JPH06142576A - Method and apparatus for applying highly viscous material - Google Patents

Abstract

PURPOSE:To provide a method and apparatus which can efficiently apply a given amount of a highly viscous material. CONSTITUTION:A transcription pin 5 exposed from a guide plate 4, after the end part of the pin 5 being soaked in an adhesive (highly viscous material) 2a, is pulled back from the guide plate 4 by a given distance, and the adhesive 2a exposed from the guide plate 4 is wiped away with a scraper 7. In this way, the given amount of the adhesive 2a is left on the end face of the pin 5. The pin 5 is exposed again so that the given amount of the adhesive 2a left on the end face of the pin 5 is applied on a surface to be coated. By keeping the length L, by which the pin 5 is pulled back from the end face 4b of a guide hole 4a, constant, the amount of the adhesive 2a left on the end face 5a of the pin 5 is adjusted constant. Since the given amount of the adhesive 2a can be left on the end face 5a of the pin 5 with the end face 5a of the pin 5 oriented downward, the adhesive 2a can easily be applied vertically or horizontally to the surface to be coated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating method for a highly viscous material suitable for coating a very small amount of a highly viscous material such as an adhesive or a paste, and a coating apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, a pin transfer method, a method using a dispenser, and the like are known as methods for applying a very small amount of a highly viscous material.

In the pin transfer method, the entire transfer pin is immersed in a high-viscosity material with the tip of the transfer pin facing upward, the transfer pin is lifted, and the high-viscosity material remaining on the end surface of the transfer pin is applied from below. It is a method of applying to the surface.

The system using the dispenser is a system in which the amount of application is controlled by controlling the amount of air sent into the syringe.

[0005]

However, for example, when a coil device is mass-produced by using a lead frame, the conventional pin transfer method requires coating from below, so that efficient coating work can be performed. In addition, the method using a dispenser has a drawback that a controller is required for the number of locations to be coated at the same time, and the coating apparatus becomes large.

Therefore, the present invention has been made in view of the above circumstances, and an object thereof is to provide a high-viscosity material coating method and a coating apparatus therefor capable of efficiently coating a predetermined amount of high-viscosity material. .

[0007]

In order to achieve the above object, in the coating method according to the first aspect of the present invention, the transfer pin exposed from the guide hole is immersed in a highly viscous material and then the transfer pin is immersed. By a predetermined distance from the end face of the guide hole to remove the high-viscosity material exposed from the end face of the guide hole, thereby leaving a predetermined amount of the high-viscosity material on the tip face of the transfer pin, and exposing the transfer pin again. It is characterized in that a predetermined amount of high-viscosity material remaining on the tip surface is applied to the surface to be coated.

According to a second aspect of the present invention, there is provided a coating device for coating a high-viscosity material on a surface to be coated, the guide plate having a guide hole and holding the transfer pin so that the transfer pin can be retracted from the guide hole. The scraper wipes off the high-viscosity material exposed from the end face of the guide hole.

[0009]

The operation of the coating method and the coating device having the above-mentioned construction will be described.

According to the coating method of the first aspect, the amount of the high-viscosity material remaining on the tip surface of the transfer pin becomes constant by keeping the amount of drawing of the transfer pin from the end surface of the guide hole constant. A certain amount of high-viscosity material can be left on the tip of the transfer pin with the tip of the transfer pin facing downward. It becomes easy and efficient coating is possible.

According to the coating apparatus of the second aspect, the transfer pin is exposed from the guide plate, the tip portion of the transfer pin is immersed in the high-viscosity material, and then the transfer pin is pulled from the guide plate for a predetermined distance. When the highly viscous material exposed from the end surface of the guide hole is wiped off with a scraper, a predetermined amount of the highly viscous material remains on the tip surface of the transfer pin. The transfer pin is exposed again, and a predetermined amount of high-viscosity material remaining on the tip surface of the transfer pin is applied to the surface to be coated. By keeping the amount of withdrawal of the transfer pin from the end surface of the guide hole constant, the amount of the high-viscosity material remaining on the tip surface of the transfer pin becomes constant. A certain amount of high-viscosity material can be left on the tip of the transfer pin with the tip of the transfer pin facing downward. It will be easy.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

1 to 6 are sectional views showing an embodiment of the coating method and coating apparatus of the present invention.

The coating apparatus of the present embodiment comprises a first coating apparatus 1 for coating an adhesive shown in FIGS. 1 to 6, a second coating apparatus for coating cream solder (not shown), and a UV (ultravio).
let) A third coating device (not shown) for coating the resin.

