JP3039927B1 - Coil parts - Google Patents

Abstract

Abstract: [PROBLEMS] To reduce cost by using a case that can be used for both vertical and horizontal coil components without using an adhesive that causes deterioration of inductance over time, the core is protected, and safety is high. Provide a coil component having a structure that can be achieved. A bobbin (2) is configured by combining half bobbin-shaped divided bobbins. The core 1 has a square shape. The gate portion 7 of the case 5 is slidably fitted to the outer magnetic path portions 1a and 1b of the core 1. The gate 7 has a rotation preventing portion 8 which engages with the flange 2d of the bobbin 2 to prevent the bobbin from rotating. The case 5 has a retaining means such as a case fixing piece 6 for preventing the side groove 7b from coming out along the side outer magnetic path portion 1b of the core 1. A portion of the case 5 corresponding to the side surface of the bobbin 2 has an open structure on at least one side, or a cutout portion for inserting lead terminals is provided from below in the bobbin side surface cover portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil component used for a line filter, a noise filter, a transformer, and the like of a power supply circuit of an electronic device, and more particularly, to a mounting structure of a winding bobbin, a core, a case, and the like. The present invention relates to an apparatus for reducing costs by sharing parts.

[0002]

2. Description of the Related Art Japanese Patent No. 27158 discloses coil components such as line filters, noise filters, and transformers.
Forty-seventh publication discloses the one shown in FIGS. FIGS. 5A and 5B show a vertical coil component and a horizontal coil component, respectively, for fixing the core and the bobbin with an adhesive, and have a square-shaped closed magnetic circuit made of a material having high magnetic permeability such as ferrite. One magnetic leg of the core 20 (in the case of FIG. 5A) or the central magnetic leg of the sun-shaped closed magnetic circuit core 21 (FIG.
In the case of (B)), the bobbins 22 and 23 configured by combining divided bobbins made of a resin molded body are incorporated. The bobbins 22 and 23 are rotated by using the gears 24 and 25 provided at the center or end surfaces of the bobbins 22 and 23, so that a pair of windings 26 and 27 are formed on the bobbins 22 and 23. .

[0005] Next, as shown in FIG. 5 (A), a metal lead terminal 29 is inserted into a through hole 22 b provided in a flange portion 22 a of the bobbin 22 and attached. And core 20, bobbin 22
In order to prevent backlash, the flange portion 22a and the core 20 are fixed with the adhesive 30. On the other hand, in the one shown in FIG. 5B, a terminal plate 32 made of a resin molded body to which the lead terminal 31 is attached is attached to the core 21 and the bobbin 23, and the terminal of the winding 27 is wound around the lead terminal 31. wear. Then, the core 21 and the terminal plate 32 are fixed with the adhesive 33.

FIGS. 6A and 6B are a sectional view and a perspective view, respectively, showing another example of the coil component disclosed in the above-mentioned patent publication, in which a case is used. This coil component is formed by covering a case 35 having an open bottom surface with a rectangular core 36 and a bobbin 37 provided with a winding, and a movable tongue 3 provided on the case 35.
By locking the outer magnetic path portion 36a of the core 36 with 9, the rattling of the core 36 is prevented. In this case, a horizontal coil component is formed, and the direction of the lead terminal 40 is perpendicular to the surface of the core 36.

FIGS. 6C and 6D show the above-mentioned square core 36.
And a lead terminal 40 constitutes a vertical coil component having the same direction.
In this case, the case 42 is attached by locking the projection 37b provided on the flange portion 37a of the bobbin 37 to prevent it from falling off.

[0006]

Problems to be Solved by the Invention FIGS. 5A and 5B
When the cores 20 and 21 and the bobbins 22 and 23 are fixed by using the adhesives 30 and 33 as shown in FIG. 3, the stress at the time of curing the adhesives 30 and 33 is applied to the cores 20 and 21 and , 21 are magnetically distorted and the inductance deteriorates with time. In addition, external impact,
Ferrite cores 20, 21 which are conductors due to vibration or the like
However, there was a problem in safety, such as the worst cracking and falling off, causing problems with other parts.

On the other hand, when the horizontal coil parts shown in FIGS. 6A and 6B have different product shapes from the vertical coil parts shown in FIGS. 6C and 6D, a method of fixing the core and the bobbin is used. Although the use of adhesive does not use an adhesive, the safety and the like are improved, but as described above, two types of cases are required for the case structure when the product shape is different from the vertical type and the horizontal type. However, there is a problem in that it becomes complicated in terms of cost and the cost increases.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a case that does not use an adhesive that causes deterioration of inductance over time, has a high core protection and is safe, and can be used for both vertical and horizontal coil parts. It is an object of the present invention to provide a coil component having a structure capable of reducing costs by having a coil component.

