive force thereof being reduced to the time at which the entire release of release film133is completed in a case where release film133is heated at the recommended temperature. The heating time required for curing conductive resin paste145is a time period from the starting of curing of conductive resin paste145to the complete completion of curing of conductive resin paste145in a case where conductive resin paste145is heated at a recommended temperature. According to this, heating is performed at a longer heating time out of the two heating times, and thus the release of release film133and the curing of conductive resin paste145can be more reliably executed, so that the quality of the circuit board after manufacturing can be improved. Heating oven26may execute the heating press in S17at an average value of the two heating times, or may execute the heating press in S17at a shorter heating time out of the two heating times, for example.

Therefore, in manufacturing device10of the present embodiment, base member131, release film133, circuit board137, and press member151are placed in heating oven26, and release film133and conductive resin paste145are heated. According to this, circuit board137and the like are placed in heating oven26and heated while being pressed. Consequently, entire circuit board137can be heated, and thus the release of release film133and the curing of conductive resin paste145can be performed more reliably.

Next, in S19, controller120moves stage52to mounting unit27, and circuit board137is detached from release film133. As illustrated inFIG.8, robot arm119of mounting section112detaches any circuit board137, for example, from release film133and base member131under the control of controller120. In a case where circuit board137is attached to release film133when circuit board137is detached, mounting head116may use presser rod157or the like to press release film133against base member131to detach circuit board137from release film133, as illustrated inFIG.8. Robot arm119may rotate circuit board137about a rotation axis along the Z-axis direction such that circuit board137is released from release film133.

Robot arm119assembles combined circuit board155by using detached circuit board137(S21). As illustrated inFIG.9, robot arm119arranges detached circuit board137on assembling table153(refer toFIG.9) of mounting section112. Robot arm119arranges circuit board137that has been detached on or beside circuit board137arranged on assembling table153(arranged on the upper side in the illustrated example). Robot arm119fixes arranged multiple circuit boards137to each other to manufacture combined circuit board155. A method for fixing multiple circuit boards137is not particularly limited, but, for example, an adhesive, a screw, a bolt, or the like may be used. The fixing operation may be automatically executed by robot arm119or may be manually executed by a human. Assembled multiple circuit boards137are electrically connected to each other via connection conductors141of connection section139. Connection conductor141includes an attached elastic member, and thus absorbs shock at the time of assembling.

A structure of combined circuit board155is not particularly limited. For example, controller120may manufacture combined circuit boards155having various shapes or structures based on information (three-dimensional data or the like) of combined circuit board155set in control program127. When the assembling operation in S21is completed, controller120discharges assembling table153to the outside of manufacturing device10. A user can acquire completed combined circuit board155. Controller120finishes the manufacturing process illustrated inFIG.3.

Therefore, manufacturing device10of the present embodiment combines circuit board137detached from release film133with another circuit board137and manufacture combined circuit board155including multiple circuit boards137. According to this, by combining multiple circuit boards137in which the heat damage is reduced while correcting the warpage, it is possible to accurately assemble circuit boards137while suppressing positional deviation of multiple circuit boards137. Therefore, desired combined circuit board155can be manufactured with good precision.

According to the above embodiment, the following advantages can be achieved. Controller120of manufacturing device10additively forms circuit board137on release film133adhered to base member131(S11), and attaches conductive resin paste145to wirings135of circuit board137(S13). Controller120arranges electronic component147on circuit board137to arrange electronic component147and circuit board137via conductive resin paste145(S15). Controller120controls heating oven26to collectively heat release film133and conductive resin paste145while pressing circuit board137with base member131and press member151(S17).

Consequently, release film133and conductive resin paste145are collectively heated while correcting the warpage of circuit board137due to the heating by the pressing of base member131and press member151. The two heating steps including the step of heating release film133and the step of heating conductive resin paste145can be combined to heat circuit board137while suppressing warpage of circuit board137. By reducing the number of heating steps, it is possible to reduce the influence of thermal stress on circuit board137(such as damage to the board due to heat or release of a wiring) and thus to improve the quality of circuit board137after manufacturing. By reducing the number of manufacturing steps, the production efficiency can be improved, and thus the manufacturing cost can be reduced.

As illustrated inFIG.2, controller120of control device28includes board shaping section161, attachment section162, an electronic component arrangement section163, heating press section164, and circuit board assembling section165. Board shaping section161is a functional section that causes first shaping unit22and second shaping unit24to additively form circuit board137having wirings135on release film133adhered to base member131. Attachment section162is a functional section that attaches conductive resin paste145contacting wiring135to circuit board137. Electronic component arrangement section163is a functional section that causes mounting head116to arrange electronic component147on circuit board137such that electronic component147and wiring135are arranged via conductive resin paste145. Heating press section164is a functional section that arranges press member151above circuit board137, causes heating oven26to move press member151, and presses circuit board137with base member131and press member151to correct the warpage of circuit board137. Heating press section164is a functional section that releases release film133from base member131and cures conductive resin paste145by collectively heating release film133and conductive resin paste145with heating oven26while correcting the warpage. Circuit board assembling section165is a functional section that manufactures combined circuit board155including multiple circuit boards137by combining circuit board137detached from release film133with another circuit board137.

