JP6010760B2 - Electronic component mounting system and electronic component mounting method - Google Patents

Description

  The present invention relates to an electronic component mounting system and an electronic component mounting method for mounting electronic components on a substrate.

  An electronic component mounting system that manufactures a mounting substrate by mounting electronic components on a substrate by solder bonding is configured by connecting a plurality of electronic component mounting devices such as a solder printing device, an electronic component mounting device, and a reflow device. In such an electronic component mounting system, the solder printing position is actually measured and acquired for the purpose of preventing mounting defects caused by the solder printing position shift with respect to the electrodes formed for solder bonding on the board. A position correction technique for feeding forward the solder position information to a subsequent process is known (for example, see Patent Document 1).

  In the example shown in Patent Document 1, a print inspection apparatus is arranged between a printing apparatus and an electronic component mounting apparatus to detect a printing position deviation, and the influence of the printing position deviation is minimized with respect to an electronic component mounting apparatus in a subsequent process. The correction information of the mounting position for limiting is transmitted. This makes it possible to mitigate the effects of printing misalignment using the so-called self-alignment effect, in which electronic components are attracted to the electrodes by the surface tension of the molten solder during the reflow process after mounting the components. The mounting quality can be ensured.

JP 2003-229699 A

  By the way, the above-mentioned self-alignment effect does not act uniformly on any kind of electronic component, and the degree of operation varies depending on the electrode shape, the size / mass of the component, the degree of printing position deviation, and the like. For example, if the mass component is large or the amount of displacement is excessive, the self-alignment effect will not function sufficiently even if the electronic component is mounted in accordance with the solder position. It cannot be moved to the mounting position. Further, when the planar shape and arrangement of the electronic component are asymmetric, an asymmetric suction force that rotates the electronic component when the solder is melted acts and it is difficult to obtain the desired alignment effect.

  However, in the prior art including the above-mentioned patent document examples, when applying the mounting position correction based on the solder printing position, it is applied uniformly according to the positional deviation amount regardless of the degree and manner of the printing positional deviation amount. Was done. For this reason, depending on the degree of printing position deviation, application of position correction sometimes causes a bonding failure in the solder bonding process. As described above, in the conventional electronic component mounting, there is a problem that the application method of the mounting position correction based on the solder printing position is not necessarily appropriate, and the intended effect of improving the bonding quality may not be obtained. It was.

  Accordingly, an object of the present invention is to provide an electronic component mounting system and an electronic component mounting method capable of appropriately applying mounting position correction based on a solder printing position and obtaining a desired effect of improving bonding quality. .

An electronic component mounting system according to the present invention is an electronic component mounting system that is configured by connecting a plurality of electronic component mounting apparatuses, and mounting the electronic component on a substrate to manufacture a mounting substrate. The electronic component mounting system is formed on the substrate. A printing apparatus that prints solder on an electrode for joining electronic components, a solder position detection unit that detects the position of the printed solder, and a displacement amount between the position of the electrode and the printed solder position An electronic component mounting apparatus that picks up an electronic component from a component supply unit by a mounting head by a mounting head, transfers the electronic component to a mounting position on the board on which the solder is printed, and executes a mounting operation by the electronic component mounting apparatus Mounting information including a limit value indicating an upper limit of a correction amount allowed in mounting position correction for correcting the mounting position based on the calculated positional deviation amount And a mounting information storage unit for storing, in the mounting information, follow-up ratio indicating a ratio of the correction amount for the calculated said position shift amount is included, the limit value and the follow-up rate is subject electronic Each component can be set for each component of the positional deviation amount in the X direction, Y direction, and θ direction, and the electronic component mounting apparatus places the electronic component at the mounting position corrected according to a preset follow-up ratio. When the correction amount based on the calculated positional deviation amount exceeds the limit value, an electronic component is mounted at the mounting position corrected using the limit value as the correction amount.

