JP7632863B2 - Coil device and method for manufacturing same - Google Patents

Description

The present invention relates to a coil device and a manufacturing method thereof, and in particular to a coil device having a terminal portion for external connection and a manufacturing method thereof.

Conventionally, coil devices have been used as electronic components such as noise filters.

Figure 8 (A) is an exploded perspective view showing the configuration of the noise filter 100 described in Patent Document 1, and Figure 8 (B) is a perspective view showing the configuration of the noise filter 100.

Referring to Fig. 8(A) and Fig. 8(B), the noise filter 100 has a base 102, a magnetic core 101 fixed to the base 102, and a winding 104 wound around the magnetic core 101. Here, two windings 104 are wound around the magnetic core 101.

As shown in FIG. 8(A), the lower end 105 is formed by linearly forming the vicinity of the lower end of the winding 104, and the upper end 106 is formed by linearly forming the vicinity of the upper end of the winding 104.

Four conductive pins 103 are arranged at the four corners of the lower end of the base 102. The conductive pins 103 are the parts that become the terminals when mounting the noise filter 100.

The magnetic core 101 is fixed to the base 102 with the rectangular wire 104 wound edgewise. The lower end 105 is soldered to a conductive pin 103 located on the front side of the base 102. The upper end 106 is soldered to a conductive pin 103 located on the rear side of the base 102.

JP 2019-110186 A

However, the noise filter 100 configured as described above had room for improvement in terms of its configuration and manufacturing method.

Specifically, as shown in FIG. 8B, the lower end 105 and upper end 106, which are the terminals of the winding 104, have different lengths. In other words, the upper end 106, which is routed from the top end of the winding 104 to the bottom, is formed to be longer than the lower end 105. Therefore, the process of routing the upper end 106 is not simple.

In addition, in order to straighten the long upper end 106, a forming process is required to unwind the arc-shaped winding 104, which complicates the manufacturing process and increases manufacturing costs.

Furthermore, the upper end 106 and the lower end 105 are temporarily connected to the conductive pin 103 by winding, but there is an issue in that the task of winding the rectangular wire around the conductive pin 103 is not easy.

The present invention was made in consideration of the above circumstances, and the object of the present invention is to provide a coil device and a manufacturing method thereof in which the configuration of the terminal portion for external connection is optimized.

The coil device of the present invention comprises a coil having a coil portion made of a wound conductor, a core having a winding portion around which the coil is wound, a base for fixing the core, and a terminal portion electrically connected to the coil, the terminal portion having a front terminal portion connected to a lower terminal of the coil and positioned on the front side, and a rear terminal portion connected to an upper terminal of the coil and positioned on the rear side, the front terminal portion and the rear terminal portion having different lengths, the terminal portion having a vertical portion and a horizontal portion, and the terminal of the coil being clamped between the horizontal portion and the base .

In addition, the coil device of the present invention comprises a coil having a coil portion made of a wound conductor, a core having a winding portion around which the coil is wound, a base for fixing the core, and a terminal portion electrically connected to the coil, the terminal portion having a front terminal portion connected to a lower terminal of the coil and positioned on the front side, and a rear terminal portion connected to an upper terminal of the coil and positioned on the rear side, the front terminal portion and the rear terminal portion having different lengths, the terminal portion having a vertical portion and a horizontal portion, a gap for temporarily fixing the terminal of the coil is formed between the horizontal portion and the base, and the terminal of the coil is inserted through the gap only once .

In addition, in the coil device of the present invention, the base has a pedestal and a back plate, the core is fixed onto the pedestal along the back plate, and the length of the upper terminal from the coil portion of the coil to the rear terminal portion is less than half the outer circumferential length of the coil portion of the coil .

In the coil device of the present invention, the rear terminal portion is inserted through the inside of the back plate of the base .

In the coil device of the present invention, the winding portion is formed in a straight line, and the coil is configured by edgewise winding a rectangular wire .

The coil device of the present invention is also characterized in that the horizontal portion of the terminal portion faces the back plate of the base.

In the coil device of the present invention, the core is a continuous closed magnetic core having a linear first winding portion and a linear second winding portion, the coil has a first coil wound around the first winding portion and a second coil wound around the second winding portion and having an opposite winding direction to the first coil, the front terminal portion has a first front terminal portion connected to a lower terminal of the first coil and a second front terminal portion connected to a lower terminal of the second coil, and the rear terminal portion has a first rear terminal portion connected to an upper terminal of the first coil and a second rear terminal portion connected to an upper terminal of the second coil.