In the above embodiment, controller120is an example of a control device. Release film133is an example of a peeling member. Conductive resin paste145is an example of a metal paste. First shaping unit22and second shaping unit24are examples of an additive manufacturing device. Heating oven26is an example of a heating press device. Controller120is an example of a control device. The process in S11is an example of a board shaping step. The process in S13is an example of an attachment step. The process in S15is an example of an electronic component arrangement step. The process in S17is an example of a heating press step. The process in S21is an example of a circuit board assembling step.

The present application is not limited to the above examples, and may be implemented in various aspects in which various changes and improvements are made based on the knowledge of those skilled in the art. For example, a material used in the additive manufacturing method may be changed as appropriate. For example, the insulating layer of circuit board137may be shaped by using a thermosetting resin instead of an ultraviolet curable resin. As a metal used for wiring135or conductive resin paste145, a metal (gold, copper, or the like) other than silver may be used. In the above embodiment, wiring135is formed of metal ink, but wiring135may be formed of conductive resin paste145. The structure of circuit board137described above is an example. For example, accommodation section142of circuit board137is not limited to a structure in which electronic component147is inserted from the top, but may have a structure in which electronic component147is inserted from the side. Circuit board137does not have to include accommodation section142. For example, circuit board137may have a configuration in which a lower surface is recessed, an upper surface is formed in a plane, and electronic component147is arranged on the upper surface thereof. A recessed section of another circuit board137may be assembled on the upper surface of any circuit board137. In the above embodiment, conductive resin paste145is applied by liquid droplet applicator100, but may be ejected by a dispense head. Conductive resin paste145may be printed through screen printing. The peeling member of the present disclosure is not limited to a film-like member, and various members having adhesiveness and of which the adhesiveness is reduced through application of heat may be employed.

In the above embodiment, the heating of release film133and conductive resin paste145is executed in heating oven26, but is not limited to this. For example, as illustrated inFIG.10, release film133and conductive resin paste145may be heated by heating base member131and press member151. Although a method for heating base member131and press member151is not particularly limited, for example, base member131and press member151may be formed of a metal plate and warmed by a halogen heater. Alternatively, a current may be caused to flow through base member131or the like to warm base member131or the like. Heat may be transmitted from base member131and press member151to circuit board137, and thus conductive resin paste145may be heated. Heat may be transmitted from base member131to release film133, and thus the adhesive force may be reduced.

Therefore, release film133and conductive resin paste145may be heated by heating base member131and press member151. Consequently, heat is applied from both base member131and press member151to circuit board137and release film133, and thus circuit board137and the like can be more uniformly heated such that the release of release film133and the curing of conductive resin paste145can be executed more reliably. Both the method for heating with heating oven26and the method for heating base member131and press member151described above may be used. For example, heating may be performed by causing a current to flow to base member131and press member151in heating oven26.

In the above embodiment, the pressing of circuit board137is executed by press device102, but is not limited to this. For example, as illustrated inFIG.11, weight171may be placed on press member151, and pressing may be executed through weighting using weight171. The work of placing weight171on press member151may be automatically executed by robot arm119or the like, or may be manually performed by a human.

As illustrated inFIG.11, in a case where heights of multiple shaped circuit boards137are different from each other, or as illustrated inFIG.12, in a case where sections having different heights are formed on one circuit board137, heating press may be performed with adjustment member173for adjusting a height interposed between circuit board137and press member151. Adjustment member173is preferably a member having heat resistance, and may be, for example, a member obtained by overlapping a tape formed of a heat-resistant material such as polyimide. Alternatively, adjustment member173may be an elastic member such as heat-resistant rubber. The work of arranging adjustment member173may be automatically performed by placing adjustment member173on circuit board137by using robot arm119or the like, or may be manually performed by a human.

In the additive manufacturing method, not only circuit boards137having the same height but also circuit boards137having different heights or circuit boards137having partially different heights may be shaped in accordance with the purpose. For example, a height and a shape of each circuit board137may be changed in accordance with a shape of an article to which combined circuit board155is to be mounted, or a height of circuit board137may be partially reduced in order to reduce the material cost. On the other hand, when circuit boards137having different heights are to be pressed, there is concern that a gap may be formed between press member151and circuit board137and thus the warpage of circuit board137cannot be appropriately corrected. Therefore, as illustrated inFIGS.11and12, by interposing adjustment member173between circuit board137and press member151and performing heating press, it is possible to apply a pressing force from press member151to circuit board137via adjustment member173, and thus the warpage of circuit board137can be appropriately corrected.

As illustrated inFIG.12, multiple press devices102or weight171(refer toFIG.11) may be used to press circuit boards137having different heights in whole or in part by each press device102or the like. That is, in a case where multiple circuit boards137are collectively heated, each circuit board137may be pressed individually. Sections having different heights in one circuit board137may be pressed by respective press devices102. The configuration of manufacturing device10illustrated inFIG.1andFIG.2in the above embodiment is an example. For example, manufacturing device10does not have to include heating oven26or robot arm119. In this case, the heating process or the assembling process may be performed in a device different from manufacturing device10.

REFERENCE SIGNS LIST

10: Circuit board manufacturing device,22: First shaping unit (additive manufacturing device),24: Second shaping unit (additive manufacturing device),26: Heating oven (heating press device),28: Control device,116: Mounting head,120: Controller (control device),131: Base member,133: Release film (peeling member),145: Conductive resin paste (metal paste),151: Press member,155: Combined circuit board,161: Board shaping section (board shaping step),162: Attachment section (attachment step),163: Electronic component arrangement section (electronic component arrangement step),164: Heating press section (heating press process),165: Circuit board assembling (circuit board assembling step),173: Adjustment member