JP2002289423A - Electronic part and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem raised when a coil component is mounted on the surface of a surface mounting substrate that front ends of the lead wire sections of the coil component must be prefixed by means of fixing members, or holes must be made into the surface mounting substrate for inserting the front end sections of the lead wire sections of a coil, in advance. SOLUTION: The coil component is provided with a coil having a coil body section 2 constituted of a round wire and the lead wire sections 3, and a core member 4 which holds the body section 2. The front end sections 3a of the lead wire sections 3 are substantially formed in plate-like shapes by means of press working and the lead wire sections 3 are bent so that the front end sections 3a are positioned substantially in a plane including the bottom face 4a of the core member 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component used for surface mounting on a surface mounting board and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, when a coil component is surface-mounted on a surface mounting board, in order to obtain a sufficient connection area between a lead wire of a coil constituting the coil component and the surface mounting board,
The tip of the lead wire portion was previously made flat and fixed to a fixing member constituting the coil component, and then the coil component was surface-mounted on a surface mounting board. like that,
FIGS. 11A and 11B show a part of the configuration of the coil component in which the tip of the lead wire portion is fixed to the fixing member.

FIG. 11 (a) shows a plate-like fixing member 14 having a hole 14a disposed on the bottom surface of a core member 13 holding a coil body 11.
FIG. 4 is a diagram showing a part of the configuration of a coil component in which a tip end 12a of a lead wire portion 12 of a coil is passed through a hole portion 14a and further bent and fixed to a fixing member 14.

FIG. 11 (b) is a view showing a part of the configuration of a conventional coil component showing only a portion different from FIG. 11 (a), and shows a fixed part shown in FIG. 11 (a). Member 14
A plate-like fixing member 15 having a notch 15a, which is different from that of the first embodiment, is disposed on the bottom surface of the core member 13. The notch 15a of the fixing member 15
It is a figure which shows a part of structure of the coil component by which 2a is wound and fixed.

On the other hand, there has been a method of surface mounting a coil component on a surface mounting substrate without using a fixing member. that is,
In this method, a predetermined hole is provided in the surface mounting board, and the tip of the lead wire of the coil is inserted into the hole and fixed. FIG. 12 shows a state in which the distal end 12a of the lead wire 12 is inserted into the hole 16a of the surface mount board 16.

[0006]

However, FIG.
In the coil parts shown in (a) and (b), a fixing member for fixing the lead wire portion was required. In addition, since a part of the lead wire is wound around the fixing member and fixed, a step is generated on the bottom surface of the coil component between the part where the lead wire is wound and the other part, and the surface is mounted on the surface mounting board. There is also a problem that it is difficult to stably mount the coil component on the surface.

On the other hand, when the coil component is surface-mounted on a surface mounting board by the method shown in FIG.
There is a problem that a hole for inserting the tip of the lead wire portion of the coil must be provided.

Although the problems of the conventional electronic components have been described with reference to the coil component as an example, the present invention is not limited to the coil component, and an electronic member having a main body and a lead wire portion and a main body of the electronic member are held. In the case of an electronic component having a core member to be mounted, similarly to the above-described coil component, when surface mounting is performed on a surface mounting substrate, a problem that a fixing member is required, or a hole is provided in the surface mounting substrate. There was a problem that I had to put it.

In view of the above-mentioned conventional problems, the present invention provides an electronic component which does not require a fixing member and can be surface-mounted stably on a surface-mount substrate having no holes. The method and aims to provide.

[0010]

Means for Solving the Problems The first invention (claim 1)
The electronic device includes an electronic member having a main body portion and a lead wire portion, and a core member that holds the main body portion of the electronic member. The electronic component in which the lead wire portion is bent such that a front end portion is substantially located on a surface including a bottom surface of the core member.

According to a second aspect of the present invention (corresponding to claim 2), the electronic member is a coil formed of a round wire or a square wire, and the lead wire portion is formed of the round wire or the round wire forming the coil. The electronic component according to the first aspect of the present invention, wherein the electronic component is configured by a square wire, and only the tip end of the lead wire portion has a substantially flat plate shape.

According to a third aspect of the present invention, there is provided an electronic component having an electronic member having a main body and a lead wire, and a core member holding the main body of the electronic member.
A method of manufacturing an electronic component in which the leading end of the lead wire portion is pressed into a substantially flat plate shape, and the lead wire portion is bent so that the leading end is located substantially on a surface including a bottom surface of the core member. is there.

According to a fourth aspect of the present invention (corresponding to claim 4), the electronic member is a coil formed of a round wire or a square wire, and the lead wire portion forms the coil or the round wire or the square wire. The electronic component manufacturing method according to a third aspect of the present invention, wherein the pressing is performed only on the tip end of the lead wire portion.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

In the present embodiment, for convenience of explanation, an electronic component of the present invention and a method for manufacturing the same will be described using a coil component as an example.

