JPH0536578A - Method and apparatus for formation of electrode on side face of substrate - Google Patents

Abstract

PURPOSE:To make an electrode paste creep to the surface side and the rear side of a substrate when an electrode is formed on a side face at the substrate and to form electrodes also on the surface side and the rear side of said substrate. CONSTITUTION:In the formation method, of an electrode on a side face at a substrate, wherein a linear electrode is formed on the side face 14a at the substrate 14 provided with the surface and the rear, one or two or more filaments 1 to which an electrode paste has been applied are stretched and installed so as to face the side face 14a at the substrate 14, the filaments 1 are brought into pressure-contact with the surface 14b and the rear 14c near the side face at the substrate 14 by means of one pair of pressure members 10, 12, and the electrode paste is made to creep to and transferred on the surface and the rear 14b, 14c at the substrate 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate side electrode forming method and apparatus for forming electrodes on the substrate side face of a surface mount type component (hereinafter referred to as SMD) which can be mounted on the surface of a circuit board. .

[0002]

2. Description of the Related Art In a chip type SMD, one or more linear electrodes 18 are provided on a side surface 17 of a substrate 17 as shown in FIG.
What is formed in a is known. The side electrode 18
Is used to connect between signal lines formed on the front and back surfaces of the board 17, or used as a soldering land for mounting.

Conventionally, the side electrode 18 of the SMD is formed by stacking a plurality of SMD substrates 17 to form a block 19 of the substrate as shown in FIG. The side surface 19a is screen-printed.

That is, the electrode paste is applied to the upper surface side of the printing screen 20 having the vertical stripe pattern 21 formed by arranging a plurality of lines having a predetermined width in parallel at a predetermined interval.
A squeegee made of an elastic material (not shown) is attached to the screen 20.
The vertical stripe pattern 2 is moved by rubbing the upper surface side of the
The electrode paste corresponding to No. 1 is transferred to the block side surface 19a of the block 19.

[0005]

In the conventional electrode forming method on the side surface of the substrate, since the electrode paste is screen-printed on the side surface 17a of the substrate 17, it is difficult to wrap the electrode paste to the front and back surfaces of the substrate 17. Is. In particular, it is difficult to increase the wraparound size of the electrodes 18a formed on the front and back surfaces of the substrate 17 (see FIG. 5). Therefore, the connection between the signal lines formed on the front and back surfaces of the board 17 may become poor, or the solder attachment area as the soldering land for the SMD mount cannot be sufficiently secured, resulting in insufficient soldering strength of the SMD. Become.

Further, as a means for causing the electrode paste to wrap around to the front and back sides of the substrate 17, for example, it is conceivable to increase the supply amount of the electrode paste at the time of screen printing, but in such a case, bleeding of the electrode paste occurs, Another problem may occur that the line width of the side surface electrode 18 becomes larger than a predetermined dimension.

Further, since the screen 20 for screen printing has to be prepared according to the pattern of the side electrode 18, the manufacturing cost becomes high in a small quantity and a large variety of SMDs.

The present invention has been made in view of the above problems, and provides a method and an apparatus for forming an electrode on a side surface of a substrate, which allows an electrode paste to sufficiently wrap around the front and back surfaces of the substrate when forming an electrode on the side surface of the substrate. The purpose is to provide.

[0009]

The present invention provides a method of forming a linear electrode on a side surface of a substrate having front and back surfaces, in which an electrode paste is attached to form one or more linear stripes. After being stretched to face the side surface of the substrate, the linear member is pressed by at least one side surface of the front and back surfaces of the substrate by a pressing member so that the linear member wraps around the pressed surface of the substrate surface. The electrode paste is transferred onto the side surface of the substrate and at least one of the front and back surfaces (claim 1).

Further, according to the present invention, in a method of forming a linear electrode on a side surface of a substrate having front and back surfaces, a strip-shaped electrode having one or more linear electrode pastes applied on one surface is formed. The electrode paste transfer member is stretched so that the application surface of the electrode paste faces the side surface of the substrate, and the pressing member presses the electrode paste transfer member on at least one side surface of the front and back surfaces of the substrate. The electrode paste transfer member is wrapped around the pressed surface of the substrate surface to transfer the linear electrode paste onto the side surface and at least one of the front and back surfaces of the substrate (claim 2). ).

The pressing member may be composed of a rotatable roller or a plate material having a tapered cross section (claims 3 and 4).

