JPS6059023B2 - liquid applicator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid coating device, for example, a liquid coating device used for coating a flux liquid as a pre-treatment for soldering performed after electronic components are placed on a printed board.
To provide a device that can always uniformly apply atomized particles such as flux liquid obtained by an ultrasonic atomization device to an object to be coated such as a printed board, depending on its size, etc. There are things aimed at.

Conventionally, flux liquid is atomized using an ultrasonic atomizer,
As an apparatus for coating printed boards, an apparatus as shown in FIG. 1 has been proposed, and its configuration and operation will be explained with reference to FIG.

An ultrasonic atomizer 2' is fixed to the bottom side surface of the atomized particle transport passage 1' by a support plate 3'.

An oscillator 4' is connected to the ultrasonic atomizer 2' via a conductive wire, and a liquid supply pipe 6 is connected to one end of a liquid passage 5' formed inside the ultrasonic atomizer 2'. ' is connected, and the other end is open to the atomization surface 7'. In addition,
A liquid supply pipe 6' connects the ultrasonic atomizer 2' and a tank 9' via a liquid supply device 8'. Further, at the bottom of the atomized particle conveyance passage 1', a liquid discharge pipe 10' connected to the tank 9' and a blower device 11' are provided. Note that a printed board 13'', which is an object to be coated, is located above the tip 12' of the atomized particle transport path 1'. While vibrating the atomizing surface 7'' of the ``
The flux liquid is supplied to the atomizing surface 7'' through the liquid supply vibrator 6'' and the liquid passage 5'', and the flux liquid is atomized by ultrasonic vibration of the atomizing surface 7''.

On the other hand, the air supplied into the atomized particle conveyance passage 1'' by the blower 1'' mixes with the atomized flux liquid and conveys this flux liquid upward in the atomized particle conveyance passage 1''. , from the tip 12'', thereby applying atomized particles of flux liquid to the reprint board 13''. However, in the conventional example shown in FIG. A large amount of the flux liquid adhered to the inner wall of the atomized particle conveying passage 1'' while being conveyed through the atomized particle conveying passage 1''.

Therefore, in order to apply the required amount of flux liquid to the printed board 13'', it is necessary to apply the printed board 13'' for a longer time.
It was necessary to position it above the tip 12'' of the atomized particle conveyance passage 1''. As an automatic soldering device, this has the problem of slowing down the advancing speed of the printed board 13'' and reducing productivity.Furthermore, the flux liquid adhering to the inner wall of the passageway is The liquid returns to the tank 9'' through the liquid discharge vibrator 10'' opened at the bottom of the tank 9'', and is again sent to the atomizing surface 7'' by the liquid supply device 8'' to be atomized. During this time, the solvent in the flux liquid is dispersed into the air, causing the flux liquid to leak. Since the specific gravity changes, it has been difficult to control the optimum specific gravity of the flux liquid applied to the printed board 13''.

In addition, a second method to improve the drawbacks of the conventional example described above
A coating device like the one shown in the figure can be considered. -ru.

Its structure and operation will be explained with reference to FIG. 2, where the same numbers as above indicate the same members.

An ultrasonic atomizer 2'' is fixed to the bottom of the air passage 14'' via a support plate 3''.A blower device 1'' is connected to the side of the bottom, and a The bottom part and the tank 9'' are connected by the liquid discharge vibrator 1''. Also, the atomizing surface 7'' and the tip 15'' of the air passage 14''
are located at approximately the same height. The printed board 13'' is located relatively close above the atomizing surface 7'' and the tip 15''. In the above configuration, the oscillator 4'' is driven to generate the atomizing surface 7''. When the flux liquid is atomized by the ultrasonic vibration of the
Due to the airflow supplied to the inside and discharged from the tip 15'', the atomized air reaches the printed board 13'' located above the atomizing surface 7'' while being scattered, and is applied to the coating surface. However, in this configuration, since the width over which the atomized flux is scattered is small, the printed board 13'' that can be coated
The disadvantage was that it was limited to small sizes.

In addition, the flux liquid atomized and scattered on the atomization surface 7 is dense in the central part and thin in the peripheral part, so that the printed board 13''
It also had the disadvantage of creating shading when applied. The present invention solves the above-mentioned drawbacks and applies flux liquid etc. uniformly regardless of the size of the printed board.
Hereinafter, the configuration and operation of one embodiment of the present invention will be explained with reference to FIG. 3.