The present invention is also a method for manufacturing a coil device comprising: a coil having a coil portion made of a wound conductor; a core having a winding portion around which the coil is wound; a base for fixing the core; and a terminal portion electrically connected to the coil, the terminal portion having a front terminal portion connected to a lower terminal of the coil and disposed on the front side, and a rear terminal portion connected to an upper terminal of the coil and disposed on the rear side , the front terminal portion and the rear terminal portion having different lengths, and the terminal portion having a vertical portion and a horizontal portion, the method comprising the steps of: preparing the core around which the coil is wound and the base in which the front terminal portion and the rear terminal portion are incorporated; incorporating the core into the base; temporarily fixing the terminals of the coil by clamping or inserting them between the horizontal portion and the base; and electrically connecting the front terminal portion and the rear terminal portion to the coil.

According to the coil device of the present invention, the front terminal portion and the rear terminal portion have different lengths, and by extending the long terminal portion to the end of the coil, the reliability of the connection between the front terminal portion and the rear terminal portion and the coil end can be improved. Also, by clamping the end of the coil between the horizontal portion of the terminal portion and the base, the end of the coil can be easily connected to the terminal portion.

According to the coil device of the present invention, the front terminal portion and the rear terminal portion have different lengths, and by extending the long terminal portion to the end of the coil, the reliability of the connection between the front terminal portion and the rear terminal portion and the coil end can be improved. Also, the end of the coil can be temporarily fixed by inserting it between the horizontal portion of the terminal portion and the base, and the end of the coil can be easily connected to the terminal portion.

According to the coil device of the present invention, the length of the upper terminal of the coil is less than half the outer circumferential length of the coil portion, so that the upper terminal can be shortened and forming work for unwinding the upper terminal of the coil can be eliminated.

According to the coil device of the present invention, the rear terminal portion is inserted through the inside of the back plate of the base, so that the rear terminal portion, which is formed relatively long, can be protected by the back plate.

According to the coil device of the present invention, the end of a coil formed by edgewise winding of a rectangular wire can be easily connected to a terminal portion, and further, the connection reliability between the end of the coil and the terminal portion can be improved.

According to the coil device of the present invention, the horizontal portion of the terminal portion faces the rear side of the rear plate of the base, improving the insulation of the horizontal portion. Furthermore, when soldering the upper terminal of the coil to the horizontal portion of the terminal portion, the horizontal portion and the upper terminal can be pressed against the rear plate with a soldering iron, making the solder connection reliable and easy.

The coil device of the present invention can be used as a line filter by having a closed magnetic core, a first coil, and a second coil.

According to the manufacturing method of the coil device of the present invention, the front terminal portion and the rear terminal portion are different in length, and the terminal portion is formed long, so that it can be extended to the end of the coil, which makes it possible to eliminate the forming work of unraveling the end of the coil for connection and to simplify the coil connection work. Furthermore, the end of the coil can be temporarily fixed by clamping or inserting it between the horizontal part of the terminal portion and the base, and can be electrically connected in this state.

1A and 1B are diagrams showing a coil device according to an embodiment of the present invention, in which FIG. 1A is a perspective view of the coil device as seen from the front, and FIG. 1B is a perspective view of the coil device as seen from the rear. FIG. 2 is a diagram showing a coil device according to an embodiment of the present invention, and is a perspective view showing a core and a coil after the coil is wound. 1A and 1B are diagrams showing a base of a coil device according to an embodiment of the present invention, in which FIG. 1A is a perspective view of the base as seen from the front, and FIG. 1B is a perspective view of the base as seen from the rear. 1A and 1B are diagrams showing a coil device for one embodiment of the present invention, in which (A) is an oblique view showing the connection configuration between the upper terminal of the second coil and the horizontal portion of the second rear terminal portion, and (B) is an oblique view showing the connection configuration between the lower terminal of the second coil and the horizontal portion of the second front terminal portion. FIG. 2 is a diagram showing a coil device according to an embodiment of the present invention, and is a top view showing an example of the wire length of an upper terminal which is an end portion of the coil. 1A to 1D are diagrams showing a coil device according to an embodiment of the present invention, and are diagrams showing the configurations of a base at a connection portion of a terminal portion. FIG. 2 is a diagram showing a coil device according to an embodiment of the present invention, illustrating the configuration of a base. 1A and 1B are diagrams showing a coil device according to the background art, in which FIG. 1A is an exploded perspective view, and FIG.