Further, the present invention is an electrode forming apparatus for forming a linear electrode on a side surface of a substrate having front and back surfaces, and an electrode paste attaching means for attaching an electrode paste to one or more linear lines. A filament tensioning means for tensioning the filament to which the electrode paste is attached so as to face the side surface of the substrate, and the filament by pressing the filament on at least one side surface of the front and back surfaces of the substrate. And a pressing means for wrapping around the pressed surface to the substrate surface side, and at least one of the side surface of the substrate and the front and back surfaces of the electrode paste attached to the linear wire by pressing the linear wire by the pressing means. It is adapted to be transferred to the surface (claim 5).

Further, according to the present invention, in an electrode forming apparatus for forming a linear electrode on a side surface of a substrate having front and back surfaces, a strip-shaped electrode paste transfer means for applying an electrode paste on one side, and the electrode. Electrode paste applying means for applying an electrode paste to one or more linear lines on the paste transferring means, and tensioning means for tensioning the electrode paste transferring means coated with the electrode paste so as to face the side surface of the substrate. A pressing means for wrapping the electrode paste transfer means around the pressed surface of the substrate by pressing the electrode paste transfer means on at least one side surface of the front and back surfaces of the substrate. By pressing the paste transfer means, the linear electrode paste applied to the electrode paste transfer means is applied to at least the side surface and front and back surfaces of the substrate. It is obtained so as to be transferred to the one surface (Claim 6).

The pressing member may be composed of a rotatable roller or a plate member having a tapered cross section (claims 7 and 8).

[0015]

According to the invention of claims 1 and 5, 1 or 2
The electrode paste is attached to the above-mentioned wire, and the wire is stretched so as to face the side surface of the substrate. The linear member is pressed by at least one of the front and back surfaces of the substrate by the pressing member.

As a result, the linear strip is pressed against the side surface of the substrate with a predetermined pressure, and also wraps around the pressed side of the front and back surfaces near the side surface to be pressed into contact, so that the electrode paste adhered to the linear strip of the substrate. Transferred to the pressed side of the side and front and back,
A linear electrode is formed.

According to the third aspect of the present invention, the roller pressing the filament rotates, and the filament is pressed against the substrate with a uniform pressure without rubbing the peripheral surface of the roller.

According to the fourth aspect of the present invention, the leading edge portion of the plate material having a tapered cross section is in contact with each line,
The filament is pressed against the substrate.

According to the second and sixth aspects of the invention, one or more linear electrode pastes are applied to one surface of the strip-shaped electrode paste transfer member, and the electrode paste transfer member is made to face the side surface of the substrate. The pattern of linear electrodes to be formed on the side surface of the substrate is formed by stretching the substrate.

The electrode paste transfer member is pressed by at least one of the front and back surfaces of the substrate by the pressing member. Thereby, the electrode paste transfer member is
The linear electrode paste applied to the electrode paste transfer member is pressed against the side surface of the substrate with a predetermined pressure, and wraps around the pressed side of the front and back surfaces near the side surface to apply pressure to the side surface and the front and back surfaces of the substrate. Is transferred to the pressed side of the to form a linear electrode.

According to the invention of claim 7, the roller for pressing the electrode paste transfer member rotates, and the electrode paste transfer member is pressed against the substrate with a uniform pressure without rubbing the peripheral surface of the roller. .

According to the eighth aspect of the present invention, the tip edge portion of the plate material having a tapered cross section contacts the electrode paste transfer member, and the electrode paste transfer member is pressed against the substrate.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view of essential parts showing a structure for carrying out a method for forming electrodes on a side surface of a substrate according to the present invention.

In the figure, 1 is a line for forming a linear electrode. The filament 1 is made of resin or metal wire, and the number of the filaments 1 is set according to the electrode pattern to be formed. Further, each line 1 has a wire diameter corresponding to the line width of the electrode to be formed. Also, the distance D between each line 1
Are set at appropriate intervals according to the electrode pattern to be formed.

The line 1 is moved by a predetermined distance L in the horizontal direction (direction A in the drawing) by a drive roller (not shown) every time an electrode is formed. This line 1
The movement of is performed by winding the finite length of the wire 1 by the drive roller or by rotating the infinite end wire 1 by the drive roller.

Numerals 2 to 5 are guide rollers for tensioning the filament 1 in parallel at a predetermined interval D and guiding the movement of the filament 1 and rotating to side plates (not shown). Supported as possible. Further, 6 and 7 are rotatable between the guide rollers 2 and 3 and between the guide rollers 4 and 5, respectively.
In addition, the cushioning roller is arranged so as to be vertically swingable.

