JP2001338818A - Inductance element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inductance element, in which a drum core and a ring core are not slipped off from a mounting substrate, leaving sections in the vicinity of the mounting section of a terminal even when an impact is applied to the drum core and the ring core and reliability on the impact is improved. SOLUTION: The inductance element has the drum core 4 in which an upper- end collar 2 is formed at one end of a winding shaft section 1 and a lower-end collar 3 at the other end, a coil 5 wound on the winding shaft section 1, the annular core 7 arranged on the outer circumference of the winding shaft section 1 for the drum core 4 while being bonded by the drum core 4 and an adhesive 6, and the terminal 9 secured to the ring core 7 while being electrically connected by the winding 5 and solder 8. The terminal 9 is installed from the outside of the ring core 7 while being formed in a U shape bent towards a top face 15 from the outer circumferential surface 14 of the ring core 7 and towards an inner circumferential surface 13 from the top face 15, and a mounting section 11 is mounted from the outer periphery of at least the ring core 7 to the winding-shaft opposed surface 16 of the lower-end collar 16 of the drum core 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductance element used for various electronic devices and the like.

[0002]

2. Description of the Related Art A conventional inductance element will be described below with reference to the drawings.

As a conventional inductance element, for example, an element described in Japanese Patent Application Laid-Open No. 10-294221 is known.

FIG. 10 is a perspective view of a conventional inductance element, and FIG. 11 is an exploded perspective view of the same inductance element.

In FIGS. 10 and 11, the conventional inductance element has an upper end flange 22 at one end of a winding shaft portion 21.
A drum core 24 having a lower end flange 23 having a diameter substantially equal to the diameter of the upper end flange 22 at the other end of the winding shaft portion 21; a winding 25 wound around the winding shaft portion 21 of the drum core 24;
4, a ring-shaped ring core 26 having a cylindrical space adhered to the drum core 24 with an adhesive and attached to the drum core 24, and attached to the ring core 26, and electrically connected to the winding 25. Terminal 2
7 is provided.

The terminal 27 is provided with a mounting portion 28 for mounting and a mounting portion 29 for mounting a ring core in connection with the mounting portion 28 so that the two terminals 27 are located diagonally from the outside of the ring core 26. Attached to.

Further, when mounted on a mounting board, the position of the drum core is regulated so that a space is formed between the lower end flange 23 of the drum core 24 and the mounting board.

[0008]

In the above-mentioned conventional configuration,
The drum core 24 and the ring core 26 are the ring core 2
6 mounting portions 29 of two terminals 27 mounted diagonally
Supported only by the mounting substrate.

Generally, the drum core 24 and the ring core 26
Is made of a sintered magnetic material such as ferrite, so that it is brittle. When an impact is applied, the ring core 26 in the vicinity of the mounting portion 29 is cracked, and the drum core 24 and the ring core 26 There has been a problem that the semiconductor device drops off from the mounting board while leaving the vicinity, and the impact reliability is reduced.

The present invention solves the above-mentioned problems. Even if an impact is applied to the drum core or the ring core, the drum core and the ring core do not fall off from the mounting board except for a portion near the terminal mounting portion, and the impact reliability is improved. It is an object of the present invention to provide an inductance element with improved performance.

[0011]

To achieve the above object, the present invention has the following arrangement.

In the invention according to claim 1 of the present invention, in particular, the terminal is provided with a mounting portion for mounting and a mounting portion for connecting a ring core in connection with the mounting portion, and the terminal is provided outside the ring core. This is a configuration provided from the periphery to the winding shaft opposing surface of the lower end flange of the drum core.

According to the above configuration, since the terminal mounting portion is provided at least from the outer peripheral edge of the ring core to the winding shaft opposing surface of the lower end flange of the drum core, when an impact is applied from the upper end flange to the lower end flange of the drum core, the drum core is damaged. Are supported by a terminal mounting portion provided up to the winding shaft facing surface.

Thus, the impact applied to the drum core and the ring core is dispersed to the mounting portion of the terminal, so that the stress applied to the mounting portion of the terminal is reduced, and the crack of the ring core generated near the mounting portion is reduced. It is possible to suppress and improve the impact reliability.

In particular, since the mounting portion of the terminal extends to the winding shaft opposing surface of the lower end flange of the drum core having a large strength, when the impact to the mounting portion is dispersed, the terminal portion cannot withstand the dispersed impact, and the lower end flange of the drum core does not endure. Cracking can be prevented, and impact reliability can be reliably improved.

The second aspect of the present invention is the first aspect of the present invention.
In the described invention, in particular, a plurality of terminal attachment portions are provided.

According to the above configuration, the stress applied to the terminal mounting portion due to the impact is reduced by the increased number of mounting portions, so that cracks in the ring core generated near the mounting portion are suppressed, and the impact reliability is improved. Can be done.

The third aspect of the present invention provides the first aspect.
In the invention described above, in particular, an adhesive is applied and bonded between the upper end flange of the drum core and the ring core along the entire inner peripheral surface of the ring core.

According to the above configuration, since the adhesion between the drum core and the ring core is not a specific part, the impact is not concentrated on the specific part, but is substantially evenly distributed between the drum core and the ring core. Suppress the occurrence of cracks in the vicinity of the bonded part of the ring core,
Impact reliability can be improved.

[0020] The invention according to claim 4 of the present invention is the invention according to claim 1.
In the described invention, in particular, the terminal mounting portion is configured to be bent from the outer peripheral surface of the ring core to the upper surface and from the upper surface to the inner peripheral surface to have a U-shape.

According to the above configuration, when an impact is applied from the upper end flange to the lower end flange of the terminal, the terminal can be efficiently supported by the inner peripheral surface and the outer peripheral surface around the upper surface of the ring core, and the impact reliability can be improved. Can be improved.

The invention described in claim 5 of the present invention is the same as that in claim 4.
In the invention described above, in particular, the terminal mounting portion is caulked to a ring core, and the terminal is mounted to the ring core.

According to the above configuration, even if an impact is applied in any direction, the ring core can be efficiently supported by the upper surface, the inner peripheral surface and the outer peripheral surface, and the impact reliability can be improved.

The invention according to claim 6 of the present invention is characterized by claim 1
In the invention described above, in particular, the configuration is such that an adhesive is applied and bonded between the mounting portion of the terminal and the lower end flange of the drum core and the lower surface of the ring core.

With the above structure, not only when an impact is applied from the upper end flange to the lower end flange of the terminal but also in all directions, the drum core is supported by the terminal mounting portion provided up to the winding shaft facing surface. Can be

As a result, the impact applied to the drum core and the ring core is dispersed to the mounting portion of the terminal, so that the stress applied to the mounting portion of the terminal is reduced, and cracks in the ring core generated near the mounting portion are reduced. It is possible to suppress and improve the impact reliability.

In particular, since the mounting portion of the terminal extends to the winding shaft opposing surface of the lower end flange of the drum core having a large strength, when the impact to the mounting portion is dispersed, the terminal portion cannot withstand the dispersed impact, and the lower end flange of the drum core is not slid. Cracking can be prevented, and impact reliability can be reliably improved.

The invention according to claim 7 of the present invention is characterized by claim 1
In the described invention, in particular, the adhesive is configured to be an elastic adhesive.

According to the above configuration, since the adhesive is elastic,
The impact is also dispersed by the adhesive, and the impact reliability can be improved.

[0030] The invention according to claim 8 of the present invention is the invention according to claim 1.
In the described invention, in particular, the height of the drum core and the height of the ring core are substantially the same.

With the above configuration, the adhesion between the drum core and the ring core by the adhesive can be accurately performed, the flow of the magnetic flux from the drum core to the ring core can be made smooth, and the magnetic characteristics can be improved while the height is reduced.

The ninth aspect of the present invention is the first aspect of the present invention.
In the described invention, in particular, the diameter of the upper end flange and the lower end flange of the drum core is configured to be at least twice the diameter of the winding shaft.

According to the above configuration, more windings can be wound, and the inductor value can be improved.

According to a tenth aspect of the present invention, in the first aspect, the inner diameter of the ring core is at least three times the height.