The coil device 10 according to an embodiment of the present invention and its manufacturing method will be described in detail below with reference to the drawings. In the following description, the same components are generally designated by the same reference numerals, and repeated description will be omitted.

Figure 1(A) is a perspective view of the coil device 10 seen from the front, and Figure 1(B) is a perspective view of the coil device 10 seen from the rear.

Referring to FIG. 1(A) and FIG. 1(B), the coil device 10 mainly includes a core 11, a coil 12, a base 13, and a terminal portion 19. The coil device 10 can be used, for example, as a line filter, a noise filter, a common mode noise filter, a transformer, etc. The coil device 10 is also a mounting component that is mounted on a mounting surface of a mounting board or the like. The mounting structure of the coil device 10 can be a plug or solder welding, etc. Furthermore, as described later, the first coil 121 and the second coil 122 have conductors wound approximately perpendicular to the mounting surface of the coil device 10.

The core 11 has a generally rectangular frame shape when viewed from the front. The material of the core 11 may be a magnetic material such as an amorphous alloy, silicon steel plate, or ferrite. Details of the core 11 will be described later with reference to FIG. 2.

The coil 12 is made of a wound conductor. Specifically, the coil 12 is made of a rectangular wire wound edgewise. The surface of the conductor that constitutes the coil 12 is coated with a thin resin film (e.g., a film made of urethane resin). Here, the coil 12 is made of a first coil 121 and a second coil 122, the details of which will be described later with reference to FIG. 2.

The base 13 is a member made of synthetic resin or the like that is configured to fix the core 11, and its configuration will be described later with reference to FIG. 3.

The terminal portion 19 is a connection means electrically connected to the coil 12 and disposed at the lower end of the coil device 10. The terminal portion 19 is formed by bending a conductor made of copper, aluminum, or the like. Specifically, the terminal portion 19 has a first front side terminal portion 191 connected to the lower terminal 126 of the first coil 121, a second front side terminal portion 192 connected to the lower terminal 124 of the second coil 122, a first rear side terminal portion 193 connected to the upper terminal 125 of the first coil 121, and a second rear side terminal portion 194 connected to the upper terminal 123 of the second coil 122. Details of each of these terminal portions will be described with reference to FIG. 4, etc.

In this embodiment, the first front terminal portion 191 and the second front terminal portion 192 are different in length from the first rear terminal portion 193 and the second rear terminal portion 194. Here, the first rear terminal portion 193 and the second rear terminal portion 194 are formed to be longer than the first front terminal portion 191 and the second front terminal portion 192. In this way, as described below, the upper terminals of the first coil 121 and the second coil 122 can be shortened. This will be described later with reference to FIG. 2.

Figure 2 is an oblique view showing the core 11 and coil 12.

The core 11 is a continuous closed magnetic core having a winding portion 17 consisting of a linear first winding portion 171 and a linear second winding portion 172. The first winding portion 171 and the second winding portion 172 are substantially perpendicular to the mounting surface of the coil device 10, which is not shown here.

The coil 12 has a first coil 121 wound around a first winding section 171, and a second coil 122 wound around a second winding section 172 and having an opposite winding direction to the first coil 121. The first coil 121 and the second coil 122 have the same cross-sectional shape (conductor width, conductor thickness) and number of turns of the conductor. In this way, the coil device 10 including the first coil 121 and the second coil 122 can be used as a noise filter, as described above. In addition, the coil parts 127 and 128 are approximately perpendicular to the mounting surface of the coil device 10, which is not shown here.

The first coil 121 has a coil section 127 consisting of a conductor wound around the first winding section 171, an upper terminal 125 formed by unwinding the conductor at the upper end of the coil section 127, and a lower terminal 126 formed by unwinding the conductor at the lower end of the coil section 127.

The second coil 122 has a coil section 128 made of a conductor wound around the second winding section 172, an upper terminal 123 formed by unwinding the conductor at the upper end of the coil section 128, and a lower terminal 124 formed by unwinding the conductor at the lower end of the coil section 128. Coil sections 127 and 128 have approximately the same outer diameter and outer periphery.

