WO2012164957A1 - 電子部品実装方法、電子部品搭載装置および電子部品実装システム - Google Patents
電子部品実装方法、電子部品搭載装置および電子部品実装システム Download PDFInfo
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- WO2012164957A1 WO2012164957A1 PCT/JP2012/003626 JP2012003626W WO2012164957A1 WO 2012164957 A1 WO2012164957 A1 WO 2012164957A1 JP 2012003626 W JP2012003626 W JP 2012003626W WO 2012164957 A1 WO2012164957 A1 WO 2012164957A1
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Definitions
- the present invention relates to a method and apparatus for mounting or mounting an electronic component having a plurality of bumps on a substrate.
- Various electronic components are incorporated in the electronic device, and these electronic components are incorporated in the device as a mounting structure in a state of being bonded to a predetermined position of a substrate having a plurality of electrodes and a lead frame. .
- electronic components incorporated in the devices have been reduced in size. Therefore, small electronic components such as flip chips and chip size packages (CSP) are often mounted on a substrate. It has become to.
- CSP flip chips and chip size packages
- Electronic parts such as flip chip and CSP have a main surface on which a plurality of terminals are regularly arranged, and solder bumps are formed on each terminal.
- the bump In order to mount such an electronic component on a substrate, the bump is landed on an electrode of a substrate called a land, heated, melted (reflowed), and then allowed to cool, thereby allowing the electronic component and the substrate to be mounted. Interconnections are made. Thereby, each terminal of the electronic component is electrically connected to the electrode of the substrate, and the electronic component is held on the substrate by the solder joint portion.
- chip resistors In addition to electronic components such as flip chips and CSPs, electronic components called chip resistors, chip LEDs, chip capacitors, and the like are often mounted on the mounting structure.
- Such an electronic component is mounted on the electrode to which the paste is applied after applying a paste (for example, cream solder) containing metal particles to the electrode of the substrate by a technique such as screen printing. Thereafter, the electronic particles are bonded to the substrate by melting the metal particles by reflow and allowing to cool.
- a paste for example, cream solder
- the paste containing the metal particles is applied to the electrode of the substrate before the electronic component such as flip chip or CSP is mounted on the substrate.
- Patent Document 1 first, a reinforcing resin is applied to a position on a substrate corresponding to a peripheral portion of an electronic component. Next, an electronic component having a plurality of bumps to which flux has been applied in advance is mounted on the substrate such that the plurality of bumps land on the corresponding electrodes. At this time, when the reinforcing resin comes into contact with the peripheral portion of the electronic component, the reinforcing resin functions as an adhesive that fixes the electronic component to the substrate until the reflow process. Further, after the reflow, the reinforcing resin becomes a reinforcing portion for the solder joint portion.
- the reinforcing resin when the reinforcing resin is applied to the substrate, some of the electrodes 102a may be covered with the reinforcing resin 105 as shown in FIG.
- the electronic component 200 becomes smaller, the position on the substrate 101 corresponding to the peripheral edge 201x of the electronic component 200 approaches the electrode 102a, so that the reinforcing resin 105 is applied to the substrate 101 while avoiding contact with the electrode 102a. Things are getting harder.
- the flux 206 applied to the bump 204 is sufficiently wetted and spreads to the electrode 102a.
- the most part of the electrode 102 a remains wet with the reinforcing resin 105.
- the resin reinforcement is provided between the bumps 204 after cooling and the electrode 102a.
- the part 105a intervenes, resulting in poor bonding of the solder joint (conducting failure and insufficient bonding strength).
- a flux 206 is applied in advance to the electrode 102a and then a reinforcing resin 105 is applied to the substrate 101 by a dispensing method or the like.
- the flux 206 applied to the electrode 102 a is applied to the bump 204 as shown in FIG.
- most of the bump 204 remains wet with the reinforcing resin 105. Therefore, the bumps melted at the time of reflow cannot wet and spread on the electrode 102a, and as shown in FIG. 2 (c), the resin reinforcing portion 105a is interposed between the bump 204 after being allowed to cool and the electrode 102a. Become.
- an object of the present invention is to provide an electronic component mounting method, an electronic component mounting apparatus, and an electronic component mounting system that can avoid a bonding failure between an electronic component and a substrate.
- a first electronic component having a main surface provided with a plurality of bumps is mounted on a substrate having a mounting region provided with a plurality of first electrodes corresponding to the plurality of bumps.
- An electronic component mounting method Preparing the first electronic component; Preparing the substrate; Applying a flux to the plurality of bumps; Applying flux to the first electrode adjacent to at least one reinforcing position set at the peripheral edge of the mounting region; Applying a thermosetting resin to the reinforcing position and covering at least a part of the first electrode to which the flux adjacent to the reinforcing position is applied with the thermosetting resin;
- the first electronic component is mounted on the substrate so that the plurality of bumps to which the flux is applied land on the corresponding first electrode, and the thermosetting resin applied to the reinforcing position is Contacting the peripheral edge of the first electronic component; Heating the substrate on which the first electronic component is mounted, melting the bump, curing the thermosetting resin, and allowing to cool, thereby bond
- the step of applying the flux to the first electrode includes, for example, (a) transferring the flux to the first electrode by landing a plurality of bumps coated with the flux on the corresponding first electrode, respectively. And (b) retracting the first electronic component from the substrate after transferring the flux to the first electrode.
- the step of mounting the first electronic component on the substrate is a step of mounting the retracted first electronic component on the substrate.
- a first electronic component having a main surface provided with a plurality of bumps is mounted on a substrate having a mounting region provided with a plurality of first electrodes corresponding to the plurality of bumps.
- An electronic component mounting device A first component supply unit for supplying the first electronic component; A substrate holding unit for holding and positioning the substrate; A transfer unit for supplying a coating film of flux; A movable mounting head for mounting the supplied first electronic component on the substrate; A movable application head for applying a thermosetting resin to at least one reinforcing position set in a peripheral portion of the mounting region of the substrate; A control unit for controlling movement and operation of the mounting head and the coating head; Comprising By the command of the control unit,
- the mounting head is (I) transferring the flux from the coating film of the flux supplied by the transfer unit to the plurality of bumps of the first electronic component; (Ii) transferring the flux to the first electrode by landing a plurality of bumps onto which the flux has been transferred to the corresponding first electrode, (
- a first electronic component having a main surface provided with a plurality of bumps is mounted on a substrate having a mounting area provided with a plurality of first electrodes corresponding to the plurality of bumps.
- An electronic component mounting device A first component supply unit for supplying the first electronic component; A substrate holding unit for holding and positioning the substrate; A transfer unit for supplying a coating film of flux; A movable mounting head for mounting the supplied first electronic component on the substrate; A movable application head for applying a thermosetting resin to at least one reinforcing position set in a peripheral portion of the mounting region of the substrate; A transfer tool having a transfer surface corresponding to the first electrode adjacent to the reinforcing position; A control unit for controlling movement and operation of the mounting head and the coating head; Comprising By the command of the control unit, The mounting head is (I) transferring the flux from the coating film of the flux supplied by the transfer unit to the transfer surface of the transfer tool; (Ii) transferring the flux to the first electrode by landing the transfer
- a first electronic component having a main surface provided with a plurality of bumps and a second electronic component having a connection terminal are provided with a plurality of first electrodes corresponding to the plurality of bumps.
- An electronic component mounting system for mounting on a substrate having a first mounting region and a second mounting region provided with a second electrode corresponding to the connection terminal, A substrate supply device for supplying the substrate; A screen printing device for applying a paste containing metal particles to the second electrode of the substrate carried out of the substrate supply device by screen printing; An electronic component mounting apparatus for mounting the first electronic component on the first mounting area of the substrate unloaded from the screen printing apparatus and mounting the second electronic component on the second mounting area; A reflow device that heats the substrate carried out of the electronic component mounting device, melts the bumps and metal particles, and cures the thermosetting resin.
- the electronic component mounting device is A first component supply unit for supplying the first electronic component; A second component supply unit for supplying the second electronic component; A substrate holding unit for holding and positioning the substrate; A transfer unit for supplying a coating film of flux; A movable mounting head for mounting the supplied first electronic component and second electronic component on the substrate; A movable application head for applying a thermosetting resin to at least one reinforcing position set at a peripheral edge of the first mounting region of the substrate; A control unit for controlling movement and operation of the mounting head and the coating head; Comprising By the command of the control unit,
- the mounting head is The second electronic component is mounted on the substrate such that the connection terminal is landed on the second electrode via a paste containing the metal particles, and the mounting head is (I) transferring the flux from the coating film of the flux supplied by the transfer unit to the plurality of bumps of the first electronic component; (Ii) transferring the flux to the first electrode by landing a plurality of bumps onto which the flux has been transferred to the corresponding first electrode, (Ii
- a first electronic component having a main surface provided with a plurality of bumps and a second electronic component having a connection terminal are provided with a plurality of first electrodes corresponding to the plurality of bumps.
