JP2967218B2 - Coating method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating method and an apparatus for applying a paint (for example, an exterior resin) to an electronic component.

[0002]

2. Description of the Related Art As one method of applying a paint to an electronic component, a so-called immersion method is known in which the electronic component is immersed in a molten paint to adhere the paint to the surface of the component.
However, in the case of the immersion method, there is a problem that a pool of paint is formed under the electronic component, and it is difficult to form a coating film having a uniform thickness.

As a countermeasure, a spray method or a brush coating method has been adopted as required. Spray method is a method of spraying molten paint in the form of mist and spraying it on the surface of electronic components,
In the case of an electronic component having an uneven surface, it is necessary to spray from multiple directions, and there is a problem that a large work place is required. On the other hand, the brush coating method requires a plurality of recoatings, and has the problem that a skilled worker cannot form a coating film having a uniform thickness.

Further, as another application method, there is a method in which a molten paint is adhered to a cloth-like or rubber-like member and an electronic component is pressed against the molten paint to transfer the paint. However, in this method, the surface has irregularities. It cannot be applied to electronic components and cannot be used for paints having a high melting point (for example, thermoplastic resins). Accordingly, an object of the present invention is to provide a coating method and a coating apparatus capable of stably forming a coating film having a uniform thickness regardless of the shape of an electronic component.

[0005]

In order to solve the above-mentioned problems, a coating method according to the present invention comprises a step of dipping an electronic component in a molten paint, and a step of dipping the electronic component in a surface of the electronic component.
The charge flows toward the bottom of the electronic component under its own weight,
The method is characterized by comprising a step of forming a pool of molten paint at the lower part of the child component and a step of removing excess paint by accelerating the electronic component to which the molten paint has adhered in a substantially oblique direction . Further, the coating apparatus according to the present invention, a coating container for containing the molten paint, dipping the electronic component into the molten paint put in the coating container, pull up, adhere to the surface of the electronic component
Molten paint flows toward the bottom of electronic components by its own weight
An electronic component supporting portion that removes excess paint by causing the electronic component to which the molten paint adheres to accelerate in substantially a diagonal direction by forming a pool of molten paint at the lower portion of the electronic component. Features. The electronic component support, for example,
A ring rod that makes an arc movement around the axis provided at one end
Have.

The electronic component immersed in the molten paint is pulled up with the paint adhered to the surface. The molten paint flows toward the lower part of the electronic component by its own weight, and the paint accumulates at the lower part of the electronic component. When the electronic component is caused to accelerate, the pool of paint is shaken off, and excess paint is removed. As a result, a coating film having a uniform thickness is formed.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a coating method according to the present invention; [First Embodiment, FIGS. 1 to 3] As shown in FIG. 1, the coating apparatus generally includes a coating container 1 and an electronic component supporting portion 4 located above the coating container 1. . The electronic component supporting part 4 includes a rail 5 inclined upward to the left at an angle θ, a slider 9 reciprocally movable within a range regulated by a cylinder 8 along the rail 5, and a mounting base 10 fixed to the slider 9. Consists of The electronic component support 4 is movable in the vertical direction.

[0008] Using the coating apparatus having the above configuration,
A method for applying the molten paint 15 to the electronic component 20 will be described. FIG. 1 shows a state in which the electronic component support 4 is set at the standby position. The coating container 1 is filled with the molten paint 15. Chucking the electronic component 20 to the mounting table 10;
After being temporarily fixed by means such as suction or adhesion, the support portion 4
Is lowered until the electronic component 20 is immersed in the molten paint 15 (see FIG. 2). Next, the support portion 4 is pulled up to its original position (see FIG. 3). The molten paint 1 is applied to the surface of the electronic component 20.
5, the paint 15 flows toward the lower part of the electronic component 20 by its own weight, and the molten paint 1
There are 5 pools. By driving the cylinder 8, the slider 9, the mounting table 10 and the electronic component 20 move to the upper left within a short time at an inclination of the angle θ, and stop at the positions 9 ′, 10 ′, and 20 ′ indicated by dashed lines. . At this time, the slider 9, the mounting table 10, and the electronic component 20 perform an acceleration motion, and the excess molten paint 15 ′ accumulated at the lower portion of the electronic component 20 is shaken off. The molten coating material 15 ′ that has been shaken off is collected in the coating container 1. Thus, the molten paint 15 having a thin and uniform thickness is formed on the surface of the electronic component 20 temporarily fixed to the mounting table 10. In an experiment performed by the present inventors, the height was 5 mm, the width was 5 mm,
If the electronic component 20 has a height of 5 mm, the angle θ is 40
(4) The extra paint 15 'was able to be shaken off under the condition that the acceleration was about 50 m / sec ² . The shaking-off condition is to be changed depending on the viscosity of the paint at the time of shaking-off and the size and shape of the electronic component.
゜ 45 °, and the acceleration is almost covered by setting the conditions within the range of about 10-100 m / sec ² .

