JP4815377B2 - Component mounting method - Google Patents

Description

  The present invention relates to a nozzle inspection method, and more particularly to a nozzle inspection method for a mounting head of a component mounting apparatus.

  Conventionally, there is a component mounting apparatus as an apparatus for mounting an electronic component (hereinafter simply referred to as “component”) on a substrate. In a component mounting apparatus, components are taken out from a component tray and a tape feeder using a suction nozzle of a mounting head, and transferred and mounted on a substrate.

  By the way, the tip of the suction nozzle is also miniaturized corresponding to the miniaturization of parts, and the tip of the suction nozzle deteriorates every time production is repeated using the suction nozzle, and eventually the nozzle is cracked or chipped. . In such a case, the suction force of the component decreases, and as a result, the component suction posture cannot be maintained firmly due to the rotation operation of the suction nozzle and the vertical movement of the suction nozzle when mounting the component. As a result, the component mounting accuracy is adversely affected and the yield is reduced.

As a technique for solving such a problem, for example, there is one described in Patent Document 1. In this technique, a flow rate sensor is provided in an air flow path in the suction nozzle tube, the flow rate of air at the time of air blow for discharging air from the suction nozzle is measured, and abnormality of the suction nozzle is detected based on the measured value.
JP 2003-224394 A

However, the technique described in Patent Document 1 has the following problems.
That is, recently, a multi-nozzle head having a plurality of suction nozzles has become mainstream. When the technique described in Patent Document 1 is used for this multi-nozzle head, it is necessary to provide a flow rate sensor in the air flow path of all of the plurality of nozzles, or to provide a switching mechanism that switches the measurement of the flow rate sensor to each suction nozzle. is there. In either case, since the weight of the mounting head is increased, a large inertial force acts on the mounting head when the mounting head is stopped, and the mounting position accuracy is deteriorated.

  Further, in the technique described in Patent Document 1, since the flow rate in the suction nozzle tube with the component sucked is measured, when the flow rate becomes an abnormal value, is the abnormality caused by cracking or chipping of the nozzle? It is difficult to determine whether it is due to the suction state of the parts.

  SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a nozzle inspection method capable of detecting a nozzle abnormality with high accuracy without deteriorating mounting positional accuracy.

  In order to achieve the above object, a nozzle inspection method of the present invention is a method for inspecting a nozzle of a mounting head in a component mounting apparatus by a nozzle inspection means, wherein a nozzle opening for sucking or discharging air in the nozzle and the nozzle A covering step for covering the opening with the nozzle so as to communicate with the opening of the hole provided in the nozzle inspection means, and air is sucked or discharged by the nozzle, and the air is sucked or discharged. And a measuring step of measuring a flow rate of air in the hole when performing. Here, the nozzle inspection method may further include a result storage step of storing the determination result obtained in the determination step in association with the nozzle for which the determination has been performed.

  Thereby, the nozzles of the mounting head are inspected by the nozzle inspection means provided separately from the mounting head. Therefore, unlike the technique of Patent Document 1, it is not necessary to provide a flow sensor on the mounting head, so that the weight of the mounting head does not increase. As a result, it is possible to realize a nozzle inspection method capable of detecting a nozzle abnormality without deteriorating the mounting position accuracy.

  In addition, the nozzle inspection is performed in a state where no component is adsorbed. Therefore, unlike the technique of Patent Document 1, it is possible to realize a nozzle inspection method capable of detecting an abnormality caused by a crack / chip of a nozzle with high accuracy.

  Here, in the determination step, the threshold value table storing the predetermined threshold value in association with the nozzle type is referred to, and the predetermined threshold value corresponding to the nozzle type to be determined is used. A determination may be made.

  As a result, an appropriate inspection according to the type of the nozzle can be performed on the nozzle, so that a nozzle inspection method capable of detecting an abnormality of the nozzle with higher accuracy can be realized.

  The mounting head may include a plurality of nozzles, and the covering step and the measuring step may be sequentially performed on the plurality of nozzles.

  Thereby, it is possible to realize a nozzle inspection method capable of detecting a nozzle abnormality in the multi-nozzle head with high accuracy.