With the above configuration, the diameters of the upper and lower flanges of the drum core can be increased, the number of windings can be increased, the inductor value can be improved, and the height can be reduced.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiments) The inventions described in all claims of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an inductance element according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the inductance element, FIG. 3 is a perspective view of the inductance element,
FIG. 4 is a bottom perspective view of the inductance element, FIG. 5 is a perspective view of the ring core when terminals are mounted, and FIG. 6 is a perspective view of the ring core after terminals are mounted.

1 to 6, an inductance element according to an embodiment of the present invention has an outer dimension of 6 mm square and a height of 1.5 mm, has an upper end flange 2 at one end of a winding shaft 1, A drum core 4 having a diameter of 5 mm having a lower end flange 3 at the other end of the shaft portion 1, and a winding 5 wound around the winding shaft portion 1 of the drum core 4.
And a ring-shaped ring core 7 attached to the drum core 4 with an adhesive 6 while being disposed on the outer periphery of the winding shaft portion 1 of the drum core 4, and attached to the ring core 7, and electrically connected with the winding 5 and the solder 8. And a terminal 9.

The ring core 7 has a square shape having four corners 10, and one mounting portion 11 for mounting is mounted on the terminal 9.
And two mounting portions 12 connected to the mounting portion 11 for mounting the ring core, and two mounting portions 1 of the terminal 9 are provided.
2 are arranged at adjacent corners 10 of the ring core 7.

In particular, the shape of the ring core 7 is such that the four corners 10 are chamfered to form a circular inner peripheral surface 13 of the ring core 7.
Is the thinnest distance H from the outer peripheral surface 14 of the ring core 7 to
The shape is such that it is located in the middle of adjacent corners 10.

Further, the terminal 9 is attached from the outside of the ring core 7, and has a U-shape bent from the outer peripheral surface 14 to the upper surface 15 and from the upper surface 15 to the inner peripheral surface 13 of the ring core 7. Is at least the outer peripheral edge of the ring core 7 and the winding shaft facing surface 1
6 are provided.

At this time, the mounting portion 11 of the terminal 9 moves from the outer peripheral edge 17 of the ring core 7 located between the two mounting portions 12 to the winding shaft facing surface 16 of the lower end flange 3 of the drum core 4.
It has a rectangular shape that covers the entire lower surface of the lower end flange 3 of the drum core 4 and the lower surface of the ring core 7. The distance W between the opposing mounting portions 11 of the two terminals 9 is set to at least 1 mm or more.

A recess 18 is provided between two adjacent corners 10 of the ring core 7 from one corner 10 to the other corner 10, and a groove 19 is provided in the other corner 10. One of the two mounting portions 12
Is attached to one corner 10 and the other attachment portion 12 is attached to the groove 19 of the other corner 10. In the groove 19, the mounting portion 12 of the terminal 9 and the winding 5 are electrically connected by the solder 8.

Further, the height of the drum core 4 and the height of the ring core 7 are substantially the same, and the distance between the upper end flange 2 of the drum core 4 and the ring core 7 is about 0.1 mm.
Along with the inner peripheral surface 13, an elastic adhesive is applied and adhered over the entire surface, and the elastic adhesive is also applied between the mounting portion 11 of the terminal 9 and the lower end flange 3 of the drum core 4 and the lower surface of the ring core 7. Coated and adhered.

The diameter of the upper end flange 2 and the lower end flange 3 of the drum core 4 is set to 5 mm, which is at least twice the diameter of the winding shaft 1 and 2.2 mm, and 5.2 mm of the inner diameter of the ring core 7. Is three times or more the height dimension of 1.5 mm. At this time, the thickness of the upper end flange 3 and the lower end flange 2 is 0.4
mm, and the width (T) of the bobbin 1 is 0.6 mm.

With the above configuration, the mounting portion 11 of the terminal 9 is provided at least from the outer peripheral edge 17 of the ring core 7 to the winding shaft facing surface 16 of the lower end flange 3 of the drum core 4.
When an impact is applied from the upper end flange 2 to the lower end flange 3, the drum core 4 is supported by the mounting portion 11 of the terminal 9 provided up to the winding shaft facing surface 16.

As a result, the impact applied to the drum core 4 and the ring core 7 is dispersed to the mounting portion 11 of the terminal 9, so that the stress applied to the mounting portion 12 of the terminal 9 is relieved. Ring core 7 generated in
Cracks can be suppressed and impact reliability can be improved.

