JP2004241587A - Winding coil component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a winding coil component capable of attaining a series of inductance values while preserving uniform outside dimensions of the components. <P>SOLUTION: There is provided the winding coil component that includes a core that is insulative and comprises flanges provided in a winding center core and both ends of the winding center core, terminal electrodes formed at least in the bottom of the flanges, and a plurality of wires that are insulative and are wound on the winding center core and further each of both ends thereof are coupled to the terminal electrodes. In the winding coil components, each of the numbers of turns in the plurality of the wires is different. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【００２８】
表１に示すように、比較例１でワイヤの巻数が２回のときのインダクタンス値は２．７ｎＨであり、巻数が３回のときは３．９ｎＨであった。また、比較例２でワイヤの巻数が２回のときのインダクタンス値は２．４μｍであり、３回のときは３．６μｍであった。これらに対し、本実施例のインダクタンス値は３．０ｎＨであった。
【００２９】
このように、２本のワイヤの巻数が異なるように巻回されることにより、１本のワイヤを用いたとき、あるいは２本のワイヤの巻数が同一のときには取得不可能であったインダクタンス値を取得することができる。これにより、部品の外形寸法を統一したままで、多数のインダクタンス値の系列を得ることができるという効果を有する。
【００３０】
なお、本発明の請求の範囲はこれまで述べてきた実施の形態に限定されるものではない。例えば、上述の実施形態ではワイヤの本数は２本であるが、３本以上であってもよい。ワイヤの本数が増えるほど、ワイヤの巻数の組み合わせが増加するため、取得可能なインダクタンス値が増加する。
【００３１】
また、上述の実施形態では、１本目に巻回されるワイヤ６ａの巻数が３回で、２本目に巻回されるワイヤ６ｂの巻数が２回であるが、他の巻数であってもよい。また、２本目のワイヤの巻数が１本目のワイヤの巻数より多くてもよい。
【００３２】
さらに、上述の実施形態では、二本のワイヤの径は同一であるが、異なる径であってもよい。
【００３３】
【発明の効果】
以上述べたように、本発明の巻線型コイル部品は、巻芯部及び前記巻芯部の両端に設けられる鍔部より構成される絶縁性コアと、前記鍔部の少なくとも底面に形成された端子電極と、前記巻芯部に巻回されるとともに両端部がそれぞれ前記端子電極に接続される複数の導電性ワイヤを備えるものであって、前記複数のワイヤの巻数が同一でない構成とすることにより、ワイヤが１本のとき、あるいは複数のワイヤの巻数が同一のときには取得不可能であったインダクタンス値を取得することができる。したがって、部品の外形寸法を統一したままで、多数のインダクタンス値の系列を得ることができるという効果を有する。
【図面の簡単な説明】
【図１】本発明の一実施の形態による巻線型コイル部品の外観斜視図である。
【図２】図１の巻線型コイル部品の底面図である。
【図３】図１の巻線型コイル部品の製造における端子電極の形成工程を説明する図である。
【図４】図１の巻線型コイル部品の製造における巻芯部へのワイヤ巻回工程を説明する図である。
【図５】図１の巻線型コイル部品の製造におけるコーティング材の形成工程を説明する図である。
【図６】従来の巻線型コイル部品の外観斜視図である。
【符号の説明】
１、１１ 巻線型コイル部品 ２、１２ コア
３、１３ 巻芯部
４ａ、４ｂ、１４ａ、１４ｂ 鍔部
５ａ、５ｂ、１５ａ、１５ｂ 端子電極
６ａ 第一のワイヤ ６ｂ 第二のワイヤ
７ａ、７ｂ （第一のワイヤの）ワイヤ端部
７ｃ、７ｄ （第二のワイヤの）ワイヤ端部
８、１８ コーティング材 １６ ワイヤ
１７ａ、１７ｂ ワイヤ端部 ２１ ホルダ
２２ 導電ペースト ２３、３３ 定盤
２４ チャック ２５ 巻線用ノズル
２６ チャックの回転方向 ２７ ＵＶ光線[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wound coil component, and particularly to a small, chip-shaped wound coil component used in a high-frequency circuit.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. H10-312922 discloses an example of a wound coil component in which a conductive wire is wound around an insulator core. FIG. 6 shows the configuration of this wound coil component.
[0003]
In FIG. 6, the coil-type coil component 11 has a core 13 made of a magnetic ceramic, and a core 12 composed of flanges 14a and 14b provided at both ends of the core 13. Also, terminal electrodes 15a and 15b are formed on the bottom surfaces of the flange portions 14a and 14b and on four side surfaces adjacent to the bottom surface, respectively. A conductive wire 16 is wound around the core 13, and wire ends 17 a and 17 b of the wire 16 are connected to terminal electrodes 15 a and 15 b, respectively. Further, a coating material 18 made of resin is formed on the upper part of the core.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 10-312922
[Problems to be solved by the invention]
In recent years, it has become very difficult to match between circuit elements or between transmission lines in the design of high-frequency circuits, so that a rich series of inductance values of coil components has been required. ing. This requirement is particularly strong in a region where the inductance value is very small (10 nH or less).
