JP4726043B2 - Nozzle for liquid discharge and flux coating apparatus using the same - Google Patents

Description

  The present invention relates to a liquid discharge nozzle and a flux application device (also referred to as a fluxer or a fluxer device).

  For example, in a flux coating apparatus used in a pre-process of a soldering process of a printed wiring board, there is one in which an atomizer that atomizes a liquid flux is provided in a flux coating nozzle. As such an atomizing type fluxer, a full spray type (see Patent Document 1) that sprays a mist flux over the entire surface of the substrate has been frequently used. Recently, a local application type has been developed in which a predetermined amount of atomized flux is applied to each of a large number of application positions in a spot (dot) form using an ultrasonic vibration atomizer.

Japanese Examined Patent Publication No. 6-96190

  In this ultrasonic type local application fluxer nozzle, as shown in FIG. 9, a predetermined amount of liquid flux F supplied from a pump (not shown) or the like is fogged at the front end surface of the ultrasonic horn 141 provided in the atomizing unit 140. And applied to the soldering position S of the substrate W in a spot shape. At this time, in order to smoothly transfer the atomized mist flux F ′ from the tip surface of the ultrasonic horn 141 to the soldering position S, the tip opening 151 of the cover portion 150 is surrounded by the mist flux F ′. Pressurized air G is ejected from the air. The pressurized air G is sent from the outside through an air supply joint 171 to an air charge chamber 160 formed inside the cover unit 150 (between the cover unit 150 and the ultrasonic horn 141). The charge chamber 160 and the opening 151 are in communication. The fluxer shown in FIG. 9 does not require masking to cover the substrate W other than the spot-shaped soldering position S and does not require recovery of the mist-like flux F ′ that has not been applied. Can be planned.

  However, in the ultrasonic local application fluxer nozzle as shown in FIG. 9, the air supply joint 171 is provided only at one place in the circumferential direction of the cylindrical cover portion 150. There may be a circumferential deviation in the pressure distribution. As a result, when the jet flow of the pressurized air G surrounding the mist flux F ′ is not symmetrical with respect to the axis, soldering is performed depending on the degree of deviation between the application position of the mist flux F ′ and the soldering position S. There is a risk of quality degradation. Further, once the shape of the nozzle is determined, the application shape and application area of the flux cannot be changed. For example, to apply an elliptical shape (oval shape), it is necessary to replace it with a dedicated ultrasonic horn.

  On the other hand, for example, when such a flux coating nozzle is used in a flux coating apparatus, particularly one that is applied to a large number of soldering positions such as soldering a printed wiring board, the flux coating position and the soldering position Deterioration of soldering quality due to misalignment (in the extreme case, decrease in yield), securing of skillful techniques for misalignment correction, and the like will lead to an increase in manufacturing cost.

  An object of the present invention is to provide a liquid discharge nozzle that can be easily adjusted so that the liquid discharge direction coincides with the axial direction, a liquid discharge nozzle that can easily adjust the application shape and application area, and the use of them. An object of the present invention is to provide a flux coating apparatus capable of performing flux coating with high efficiency and high accuracy and suppressing an increase in manufacturing cost.

Means for Solving the Problems and Effects of the Invention

In order to solve the above problems, a liquid discharge nozzle which is a premise of the present invention is:
An axial atomizing section for atomizing a predetermined amount of liquid at the tip surface;
A mist-like liquid for making the tip surface of the atomizing portion project outside or surrounding the periphery of the atomizing portion with a predetermined distance in the radial direction around the atomizing portion, or for projecting the tip surface of the atomizing portion to the outside. A cylindrical cover portion having an opening on one end side for discharging to the outside;
An annular space formed between the atomizing part and the cover part and communicating with the opening is divided and formed in the circumferential direction, and is ejected from the opening in a form surrounding the mist-like liquid. A plurality of pressure chambers filled with a pressurized gas of
A plurality of supply parts for supplying the pressurized gas for each pressure chamber,
By adjusting the pressure and / or flow rate of the pressurized gas individually for each of the pressure chambers in the supply unit, the discharge direction of the atomized liquid that is atomized at the tip surface of the atomizing unit and discharged in a spot shape which may be adjustable to.

  According to this nozzle for discharging liquid, by adjusting the pressure and flow rate of the pressurized gas individually for each of the plurality of pressure chambers, the flow of the pressurized gas ejected from the opening is symmetrical (circular) Columnar shape, conical shape, truncated cone shape, etc.). As a result, the mist-like liquid ejected in the form of a spot from the tip surface of the atomizing section is evenly surrounded by the flow of pressurized gas and easily adjusted so that the liquid ejection direction coincides with the axial direction. it can.