Figure 3(A) is a perspective view of the base 13 seen from the front, and Figure 3(B) is a perspective view of the base 13 seen from the rear.

Referring to FIG. 3(A), the base 13 has a pedestal 131 and a back plate 132. The core 11 shown in FIG. 2 is fixed onto the pedestal 131 along the back plate 132.

The protrusion 133 is formed by protruding the center of the front surface of the back panel 132 forward so that it is vertically long in the up-down direction. The protrusion 133 is fitted into the central opening of the core 11 described above.

The recessed portions 134 are formed by partially recessing the front surface of the back plate 132 into a roughly elliptical shape. Here, the recessed portions 134 are formed on the upper left, upper right, and lower center of the front surface of the back plate 132. By forming the recessed portions 134, the amount of resin required to manufacture the base 13 can be reduced, leading to lower costs.

The left support part 138 and the right support part 139 are parts that protrude upward from both the left and right ends of the base 131. The inner side surfaces of the left support part 138 and the right support part 139 are curved in accordance with the shape of the core 11. The left support part 138 and the right support part 139 can hold the aforementioned core 11 in the left and right directions.

Referring to FIG. 3B, the vertically extending portions (vertical portions 195, described below with reference to FIG. 4A) of the first rear terminal portion 193 and the second rear terminal portion 194 pass through the inside of the rear plate 132 of the base 13. In this manner, the first rear terminal portion 193 and the second rear terminal portion 194 can be firmly supported by the base 13, and insulation between the first rear terminal portion 193 and the second rear terminal portion 194 can be ensured.

Figure 4 (A) is a perspective view showing the connection configuration between the upper terminal 123 of the second coil 122 and the horizontal portion 196 of the second rear terminal portion 194, and Figure 4 (B) is a perspective view showing the connection configuration between the lower terminal 124 of the second coil 122 and the horizontal portion 198 of the second front terminal portion 192.

Referring to FIG. 4A, the second rear side terminal portion 194 is composed of a vertical portion 195 and a horizontal portion 196. In other words, the second rear side terminal portion 194 has a middle portion bent at an approximately right angle. The lower end of the vertical portion 195 is exposed downward from the lower end of the base 13. The horizontal portion 196 faces the rear surface (opposing surface 135) of the back plate 132 of the base 13. The second rear side terminal portion 194 is formed longer than the first front side terminal portion 191 and the like described above. Therefore, the horizontal portion 196, which is the upper end of the second rear side terminal portion 194, can be disposed near the upper end of the second coil 122, and the wire length of the upper terminal 123 can be shortened.

The upper terminal 123 of the second coil 122 is inserted or clamped between the horizontal portion 196 and the rear surface of the rear plate 132. The connection between the upper terminal 123 and the horizontal portion 196 is welded with solder (not shown). The configuration in which the upper terminal 123 is inserted or clamped will be described later with reference to Figures 6 and 7.

By doing this, the upper terminal 123 and the horizontal portion 196 can be firmly connected. Furthermore, since the horizontal portion 196 of the second rear terminal portion 194 is disposed near the upper end portion of the second coil 122, the upper terminal 123 can be made as short as the lower terminal 124 described below. In addition, the connection structure between the upper terminal 125 of the first coil 121 and the first rear terminal portion 193 shown in FIG. 1(B) is the same as the connection structure shown in FIG. 4(A).

Referring to FIG. 4(B), the second front terminal portion 192 has a vertical portion 197 and a horizontal portion 198. The lower terminal 124 of the second coil 122 is sandwiched or inserted between the horizontal portion 198 and the front surface (opposing surface 135) of the base 131. Furthermore, the connection portion between the horizontal portion 198 and the lower terminal 124 is welded with solder (not shown). This type of connection structure is also the same for the first front terminal portion 191 and the lower terminal 126 of the first coil 121 shown in FIG. 1(A).

Figure 5 is a diagram showing an example of the wire length of the upper terminal 123. The length L11 of the upper terminal 123 obtained by unwinding the upper end of the second coil 122 is preferably less than half the outer circumferential length L10 of the coil portion 128. Here, the length L11 of the upper terminal 123 is the length from the unwinding portion P1 of the second coil 122 to the portion P2 where the upper terminal 123 connects to the horizontal portion 196 of the second rear terminal portion 194. This length is approximately the same as the distance L13 between the end face of the second winding portion 172 near the upper end of the coil portion 128 and the horizontal portion 196.

