JPH08124813A - Terminal electrode conductive paste coating method - Google Patents

Abstract

PURPOSE: To provide a terminal electrode conductive paste coating method with which a continuous spreading to the adjacent surface can be formed on the corner part. CONSTITUTION: A part base material 1A is inserted into the through hole of the elastic mask member 13 where a groove 13b is formed along the terminal electrode forming position of the part base material 1A, a screen 12, where an opening 12a is formed on the terminal electrode forming position and a part of the upper surface of the part base material 1A, is brought into contact with the upper surface of the part base material 1A, conductive paste 15 is fed to the screen 12, the conductive paste 15 is introduced into the groove 13b from the aperture 12a while the conductive paste 15 is being sucked from the lower part, and the conductive paste 15 is continuously spread from the side face of the part base material 1A to a part of the upper surface of the part base material 1A. Accordingly, as the conductive paste 9 can be continuously spread on the part base material ranging to a part of the upper surface adjacent to the terminal electrode forming objective surface, the surface layer electrode and the terminal electrode can be connected with sufficient superposition even when the surface layer electrode is formed on the adjacent surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for applying a conductive paste for terminal electrodes of electronic parts such as laminated composite parts having a plurality of terminal electrodes arranged in parallel.

[0002]

2. Description of the Related Art Conventionally, in an electronic component as shown in FIG. 2, for example, a laminated composite component 1, in order to connect an internal electrode 2 and a surface layer electrode 3, and the laminated composite component 1 is soldered to a mother board (component mounting board). For attachment, a plurality of strip-shaped terminal electrodes 4 arranged in parallel are formed.

The terminal electrode 4 is formed by applying a conductive paste to the end surface of the element body after firing by screen printing or the like. Further, after the terminal electrode 4 is formed, the surface layer electrode 3 is subsequently formed by screen printing.
Further, depending on the product, thereafter, a thick film resistor conductively connected to the surface layer electrode 3 is formed on the surface of the laminated composite component 1,
An electronic component such as a semiconductor may be soldered to the surface layer electrode 3.

[0004]

However, in the above-mentioned conventional method of applying the conductive paste for terminal electrodes, since the terminal electrodes 4 and the surface layer electrodes 3 are formed by screen printing, these terminals at the corners are formed. Since the overlap between the electrode 4 and the surface layer electrode 3 is small, they are not connected to each other, and the overlapping part between the terminal electrode 4 and the surface layer electrode 3 is thin, which may cause an open defect during soldering, which is high. There was a problem that reliability was not obtained.

In view of the above problems, an object of the present invention is to provide a method for applying a conductive paste for a terminal electrode, which can form a continuous wraparound to an adjacent surface at a corner portion.

[0006]

In order to achieve the above object, the present invention provides, in claim 1, a method for applying a conductive paste for a terminal electrode of an electronic component having a terminal electrode extending from an upper surface to a lower surface on a side surface. Then, the mask member in which a groove having a predetermined depth is formed along the terminal electrode formation position is pressed against the terminal electrode formation surface of the electronic component, and the terminal electrode is formed in correspondence with the terminal electrode formation position of the electronic component. A screen in which an opening is formed in the formation position and a part of the upper surface of the electronic component is applied to the upper surface of the electronic component, a conductive paste is supplied onto the screen, and the conductive paste is applied through the opening to the groove. A method of applying a conductive paste for a terminal electrode, which is introduced into the inside of the electronic component and continuously applied from the side surface to a part of the upper surface of the electronic component, is proposed.

According to a second aspect of the present invention, there is provided a method of applying a conductive paste for a terminal electrode of an electronic component having a terminal electrode extending from an upper surface to a lower surface on a side surface, the groove having a predetermined depth along the terminal electrode forming position. The mask member on which is formed is pressed against the terminal electrode formation surface of the electronic component, a conductive paste is injected by a drawing nozzle onto the terminal electrode formation position of the electronic component, and the conductive paste is introduced into the groove. Then, a method of applying the conductive paste for the terminal electrode is proposed, in which the conductive paste is continuously applied from the side surface to a part of the upper surface of the electronic component.