In order to solve the above-mentioned problem, the liquid discharge nozzle of the present invention is
An axial atomizing section for atomizing a predetermined amount of liquid at the tip surface;
A cylindrical cover portion having an opening on one end side for projecting the tip end surface of the atomizing portion to the outside, surrounding the periphery with a predetermined distance in the radial direction around the atomizing portion,
A mist-like liquid formed between the atomizing part and the cover part and formed by dividing an annular space communicating with the opening part in the circumferential direction and atomized at the tip surface of the atomizing part A plurality of pressure chambers filled with pressurized gas for ejecting from the opening in a form surrounding
A plurality of supply parts for supplying the pressurized gas for each pressure chamber,
The atomizing section has an ultrasonic vibration section that reduces in diameter as it goes to the tip.
A partition for partitioning into the plurality of pressure chambers is formed to project from the inner peripheral wall of the cover portion toward the ultrasonic vibration portion side on the radially inner side,
Between the tip edge of the partition wall and the outer peripheral surface of the ultrasonic vibration unit, avoid contact between the tip edge of the partition wall and the outer peripheral surface of the ultrasonic vibration unit during vibration of the ultrasonic vibration unit, And a gap capable of providing a pressure difference between the adjacent pressure chambers is formed,
Discharge of a mist-like liquid that is atomized at the front end surface of the ultrasonic vibration part and discharged in the form of a spot by individually adjusting the pressure and / or flow rate of the pressurized gas for each pressure chamber in the supply unit By changing the direction continuously or intermittently, it is possible to adjust the application shape and / or the application area in units of liquid spots .

  According to this nozzle for discharging liquid, by adjusting the pressure and flow rate of the pressurized gas individually for each of the plurality of pressure chambers, the ejection direction of the ejection flow of the pressurized gas ejected from the opening is inclined with respect to the axis. It can be easily crossed. Accordingly, the spray direction of the mist-like liquid ejected in a spot form from the tip surface of the atomizing section is changed, so that the application shape and the application area can be easily adjusted. For example, if the pressure and flow rate of the pressurized gas supplied to a specific pressure chamber are made larger than those of other pressure chambers, the jet direction of the jet flow can be biased toward the radial symmetrical position, and the coating shape Can be changed from a circular shape to an elliptical shape (oval shape). Note that pressurized air, nitrogen gas, inert gas (Ar, He, etc.), etc. are used as the pressurized gas (jet flow).

  In these liquid discharge nozzles, the atomizing section has an ultrasonic vibration section (ultrasonic horn) whose diameter is reduced toward the tip, and a partition for partitioning into a plurality of pressure chambers is provided in the cover section. It protrudes and forms toward the ultrasonic vibration part side of a radial inside from a surrounding wall, and a clearance gap can be formed between the front-end edge of a partition and the outer peripheral surface of an ultrasonic vibration part. By using an ultrasonic vibration type atomizing section, the liquid can be discharged or applied as a fine mist. At that time, since a gap is formed between the leading edge of the partition wall and the outer peripheral surface of the ultrasonic vibration section, the minute vibration of the ultrasonic vibration section (ultrasonic horn) is not directly transmitted to the partition wall, Since there is no bias in the pressure distribution, stabilization of the liquid ejection direction and application position is promoted.

  In addition, through the gap between the leading edge of the partition wall and the outer peripheral surface of the ultrasonic vibration unit, a slight amount of pressurized gas flows between the adjacent pressure chambers. It is only necessary to avoid contact due to the amplitude (approximately 2 μm), and not so much that the gas pressures in the two pressure chambers are made uniform. Therefore, it is sufficiently possible to provide a pressure difference (pressure gradient) between adjacent pressure chambers, and adjustment (change) of the application shape and application area described above can be performed by adjusting the pressure of the pressurized gas supplied to each pressure chamber. Can be achieved.

  By the way, when the opening side end (bottom end; tip) of the cylindrical cover part is formed in a reduced diameter part that is reduced in diameter toward the tip side, for example, the axis of the nozzle is set to the surface of the printed wiring board. If the outer surface of the reduced diameter portion is inclined and positioned parallel to the substrate surface, the flux can be applied to the corner of the substrate, and the versatility of the liquid discharge nozzle is enhanced.