The electronic component mounting method of the present invention is an electronic component mounting method for manufacturing a mounting substrate by mounting an electronic component on a substrate by an electronic component mounting system configured by connecting a plurality of electronic component mounting apparatuses. A printing process for printing solder on an electrode for joining electronic components formed on the substrate, a solder position detection process for detecting the position of the printed solder, and the position of the electrode and the position of the printed solder A positional deviation amount calculating step for calculating a positional deviation amount, and an electronic component mounting step for picking up an electronic component from a component supply unit by a mounting head, and transporting and mounting the electronic component on a mounting position on the printed board. Calculated as a limit value indicating the upper limit of the correction amount allowed in the mounting position correction for correcting the mounting position based on the positional deviation amount executed and calculated prior to the component mounting process. Reads mounting information including the following proportions indicating a ratio of the correction amount for the serial positional displacement amount from the mounting information storage unit, the limit value and the follow-up ratio, X direction of the positional deviation amount for each electronic component of interest , Y direction and θ direction can be set for each component, and in the electronic component mounting step, the electronic component is mounted at the mounting position corrected according to a preset follow-up ratio, and the calculated displacement amount If the correction amount based on the value exceeds the limit value, an electronic component is mounted at the mounting position corrected using the limit value as the correction amount.

According to the present invention, the limit value and the follow-up ratio can be set for each component in the X direction, Y direction, and θ direction of the positional deviation amount for each target electronic component, and the position of the printed solder is detected. In the mounting position correction in which the positional deviation amount with respect to the electrode position is calculated and the mounting position is corrected based on the calculated positional deviation amount, the ratio of the correction amount to the preset positional deviation amount is shown. If an electronic component is mounted at the mounting position corrected according to the tracking ratio, and the correction amount based on the calculated displacement amount exceeds the limit value that is specified in the mounting information and indicates the upper limit of the allowable correction amount, this By mounting the electronic component at the mounting position corrected using the limit value as the correction amount, the mounting position correction based on the solder printing position can be appropriately applied according to the degree of the printing position deviation. Contact It is possible to obtain the quality improvement.

The block diagram which shows the structure of the electronic component mounting system of Embodiment 1 of this invention 1 is a block diagram showing a configuration of a screen printing apparatus according to a first embodiment of the present invention. 1 is a block diagram showing a configuration of a print inspection apparatus according to a first embodiment of the present invention. The block diagram which shows the structure of the electronic component mounting apparatus of Embodiment 1 of this invention. Structure explanatory drawing of the mounting information in the electronic component mounting apparatus of Embodiment 1 of this invention Structure explanatory drawing of the mounting mode information in the electronic component mounting apparatus of Embodiment 1 of this invention Explanatory drawing of the 1st mounting mode in the electronic component mounting apparatus of Embodiment 1 of this invention Explanatory drawing of the 2nd mounting mode in the electronic component mounting apparatus of Embodiment 1 of this invention Explanatory drawing of the application selection information of the 1st mounting mode in the electronic component mounting apparatus of Embodiment 1 of this invention The block diagram which shows the structure of the control system of the electronic component mounting system of Embodiment 1 of this invention Flowchart of electronic component mounting processing by electronic component mounting system of Embodiment 1 of the present invention Explanatory drawing of a structure and mounting mode information of the electronic component mounting system of Embodiment 2 of this invention

(Embodiment 1)
First, the electronic component mounting system according to the first embodiment will be described with reference to FIG. In FIG. 1, an electronic component mounting system 1 has a function of manufacturing a mounting substrate by mounting electronic components on a substrate, and includes a printing device M1, a printing inspection device M2, and electronic components that are a plurality of electronic component mounting devices. An electronic component mounting system formed by connecting the mounting devices M3 to M5 is connected by a communication network 2, and the whole is controlled by a management computer 3.

  The printing apparatus M1 screen-prints paste-like solder on the electrodes for joining electronic components formed on the substrate. The print inspection apparatus M2 performs a print inspection to determine the quality of the printed solder by imaging the printed circuit board, detects the position of the printed solder, and further detects the position of the electrode and the printing. A process of calculating the amount of positional deviation from the solder position is performed. That is, the print inspection apparatus M2 has a function of a solder position detection unit that detects the position of the printed solder, and a position shift amount calculation unit that calculates a position shift amount between the electrode position and the printed solder position. ing.

  The electronic component mounting apparatuses M3 to M5 pick up the electronic component from the component supply unit by the mounting head, and transfer and mount it on the mounting position of the substrate on which the solder is printed. Thereafter, the substrate after component mounting is sent to a reflow process, and a mounting substrate is manufactured by soldering an electronic component mounted on the substrate to the substrate.

  Next, the configuration of each device will be described. First, the configuration of the printing apparatus M1 will be described with reference to FIG. In FIG. 2, a substrate holder 11 is disposed on the positioning table 10. The substrate holding unit 11 holds the substrate 4 sandwiched from both sides by the clamper 11a. A mask plate 12 is disposed above the substrate holding portion 11, and a pattern hole (not shown) corresponding to a printing portion of the substrate 4 is provided in the mask plate 12. By driving the positioning table 10 by the table driving unit 14, the substrate 4 moves relative to the mask plate 12 in the horizontal direction and the vertical direction.

  A squeegee unit 13 is disposed above the mask plate 12. The squeegee unit 13 includes an elevating and pressing mechanism 13b that elevates and lowers the squeegee 13c with respect to the mask plate 12 and presses the mask plate 12 with a predetermined pressing force, and a squeegee moving mechanism 13a that horizontally moves the squeegee 13c. The elevation pressing mechanism 13 b and the squeegee moving mechanism 13 a are driven by the squeegee driving unit 15. With the substrate 4 in contact with the lower surface of the mask plate 12, the solder 5 is moved through the pattern hole by moving the squeegee 13c horizontally at a predetermined speed along the surface of the mask plate 12 to which the solder 5 is supplied. Printed on the bonding electrode 6 (see FIGS. 7 and 8) formed on the upper surface of the substrate 4.

  This printing operation is performed by controlling the table driving unit 14 and the squeegee driving unit 15 by the printing control unit 17. In this control, the operation of the squeegee 13 c and the alignment between the substrate 4 and the mask plate 12 are controlled based on the print data stored in the print data storage unit 16. The communication unit 18 exchanges data with the management computer 3 and other devices constituting the electronic component mounting system 1 via the communication network 2.

  Next, the print inspection apparatus M2 will be described with reference to FIG. In FIG. 3, a substrate holder 21 is disposed on the positioning table 20, and the substrate 4 is held on the substrate holder 21. An inspection camera 23 is disposed above the substrate holding unit 21 with the imaging direction facing downward, and the inspection camera 23 images the substrate 4 on which solder is printed by the printing apparatus M1. The inspection control unit 25 controls the inspection operation by controlling the table driving unit 24 and the inspection camera 23. By controlling the table driving unit 24 by the inspection control unit 25 and driving the positioning table 20, an arbitrary position of the substrate 4 can be positioned immediately below the inspection camera 23 and imaged.

  Image data acquired by imaging is recognized by the recognition processing unit 27, and the recognition result is sent to the print inspection processing unit 26. The print inspection processing unit 26 includes a solder position detection unit 26a and a positional deviation amount calculation unit 26b. The solder position detection unit 26a detects the position of the solder printed on the substrate 4 by the printing apparatus M1 and uses it as solder position data. Output. The positional deviation amount calculation unit 26b calculates the positional deviation amount between the position of the electrode 6 and the position of the printed solder 5 based on the solder position data. Based on these inspection results, the print inspection processing unit 26 determines whether the solder printing state is acceptable. Also, the solder position data and displacement amount are output as feedforward data, and are sent to the management computer 3 and other devices (in this embodiment, the electronic component mounting devices M3 to M5) via the communication unit 28 and the communication network 2. Sent.

  Next, the configuration of the electronic component mounting apparatuses M3 to M5 will be described with reference to FIG. 4, a substrate holding unit 30a is disposed on the positioning table 30, and the substrate holding unit 30a holds the substrate 4 conveyed from the print inspection apparatus M2 or the electronic component mounting apparatus on the upstream side. A mounting head 32 that is moved by a head driving mechanism 33 is disposed above the substrate holding unit 30a. The mounting head 32 includes a nozzle 32a that sucks an electronic component, and the mounting head 32 picks up and holds the electronic component from the component supply unit (not shown) by the nozzle 32a. Then, the mounting head 32 is moved onto the substrate 4 and lowered with respect to the substrate 4, whereby the electronic component 7 held by the nozzle 32 a is transferred and mounted on the substrate 4.

  The head drive mechanism 33 is provided with a substrate recognition camera 31 that moves integrally with the mounting head 32 with the imaging surface facing downward, and the substrate recognition camera 31 is moved onto the substrate 4 to image the substrate 4. To do. Then, the recognition processing unit 37 performs recognition processing on the imaging result, thereby recognizing the position of the substrate recognition mark and the mounting point on the substrate 4.

  The head driving mechanism 33 and the positioning table 30 are driven by a mounting head driving unit 35 and a table driving unit 34, respectively. The mounting head driving unit 35 and the table driving unit 34 are controlled by a mounting control unit 39. The mounting control unit 39 has a mounting position correction unit 39a as an internal processing function, and is based on the positional shift amount calculated by the positional shift amount calculation unit 26b in the print inspection apparatus M2 and fed forward to the electronic component mounting apparatus M3. The process of correcting the mounting position is executed prior to the execution of component mounting. In the control process by the mounting control unit 39, the mounting information 40 (see FIGS. 5 and 6) stored in the mounting information storage unit 36 is referred to. The mounting information 40 is information that defines the execution mode of the mounting operation by the electronic component mounting apparatus.

  Here, the mounting information 40 will be described with reference to FIGS. 5 and 6. First, the mounting information 40 (1) will be described with reference to FIG. The mounting information 40 (1) indicates the type of electronic component to be mounted in the electronic component mounting apparatuses M3 to M5 and the mounting coordinates on the board 4. That is, here, “component information” 40b (A, B, C,...) Indicating the component code of the target component and the component are included in each “mounting No.” 40a that individually specifies the mounting operation on the substrate. “Mounting coordinates” 40c (X1, Y1, θ1,...) Indicating the coordinate values of X, Y, and θ of the mounting points to be mounted are defined for each of the electronic component mounting apparatuses M3 to M5. By reading the mounting information 40 (1), the mounting sequence on the work target board is determined.

Next, the mounting information 40 (2) and the mounting information 40 (3) will be described with reference to FIG. The mounting information 40 (2) shown in FIG. 6 (a) is mounting mode information, and a mounting mode that defines the correction mode of the mounting position for a substrate to be mounted in the electronic component mounting apparatuses M3 to M5 is set for each electronic component. This is information set in advance. That is, “mounting information” 40b and “size” 40d (XA, YA) indicating the size of each of the target components in the X, Y, and Z directions are included in each “mounting No” 40a that individually specifies the mounting operation on the board. , ZA,..., And the execution mode applied to the component is the first mounting mode or the second mounting mode, which is indicated by a flag “1” or “2”. “ Mounting mode ” 40 e is defined correspondingly.

  Here, the first mounting mode is a mode in which the electronic component is transferred and mounted on the mounting position corrected by the mounting position correcting unit 39a based on the positional shift amount calculated by the positional shift amount calculating unit 26b. As shown in FIG. 7A, the position on the design data indicated by the “mounting coordinates” 40c of the mounting information 40 (1), that is, the barycentric position 6 * of the pair of electrodes 6 and the printed solder 5 When the center of gravity position 5 * is displaced, the mounting position PM where the electronic component 7 is actually mounted is obtained by the correction method shown in FIG.

  The example shown here shows an example in which the corrected mounting position PM is set on a position shift line L connecting the gravity center position 6 * and the gravity center position 5 *. That is, a point that is separated from the barycentric position 6 * by the correction amount ΔD on the misalignment line L is set as the mounting position PM. Here, the correction amount ΔD is calculated by multiplying the total positional deviation amount D by a preset follow-up ratio R (%) (see FIG. 6B). The follow-up ratio R is set in advance as an appropriate value for each type of electronic component based on experience values and trial results. Here, an example is shown in which the mounting position PM is set at the midpoint of the displacement line L with a follow-up ratio R of 50%. In the component mounting operation for the electrode 6, as shown in FIG. 7C, the position control of the mounting head 32 is performed with the mounting position PM calculated in this way as a target.

  By setting the mounting position PM by the correction method as described above, even when the printing position of the solder 5 does not coincide with the electrode 6 and the position is shifted, the solder 5 can be removed in the reflow process after mounting the component. Due to the self-alignment effect in which the electronic component 7 is attracted to the electrode 6 together with the molten solder due to the surface tension of the molten solder that acts on the electronic component 7 when it is melted, the influence of printing misalignment is reduced and the incidence of mounting defects is reduced. It becomes possible to suppress. Such a self-alignment effect is particularly effective for small components that are likely to cause component movement due to the surface tension of the molten solder, such as micro-sized chip components. For this reason, in the present embodiment, the first mounting mode is applied when the target electronic component 7 corresponds to a small component.