A third aspect of the present invention proposes a method for applying the conductive paste for a terminal electrode according to the first or second aspect, wherein the mask member is made of an elastic material and is used for the conductive paste for a terminal electrode.

According to a fourth aspect of the present invention, in the method of applying the conductive paste for a terminal electrode according to the first or second aspect, the conductive paste is introduced into the groove from the opening by sucking from below the electronic component. We propose a method for applying a conductive paste for terminal electrodes.

According to a fifth aspect of the present invention, in the method for applying the conductive paste for a terminal electrode according to the first or second aspect, a breathable sheet covering at least a predetermined area centered on the groove is provided on the lower surface of the electronic component. A method for applying a conductive paste for a terminal electrode, which introduces the conductive paste into the groove in a pressed state, is proposed.

[0011]

According to the first aspect of the present invention, the mask member in which the groove having the predetermined depth is formed along the terminal electrode forming position of the electronic component is pressed against the terminal electrode forming surface of the electronic component, and Corresponding to the terminal electrode formation position of the electronic component, a screen having an opening formed in the terminal electrode formation position and a part of the upper surface of the electronic component is applied to the upper surface of the electronic component, and in this state, on the screen. A conductive paste is supplied, and the conductive paste is introduced into the groove through the opening. As a result, the portions other than the terminal electrode forming positions are masked by the mask member and the screen, and the conductive paste is applied in a predetermined shape continuously from the side surface to a part of the upper surface of the electronic component.

According to a second aspect of the present invention, a mask member having a groove having a predetermined depth formed along the terminal electrode forming position of the electronic component is pressed against the terminal electrode forming surface of the electronic component,
In this state, the conductive paste is injected onto the terminal electrode formation position of the electronic component by the drawing nozzle, and the conductive paste is introduced into the groove. As a result, the portions other than the terminal electrode formation positions are masked by the mask member, and the conductive paste is continuously applied in a predetermined shape from the side surface to a part of the upper surface of the electronic component.

According to the third aspect, since the mask member is made of an elastic body, the mask member and the electronic component can be brought into close contact with each other.

According to the fourth aspect, the conductive paste is introduced into the groove from the opening by sucking from below the electronic component.

According to a fifth aspect of the present invention, the conductive paste is introduced into the groove with the breathable sheet pressed against the lower surface of the electronic component. This suppresses injection of the conductive paste from the lower end of the groove,
By attaching the conductive paste to the breathable sheet, the conductive paste is also applied to a part of the lower surface of the electronic component adjacent to the lower end of the groove.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing a laminated composite component in which a terminal electrode is formed in this embodiment. In the figure, the same components as those of the above-described conventional example are denoted by the same reference numerals. That is, reference numeral 1 denotes a laminated composite component (hereinafter referred to as component), which is arranged in parallel for connecting the internal electrode 2 and the surface electrode 3 and for soldering the component 1 to a motherboard (component mounting board). The strip-shaped terminal electrode 5 is formed.

The terminal electrode 5 is formed in a substantially U-shaped cross section from the side surface of the component 1 to the upper surface and the lower surface thereof, and is electrically connected to the surface electrode 3 with sufficient overlap on the upper surface.

Therefore, since the terminal electrodes 5 and the surface layer electrodes 3 are sufficiently overlapped at the corners, they are not connected to each other, and the overlapping portion between the terminal electrodes 5 and the surface layer electrodes 3 is different from the conventional case. Since it is thin, open defects do not occur during soldering, and high reliability is obtained.

The method of forming the terminal electrode 5 of the component 1 described above is performed by applying a conductive paste for a terminal electrode by the method described below and then curing the conductive paste.

That is, as shown in FIGS. 3 and 4, the method of applying the conductive paste for the terminal electrode in the first embodiment is a method of forming a component element body 1A in which the terminal electrode 5 and the surface layer electrode 3 are not formed. The screen is held by the holder 11 and the screen 12 is applied to the upper surface. At this time, the component body 1
The upper surface of A is held so as to match the upper surface of the component holder 11.