Next, in order to solve the above problems, the flux coating apparatus of the present invention is:
The liquid discharge nozzle described above;
A reservoir for storing a liquid flux to be applied to the soldering position as a liquid;
A syringe pump that sucks and stores the flux from the reservoir, discharges the flux every predetermined amount, and supplies it to the nozzle ;
A switching line for switching a pipe line connecting the reservoir and the syringe pump and a pipe line connecting the syringe pump and the nozzle ;
By switching the pipeline with the switching valve, the flux in the reservoir is stored in the syringe pump, the flux in the syringe pump is discharged and supplied to the liquid discharge nozzle, and the flux supplied from the syringe pump is discharged into the liquid. It is characterized by being atomized by an ultrasonic vibration part of a nozzle for discharge, ejected in a mist form, and applied in a spot form at a soldering position.

  Thus, by using the above-mentioned liquid discharge nozzle as a flux application nozzle and applying it to a flux application device, the discharge direction of the atomized flux is stabilized, and the application position of the atomized flux is a soldering position. It becomes easy to match. And it can apply | coat with high precision to the workpiece | work which has many application | coating positions like a printed wiring board by making a trace amount (for example, 1 ml or less per time) flux into the spot shape of a minute diameter (for example, 0.1 mm or less). Therefore, it is possible to reduce the occurrence rate of defective products based on the deviation of the flux application position from the soldering position (improving the soldering quality and consequently the work yield), and special skill is required to correct the deviation. do not do. In addition, the application shape and application area can be easily adjusted (changed) without using a dedicated ultrasonic horn, so the shape and area of flux application can be changed and adjusted according to the soldering shape and area. Can do.

(Example)
Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings. FIG. 1 is an exploded perspective view showing an example of a flux coating nozzle according to the present invention, FIG. 2 is a front sectional view of the flux coating nozzle, and FIG. 3 is a sectional view taken along line AA in FIG. As shown in FIG. 1, the flux application nozzle 3 (liquid discharge nozzle) is a predetermined amount (for example, 100 μl per time) of liquid flux F (for example, 100 μl per time) supplied from a syringe pump unit 1 (see FIG. 5) described later. An axial atomizing portion 40 for atomizing the liquid) at the front end surface, a cylindrical cover portion 50 surrounding the periphery of the atomizing portion 40 at a predetermined distance in the radial direction, and the atomizing portion 40 A plurality of (for example, four) air charge chambers 60A to 60D (pressure chambers) formed by equally dividing the annular space formed between the cover portion 50 in the circumferential direction and the air charge chambers 60A to 60A. The same number of supply units 70A to 70D as the number of air charge chambers for supplying air G (pressurized gas) pressurized by a compressor 75 (see FIG. 4) or the like every 60D are provided.

  As shown in FIGS. 2 and 3, the atomizing unit 40 has an ultrasonic horn 41 (ultrasonic vibrating unit) that has a diameter that decreases toward the tip and that vibrates at least in the axial direction (vertical direction) (for example, amplitude 2 μm). ) And the atomization of the liquid flux F is performed on the tip surface of the ultrasonic horn 41. The ultrasonic horn 41 is held by the support portion 42 via a buffer member (not shown) such as a damper. Moreover, the support part 42 is screwed together with the cover part 50 by the screw part 42a formed in the outer peripheral surface. Therefore, the liquid flux F supplied from the flux supply joint 43 (liquid supply port) passes through the through hole 40a formed through the atomizing portion 40 in the axial direction (vertical direction) and passes through the tip surface of the ultrasonic horn 41. Atomized by minute vibration.

  On one end side (lower end side) of the cover portion 50, an opening portion 51 for projecting the tip end surface of the ultrasonic horn 41 (atomization portion 40) to the outside is formed. Below the opening 51, the outlet side (lower end side) of the through hole 40 a that penetrates the atomizing part 40 is open. Moreover, the opening part 51 and each air charge chamber 60A-60D are connected.

  The four air charge chambers 60A to 60D are filled with pressurized air G respectively supplied from the corresponding supply units 70A to 70D, and the compressed air G is supplied to the ultrasonic horn 41 (the atomizing unit 40). It is ejected from the opening 51 so as to surround the mist-like flux F ′ atomized at the front end surface. These air charge chambers 60 </ b> A to 60 </ b> D are defined by four partition walls 61, 61, 61, 61 that project from the inner peripheral wall of the cover portion 50 toward the radially inner ultrasonic horn 41 side. . A gap K is formed between the leading edge (upper edge and inner edge) of each partition wall 61 and the outer peripheral surface of the ultrasonic horn 41 so that they do not interfere with each other due to vibration of the ultrasonic horn 41.