- An electronic component mounting system for mounting on a substrate having a first mounting region and a second mounting region provided with a second electrode corresponding to the connection terminal, A substrate supply device for supplying the substrate; A screen printing device for applying a paste containing metal particles to the second electrode of the substrate carried out of the substrate supply device by screen printing; An electronic component mounting apparatus for mounting the first electronic component on the first mounting area of the substrate unloaded from the screen printing apparatus and mounting the second electronic component on the second mounting area; A reflow device that heats the substrate carried out of the electronic component mounting device, melts the bumps and metal particles, and cures the thermosetting resin.
- the electronic component mounting device is A first component supply unit for supplying the first electronic component; A second component supply unit for supplying the second electronic component; A substrate holding unit for holding and positioning the substrate; A transfer unit for supplying a coating film of flux; A movable mounting head for mounting the supplied first electronic component and second electronic component on the substrate; A movable application head for applying a thermosetting resin to at least one reinforcing position set at a peripheral edge of the first mounting region of the substrate; A transfer tool having a transfer surface corresponding to the first electrode adjacent to the reinforcing position; A control unit for controlling movement and operation of the mounting head and the coating head; Comprising By the command of the control unit, The mounting head is The second electronic component is mounted on the substrate such that the connection terminal is landed on the second electrode via a paste containing the metal particles, and the mounting head is (I) transferring the flux from the coating film of the flux supplied by the transfer unit to the transfer surface of the transfer tool; (Ii) transferring the flux to the first electrode by landing the transfer surface on which the flux
- thermosetting resin supplied as the reinforcing resin covers the electrode provided on the substrate, it melts during reflow. Since the electrodes are sufficiently wetted by the bumps, it is possible to avoid poor bonding at the solder joints.
- FIG. It is explanatory drawing which shows the process of apply
- FIG. 3 is a sectional view of the same transfer unit taken along line XX.
- the substrate electrode is made of paste containing metal particles such as cream solder.
- BGA ball grid array
- the substrate electrode is made of paste containing metal particles such as cream solder.
- FIG. 3A is a longitudinal sectional view of an example of the first electronic component 200
- FIG. 3B is a bottom view thereof.
- the first electronic component 200 is a package including a thin substrate (in-component substrate) 201, a semiconductor element 202 mounted on the upper surface thereof, and a sealing resin 203 that covers the semiconductor element 202.
- the lower surface of the component internal substrate 201 forms a main surface 201s of the first electronic component, and a plurality of terminals are regularly arranged in a matrix on the main surface 201s, and bumps 204 are provided on each terminal.
- the structure of the first electronic component is not limited to the structure shown in FIGS. 3A and 3B. For example, various types of components such as flip chip and chip size package (CSP) are included in the first electronic component.
- CSP flip chip and chip size package
- FIG. 4 is a perspective view of an example of the second electronic component 210 mounted on the substrate together with the first electronic component 200.
- the second electronic component is a chip component having at least one connection terminal 211, such as a chip resistor, a chip LED, or a chip capacitor.
- the substrate 101 includes a first mounting region provided with a plurality of first electrodes 102 a connected to a plurality of bumps 204 of the first electronic component 200, and terminals of the second electronic component 210. 2nd mounting area in which the 2nd electrode 102b connected with 211 was provided.
- at least one reinforcing position 104 is set in the peripheral portion of the first mounting region for the first electronic component 200, that is, the region corresponding to the peripheral portion 201 x of the first electronic component 200.
- a plurality of reinforcing positions 104 are usually set at the periphery of the first mounting area of the substrate 101.
- the peripheral portion of the first mounting region of the substrate 101 is a frame-shaped region set on the substrate along the outer shape of the main surface 201 s having the plurality of bumps of the first electronic component 200.
- the reinforcing position 104 is set at a predetermined location in the frame-like region.
- the shape of the main surface 201s of a general BGA type first electronic component 200 is a rectangle. In the rectangular first electronic component, it is preferable to set a plurality of reinforcing positions so as to correspond to at least the four corners or the vicinity thereof.
- a paste 103 for example, cream solder
- the paste 103 containing metal particles is applied by shielding the first electrode 102a with a mask.
- the same paste can be applied to both the first electrode 102a and the second electrode 102b by a single screen printing.
- the case where such a method is possible is limited, and when the heights of the first electrode 102a and the second electrode 102b are different from each other, or the required paste of the first electronic component 200 and the second electronic component 210 The thickness of the coating is often different.
- flux 206 is applied to the bumps 204 of the first electronic component 200.
- the method of applying the flux to the bump 204 is not particularly limited.
- a coating film of the flux 206 is formed on a predetermined transfer table, and the bump 204 of the first electronic component 200 is brought into contact with the coating film.
- the flux 206 may be attached (transferred). Thereby, the flux 206 is evenly applied to the bumps 204 of the first electronic component 200.
- the thickness of the coating film of the flux may be appropriately adjusted in consideration of the size of the bump 204 and the coating amount per bump.
- the bumps 204 coated with the flux 206 of the first electronic component 200 are landed on the corresponding first electrodes 102a.
- the flux 206 is applied to all the first electrodes 102a including the first electrode adjacent to the reinforcing position 104 by transfer.
- the first electronic component 200 is pulled up from the first electrode 102 a, and the first electronic component 200 is temporarily retracted from the substrate 101.
- the movement of the first electronic component 200 as described above may be performed using a mounting head that is movable in various directions installed in a predetermined electronic component mounting apparatus.
- a reinforcing resin 105 is applied to a plurality of reinforcing positions 104 set at the peripheral edge portion of the first mounting region for the first electronic component 200.
- the reinforcing resin 105 At the time of applying the reinforcing resin 105, at least a part of the first electrode 102 a adjacent to the reinforcing position 104 among the plurality of first electrodes 102 a to which the flux 206 is applied is covered with the reinforcing resin 105.
- the application of the reinforcing resin 105 may be performed using an application head that is movable in various directions installed in a predetermined electronic component mounting apparatus.
- a reinforcing resin is applied so as to correspond to at least the four corners or the vicinity thereof.
- a large reinforcing effect can be obtained even when a small amount of reinforcing resin is used.
- the balance of reinforcement is good, it is easy to reduce the stress generated in the solder joint when the first electronic component receives an impact.
- the reinforcing resin 105 reinforces only the outermost first electrode 102a among the first electrodes 102a in the vicinity of the peripheral edge 201x of the first electronic component 200, that is, the regularly arranged first electrodes 102a. It is desirable to cover with the resin 105 for use. In addition, it is preferable that a part of the first electrode 102a (for example, an edge) is covered with the reinforcing resin 105, if possible, instead of the entire first electrode 102a. Thereby, when repair is necessary, the labor for repair is reduced, and the amount of the reinforcing resin 105 used is also small, which is more economical.
- the first electronic component 200 that has been withdrawn earlier is moved again above the first electrode 102a of the substrate 101, and as shown in FIG.
- the first electronic component 200 is mounted on the substrate 101 so that the bumps 204 land on the corresponding first electrodes 102a.
- the reinforcing resin 105 is brought into contact with the peripheral edge portion 201 x of the first electronic component 200.
- the reinforcing resin 105 functions as an adhesive for fixing the first electronic component to the substrate 101 until the reflow process, and after the reflow, the reinforcing resin 105 is cured to become a resin reinforcing portion.
- the flux 206 may be attached to the bump 204 by transfer again before mounting on the substrate 101.
- FIG. 7 shows the case where the reinforcing resin 105 covers only the edge of the first electrode 102a.
- the entire first electrode 102a is reinforced as shown in FIGS.
- the resin 105 is easily covered.
- the bump 204 coated with the flux 206 is landed on the first electrode 102a coated with the flux 206 in advance. 1 and 2 prevents the bonding failure as shown in FIGS. This is because when the first electronic component 200 is mounted on the substrate 101 or as the viscosity of the reinforcing resin 105 decreases in the subsequent reflow process, as shown in FIG.
- the flux 206 applied to the solder and the flux 206 adhering to the bump 204 are connected to promote the wetting of the melted bump to the electrode. Thereby, it is considered that the bumps melted at the time of reflow can wet and spread on the electrode while pushing away the reinforcing resin 105.
- the flux 206 adheres only to the tip of the bump 204, so that only the oxide present at the tip can be removed, and a large amount of oxide remains on the surface of the bump 204.
- the remaining oxide thus inhibits the melted bumps from pushing away the reinforcing resin 105 and spreading to the first electrode 102a.
- an extreme constriction is formed in the middle of the solder joint portion, which tends to cause a joint failure.
- the flux 206 applied to the first electrode 102a and the bumps 204 are attached as shown in FIG. 8B. It is important that the flux 206 is connected. When reflow is performed in such a state, it becomes easy for the melted bumps to push away the reinforcing resin 105. As a result, the melted bumps are sufficiently wetted and spread on the first electrode 102a, and no extreme constriction is formed in the solder joint portion, thereby avoiding joint failure.