[0009]

According to a first aspect of the present invention, there is provided a coil component having a hollow portion accommodating a part of a core, a winding groove portion for winding, and a reed by a combination structure of half-split divided bobbins.
A bobbin having a flange portion provided with a lead terminal, an inner magnetic path portion housed in the hollow portion, and an outer magnetic path portion located outside the bobbin. A parallel outer magnetic path section parallel to the path section, a square-shaped closed magnetic path core including a side outer magnetic path section between both ends of the parallel outer magnetic path section and both ends of the inner magnetic path section, and a case; Wherein the case has a side groove and a top groove which are respectively fitted to the side outer magnetic path portion and the parallel outer magnetic path portion, and the gate is slidably fitted to the core. And a detent portion formed on the portal portion and engaged with a flange portion of the bobbin to prevent the bobbin from rotating, and the case is configured such that the side groove extends along the side outer magnetic path portion of the core. The bobbin end covers at both ends of the case are open on at least one side. Or, by providing a cutout for inserting lead terminals from below on the side cover between the bobbin end covers, the lead terminals can be formed with a vertical coil component protruding from the opposite side of the top groove of the case. ,
The present invention is characterized in that it is possible to realize both structures of a horizontal coil component in which the lead terminals protrude in a direction perpendicular to a core surface.

As described above, the case is slidably fitted to the outer magnetic path of the core, is prevented from coming off by the case retaining means, and the rotation preventing portion of the case comes into contact with the flange of the bobbin to rotate. By stopping, the bobbin and the core are fixed by the case without using an adhesive.
Also, since the core is covered and protected by the case, safety is enhanced. Also, by providing at least one side surface of the case with an open structure or providing a cutout portion from below in the side cover portion, not only the vertical type in which the lead terminal protrudes from the opposite side of the external magnetic path portion, but also the lead terminal Can form a horizontal coil component perpendicular to the core surface.

According to a second aspect of the present invention, in the coil component according to the first aspect, the case has a cover that covers both ends of the bobbin on both sides of the side groove forming portion of the gate portion.

As described above, the end portions of the bobbin are protected by providing the cover portions that cover both end portions of the bobbin.

According to a third aspect of the present invention, in the first or second aspect, the retaining means for the case is locked at a tip of the gate-shaped portion opposite to a top groove forming portion, and a flange portion of a bobbin is provided. And a case fixing piece for holding the bobbin between the case and the case.

Thus, the case is prevented from coming off the bobbin by sandwiching the bobbin between the case and the case fixing piece.

[0015]

1 (A) and 1 (B) are perspective views showing one embodiment of a coil component according to the present invention, and are perspective views of horizontal and vertical coil components, respectively. FIGS. 2A and 2B are perspective views showing a state before the case is attached in the case of being configured as a horizontal coil component and a vertical coil component, respectively. 3A and 3B are a side view and an end view of the case used in the present embodiment.
(C) and (D) are a side view and an end view of a case fixing piece combined with the case. FIG. 4A is a longitudinal sectional view in the case where the coil component is configured in a vertical type in the present embodiment, and FIG. 4B is an EE sectional view of FIG. 4A.

In FIGS. 1, 2 and 4, reference numeral 1 denotes a square-shaped integral closed magnetic circuit core made of a material having high magnetic permeability such as ferrite. 2 is a half-split bobbin 2 made of a resin molded body
This is a bobbin configured by combining a and b. The bobbin 2 is formed with a hollow portion 1h having a penetrating structure for accommodating a part of the core 1 at a joining portion of the divided bobbins 2a and 2b, and a winding groove portion 2c is formed on an outer periphery of the hollow portion 1h. Has a flange 2d. Further, the bobbin 2 has a gear portion 2e at a central portion (or an end surface). Reference numeral 3 denotes a winding wound around the winding groove 2c. Reference numeral 4 denotes lead terminals fixed to the flanges 2d at both ends of the bobbin 2 and protruding to one side. 5
Is a case, the case 5 has a role of protecting the core 1,
It serves to fix the bobbin 2 and the core 1 relatively. Reference numeral 6 denotes a case fixing piece which is combined with the case 5 to prevent the case 5 from falling out of the bobbin 2.

As shown in FIGS. 3 (A) and 3 (B), the case 5 has a
And a detent part 8 for abutting against the locking part on the outer periphery of the flange part 2d of the bobbin 2 to prevent the bobbin 2 from rotating, and a bobbin end cover part 9 for covering the flange parts 2d at both ends of the bobbin 2.