As shown in FIGS. 3 to 5, the component holder 11 comprises an elastic mask member 13 made of an elastic material such as silicon resin and a rigid body 14 surrounding the elastic mask member 13. Through hole 13a into which the component body 1A is fitted
And a groove 13b having a predetermined depth is formed on the side surface of the through hole 13a along the terminal electrode formation position on the side surface of the component body 1A. Further, the elastic mask member 13 and the rigid body 14 are formed with uneven portions so that they are fitted to each other so that the elastic mask member 13 does not come off from the rigid body 14. In addition, the screen 12 has an opening 12a that is formed at the terminal electrode formation position and a part of the upper surface of the component body 1A.
Are formed.

As described above, with the component body 1A held by the component holder 11, the screen 12 is applied to the upper surface thereof, and the conductive paste for the terminal electrode is applied in the step shown in FIG. That is, when the component element body 1A is fitted into the through hole 13a of the elastic mask member 13, the elasticity of the elastic mask member 13 causes the elastic mask member 13 to adhere to the side surface of the component element body 1A, leaving a gap only in the groove 13b. You can In this state,
The screen 12 is arranged so that the openings 12a are formed on the upper surfaces of the terminal electrode formation positions and a part of the upper surface of the component body 1A ((a) of FIG. 6).

Next, the conductive paste 15 is supplied onto the screen 12, and the conductive paste 15 is supplied to the portion of the opening 12a by the squeegee 16 while sucking from below the component holder 11 with a vacuum pump or the like (FIG. 6
(B)).

As a result, the conductive paste 15 is introduced from the opening 12a into the groove 13b ((c) of FIG. 6), and the side surface (terminal electrode forming surface) to the upper surface (surface layer electrode forming surface) of the component body 1A. The conductive paste 15 is continuously applied to a part thereof, and a continuous wraparound can be formed from the side surface to the upper surface in the corner of the component body 1A ((d) of FIG. 6).

Thereafter, the component body 1A is turned over and the same coating process as described above is performed, so that the conductive paste is continuously applied to the lower surface of the component body 1A from the side. Next, the surface layer electrode 3 is formed on the upper surface or the lower surface of the component body 1A by screen printing or the like to complete the component 1 shown in FIG.

Therefore, even when the surface layer electrode 3 is formed on the upper surface or the lower surface, the surface layer electrode 3 and the terminal electrode 5 can be connected with a sufficient overlap. As a result, it is possible to prevent the occurrence of an open defect between the terminal electrode 5 and the surface layer electrode 3 during soldering, and it is possible to obtain high reliability.

For the elastic mask member 13, it is preferable to select a material to which the conductive paste 15 is unlikely to adhere. For example, when the conductive paste 15 is oily, by using the elastic mask member 13 made of a hydrophilic resin, the conductive paste 15 does not adhere to the elastic mask member 13 and the application work can be performed well.

Also, after the above-mentioned coating process is completed, the component body 1A is turned over and the same coating process is carried out to form a terminal electrode that also wraps around the back surface of the component body 1A.

Next, a method of applying the conductive paste for terminal electrodes in the second embodiment of the present invention will be described. In the second embodiment, in addition to the configuration of the first embodiment described above, a mesh screen 17 with good air permeability is arranged below the component holder 11 as shown in FIG.

As described above, the conductive paste for the terminal electrodes is applied in the step shown in FIG. 8 with the mesh screen 17 arranged under the component holder 11. That is, the component element body 1A is fitted into the through hole 13a of the elastic mask member 13, the elastic mask member 13 is brought into close contact with the side surface of the component element body 1A, and a gap is formed only in the groove 13b. In this state, the screen 12 is arranged so that the openings 12a are formed on the upper surfaces of the terminal electrode formation positions and a part of the upper surface of the component body 1A ((a) of FIG. 8).

Next, the conductive paste 15 is supplied onto the screen 12, and is sucked from below the component holder 11 by a vacuum pump or the like, while the squeegee 16 supplies the conductive paste 15 to the opening 12a (FIG. 8
(B)).