The first coating device 1 includes a container 3 containing an adhesive 2a as a highly viscous material, and a guide plate fixedly arranged at a predetermined position with respect to the container 3 and having a plurality of guide holes 4a. 4 and a plurality of transfer pins 5 in the guide hole 4a of the guide plate 4.
The holding plate 6 that holds it so that it can be retracted into and from the end surface 4 of the guide hole 4a.
a scraper 7 for wiping off the adhesive 2a exposed from b,
The holding plate 6 is moved up and down, left and right, and back and forth to move the adhesive 2
and a moving mechanism (not shown) for applying a to the surface to be coated.

Incidentally, the shapes of the transfer pin 5 and the tip surface 5a,
The size and the like may be appropriately selected according to the shape of the surface to be coated and the amount of coating, such as a square flat shape, a spherical shape, a truncated cone shape, a minus shape, a plus shape, and a concave shape. In the case shown in FIGS. 1 to 6, the transfer pin 5 is made of stainless steel and has a cross section of 1 mm ×
It is made of a 0.3 mm square rod, and the tip surface 5a is a flat surface. Further, the size of the guide hole 4a may be adjusted to the cross section of the transfer pin 5 and the transfer pin 5 may be slidable. The position of the guide hole 4a may be the position of a plurality of surfaces to be coated. It should be provided corresponding to. In the case shown in FIGS. 1 to 6, ten guide holes 4a are provided in the longitudinal direction at a pitch of 6 mm, and two guide holes 4a are provided in the front and rear rows. If the temperature change in the coating process is large, the temperature control of the container 3 can stabilize the coating amount.

The second and third coating devices are provided with the transfer pin 5
And the shape and size of the tip surface 5a, the position of the guide hole 4a, the type of high-viscosity material, and the like, and is configured similarly to the first coating apparatus 1.

Next, one embodiment of the coating method of the present invention by the coating device having the above-mentioned structure will be described with reference to the manufacturing process diagram of the coil device 10 of FIG.

First, the adhesive 2a is applied to the lead frame 12 as follows (step A).

An epoxy resin (bisphenol A type) having a viscosity of 1500 to 2000 cps, for example, is prepared in the container 3 as the adhesive 2a. Then, as shown in FIG. 1, by a moving mechanism (not shown) of the first coating apparatus 1,
The transfer pin 5 is exposed through each guide hole 4a of the guide plate 4, and the tip portion of the transfer pin 5 is immersed in the adhesive 2a in the container 3. Next, as shown in FIG. 2, the holding plate 6 is lifted upward by the moving mechanism to move the tip end surface 5a of the transfer pin 5 upward from the liquid surface of the adhesive 2a. Then, FIG.
, The transfer pin 5 is connected to the end surface 4b of the guide hole 4a.
A predetermined distance L from. Then, as shown in FIGS. 4 and 5, the adhesive 2a exposed from the end surface 4b of the guide hole 4a.
Wipe off with a scraper 7. Next, the holding plate 6 is lifted upward by the moving mechanism and the transfer pin 5 is pulled out from the guide hole 4a. Then, as shown in FIG. 2a remains. next,
As shown in FIG. 7, the holding plate 6 is moved by a moving mechanism so that a predetermined amount of the adhesive 2a remaining on the tip surface 5a of the transfer pin 5 is applied to each surface 1 to be coated 1 at a predetermined position on the lead frame 12.
Apply to 2a from above.

Next, as shown in FIG. 8, the lower surface 11a of the coil device main body 11 is attached to the adhesive 2a on the lead frame 12.
It is placed on the surface 12a coated with (step B).

After the adhesive 2a is cured while pressing the coil device main body 11 against the lead frame 12 (step C), as shown in FIG. 9, a highly viscous material having a viscosity of 2000 to 5000 cps, for example. The cream solder 2b is applied laterally to the end surface 13a of the drum core 13 by the second applying device (step D).

Subsequently, the applied cream solder 2b
Is heated and dried by a high-frequency turbo heating iron, and the end surface 13a of the drum core 13, the end portion 14a of the coil 14 and the lead terminals 12b are joined together (step E). In addition,
End surface 13 of drum core 13 coated with cream solder 2b
Similarly, after applying the cream solder to the end surface 13a facing the surface a (step D), it is dried (step E).

Next, as shown in FIG. 10, a UV resin 2c having a viscosity of 500 to 700 cps, for example, as a highly viscous material is laterally applied to the end surface 11b of the coil device body 11 by a third applying device (step). F).

Subsequently, the applied portion is irradiated with UV to be cured (step G).

The end surface 11b opposite to the end surface 11b of the coil device body 11 coated with the UV resin 2c is similarly coated with the UV resin (step F) and then irradiated with UV (step G).