The ultrasonic atomizer 2 is provided so as to be movable substantially parallel to the coating surface of a printed board 13, which is used as an example of an object to be coated. The air passage 14 containing the ultrasonic atomizer 2 is fixed on the rack 16, and is connected to the blower 11 via an expandable duct 17. A liquid passage 5 is formed inside the ultrasonic atomization device 2, one end of which is connected to a liquid supply vibrator 6, and the other end connected to an atomization surface 7.
It is open to The liquid supply vibrator 6 is configured to be expandable and retractable, and is connected to a tank 9 via a liquid supply device 8 . A pinion 18 is engaged with the rack 16 when rotated by a motor (not shown), and the rack 16
is configured to move left and right along a guide (not shown). Further, the switch 19 and the switch 20 serve as limit switches that change the direction of rotation of the motor and reverse the direction of movement of the rack 16 engaged with the pinion 19. Further, a liquid discharge vibrator 10 is provided at the bottom of the main body 21 and communicates with the tank 9. Air is supplied into the main body 21 from a bypass air hole 22 provided in the duct 17, and a printed board 13 is provided in the upper part of the main body 21.
is located. In the above configuration, an oscillator (not shown)
The atomization surface 7 of the ultrasonic atomization device 2 is vibrated in the ultrasonic range, and the flux liquid in the tank 9 is supplied to the atomization surface via the liquid supply vibrator 6 and the liquid passage 5 by the liquid supply device 8. 7, the flux liquid is atomized by ultrasonic vibration of the atomization surface 7. On the other hand, air supplied from the blower 11 enters the air passage 14 and at the same time enters the main body 21 through the bypass air hole 22, and is transported to prevent the atomized particles from falling or adhering to the printed board 13. Apply flux liquid to. Further, the pinion 18 driven by a motor whose rotation direction is reversed by switches 19 and 20 moves the rack 16 left and right, and moves the ultrasonic atomizer 2 and air passage 14 fixed to the rack 16 left and right. . Therefore, the atomized particle bundle of the flux flow discharged from the atomization surface 7 also moves from side to side. At this time, when the printed board 13 is continuously moved like an automatic soldering device, as shown in FIG.
The ultrasonic atomizer 2
The direction of movement B is from right angle to A. By moving 15B at a certain angle so that they are not parallel to each other, the atomized particles of the flux liquid can be uniformly applied over the entire surface of the printed board 13, and furthermore, if the size of the printed board 13 changes, , by changing the position of the switches 19 and 20 or changing the motor rotation speed to change the moving width and moving speed of the ultrasonic atomizer 2, or by changing the moving speed of the printed board 13, a uniform flux can be obtained at all times. It becomes possible to apply liquid. Another embodiment of the invention is shown in FIG.

In this embodiment, in contrast to the embodiment shown in FIG. This prevents the atomized particles from falling due to their own weight. In addition, only the ultrasonic atomizer 2 is connected to the rack 1.
6 and move left and right. At this time, the flux liquid supplied to the atomization surface 7 reaches the reprint board 13 and is coated thereon due to the atomization energy mainly generated by ultrasonic vibration. Further, an embodiment of the present invention will be explained with reference to FIG.

The air passage 14 containing the ultrasonic atomizer 2 is configured to be rotatable about a support shaft 24, and is constantly brought into contact with a cam 26 by a spring 25. A blower device 11 is connected to the air passage 14 via an expandable duct 17. The cam 26 is rotated about a rotating shaft 27 by a motor (not shown). The other parts are the same as the embodiment shown in FIG. To explain the operation in this embodiment, the flux liquid is atomized by the ultrasonic atomization device and applied to the printed board 13 located at the top, and at the same time, the cam 26 is rotated by the motor. Since the rotating shaft 27 of the cam 26 is eccentrically provided, as the cam 26 rotates, the air passage 14, which is constantly in contact with the cam 26 by the spring 25, swings about the supporting shaft 24 as a fulcrum.
As a result, the atomizing surface 7 moves left and right, and the printed board 13 is coated with atomized particles at the same time. At this time, as shown in FIG. 4, by making the swinging direction of the air passage 14 and the ultrasonic atomizer 2 at a certain angle that is not perpendicular or parallel to the traveling direction of the printed board 13, a wide area can be obtained. The flux liquid can be uniformly applied to the printed board 13 with the handle. In each of the above embodiments, the ultrasonic atomizer 2 is positioned perpendicularly to the printed board 13, but as in the embodiment shown in FIG. The converting device 2 may be placed parallel to each other or may be placed obliquely at an angle.