First, FIG. 1A shows a side view of the coil component of the present embodiment. As shown in FIG. 1A, a coil component 1 according to the present embodiment includes a coil having a coil body 2 and a lead wire 3 formed of a round wire, and a core holding the body 2 of the coil. The lead wire 3 has a substantially flat plate-like end 3a, and the distal end 3a is located substantially on a surface including the bottom surface 4a of the core member 4. The lead wire portion 3 is bent. The coil component 1 is a surface mount substrate 5
FIG. 1B shows side surfaces of the coil component 1 and the surface mounting board 5 when the surface mounting is performed. When the coil component 1 is viewed from above, it is represented as shown in FIG.

As shown in FIGS. 1A and 1B, the coil component 1 of the present embodiment is different from the conventional coil component shown in FIGS. Not equipped. In addition, since the lead wire portion 3 is bent so that the distal end portion 3a of the lead wire portion 3 is substantially located on the surface including the bottom surface 4a of the core member 4, no step appears on the bottom surface of the coil component 1, Surface mounting on the surface mounting board 5 can be performed stably. As a result, the conductivity is improved as compared with the conventional case. Further, it is not necessary to provide a hole in the surface mount substrate.

Next, a method for manufacturing the coil component 1 shown in FIG. 1A will be described.

FIG. 2 shows a side view of a press mechanism for pressing the leading end of the lead wire portion of the coil formed of a round wire into a substantially flat plate shape. As shown in FIG. 2, the press mechanism according to the present embodiment includes a base 6, a columnar mounting portion 7 having a mounting surface 7a on which a distal end portion of a lead portion of a coil is mounted, and a pressing surface 8a. And a pressurizing unit 8 having

Next, FIG. 3 shows the configuration of the coil before being pressed by the above-mentioned press mechanism. FIG. 3 (a)
FIG. 3A shows a side surface of the coil when the coil is viewed from the same direction as the direction in which the coil shown in FIG.
FIG. 3B shows a side surface of the coil orthogonal to the side surface of FIG.

Then, as shown in FIG. 4, the distal end 3a 'of the lead wire portion 3 of the coil formed of a round wire is placed on the mounting surface 7a.
And the bottom surface of the main body 2 of the coil is brought into contact with the side surface of the mounting portion 7 to stabilize the coil, and the pressing surface 8a is placed on the mounting surface 7a.
The pressing unit 8 is moved downward so as to face the front end 3
Press a '. When the press working is performed in this manner, as shown in FIG.
a can be made substantially flat. FIG.
In (a), illustration of the pressurizing unit 8 is omitted for convenience of explanation. FIG. 5B is a view of the pressing mechanism in a state where the distal end portion 3a of the lead wire portion 3 is pressed, as viewed from above.

Next, the structure of the coil after the press working is shown in FIG. FIG. 6A shows a side view of the coil when the coil is viewed from the same direction as the direction in which the coil shown in FIG. 1A is viewed, and FIG. FIGS. 6A and 6B correspond to FIGS. 3A and 3B, respectively, each showing a side surface of the coil before being pressed. .

Thereafter, as shown in FIG. 7, the lead wire portion 3 is so arranged that the substantially flat tip portion 3a faces the bottom surface of the coil body portion 2 and is substantially parallel to the bottom surface. Bend substantially 90 degrees. When the coil body 2 is held by the core member 4, a coil component as shown in FIG. Note that, when the lead wire portion 3 is bent, the lead wire portion 3 is bent such that the distal end portion 3a is substantially positioned on a surface including the bottom surface 4a of the core member 4.

As described with reference to FIG. 7, the tip 3a
Is opposed to the bottom surface of the coil main body 2, and the lead wire portion 3 is bent substantially 90 degrees, so that the installation area of the coil component 1 when mounted on the surface mounting board can be made smaller than before.

In the above-described embodiment, the press working is performed before the lead wire portion 3 is bent. You may. In short, it suffices that the end portion of the lead wire portion 3 be processed into a substantially flat plate shape by pressing.

In the above-described embodiment, the coil is formed of a round wire, but may be formed of a square wire. As described above, the wire constituting the coil is not limited to the round wire or the square wire. That is, regardless of the cross-sectional shape of the wire, the tip of the lead wire portion of the coil has a substantially flat plate shape, and the tip is substantially positioned on a surface including the bottom surface of the core member. That is, it is only necessary that the lead wire portion is bent.