Then, as shown in FIG. 11, the same UV resin 2c as that used in the step F is applied to the exposed portion of the lower surface 11a of the coil device body 11 at the center.
The coating device is used to coat from above (step H).

Subsequently, the applied portion is cured by UV irradiation (step I) and ground so as to be flush with the lead terminal 12b.

By cutting a predetermined position of the lead frame 12,
By bending the lead terminal 12b formed by the cutting toward the coil device main body 11 side (process J), the coil device 10 shown in the perspective view of FIG. 9 and the cross-sectional view of FIG. 10 is manufactured. It should be noted that the coil device body 11 includes the drum core 13
A coil 15 wound around the drum core 13 and a case 15 for accommodating the drum core 13.
It has a chip shape with a size of mm ³ .

According to the coating method and coating apparatus of the above embodiment, the following effects can be obtained.

(1) The amount of high-viscosity material (2a, 2b, 2c) remaining on the tip surface 5a of the transfer pin 5 is kept constant by keeping the amount of withdrawal from the end surface 4b of the guide hole 4a of the transfer pin 5 constant. Since it becomes constant, a certain amount of high-viscosity material (2a, 2
b, 2c) can be applied to the surface to be coated. Also,
By changing the drawing amount of the transfer pin 5, the application amount of the high-viscosity material (2a, 2b, 2c) can be arbitrarily adjusted.

(2) Since work can be easily applied to the surface to be coated from above or laterally, workability is improved. In addition, since work can be applied to a plurality of places at the same time, workability is further improved.

(3) Adhesive application (step A), cream solder application (step D), and UV resin application (step F, step) are applied in the same manner. Can be miniaturized.

(4) Since the bottom of the coil device 10 has a flat surface so that no step is formed, the coil device 10 can be easily fixed when it is mounted on a printed circuit board.

The present invention is not limited to the above embodiment,
Various modifications can be made without changing the gist of the invention.

[0036]

According to the invention of the coating method described in claim 1 described above in detail, by keeping the amount of drawing of the transfer pin from the end face of the guide hole constant, the high viscosity remaining on the tip face of the transfer pin is obtained. The amount of material becomes constant, and a certain amount of high-viscosity material can be left on the tip surface of the transfer pin with the tip surface of the transfer pin facing downward. Since the application from the lateral direction is facilitated, it is possible to provide a method for applying a high-viscosity material that can efficiently apply a predetermined amount of the high-viscosity material.

According to the invention of the coating apparatus described in claim 2,
Similarly to the first aspect, it is possible to provide a high-viscosity material coating device capable of efficiently coating a predetermined amount of high-viscosity material.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a coating method and a coating apparatus of the present invention.

FIG. 2 is a cross-sectional view showing an embodiment of the coating method and coating apparatus of the present invention.

FIG. 3 is a cross-sectional view showing an embodiment of the coating method and coating apparatus of the present invention.

FIG. 4 is a cross-sectional view showing an embodiment of the coating method and coating apparatus of the present invention.

FIG. 5 is a cross-sectional view showing an embodiment of the coating method and coating apparatus of the present invention.

FIG. 6 is a cross-sectional view showing an embodiment of the coating method and coating apparatus of the present invention.

FIG. 7 is a perspective view showing an adhesive applying step.

FIG. 8 is a perspective view showing a placing step of the coil device main body.

FIG. 9 is a plan view showing a step of applying cream solder.

FIG. 10 is a plan view showing a UV resin coating step.

FIG. 11 is a perspective view showing a UV resin coating step.

FIG. 12 is a perspective view of a coil device.

13 is a cross-sectional view of the coil device shown in FIG.

FIG. 14 is a manufacturing process diagram of the coil device shown in FIG. 12;

[Explanation of symbols]

 1 First coating device (coating device) 2a Adhesive (highly viscous material) 2b Cream solder (highly viscous material) 2c UV resin (highly viscous material) 4 Guide plate 4a Guide hole 5 Transfer pin 5a Transfer pin tip surface 6 Holding plate 7 Scraper

Claims (2)

[Claims] 1. A high-viscosity material exposed from the end surface of the guide hole by immersing the tip of the transfer pin exposed from the guide hole in the high-viscosity material, and then retracting the transfer pin from the end surface of the guide hole by a predetermined distance. By removing a predetermined amount of high-viscosity material on the tip surface of the transfer pin, exposing the transfer pin again, and applying a predetermined amount of high-viscosity material remaining on the tip surface to the coating surface. Characteristic high viscosity material application method. 2. A coating device for coating a high-viscosity material on a surface to be coated, the guide plate having a guide hole, holding a transfer pin so that the transfer pin can be retracted from the guide hole, and high viscosity exposed from an end face of the guide hole. And a scraper for wiping off the material.