JP2951561B2 - Coil parts for electronic equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a coil component for an electronic device such as a transformer or a choke coil having a magnetic core mounted thereon. The present invention relates to a structure of a coil component for preventing the occurrence of a coil component.

[0002]

2. Description of the Related Art Generally, coil parts for electronic equipment are manufactured in a so-called drum-type surface mount transformer, as shown in a perspective view for explaining an example of assembly in FIG. An upright rectangular tube-shaped bobbin body 1 in which a fitting hole 4 into which the leg 11 is inserted and a winding 6 is wound outward, and the bobbin body 1 are narrowly mounted at both upper and lower ends. An upper terminal 2 and a lower terminal 3 and an electrode terminal 7 disposed on the lower terminal 3
A winding 6 is applied to a coil bobbin 5 having the following configuration and soldered to the electrode terminal 7 and two E-shaped magnetic cores 8 and 9 are provided.
Are mounted on the coil bobbin 5 so as to face each other up and down as shown by arrows, thereby forming a closed magnetic path in the form of a sun.

[0003] Next, a magnetic core, a coil bobbin, and a winding are fixed by sufficiently impregnating wax, varnish, and other coating materials from above to obtain a product.

In some cases, the impregnation (coating) is performed after the magnetic cores or the magnetic core and the coil bobbin are fixed with a resin adhesive.

FIG. 4 is a side view of the surface-mounting transformer 20 assembled as described above, as viewed from the direction A in FIG.

In the figure, the E-shaped magnetic cores 8 and 9 are bonded and fixed to the upper and lower flanges 2 and 3 with adhesives 17 and 18, respectively. Fixed.

The combination of the magnetic cores 10 is as follows.
Center magnetic leg 11 and side magnetic legs 1 arranged in parallel on both sides
2, 13; one end of the center magnetic leg 11 and the side magnetic leg 1;
A yoke portion 14 for connecting one end of each of the second and the second 13 to each other;
In many cases, two E-shaped magnetic cores 8 and 9 having an E-shape in plan view are fitted with the magnetic legs facing each other such that the central magnetic leg 11 is inserted into the insertion hole 4 of the coil bobbin 5. However, there may be a case where an E-shaped magnetic core and a strip-shaped I-shaped magnetic core are combined to form a similar closed circular magnetic path as described above.

In the case of a transformer, as can be seen from the schematic diagram of the combination of the magnetic cores shown in FIG. 5A, the center magnetic legs 11 in the E-shaped magnetic core in which the magnetic legs are opposed to each other for inductance adjustment are combined. A gap G is provided between the surfaces facing each other.

In the case of a choke coil, a gap G is provided in the same manner as the above-mentioned transformer in order to prevent magnetic saturation of the magnetic core when an alternating current is applied.

[0010]

In the structure of the conventional coil device for electronic equipment, since the gap G is present, when the E-shaped magnetic core 10 is energized, the magnetostriction of the magnetic core and the forced vibration due to the magnetic force occur. Therefore, the yoke portions 14 of the upper and lower E-shaped magnetic cores 8 and 9 vibrate up and down with an amplitude W / 2 as shown by broken lines and solid lines in the schematic diagram showing the state of vibration in FIG.

That is, in general, nickel, cobalt, iron alloys and the like are deformed when magnetized, and conversely change their magnetized state when a strain force is applied. This phenomenon is called a magnetostriction (strain) phenomenon. When a magnetic field H is applied, the magnetic field expands or contracts in the direction of H (vibration F indicated by an arrow) (the above phenomenon is particularly called a magnetic Joule effect).

The opposite central magnetic leg face has an opposite magnetic pole N
It has a pole and an S pole, and forced vibration is generated by the magnetic force attracting each other.

Since the vibration of the magnetic core in the AC magnetic field comes into contact with the upper and lower flanges of the coil bobbin in small increments, the vibration is transmitted to the coil bobbin and eventually to the mounting board, causing them to resonate. There is a problem that electronic components and circuits are adversely affected.