  As shown in FIG. 4, the pressurized air G from the compressor 75 corresponds to the corresponding air charge chamber 60 </ b> A via a plurality of (here, four) supply units 70 </ b> A to 70 </ b> D arranged in parallel to the compressor 75. It is distributed and supplied to ˜60D. In each of the supply units 70A to 70D, a two-port two-position electromagnetic switching valve 74, a pressure regulator 73, a flow rate adjustment valve 72, and the like are arranged in series, and the air supply screwed to the peripheral surface of the cover unit 50 It introduces into each air charge chamber 60A-60D from the joint 71 (gas supply port). The air supply joint 71 is fixed by screwing a male screw portion 71 a with a female screw portion 50 a formed on the wall portion of the cover portion 50.

  Each electromagnetic switching valve 74 has a position (a position) for supplying the pressurized air G from the compressor 75 to the air charge chambers 60 </ b> A to 60 </ b> D and a position (b position) for stopping the supply according to a control signal from the controller 76. Can be switched simultaneously. Each flow rate adjustment valve 72 individually adjusts the flow rate of the pressurized air G supplied to each of the air charge chambers 60 </ b> A to 60 </ b> D by a control signal from the controller 76. Similarly, each pressure regulator 73 individually adjusts the pressure of the pressurized air G supplied to each of the air charge chambers 60 </ b> A to 60 </ b> D by a control signal from the controller 76.

  Therefore, in each of the supply units 70A to 70D shown in FIG. 4, the pressure of the pressurized air G is individually adjusted for each of the air charge chambers 60A to 60D by the pressure regulator 73 or the flow rate thereof by the flow rate adjustment valve 72. Can do. As a result, as shown in FIG. 2, the discharge direction of the mist-like flux F ′ that is atomized at the tip surface of the ultrasonic horn 41 and discharged in a spot shape and the discharge direction of the pressurized air G are set in a predetermined direction (for example, It can be applied to the soldering position S by adjusting it vertically downward).

  Further, by adjusting the pressure regulator 73 and the flow rate adjustment valve 72 in the same manner as described above, the ejection direction of the pressurized air G and the ejection direction of the mist-like flux F ′ are swung as shown in FIG. By changing (fluctuating), the application shape can be made elliptical (oval). If the jet direction of the pressurized air G and the discharge direction of the mist-like flux F ′ are rotated once around the axis, it can be formed in a circular shape with a large coating area (diameter). Moreover, such adjustment of the application shape and application area is possible by adjusting the pressure regulator 73 and the flow rate adjustment valve 72, and it is not necessary to replace the ultrasonic horn 41. Therefore, the flux application process and the soldering process are performed. There is no need to interrupt for a long time.

  As shown in FIG. 2, the opening 51 side end portion (lower end portion; tip portion) of the cylindrical cover portion 50 is formed in a reduced diameter portion 52 that is reduced in diameter (for example, 45 ° tapered) toward the tip end side. ing. Therefore, as shown in FIG. 8, if the axis of the nozzle 3 is inclined with respect to the surface of the printed wiring board W and the outer surface of the reduced diameter portion 52 is positioned parallel to the surface of the board W, It becomes possible to apply the mist-like flux F ′ to the corner, and the application work in a narrow place becomes possible.

  FIG. 5 is a piping diagram showing an example of a flux coating apparatus using the flux coating nozzle of FIG. 5 stores the flux coating nozzle 3 described in FIGS. 1 to 3 and the liquid flux F (liquid) to be applied to the soldering position S of the printed wiring board W (work). A tank 2 (reservoir) and a syringe pump unit 1 that discharges the flux F stored in the syringe pumps 10 </ b> A and 10 </ b> B from the storage tank 2 every predetermined amount and supplies the flux F to the nozzle 3 are provided.

  The syringe pump unit 1 includes a pair of syringe pumps 10 </ b> A and 10 </ b> B in which liquid flux F is accommodated and arranged in parallel, a single reversible electric motor 20 (drive source; for example, a stepping motor), and a motor 20. And a transmission mechanism 30 that simultaneously transmits power to the syringe pumps 10A and 10B.