  The present invention also includes a mounting head having a nozzle and nozzle inspection means for inspecting the nozzle, the nozzle inspection means comprising a main body provided with a hole, and a flow rate sensor disposed in the hole. The component mounting apparatus is characterized in that the nozzle port is covered in the opening so that the nozzle port for sucking or discharging air in the nozzle communicates with the opening of the hole. You can also.

  Thereby, it is possible to realize a component mounting apparatus capable of detecting a nozzle abnormality with high accuracy without deteriorating the mounting positional accuracy.

Here, the mounting head may have a plurality of nozzles.
Thereby, it is possible to realize a component mounting apparatus capable of detecting a nozzle abnormality in the multi-nozzle head with high accuracy.

  In addition, the present invention is a component mounting method in a component mounting apparatus including a mounting head having a nozzle and nozzle inspection means, provided in the nozzle opening for sucking or discharging air in the nozzle and the nozzle inspection means. A covering step for covering the nozzle port with the opening so as to communicate with the opening of the hole, and the hole when the air is sucked or discharged by the nozzle and the air is sucked or discharged It is also possible to provide a component mounting method including a measurement step of measuring the flow rate of air in and a mounting step of mounting the component using the nozzle for which the flow rate has been measured.

  Thus, it is possible to realize a component mounting method capable of detecting a nozzle abnormality with high accuracy without deteriorating the mounting positional accuracy.

  The present invention can be realized not only as such a nozzle inspection method and component mounting apparatus, but also as a program for inspecting a nozzle of a mounting head by the method and a storage medium for storing the program. Can do.

  According to the present invention, it is possible to detect a nozzle abnormality with high accuracy without deteriorating the positional accuracy of mounting.

  Hereinafter, a nozzle inspection method according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a top view showing the configuration of the component mounting apparatus according to the present embodiment.
This component mounting apparatus includes a base 100, a conveyance path 101, a component supply unit 103, a mounting head 105, a recognition camera 106, a nozzle tip check unit 107, a waste tray 108, a nozzle station 109, and a collection conveyor 110.

  The transport path 101 is disposed at the center of the base 100, and transports and positions the substrate to the mounting stages 101a, 101b, 101c, and 101d. The component supply unit 103 is provided with a plurality of tape feeders 102 and supplies a plurality of types of components. The recognition camera 106 recognizes the component sucked and held by the mounting head 105 from below. The discard tray 108 is a tray in which parts are discarded. The nozzle station 109 holds a suction nozzle for replacement of the mounting head 105 (hereinafter also simply referred to as “nozzle”).

  2A is a perspective view of the mounting head 105, FIG. 2B is a bottom view of the mounting head 105, and FIG. 2C is a front view and a side view of the mounting head 105.

  The mounting head 105 takes out a component from the component supply unit 103 and transports and mounts it on the substrate. As shown in FIG. 2A, the mounting head 105 has a plurality of nozzles arranged at equal intervals in series in the direction perpendicular to the tape feeding direction of the tape feeder 102 (Z-axis direction in FIG. 2A). Two rows 200 are detachably attached via the nozzle flange 201. The plurality of nozzles 200 can collectively suck and hold components from the plurality of tape feeders 102.

FIGS. 3A and 3B are views for explaining the drive mechanism of the mounting head 105. FIG.
The mounting head 105 includes an H-axis motor 250, a θ motor 251, a selection valve 252, and a substrate camera 253, as shown in FIGS.

  The H-axis motor 250 moves the nozzle 200 up and down (H-axis direction). The θ motor 251 rotates the nozzle 200 around the H axis. The selection valve 252 selects the nozzle 200 that is moved up and down by the H-axis motor 250. The substrate camera 253 inspects the state of the substrate two-dimensionally or three-dimensionally.

FIG. 4 is a diagram illustrating a configuration of the nozzle tip check unit 107.
The nozzle tip check unit 107 is disposed between the component supply unit 103 and each mounting stage. As shown in FIG. 4, the nozzle tip check unit 107 includes a flow sensor 300, a main body 303, a rubber 304, a SUS (stainless steel) jig 305, and a press plate 306.

  An air flow path, that is, a hole is provided inside the main body 303. The holding plate 306 is fixed to the main body 303 with the rubber 304 and the SUS jig 305 interposed therebetween.