Reference numeral 8 is an electrode paste attaching device for attaching the electrode paste to the filament 1. The electrode paste attaching device 8 is for ejecting the electrode paste by, for example, an ejection nozzle to attach the electrode paste to each filament 1. The filament 1 may be dipped in the electrode paste to attach the electrode paste.

Reference numeral 9 denotes an electrode paste removing device for removing the electrode paste remaining on the filament 1 after forming the electrodes on the substrate 14. The wire paste 1 is wiped and removed by the electrode paste remaining while passing through the electrode paste removing device 9. The electrode paste removing device 9 is not essential.

Numerals 10 and 12 are a pair of rollers (pressing members) for pressing the filament 1 against the side surface of the substrate 14 and the front and back surfaces thereof. The roller 10 and the roller 12 are arranged above the linear member 1 and on the upstream side (front surface 14b side) and downstream side (rear surface 14c side) of the substrate 14 so as to be vertically movable.
1 and 13, respectively.

Further, the rollers 10 and 12 are the arms 1
It is rotatably supported by 1 and 13 so that the roller peripheral surface does not rub the wire 1 when it moves while being pressed against the wire 1. Therefore, the pressing force of the rollers 10 and 12 is uniformly applied to each filament 1. In addition, the roller 10,
12 may be a non-rotatable rod-shaped pressing member.

Reference numeral 14 is a substrate on which side electrodes are formed, and below the linear 1 is the rollers 10 and 12.
It is arranged between. The substrate 14 is fixed at a predetermined position by a positioning member (not shown) with the side surface 14a facing the filament 1 (the substrate side surface 14a facing upward).

In the above structure, the side surface 14a of the substrate 14
In the case of forming a linear electrode on the
A predetermined distance L (distance required for forming electrodes on the side surface of the substrate) is conveyed in the A direction. During this conveyance, the wire strip 1 is attached with the electrode paste by the electrode paste attaching device 8 and the portion to which the electrode paste is attached is stretched with a predetermined tension above the arrangement position of the substrate 14. .

Next, the substrate 14 is fixed at a predetermined position,
Then, the rollers 10 and 12 are lowered. Laura 1
0 and 12 descend while approaching each other (in the figure, B,
(Falling in the direction of B ′), and contacting the predetermined positions on the front surface side and the back surface side of the substrate 14 of the filament 1 respectively.
Is pushed down by a predetermined amount. These rollers 10, 12
As a result, the part of the filament 1 between the rollers 10 and 12 comes into contact with the side surface 14a of the substrate 14 and is brought into pressure contact with a predetermined pressure. At this time, the filament 1 is pulled to the substrate 14 side, but the buffer rollers 6 and 7 move upward to maintain the tension of the filament 1 at a predetermined value.

After that, the rollers 10 and 12 are moved to the substrate 14 side so as to hold the upper tip portion of the substrate 14, that is, the front and back surfaces near the side surface with a predetermined pressure, whereby the filament 1 is The front surface 14b side and the back surface 14c of the substrate 14
It goes around and is pressed against the front surface 14b and the back surface 14c of the substrate 14 with a predetermined pressure (see FIG. 2).

Then, the electrode paste attached to the filament 1 covers the side surface 14a of the substrate 14 and the side surface 14a.
4b side and the back surface 14c side (the substrate side surface 1
4a is transferred to a portion wrapping around at a distance d) to form a linear electrode.

The rollers 10 and 12 are used for the substrate 1
4 from above the side surface 14a to the substrate side surface 14a, and along the substrate 14, the roller 10 to the back surface side 14c,
The roller 12 may be moved to the front surface side 14b.

As described above, according to the present invention, the filament 1 is connected to the roller 1.
0 and 12, front and back surfaces 14b and 1 near the side surface of the substrate 14
4c side and press contact with the substrate 14,
Since the electrode paste attached to the substrate 14 is transferred to the substrate 14, not only the substrate side surface 14a but also the substrate 14
It is possible to easily form linear electrodes on the front and back surfaces 14b and 14c.

In particular, it is formed on the front surface 14b and the back surface 14c of the substrate 14 by adjusting the pressure contact positions of the rollers 10 and 12 to the front surface 14b and the back surface 14c of the substrate 14, that is, the distance d from the substrate side surface 14a. The size of the electrode can be adjusted, and there is an advantage that a long size electrode can be easily formed. Thereby, for example, the substrate 14
It is possible to reliably connect the signal lines formed on the front surface 14b and the back surface 14c by the side electrodes. Further, it is possible to sufficiently secure the solder attachment area as the soldering land.

Although the rod-shaped rollers 10 and 12 are used as the pressing members in the above embodiment, the same effect can be obtained by using a plate material.