[0006]
However, in the above-described conventional wound-type coil component, only a coil component having an integral number of turns such as one, two, or three turns can be manufactured, and only an inductance value corresponding to each number of turns can be obtained. Can not. For example, when one conductive wire having a diameter of 50 μm is wound around a 1005 size (bottom size of 1.0 mm × 0.5 mm) wound-type coil component, when the number of turns is one, 1.5 nH, twice In this case, only discrete values such as 2.7 nH and 3.9 nH for three times can be obtained. Therefore, there is a problem that the inductance value of the E12 series or the E24 series in the JIS standard cannot be obtained without omission.
[0007]
In order to solve the above-described problems, an object of the present invention is to provide a coiled coil component capable of obtaining a series of a large number of inductance values while unifying the external dimensions of the component.
[0008]
[Means for Solving the Problems]
In order to solve the above-described problem, a wound-type coil component of the present invention has an insulating property, a core including a core portion and flange portions provided at both ends of the core portion, and at least the flange portion. A terminal electrode formed on the bottom surface; and a plurality of wires having conductivity and wound around the core and having both ends connected to the terminal electrode. Are not the same.
[0009]
With such a configuration, it is possible to obtain an inductance value that cannot be obtained when the number of wires is one or when the number of turns of a plurality of wires is the same. This has the effect that a large number of series of inductance values can be obtained while keeping the external dimensions of the components unified.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of a wire-wound coil component according to the first embodiment of the present invention. FIG. 2 is a bottom view of the wire-wound coil component.
[0011]
As shown in FIG. 1 or FIG. 2, the wound coil component 1 includes a core portion 3 and a core 2 including flange portions 4 a and 4 b provided at both ends of the core portion 3. Further, terminal electrodes 5a and 5b are formed on the bottom surfaces of the flange portions 4a and 4b and four side surfaces adjacent to the bottom surface, respectively. Two conductive wires 6 a and 6 b are wound around the core 3. Wire ends 7a and 7b at both ends of the wire 6a are connected to terminal electrodes 5a and 5b, respectively. The wire ends 7c and 7d at both ends of the wire 6b are connected to the terminal electrodes 5a and 5b, respectively. Further, a coating material 8 made of resin is formed on the upper part of the core 3 around which the wires 6a and 6b are wound.
[0012]
Next, a method for manufacturing the wound coil component 1 will be described with reference to FIGS.
[0013]
First, a ceramic powder such as alumina is molded into a desired shape by a method such as press molding, and then fired to obtain an insulating core 2. The core 2 has a shape composed of a core 3 and flanges 4a and 4b at both ends of the core.
[0014]
Next, for example, a conductive paste containing Ag as a main component is applied to the flange portions 4a and 4b by a dipping method or a printing method, so that the terminal electrodes 5a and 5b are formed. FIG. 3 is a diagram illustrating a process of forming the terminal electrodes 5a and 5b by a dipping method.
[0015]
As shown in FIG. 3A, the core 2 is held by the holder 21 such that the bottom surfaces of the flanges 4a and 4b face downward. The conductive paste 22 is formed on the surface plate 23 so that the flanges 4 a and 4 b are thinner (for example, 0.5 to 1.0 mm) than the height of the upper part protruding above the core 3. In this state, the holder 21 is moved downward, and is immersed in the conductive paste 22 until the bottom surfaces of the flanges 4a and 4b come into contact with the platen 23. As a result, the conductive paste 22 is applied to the bottom surfaces of the flange portions 4a and 4b and the four adjacent side surfaces. Thereafter, the holder 21 is pulled up (FIG. 3B), and the terminal electrodes 5a and 5b are formed by drying and firing. The conductive paste is preferably applied so as to have a thickness of about 10 to 30 μm after drying and firing.
[0016]
Next, the wires 6 a and 6 b are wound around the core 2. FIG. 4 is a diagram for explaining a wire winding step.
[0017]
As shown in FIG. 4A, one end of the core 2 is fixed to the chuck 24. Next, the wire end 7a of the wire 6a extracted from the winding nozzle 25 is connected to the terminal electrode 5a by thermocompression bonding using a heater chip. Although the wire 6a has an insulating film, the insulating film near the wire end 7a is removed by the heat applied during the thermocompression bonding.
[0018]
Next, the wire 6a is wound around the core 3 by a spindle method. That is, the chuck 6 to which the core 2 is fixed is moved in the length direction while rotating about the length direction of the core 2 as a rotation axis, so that the wire 6a extracted from the winding nozzle 25 whose position is fixed. Is wound around the core 3. As shown in the figure, the number of turns of the wire 6a is three.
[0019]
Next, the wire end 7b of the wire 6a wound around the core 3 is connected to the terminal electrode 5b by thermocompression and cut.
[0020]
Next, by the same process as described above, the second wire 6b is wound around the core 3 with two turns as shown in FIG. 4B. The wire ends 7c and 7d of the wire 6b are connected to the external electrodes 5a and 5b, respectively.
[0021]
As a material of the wire, a magnet wire made of Cu, a Cu alloy wire, or the like is suitably used. Further, the wire is coated with an insulating film, and a polyurethane-based or polyester-based resin is suitably used as a material of the insulating film. Further, the wire 6a and the wire 6b may have different wire diameters.
[0022]
The wound coil component obtained by the above steps already has a function as a coil. However, in order to protect the wire and handle the component conveniently, a coating material is formed on the upper surface of the core 2 as described below. Preferably.
[0023]
FIG. 5 is a view for explaining a step of forming a coating material. As shown in FIG. 5A, the core 2 is held by the holder 21 so that the upper surfaces of the flanges 4a and 4b are lower (terminal electrodes are upper). Further, a coating material 8 made of, for example, a UV curable resin paste is formed on the surface plate 33 at a predetermined depth.
[0024]
Next, the upper portion of the core 2 is immersed to a predetermined depth and pulled up, so that the coating material 8 is applied to the upper portion of the core 2 (FIG. 5B). Here, it is preferable that the coating material 8 is formed so as to reach the core 3. For example, when the height of the flanges 4a and 4b protruding upward from the core 3 is 0.1 mm, the vertical application width of the coating material 8 may be 0.15 to 0.3 mm. preferable. Further, the coating material 8 may be applied to the entire surface except for the terminal electrodes 5a and 5b.
[0025]
Next, the coating material 8 is cured by irradiating the coating material 8 with UV (FIG. 5C). Thus, the wound coil component 1 is obtained.
[0026]
Table 1 shows the inductance values of the obtained coiled coil component 1. The size of the core bottom was 1.0 mm × 0.5 mm, and the diameter of the wire was 50 μm. Further, the manufacturing conditions such as the size of the core are all the same as those in the example, and the number of wires is one (Comparative Example 1), and the number of wires is two and the number of turns is the same (Comparative Example 2). ) Are shown in Table 1 together.
[0027]
[Table 1]

[0028]
As shown in Table 1, in Comparative Example 1, the inductance value was 2.7 nH when the number of turns of the wire was two, and was 3.9 nH when the number of turns was three. In Comparative Example 2, when the number of turns of the wire was two, the inductance value was 2.4 μm, and when the number of turns was three, it was 3.6 μm. On the other hand, the inductance value of the present example was 3.0 nH.
[0029]
In this manner, by winding the two wires so that the number of turns is different, the inductance value which cannot be obtained when one wire is used or when the number of turns of the two wires is the same is reduced. Can be obtained. This has the effect that a large number of series of inductance values can be obtained while keeping the external dimensions of the components unified.
[0030]
Note that the scope of the present invention is not limited to the above-described embodiments. For example, in the above embodiment, the number of wires is two, but may be three or more. As the number of wires increases, the combination of the number of turns of the wires increases, so that the obtainable inductance value increases.
[0031]
In the above-described embodiment, the number of turns of the first wire 6a is three and the number of turns of the second wire 6b is two. However, another number of turns may be used. . Further, the number of turns of the second wire may be larger than the number of turns of the first wire.
[0032]
Further, in the above embodiment, the two wires have the same diameter, but may have different diameters.
[0033]
【The invention's effect】
As described above, the wound coil component of the present invention includes an insulating core including a core and flanges provided at both ends of the core, and a terminal formed on at least a bottom surface of the flange. An electrode, comprising a plurality of conductive wires wound around the core and connected to the terminal electrodes at both ends, wherein the number of turns of the plurality of wires is not the same. When the number of wires is one, or when the number of turns of a plurality of wires is the same, an inductance value that cannot be obtained can be obtained. Therefore, there is an effect that a series of a large number of inductance values can be obtained without unifying the external dimensions of the components.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a wire-wound coil component according to an embodiment of the present invention.
FIG. 2 is a bottom view of the wire-wound coil component of FIG.
FIG. 3 is a view for explaining a step of forming a terminal electrode in the manufacture of the wound coil component of FIG. 1;
FIG. 4 is a diagram illustrating a step of winding a wire around a core in the manufacture of the coiled coil part of FIG. 1;
FIG. 5 is a diagram illustrating a step of forming a coating material in the manufacture of the wound coil component of FIG. 1;
FIG. 6 is an external perspective view of a conventional wound coil component.
[Explanation of symbols]
1, 11 Wound coil component 2, 12 Core 3, 13 Core 4a, 4b, 14a, 14b Collar 5a, 5b, 15a, 15b Terminal electrode 6a First wire 6b Second wire 7a, 7b Wire ends 7c, 7d (of one wire) Wire ends 8, 18 (of second wire) Coating material 16 Wires 17a, 17b Wire ends 21 Holder 22 Conductive paste 23, 33 Platen 24 Chuck 25 For winding Nozzle 26 Chuck rotation direction 27 UV light

Claims (1)

A core having an insulating property, the core including a core portion and flange portions provided at both ends of the core portion; a terminal electrode formed on at least a bottom surface of the flange portion; A wire-wound coil component comprising: a plurality of wires wound around a core and both ends connected to the terminal electrodes, wherein the plurality of wires have different numbers of turns.

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