In particular, since the mounting portion 11 of the terminal 9 extends to the winding shaft opposing surface 16 of the lower end flange 3 of the drum core 4 having a large strength, when the impact to the mounting portion 11 is dispersed, it cannot withstand the dispersed impact. In addition, it is possible to prevent the lower end flange 3 of the drum core 4 from being cracked, and to reliably improve the impact reliability.

The mounting portion 11 of the terminal 9 and the drum core 4
Since the adhesive 6 is applied and bonded between the lower end flange 3 and the lower surface of the ring core 7, not only when an impact is applied from the upper end flange 2 to the lower end flange 3 of the terminal 9, Impact reliability can be improved with respect to impact in the direction.

Further, the adhesive 6 is applied between the upper end flange 2 of the drum core 4 and the ring core 7 along the inner peripheral surface 13 of the ring core 7 instead of a specific part, and is applied and adhered. Therefore, the impact is not concentrated on a specific portion, but is substantially evenly distributed between the drum core 4 and the ring core 7, thereby suppressing the occurrence of cracks in the vicinity of the bonded portion between the drum core 4 and the ring core 7, Impact reliability can be improved. At this time, since the adhesive 6 is an elastic adhesive, the impact can be dispersed by the adhesive, and the impact reliability can be improved.

The mounting portion 12 of the terminal 9 is formed from the outer peripheral surface 14 of the ring core 7 to the upper surface 15 and from the upper surface 15 to the inner peripheral surface 1.
3, the terminal 9 is bent into a U-shape. Therefore, when an impact is applied from the upper end flange 2 to the lower end flange 3 of the terminal 9, the inner peripheral surface 13 and the outer peripheral surface are centered on the upper surface 15 of the ring core 7. The surface 14 allows the ring core 7 to be efficiently supported by the mounting portion 12 of the terminal 9 and is caulked to the ring core 7, so that even if an impact is applied in any direction, the impact reliability is ensured. Performance can be improved.

Further, since the number of the mounting portions 12 of the terminal 9 is two, the stress applied to the mounting portion 12 of the terminal 9 by the impact is:
The size of the mounting portion 12 is reduced by the increase, the cracking of the ring core 7 generated in the vicinity of the mounting portion 12 can be suppressed, and the impact reliability can be accurately improved. It does not degrade sex.

In particular, since the mounting portion 11 of the terminal 9 has a rectangular shape that covers the entire lower surface of the lower end flange 3 of the drum core 4 and the lower surface of the ring core 7, the mountability on the mounting board is improved, and
When an impact is applied to the drum core 4 and the ring core 7, the impact is easily dispersed to the mounting portion 11, and the cracking of the ring core 7 near the mounting portion can be further suppressed.

In addition, since the height of the drum core 4 and the height of the ring core 7 are substantially the same, the adhesion between the drum core 4 and the ring core 7 by the adhesive 6 can be accurately performed, and the magnetic flux from the drum core 4 to the ring core 7 can be improved. And the magnetic characteristics can be improved while reducing the height.

The diameter of the upper end flange 2 and the lower end flange 3 of the drum core 4 is at least twice as large as the diameter of the reel 1.
Since the inner diameter of the ring core 7 is at least three times the height, the diameter of the upper end flange 2 and the lower end flange 3 of the drum core 4 can also be increased, and the winding 5 can be wound more to improve the inductor value. At the same time, the height can be reduced.

As described above, according to the embodiment of the present invention, since the impact applied to the drum core 4 and the ring core 7 is dispersed to the mounting portion 11 of the terminal 9, the mounting portion 1
The stress applied to the terminal 2 is reduced, and cracks in the ring core 7 generated near the mounting portion 12 are suppressed.
Up to the winding shaft facing surface 16 of the lower end flange 3 of the mounting portion 11
When the impact is dispersed, the lower end flange 3 of the drum core 4 can be prevented from being broken due to being unable to withstand the dispersed impact, and the impact reliability can be reliably improved.

Further, not only when an impact is applied from the upper end flange 2 to the lower end flange 3 of the terminal 9 but also in all directions, the impact reliability can be improved.