On the inner periphery of the gate-shaped portion 7, a ceiling groove 7a fitted to a parallel outer magnetic path portion 1b parallel to the inner magnetic path portion 1a of the core 1 is provided.
And a side groove 7b fitted into the side outer magnetic path portion 1c of the core 1. The detent portions 8 are formed so as to protrude on both sides of the gate-shaped portion 7 where the ceiling groove 7a is formed. The bobbin end cover portions 9 are formed on both sides of the gate-shaped portion 7 on the side where the side grooves 7b are formed. Case fixing piece 6
Is locked and attached to the tip of the gate-shaped portion 7 on the opposite side of the formation portion of the ceiling groove 7a. The case fixing piece 6 has a pair of protrusions 6 at both ends thereof which are fitted to the front end of the side groove 7b.
a, and has a locking claw 6b on the outer surface of each projection 6a. The locking claw 6b is used to lock the locking hole 7c provided in the side groove 7b forming portion of the gate 7 by utilizing the elasticity of the gate 7 and the case fixing piece 6.

When assembling the coil component, first, the inner magnetic path portion 1a of the core 1 is sandwiched between the divided bobbins 2a and 2b.
The inner magnetic path portion 1a is accommodated in the hollow portion 1h by fitting and fixing the divided bobbins 2a and 2b. Next, the winding 3 is applied to the two winding groove portions 2c of the bobbin 2 while rotating the gear portion 2e of the bobbin 2 from the outside. In this case, the winding start and the winding end of the winding 3 are fixed to eyelets for terminal winding provided on the flanges 2d at both ends of the bobbin 2,
After that, the lead terminal 4 is inserted into the eyelet hole to become an external connection terminal together with the winding terminal, and the main body of the coil component is completed. The lead terminal 4 is fixed to the flange 2d in advance, the winding 3 is applied, the terminal of the winding 3 is entangled with the lead terminal 4, and the lead terminal 4 is moved in one direction by a predetermined length. It may be fixed by soldering.

In the case where the coil component is configured as a vertical type, FIG.
As shown in (B), the relative rotation position of the core 1 with respect to the bobbin 2 is set in a direction in which the lead terminals 4 protrude to the opposite side of the core 1. Then, the case 5 is slidably fitted to the outer magnetic path of the core 1 from the side of the parallel outer magnetic path 1b of the core 1.
That is, the side groove 7b of the gate-shaped portion 7 of the case 5 is slidably fitted into the side outer magnetic path portion 1c of the core 1, and finally, as shown in FIG.
As shown in (1), the top groove 7a of the gate 7 is fitted into the parallel outer magnetic path 1b of the core 1. In the state where the case 5 is fitted to the core 1 in this way, as shown in FIG. 4B, the rotation preventing portion 8 of the case 5 is one side of a flange 2d formed in a shape similar to a rectangle. By contacting the locking portion 2f, the bobbin 2 and the case 5 are relatively prevented from rotating.

Then, in order to prevent the case 5 from slipping out of the bobbin 2, the case fixing piece 6 is mounted from the distal end side of the portal section 7. That is, the protrusion 6a of the case fixing piece 6
From the tip of the side groove 7b of the gate 7, and the locking claw 6b
Is locked in the locking hole 7c. In this state, FIG.
As shown in (B), the case fixing piece 6 comes into contact with a part of the bobbin such as the flange 2d of the bobbin 2, so that the case 5 is prevented from coming off from the core 1. The appearance of this horizontal coil component is as shown in FIG.

In the case where the coil component is configured to be horizontal, FIG.
As shown in (A), the relative positional relationship between the bobbin 2 and the core 1 is set so that the lead terminals 4 project in a direction perpendicular to the surface of the core 1. In this case, lead terminal 4
As shown in FIG. 4 (C), the case is oriented horizontally in the drawing, but the slide fitting of the case 5 to the core 1 causes the rotation preventing portion 8 to abut on the locking portion 2g on one side of the flange portion 2d. The case fixing piece 6 is locked to the gate-shaped portion 7 of the case 5 and is prevented from rotating, so that a horizontal coil component having the appearance shown in FIG. 1A is completed.

As described above, the case 5 has a structure in which the case 5 is slidably fitted along the core 1 and at least one side of the case 5 has an open structure, so that vertical and horizontal coil components can be formed. Further, since the core 1 and the bobbin 2 are fixed by the case 5 and no adhesive is used, the inductance does not deteriorate over time. In addition, the outer magnetic path portions 1b and 1c are protected by the case 5.

In the above-described embodiment, the case 5 is prevented from falling off by using the case fixing piece 6, but the case 5 is provided with a locking piece with the bobbin 2 or the core 1 and locked to prevent the case 5 from falling off. May go.

In the above embodiment, at least one side of the case 5 has an open structure so that the lead terminals 4 do not interfere with the case 5 and horizontal and vertical coil components can be realized. As shown in FIGS. 3 (A) and 3 (B), the rotation preventing portion 8 is extended downward to form a side cover portion 11 of the bobbin 2, and a part thereof is provided with a cut portion 12 which is directed upward from below. Alternatively, the notch 12 may be a place where the lead terminal 4 is inserted when a horizontal coil component is realized, so that a horizontal coil component can also be realized.