- the second electronic component 210 is mounted on the substrate 101 (FIG. 7C). Specifically, the second electronic component 210 is mounted on the substrate 101 so that the connection terminal 211 is landed on the second electrode via the paste 103 containing metal particles.
- the mounting of the second electronic component 210 may be performed before or after the mounting of the first electronic component 200, and may be performed simultaneously with the mounting of the first electronic component 200 if possible.
- the electronic component mounting method of the present invention is not limited to the case where the first electronic component 200 and the second electronic component 210 are mounted on the substrate 101.
- the second electronic component 210 may be mounted on the substrate 101 as necessary, and the step of mounting the second electronic component 210 on the substrate 101 is not essential for the electronic component mounting method of the present invention. That is, the substrate 101 does not necessarily have the second electrode 102b. Therefore, the process of applying the paste 103 containing metal particles to the second electrode 102b is not essential.
- the substrate 101 on which the first electronic component 200 and the second electronic component 210 are mounted is heated by the reflow apparatus.
- the molten bump wets and spreads on the electrode while pushing away the reinforcing resin 105, so that the contact area between the bump and the electrode after cooling is increased. Thereby, sufficient intensity
- FIG. 9B the shape of the bump 204 is slightly deformed, and the distance between the first electronic component 200 and the first electrode 102a is shortened.
- the displacement is eliminated by the self-alignment effect before the reinforcing resin 105 is cured.
- the effect of self-alignment is also enhanced.
- the reinforcing resin 105 is cured after the bump 204 and the metal particles are melted to form a resin reinforcing portion 105a. Thereby, reinforcement of the solder joint is achieved. Further, when a thermosetting flux is used as the flux 206, a cured product 206a of the flux is formed. In this case, the flux cleaning step may be omitted.
- the region where the reinforcing resin 105 is applied is not particularly limited.
- the reinforcing resin 105 may be applied to the entire region between the component internal substrate 201 and the substrate 101 of the first electronic component 200. Also in this case, since the state shown in FIG. 8B is achieved between each first electrode 102a and each bump 204, the strength of the solder joint is ensured in the same manner as described above.
- the method of applying the flux 206 to the first electrode 102a is not limited to the method using the bumps 204 of the first electronic component 200.
- the flux 206 may be applied to the first electrode 102a by a dispensing method using a multi-point nozzle or a transfer method using a transfer tool having a transfer surface corresponding to the first electrode 102a.
- the flux 206 may be applied only to the first electrode 102a having the above. Further, the flux applied to the first electrode 102a and the flux applied to the bump 204 of the first electronic component 200 do not need to be the same material.
- the transfer tool only needs to have a transfer surface corresponding to the first electrode 102a adjacent to the reinforcing position 104, but may have a transfer surface corresponding to the other first electrode 102a. That is, a transfer tool that can selectively apply a flux to the first electrode 102a adjacent to the reinforcing position 104 or a part of the first electrode 102a including the first electrode 102a may be used, and the flux 206 is applied to all the first electrodes 102a. A transfer tool that can be used may be used.
- FIG. 10A is a front view of an example of a transfer tool.
- FIG. 10B shows a process of transferring the flux 206 to the first electrode 102 a of the substrate 101 by the transfer tool 220.
- Convex portions 222 are formed in a predetermined pattern on the bottom surface of the transfer tool 220.
- the formation pattern of the protrusions 222 may be appropriately selected according to the pattern of the reinforcing positions 104 set on the substrate 101. For example, you may have the convex part 222 of the same number as the 1st electrode 102a.
- the top surface of the convex portion 222 becomes a transfer surface 223 to which the flux 206 is attached.
- the transfer surface may be a flat surface or a curved surface.
- the flux is applied to the first electrode 102a by applying the flux 206 to the transfer surface 223 of the transfer tool 220 and then landing the transfer surface 223 on the corresponding first electrode 102a. After the flux is applied to the first electrode 102a, the transfer tool 223 is retracted from the first electrode 102a.
- the method of applying the flux 206 to the transfer surface 223 is not particularly limited.
- a coating film of the flux 206 is formed in the same manner as when the flux 206 is applied to the bumps 204 of the first electronic component 200.
- the transfer surface 223 may be brought into contact with the coating film, and the flux 206 may be attached (transferred) to the transfer surface 223.
- This modification is the same as the embodiment in which flux is applied (transferred) to the first electrode 102a using the first electronic component 200, except that the flux is applied (transferred) to the first electrode 102a using the transfer tool 220. It is. That is, after the flux is applied to the first electrode 102a, the reinforcing resin 105 is applied to the reinforcing position 104, and then the first electronic component 200 in which the flux 206 is previously applied to the bumps is mounted on the substrate 101.
- FIG. 11 shows an overview of an example of an electronic component mounting system for carrying out the electronic component mounting method of the present invention.
- the electronic component mounting system 300 includes a substrate supply device 301 that supplies a substrate for mounting an electronic component, and metal particles by screen printing on a predetermined electrode (second electrode 102b) of the substrate unloaded from the substrate supply device 301.
- the first electronic component is mounted on an electrode (first electrode 102a) different from the predetermined electrode of the substrate carried out of the screen printing apparatus 302 and the substrate carried out of the screen printing apparatus 302;
- the electronic component mounting apparatus 303 for mounting the second electronic component on the electrode coated with paste, and the substrate unloaded from the electronic component mounting apparatus 303 are heated to place the first electronic component and the second electronic component on the substrate.
- a reflow device 304 to be joined.
- the board carried out from the reflow apparatus 304, that is, the mounting structure is collected by the board collection apparatus 305.
- FIG. 12 is a configuration diagram of the electronic component mounting apparatus 303 constituting the electronic component mounting system 300 as viewed from above.
- the electronic component mounting apparatus 303 holds the base 303a, the first component supply unit 307 that supplies the first electronic component 200, the second component supply unit 308 that supplies the second electronic component 210, and the substrate 101.
- a movable coating head 312 that supplies a thermosetting resin as the resin 105, and a control unit 313 that controls the movement and operation of the mounting head 311 and the coating head 312 are provided.
- a first component supply unit 307, a second component supply unit 308, a substrate holding unit 309, and a transfer unit 310 are arranged on the base 303a. Further, the mounting head 311 and the coating head 312 are supported by a dedicated XY movement mechanism (not shown), and move in the space above the base 303a by the control of the XY movement mechanism by the control unit 313.
- the electronic component mounting apparatus 303 may be provided with a transfer tool 220 having a transfer surface for transferring a flux coating film.
- the structure of the first component supply unit 307 is not particularly limited.
- the first component supply unit 307 includes a tray feeder that supplies a tray on which a plurality of first electronic components 200 arranged in a lattice shape is mounted to the pickup position of the mounting head 311. To do.
- the first electronic component 200 is a BGA type relatively small electronic component having a main surface 201s provided with a plurality of bumps 204 as shown in FIGS. 3A and 3B.
- the structure of the second component supply unit 308 is not particularly limited.
- the second component supply unit 308 includes a tape feeder that feeds a tape that holds the plurality of second electronic components 210 at a predetermined interval to a pickup position of the mounting head 311.
- the second electronic component 210 is not particularly limited, but is a chip component having a connection terminal as shown in FIG.
- the substrate holding unit 309 that holds and positions the substrate 101 may have any structure.
- the substrate holding unit 309 includes a substrate transfer conveyor 315 that transfers a carrier 314 holding the substrate 101.
- the substrate transport conveyor 315 functions as a substrate holding unit 309 in order to transport and position the substrate 101 to a position where each electronic component is mounted.
- the mounting head 311 includes a suction nozzle 311a that moves up and down by a built-in lifting mechanism, and the first electron is supplied from the first component supply unit 307 and the second component supply unit 308 by the lifting operation and suction of the suction nozzle 311a.
- the component 200 and the second electronic component 210 are picked up, and the electronic component is mounted on the substrate 101 at a predetermined position of the substrate 101 by a lifting operation and suction cancellation (vacuum break).
- a movable coating head 312 for supplying a thermosetting resin as the reinforcing resin 105 incorporates a dispenser having a coating nozzle 312a for discharging the reinforcing resin 105 and a lifting mechanism for moving the coating nozzle 312a up and down.
- the mounting head and the coating head may each be supported by a dedicated XY moving mechanism and move in a predetermined space including the upper part of the substrate.
- the mounting head and the coating head are integrated, and a predetermined XY moving mechanism is used. It is good also as a structure which moves space.
- the movement of the mounting head 311 and the operation of picking up and mounting electronic components by the mounting head 311 are controlled by commands from the control unit 313.
- operations such as movement of the coating head 312 and discharge of the reinforcing resin 105 from the coating nozzle 312 a are controlled by commands from the control unit 313.