When the frequency of the vibration of the coil bobbin or the mounting board is in an audible range, the sound is heard as a vibrating sound, which is annoying.

The present invention has been made in view of the above circumstances, and provides a coil component for electronic equipment having a structure in which vibration of a magnetic core is hardly transmitted directly to a coil bobbin.

[0016]

According to the present invention, there is provided (1) an upright bobbin in which an insertion hole into which a central magnetic leg of an E-shaped magnetic core is inserted is formed inside and a winding is wound outside. A coil is wound on a coil bobbin including a main body, an upper flange and a lower flange for narrowing the winding frame main body at both upper and lower ends, and an electrode terminal disposed on the lower flange, and soldered to the electrode terminal. In addition, in an electronic device coil component in which a sun-shaped closed magnetic path is formed by mounting two E-shaped magnetic cores on the coil bobbin face to face, an upper E-shaped magnetic core and a lower E-shaped magnetic core of the coil bobbin are provided. Is fixed at the joint side of the side magnetic leg with adhesive, and occurs between the yoke portion connecting the center magnetic leg and the side magnetic leg of the upper E-shaped core and the upper flange of the coil bobbin when energized. Provide a gap larger than the vibration amplitude of the E-shaped core, and By providing a coil component for electronic equipment, wherein the inner side surface of the yoke portion of the E-shaped core and the bottom surface of the lower flange of the coil bobbin are bonded and fixed by an adhesive, (2) the center of the E-shaped core is provided inside. An upright bobbin main body in which a fitting hole into which the magnetic leg is inserted is formed and a winding is wound outward, an upper flange and a lower flange narrowing the bobbin main body at upper and lower ends, A coil bobbin having an electrode terminal disposed on the lower flange is wound and connected to the electrode terminal by soldering, and an E-shaped core and an I-shaped core are mounted on the coil bobbin so as to face each other. In a coil component for an electronic device having a closed magnetic circuit,
A yoke section for fixing the joint between the E-shaped core and the I-shaped core with an adhesive at a joint side of the I-shaped core of the side magnetic leg with an adhesive, and connecting the center magnetic leg and the side magnetic leg of the E-shaped core; A gap is provided between the upper flange of the coil bobbin and the vibration amplitude of the E-shaped magnetic core generated at the time of energization, and the inner side surface of the yoke portion of the E-shaped magnetic core and the bottom surface of the lower flange of the coil bobbin are adhesively fixed. (3) In addition, (3) In addition, an upright insertion hole into which the center magnetic leg of the E-shaped core is inserted is formed on the inside, and the winding is wound outside. A coil bobbin having a winding frame body, an upper flange and a lower flange for narrowing the winding frame body at both upper and lower ends, and an electrode terminal disposed on the lower flange is wound around the coil bobbin and soldered to the electrode terminals. Connect and place two E-shaped cores on the coil bobbin. In a coil component for an electronic device in which a sun-shaped closed magnetic circuit is configured by being mounted face-to-face, a yoke portion connecting the center magnetic leg and the side magnetic leg of the upper and lower E-shaped cores, an upper flange of the coil bobbin and A gap larger than the vibration amplitude of the E-shaped magnetic core generated at the time of energization is provided between the upper and lower E-shaped cores, and the upper and lower E-shaped magnetic cores are bonded together at the joint side surface of the center magnetic leg and the side magnetic leg with an adhesive. An electronic device characterized in that the coil bobbin and the upper and lower E-shaped magnetic cores are bonded and fixed together with the lower flange of the coil bobbin at the same time with an adhesive on the joint side surface of the side magnetic leg outside the bobbin main body. The object is achieved by providing a coil component for equipment.

[0017]

In the present invention, the combination structure of the E-shaped magnetic core and the coil bobbin is different from the conventional structure. Instead, both of the E-shaped magnetic cores combined face to face are not directly bonded and fixed to the coil bobbin, but the lower E-shaped magnetic core, that is, The inner surface of the yoke portion on the substrate mounting side (E-shaped magnetic core fitted from the flange on which the electrode terminal is provided) is adhesively fixed to the bottom surface of the lower flange. In addition, a gap C between the upper surface of the yoke portion of the upper flange and the upper surface of the upper flange is larger than that of the related art and is larger than the vibration amplitude W / 2 of the yoke portion due to the expected magnetostriction or magnetic force. It is configured such that even if vibration occurs, it does not contact the upper flange of the coil bobbin.