When the swing-off operation is completed, the cylinder 8 returns to its original state, and the slider 9 and the like also return to their original positions. Thereafter, the molten paint 1 adhered to the electronic component 20
5 is cured to form a coating film having a uniform thickness. [Second embodiment, FIG. 4] The coating apparatus shown in FIG. 4 is generally composed of a coating container 1 and an electronic component supporting portion 29 located above the coating container 1. The electronic component support 4 is
A base 30, link rods 31 and 32 that make an arc movement about the shafts 31a and 32a on the base 30, and are rotatably mounted on the other ends of the link rods 31 and 32 about the shafts 31b and 32b. And a mounting base 34. As shown in the figure, the link rods 31 and 32 are in a standby state in a state of being inclined by the angle θ. The electronic component support 29 is
It can move up and down. The support part 29 includes the electronic component 20.
Descends until it is immersed in the molten paint 15, and then returns to its original position. Next, the link rods 31, 32 are forcibly moved in an arc around the shafts 31a, 32a, and stopped at the position indicated by the dashed line. As a result, the electronic component 20 performs an acceleration motion, so that the molten paint that has excessively adhered to the lower portion of the electronic component 20 is shaken off. In this manner, the electronic component 20 temporarily fixed to the mounting table 34 has a thin and uniform thickness of the molten paint formed on the surface thereof.

[Other Embodiments] The coating method and apparatus according to the present invention are not limited to the above-described embodiment.
Various changes can be made within the scope of the gist. When the electronic component is immersed in the molten paint, a part of the electronic component may be masked with a mask material, or only a part of the electronic component may be immersed.

Further, using the coating apparatus of the first embodiment,
A method is also possible in which the slider 9 is naturally or forcibly dropped from the left side of the rail 5 and collides with a stopper newly provided on the right side of the rail to remove excess paint.

[0012]

As is apparent from the above description, according to the present invention, since the excess paint is removed by accelerating the electronic component to which the molten paint has adhered, the uniformity can be obtained regardless of the shape of the electronic component. A coating film having an appropriate thickness can be formed stably. This method can handle coating materials having a low to high melting point. Therefore, it is possible to cope with high melting point wax application, solder coating, and the like.

Further, a coating film having a large film thickness can be formed by repeatedly applying and repeatedly coating.
In addition, since the surplus paint that has been shaken off can be collected, there is no loss of paint and it is economical. Furthermore, a thin and uniform coating film can be obtained simply by free-falling the electronic component to which the molten paint has adhered, so that simple and compact equipment is required. It is also a method suitable for mass production.

[Brief description of the drawings]

FIG. 1 is a partial vertical sectional view showing a first embodiment of a coating method and apparatus according to the present invention in the order of steps.

FIG. 2 is a partial vertical sectional view showing a first embodiment of the coating method and the coating apparatus according to the present invention in the order of steps.

FIG. 3 is a partial vertical sectional view showing the first embodiment of the coating method and the coating apparatus according to the present invention in the order of steps.

FIG. 4 is a partial vertical sectional view showing a second embodiment of the coating method and apparatus according to the present invention in the order of steps.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Coating container 4 ... Electronic component support part 5 ... Rail 8 ... Cylinder 9 ... Slider 10 ... Mounting stand 15, 15 '... Molten paint 20 ... Electronic component 29 ... Electronic component support part 30 ... Base 31, 32 ... Link rod 34 ... Mounting table

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification symbol FI H01G 13/00 321 H01G 13/00 321F (56) References JP-A-2-86868 (JP, A) Japanese Utility Model Application No. Sho 57-94903 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01C 1 / 02,17 / 02 B05C 3/09 B05D 1 / 18,3 / 00 H01F 41/12 H01G 13/00 321

Claims (3)

(57) [Claims] A step of immersing the electronic component in the molten paint; and a step of removing the molten paint attached to the surface of the electronic component by its own weight.
Flow toward the bottom of the component and apply
A method of forming a pool of material, and a step of removing excess paint by accelerating the electronic component to which the molten paint has adhered in a substantially oblique direction . 2. A coating container for containing the molten paint, and an electronic component is immersed in the molten paint placed in the coating container and pulled up, and the molten paint adhered to the surface of the electronic component is removed by its own weight.
To the lower part of the electronic component.
An electronic component supporting part for removing excess paint by accelerating the electronic component to which the molten paint adheres in a substantially diagonal direction by forming a pool of the molten paint in the coating device. . (3) A shaft provided at one end of the electronic component supporting portion;
Have a ring rod that makes an arc movement around the center
The coating apparatus according to claim 2, wherein: