JP2017118089A - Coil electronic component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil electronic component.SOLUTION: A coil electronic component has a structure including a body having a coil pattern, and a display formed on the surface of the body, and having a base region, and a marking region formed of a white pigment on a part of the base region. With such an arrangement, excellent discrimination can be implemented when indicating the direction of a component.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coil electronic component.

  An inductor is one of the parts that form an electronic circuit together with a resistor and a capacitor, and is formed by winding a coil around a ferrite core (core) or printing electrodes on both ends. It is used as a part for noise removal and LC resonance circuit. Inductors can be classified into various forms such as a laminated type, a wound type, and a thin film type according to the form of the coil.

  In the case of an inductor, since the capacitance value varies depending on the direction of the internal coil, it is necessary to distinguish the upper and lower sides of the component, and for this purpose, a process for marking the display portion on the surface of the component is necessary. Recently, with the downsizing and multi-functionalization of electronic products, the size of parts tends to be reduced, and such a marking area is also reduced. When the marking area is reduced, it is difficult to identify the display unit, which causes problems such as a decrease in component yield and an increase in process time.

  Thus, in the art, attempts have been made to improve the discriminating power of the display marked on the surface of the inductor, which is further required when the component size is small. . In this regard, one object of the present invention is to provide a coil electronic component having a display unit with excellent discrimination power.

  As a method for solving the above-described problems, the present invention seeks to propose a novel structure of a coil electronic component through an embodiment. Specifically, a structure including a body including a coil pattern, and a display unit formed on the surface of the body and having a base region and a marking region formed of a white pigment on a part of the base region. It is.

  In this case, the marking area can be formed so as to fill a groove formed on the upper surface of the base area.

The white pigment is typically TiO ₂ and the marking area can be formed by a paste printed on the base area.

In addition, since excellent discrimination can be realized only when the white pigment particles are present in a dense form, the TiO ₂ powder included in the paste may have a BET of 5.0 m ² / g or more. In addition, the TiO ₂ powder included in the paste may be included in about 20-22%.

  By using the coil electronic component proposed in one embodiment of the present invention, the discriminating power of the display part marked on the surface can be remarkably improved, so the efficiency of the process related to the coil electronic component is improved. be able to.

1 is a perspective view schematically showing a coil electronic component according to an embodiment of the present invention. 1 is an exploded perspective view schematically showing a coil electronic component according to an embodiment of the present invention. It is sectional drawing which showed the structure of the display part employable by embodiment of FIG. FIG. 2 shows various forms of marking areas that can be employed in the embodiment of FIG. The behavior of the light incident on the marking region when the white pigment is not densely formed and when it is densely formed is schematically shown. The behavior during sintering of white pigment powders having different particle sizes is schematically shown.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. In addition, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. Accordingly, the shape and size of elements in the drawings may be exaggerated for a clearer description.

  1 and 2 schematically show a coil electronic component according to an embodiment of the present invention, and are a perspective view and an exploded perspective view, respectively. FIG. 3 is a cross-sectional view showing the configuration of a display unit that can be employed in the embodiment of FIG. FIG. 4 shows various forms of marking areas that can be employed in the embodiment of FIG.

  In the present embodiment, the multilayer electronic inductor 100 is described as an example of the coil electronic component 100. However, the display unit 102 corresponding to the unique configuration in the present embodiment is not limited to the technical concept. The present invention can also be applied to an inductor of the form.

  First, referring to FIG. 1 and FIG. 2, the coil electronic component 100 mainly includes a body 101 including a plurality of sheets 103 on which a coil pattern 104 is formed, and a display unit 102 formed on the surface of the body 101. And In this case, although not shown, an external electrode that is electrically connected to the coil pattern 104 and formed outside the body 101 can be provided. In this embodiment, the body and the display unit, which are main components, are provided. The illustration and description of other configurations other than 102 are omitted.

  The plurality of sheets 103 included in the body 101 can be integrated so that a boundary between adjacent sheets 103 cannot be confirmed by using a scanning electron microscope (SEM) by a sintering process. However, the present invention is not necessarily limited to this. Further, the shape and dimensions of the body 101 are not limited to those shown in the present embodiment, and the thickness of the sheet 103 can be arbitrarily changed according to the capacity design of the coil electronic component 100.

The plurality of sheets 103 may include a magnetic material, for example, Al ₂ O ₃ based dielectric, Mn—Zn based ferrite, Ni—Zn based ferrite, Ni—Zn—Cu based ferrite, Mn—Mg based ferrite, Any one or more selected from the group consisting of Ba ferrite and Li ferrite can be included. Further, the plurality of sheets 103 can include metal magnetic powder. In this case, the metal magnetic powder that can be included in the sheet 103 is iron (Fe), silicon (Si), boron (B), chromium (Cr), aluminum (Al), copper (Cu), niobium (Nb). ) And nickel (Ni) or a crystalline or amorphous metal containing any one or more selected from the group consisting of nickel (Ni). An example of such a material is Fe-Si-B-Cr amorphous metal. In addition, an oxide film is formed on the surface of the metal magnetic powder to ensure the insulation of the metal magnetic powder.

  The coil pattern 104 is formed in the shape of a conductor pattern on the plurality of sheets 103, and can be formed using a method such as printing a conductive paste containing a conductive metal on the sheet 103, for example. As shown in FIG. 2, the coil pattern 104 can be electrically connected to those formed in other layers to form a coil structure, and for the electrical connection between the layers. Although not shown, a conductive via can be provided through the sheet 103. On the other hand, the conductive metal forming the coil pattern 104 is not particularly limited as long as it is a metal having excellent electrical conductivity. For example, silver (Ag), palladium (Pd), aluminum (Al), nickel (Ni), Titanium (Ti), gold (Au), copper (Cu), platinum (Pt) or the like may be used alone or in a mixed form.

  In the case of this embodiment, a display unit 102 that can identify the mounting direction of the coil electronic component 100 is formed on the surface of the body 101 and on the upper part with reference to FIGS. The display unit 102 includes a base region B and a marking region M, and the marking region M is formed on a part of the base region B with a white pigment.

  The base region B is made of a darker material than the marking region M, and can be black as in the form shown in FIG. In this case, excellent discrimination can be provided by comparing white and black with complementary colors. The base region B includes the same magnetic material as the sheet 103 included in the body 101, and a black pigment can be added thereto. In this case, the base region B can be laminated together with the plurality of sheets 103 to form an integral structure with the body 101.

As described above, the marking region M is formed of a white pigment, and TiO ₂ can be used as an example of such a white pigment. As shown in FIG. 3, the marking region M can be formed so as to fill a groove formed on the upper surface of the base region B, and the upper surface of the marking region M and the upper surface of the base region B are It can be formed in a co-plane form.

As an example of a method for obtaining the form shown in FIG. 3, a white pigment can be paste-printed on the base region B, and pressure can be applied to the base region B in this process. In this case, the paste for printing the white pigment may include TiO ₂ powder and glass, where the glass has a relatively high sintering temperature of TiO ₂ , and thus TiO ₂ during the sintering process. It can be added for the role of connecting the powder. Of the paste for forming the marking region M, the white pigment remaining after sintering needs to remain in a sufficient amount for ensuring discrimination power. In this case, the TiO ₂ powder is contained about 20-22% of the paste components, when added to about 150% of the glass relative to the TiO ₂ powder, marking area M of the white pigment form having excellent discrimination is obtained .

  As in the present embodiment, by adopting the marking region M having high visibility so as to have excellent discrimination power in the dark base region B, the efficiency is improved in the process of mounting the coil electronic component 100 or the like. Can be expected. The excellent visibility and discriminating power can exert a greater effect particularly when the size of the coil electronic component 100 is small. Here, the case where the size is small is defined as the case of 0603 size, that is, the case where the body length L and width W are smaller than 6 mm and 3 mm, respectively, based on the form shown in FIG. Can do. However, since the standard of size is relative, the display unit 102 proposed in the present embodiment does not necessarily have to be applied only to 0603 size elements.

  On the other hand, in the present embodiment, the form of the display unit 102, that is, the form of the base region B and the marking region M is variously modified depending on the size, form, identification method, etc. of the electronic component as shown in FIG. Can be done. In addition to the form shown in FIG. 4, other forms may be used as necessary.

  Such a highly visible marking region M can be realized by forming a dense inter-particle connection structure after sintering using a white pigment powder having a relatively small particle size. This will be described with reference to FIGS. FIG. 5 schematically shows the behavior of light incident on the marking region when the white pigment is not densely formed and when it is densely formed. As shown in FIG. 5, when the white pigment particles are not densely arranged (on the left side), the amount of light that is scattered or absorbed increases, so that the discriminating power of the marking region is significantly reduced. . Compared to this, when the white pigment is formed densely, the visibility can be greatly improved by reflecting most of the light.

  In this regard, FIG. 6 schematically shows the behavior during sintering of white pigment powders having different particle sizes. As shown in FIG. 6, when the size of the particles is relatively large (upper part of FIG. 6), the size of the voids formed between the particles is large even after sintering, which makes the dense It becomes difficult to obtain an interparticle connection structure. On the other hand, when the particle size is relatively small (lower part of FIG. 6), fine voids remain after sintering, which does not significantly affect the discrimination power. I can say that.

Based on such an idea, the inventor of the present invention experimented on the particle size of a white pigment, that is, TiO ₂ powder capable of sufficiently ensuring white visibility, in terms of specific surface area (BET), and TiO _2. When the BET of the powder was 5.0 m ² / g or more, it was confirmed that a dense inter-particle connection structure that does not cause a decrease in discrimination power was obtained.

  As described above, the coil electronic component proposed in one embodiment of the present invention can provide a display unit with excellent discrimination power by implementing the connection structure of color pigment particles in a remarkably dense state. Thereby, the efficiency of the process related to the coil electronic component can be greatly improved.

  As mentioned above, although embodiment of this invention was described in detail, the scope of the present invention is not limited to this, and various correction and deformation | transformation are within the range which does not deviate from the technical idea of this invention described in the claim. It will be apparent to those having ordinary knowledge in the art.

DESCRIPTION OF SYMBOLS 100 Coil electronic component 101 Body 102 Display part 103 Sheet 104 Coil pattern B Base area M Marking area

Claims (14)

A body including a coil pattern;
A display unit formed on a surface of the body, having a base region, and a marking region formed by a white pigment on a part of the base region;
Including coil electronic components.   The coil electronic component according to claim 1, wherein the marking region is formed so as to fill a groove formed on an upper surface of the base region.   The coil electronic component according to claim 2, wherein an upper surface of the marking region and an upper surface of the base region are coplanar.   The coil electronic component according to claim 1, wherein the base region is made of a darker material than the marking region.   The coil electronic component according to claim 4, wherein the base region is black. The coil electronic component according to claim 1, wherein the white pigment is TiO ₂ .   The coil electronic component according to claim 1, wherein the marking area is formed by a paste printed on the base area. The coil electronic component according to claim 7, wherein the paste includes TiO ₂ powder and glass. The coil electronic component according to claim 8, wherein the TiO ₂ powder has a BET of 5.0 m ² / g or more. The coil electronic component according to claim 8, wherein the TiO ₂ powder is contained in the paste in an amount of 20-22%.   The coil electronic component according to claim 1, wherein the body has a length and a width smaller than 6 mm and 3 mm, respectively.   The coil electronic component according to claim 1, wherein a plurality of the coil patterns are provided and laminated.   The coil electronic component according to claim 1, wherein the base region includes a magnetic material and a black pigment.   The coil electronic component according to claim 13, wherein the body includes a magnetic material included in the base region.

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