  On the other hand, the second mounting mode is a mode in which the electronic component is transferred and mounted at a mounting position based on only the position of the electrode 6 without considering the amount of solder position deviation. That is, as shown in FIG. 8A, the centroid position 6 * of the pair of electrodes 6 and the centroid position 5 * of the printed solder 5 are displaced from each other. Even when they are separated by a positional deviation amount D, the center of gravity position 6 * is set as the mounting position PM based only on the position of the electrode 6. Then, as shown in FIG. 8C, the position control of the mounting head 32 is performed with the mounting position PM set in this way as a target. In the present embodiment, the second mounting mode is applied to a large electronic component such as a connector component for which the effectiveness of the self-alignment effect cannot be expected.

Next, the mounting information 40 ( 3 ) shown in FIG. 6B will be described with reference to FIG. The mounting information 40 ( 3 ) is mode application selection information for selecting the application of the mounting mode. When the first mounting mode is applied, the range in which the first mounting mode is applied and the case where the first mounting mode is applied. This is data that prescribes the tracking ratio R and the limit value of the correction amount. That is, the “mounting mode” 40e, the “mounting mode effectiveness” 40f, and the “follow-up ratio R” that are the same as the mounting information 40 ( 2 ) are respectively included in the “mounting No” 40a that individually specifies the mounting operation on the board. 40 g and “limit value” 40 h are defined.

  The solder misalignment state of the solder 5 with respect to the pair of electrodes 6 is, as shown in FIG. 9A, the components x and y in the two horizontal directions of the misalignment line L indicating the misalignment amount and direction, and the printed 1 This is represented by a deviation angle θ of the direction line A indicated by the pair of solders 5 with respect to the reference direction (the arrangement direction of the electrodes 6). Here, for easy illustration, the misalignment state is drawn exaggerated, and such a large misalignment is not actually considered.

  In the mounting position correction for the solder position misalignment state, “effectiveness of mounting mode” 40f indicates whether or not the correction method based on the solder position misalignment amount is applied, and the solder position misalignment amounts of X, Y, and θ. Specify the direction individually. That is, the mounting position correction is applied only to the direction marked with ◯ among the three directions X, Y, and θ in “Effectiveness of mounting mode” 40f. The “follow-up ratio R” 40g defines the follow-up ratio R (%) for obtaining the correction amount for each direction marked with a circle in the “mounting mode effectiveness” 40f. That is, as shown in FIG. 9B, in calculating the corrected mounting position PM, the components of the positional deviations x, y, and θ shown in FIG. The correction amount in each direction is obtained by multiplying by the ratio R (%).

  That is, the mounting information 40 includes a follow-up ratio R (%) indicating the ratio of the correction amount to the positional deviation amount of the solder 5 calculated by the positional deviation amount calculation unit 26b. The electronic component mounting apparatuses M3 to M5 are The electronic component 7 is mounted at the mounting position PM corrected in accordance with a preset follow-up ratio R (%). The “following ratio R” 40g included in the mounting information 40 (2) can be set for each component of the positional deviation amount in the X direction, the Y direction, and the θ direction.

  Further, the “limit value” 40h is information for preliminarily defining an upper limit value for determining a correction amount for each direction in which position correction is applied. In mounting position correction, depending on the component type, if the correction amount is set too large, it may adversely affect the joint quality.Therefore, electronic components with such characteristics are allowed regardless of the amount of solder position deviation. The upper limit of the correction amount to be set is set in advance as a limit value.

  In other words, in the present embodiment, the implementation mode of the mounting operation by the electronic component mounting apparatuses M3 to M5 is defined, and the mounting information 40 stored in the mounting information storage unit 36 is transmitted by the misregistration amount calculation unit 26b of the print inspection apparatus M2. A limit value indicating the upper limit of the correction amount allowed in the mounting position correction for correcting the mounting position based on the calculated positional deviation amount of the solder 5 is included. When the correction amount calculated based on the positional deviation amount of the solder 5 by the mounting position correction unit 39a exceeds the limit value defined in the “limit value” 40h, the limit value is corrected as the correction amount. The electronic component 7 is mounted at the mounting position PM.