  The flow sensor 300 includes a tube 301 and a nipple 302 and measures the flow rate in the hole of the main body 303. The nipple 302 is disposed inside the hole of the main body 303 and is connected to the flow sensor 300 via the tube 301.

  The rubber 304, the SUS jig 305, and the presser plate 306 are provided with openings, which are arranged on the main body 303 so that the openings are located above the openings of the holes of the main body 303.

  When the nozzle 200 is inspected in the nozzle tip check unit 107 having the above configuration, as shown in the cross-sectional view of FIG. 5, a nozzle port (A in FIG. 5) for sucking air in the nozzle 200 and the body 303. The nozzle opening is covered with the opening of the hole of the main body 303 so that the opening (C of FIG. 5) communicates with the opening (B of FIG. 5). In this state, air suction by the nozzle 200 is performed, and the flow rate of air in the hole at that time is measured by the flow sensor 300. When air suction is performed by a normal nozzle 200 that is not cracked or chipped, the main body 303 and the nozzle 200 are in close contact with each other, and the hole of the main body 303 is vacuum-sealed. Therefore, by measuring the change in the flow rate in the hole of the main body 303, it is possible to detect a defective nozzle with extremely high accuracy.

FIG. 6 is a functional block diagram showing the configuration of the component mounting apparatus according to the present embodiment.
The component mounting apparatus includes a mechanism unit 440, a mounting control unit 441, a display unit 442, an input unit 443, a storage unit 444, a communication I / F unit 445, and a nozzle quality determination unit 446.

  The mechanism unit 440 is a set of mechanical components including the transport path 101, the component supply unit 103, the mounting head 105, the recognition camera 106, the nozzle tip check unit 107, and a motor and a motor controller that drive these.

  The mounting control unit 441 loads and executes NC data (mounting data) in the storage unit 444 in accordance with an instruction from the operator, and controls the mechanism unit 440 in accordance with the execution result.

  The display unit 442 is a CRT (Cathode-Ray Tube), an LCD (Liquid Crystal Display), or the like, and the input unit 443 is a keyboard, a mouse, or the like. These are used for dialogue between the component mounting apparatus and the operator.

  The storage unit 444 is a hard disk, memory, or the like, and holds mounting data 444a, a component library 444b, a nozzle pass / fail table 444c, a determination result table 444d, a flow rate threshold table 444e, and the like.

  The mounting data 444a is information relating to the mounting conditions of components, and is a collection of information indicating mounting points of all components to be mounted.

  The component library 444b is a library in which unique information about all component types that can be handled by the component mounting apparatus is collected.

  The nozzle pass / fail table 444c indicates which nozzle 200 is a defective nozzle in which suction mistakes are repeated a predetermined number of times, a defective nozzle designated in advance by the user, or a defective nozzle that is physically bent. It is a table.

  The determination result table 444d is a table composed of the nozzles for which pass / fail determination is performed and the pass / fail determination results for the nozzles 200 associated therewith, as shown in FIG. In the determination result table 444d, the numbers 1 to 10 in the “nozzle” column indicate the nozzles of the mounting head 105. “◯” in the column of “Quality determination result by nozzle quality table” indicates that the corresponding nozzle is determined to be a defective nozzle based on the nozzle quality table 444c, and “X” indicates that it is not. “O” in the column of “Pass / fail judgment result by flow rate measurement” indicates that the corresponding nozzle has been determined to be less than or equal to a predetermined threshold as a result of flow rate measurement by the nozzle tip check unit 107, and “× "" Indicates that it is determined that the value is larger than a predetermined threshold value.

  The flow rate threshold value table 444e is a table composed of nozzle types such as the nozzle shape and flow rate threshold values associated therewith as shown in FIG. In the flow rate threshold value table 444e, “nozzle A” and “nozzle B” in the “nozzle” column indicate nozzle types, and the values in the “flow rate threshold” column are individually determined according to the nozzle type. The flow rate threshold value used for the quality determination of the nozzle 200 is shown. The flow rate threshold is determined based on the flow rate measured by the nozzle tip check unit 107 when air suction is performed with a normal nozzle, that is, a nozzle that is not cracked or chipped, and varies depending on the type of nozzle.

  The communication I / F unit 445 is a LAN (Local Area Network) adapter or the like, and is used for communication between the component mounting apparatus and another component mounting apparatus.