- the control unit 313 includes a hard disk that stores programs for restricting movement and operation of the mounting head 311 and the coating head 312, a storage device 313 a such as a memory, a central processing unit 313 b such as a CPU or MPU, various interfaces, a personal computer, and the like. It is configured.
- the transfer unit 310 for supplying the flux coating film has a mechanism capable of supplying a flux coating film having a thickness suitable for transfer onto the bump 204 of the first electronic component 200 or the transfer surface of the transfer tool 220.
- a base table 320 provided below, a transfer table 321 provided on the upper surface of the base table 320, and a squeegee unit 323 arranged above the transfer table 321 are provided.
- the squeegee unit 323 includes a first squeegee member 323a and a second squeegee member 323b having a length substantially equal to the width of the transfer table 321 in the Y-axis direction, and these are parallel to the Y-axis direction with a predetermined interval therebetween. Is arranged.
- Each squeegee member can be moved up and down by an elevating mechanism built in the squeegee unit 323, that is, can advance and retreat with respect to the coating film formed on the transfer table 321.
- the squeegee unit 323 is moved in the direction of the arrow, and the first squeegee member 323a is moved at a predetermined timing. And the coating film of a flux is supplied by raising / lowering the 2nd squeegee member 323b.
- the mounting head 311 transfers the flux 206 from the coating film of the flux supplied by the transfer unit 310 to the plurality of bumps 204 of the first electronic component 200 according to the command of the control unit 313, and (ii) the flux 206 Each of the plurality of bumps 204 having transferred thereon is landed on the corresponding first electrode 102a, whereby the flux 206 is transferred to the first electrode 102a. (Iii) After the transfer of the flux 206 to the first electrode 102a, 1 The electronic component 200 is retracted from the substrate 101.
- the mounting head 311 moves the first electronic component 200 retracted so that the plurality of bumps 204 land on the corresponding first electrodes 102a.
- the second electronic component 210 is mounted on the substrate 101 such that (v) the connection terminal 211 is landed on the second electrode 102b via the paste 103 containing metal particles. To do.
- the coating head 312 supplies the thermosetting resin as the reinforcing resin 105 to the reinforcing position 104 during the predetermined time in accordance with a command from the control unit 313.
- coated is covered with a thermosetting resin.
- the amount of the reinforcing resin 105 applied to the reinforcing position 104 is in contact with the peripheral portion of the first electronic component when the retracted first electronic component 200 is mounted on the substrate 101 after the elapse of the predetermined time. Set to do.
- the control unit 313 When the control unit 313 recognizes that the substrate 101 is positioned on the substrate holding unit 309 (SP0), the control unit 313 starts the following movement and operation control of the mounting head 311. First, the mounting head 311 picks up the first electronic component 200 by the first component supply unit 307 (SP1), and moves the first electronic component 200 to the transfer unit 310 (SP2). Next, the mounting head 311 brings the bump 204 of the first electronic component 200 into contact with the flux coating film formed on the transfer table of the transfer unit 310, and transfers the flux to the bump 204 (SP3). Thereby, as shown in FIG. 6A, the flux 206 is applied to the bumps 204 of the first electronic component 200.
- the thickness of the coating film of the flux is appropriately adjusted in consideration of the size of the bump 204 and the coating amount per bump.
- the mounting head 311 moves the first electronic component 200 above the first electrode 102a of the substrate 101 (SP4), and causes the plurality of bumps 204 to land on the corresponding first electrode 102a, thereby flux. 206 is transferred to the first electrode 102a (SP5). Thereafter, the mounting head 311 retracts the first electronic component 200 from the substrate 101 (SP6).
- the position at which the first electronic component 200 is retracted is not particularly limited, but may be retracted to a position that does not become an obstacle when the coating head 312 next operates on the substrate 101.
- the control unit 313 controls the movement and operation of the coating head 312 as described below.
- the coating head 312 moves above the substrate 101 and aligns with a preset reinforcing position 104 (SP7).
- the coating head 312 supplies the reinforcing resin 105 to the reinforcing position 104 of the substrate 101 through the coating nozzle 312a (SP8). At that time, at least a part of the first electrode 102 a adjacent to the reinforcing position 104 is covered with the reinforcing resin 105.
- the coating head 312 has a small-diameter coating nozzle 312a as shown in FIG.
- the reinforcing resin 105 is supplied from the coating nozzle 312a to the reinforcing position 104 in a linear or dotted manner by a dispensing method.
- the reinforcing resin is applied to the peripheral portion 201x of the first electronic component 200.
- 105 can be brought into sufficient contact. It should be noted that by adjusting the amount of the reinforcing resin 105 so as not to be too large, productivity can be improved and repair can be facilitated. Further, defects such as protrusion of the reinforcing resin 105 are suppressed.
- the mounting head 311 moves the first electronic component 200 again above the first electrode 102a of the substrate 101 so that the plurality of bumps 204 land on the corresponding first electrode 102a. Then, the first electronic component 200 is mounted on the substrate 101 (SP9).
- the mounting of the first electronic component 200 on the substrate 101 is performed after a predetermined time has elapsed after the first electronic component 200 is temporarily retracted from the substrate 101.
- Such time is the time from when the first electronic component 200 is retracted from the substrate 101 to when the coating head 312 completes the operation of supplying the reinforcing resin 105 to the reinforcing position 104 set on the substrate 101. Same or longer than.
- the mounting head 311 picks up the second electronic component 210 by the second component supply unit 308 under the control of the control unit 313 (SP10),
- the second electronic component 210 is moved onto the second electrode 102b of the substrate 101 (SP11), and the second electronic component 210 is mounted on the substrate 101 so that the connection terminal lands on the paste 103 on the second electrode 102b. (SP12).
- the substrate on which the first electronic component 200 and the second electronic component 210 are mounted is reflowed (SP13), and the substrate is recovered.
- the order of mounting the first electronic component and the second electronic component is not limited to the above order.
- the first electronic component 200 may be mounted on the substrate after the second electronic component 210 is first mounted on the substrate. That is, SP10 to SP12 may be performed first, followed by SP1 to SP9. If the mounting head 311 has a plurality of suction nozzles, the first electronic component 200 and the second electronic component 210 may be picked up continuously or simultaneously.
- an image recognition system is used.
- precise alignment may be performed.
- an image recognition system may be used for precise alignment of the application head 312.
- the control unit 313 recognizes that the substrate 101 is positioned on the substrate holding unit 309 (SP0), the control unit 313 starts the following movement and operation control of the mounting head 311.
- the mounting head 311 moves to the installation location of the transfer tool 220, picks up the transfer tool 220 (SP1), and moves the transfer tool 220 to the transfer unit 310 (SP2).
- the transfer tool 220 has a rectangular bottom surface 221 having substantially the same area as the first electronic component 200, and a convex portion 222 is formed on the bottom surface 221 so as to correspond to the first electrode 102 a adjacent to the reinforcing position 104. ing.
- the transfer tool 220 may be built in the mounting head 311 together with a predetermined lifting mechanism. In that case, the operation of picking up the transfer tool from the installation place as described above can be omitted. In that case, the operation of transferring the flux 206 to the first electrode 102a by the transfer tool 220 is performed by a lifting operation by a built-in lifting mechanism.
- the mounting head 311 brings the tip of the convex portion 222 of the transfer tool 220, that is, the transfer surface 223 into contact with the coating film of the flux 206 formed on the transfer table 321, and transfers the flux 206 to the transfer surface 223. (SP3).
- the thickness of the coating film of the flux 206 is appropriately adjusted in consideration of the height of the convex portion 222 and the like.
- the mounting head 311 moves the transfer tool 220 having the transfer surface 223 coated with the flux 206 above the first electrode 102a of the substrate 101 (SP4), and landers the transfer surface 223 on the corresponding first electrode 102a. As a result, the flux 206 is transferred to the first electrode 102a (SP5). Thereafter, the mounting head 311 retracts the transfer tool 220 from the first electrode 102a (SP6).
- the position where the transfer tool 220 is retracted may be the same as when the first electronic component 200 is retracted.
- control unit 313 controls the coating head 312 in the same manner as SP7 to SP8 in the flowchart of FIG. 15 to apply the reinforcing resin 105 to the reinforcing position 104.
- the mounting head 311 picks up the first electronic component 200 by the first component supply unit 307 under the control of the control unit 313 (SP9), and is similar to SP2 to SP3 in the flowchart of FIG.
- the flux 206 is applied to the bump 204 (SP10).
- the mounting head 311 moves the first electronic component 200 above the first electrode 102a of the substrate 101 (SP11), so that the plurality of bumps 204 land on the corresponding first electrode 102a.
- the electronic component 200 is mounted on the substrate 101 (SP12).
- the second electronic component 210 is mounted, and the first electronic component 200 and the substrate on which the second electronic component 210 is mounted are reflowed. Is recovered.
