JPS6171866A - Method for applying coating material for electronic parts - Google Patents

Abstract

PURPOSE:To continuously perform coating with good efficiency, by rotating the rollers arranged in coating material in two-line/two row arrangement to form the protruded flow fluxes of the coating material and supplying electronic parts to said flow flux parts. CONSTITUTION:Two pairs of rollers 40a-40d are respectively provided to two shafts 34, 36 suspended in a tank 32 so as to leave intervals therebetween. Four rollers 40a-40d are respectively rotated to the inside direction to gather the coating material 12 around the rollers in the tank 32 between the rollers 40a-40d and the flow fluxes of the coating material 12 are generated between four rollers 40a-40d. These flow flux parts are protruded from the circumference and electronic parts elements 20 are continuously supplied to said flow flux parts and the coating material 12 is contacted with the surfaces of the elements 20 in a fluidized state to perform necessary and sufficient coating.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of coating an exterior material of an electronic component, and particularly relates to a method of coating an exterior material of an electronic component, for example, in which the exterior material is applied to an electronic component having lead wires. .

(Prior Art) FIGS. 10 to 12 are illustrative views showing a conventional batch processing coating method. First, as shown in FIG. 10, an electronic component element 20 is placed on an exterior material 12 such as liquid resin stored in a tank 10. As shown in FIG. This element 20 is attached to one end of a lead wire 22, and this lead wire 22
The other end is held by a holder 23. And the 10th
Holder 23 or element 2 in the direction shown by arrow A in the figure.
0 (or raise the tank 10),
As shown in FIG. 1, the element 20 is immersed in the exterior material 12. After that, the exterior material 12 attached to the element 20
As shown in FIG. 12, in order to adjust the amount of While doing so, pull up the element 20 from the exterior material 12. ” This method has low throughput because it is a batch process.

In order to improve the processing capacity, firstly, it is possible to shorten the time for immersing the element in the exterior material and the time for sending and feeding the element. However, simply shortening the time in this way does not result in a significant reduction in the overall time since there are many steps involved. Secondly, it is conceivable to increase the number of processing steps per time. However, increasing the number of processing cycles per process not only tends to cause variations in quality, but also requires a larger tank area, resulting in a larger device.

As described above, the method using hatch processing cannot expect a significant improvement in processing capacity. Furthermore, since the element is simply immersed in the stationary sheathing material, there is a drawback that the sheathing material is difficult to adhere to the parts of the element, such as the root portions of the lead wires.

In order to eliminate such drawbacks of batch processing, the 13th
Possible methods are as shown in FIG. 14 and FIG. 1st
FIG. 3 is an illustrative view for explaining this other conventional method, and FIG. 14 is a sectional view taken along line XIV-XIV in FIG. 13. This method uses a roller 26 with a groove 28 installed in a tank 10 and a strip-shaped carrier tape 24 to which lead wires 22 to which electronic component elements 20 are attached are attached at equal intervals in the longitudinal direction. The roller 26 is rotated in the direction shown by the arrow, and its inertia causes the tank 10 to rotate.
The feed hole 2 formed in the carrier tape 24 is inserted so that the inner sheathing material 12 is attached to the rim 28 of the roller 26 and pulled up, and the element 20 passes through the rim 28 at the upper end of the roller 26.
4a, the element 20 is continuously transferred in the direction shown by arrow E in FIG.

(Problems to be Solved by the Invention) According to the conventional method using this grooved roller, continuous processing can be performed, so that the processing capacity is improved. However, even with this method, there are still problems to be solved. That is, in order to increase efficiency, if the transport speed of the element 20 is increased and the circumferential speed of the roller 26 is also increased accordingly, the relative immersion time between the element 20 and the exterior material 12 becomes extremely short, and the element 20 is The exterior material 12 cannot be sufficiently adhered to the area where the coating is formed, resulting in poor coating. This is because the sheathing material 12 cannot sufficiently flow into that part of the element 20 in a short period of time depending on the viscosity of the sheathing material 12 and the wettability of the surface of the cement 20.

In order to solve this problem, it is conceivable to vibrate the element 20 or the roller 26 using an air pie break or a magnetic vibrator to improve the flowability of the exterior material 12.
There is a limit to the flowability of the sheathing material 12 relative to the transfer speed, and it has been impossible to significantly improve processing efficiency. Furthermore, it is conceivable that by increasing the diameter of the roller 26, the immersion time of the element 20 can be lengthened even if the circumferential speed is increased, but in this case, the device becomes large.