The detent portion for preventing the rotation of the bobbin 2 with respect to the core 1 does not stop against the side of the flange portion 2d formed in a substantially rectangular shape as shown in the embodiment. The convex or concave portion provided on the shape portion 7 can also be realized by a structure in which the concave or convex portion provided on the flange portion 2d is engaged.

[0027]

According to the present invention, the case is slidably fitted to the outer magnetic path portion of the core, is prevented from falling off by the case retaining means, and the rotation preventing portion of the case is fitted to the bobbin flange. Since the bobbin and the core are fixed by the case without using an adhesive by abutting and stopping, there is almost no stress applied to the core, almost no magnetic distortion is generated in the core, and the inductance with time is reduced. Deterioration is also very small. In addition, since the core is covered and protected by the case, there is no possibility that the core is damaged by an external impact or vibration, and safety is enhanced. In addition, at least one side of the case has an open structure or a cutout for inserting lead terminals is provided in the bobbin side cover, so that only the vertical type where the lead terminals protrude from the opposite side of the external magnetic path section Instead, it is possible to configure a horizontal coil component with lead terminals protruding from the case side,
Since the case can be used both vertically and horizontally, manufacturing equipment and processes are simplified, which contributes to cost reduction.

[Brief description of the drawings]

FIGS. 1A and 1B are perspective views showing one embodiment of a coil component according to the present invention, which are configured as horizontal and vertical coil components, respectively.

FIGS. 2A and 2B are perspective views showing a state before attaching a case in a case where the case is configured as a horizontal type and a vertical type coil part in the embodiment.

3A and 3B are a side view and an end view of a case used in the present embodiment, and FIGS. 3C and 3D are side views and an end face of a case fixing piece combined with the case, respectively. FIG.

FIG. 4A is a vertical cross-sectional view when a coil component is configured in a vertical shape in the present embodiment, and FIG.
E is a sectional view, and (C) is an equivalent view of (B) when a horizontal coil component is formed.

FIGS. 5A and 5B are conventional vertical and horizontal coil components for fixing a bobbin and a core using an adhesive, respectively.

6A and 6B are a sectional view and a perspective view, respectively, of a conventional horizontal coil component for fixing a bobbin and a core using a case, and FIGS. 6C and 6D are each a bobbin using a case. FIG. 2 is a cross-sectional view and a perspective view of a conventional vertical coil component for fixing a core to a core.

[Explanation of symbols]

1: core, 1a: inner magnetic path, 1b: parallel outer magnetic path, 1
c: side outer magnetic path portion, 2: bobbin, 2a, 2b: divided bobbin, 2c: winding groove portion, 2d: flange portion, 2e: gear portion, 2f,
2g: locking portion, 2h: hollow portion, 3: winding, 4: lead terminal, 5: case, 6: case fixing piece, 6b: locking claw,
7: portal part, 7a: top groove, 7b: side groove, 7c: locking hole,
8: Detent, 9: Bobbin end cover, 11: Bobbin side cover, 12: Notch

Claims (3)

(57) [Claims] 1. A bobbin comprising a hollow portion accommodating a part of a core, a winding groove portion for winding, and a flange portion for providing a lead terminal by a combination structure of split bobbins having a half-split shape. An internal magnetic path portion accommodated in the hollow portion, and an external magnetic path portion located outside the bobbin, the external magnetic path portion is a parallel external magnetic path portion parallel to the internal magnetic path portion A coil-shaped core comprising: a square-shaped closed magnetic path core comprising a side outer magnetic path portion between both ends of the parallel outer magnetic path portion and both ends of the inner magnetic path portion; and a case, A case is formed in the gate-shaped portion, which has a side groove and a top groove respectively fitted in the side outer magnetic path portion and the parallel outer magnetic path portion, and is slidably fitted into the core, and the gate-shaped portion, A detent portion for engaging the bobbin flange portion to detent the bobbin, wherein the case has the side groove along the side outer magnetic path portion of the core. A portion corresponding to the bobbin side surface of the case has an open structure on at least one side, or a cutout portion for inserting lead terminals is provided on the bobbin side cover portion from below by providing a cutout portion from below. The present invention has realized both the structure of a vertical coil component in which the lead terminal protrudes from the opposite side of the top groove of the case, and the structure of a horizontal coil component in which the lead terminal protrudes in a direction perpendicular to the core surface. Characterized coil parts. 2. The coil component according to claim 1, further comprising a cover that covers both ends of the bobbin on both sides of the side groove forming portion of the gate-shaped portion of the case. 3. The case according to claim 1, wherein the case retaining means is locked to a tip of the gate-shaped portion opposite to a top groove forming portion, and abuts on a flange portion of the bobbin to form a connection with the case. A coil component comprising a case fixing piece sandwiching a bobbin between the coil components.