As a result, the conductive paste 15 is introduced into the groove 13b from the opening 12a ((c) of FIG. 8), and the groove 1
The conductive paste 15 injected from the lower end of 3b is prevented from scattering by the mesh screen 17, and the component body 1A
Since the conductive paste 15 flows between the elastic mask member 13 and the mesh screen 17, the component body 1A
From the side surface (terminal electrode forming surface) to a part of the upper surface and the lower surface (surface layer electrode forming surface), the conductive paste 15 is continuously applied, and the component body 1A is continuously applied from the side surface to the upper surface and the lower surface at the corner portion. A wraparound can be formed (Fig. 8
(D)).

After that, a surface layer electrode is formed on the upper surface or the lower surface of the component body 1A by screen printing or the like to complete the component 1 shown in FIG.

Next, a method of applying the conductive paste for terminal electrodes in the third embodiment of the present invention will be described. In the third embodiment, instead of the squeegee 16 of the second embodiment, FIG.
Conductive paste 1 using the drawing nozzle 18 as shown in FIG.
5 was supplied.

As described above, when the conductive paste is supplied by using the drawing nozzle 18 and the conductive paste 15 for the terminal electrode is applied, first, the component element body 1A is inserted into the through hole 13a of the elastic mask member 13. The elastic mask member 13 is brought into close contact with the side surface of the component body 1A so that a gap is formed only in the groove 13b. In this state, the openings 12a are formed on the upper surfaces of the terminal electrode forming positions and the component body 1.
The screen 12 is arranged so as to cover a part of the upper surface of A ((a) of FIG. 9).

Next, the conductive paste 15 is supplied from the drawing nozzle 18 onto the opening 12a of the screen 12 while sucking from below the component holder 11 with a vacuum pump or the like ((b) of FIG. 9).

As a result, the conductive paste 15 is introduced from the opening 12a into the groove 13b (FIG. 9 (c)), and the groove 1
The conductive paste 15 injected from the lower end of 3b is prevented from scattering by the mesh screen 17, and the component body 1A
Since the conductive paste 15 flows between the elastic mask member 13 and the mesh screen 17, the component body 1A
From the side surface (terminal electrode forming surface) to a part of the upper surface and the lower surface (surface layer electrode forming surface), the conductive paste 15 is continuously applied, and the component body 1A is continuously applied from the side surface to the upper surface and the lower surface at the corner portion. A wraparound can be formed (Fig. 9
(D)).

After that, the surface layer electrodes are formed on the upper surface or the lower surface of the component body 1A by screen printing or the like to complete the component 1 shown in FIG.

In the first to third embodiments described above, the conductive paste for terminals is applied by using the component holder 11 which holds only one component element body 1A. As shown in FIG. It goes without saying that the work efficiency can be improved by using the component holder 19 capable of holding the plurality of component bodies 1A in a matrix.

[0040]

As described above, according to the first aspect of the present invention, the conductive paste is continuously applied to a part of the surface adjacent to the surface on which the terminal electrode is formed, and the electronic component has a corner portion. In, the continuous wraparound can be formed to the adjacent surface, and even when the surface layer electrode is formed on the adjacent surface, the surface layer electrode and the terminal electrode can be connected with sufficient overlap. As a result, it is possible to prevent the occurrence of an open defect between the terminal electrode and the surface electrode during soldering, and it is possible to obtain high reliability.

According to the second aspect, the conductive paste is continuously applied to a part of the surface adjacent to the surface where the terminal electrode is formed, and the electronic component is continuously wrapped around the adjacent surface at the corner portion. Can be formed, and even when the surface layer electrode is formed on the adjacent surface, the surface layer electrode and the terminal electrode can be connected with a sufficient overlap. As a result, it is possible to prevent the occurrence of an open defect between the terminal electrode and the surface electrode during soldering, and it is possible to obtain high reliability.

