JP2017152619A - Surface-mounted inductor and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface-mounted inductor in which manufacturing information with high visibility is written and a method of manufacturing the same.SOLUTION: The surface-mounted inductor includes: a coil having a bilaterally symmetrical shape; and an element body containing the coil and containing magnetic powder. The coil is incorporated in the element body so that a winding shaft is parallel to a mounting surface of the element body, a lead end portion of the coil extends to a surface of the mounting surface, and the element body is provided with an optical reading code or a reading code by unevenness on one side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a small-sized surface-mount inductor and a method for manufacturing the same, and more particularly to markings marked on the surface-mount inductor.

  In recent years, with the miniaturization of electronic components, a method of writing manufacturing information on the surface of the small electronic components is required. In Patent Document 1, a part of the upper surface of an electronic component is used for polarity display, and the region used for polarity display is divided into grids, and each grid is filled with paint or a sign such as a slash is written. A method is disclosed.

JP-A-6-325967

  In the electronic component of Patent Document 1, since polarity display and manufacturing information are written on the same surface, a space for describing manufacturing information is narrow and visibility is low.

  Accordingly, an object of the present invention is to provide a surface mount inductor in which manufacturing information with high visibility is written and a manufacturing method thereof.

  The surface-mount inductor of the present invention is a surface-mount inductor comprising a coil having a symmetrical shape and an element body containing the coil and containing magnetic powder. It is built in the element body so as to be parallel, and the lead-out end of the coil extends to the surface of the mounting surface, and the element body has an optical reading code or a reading code by unevenness on one side. It is characterized by.

  According to the surface mount inductor of the present invention, it is possible to provide a surface mount inductor in which manufacturing information with high visibility is written. Further, according to the method for manufacturing a surface mount inductor of the present invention, the surface mount inductor can be efficiently manufactured.

It is a perspective view of the coil used in Example 1 of the present invention. It is a perspective view of the magnetic body core used in Example 1 of this invention. It is a perspective view of the block used in Example 1 of the present invention. It is a top view of the mounting surface of the block used in Example 1 of this invention. It is sectional drawing for demonstrating the process of inserting a magnetic body core in the coil of the surface mount inductor of Example 1 of this invention. It is sectional drawing for demonstrating the process of sealing a coil and a magnetic body core with a block of the surface mount inductor of Example 1 of this invention. It is sectional drawing for demonstrating the process of forming the element | base_body by compressing and heating a block of the surface mount inductor of Example 1 of this invention. It is a top view of the mounting surface of an element | base_body for demonstrating the process of forming the external terminal of the surface mount inductor of Example 1 of this invention. It is a top view of the upper surface of the surface mount inductor in which the manufacture time was written in Example 1 of the present invention. It is a top view of the upper surface of the surface mount inductor in which the manufacturing place was written in Example 1 of the present invention. It is sectional drawing for demonstrating the process of sealing a coil and a magnetic body core with the block of the surface mount inductor of Example 2 of this invention. It is a top view of the upper surface of the surface mount inductor with which the manufacture time was written of Example 2 of this invention. It is a top view of the upper surface of the surface mount inductor in which the manufacturing place of Example 2 of this invention was written. It is a top view of the upper surface of the surface mount inductor in which the manufacture time and manufacture place of the Example of this invention were written.

  Hereinafter, a first embodiment of a surface mount inductor and a manufacturing method thereof according to the present invention will be described with reference to FIGS.

The coil used in Example 1 is demonstrated using FIG. FIG. 1 is a perspective view of a coil used in the first embodiment. As shown in FIG. 1, the coil 2 is a left-right symmetrical air core coil formed by winding a rectangular wire having an insulating coating so that both ends thereof are positioned on the outer periphery. A cylindrical air core is formed inside the coil 2.
The coil 2 is wound with the first winding part wound in two steps so that both ends of the flat wire are located on the outer periphery and the first winding part wound in a direction opposite to each other along the winding axis of the coil 2. 2 winding portions. A lead-out end portion 2a that is an end portion of a flat wire is drawn out from the outer periphery of each second winding portion. The lead-out end portions 2a are each drawn perpendicularly to the winding axis of the coil 2 and in opposite directions to form a U-shape.
Since the coil 2 formed in this way is parallel to the winding axis direction and the wide surface of the flat wire, no mechanical stress is applied to the flat wire.

  The magnetic core used in Example 1 will be described with reference to FIG. FIG. 2 is a perspective view of a magnetic core used in the first embodiment. As shown in FIG. 2, the magnetic core 3 has a shape in which two cylinders having different diameters are concentrically connected. Since the diameter of the bottom surface of each column is smaller than the diameter of the air core formed inside the coil 2, the magnetic core 3 can be inserted into the air core of the coil 2.

The element body of Example 1 will be described with reference to FIG. FIG. 3 is a perspective view of a block used in the first embodiment. The element body 4 is formed by combining two blocks 4a and heating and compressing them. The block 4a is formed by applying pressure to a sealing material including a filler having magnetic powder and an epoxy resin.
As shown in FIG. 3, the block 4 a has a rectangular parallelepiped shape having an opening on one end surface, and has a space for accommodating the coil 2 and the magnetic core 3 therein.
Two slits 4b each extending toward the side surface are provided on each side of the upper and lower surfaces of the block 4a. The slit 4b is released at the end face having the opening and is terminated at the opposite end face. The top surface and the bottom surface have the same shape, and one of them is the mounting surface 4c. In the embodiment of the present invention, the lower surface is the mounting surface 4c.

FIG. 4 is a plan view of the mounting surface of the block 3a used in the first embodiment. As shown in FIG. 4, the outline shape of the mounting surface 4b is a rectangle. Of the four sides constituting the rectangle, the side on the opening side is the short side, and the side orthogonal to the short side is the long side.
A portion between the two slits 4 b of the mounting surface 4 c is a support portion 4 h that supports the lead-out end portion 2 a of the coil 2. A U-shaped space is formed in the side view by the two slits 4b and the support portion 4h.

  A method for manufacturing the surface-mount inductor according to the first embodiment will be described with reference to FIGS. FIG. 5 is a cross-sectional view for explaining the process of inserting the magnetic core into the coil according to the first embodiment. FIG. 6 is a cross-sectional view for explaining a process of sealing the coil and the magnetic core with a block according to the first embodiment. FIG. 7 is a cross-sectional view for explaining a process of forming an element body by compressing and heating a block according to the first embodiment. FIG. 8 is a plan view of the mounting surface of the element body used in the first embodiment.

  As shown in FIG. 5, the magnetic cores 3 are inserted from both ends of the coil 2 in the winding axis direction. Then, as shown in FIG. 6A, the blocks 4a are arranged on both sides of the coil 2 so that the open ends face each other. And as shown in FIG.6 (b), the coil 2 is moved so that it may be settled in the inside of the two blocks 4a. Then, the leading end 2a of the coil 2 is pulled out from one slit 4b of the block 4a. The drawn-out end portion 2a is arranged so as to surround the outer circumference of the coil 2 and the support portion 4h, and forms a U shape in a side view.

A method for forming the element body will be described. As shown in FIG. 7A, a mold 5 and a lid 6 for forming an element body are prepared. The mold 5 has a rectangular parallelepiped shape having an opening on one end face, and has a space for accommodating the coil 2, the magnetic core 3, and the two blocks 4a therein. The bottom of the space of the mold 5 is a flat surface. The lid 6 has a flat plate shape and a flat bottom surface.
Two blocks 4 a with the mounting surface facing up are placed in the mold 6. Then, the lid 6 is put on from above, pressure and heat are applied, and the two blocks 4a are heated and compressed. As shown in FIG. 7B, the two blocks 4 a become an element body 4 including the coil 2 and the magnetic core 3.
Then, as shown in FIG. 8, the lead-out end 2 a of the coil 2 is fixed to the mounting surface of the element body 4 so as to be embedded so that the surface thereof is exposed on the surface of the mounting surface.