The same applies to the other terminals, upper terminal 125, lower terminal 124, and lower terminal 126. In this way, the length to be unwound can be shortened to make upper terminal 123 etc. substantially straight, simplifying the manufacturing process and reducing manufacturing costs.

More preferably, this effect can be enhanced by setting the length L11 of the upper terminal 123, which is the unwound upper end of the second coil 122, to 1/3 or less of the outer circumferential length L10 of the coil portion 128. The same applies to the other terminals, that is, the upper terminal 125, the lower terminal 124, and the lower terminal 126.

Figures 6(A), 6(B), 6(C) and 6(D) are diagrams showing various forms of the relative configuration of the facing surface 135 between the horizontal portion of each terminal and the horizontal portion of the base 13. In each diagram in Figure 6, the upper terminals and lower terminals shown in Figure 4 are clamped between the facing surface 135 and each horizontal portion.

Referring to FIG. 6(A), the opposing surface 135 on the front surface of the base 13 and the horizontal portion 198 are approximately parallel. The distance L12 between the opposing surface 135 and the horizontal portion 198 is equal to or less than the width (thickness) of the lower terminal 124 shown in FIG. 4(B). In this way, the lower terminal 126 can be clamped between the opposing surface 135 and the horizontal portion 198.

Referring to FIG. 6(B), here, the facing surface 135 on the front surface of the base 13 is inclined relative to the horizontal portion 198. Specifically, the facing surface 135 is an inclined surface that inclines rearward toward the left, which is the outer side in the left-right direction. In this way, the lower terminal 126 can be suitably clamped between the inclined facing surface 135 and the horizontal portion 198.

Referring to FIG. 6(C), here, the opposing surface 135 facing the horizontal portion 196 is partially protruded backward to form the protrusion 136. The protrusion 136 may be formed in a dot shape, or in a linear shape that extends continuously in the left-right direction. The tip of the protrusion 136 may be disposed near the horizontal portion 196, or may be in contact with the horizontal portion 196. In this way, the upper terminal 123 shown in FIG. 4(A) can be more firmly clamped between the protrusion 136 and the horizontal portion 196.

Referring to FIG. 6(D), here, the facing surface 135 of the portion facing the horizontal portion 196 is recessed forward to form the concave portion 137. In this way, the upper terminal 125 is clamped in a curved state between the horizontal portion 196 and the concave portion 137, so that the upper terminal 125 can be clamped more firmly.

The configurations shown in Figures 6(A) to 6(D) can be applied to all the connection parts shown in Figure 1. That is, they can be applied to the connection structure between the lower terminal 124 and the second front terminal 192 shown in Figure 1(A), the connection structure between the lower terminal 126 and the first front terminal 191 shown in Figure 1(A), the connection structure between the first rear terminal 193 and the upper terminal 125 shown in Figure 1(B), and the connection structure between the second rear terminal 194 and the upper terminal 123.

With reference to FIG. 7, another form of the portion where the horizontal portion 198 and the lower terminal 126 are connected will be described. Here, the distance L12 between the opposing surface 135 on the front surface of the base 13 and the rear surface of the horizontal portion 198 is longer than the width (thickness) of the lower terminal 126. In this way, the lower terminal 126 is inserted between the opposing surface 135 and the horizontal portion 198. Even with this configuration, the horizontal portion 198 and the lower terminal 126 can be electrically connected and the position of the lower terminal 126 can be fixed by welding with solder. Also, even with this configuration, the lower terminal 126 can be temporarily fixed by being inserted between the opposing surface 135 and the horizontal portion 198 in the manufacturing process.

Based on Figures 1 to 4, and with reference to the above-mentioned figures, a method for manufacturing a coil device 10 having the configuration shown in Figure 1 etc. will be described.

Referring to FIG. 2, a first coil 121 and a second coil 122 are wound around the core 11. In addition, an upper terminal 125 and a lower terminal 126 are formed at the upper and lower ends of the first coil 121 by unwinding the conductor wire. An upper terminal 123 and a lower terminal 124 are formed at the upper and lower ends of the second coil 122 by unwinding the conductor wire.