  As described above, by predefining “Effectiveness of mounting mode” 40f, “Following rate R” 40g, and “Limit value” 40h for each electronic component, mounting position correction based on the solder printing position is performed. It can be applied more precisely according to the characteristics. That is, since the manner of occurrence and frequency distribution of individual mounting defects vary depending on the combination of the shape of the electrode 6, the size and shape of the electronic component 7, and the viscosity of the solder 5, the mounting position PM is shifted in small increments. The data indicating the relationship between the mounting position PM and the degree of occurrence of mounting failure is experimentally obtained in advance. Then, by storing these data as mounting information 40 and applying these data according to the target electronic component 7, an application example having a high mounting difficulty such as when mounting a fine component on a fine pitch circuit board. It is possible to ensure good solder joint quality.

  Next, the configuration of the control system of the electronic component mounting system 1 will be described with reference to FIG. In FIG. 10, the management computer 3 includes an overall control unit 41, a storage unit 42, and an arithmetic processing unit 43, and is connected to the communication network 2 via a communication unit 44. The overall control unit 41 has a function of supervising control in each device constituting the electronic component mounting system 1. The storage unit 42 stores, in addition to production management data for managing work executed by the electronic component mounting system 1, solder position data 42a and mounting information 42b transmitted from the print inspection apparatus M2. The mounting information 42b is the same data as the mounting information 40 stored in the mounting information storage unit 36 in the electronic component mounting apparatuses M3 to M5.

  The arithmetic processing unit 43 executes various arithmetic processes necessary for executing the component mounting work. These calculation processes include the functions of the positional deviation amount calculation unit 43a and the position correction calculation unit 43b. The positional deviation amount calculation unit 43a performs an operation for calculating the solder positional deviation amount based on the solder position data 42a. The position correction calculation unit 43b refers to the mounting information 42b based on the calculated solder position deviation amount, and performs a calculation for mounting position correction. In the present embodiment, the calculation of the solder misregistration amount is executed by the misregistration amount calculation unit 26b of the printing inspection apparatus M2, and the calculation of the mounting position correction is executed by the mounting position correction unit 39a of the electronic component mounting apparatuses M3 to M5. However, these calculation processes may be executed by the above-described calculation function of the management computer 3.

  The print data storage unit 16 and the print control unit 17 of the printing apparatus M1 are connected to the communication network 2 via the communication unit 18, and the print inspection processing unit 26 of the print inspection apparatus M2 is connected to the communication network 2 via the communication unit 28. Connected with. As a result, the solder position data acquired by the print inspection processing unit 26 is transmitted to the management computer 3 and stored in the storage unit 42. The electronic component mounting apparatuses M3 to M5 are connected to the communication network 2 through the communication unit 38. As a result, the mounting information 42 b stored in the storage unit 42 is transmitted to each mounting apparatus and stored as mounting information 40 in the mounting information storage unit 36.

  The configuration of the electronic component mounting system 1 has a configuration in which a print inspection device M2 provided independently between the printing device M1 and the electronic component mounting device M3 is sandwiched. May be attached to the printing apparatus M1 or the electronic component mounting apparatus M3. In other words, the inspection camera 23 is disposed so that the printing apparatus M1 can capture an image of the printed substrate 4, and the functions of the inspection control unit 25, the print inspection processing unit 26, and the recognition processing unit 27 are provided in the printing inspection apparatus M2. Add to the control function. As a result, the same inspection and solder position deviation detection can be performed inside the printing apparatus M1 for the printed circuit board 4.

  The same applies to the case where these functions are attached to the electronic component mounting apparatus M3. In this case, the same inspection is performed on the board 4 directly carried from the printing apparatus M1 inside the electronic component mounting apparatus M3. It is executed prior to the component mounting operation. For example, a similar process is executed by imaging the board 4 after solder printing with a separately provided inspection camera 23 and performing a recognition process with the print inspection processing unit 26 (see FIG. 3).

  This electronic component mounting system is configured as described above. Hereinafter, an electronic component mounting method for manufacturing a mounting substrate by mounting an electronic component on a substrate by the electronic component mounting system 1 will be described along the flow of FIG. This will be described with reference to the drawings. First, mounting information is read prior to the start of production (ST1). That is, in the electronic component mounting apparatuses M3 to M5, the mounting information 40 stored in the mounting information storage unit 36 is read, and thereby information necessary for the component mounting work is captured.