  The nozzle quality determination unit 446 determines quality of the nozzle 200. That is, the nozzle pass / fail determination unit 446 determines whether the nozzle 200 is a defective nozzle based on the nozzle pass / fail table 444c and the flow rate measurement result by the nozzle tip check unit 107, and updates the determination result table 444d. The nozzle quality determination unit 446 and the nozzle tip check unit 107 are examples of the nozzle inspection unit of the present invention.

  Next, the inspection operation of the nozzle 200 in the component mounting apparatus having the above configuration will be described. FIG. 9 is a flowchart showing an inspection operation of the nozzle 200 in the component mounting apparatus.

  The mounting control unit 441 receives an instruction to start nozzle inspection from the user via the input unit 443 and the display unit 442, and inspects all the nozzles (i) of the mounting head 105 up to the nozzle (N) (steps S51 to S51). S61) is started. Specifically, on the screen as shown in FIG. 10, the user instructs the start of inspection by pressing the “Measurement” button, and in response to this, the inspection of the nozzle is started.

  First, the nozzle quality determination unit 446 determines whether the nozzle (i) is a defective nozzle (step S52). Specifically, it is determined whether or not the nozzle (i) is a defective nozzle in which suction mistakes are repeated a predetermined number of times, a defective nozzle designated in advance by the user, or a defective nozzle that is physically bent. judge. The determination is made by checking whether the nozzle (i) is indicated as a defective nozzle in the nozzle quality table 444c stored in the storage unit 444.

  Next, when it is determined that the nozzle (i) is a defective nozzle (Yes in step S52), the nozzle quality determination unit 446 updates the determination result table 444d and inspects the next nozzle. Specifically, in the determination result table 444d, the column of “quality determination result by nozzle quality table” of the nozzle (i) is set to “x”, and the next nozzle is inspected. Thereby, it is not necessary to perform nozzle inspection by measuring the flow rate, and the flow rate is not measured for nozzles that are already known to be defective. As a result, the efficiency of nozzle inspection is realized.

  On the other hand, when it is determined that the nozzle (i) is not a defective nozzle (No in step S52), the nozzle quality determination unit 446 determines whether or not a component is adsorbed to the nozzle (i) (step S53). Specifically, it is determined whether the nozzle (i) is performing a component suction operation according to the NC data. When the power of the component mounting apparatus is turned off while the nozzle (i) sucks the component, the nozzle (i) moves to the nozzle tip check unit 107 while sucking the component in the inspection of the nozzle (i) after the power is restored. In addition, there is a possibility that parts are sandwiched between the nozzle (i) and the nozzle tip check unit 107. Therefore, this can be avoided by determining whether or not the component is adsorbed to the nozzle (i).

  Next, when it is determined that the component is adsorbed to the nozzle (i) (Yes in step S53), the nozzle pass / fail determination unit 446 inspects the next nozzle.

  On the other hand, when it is determined that the component is not attracted to the nozzle (i) (No in step S53), the mounting control unit 441 is mounted by the mechanism unit 440 so that the nozzle (i) can be inspected. The head 105 is moved to the nozzle tip check unit 107 (step S54). Specifically, the mounting head 105 is moved so that the nozzle opening of the nozzle (i) is positioned above the opening of the hole in the main body 303 of the nozzle tip check unit 107.

  Next, the mounting control unit 441 causes the mechanism unit 440 to lower the nozzle (i) so that the nozzle (i) and the main body 303 of the nozzle tip check unit 107 are in contact with each other, and the nozzle port of the nozzle (i) and the nozzle tip check are performed. The nozzle opening is provided to cover the opening of the hole of the main body 303 so that the opening of the hole of the main body 303 of the portion 107 communicates (step S55).

  Next, the mounting control unit 441 causes the mechanism unit 440 to cause the nozzle (i) to perform air suction, and causes the flow rate sensor 300 to measure the air flow rate in the hole of the main body 303 of the nozzle tip check unit 107 at that time. (Step S56).

Next, the nozzle quality determination unit 446 determines whether or not the flow rate measured by the nozzle tip check unit 107 in step S56 is greater than a predetermined threshold (step S57). At this time, the predetermined threshold value is determined from the type of nozzle (i) to be determined and the flow rate threshold value table 444e. For example, when the determination target nozzle (i) is the type of nozzle A, the predetermined threshold is set to 1 × 10 ⁻³ L / min associated with the nozzle A in the flow rate threshold value table 444e.