Therefore, the main object of the present invention is to provide a method for coating exterior materials of electronic components, which can be efficiently and continuously processed without increasing the size of the apparatus.

(Means for Solving the Problems) This invention arranges four rollers in an array of two rows and two columns at a predetermined interval in an exterior material, and places these four rollers on opposite roller sides. The exterior of the electronic component is rotated toward the exterior of the electronic component to create a raised flux in the exterior material existing between these four rollers, and electronic component elements are continuously fed into the flux area. This is a method of painting wood.

(Operation) By rotating each of the four rollers inward, the sheathing material around the four rollers is collected between the rollers, and a flux of sheathing material is generated between the four rollers. This flux portion of the sheathing material is raised above the surrounding area, and by feeding the electronic component element thereto, the sheathing material comes into contact with the surface of the electronic component element in a fluid state.

(Effects of the Invention) According to the present invention, even if the relative immersion time between the element and the exterior material is relatively short, the exterior material is sufficiently adhered to all surfaces of the element, so a conventional grooved roller is used. Compared to this method, faster processing is possible. Furthermore, even if the four rollers that generate the flux of the sheathing material are not very large, they generate sufficient flow, so the device does not become large.

Furthermore, by creating a flow in the same direction as the feeding direction of the element in the raised flux part of the exterior material, the exterior material will not hit the element or lead wire with force, and the lead wire will be Exterior material is not painted due to length.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

(Embodiment) FIG. 1 is an illustrative diagram showing an embodiment of the present invention. In this embodiment, a strip-shaped carrier tape 24 is prepared in which lead wires 22 to which elements 20 of an electronic component, such as a ceramic capacitor, are attached are attached at regular intervals in the longitudinal direction. Using holes (not shown), carrier tape 24 is continuously transported in the direction indicated by arrow E in FIG. On the other hand, by creating a raised flux in the exterior material 12 as described below and passing the element 20 through the flux portion, the exterior material 12 in a fluid state is applied to the surface of the element 20.
, thereby efficiently painting the exterior material 12.

FIG. 2 is a plan view showing an example of a device for generating a flux in the exterior material. FIG. 3 is a cross-sectional view taken along the line ■--■ in FIG. 2. The device 30 includes a tank 32 with an open top, and two shafts 34 and 36 are mounted parallel to each other from one side of the tank 32 to the other. Two rollers 40a, 40b and 40c, 40d are provided at intervals on the shafts 34 and 36, respectively, and the roller 40
C and 40d correspond to rollers 40a and 40b, respectively, and rollers 40a-40d preferably include:
Their outer diameters are chosen equally.

Then, the liquid exterior material 12 is put into this tank 32, and
The three rollers 40a, 40b, 40c and 40d are rotated (inwardly) in the direction indicated by arrow F in FIG. 4, preferably at the same rotational speed. That is, each roller 40a to 4
0d are rotated so that their tops are toward the opposing rollers.

At this time, if the outer diameters of the rollers 40a to 40d are different, the rotational speed of the rollers is preferably set so that the circumferential speed of each roller is the same. This is because if the circumferential speeds of the respective rollers are different, the flux described below will not be uniform.

In this way, when the four rollers 40a to 40d are rotated in the direction shown by the arrow F in FIG.
The exterior material 12 around the rollers 40a to 40d flows as the rollers 40a to 40d rotate and is collected between the rollers 40a and 409 and between the rollers 40b and 40d. is raised above the rest level of the material 12. This collected exterior material 12 is then transferred between rollers 40a and 40b and between rollers 40c and 40.
d, and a flux of the exterior material 12 is generated. That is, the exterior material 12 is moved in the direction shown by arrow G1 between rollers 40a and 40c, in the direction shown by arrow G2 between rollers 40b and 40d, and in the direction shown by arrow H1 between rollers 40a and 40b. In addition, the fluid flows between rollers 40c and 40d in the direction shown by arrow H2. At this time, as shown in FIG. 5, the liquid level of the exterior material 12 is
6 is higher than other parts.

Then, as shown in FIG. 1, when the element 20 is passed through the raised flux of sheathing material generated in this way, that is, between the rollers 40a and 40b and between the rollers 40c and 40d. , the element is located at the confluence of the flows in the directions of arrows G1 and G2.
It flows into 0's abdomen. That is, the exterior material 12 contacts the surface of the element 20 in a fluid state. Therefore, the exterior material 12 can be sufficiently coated on all surfaces of the element 20, such as the areas between the lead wires 220 and the roots.