  Syringe pumps 10A and 10B include cylinders 11A and 11B in which openings 11a and 11a for discharging or sucking flux F are formed on one end side, and pistons slidably inserted from the other end sides of the cylinders 11A and 11B. 12A, 12B. The pair of syringe pumps 10A and 10B are arranged in parallel to each other so that the axes thereof are directed substantially vertically up and down. And opening part 11a, 11a is formed in the upper end part of cylinder 11A, 11B, respectively.

  The motor 20 linearly moves the pistons 12A and 12B of the syringe pumps 10A and 10B in the axial direction, and discharges or sucks the flux F from the openings 11a and 11a every predetermined amount. Further, the transmission mechanism 30 transmits the driving force of the motor 20 to the syringe pumps 10A and 10B so that the moving directions of the pistons 12A and 12B are opposite to each other between the pair of syringe pumps 10A and 10B.

  By the way, the transmission mechanism 30 has a swing arm 31 (swing member) that can swing within a predetermined angle range around a swing support shaft 31a (fulcrum) provided at the center. Both end portions of the swing arm 31 are respectively engaged with the base end portions (lower end portions) of the pistons 12 </ b> A and 12 </ b> B and are swung by the motor 20. Specifically, a ball screw 39 (screw member) connected to the motor 20 via the coupling 21 is arranged in parallel to the pistons 12A and 12B. The female screw member 39a of the ball screw 39 is slidably seated on a linear guide 39b that is connected to the base end portion of one piston 12A and arranged in parallel with the piston 12A.

  A four-port two-position electromagnetic switching valve 101A is interposed in a pipe line from the opening 11a of the cylinder 11A to the nozzle 3 and a pipe line from the storage tank 2 to the opening 11a of the cylinder 11A. Similarly, a four-port two-position type electromagnetic switching valve 101B is interposed in a pipe line from the opening 11a of the cylinder 11B to the nozzle 3 and a pipe line from the storage tank 2 to the opening 11a of the cylinder 11B. . In addition, based on detection signals from the limit switches 102A and 102B that define the swing range of the swing arm 31, an operation control signal is issued to the electromagnetic switching valves 101A and 101B (solenoid thereof) and the motor 20.

  In FIG. 5, the electromagnetic switching valve 101A is in a position (position a) where the opening 11a of the cylinder 11A communicates with the nozzle 3, and the electromagnetic switching valve 101B is a position where the storage tank 2 communicates with the opening 11a of the cylinder 11B. It is in (a position). In this state, when the motor 20 rotates in one direction (for example, counterclockwise), one piston 12A moves upward, and the flux F in the cylinder 11A is discharged from the opening portion 11a at regular intervals. The flux F is supplied to the nozzle 3 via the electromagnetic switching valve 101 </ b> A, and the liquid flux F (or the mist flux F ′ described above) is applied to the soldering position S of the printed wiring board W. The other piston 12B moves downward, draws the flux F from the storage tank 2 via the electromagnetic switching valve 101B, sucks the flux F from the opening 11a at a constant amount, and stores it in the cylinder 11B.

  When the swing arm 31 comes into contact with the limit switch 102B, based on the detection signal, as shown in FIG. 6, the electromagnetic switching valve 101B communicates the opening 11a of the cylinder 11B with the nozzle 3 (position b). The electromagnetic switching valve 101A is switched to a position (b position) where the storage tank 2 communicates with the opening 11a of the cylinder 11A. At the same time, the rotation of the motor 20 is also switched in the reverse direction (for example, clockwise), and the other piston 12B moves upward to discharge the flux F in the cylinder 11B from the opening portion 11a at a constant amount. The flux F is supplied to the nozzle 3 via the electromagnetic switching valve 101B, and the liquid flux F (or the mist flux F ′ described above) is applied to the soldering position S of the printed wiring board W. One piston 12A moves downward, draws the flux F from the storage tank 2 through the electromagnetic switching valve 101A, sucks the flux F from the opening 11a at a constant amount, and stores it in the cylinder 11A.

  When the swing arm 31 contacts the limit switch 102A, the process of FIG. 5 is repeated again. Similarly, the discharge and suction of the flux F from the opening 11a are continuously performed without stopping the flux applying apparatus 100 for a long time.