FIG. 3 is a perspective view of an essential part showing a state in which the filament 1 is pressed against the substrate 14 by the pressing member made of the plate material. In the figure, reference numerals 15 and 16 denote plate materials having a tapered cross-section. The plate materials 15 and 16 are
The edge portions 15a and 16a are arranged so as to be inclined inward, and the edge portions 15a and 16a are pressed against the front surface 14b and the back surface 14c of the substrate 14 at appropriate angles.

In this embodiment, since the edge portions 15a and 16a of the plate members 15 and 16 come into contact with the respective linear members 1, the respective linear members 21 are more effectively attached to the substrate 1 by the plate members 15 and 16.
Pressed to No. 4. In addition, it is easy to control the amount of the wire strip 1 that wraps around the side surface of the substrate 14 to the front and back surfaces, and the dimensional accuracy of the electrodes that wrap around the front and back surfaces 14b and 14c of the substrate 14 is improved.

Further, in the above embodiment, the electrode pattern to be formed is formed by using the linear strip 1. However, the electrode pattern is formed by applying the linear electrode paste to the strip-shaped electrode paste transfer member. You may do it.

FIG. 4 is a perspective view of an essential part showing the structure of an embodiment using a belt-shaped electrode paste transfer member. This figure shows
In FIG. 1, a flexible ribbon 1 '(electrode paste transfer member) made of a resin film or the like is provided in place of the filament 1.

On the lower surface of the ribbon 1 ', a vertical stripe pattern 1a' of the electrode paste corresponding to the electrode pattern to be formed by the electrode paste coating device 8 is formed. Although the pressing member is omitted in FIG.
The rollers 10 and 12 or the plate members 15 and 1 described above
6 is used, and linear electrodes are formed on the side surface 14a, the front surface 14b, and the back surface 14c of the substrate 14 by the same operation as described above.

In the above embodiment, the filament 1 or the ribbon 1'is moved in one direction each time the electrode is formed. However, the filament 1 or the ribbon 1'is reciprocated back and forth for each electrode formation. May be.

In any of the above embodiments,
Rollers 10 and 12 as pressing members or plate material 1
Reference numerals 5 and 16 denote front and back surfaces 14b and 14c of the substrate 14, respectively.
The rollers 10 and 12 are configured to be pressed against the rollers.
Alternatively, only one of the plate members 15 and 16 may be provided, and the plate members 15 and 16 may be configured to be in pressure contact with only one of the front and back surfaces 14b and 14c of the substrate 14. In this case, it is necessary to fix the filaments 1 or the ribbons 1'on the front and back surfaces 14b and 14c of the substrate 14 on the side where the pressing member does not exist when they are pressed by the pressing member. .

[0047]

As described above, according to the present invention,
A line strip having one or more electrode pastes attached thereto is stretched, and the line strips are pressed against at least one of the front and back surfaces near the side face of the substrate by a pressing member to attach the electrode paste to the substrate side. Since it is transferred to the substrate, the filaments can surely wrap around the front and back surfaces of the substrate, and linear electrodes can be easily formed on the side surface of the substrate and at least one of the front and back surfaces.

Further, by adjusting the press contact position of the pressing member to the front and back surfaces of the substrate, the wraparound amount of the filament on the side surface of the substrate can be adjusted, and the dimension of the electrodes formed on the front and back surfaces of the substrate can be lengthened. it can. Thereby, for example, the signal lines formed on the front and back surfaces of the substrate can be reliably connected to the side surface electrodes. In addition, the solder attachment area as the soldering land can be sufficiently secured, and the quality of the product is improved.

Further, since the pattern of the electrode to be formed is formed by stretching the line, even if the pattern of the electrode to be formed differs depending on the product, the diameter of the line and the space between the lines are different. Various electrode patterns can be easily configured by adjusting the intervals of, and it becomes unnecessary to provide a screen printing pattern for each electrode pattern or prepare a dedicated jig as in the conventional case.

Further, since one or more linear electrode pastes are applied to one surface of the strip-shaped electrode paste transfer member to form an electrode pattern to be formed, the same effect as described above can be obtained. At the same time, since the electrode paste does not adhere to the pressing member, the pressing member does not get dirty.

Further, since the pressing member is composed of a rotatable roller, it rotates when the roller is pressed against the linear or strip electrode paste transfer member, and the linear or electrode paste transfer member is The substrate is pressed against the substrate with a uniform pressure without rubbing against the peripheral surface of the roller.