The core 11 is assembled from the front into the base 13 shown in FIG. 3(A). At this time, the protrusion 133 of the base 13 is inserted into the central opening of the core 11. The lower end of the core 11 is supported from the outside in the left-right direction by the left support part 138 and the right support part 139. The terminal parts 19 for connecting each end of the coil 12 are pre-assembled to the base 13, and a predetermined gap is provided between each horizontal part (196, 198) of each terminal and the opposing surface 135 of the base.

Referring to FIG. 4(B), the lower terminal 124 is clamped or inserted between the horizontal portion 198 of the second front terminal portion 192 and the front surface of the base 131, and the horizontal portion 198 and the lower terminal 124 are pressed against each other with a soldering iron to melt the resin film covering the periphery of the lower terminal 124, followed by solder welding. This electrically connects the lower terminal 124 to the horizontal portion 198. A similar process is also used to electrically connect the horizontal portion 198 of the first front terminal portion 191 shown in FIG. 1(A) to the lower terminal 126.

Referring to FIG. 1B, in the same manner as in the case of the horizontal portion 198 of the second front terminal portion 192 described above, the horizontal portion 196 of the second rear terminal portion 194 is connected to the upper terminal 123. Furthermore, the horizontal portion 196 of the first rear terminal portion 193 is connected to the upper terminal 125.

The above process produces the coil device 10 shown in Figure 1.

The above-described embodiment provides the following major advantages:

Referring to FIG. 1(B), according to the coil device 10 of the present invention, the first front terminal portion 191 and the second front terminal portion 192 are different in length from the first rear terminal portion 193 and the second rear terminal portion 194, so that the long first rear terminal portion 193 and the second rear terminal portion 194 are extended to the vicinity of the upper end of the coil 12. As a result, as shown in FIG. 4(A), the upper terminal 123 can be shortened, and the connection reliability can be improved. Furthermore, after connecting the upper terminal 123 of the second coil 122 to the horizontal portion 196, there is no need to perform post-processing such as terminal bending on the horizontal portion 196, so that the elimination of these operations can reduce production costs.

Referring further to FIG. 5, the length of the upper terminal 123 of the coil 12 is less than half the outer circumferential length of the coil portion 128, so that the upper terminal 123 can be shortened, and the forming work for unwinding the upper terminal 123 of the coil 12 can be simplified or eliminated.

Referring further to FIG. 3B, the first rear terminal portion 193 and the second rear terminal portion 194 are inserted through the inside of the back plate 132 of the base 13, so that the first rear terminal portion 193 and the second rear terminal portion 194, which are formed relatively long, can be protected by the back plate 132 and have improved insulation.

Referring to FIG. 1(A), the ends of the first coil 121 and the second coil 122, which are formed by edgewise winding flat wire, can be easily connected to the first front terminal portion 191 and the second rear terminal portion 194, thereby improving connection reliability.

Referring to FIG. 4(A), the upper terminal 123 of the second coil 122 can be clamped between the horizontal portion 196 of the second rear terminal portion 194 and the base 13, thereby firmly connecting the upper terminal 123 to the terminal portion 19. Furthermore, in the manufacturing process of the coil device 10, the upper terminal 123 can be temporarily fixed by clamping or inserting it between the horizontal portion 196 and the base 13, and solder connection can be performed in this state.

Referring to FIG. 4(A), the horizontal portion 196 of the second rear terminal portion 194 faces the rear plate 132 of the base 13, thereby improving the insulation of the horizontal portion 196. Furthermore, when soldering the upper terminal 123 to the horizontal portion 196, the horizontal portion 196 and the upper terminal 123 can be pressed against the rear plate 132 with a soldering iron, allowing the soldering connection to be performed reliably and easily.

Referring to FIG. 1(A), it can be used as a line filter by further having a closed magnetic core, a first coil 121 and a second coil 122.

Referring to FIG. 1B, in the manufacturing method, the long first rear terminal portion 193 and the second rear terminal portion 194 are extended to the vicinity of the upper end of the coil 12, which eliminates the need for a forming operation to loosen the ends of the coil 12 for connection, and simplifies the connection structure and connection operation of the coil 12.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and modifications can be made without departing from the spirit of the present invention. In addition, the above-mentioned embodiments can be combined with each other.

For example, referring to FIG. 3B, in the above embodiment, the first rear terminal portion 193 and the second rear terminal portion 194 are inserted inside the rear plate 132 of the base 13, but the first rear terminal portion 193 and the second rear terminal portion 194 can also be incorporated into the rear plate 132 by other structures. For example, a groove-shaped region extending in the vertical direction can be formed on the rear surface of the rear plate 132, and the first rear terminal portion 193 and the second rear terminal portion 194 can be fitted into this groove-shaped region.