- the order of mounting the first electronic component and the second electronic component is not limited to the above order.
- the second electronic component 210 may be mounted first, and then SP1 to SP12 may be performed.
- the configuration of the electronic component mounting apparatus 303 is not limited to the configuration shown in FIG.
- the second component supply unit 308 that supplies the second electronic component 210 is incorporated in the electronic component mounting apparatus 303 as necessary, but is not essential to the electronic component mounting apparatus of the present invention. That is, in the present invention, the movement and operation of the mounting head 311 regarding the second electronic component 210 may not be performed.
- control unit 313 includes at least one of the first component supply unit 307, the second component supply unit 308, the substrate holding unit 309, and the transfer unit 310 as well as the mounting head 311 and the coating head 312.
- the control unit 313 may form a coating film by the transfer unit 310 so that the coating film of the flux 206 is formed on the transfer table 321 before the first electronic component 200 or the transfer tool 220 arrives at the transfer unit 310.
- the timing may be controlled.
- FIG. 18A shows a plan view of the first electronic component 200 when the reinforcing resin 105 is applied to the four reinforcing positions corresponding to the four corners of the peripheral edge 201x of the rectangular first electronic component 200.
- FIG. FIG. 18B is a bottom view of the same first electronic component 200 (main surface 201s having a plurality of bumps).
- the reinforcing resin 105 is applied to the reinforcing position so as to cover only a part of the outermost first electrode 102a.
- the application pattern of the reinforcing resin 105 is not particularly limited.
- FIG. 19 illustrates five types of reinforcing resin coating patterns.
- the 4-point application pattern (a), 8-point application pattern (b), 12-point application pattern (c), and L-type application pattern (d) the four corners of the peripheral edge of the rectangular first electronic component or its A plurality of reinforcing positions are set in the vicinity.
- the reinforcing positions are set so as to include the four corners and the vicinity thereof.
- the order of the application patterns (a) to (e) the reinforcing effect increases, but the application time increases and the amount of reinforcing resin used also increases.
- repair (reworkability) is improved in the order of the coating patterns (e) to (a).
- the application pattern may be appropriately selected in consideration of the reinforcing effect according to the size of the first electronic component and the production tact.
- the flux may be any material that has an action of removing oxides or the like existing on the surface of the first electrode and the surface of the bump or reducing the surface tension of the solder during solder joining.
- active action By these actions (hereinafter referred to as “active action”), the wettability between the solder and the first electrode is increased, and good solder bonding with high reliability is possible.
- composition of the flux is not particularly limited, but includes, for example, a base agent such as rosin, an activator such as an organic acid or a hydrohalide, a solvent, a thixotropic agent, and the like.
- thermosetting flux on the assumption that the flux and the thermosetting resin as the reinforcing resin are in contact with each other.
- thermosetting flux can be obtained by including a thermosetting resin in the flux.
- a thermosetting resin for example, an epoxy resin is suitable from the viewpoint of excellent heat resistance.
- thermosetting resin is used as the reinforcing resin.
- the thermosetting resin include an epoxy resin, a phenol resin, a melamine resin, and a urethane resin.
- the thermosetting resin may contain a curing agent, a curing accelerator, and the like.
- the curing agent an acid anhydride, an aliphatic or aromatic amine, imidazole or a derivative thereof is preferably used, and examples of the curing accelerator include dicyandiamide.
- the reinforcing resin contains a component having an action of removing an oxide present on the surface of the first electrode or the bump.
- an activator included in the flux may be included in the reinforcing resin.
- the reinforcing resin has a composition that cures after the first electrode is sufficiently wetted by the melted bump during reflow.
- the viscosity of the reinforcing resin before thermosetting tends to decrease with increasing temperature. Therefore, by delaying the curing reaction of the reinforcing resin with respect to the melting of the bumps, it becomes easy to obtain the self-alignment effect by the melted bumps. For example, by making the curing temperature of the reinforcing resin higher than the bump melting temperature (melting point), the effect of self-alignment can be obtained with certainty.