In the above-described embodiment, as shown in FIG. 7, the lead wire 3 is bent substantially 90 degrees so that the tip 3a faces the bottom surface of the coil body 2. It is not limited that the lead wire portion 3 is bent so that 3a faces the bottom surface of the coil body portion 2.
That is, as shown in FIG. 8, the lead wire portion 3 may be bent in a direction opposite to the bending direction indicated by the arrow in FIG. In short, it is only necessary to bend the lead wire portion 3 so that the substantially flat plate-shaped tip portion 3a is located on a plane substantially parallel to the bottom surface of the coil body portion 2.
This means that the direction in which the lead wire portion 3 is bent does not matter. However, when bending the lead wire portion 3, it is necessary to bend the lead wire portion 3 so that the distal end portion 3a is substantially located on the surface including the bottom surface 4a of the core member 4.

The above-described coil component is used for components constituting a transformer such as a transformer, a choke, and a power inductor.

Further, in the above-described embodiment, the electronic component of the present invention and the method of manufacturing the same have been described by taking a coil component as an example. However, the electronic members constituting the electronic component are not limited to coils. In short, an electronic component according to the present invention includes an electronic member having a main body portion and a lead wire portion, and a core member holding the main body portion of the electronic member, and the leading end portion of the lead wire portion has a substantially flat plate shape. The lead wire portion is bent such that the distal end portion of the lead wire portion is substantially located on a surface including the bottom surface of the core member.

Further, in the above-described embodiment, the case where the lead wire portion of the coil component is bent and mounted on the surface mounting board has been described. You may do it.
FIG. 9A shows a capacitor in which the lead wire portion is not bent, and FIG. 9B shows a capacitor in which the lead wire portion is bent. Similarly, FIG.
0 (a) shows the resistance when the lead wire portion is not bent, and FIG. 10 (b) shows the resistance when the lead wire portion is bent. 9 (b) and 10 (b)
In the capacitors and resistors shown in the above, since the lead wire portions are bent in the same manner as the lead wire portions of the above-described coil components, the capacitors and resistors can be stably mounted on the surface mounting board.

[0031]

As is apparent from the above description, the present invention provides an electronic component which does not require a fixing member and can be surface-mounted stably on a surface-mount substrate having no holes. The manufacturing method can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a coil component according to an embodiment of the present invention.

FIG. 2 is a side view of the press mechanism according to the embodiment of the present invention.

FIG. 3 is a configuration diagram of a coil before being pressed by a press mechanism.

FIG. 4 is a view for explaining a step of pressing a tip portion of a lead wire portion of a coil using a press mechanism.

FIG. 5 is a diagram showing a state in which a tip end of a lead wire portion of a coil is pressed using a press mechanism.

FIG. 6 is a configuration diagram of a coil after being pressed by a press mechanism.

FIG. 7 is a diagram illustrating a process of bending a lead wire portion whose tip is pressed.

FIG. 8 is a view for explaining a process of bending a lead wire portion whose tip is pressed.

FIG. 9 is a configuration diagram of a capacitor.

FIG. 10 is a configuration diagram of a resistor.

FIG. 11 is a partial configuration diagram of a conventional coil component.

FIG. 12 is a diagram showing a state where a conventional coil component is surface-mounted on a surface-mount substrate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coil component 2 Coil main body part 3 Lead wire part 3a, 3a 'Lead wire tip part 4 Core member 4a Bottom surface of core member 5 Surface mount board 6 Base 7 Placement part 7a Placement surface 8 Pressure part 8a Pressure surface DESCRIPTION OF SYMBOLS 11 Coil main body part 12 Lead wire part 12a Tip of lead wire part 13 Core member 14 Fixing member 14a Hole 15 Fixing member 15a Notch 16 Surface mounting board 16a Hole

Claims (4)

[Claims] An electronic member having a body portion and a lead wire portion, and a core member holding the body portion of the electronic member, wherein a tip portion of the lead wire portion has a substantially flat plate shape, The electronic component, wherein the lead wire portion is bent such that a tip portion is substantially located on a surface including a bottom surface of the core member. 2. The electronic device according to claim 1, wherein the electronic member is a coil formed of a round wire or a square wire, and the lead wire portion is formed of the round wire or the square wire forming the coil. 2. The electronic component according to claim 1, wherein only the tip portion has a substantially flat plate shape. 3. An electronic component comprising an electronic member having a main body and a lead wire, and a core member for holding the main body of the electronic member, wherein the tip of the lead wire has a substantially flat plate shape. A method for manufacturing an electronic component, comprising: performing a press working; and bending the lead wire portion so that the front end portion is substantially positioned on a surface including a bottom surface of the core member. 4. The coil according to claim 1, wherein the electronic member is a coil formed of a round wire or a square wire, and the lead wire portion is formed of the round wire or the square wire forming the coil. 4. The method of manufacturing an electronic component according to claim 3, wherein the method is performed only on the tip portion of the lead wire portion.