  Next, solder printing is performed on the board carried into the print inspection apparatus M2 from the upstream side (ST2). That is, the solder 5 is printed on the electrodes 6 for joining the electronic components formed on the substrate 4 (printing process). The board 4 after the solder printing is carried into the printing inspection apparatus M2, where the solder inspection is executed (ST3). Here, the board 4 after solder printing is imaged to determine whether printing is good or not, and the position of the printed solder 5 is detected (solder position detection step) (ST4). Thereafter, the amount of positional deviation between the position of the electrode 6 and the position of the printed solder 5 is calculated (positional deviation amount calculating step) (ST5).

  Next, the electronic component 7 is picked up from the component supply unit by the mounting head 32 and transferred and mounted on the mounting position of the substrate 4 on which the solder 5 is printed according to a preset mounting mode (electronic component mounting step). In this electronic component mounting process, first, a mounting position correction process for correcting the mounting position based on the calculated positional deviation amount is executed (ST6), and then a component mounting operation is executed (ST7), and FIG. 7 or FIG. The electronic component 7 is mounted at the corrected mounting position PM shown in FIG.

  In this electronic component mounting process, each electronic component mounting apparatus refers to the mounting information 40 (2) shown in FIG. 6A, in accordance with the mounting mode for execution set in advance for each electronic component. Is mounted on the substrate 4. Here, as the mounting mode for execution, only the position of the electrode 6 without considering the first mounting mode in which the electronic component 7 is transported and mounted on the mounting position PM corrected based on the calculated positional deviation amount, and the positional deviation amount are not taken into consideration. One of the second mounting modes in which the electronic component 7 is transported and mounted at the mounting position PM with reference to is preset for each electronic component.

  Then, by referring to the mounting information 40 (3) shown in FIG. 6B, the first mounting mode is read by reading “effectiveness of mounting mode” 40f, “following ratio R” 40g, and “limit value” 40h. Is set as the execution mode for execution, it is determined whether or not the first mounting mode is applied to each component of the positional deviation amount in the X direction, Y direction, and θ direction. Further, the electronic component 7 is mounted at the mounting position PM corrected in accordance with the tracking ratio R (%) defined in the “tracking ratio R” 40 g with respect to the positional deviation amount in the direction to which the first mounting mode is applied. Here, when the correction amount based on the calculated positional deviation amount exceeds the limit value defined in the “limit value” 40h, the electronic component 7 is mounted at the mounting position PM corrected using this limit value as the correction amount. To do.

  Then, the substrate 4 on which the electronic component 7 is mounted in this manner is sent to a downstream reflow process, where the substrate 4 is heated according to a predetermined temperature profile, whereby the solder component in the solder 5 is melted, and the electronic The component 7 is soldered to the electrode 6. As described above, the mounting position correction based on the solder printing position in the electronic component mounting process is appropriately applied according to the characteristics of the electronic component. Can be effectively acted, and the expected effect of improving the bonding quality can be obtained.

(Embodiment 2)
In the second embodiment, the mounting mode previously set for each electronic component in the mounting information 40 in the first embodiment is fixedly set for each electronic component mounting apparatus constituting the electronic component mounting system 1. It is what you do. The electronic component mounting system 1 shown in FIG. 12A has the same device configuration as that of the electronic component mounting system 1 in the first embodiment, and a plurality of electronic component mounting devices M3, M4, and M5 in order from the upstream side. Are arranged. The electronic component mounting apparatuses M3, M4, and M5 have the same configuration as that in FIG. 4 in the first embodiment, and the mounting information storage unit 36 of these electronic component mounting apparatuses has the mounting shown in FIG. Instead of the information 40 (2), the mounting information 40 (4) shown in FIG. 12B is stored.

  The mounting information 40 (4) is the first mounting mode defined by the flags “1” and “2” shown in the “applied mounting mode” 40j for the electronic component mounting apparatus specified by the “device number” 40i. , Corresponding to the second mounting mode. Here, the first mounting mode is associated with the electronic component mounting apparatuses M3 and M4, and the second mounting mode is associated with the electronic component mounting apparatus M5. In the component mounting work by the electronic component mounting apparatuses M3, M4, and M5, the electronic component is mounted on the board according to the mounting mode for execution corresponding to the electronic component mounting apparatus with reference to the mounting information 40 (4).