- the curing temperature of the reinforcing resin is determined as the peak temperature of a curve indicating the relationship between the temperature obtained by differential scanning calorimetry (DSC) and the heat flow.
- the present invention is not limited to the case where one type of first electronic component is mounted on a substrate, but can also be applied to the case where a plurality of types of first electronic components are mounted on a substrate.
- the electronic component mounting apparatus is provided with a nozzle stocker that holds a plurality of suction nozzles for mounting on the mounting head, and the suction nozzles can be exchanged corresponding to the plurality of first electronic components, respectively. You may do it.
- the present invention is not limited to the case where one type of second electronic component is mounted on the substrate, but can naturally be applied to the case where a plurality of types of second electronic components are mounted on the substrate.
- the electronic component mounting method, the electronic component mounting apparatus, and the electronic component mounting system of the present invention even when the electrode provided on the substrate is covered with the reinforcing resin, the electrode is sufficiently wetted by the melted bump during reflow. Therefore, the strength of the solder joint portion is ensured. Therefore, it is useful in the field of surface mounting such as BGA type electronic components. While this invention has been described in terms of the presently preferred embodiments, such disclosure should not be construed as limiting. Various changes and modifications will no doubt become apparent to those skilled in the art to which the present invention pertains after reading the above disclosure. Accordingly, the appended claims should be construed to include all variations and modifications without departing from the true spirit and scope of this invention.
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Abstract
Description
前記第1電子部品を準備する工程と、
前記基板を準備する工程と、
前記複数のバンプにフラックスを塗布する工程と、
前記搭載領域の周縁部に設定された少なくとも1つの補強位置に隣接する前記第1電極に、フラックスを塗布する工程と、
前記補強位置に熱硬化性樹脂を塗布するとともに、前記補強位置に隣接する前記フラックスが塗布された第1電極の少なくとも一部を前記熱硬化性樹脂で覆う工程と、
前記フラックスが塗布された複数のバンプが、それぞれ対応する前記第1電極に着地するように、前記第1電子部品を前記基板に搭載するとともに、前記補強位置に塗布された前記熱硬化性樹脂を前記第1電子部品の周縁部に接触させる工程と、
前記第1電子部品を搭載した前記基板を加熱して、前記バンプを溶融させるとともに、前記熱硬化性樹脂を硬化させ、放冷することにより、前記第1電子部品を前記基板に接合する工程と、を含む電子部品実装方法に関する。
前記第1電子部品を供給する第1部品供給部と、
前記基板を保持して位置決めする基板保持部と、
フラックスの塗膜を供給する転写ユニットと、
前記供給された第1電子部品を前記基板に搭載する移動可能な搭載ヘッドと、
前記基板の前記搭載領域の周縁部に設定された少なくとも1つの補強位置に、熱硬化性樹脂を塗布する移動可能な塗布ヘッドと、
前記搭載ヘッドと前記塗布ヘッドの移動および動作を制御する制御部と、
を具備し、
前記制御部の指令により、
前記搭載ヘッドは、
(i)前記転写ユニットで供給される前記フラックスの塗膜から、前記第1電子部品の前記複数のバンプに前記フラックスを転写し、
(ii)前記フラックスが転写された複数のバンプを、それぞれ対応する前記第1電極に着地させることにより、前記フラックスを前記第1電極に転写し、
(iii)前記フラックスの前記第1電極への転写後、前記第1電子部品を前記基板から退避させ、
前記第1電子部品の前記基板からの退避後、
前記塗布ヘッドは、
(iv)前記補強位置に前記熱硬化性樹脂を塗布するとともに、前記補強位置に隣接する前記フラックスが塗布された第1電極の少なくとも一部を前記熱硬化性樹脂で覆い、
前記補強位置への前記熱硬化性樹脂の塗布後、
前記搭載ヘッドは、
(v)前記複数のバンプがそれぞれ対応する前記第1電極に着地するように、前記退避させた第1電子部品を前記基板に搭載するとともに、前記補強位置に塗布された前記熱硬化性樹脂を前記第1電子部品の周縁部に接触させる、電子部品搭載装置に関する。
前記第1電子部品を供給する第1部品供給部と、
前記基板を保持して位置決めする基板保持部と、
フラックスの塗膜を供給する転写ユニットと、
前記供給された第1電子部品を前記基板に搭載する移動可能な搭載ヘッドと、
前記基板の前記搭載領域の周縁部に設定された少なくとも1つの補強位置に、熱硬化性樹脂を塗布する移動可能な塗布ヘッドと、
前記補強位置に隣接する前記第1電極に対応する転写面を有する転写ツールと、
前記搭載ヘッドと前記塗布ヘッドの移動および動作を制御する制御部と、
を具備し、
前記制御部の指令により、
前記搭載ヘッドは、
(i)前記転写ユニットで供給される前記フラックスの塗膜から、前記転写ツールの前記転写面に前記フラックスを転写し、
(ii)前記転写ツールの前記フラックスが転写された転写面を、前記対応する第1電極に着地させることにより、前記フラックスを前記第1電極に転写し、
(iii)前記フラックスの前記第1電極への転写後、前記転写ツールを前記基板から退避させ、
前記転写ツールの前記基板からの退避後、
前記塗布ヘッドは、
(iv)前記補強位置に前記熱硬化性樹脂を塗布するとともに、前記補強位置に隣接する前記フラックスが塗布された第1電極の少なくとも一部を前記熱硬化性樹脂で覆い、
前記補強位置への前記熱硬化性樹脂の塗布後、
前記搭載ヘッドは、
(v)前記転写ユニットで供給される前記フラックスの塗膜から、前記第1電子部品の前記複数のバンプに前記フラックスを転写し、
(vi)前記フラックスが転写された複数のバンプがそれぞれ対応する前記第1電極に着地するように、前記第1電子部品を前記基板に搭載するとともに、前記補強位置に塗布された前記熱硬化性樹脂を前記第1電子部品の周縁部に接触させる、電子部品搭載装置に関する。
前記基板を供給する基板供給装置と、
前記基板供給装置から搬出された前記基板の前記第2電極にスクリーン印刷により金属粒子を含むペーストを塗布するスクリーン印刷装置と、
前記スクリーン印刷装置から搬出された前記基板の前記第1搭載領域に前記第1電子部品を搭載するとともに、前記第2搭載領域に前記第2電子部品を搭載する電子部品搭載装置と、
前記電子部品搭載装置から搬出された前記基板を加熱して、前記バンプおよび金属粒子を溶融させるとともに、前記熱硬化性樹脂を硬化させるリフロー装置と、を具備し、
前記電子部品搭載装置が、
前記第1電子部品を供給する第1部品供給部と、
前記第2電子部品を供給する第2部品供給部と、
前記基板を保持して位置決めする基板保持部と、
フラックスの塗膜を供給する転写ユニットと、
前記供給された第1電子部品および第2電子部品を前記基板に搭載する移動可能な搭載ヘッドと、
前記基板の前記第1搭載領域の周縁部に設定された少なくとも1つの補強位置に、熱硬化性樹脂を塗布する移動可能な塗布ヘッドと、
前記搭載ヘッドと前記塗布ヘッドの移動および動作を制御する制御部と、
を具備し、
前記制御部の指令により、
前記搭載ヘッドは、
前記接続用端子が前記金属粒子を含むペーストを介して前記第2電極に着地するように、前記第2電子部品を前記基板に搭載し、かつ
前記搭載ヘッドは、
(i)前記転写ユニットで供給される前記フラックスの塗膜から、前記第1電子部品の前記複数のバンプに前記フラックスを転写し、
(ii)前記フラックスが転写された複数のバンプを、それぞれ対応する前記第1電極に着地させることにより、前記フラックスを前記第1電極に転写し、
(iii)前記フラックスの前記第1電極への転写後、前記第1電子部品を前記基板から退避させ、
前記第1電子部品の前記基板からの退避後、
前記塗布ヘッドは、
(iv)前記補強位置に前記熱硬化性樹脂を塗布するとともに、前記補強位置に隣接する前記フラックスが塗布された第1電極の少なくとも一部を前記熱硬化性樹脂で覆い、
前記補強位置への前記熱硬化性樹脂の塗布後、
前記搭載ヘッドは、
(v)前記複数のバンプがそれぞれ対応する前記第1電極に着地するように、前記退避させた第1電子部品を前記基板に搭載するとともに、前記補強位置に塗布された前記熱硬化性樹脂を前記第1電子部品の周縁部に接触させる、電子部品実装システムに関する。