Further, since the pressing member is made of a plate material having a tapered cross-section and the tip edge portion thereof is brought into contact with each strip or strip-shaped electrode paste member, the pressing force can be effectively applied to each strip or strip. It can be applied to a belt-shaped electrode paste transfer member. In addition, it is easy to control the position of the linear or strip-shaped electrode paste transfer member that comes into pressure contact with the front and back surfaces near the side surface of the substrate, and the dimensional accuracy of the electrodes formed around the front and back surfaces of the substrate is improved. To do.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a method for forming electrodes on a side surface of a substrate according to the present invention.

FIG. 2 is a side view showing a state in which a linear member is pressed against a side surface and front and back surfaces of a substrate by a pressing member.

FIG. 3 is a main part perspective view showing another embodiment of the method for forming an electrode on the side surface of a substrate according to the present invention.

FIG. 4 is a perspective view of an essential part showing still another embodiment of the electrode forming method on the side surface of the substrate according to the present invention.

FIG. 5 is a perspective view showing an example of an SMD having a linear electrode formed on the side surface of a substrate.

FIG. 6 is a perspective view showing a conventional method of forming electrodes on the side surface of a substrate.

[Explanation of symbols]

1 line 1'ribbon (electrode paste transfer member) 1a 'Vertical stripe pattern with electrode paste 2-5 guide rollers 6,7 Buffer roller 8 Electrode paste attaching device (electrode paste attaching means) 9 Electrode paste remover 10, 12 roller (pressing member) 11,13 arms 14 board 14a Substrate side 14b Substrate surface 14c Back side of substrate 15, 16 Plate material (pressing member) 15a, 16a Edge part

Claims (8)

[Claims] 1. A method of forming a linear electrode on a side surface of a substrate having front and back surfaces, the method comprising: forming one or more linear strips having an electrode paste on the side surface of the substrate. After being stretched, the pressing member presses the filament on at least one side surface of the front and back surfaces of the substrate to cause the filament to wrap around to the pressed substrate surface side, and the electrode paste of the substrate A method for forming an electrode on a side surface of a substrate, which comprises transferring the surface and at least one of the front and back surfaces. 2. A method of forming a linear electrode on a side surface of a substrate having front and back surfaces, the method comprising:
Alternatively, a strip-shaped electrode paste transfer member coated with two or more linear electrode pastes is stretched with the application surface of the electrode paste facing the side surface of the substrate, and then the electrode paste transfer member is pressed by the pressing member. By pressing on at least one side surface of the front and back surfaces of the substrate to wrap around the electrode paste transfer member to the pressed surface of the substrate surface, the linear electrode paste on at least one of the side surface and front and back surfaces of the substrate. A method for forming an electrode on a side surface of a substrate, characterized in that the electrode is transferred to the surface. 3. The method for forming an electrode on a side surface of a substrate according to claim 1, wherein the pressing member is a rotatable roller. 4. The method for forming an electrode on a side surface of a substrate according to claim 1, wherein the pressing member is a plate material having a tapered cross section. 5. An electrode forming apparatus for forming a linear electrode on a side surface of a substrate having front and back surfaces, wherein 1 or 2 is provided.
Electrode paste adhering means for adhering the electrode paste to the above filaments, filament tensioning means for tensioning the filaments on which the electrode paste is adhered to the side surface of the substrate, and the filaments of the substrate. And a pressing unit that presses the filament on at least one side of the front and back surfaces to wrap around the filament to the side of the substrate surface on which the filament is pressed, and adheres to the filament by pressing the filament by the pressing unit. An electrode forming apparatus for a side surface of a substrate, wherein the formed electrode paste is transferred onto the side surface of the substrate and at least one of the front and back surfaces. 6. An electrode forming apparatus for forming a linear electrode on a side surface of a substrate having front and back surfaces, wherein a strip-shaped electrode paste transfer means for applying an electrode paste on one surface, and the electrode paste transfer means. An electrode paste applying means for applying an electrode paste to one or two or more filaments; a tensioning means for tensioning the electrode paste transfer means coated with the electrode paste so as to face a side surface of the substrate; and the electrode paste. And a pressing unit that presses the transfer unit on at least one of the front and back surfaces of the substrate to wrap the electrode paste transfer unit around the pressed surface of the substrate surface. By pressing, the linear electrode paste applied to the electrode paste transfer means is transferred to the side surface and at least one of the front and back surfaces of the substrate. An electrode forming device on the side surface of a substrate, which is characterized in that it is copied. 7. The electrode forming device on the side surface of a substrate according to claim 5, wherein the pressing member is a rotatable roller. 8. The electrode forming device on the side surface of a substrate according to claim 5, wherein the pressing member is a plate material having a tapered cross section.