  Next, when it is determined that the flow rate is greater than the predetermined threshold (Yes in step S57), the nozzle quality determination unit 446 determines that the nozzle (i) that has been inspected is a defective nozzle, and the determination result table 444d is updated (step S58). Specifically, in the determination result table 444d, the column “good / bad determination result by nozzle quality table” of the nozzle (i) is “◯”, and the “good / bad determination result by flow measurement” column is “×”.

  On the other hand, when it is determined that the flow rate is equal to or less than the predetermined threshold (No in step S57), the nozzle pass / fail determination unit 446 determines that the nozzle (i) subjected to the inspection is not a defective nozzle, and the determination result table 444d. Is updated (step S59). Specifically, in the determination result table 444d, the “good / bad determination result by nozzle quality table” column of the nozzle (i) is set to “◯”, and the “good / bad determination result by flow measurement” column is set to “◯”.

  Next, the mounting control unit 441 raises the nozzle (i) by the mechanism unit 440 (step S60).

  Finally, as shown in FIGS. 11A to 11J, the nozzles are repeatedly lowered, inspected and raised for all the nozzles (i) up to the nozzle (N), and the same inspection is performed for all the nozzles. (Steps S51 to S61), and the nozzle inspection is completed. 11A to 11J, the left diagram shows a front view of the mounting head 105, and the right diagram shows a side view of the mounting head 105.

  When all the nozzles (i) of the mounting head 105 are inspected, a screen as shown in FIG. 10 is displayed on the display unit 442 as an inspection result. In this screen, numbers 1 to 10 indicate each nozzle of the mounting head 105, “◯” indicates that the corresponding nozzle is not a defective nozzle, and “X” indicates that the corresponding nozzle is a defective nozzle in step S52. “Δ” indicates that the corresponding nozzle is determined to be a defective nozzle in step S57. For example, the nozzle indicated by 1 is determined not to be a defective nozzle, the nozzle indicated by 2 is determined to be a defective nozzle in step S52, and the nozzle indicated by 6 is determined to be a defective nozzle in step S57. It has been shown.

  As described above, according to the component mounting apparatus of the present embodiment, the nozzle 200 of the mounting head 105 is inspected by the nozzle tip check unit 107 provided separately from the mounting head 105. Therefore, unlike the technique of Patent Document 1, there is no need to provide a flow sensor on the mounting head 105, so the weight of the mounting head 105 does not increase. As a result, it is possible to detect a nozzle abnormality without deteriorating the mounting position accuracy. At the same time, even when the mounting head 105 includes a plurality of nozzles, it is not necessary to provide a mechanism for switching the nozzles for measuring the flow rate in the mounting head. It is possible to easily detect abnormality of each nozzle.

  Further, according to the component mounting apparatus of the present embodiment, the inspection of the nozzle 200 is performed in a state where no component is sucked. Therefore, unlike the technique of Patent Document 1, it is possible to detect an abnormality caused by a crack or chip of the nozzle with high accuracy.

  Further, according to the component mounting apparatus of the present embodiment, the nozzle tip check unit 107 is disposed between the component supply unit 103 and each mounting stage, specifically, on the movement path of the mounting head 105 in component mounting. The Therefore, the nozzle can be efficiently inspected even during component mounting.

  Further, according to the component mounting apparatus of the present embodiment, the flow rate threshold value used for the inspection of the nozzle 200 is determined from the type of the nozzle 200 to be determined and the flow rate threshold value table 444e, and depending on the type of the nozzle 200 be changed. Therefore, an appropriate inspection according to the type of nozzle can be performed on the nozzle, and abnormality of the nozzle can be detected with higher accuracy.

  Although the nozzle inspection method of the present invention has been described based on the embodiment, the present invention is not limited to this embodiment. The present invention includes various modifications made by those skilled in the art without departing from the scope of the present invention.

  For example, in the component mounting apparatus of the above-described embodiment, the mounting control unit receives an instruction to start inspection from the user via the input unit and the display unit, and starts inspection of the nozzle. However, the nozzle may be automatically inspected when a predetermined condition determined by the user, such as mounting a certain number of components or mounting a component on a certain number of boards, is satisfied.