前記基板を供給する基板供給装置と、
前記基板供給装置から搬出された前記基板の前記第2電極にスクリーン印刷により金属粒子を含むペーストを塗布するスクリーン印刷装置と、
前記スクリーン印刷装置から搬出された前記基板の前記第1搭載領域に前記第1電子部品を搭載するとともに、前記第2搭載領域に第2電子部品を搭載する電子部品搭載装置と、
前記電子部品搭載装置から搬出された前記基板を加熱して、前記バンプおよび金属粒子を溶融させるとともに、前記熱硬化性樹脂を硬化させるリフロー装置と、を具備し、
前記電子部品搭載装置が、
前記第1電子部品を供給する第1部品供給部と、
前記第2電子部品を供給する第2部品供給部と、
前記基板を保持して位置決めする基板保持部と、
フラックスの塗膜を供給する転写ユニットと、
前記供給された第1電子部品および第2電子部品を前記基板に搭載する移動可能な搭載ヘッドと、
前記基板の前記第1搭載領域の周縁部に設定された少なくとも1つの補強位置に、熱硬化性樹脂を塗布する移動可能な塗布ヘッドと、
前記補強位置に隣接する前記第1電極に対応する転写面を有する転写ツールと、
前記搭載ヘッドと前記塗布ヘッドの移動および動作を制御する制御部と、
を具備し、
前記制御部の指令により、
前記搭載ヘッドは、
前記接続用端子が前記金属粒子を含むペーストを介して前記第2電極に着地するように、前記第2電子部品を前記基板に搭載し、かつ
前記搭載ヘッドは、
(i)前記転写ユニットで供給される前記フラックスの塗膜から、前記転写ツールの前記転写面に前記フラックスを転写し、
(ii)前記転写ツールの前記フラックスが転写された転写面を、前記対応する第1電極に着地させることにより、前記フラックスを前記第1電極に転写し、
(iii)前記フラックスの前記第1電極への転写後、前記転写ツールを前記基板から退避させ、
前記転写ツールの前記基板からの退避後、
前記塗布ヘッドは、
(iv)前記補強位置に前記熱硬化性樹脂を塗布するとともに、前記補強位置に隣接する前記フラックスが塗布された第1電極の少なくとも一部を前記熱硬化性樹脂で覆い、
前記補強位置への前記熱硬化性樹脂の塗布後、
前記搭載ヘッドは、
(v)前記転写ユニットで供給される前記フラックスの塗膜から、前記第1電子部品の前記複数のバンプに前記フラックスを転写し、
(vi)前記フラックスが転写された複数のバンプがそれぞれ対応する前記第1電極に着地するように、前記第1電子部品を前記基板に搭載するとともに、前記補強位置に塗布された前記熱硬化性樹脂を前記第1電子部品の周縁部に接触させる、電子部品実装システムに関する。
本発明の新規な特徴を添付の請求の範囲に記述するが、本発明は、構成および内容の両方に関し、本願の他の目的および特徴と併せ、図面を照合した以下の詳細な説明によりさらによく理解されるであろう。
ここでは、複数のバンプで基板の電極(ランド)に接続されるボールグリッドアレイ(BGA)型の電子部品(第1電子部品)の他に、クリームはんだなどの金属粒子を含むペーストにより基板の電極に接続される電子部品(第2電子部品)を含む一般的な実装構造体に基づいて説明する。
図3Aは、第1電子部品200の一例の縦断面図であり、図3Bはその底面図である。
第1電子部品200は、薄い基板(部品内基板)201と、その上面に実装された半導体素子202と、半導体素子202を被覆する封止樹脂203とを具備するパッケージである。部品内基板201の下面は、第1電子部品の主面201sを構成しており、主面201sには複数の端子が規則的に行列状に配列され、各々の端子にはバンプ204が設けられている。なお、第1電子部品の構造は、図3Aおよび図3Bに示す構造に限定されない。例えば、様々な形態のフリップチップやチップサイズパッケージ(CSP)などの部品が第1電子部品に含まれる。
なお、転写ツールは、補強位置104に隣接する第1電極102aに対応する転写面を有すればよいが、その他の第1電極102aに対応する転写面を有していてもよい。すなわち、補強位置104に隣接する第1電極102aまたはこれを含む一部の第1電極102aに選択的にフラックスを塗布できる転写ツールを用いてもよく、第1電極102aの全てにフラックス206を塗布できる転写ツールを用いてもよい。
電子部品実装システム300は、電子部品を実装するための基板を供給する基板供給装置301と、基板供給装置301から搬出された基板の所定の電極(第2電極102b)に、スクリーン印刷により金属粒子を含むペーストを塗布するスクリーン印刷装置302と、スクリーン印刷装置302から搬出された基板の、前記所定の電極とは異なる電極(第1電極102a)に、第1電子部品を搭載するとともに、金属粒子を含むペーストが塗布された電極に第2電子部品を搭載する電子部品搭載装置303と、電子部品搭載装置303から搬出された基板を加熱して、第1電子部品および第2電子部品を基板に接合するリフロー装置304と、を具備する。リフロー装置304から搬出された基板、すなわち実装構造体は、基板回収装置305により回収される。
制御部313は、基板101が基板保持部309に位置決めされたことを認識すると(SP0)、以下のような搭載ヘッド311の移動および動作の制御を開始する。まず、搭載ヘッド311は、第1部品供給部307で第1電子部品200をピックアップし(SP1)、第1電子部品200を転写ユニット310に移動させる(SP2)。次に、搭載ヘッド311は、転写ユニット310の転写テーブルに形成されたフラックスの塗膜に第1電子部品200のバンプ204を接触させ、バンプ204にフラックスを転写する(SP3)。これにより、図6(a)に示すように、フラックス206が第1電子部品200のバンプ204に塗布される。フラックスの塗膜の厚さは、バンプ204の大きさや、バンプ1個あたりの塗布量を考慮して適宜調整される。なお、バンプ204にフラックス206を転写するとき、フラックスの塗膜の所定の位置に第1電子部品200が着地するように、位置合わせの制御を行うことが好ましい。
制御部313は、基板101が基板保持部309に位置決めされたことを認識すると(SP0)、以下のような搭載ヘッド311の移動および動作の制御を開始する。まず、搭載ヘッド311は、転写ツール220の設置場所に移動し、転写ツール220をピックアップし(SP1)、転写ツール220を転写ユニット310に移動させる(SP2)。転写ツール220は、第1電子部品200とほぼ同じ面積を有する矩形の底面221を有し、底面221には、補強位置104に隣接する第1電極102aに対応するように凸部222が形成されている。なお、転写ツール220は、所定の昇降機構とともに搭載ヘッド311に内蔵させてもよい。その場合、上記のような、設置場所から転写ツールをピックアップする動作は、省略することができる。その場合、転写ツール220によりフラックス206を第1電極102aに転写する動作は、内蔵されている昇降機構による昇降動作によって行われる。
図18Aは、矩形の第1電子部品200の周縁部201xの四隅に対応させて4箇所の補強位置に補強用樹脂105を塗布したときの、第1電子部品200の平面図を示す。図18Bは、同じ第1電子部品200の底面図(複数のバンプを有する主面201s)である。補強用樹脂105は、図示しないが、最外周の第1電極102aの一部だけを覆うように補強位置に塗布されている。ただし、補強用樹脂105の塗布パターンは、特に限定されない。
フラックスは、はんだ接合の際に、第1電極の表面およびバンプの表面に存在する酸化物などを除去したり、はんだの表面張力を低減したりする作用を有する材料であればよい。これらの作用(以下、活性作用)により、はんだと第1電極との濡れ性が大きくなり、信頼性の高い良好なはんだ接合が可能となる。
補強用樹脂には、熱硬化性樹脂が用いられる。熱硬化性樹脂としては、エポキシ樹脂、フェノール樹脂、メラミン樹脂、ウレタン樹脂などを例示できる。熱硬化性樹脂は、硬化剤、硬化促進剤などを含んでもよい。硬化剤としては、酸無水物、脂肪族または芳香族アミン、イミダゾールまたはその誘導体などが好ましく用いられ、硬化促進剤としては、ジシアンジアミドなどを例示できる。
本発明を現時点での好ましい実施態様に関して説明したが、そのような開示を限定的に解釈してはならない。種々の変形および改変は、上記開示を読むことによって本発明に属する技術分野における当業者には間違いなく明らかになるであろう。したがって、添付の請求の範囲は、本発明の真の精神および範囲から逸脱することなく、すべての変形および改変を包含する、と解釈されるべきものである。
Claims (13)
- 複数のバンプが設けられた主面を有する第1電子部品を、前記複数のバンプに対応する複数の第1電極が設けられた搭載領域を有する基板に実装する、電子部品実装方法であって、
前記第1電子部品を準備する工程と、
前記基板を準備する工程と、
前記複数のバンプにフラックスを塗布する工程と、
前記搭載領域の周縁部に設定された少なくとも1つの補強位置に隣接する前記第1電極に、フラックスを塗布する工程と、
前記補強位置に熱硬化性樹脂を塗布するとともに、前記補強位置に隣接する前記フラックスが塗布された第1電極の少なくとも一部を前記熱硬化性樹脂で覆う工程と、
前記フラックスが塗布された複数のバンプが、それぞれ対応する前記第1電極に着地するように、前記第1電子部品を前記基板に搭載するとともに、前記補強位置に塗布された前記熱硬化性樹脂を前記第1電子部品の周縁部に接触させる工程と、
前記第1電子部品を搭載した前記基板を加熱して、前記バンプを溶融させるとともに、前記熱硬化性樹脂を硬化させ、放冷することにより、前記第1電子部品を前記基板に接合する工程と、を含む電子部品実装方法。 - 前記第1電極に前記フラックスを塗布する工程が、
(a)前記フラックスが塗布された複数のバンプを、それぞれ対応する前記第1電極に着地させることにより、前記フラックスを前記第1電極に転写する工程と、
(b)前記フラックスの前記第1電極への転写後、前記第1電子部品を前記基板から退避させる工程と、を含み、
前記第1電子部品を前記基板に搭載する工程が、
前記退避させた第1電子部品を前記基板に搭載する工程である、請求項1記載の電子部品実装方法。 - 前記第1電極に前記フラックスを塗布する工程が、
(a)前記補強位置に隣接する第1電極に対応する転写面を有する転写ツールの前記転写面に前記フラックスを塗布する工程と、
(b)前記フラックスが塗布された転写面を、前記対応する第1電極に着地させることにより、前記フラックスを前記第1電極に転写する工程と、
(c)前記フラックスの前記第1電極への転写後、前記転写ツールを前記基板から退避させる工程と、を含む、請求項1記載の電子部品実装方法。 - 前記補強位置に前記熱硬化性樹脂を塗布する際に、前記補強位置の近傍の前記第1電極だけを前記熱硬化性樹脂で覆う、請求項1~3のいずれか1項に記載の電子部品実装方法。
- 前記熱硬化性樹脂が、前記第1電極または前記バンプの表面に存在する酸化物を除去する作用を有する成分を含む、請求項1~4のいずれか1項に記載の電子部品実装方法。
- 前記フラックスが、熱硬化性フラックスである、請求項1~5のいずれか1項に記載の電子部品実装方法。
- 前記第1電子部品の前記主面の形状が矩形であり、少なくとも前記第1電子部品の四隅またはその近傍に対応する複数の前記補強位置に、前記熱硬化性樹脂をそれぞれ塗布する、請求項1~6のいずれか1項に記載の電子部品実装方法。