FIG. 7 is a plan view showing another embodiment of the invention. FIG. 8 is a sectional view taken along the line ■--■ in FIG. 7. In this embodiment, the flux of the raised sheathing material is forced in a fixed direction, and for this purpose, the device 30 includes a strip-shaped plate 50 with a square-shaped through hole 52 formed in the center thereof. . This plate 50 is arranged in a direction perpendicular to the axes 34 and 36 and such that the through hole 52 is located at the center of the rollers 40a to 40d. Furthermore, the plate 50 has one end 50a on the shaft 34 side slightly lifted from the other end 50b on the shaft 36 side, that is, the end 50b on the element transfer direction (direction of arrow E) is lower than the one end 50a. It is maintained as follows.

In this embodiment as well, similarly to the above-described embodiment, the exterior material 12 on the outer periphery is collected between the rollers 40a to 40d by the rollers 40a to 40d, causing a flow of the exterior material 12. At this time, between the rollers 40a and 40b, the sheathing material 12 flows by the plate 50 in the opposite direction to that in FIG. 4, that is, in the direction indicated by the arrow H1' in FIG. 9.

This is because the plate 50 is arranged at an angle. In addition, since the plate 50 is provided with a through hole 52, a portion of the exterior material collected between the rollers 40a to 40d returns into the tank through the through hole 52, and the plate 50 Compared to the case without it, the flow of the exterior material is not disturbed.

In this way, the feeding direction of the element 20 (direction of arrow E)
and the flow direction of the exterior material 12 in contact with it (arrow H in Figure 9).
1' and H2 directions) are forced to be the same, the sheathing material 1'2 will have a force against the element 20 and the lead wire 22, as in the case where the sheathing material 12 has a flow opposite to the direction in which the Niremen 1-20 is transferred. Because I don't often get it right,
The sheathing material 12 is not coated on the lead wire 22 for longer than necessary. As a result, the length of the "sagging" of the sheathing material 12 formed on the lead wire 22 can be shortened.

Note that although a liquid exterior material was used in the above-described embodiments, the present invention can also be applied to powdered exterior materials, and can be applied not only to ceramic capacitors but also to any electronic components such as various capacitors and resistors.

[Brief explanation of drawings]

FIG. 1 is an illustrative diagram showing an embodiment of the invention. FIG. 2 is a plan view of an example of a device for producing a raised flux. FIG. 3 is a cross-sectional view taken along the line ■--■ in FIG. 2. FIG. 4 is a plan view for explaining the flow of the exterior material by the apparatus shown in FIG. 2. FIG. 5 is a sectional view taken along line 1--2 in FIG. 4. FIG. 6 is a sectional view of a main part taken along line V[-Vl in FIG. 4. FIG. 7 is a plan view showing a modification of the device shown in FIG. 2. FIG. 8 is a sectional view taken along the line ■--■ in FIG. 7. FIG. 9 is a plan view for explaining the flow of the exterior material by the apparatus shown in FIG. 7. FIGS. 10 to 12 are illustrative views showing a conventional bunching method. FIGS. 13 and 14 are illustrative views showing a coating method using continuous processing, and FIG. 14 is a sectional view taken along line XIV-XIV in FIG. 13. In the figure, 12 is an exterior material, 20 is an element, 22 is a lead wire, 24 is a carrier tape, 32 is a tank, 34.3
6 is a shaft, 40a to 40d are rollers, 50 is a plate, 5
2 indicates a through hole. Patent applicant: Murata Rakusakusho Co., Ltd. Representative: Patent attorney Oka 1) Zen Kei (and 1 other person) Figure 1 Figure 6j 1 Figure 10 Figure 14 Figure 11

Claims (1)

[Scope of Claims] 1. Four rollers are arranged in a liquid or powdered exterior material in an array of two rows and two columns at predetermined intervals, and the four rollers are placed on opposite roller sides. To face the
Rotate to create a raised flux of the exterior material between the four rollers, and further continuously feed the electronic component element to the flux portion to coat the electronic component element with the exterior material. , a method of painting exterior materials for electronic components. 2. A plate member is provided to prevent the raised flux portion from flowing in a direction opposite to the feeding direction of the electronic component element, thereby forcing the flux in the same direction as the feeding direction of the electronic component element. A method for coating an exterior material of an electronic component according to claim 1.