  As described above, in the electronic component mounting process, the first mounting mode for performing mounting position correction based on the solder printing position is a small component that is likely to cause component movement due to the surface tension of molten solder, such as a micro-sized chip component. Applies to In the device configuration of the electronic component mounting system, generally, an electronic component mounting device for mounting a small component such as a chip component is disposed upstream, and an electronic component mounting device for mounting a large component such as a connector component is downstream. There is a strong tendency to be placed on the side.

In other words, the electronic component mounting apparatus for mounting a small component to which the first mounting mode is applied is arranged on the upstream side of the electronic component mounting system and does not perform mounting position correction based on the solder printing position. An electronic component mounting apparatus that mounts a large component to which the second mounting mode is applied is disposed on the downstream side of the electronic component mounting system. Therefore, the electronic component which is the target of the electronic component mounting system composed of a plurality of electronic component mounting apparatuses is roughly divided into two categories, small components and large components, and the electronic component mounting apparatus for mounting small components is the first. If the mounting mode and the second mounting mode are fixedly set as the mounting modes for execution on the electronic component mounting device for mounting large components, each electronic component can be mounted on one electronic component mounting device. The effect similar to that of the first embodiment is obtained without using different modes.

  The electronic component mounting system and the electronic component mounting method of the present invention have the effect that a desired bonding quality improvement effect can be obtained by appropriately applying mounting position correction based on the solder printing position, and a plurality of The present invention is useful in the field of manufacturing a mounting substrate by mounting electronic components on a substrate by solder bonding using an electronic component mounting apparatus.

DESCRIPTION OF SYMBOLS 1 Electronic component mounting system 2 Communication network 3 Management computer 4 Board | substrate 5 Solder 6 Electrode 7 Electronic component 23 Inspection camera 32 Mounting head M1 Printing apparatus M2 Printing inspection apparatus M3-M5 Electronic component mounting apparatus PM Mounting position

Claims (2)

An electronic component mounting system configured by connecting a plurality of electronic component mounting apparatuses, and manufacturing a mounting substrate by mounting electronic components on a substrate,
A printing apparatus for printing solder on the electrodes for joining electronic components formed on the substrate;
A solder position detector for detecting the position of the printed solder;
A misregistration amount calculation unit for calculating a misregistration amount between the position of the electrode and the position of the printed solder;
An electronic component mounting apparatus that picks up an electronic component from a component supply unit by a mounting head, and transfers and mounts the electronic component on a mounting position of the printed board;
Limit value indicating the upper limit of the correction amount allowed in the mounting position correction for correcting the mounting position based on the calculated amount of positional deviation, which is information defining the execution mode of the mounting operation by the electronic component mounting apparatus A mounting information storage unit that stores mounting information including
The mounting information includes a follow-up ratio indicating a ratio of the correction amount with respect to the calculated displacement amount,
The limit value and the follow-up ratio can be set for each component in the X direction, Y direction, and θ direction of the positional deviation amount for each target electronic component.
The electronic component mounting apparatus mounts an electronic component at the mounting position corrected according to a preset follow-up ratio, and when a correction amount based on the calculated displacement amount exceeds the limit value, An electronic component mounting system, wherein an electronic component is mounted at the mounting position corrected using a limit value as a correction amount. An electronic component mounting method for manufacturing a mounting substrate by mounting an electronic component on a substrate by an electronic component mounting system configured by connecting a plurality of electronic component mounting devices,
A printing step of printing solder on an electrode for joining electronic components formed on the substrate;
A solder position detecting step for detecting the position of the printed solder;
A displacement amount calculating step of calculating a displacement amount between the position of the electrode and the position of the printed solder;
An electronic component mounting step of picking up an electronic component from a component supply unit by a mounting head, and transferring and mounting the electronic component to a mounting position of the printed board;
The limit value indicating the upper limit of the correction amount allowed in the mounting position correction for correcting the mounting position based on the position shift amount executed and calculated prior to the electronic component mounting step, and the calculated position shift amount Read mounting information including a tracking ratio indicating the correction amount ratio from the mounting information storage unit,
The limit value and the follow-up ratio can be set for each component in the X direction, Y direction, and θ direction of the positional deviation amount for each target electronic component.
In the electronic component mounting step, when an electronic component is mounted at the mounting position corrected according to a preset follow-up ratio, and a correction amount based on the calculated displacement amount exceeds the limit value, An electronic component mounting method comprising mounting an electronic component at the mounting position corrected using a limit value as a correction amount.

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