Accordingly, the lower yoke portion is a fixed end of the vibration, and the upper E-shaped core has the yoke portion as the free end of the vibration and the vibration energy is released upward.
It will not be transmitted directly to the coil bobbin.

The above situation can be similarly applied to a combination of an E-shaped core and an I-shaped core.

Further, in the combination of the E-shaped magnetic cores, the fixed end of the vibration can be a magnetic core joining portion.

That is, the gap G of the central magnetic leg is filled and fixed with an adhesive, and a gap C larger than the vibration amplitude is formed between the inner surfaces of the yoke portions of the upper and lower E-shaped cores and the upper and lower surfaces of the upper and lower flanges. Is provided on both sides. In addition, the adhesive fixing to the coil bobbin is performed by passing the adhesive to the flange portion and bonding at the same time as the joining of the side surfaces of the side magnetic leg joints.

In the above case, the vibration mode is forcibly changed,
The yoke portions of the upper and lower E-shaped magnetic cores are free ends of vibration.

The vibration of the yoke is not directly transmitted to the coil bobbin due to the existence of the gap C.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described in detail with reference to FIGS. Note that parts having the same structure as in the related art are denoted by the same reference numerals.

FIG. 1A shows the relationship between a core having a structure in which two E-shaped cores are combined (EE type) and a bobbin body of a coil bobbin in the coil component for electronic equipment according to claim 1 of the present invention. FIG. 3B is a schematic diagram illustrating the vibration of the E-shaped magnetic core during the energization.

FIG. 2A shows a coil body for an electronic device according to a second aspect of the present invention, in which a core having a structure in which an E-shaped core and an I-shaped core are combined (EI type) and a bobbin frame body of a coil bobbin. It is a schematic diagram for explaining the relationship of,
(B) illustrates a second relationship between a core having a structure (EE type) in which two E-shaped cores are combined and a bobbin main body of a coil bobbin in the coil component for an electronic device according to claim 3 of the present invention. FIG.

First, the components used in the present invention will be described. The coil bobbin used is a phenol resin,
Epoxy resin, diallyl resin, polyester resin, liquid crystal polymer nylon resin, polyamide, PBT, PE
It is made by injection molding a synthetic resin such as T, PPS, urea resin and melamine resin. Note that the present invention is directed to a coil component for an electronic device, and its size is several tens of mm square and belongs to a small category.

The material of each magnetic core such as E type and I type used in the present invention is a magnetic material such as ferrite, silicon steel plate, permalloy, dust core, amorphous alloy, etc.
Usually, ferrite (nickel-zinc-based ferrite, manganese-zinc-based ferrite, etc.) would be appropriate in terms of ease of processing (cutting) and price.

The adhesive used is a thermosetting resin,
Various types such as a thermoplastic resin type and a rubber type can be considered and should be appropriately selected.

Next, in FIG. 1A, the E-shaped magnetic cores 8 and 9 are closely joined at the joint S with the side magnetic legs 12 and 13 facing each other. Is fixed in the same manner as before.
A gap G exists between the surfaces facing each other as in the related art.

On the other hand, the basic structure of the coil bobbin 25 is the same as that of the conventional coil bobbin 5, but the vertical dimension (in other words, the length of the bobbin main body) is equal to the length of the side magnetic leg of the E-shaped magnetic core. And a gap C larger than the vibration amplitude W generated at the time of energization is provided between the upper flange 22 and the inner side surface of the yoke portion 14 of the upper E-shaped magnetic core 8. .

At the same time, the yoke portion 1 of the lower E-shaped magnetic core 9
4 and the bottom surface of the lower flange 23 of the coil bobbin
9 for tight fixation.