Next, a method for processing the lead end portion into the external terminal will be described.
The leading end 2a whose surface is exposed and extended on the mounting surface of the element body 4 is irradiated with laser to peel off the insulating coating. Since a rectangular wire is used, laser peeling conditions can be easily set, and all the external terminals are formed on the same surface, so that the process can be completed in one step. Then, the surface mount inductor 1 can be manufactured by forming the external terminal 7 by sputtering a predetermined metal on the lead end 2a.
In the surface mount inductor 1 manufactured in the first embodiment, the shape of the built-in coil 2 is symmetrical. In addition, since the distance from the extraction position of each extraction end 2a to the external terminal is the same, the electric characteristics are the same regardless of the current flowing from any external terminal. As described above, since the surface mount inductor 1 does not have polarity, marking indicating polarity is not necessary.

A method for writing manufacturing information will be described with reference to FIGS. FIG. 9 is a plan view of the upper surface of the surface-mount inductor in which the manufacturing time is written in the first embodiment. FIG. 10 is a plan view of the upper surface of the surface mount inductor in which the manufacturing location of the first embodiment is written.
The contour shape of the upper surface of the surface-mount inductor 1 is a rectangle. In the first embodiment, the manufacturing time from January to December and two manufacturing locations (manufacturing location 1, manufacturing location 2) are written as manufacturing information. As shown in FIG. 9, the manufacturing information related to the manufacturing period from January to December can be written with 12 types of markings 4d. The contour shape of the marking 4d is a rectangle as shown in FIGS. 9 (a) is January, FIG. 9 (b) is February, FIG. 9 (c) is March,... FIG. 9 (l) is December. Similarly, as the manufacturing information relating to the manufacturing location, as shown in FIG. 10, two types of markings 4e by laser are prepared. The marking 4e is a rectangle having a contour shape different from that of the marking 4d. 10A is the manufacturing place 1 and FIG. 10B is the manufacturing place 2. The manufacturing information written in this way is highly visible because it has a simple contour shape. Further, since the contour outlines of the marking 4d and the marking 4e are different, the production time and the production information can be accurately read regardless of the orientation of the surface mount inductor.

A second embodiment will be described with reference to FIGS.
FIG. 11 is a cross-sectional view for explaining a process of sealing the coil and the magnetic core with a block according to the second embodiment. FIG. 12 is a plan view of the upper surface of the surface-mount inductor in which the manufacturing time is written in the second embodiment. FIG. 13 is a plan view of the upper surface of the surface-mount inductor in which the manufacturing location is written according to the second embodiment.
In addition, the same number is attached | subjected to the same component as Example 1. FIG.

The same coil, magnetic core, block, element body, and lid as those in the first embodiment are used. As shown in FIG. 11, the mold 15 has a flat bottom surface inside, and a recess 15f on the bottom surface.
As shown in FIG. 11A, two blocks 4a each including the coil 2 and the magnetic core 3 are placed in a mold 15 with the mounting surface facing up. Next, by applying pressure to the block 4 a using the lid 6, and heating and compressing, the two blocks 4 a are pressed and formed into the element body 4 as shown in FIG. At this time, the recesses 15 f provided in the mold 15 cause unevenness on the upper surface of the element body 4. This unevenness is read as manufacturing information.
The manufacturing information is the same as in the first embodiment, the manufacturing period from January to December and the two manufacturing locations (manufacturing location 1, manufacturing location 2, manufacturing location 3). As shown in FIG. 12, twelve kinds of convex portions 4 f are prepared as manufacturing information related to the manufacturing period from January to December. The external shape of the convex part 4f is a rectangle as shown to Fig.12 (a)-(l). 12 (a) is January, FIG. 12 (b) is February, FIG. 12 (c) is March, and FIG. 12 (l) is December. Moreover, as for the manufacturing information regarding a manufacturing place, as shown in FIG. 13, two types of convex parts 4g are prepared. The convex portion 4g is a rectangle having an outer shape different from that of the convex portion 4f. FIG. 13A is the manufacturing location 1 and FIG. 13B is the manufacturing location 2.
For example, in an element body manufactured at the manufacturing site 1 in January, the convex portion 4f of FIG. 12A is formed on the left side of the upper surface of the element body 4, and FIG. The convex part 4g is formed. As described above, the mounting inductor 11 in which the manufacturing information about the manufacturing time and the manufacturing location is written can be manufactured by forming the unevenness according to the manufacturing information on the upper surface of the element body.