  In the component mounting apparatus of the above embodiment, when it is determined that the nozzle is a defective nozzle, the mounting control unit causes the mechanism unit to replace the defective nozzle with a new nozzle or invalidate the defective nozzle. In addition, component mounting may be performed by other nozzles.

  Moreover, in the component mounting apparatus of the said embodiment, it was supposed that the air suction by a nozzle was performed and a defective nozzle was detected. However, the same effect can be obtained even if a defective nozzle is detected by discharging air with the nozzle. In this case, the flow rate threshold value in the flow rate threshold value table is determined based on the flow rate measured by the nozzle tip check unit when air is discharged from a normal nozzle, that is, a nozzle that is not cracked or chipped.

  Further, in the component mounting apparatus of the above embodiment, the nozzle tip check unit is disposed between the component supply unit and each mounting stage. However, if the nozzle tip check unit is disposed within the movable range of the mounting head, Not limited to.

  Further, in the component mounting apparatus of the above embodiment, the nozzle cracks / chips are exemplified as the nozzle abnormality. However, if the nozzle abnormality that can be detected by measuring the flow rate at the nozzle tip is limited to this, it is not limited thereto. I can't.

  The present invention can be used for a nozzle inspection method, and in particular, for a nozzle inspection method for a mounting head of a component mounting apparatus.

It is a top view which shows the structure of the component mounting apparatus of this Embodiment. (A) It is a perspective view of a mounting head. (B) It is a bottom view of a mounting head. (C) It is the front view and side view of a mounting head. (A) It is a figure for demonstrating the drive mechanism of a mounting head. (B) It is a figure for demonstrating the drive mechanism of a mounting head. It is a figure which shows the structure of a nozzle front-end | tip check part. It is a figure for demonstrating the test | inspection of the nozzle by a nozzle front-end | tip check part. It is a functional block diagram which shows the structure of the component mounting apparatus. It is a figure which shows the determination result table. It is a figure which shows a flow volume threshold value table. It is a flowchart which shows the test | inspection operation | movement of the nozzle in the said component mounting apparatus. It is a figure which shows an example of the screen which concerns on the test | inspection of the nozzle displayed on a display part. It is a figure for demonstrating a mode that a test | inspection is performed about all the nozzles of a mounting head.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Base 101 Conveyance path 101a, 101b, 101c, 101d Mounting stage 102 Tape feeder 103 Component supply part 105 Mounting head 106 Recognition camera 107 Nozzle tip check part 108 Waste tray 109 Nozzle station 110 Collection conveyor 200 Nozzle 201 Nozzle flange 250 H axis Motor 251 θ motor 252 Selection valve 253 Board camera 300 Flow sensor 301 Tube 302 Nipple 303 Main body 304 Rubber 305 SUS (stainless steel) jig 306 Press plate 440 Mechanism unit 441 Mounting control unit 442 Display unit 443 Input unit 444 Storage unit 444a Mounting Data 444b Parts library 444c Nozzle pass / fail table 444d Judgment result table 444e Flow rate threshold table 445 Communication I / Part 446 nozzle acceptability judging section

Claims (1)

A component mounting method in a component mounting apparatus comprising a mounting head having a plurality of nozzles and nozzle inspection means,
For each of the plurality of nozzles, it is determined whether the nozzle is a defective nozzle that has been repeatedly picked up by a predetermined number of times, is a defective nozzle that is designated in advance by the user, or is a defective nozzle that is physically bent. Nozzle pass / fail judgment step;
For the nozzle that is determined not to be a defective nozzle in the nozzle pass / fail determination step, the nozzle opening that sucks or discharges air in the nozzle and the opening of the hole provided in the nozzle inspection means communicate with the opening. A covering step for covering the nozzle opening;
A measurement step of sucking or discharging air with a nozzle determined not to be a defective nozzle , and measuring a flow rate of air in the hole when the air is sucked or discharged;
And a determination step of determining a crack or chipping in the nozzle tip occurs for nozzle measured value of the flow rate is greater than a predetermined threshold value,
And a mounting step of mounting the component using a nozzle determined that the flow rate value is not larger than a predetermined threshold value.

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