According to the third aspect, in addition to the above effect, the mask member is made of an elastic body, and the mask member and the electronic component can be brought into close contact with each other. The conductive paste can be applied to a desired terminal electrode shape without the conductive paste entering into the parts.

Further, according to claim 4, in addition to the above effect, since the conductive paste is introduced into the groove from the opening of the screen by sucking from below the electronic component, the conductive paste is introduced into the groove. The conductive paste can be easily introduced.

According to the fifth aspect, in addition to the above effects, the ejection of the conductive paste from the lower end of the groove is suppressed, and the conductive paste is attached to the breathable sheet, whereby Since the conductive paste is also applied to a part of the lower surface of the electronic component adjacent to the lower end of the groove, the conductive paste for the terminal electrode can be simultaneously applied to the lower surface of the electronic component, which simplifies the working process. it can.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a laminated composite component in which a terminal electrode is formed in an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a laminated composite component of a conventional example.

FIG. 3 is a diagram illustrating a method for applying a conductive paste for terminal electrodes according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating a method for applying a conductive paste for terminal electrodes according to the first embodiment of the present invention.

FIG. 5 is a side sectional view showing a component holder according to the first embodiment of the present invention.

FIG. 6 is a diagram illustrating a step of applying a conductive paste for terminal electrodes in the first embodiment of the present invention.

FIG. 7 is a diagram illustrating a method for applying a conductive paste for terminal electrodes according to a second embodiment of the present invention.

FIG. 8 is a diagram illustrating a step of applying a conductive paste for terminal electrodes in the second embodiment of the present invention.

FIG. 9 is a diagram illustrating a step of applying a conductive paste for a terminal electrode according to a third embodiment of the present invention.

FIG. 10 is a configuration diagram showing another example of the component holder in one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Laminated composite component, 1A ... Component element body, 2 ... Internal electrode, 3
... Surface layer electrodes, 4, 5 ... Terminal electrodes, 11 ... Component holder, 1
2 ... Screen, 12a ... Opening, 13 ... Elastic mask member, 13a ... Through hole, 13b ... Groove, 14 ... Rigid body, 15 ...
Conductive paste, 16 ... Squeegee, 17 ... Mesh screen, 18 ... Drawing nozzle, 19 ... Component holder.

Claims (5)

[Claims] 1. A method of applying a conductive paste for a terminal electrode of an electronic component, which has a terminal electrode extending from an upper surface to a lower surface on a side surface, wherein a mask having a groove of a predetermined depth is formed along the terminal electrode forming position. The member is pressed against the terminal electrode forming surface of the electronic component, and a screen in which an opening is formed corresponding to the terminal electrode forming position of the electronic component and the terminal electrode forming position and a part of the upper surface of the electronic component is formed. The conductive paste is applied to the upper surface of the electronic component, the conductive paste is supplied onto the screen, the conductive paste is introduced into the groove through the opening, and conductive is continuously applied from the side surface of the electronic component to a part of the upper surface. A method for applying a conductive paste for terminal electrodes, which comprises applying a conductive paste. 2. A method of applying a conductive paste for a terminal electrode of an electronic component, which has a terminal electrode extending from an upper surface to a lower surface on a side surface, wherein a mask having a groove of a predetermined depth is formed along the terminal electrode forming position. The member is pressed against the terminal electrode formation surface of the electronic component, a conductive paste is injected by a drawing nozzle onto the terminal electrode formation position of the electronic component, and the conductive paste is introduced into the groove, the electronic component A method for applying a conductive paste for terminal electrodes, characterized in that the conductive paste is applied continuously from the side surface to a part of the upper surface. 3. The method for applying a conductive paste for a terminal electrode according to claim 1, wherein the mask member is made of an elastic material. 4. The method for applying a conductive paste for a terminal electrode according to claim 1, wherein the conductive paste is introduced into the groove from the opening by sucking from below the electronic component. 5. The conductive paste is introduced into the groove while a breathable sheet covering at least a predetermined area centering on the groove is pressed against the lower surface of the electronic component. 1. A method for applying the conductive paste for a terminal electrode according to 1 or 2.