The surface-mount inductor manufactured in this way has high visibility of manufacturing information. Further, since the contour shapes of the convex portions 4f and the convex portions 4g are different, the production time and the production information can be accurately read regardless of the orientation of the surface mount inductor. Furthermore, since manufacturing information is printed simultaneously with the molding of the element body, it can be manufactured efficiently.
What is provided on the bottom surface inside the mold may not be a recess. Since it is sufficient that the top surface of the element to be molded is uneven, a convex portion may be provided on the bottom surface inside the mold.

Although the surface mount inductor and the manufacturing method thereof according to the present invention have been described above, the present invention is not limited to the contents described in the embodiments. It is good also as manufacturing information combining the marking by the laser of Example 1, and the convex part of Example 2. FIG. When the manufacturing time is written by marking with a laser and the manufacturing place is written by a convex portion, the manufacturing information can be read even when the manufacturing time and the manufacturing place are overwritten as shown in FIG. Further, even if the manufacturing time and the outer shape of the manufacturing place are the same, the manufacturing information can be read because there is a difference between the marking by the laser and the convex portion. The manufacturing information of the surface mount inductor manufactured as described above has high visibility because the space on the upper surface can be used twice. Similarly, the manufacturing time may be written by a convex portion and the manufacturing location may be written by laser marking.
The manufacturing information written in the element body is not limited to the upper surface, but may be another surface. Moreover, you may write in not only one surface but a several surface. In the embodiment, the outline shape of the manufacturing information is a rectangle, but is not limited to this, and may be a circle or other shapes.

DESCRIPTION OF SYMBOLS 1, 11 Surface mount inductor 2 Coil 2a Lead-out end part 3 Magnetic body cores 4, 14 Element body 4a Block 4b Slit 4c Mounting surface 4d, 4e Marking 4f, 4g Protrusion part 4h Support part 5, 15 Mold 15f Concave part 6 Cover 7 External terminal

Claims (7)

In a surface-mount inductor comprising a coil composed of a winding part and a lead-out end part, and an element body incorporating the coil,
The coil is built in the element body such that the winding axis is parallel to the mounting surface of the element body, and the lead-out end of the coil extends to the surface of the mounting surface,
The surface-mount inductor, wherein the element body is provided with an optical reading code or a reading code by unevenness on one surface. In a surface-mount inductor comprising a coil composed of a winding part and a lead-out end part, and an element body containing the coil and containing magnetic powder,
The element body has, on one side, an optical reading code, a reading code by unevenness,
A surface-mount inductor comprising:   The surface mount inductor according to claim 2, wherein the optical reading code partially overlaps the reading code by the unevenness. In a surface-mount inductor comprising a coil composed of a winding part and a lead-out end part, and an element body containing the coil and containing magnetic powder,
Forming the coil;
A step of incorporating the winding portion of the coil into the element body;
Heating and compressing the element;
Providing the element with an optical reading code;
A method for manufacturing a surface mount inductor, comprising: In a surface-mount inductor comprising a coil composed of a winding part and a lead-out end part, and an element body containing the coil and containing magnetic powder,
Forming the coil;
A step of incorporating the winding portion of the coil into the element body;
Heating and compressing the element body, and simultaneously giving a reading code by unevenness;
A method for manufacturing a surface mount inductor, comprising: In a surface-mount inductor comprising a coil composed of a winding part and a lead-out end part, and an element body containing the coil and containing magnetic powder,
Forming the coil;
A step of incorporating the winding portion of the coil into the element body;
Heating and compressing the element body, and simultaneously giving a reading code by unevenness;
Providing the element with an optical reading code;
A method for manufacturing a surface mount inductor, comprising: In the step of assigning an optical reading code to the element body,
The method for manufacturing a surface-mount inductor according to claim 6, wherein the optical reading code is provided so as to overlap with the reading code due to the unevenness.

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