Therefore, as shown in FIG. 1 (B), the lower E-shaped magnetic core 9 does not vibrate freely in the yoke portion 14 and the center magnetic leg 11 as in the prior art. Becomes

On the other hand, since the upper E-shaped magnetic core 8 has a gap C larger than the vibration amplitude vertical width W between the inner side surface of the yoke portion and the upper surface of the upper flange 22, forced vibration due to magnetostriction or magnetic force is generated during energization. Even so, the E-shaped core 8 does not come into contact with the upper flange 22, and the energy of the free vibration is released to the space without being directly transmitted to the coil bobbin 25.

The above situation is the same for the combination of the E-shaped core and the I-shaped core.

That is, FIG. 2A shows the vibration at the time of energization in the case of the coil component 31 for the EI type electronic device by a broken line, and the lower I-shaped magnetic core 31 and the coil bobbin 25 are shown. The bottom surface of the lower flange 23 is tightly fixed with an adhesive 29 to be a fixed end of vibration, and the yoke portion 36 of the upper E-shaped magnetic core 35
Does not directly contact the coil bobbin 25 due to the gap C even if it vibrates up and down as a free end, and no vibration is transmitted to the coil bobbin 25. The E-shaped core 35 and I
The shaped magnetic core 31 is adhesively fixed on the side surface with an adhesive 37.

Further, in the combination of the E-shaped magnetic cores 8 and 9 described above, the fixed end of the vibration need not be limited to the yoke portion 14 of the lower E-shaped magnetic core 9. In addition to the conventional impregnation with a soft material such as wax or varnish, the center magnetic legs 11 are joined and fixed to each other with the adhesive 38 so as to fill the gap G in advance. At the same time as joining the side surfaces of the joints of the magnetic legs 12 and 13 with the adhesive 19, a gap C ′ is also provided between the yoke portions 14 and the upper and lower flanges 42 and 43 in the upper and lower E-shaped magnetic cores 8 and 9.
May be provided.

In the case of the above configuration, the vibration mode is forcibly changed, and the yoke portions of the upper and lower E-shaped magnetic cores are free ends of vibration.

As described above, the coil component for an electronic device according to the present invention is characterized in that the fixed end and the free end of the vibration are consciously set so that the magnetic core vibration due to magnetostriction or magnetic force during energization is not directly transmitted to the coil bobbin. And the setting of a gap C provided between the yoke portion of the E-shaped magnetic core and the coil bobbin that vibrates freely. With this structure, the resonance of the coil component body and the mounting board is reduced, and the resonance noise is prevented.

The main point of the present invention lies in the above-mentioned point, and there is no problem in the fine shape of each part of the coil bobbin, and the additional parts (cover, taping, etc.) as the coil parts are not problematic. It goes without saying that the presence or absence does not affect the operation of the present invention.

[0041]

The coil component for an electronic device according to the present invention is configured as described above. (1) The forced vibration of the magnetic core due to magnetostriction or magnetic force at the time of energization is transmitted to the coil bobbin and eventually to the mounting board. And has an excellent effect of suppressing vibration noise caused by resonance.

(2) There is an excellent effect that an adverse effect on the electronic circuit of the mounting board due to the vibration of the coil component during energization can be prevented.

[Brief description of the drawings]

FIG. 1A is a schematic diagram for explaining a relationship between a magnetic core according to claim 1 of the present invention and a bobbin main body of a coil bobbin, and FIG. FIG.

FIG. 2A is a schematic view for explaining the relationship between a magnetic core according to claim 2 of the present invention and a bobbin main body of a coil bobbin, and FIG. 2B is a schematic view illustrating a magnetic core according to claim 3 of the present invention; It is a schematic diagram for explaining the relationship between the coil bobbin and the bobbin main body.

FIG. 3 is a perspective view for explaining an assembling example of a conventional drum type surface mount transformer.