Furthermore, referring to FIG. 1(A), in this embodiment, a rectangular core is used as the core 11, but it is also possible to use a core with another shape as the core 11, for example, it is also possible to use an annular core as the core 11. It is also possible to provide only one coil and use it as an inductor.

10...coil device, 11...core, 12...coil, 121...first coil, 122...second coil, 123...upper terminal, 124...lower terminal, 125...upper terminal, 126...lower terminal, 127...coil portion, 128...coil portion, 13...base, 131...pedestal, 132...back plate, 133...protruding portion, 134...thin part, 135...opposing surface, 136...projecting portion, 137...concave portion, 138...left support portion, 139...right support portion, Reference Signs List 17...winding portion, 171...first winding portion, 172...second winding portion, 19...terminal portion, 191...first front terminal portion, 192...second front terminal portion, 193...first rear terminal portion, 194...second rear terminal portion, 195...vertical portion, 196...horizontal portion, 197...vertical portion, 198...horizontal portion, 100...noise filter, 101...magnetic core, 102...base, 103...conductive pin, 104...winding, 105...lower end portion, 106...upper end portion

Claims (8)

a coil having a coil portion made of a wound conductive wire;
a core having a winding portion around which the coil is wound;
A base for fixing the core;
A terminal portion electrically connected to the coil,
the terminal portion includes a front terminal portion connected to a lower terminal of the coil and disposed on a front side, and a rear terminal portion connected to an upper terminal of the coil and disposed on a rear side,
The front terminal portion and the rear terminal portion have different lengths,
The terminal portion has a vertical portion and a horizontal portion,
The terminal of the coil is sandwiched between the horizontal portion and the base.
A coil device comprising: a coil having a coil portion made of a wound conductive wire;
a core having a winding portion around which the coil is wound;
A base for fixing the core;
A terminal portion electrically connected to the coil,
the terminal portion includes a front terminal portion connected to a lower terminal of the coil and disposed on a front side, and a rear terminal portion connected to an upper terminal of the coil and disposed on a rear side,
The front terminal portion and the rear terminal portion have different lengths,
The terminal portion has a vertical portion and a horizontal portion,
a gap is formed between the horizontal portion and the base for temporarily fixing an end of the coil;
The end of the coil passes through the gap only once.
A coil device comprising: The base includes a base and a back panel.
The core is fixed on the base along the back plate,
3. The coil device according to claim 1, wherein a length of the upper end from the coil portion of the coil to the rear terminal portion is equal to or less than half a circumferential length of the coil portion of the coil. The coil device according to claim 3 , wherein the rear terminal portion is inserted through the inside of the back plate of the base. The winding portion is formed linearly,
5. The coil device according to claim 1 , wherein the coil is formed by edgewise winding a rectangular wire. 6. The coil device according to claim 3 , wherein the horizontal portion of the terminal portion faces a rear plate of the base. the core is a continuous closed magnetic core having a linear first winding portion and a linear second winding portion,
The coil includes a first coil wound around the first winding portion and a second coil wound around the second winding portion and having a winding direction opposite to that of the first coil,
the front terminal portion includes a first front terminal portion connected to a lower terminal of the first coil and a second front terminal portion connected to a lower terminal of the second coil,
A coil device as described in any one of claims 1 to 6, characterized in that the rear terminal portion has a first rear terminal portion connected to an upper terminal of the first coil and a second rear terminal portion connected to an upper terminal of the second coil. a coil device including a coil having a coil portion made of a wound conductor, a core having a winding portion around which the coil is wound, a base for fixing the core, and a terminal portion electrically connected to the coil, the terminal portion having a front terminal portion connected to a lower terminal of the coil and disposed on the front side, and a rear terminal portion connected to an upper terminal of the coil and disposed on the rear side, the front terminal portion and the rear terminal portion having different lengths, and the terminal portion having a vertical portion and a horizontal portion ,
preparing the core around which the coil is wound and the base on which the front terminal portion and the rear terminal portion are assembled;
incorporating the core into the base;
a step of temporarily fixing an end of the coil by clamping or inserting the end of the coil between the horizontal portion and the base;
and electrically connecting the front terminal portion and the rear terminal portion to the coil.

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