Further, in each of the above-mentioned embodiments, the atomizing surface of the ultrasonic atomizer 2 moves approximately linearly, but in the embodiment shown in FIG. It is configured to move. To explain this configuration, an air blower (not shown) is connected to the air passage 14 containing the ultrasonic atomizer 2 through a bendable duct 17, and a movable stage 28
Fixed on top. The moving platform 28 is configured to be freely movable while being guided by X-direction guide rails 29 and 30, and guides 31 and 32 to which the X-direction guide rails 29 and 30 are fixed are guided by Y-direction guide rails 33 and 34. It is configured so that it can be moved freely. As a result, the movable table 28 can be moved in either the x direction or the Y direction. On the other hand, the movable table 28 is provided with an arm 35, one end of which is rotatably engaged with a pin 38 fixed to a rotary arm 37 rotated by a motor 36. A liquid supply device (not shown) is connected to the ultrasonic atomization device 2 via a liquid supply vibrator 6 . To explain the operation based on the above configuration, the oscillator (not shown)
When the flux liquid is supplied to the atomization surface 7 through the liquid supply vibrator 6 from the liquid supply device, the flux liquid is atomized by the ultrasonic vibration. Together with the atomized air, it comes into contact with the printed board 13 (indicated by a two-dot chain line) located at the upper opening of the main body 21 and is applied. At this time, when the motor 36 is simultaneously driven to rotate the rotary arm 37, the arm 35 engages with the pin 38 fixed to the rotary arm 37, and the movable base 2
8 is guided by the X-direction guide rails 29, 30 and the Y-direction guide rails 33, 34, and moves in a circle on a plane. As a result, the atomization surface 7 of the ultrasonic atomization device 2 also moves in a circle to atomize the flux liquid and apply it to the printed board 13, so that the printed board 13 becomes circular as shown in FIG. It is applied in a shape. This makes it possible to uniformly apply flux to the printed board 13 over a wide area. Further, in this embodiment, the entire surface of the printed board 13 can be uniformly coated without moving the printed board 13. Furthermore, even if the size of the printed board 13 to be coated changes, the fixing position of the pin 38 can be moved along the groove 39 provided in the rotary arm 37, or the motor 36 can be moved.
By changing the rotation speed of the flux, it is possible to apply the flux liquid uniformly at all times. In the embodiment shown in FIG. 8, the entire air passage containing the ultrasonic atomizer 2 is configured to move in a circular motion, but as shown in FIG. The ultrasonic atomizer 2 may be moved in a circular motion, or only the ultrasonic atomizer 2 may be fixed to the moving table 28 and moved as shown in FIG. As described above, according to the present invention, atomized particles can always be uniformly applied regardless of the size of the object to be coated.

Furthermore, by controlling the movement of the ultrasonic atomizer using a servo motor or the like, it is possible to uniformly apply the atomized particles even to a complex-shaped object. In addition, since the atomized particles of the flux liquid do not adhere to the walls of the conveyance path unlike in the conventional example, not only are the atomized particles not wasted, but when applied to automatic soldering equipment, for example, the moving speed of the printed board can be reduced. productivity can be improved.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a conventional example, FIG. 2 is a vertical cross-sectional view of another conventional example, FIG. 3 is a vertical cross-sectional view of a liquid coating device according to an embodiment of the present invention, and FIG. 4 is an automatic In soldering equipment,
An explanatory diagram showing the traveling direction of the printed board and the flux liquid application direction, FIG. 5, FIG. 6, and FIG. 7 are longitudinal cross-sectional views showing other embodiments of the present invention, and FIG. 8 is a still another embodiment of the present invention. FIG. 9 is a partially cutaway perspective view showing the embodiment of FIG. 8, and FIG. 9 is an explanatory diagram showing the state of applying flux liquid to the printed board in the embodiment of FIG. 2... Ultrasonic atomization device, 11... Air blower, 13... Printed board (object to be coated).

Claims (1)

[Claims] 1. An ultrasonic atomizer that generates atomized particles, and a blower that supplies air that conveys the atomized particles generated by the ultrasonic atomizer to the coating surface of an object to be coated. 1. A liquid coating device comprising: a liquid coating device, wherein the ultrasonic atomization device is movably provided. 2. The liquid coating device according to claim 1, wherein the ultrasonic atomization device is configured to move linearly at a certain angle that is not parallel to the traveling direction of the object to be coated. . 3. The liquid application device according to claim 1, wherein the ultrasonic atomization device is configured to move in an arc shape. 4. The liquid coating device according to claim 1, wherein the ultrasonic atomization device is configured to move while maintaining a substantially constant distance from the object to be coated. 5. The liquid coating device according to claim 1, wherein the ultrasonic atomization device is configured to swing the other end relative to the object to be coated using a support portion at one end as a fulcrum. 6. The ultrasonic atomizer according to any one of claims 1 to 5, characterized in that the ultrasonic atomizer is provided with an adjusting means for adjusting at least one of its moving speed and moving distance. Liquid applicator.