FIG. 4 is a side view of the surface mounting transformer assembled as described above, as viewed from the direction A in FIG. 3;

FIG. 5A is a schematic diagram showing a combination of magnetic cores of a conventional coil component, and FIG. 5B is a schematic diagram showing a state of vibration of the magnetic core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reel frame main body 2, 22 Upper flange 3, 23 Lower flange 4 Fitting hole 5, 25, 45 Coil bobbin 6 Winding 7 Electrode terminal 8 Upper E-shaped magnetic core 9 Lower E-shaped magnetic core 10 E-shaped magnetic core 11 Central magnetic Legs 12, 13 Side magnetic legs 14, 36 Yoke portion 15 Inner surface of yoke portion 17, 18, 19, 29, 37, 38 Adhesive 20 Transformer for surface mounting G Gap C, C 'Gap W Vibration amplitude S Joint

Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) H01F 27/30 H01F 27/26 H01F 27/33 H01F 27/24

Claims (3)

(57) [Claims] 1. An upright bobbin main body in which a central magnetic leg of an E-shaped magnetic core is inserted into the inside and a winding is wound outside, and the bobbin main body is placed at upper and lower ends. A coil bobbin having an upper flange and a lower flange to be narrowly mounted and an electrode terminal disposed on the lower flange is wound and connected to the electrode terminal by soldering, and two E-shaped magnetic cores are connected to the coil bobbin. In a coil component for an electronic device, the upper and lower E-shaped cores of the coil bobbin are joined to each other by attaching the upper and lower E-shaped magnetic cores to each other so as to form a sun-shaped closed magnetic circuit. And a gap larger than the vibration amplitude of the E-shaped magnetic core generated when power is applied is provided between the yoke part connecting the center magnetic leg and the side magnetic legs of the upper E-shaped magnetic core and the upper flange of the coil bobbin. And the inner surface of the yoke of the lower E-shaped core A coil component for electronic equipment, characterized in that a lower flange bottom surface of a rubobin is fixedly adhered by an adhesive. 2. An upright bobbin body in which a central magnetic leg of an E-shaped magnetic core is inserted and a winding is wound outside, and the bobbin body is attached to upper and lower ends. A coil bobbin having an upper flange and a lower flange to be narrowly mounted and an electrode terminal disposed on the lower flange is wound and connected to the electrode terminal by soldering, and the E-shaped core and the I-shaped core are In a coil component for an electronic device in which a sun-shaped closed magnetic circuit is formed by being mounted on a coil bobbin face-to-face, the joint between the E-shaped core and the I-shaped core is formed at the joint side of the I-shaped core of the side magnetic leg. A gap larger than the vibration amplitude of the E-shaped magnetic core generated at the time of energization is provided between the yoke part connecting the center magnetic leg and the side magnetic legs of the E-shaped magnetic core and the upper flange of the coil bobbin while being fixed with an adhesive, and The inner surface of the yoke of the E-shaped core and the bottom surface of the lower flange of the coil bobbin A coil component for an electronic device, wherein the coil component is adhered and fixed by an adhesive. 3. An upright bobbin body in which a central magnetic leg of an E-shaped magnetic core is inserted and a winding is wound outside, and the bobbin body is disposed at upper and lower ends. A coil bobbin having an upper flange and a lower flange to be narrowly mounted and an electrode terminal disposed on the lower flange is wound and connected to the electrode terminal by soldering, and two E-shaped magnetic cores are connected to the coil bobbin. In a coil component for an electronic device, which is configured to have a sun-shaped closed magnetic circuit by being mounted face-to-face on a yoke portion and a coil bobbin connecting the center magnetic leg and the side magnetic leg of the upper and lower E-shaped cores. A gap is provided between the flange and the lower flange that is larger than the vibration amplitude of the E-shaped magnetic core generated at the time of energization, and the upper and lower E-shaped magnetic cores are bonded to each other at the joint side of the center magnetic leg and the side magnetic leg. With adhesive, and coil bobbin and upper and lower E-shaped magnet A coil component for an electronic device, wherein the coil component is fixed to a core at the same time with an adhesive on the joint side surface of the side magnetic leg outside the bobbin main body and the lower flange of the coil bobbin.