  The swing arm 31 contacts the limit switch 102B (or 102A), the electromagnetic switching valves 101A and 101B are switched to the b position (or a position), and the motor 20 is rotated and changed clockwise (or counterclockwise). The piston 12B (or 12A) can be moved upward (empty shot) at a place other than the soldering position S for an initial predetermined time (predetermined number of times). Thus, even if bubbles such as outside air are mixed in the suction process, the bubbles can be discharged (bleed out) from the cylinder 11B (or 11A) after the suction process is completed and before the discharge process is started.

  In addition, it is desirable to apply a pressurized pressure to the liquid surface of the flux F by introducing the pressurized gas (for example, pressurized air) with the storage tank 2 sealed through these steps. Thereby, in the suction process, the pumping from the storage tank 2 by the syringe pumps 10A and 10B is facilitated, and the mixing frequency of bubbles is also reduced.

  In the embodiment described above, only the case where the liquid discharge nozzle is applied to the flux application apparatus 100 as the flux application nozzle 3 has been described, but the liquid discharge nozzle can also be applied to other liquids.

The exploded perspective view showing an example of the nozzle for flux application concerning the present invention. FIG. 2 is a front sectional view of the flux coating nozzle of FIG. 1. AA sectional drawing of FIG. The piping diagram of the nozzle for flux application of FIG. The piping diagram which shows an example of the flux application | coating apparatus using the nozzle for flux application | coating of FIG. The piping diagram which shows the operation state different from FIG. Explanatory drawing which shows an example of a flux application | coating state. Explanatory drawing which shows the other example of a flux application state. Sectional drawing which shows the nozzle for conventional flux application | coating.

Explanation of symbols

1 Syringe pump unit 2 Storage tank (storage part)
3 Nozzle for flux application (nozzle for liquid discharge)
10A, 10B Syringe pump 40 Atomization part 41 Ultrasonic horn (ultrasonic vibration part)
50 Cover 51 Opening 60A-60D Air charge chamber (pressure chamber)
61 Bulkhead 70A-70D Supply part 71 Air supply joint (gas supply port)
72 Flow control valve 73 Pressure regulator 100 Flux application device F Liquid flux (liquid)
F 'mist flux G Pressurized air (pressurized gas)
K gap S soldering position (application position)
W Printed wiring board (workpiece)

Claims (2)

An axial atomizing section for atomizing a predetermined amount of liquid at the tip surface;
A cylindrical cover portion having an opening on one end side for projecting the tip end surface of the atomizing portion to the outside, surrounding the periphery with a predetermined distance in the radial direction around the atomizing portion,
A mist-like liquid formed between the atomizing part and the cover part and formed by dividing an annular space communicating with the opening part in the circumferential direction and atomized at the tip surface of the atomizing part A plurality of pressure chambers filled with pressurized gas for ejecting from the opening in a form surrounding
A plurality of supply parts for supplying the pressurized gas for each pressure chamber,
The atomizing section has an ultrasonic vibration section that reduces in diameter as it goes to the tip.
A partition for partitioning into the plurality of pressure chambers is formed to project from the inner peripheral wall of the cover portion toward the ultrasonic vibration portion side on the radially inner side,
Between the tip edge of the partition wall and the outer peripheral surface of the ultrasonic vibration unit, avoid contact between the tip edge of the partition wall and the outer peripheral surface of the ultrasonic vibration unit during vibration of the ultrasonic vibration unit, And a gap capable of providing a pressure difference between the adjacent pressure chambers is formed,
Discharge of a mist-like liquid that is atomized at the front end surface of the ultrasonic vibration part and discharged in the form of a spot by individually adjusting the pressure and / or flow rate of the pressurized gas for each pressure chamber in the supply unit A liquid discharge nozzle characterized by being capable of adjusting a coating shape and / or a coating area in units of liquid spots by changing the direction continuously or intermittently. A nozzle for discharging liquid according to claim 1 ;
A reservoir for storing a liquid flux to be applied to the soldering position as the liquid;
A syringe pump that sucks and stores the flux from the storage unit, discharges the flux every predetermined amount, and supplies the nozzle to the nozzle ;
A switching line for switching a pipe line connecting the reservoir and the syringe pump and a pipe line connecting the syringe pump and the nozzle ;
By switching the pipeline by the switching valve, the flux in the reservoir is stored in the syringe pump, and the flux in the syringe pump is discharged and supplied to the liquid discharge nozzle, which is supplied from the syringe pump. The flux application apparatus, wherein the flux is atomized by an ultrasonic vibration part of the liquid discharge nozzle, discharged in a mist form, and applied in a spot form at the soldering position.

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