- さらに、接続用端子を有する第2電子部品を準備する工程と、
前記第1電極に前記フラックスを塗布する前に、前記基板に設けられた前記接続用端子に対応する第2電極に、スクリーン印刷により、金属粒子を含むペーストを塗布する工程と、
前記接続用端子が、前記金属粒子を含むペーストを介して、前記第2電極に着地するように、前記第2電子部品を前記基板に搭載する工程と、を含む、請求項1~7のいずれか1項に記載の電子部品実装方法。 - 複数のバンプが設けられた主面を有する第1電子部品を、前記複数のバンプに対応する複数の第1電極が設けられた搭載領域を有する基板に搭載する、電子部品搭載装置であって、
前記第1電子部品を供給する第1部品供給部と、
前記基板を保持して位置決めする基板保持部と、
フラックスの塗膜を供給する転写ユニットと、
前記供給された第1電子部品を前記基板に搭載する移動可能な搭載ヘッドと、
前記基板の前記搭載領域の周縁部に設定された少なくとも1つの補強位置に、熱硬化性樹脂を塗布する移動可能な塗布ヘッドと、
前記搭載ヘッドと前記塗布ヘッドの移動および動作を制御する制御部と、
を具備し、
前記制御部の指令により、
前記搭載ヘッドは、
(i)前記転写ユニットで供給される前記フラックスの塗膜から、前記第1電子部品の前記複数のバンプに前記フラックスを転写し、
(ii)前記フラックスが転写された複数のバンプを、それぞれ対応する前記第1電極に着地させることにより、前記フラックスを前記第1電極に転写し、
(iii)前記フラックスの前記第1電極への転写後、前記第1電子部品を前記基板から退避させ、
前記第1電子部品の前記基板からの退避後、
前記塗布ヘッドは、
(iv)前記補強位置に前記熱硬化性樹脂を塗布するとともに、前記補強位置に隣接する前記フラックスが塗布された第1電極の少なくとも一部を前記熱硬化性樹脂で覆い、
前記補強位置への前記熱硬化性樹脂の塗布後、
前記搭載ヘッドは、
(v)前記複数のバンプがそれぞれ対応する前記第1電極に着地するように、前記退避させた第1電子部品を前記基板に搭載するとともに、前記補強位置に塗布された前記熱硬化性樹脂を前記第1電子部品の周縁部に接触させる、電子部品搭載装置。 - 複数のバンプが設けられた主面を有する第1電子部品を、前記複数のバンプに対応する複数の第1電極が設けられた搭載領域を有する基板に搭載する、電子部品搭載装置であって、
前記第1電子部品を供給する第1部品供給部と、
前記基板を保持して位置決めする基板保持部と、
フラックスの塗膜を供給する転写ユニットと、
前記供給された第1電子部品を前記基板に搭載する移動可能な搭載ヘッドと、
前記基板の前記搭載領域の周縁部に設定された少なくとも1つの補強位置に、熱硬化性樹脂を塗布する移動可能な塗布ヘッドと、
前記補強位置に隣接する前記第1電極に対応する転写面を有する転写ツールと、
前記搭載ヘッドと前記塗布ヘッドの移動および動作を制御する制御部と、
を具備し、
前記制御部の指令により、
前記搭載ヘッドは、
(i)前記転写ユニットで供給される前記フラックスの塗膜から、前記転写ツールの前記転写面に前記フラックスを転写し、
(ii)前記転写ツールの前記フラックスが転写された転写面を、前記対応する第1電極に着地させることにより、前記フラックスを前記第1電極に転写し、
(iii)前記フラックスの前記第1電極への転写後、前記転写ツールを前記基板から退避させ、
前記転写ツールの前記基板からの退避後、
前記塗布ヘッドは、
(iv)前記補強位置に前記熱硬化性樹脂を塗布するとともに、前記補強位置に隣接する前記フラックスが塗布された第1電極の少なくとも一部を前記熱硬化性樹脂で覆い、
前記補強位置への前記熱硬化性樹脂の塗布後、
前記搭載ヘッドは、
(v)前記転写ユニットで供給される前記フラックスの塗膜から、前記第1電子部品の前記複数のバンプに前記フラックスを転写し、
(vi)前記フラックスが転写された複数のバンプがそれぞれ対応する前記第1電極に着地するように、前記第1電子部品を前記基板に搭載するとともに、前記補強位置に塗布された前記熱硬化性樹脂を前記第1電子部品の周縁部に接触させる、電子部品搭載装置。 - さらに、接続用端子を有する第2電子部品を供給する第2部品供給部を具備し、
前記搭載ヘッドは、前記制御部の指令により、前記接続用端子が前記基板に設けられた前記接続用端子に対応する第2電極に着地するように、前記第2電子部品を前記基板に搭載する、請求項9または10記載の電子部品搭載装置。 - 複数のバンプが設けられた主面を有する第1電子部品および接続用端子を有する第2電子部品を、前記複数のバンプに対応する複数の第1電極が設けられた第1搭載領域および前記接続用端子に対応する第2電極が設けられた第2搭載領域を有する基板に実装する電子部品実装システムであって、
前記基板を供給する基板供給装置と、
前記基板供給装置から搬出された前記基板の前記第2電極にスクリーン印刷により金属粒子を含むペーストを塗布するスクリーン印刷装置と、
前記スクリーン印刷装置から搬出された前記基板の前記第1搭載領域に前記第1電子部品を搭載するとともに、前記第2搭載領域に第2電子部品を搭載する電子部品搭載装置と、
前記電子部品搭載装置から搬出された前記基板を加熱して、前記バンプおよび金属粒子を溶融させるとともに、前記熱硬化性樹脂を硬化させるリフロー装置と、を具備し、
前記電子部品搭載装置が、
前記第1電子部品を供給する第1部品供給部と、
前記第2電子部品を供給する第2部品供給部と、
前記基板を保持して位置決めする基板保持部と、
フラックスの塗膜を供給する転写ユニットと、
前記供給された第1電子部品および第2電子部品を前記基板に搭載する移動可能な搭載ヘッドと、
前記基板の前記第1搭載領域の周縁部に設定された少なくとも1つの補強位置に、熱硬化性樹脂を塗布する移動可能な塗布ヘッドと、
前記搭載ヘッドと前記塗布ヘッドの移動および動作を制御する制御部と、
を具備し、
前記制御部の指令により、
前記搭載ヘッドは、
前記接続用端子が前記金属粒子を含むペーストを介して前記第2電極に着地するように、前記第2電子部品を前記基板に搭載し、かつ、
前記搭載ヘッドは、
(i)前記転写ユニットで供給される前記フラックスの塗膜から、前記第1電子部品の前記複数のバンプに前記フラックスを転写し、
(ii)前記フラックスが転写された複数のバンプを、それぞれ対応する前記第1電極に着地させることにより、前記フラックスを前記第1電極に転写し、
(iii)前記フラックスの前記第1電極への転写後、前記第1電子部品を前記基板から退避させ、
前記第1電子部品の前記基板からの退避後、
前記塗布ヘッドは、
(iv)前記補強位置に前記熱硬化性樹脂を塗布するとともに、前記補強位置に隣接する前記フラックスが塗布された第1電極の少なくとも一部を前記熱硬化性樹脂で覆い、
前記補強位置への前記熱硬化性樹脂の塗布後、
前記搭載ヘッドは、
(v)前記複数のバンプがそれぞれ対応する前記第1電極に着地するように、前記退避させた第1電子部品を前記基板に搭載するとともに、前記補強位置に塗布された前記熱硬化性樹脂を前記第1電子部品の周縁部に接触させる、電子部品実装システム。 - 複数のバンプが設けられた主面を有する第1電子部品および接続用端子を有する第2電子部品を、前記複数のバンプに対応する複数の第1電極が設けられた第1搭載領域および前記接続用端子に対応する第2電極が設けられた第2搭載領域を有する基板に実装する電子部品実装システムであって、
前記基板を供給する基板供給装置と、
前記基板供給装置から搬出された前記基板の前記第2電極にスクリーン印刷により金属粒子を含むペーストを塗布するスクリーン印刷装置と、
前記スクリーン印刷装置から搬出された前記基板の前記第1搭載領域に前記第1電子部品を搭載するとともに、前記第2搭載領域に第2電子部品を搭載する電子部品搭載装置と、
前記電子部品搭載装置から搬出された前記基板を加熱して、前記バンプおよび金属粒子を溶融させるとともに、前記熱硬化性樹脂を硬化させるリフロー装置と、を具備し、
前記電子部品搭載装置が、
前記第1電子部品を供給する第1部品供給部と、
前記第2電子部品を供給する第2部品供給部と、
前記基板を保持して位置決めする基板保持部と、
フラックスの塗膜を供給する転写ユニットと、
前記供給された第1電子部品および第2電子部品を前記基板に搭載する移動可能な搭載ヘッドと、
前記基板の前記第1搭載領域の周縁部に設定された少なくとも1つの補強位置に、熱硬化性樹脂を塗布する移動可能な塗布ヘッドと、
前記補強位置に隣接する前記第1電極に対応する転写面を有する転写ツールと、
前記搭載ヘッドと前記塗布ヘッドの移動および動作を制御する制御部と、
を具備し、
前記制御部の指令により、
前記搭載ヘッドは、
前記接続用端子が前記金属粒子を含むペーストを介して前記第2電極に着地するように、前記第2電子部品を前記基板に搭載し、かつ、
前記搭載ヘッドは、
(i)前記転写ユニットで供給される前記フラックスの塗膜から、前記転写ツールの前記転写面に前記フラックスを転写し、
(ii)前記転写ツールの前記フラックスが転写された転写面を、前記対応する第1電極に着地させることにより、前記フラックスを前記第1電極に転写し、
(iii)前記フラックスの前記第1電極への転写後、前記転写ツールを前記基板から退避させ、
前記転写ツールの前記基板からの退避後、
前記塗布ヘッドは、
(iv)前記補強位置に前記熱硬化性樹脂を塗布するとともに、前記補強位置に隣接する前記フラックスが塗布された第1電極の少なくとも一部を前記熱硬化性樹脂で覆い、
前記補強位置への前記熱硬化性樹脂の塗布後、
前記搭載ヘッドは、
(v)前記転写ユニットで供給される前記フラックスの塗膜から、前記第1電子部品の前記複数のバンプに前記フラックスを転写し、
(vi)前記フラックスが転写された複数のバンプがそれぞれ対応する前記第1電極に着地するように、前記第1電子部品を前記基板に搭載するとともに、前記補強位置に塗布された前記熱硬化性樹脂を前記第1電子部品の周縁部に接触させる、電子部品実装システム。
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KR102358285B1 (ko) * | 2018-11-30 | 2022-02-04 | 타이완 세미콘덕터 매뉴팩쳐링 컴퍼니 리미티드 | 반도체 패키지 디바이스 및 그 제조 방법 |
WO2024203424A1 (ja) * | 2023-03-29 | 2024-10-03 | 東レエンジニアリング株式会社 | フラックス転写装置およびこれを備えた実装装置 |
Also Published As
Publication number | Publication date |
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US20140096379A1 (en) | 2014-04-10 |
JP6260814B2 (ja) | 2018-01-17 |
JPWO2012164957A1 (ja) | 2015-02-23 |
CN103548430A (zh) | 2014-01-29 |
CN103548430B (zh) | 2016-12-28 |
US9609760B2 (en) | 2017-03-28 |
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