Further, the flow of the magnetic flux from the drum core 4 to the ring core 7 can be made smooth, and the diameter of the upper end flange 2 and the lower end flange 3 of the drum core 4 can be increased.
Can be wound more to improve the inductor value and reduce the height.

In the embodiment of the present invention, two terminals 9 having a U-shaped mounting portion 12 and a rectangular mounting portion 11 are used. The terminal 9 having the mounting portion 11 having a shape, the terminal 9 having the mounting portion 11 having an arc shape as shown in FIG. 8, and the terminal 9 having a plurality of terminals 9 as shown in FIG. 9 may be used.

[0060]

As described above, according to the present invention, the impact applied to the drum core and the ring core is dispersed to the mounting portion of the terminal, so that the stress applied to the mounting portion of the terminal is reduced, and the vicinity of the mounting portion is reduced. In addition to suppressing the cracking of the ring core generated in the part, the mounting part of the terminal extends to the winding shaft opposing surface of the lower end flange of the drum core, which is large in strength, so it can withstand the distributed shock when dispersing the impact on the mounting part Also, it is possible to prevent the lower end flange of the drum core from breaking.

As a result, even if an impact is applied to the drum core or the ring core, the inductance element having improved impact reliability is provided, in which the drum core and the ring core do not fall off the mounting board except for the portion near the terminal mounting portion. be able to.

[Brief description of the drawings]

FIG. 1 is a sectional view of an inductance element according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the inductance element.

FIG. 3 is a perspective view of the inductance element.

FIG. 4 is a bottom perspective view of the inductance element.

FIG. 5 is a perspective view of a ring core when a terminal is attached.

FIG. 6 is a perspective view of a ring core after terminals are mounted.

FIG. 7 is a bottom perspective view of another inductance element having a T-shaped terminal mounting portion.

FIG. 8 is a bottom perspective view of another inductance element having an arc-shaped terminal mounting portion.

FIG. 9 is a bottom perspective view of another inductance element having a plurality of terminals.

FIG. 10 is a bottom perspective view of a conventional example.

FIG. 11 is an exploded perspective view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Winding shaft part 2 Upper end flange 3 Lower end flange 4 Drum core 5 Winding 6 Adhesive 7 Ring core 8 Solder 9 Terminal 10 Corner part 11 Mounting part 12 Attachment part 13 Inner peripheral surface 14 Outer peripheral surface 15 Upper surface 16 Winding shaft opposing surface 17 Outer peripheral 18 recess 19 groove

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hitoshi Iwasaki 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 5E070 AA01 AB01 AB10 BA05 EA02 EB03

Claims (10)

[Claims] A drum core having an upper end flange at one end of a winding shaft portion and a lower end flange at the other end of the winding shaft portion; a winding wound around the winding shaft portion of the drum core; A ring-shaped ring core attached to the drum core with an adhesive, and a terminal attached to the ring core and electrically connected to the winding. A mounting portion for mounting the ring core is provided in connection with the mounting portion for mounting and the mounting portion, and the terminal is mounted from outside the ring core, and the mounting portion is at least from an outer peripheral edge of the ring core. An inductance element provided up to a winding shaft opposing surface of the lower end flange of the drum core. 2. A terminal according to claim 1, wherein a plurality of terminals are provided.
The inductance element described. 3. The inductance element according to claim 1, wherein an adhesive is applied and bonded between the upper end flange of the drum core and the ring core along the inner peripheral surface of the ring core. 4. The inductance element according to claim 1, wherein the terminal attachment portion is bent from the outer peripheral surface of the ring core to the upper surface and from the upper surface to the inner peripheral surface to have a U-shape. 5. The inductance element according to claim 4, wherein the terminal mounting portion is caulked to a ring core, and the terminal is mounted on the ring core. 6. The inductance element according to claim 1, wherein an adhesive is applied between the mounting portion of the terminal, the lower end flange of the drum core, and the lower surface of the ring core. 7. The inductance element according to claim 1, wherein the adhesive is an elastic adhesive. 8. The inductance element according to claim 1, wherein the height of the drum core is substantially equal to the height of the ring core. 9. The inductance element according to claim 1, wherein the diameter of the upper and lower flanges of the drum core is at least twice the diameter of the winding shaft. 10. The inductance element according to claim 1, wherein the inner diameter of the ring core is at least three times the height.