Coil device and method for manufacturing same

Abstract

To provide a coil device with an optimized terminal configuration for an external connection terminal and a manufacturing method thereof.SOLUTION: A coil device 10 includes a coil 12 composed of wound conductors, a core 11 having a winding portion 17 around which the coil 12 is wound, a base 13 that fixes the core 11, and a terminal 19 electrically connected to the coil 12. Further, the terminal portion 19 includes a first front terminal 191 etc. that is connected to a lower terminal 124 etc. of the coil 12 and is arranged on the front side, and a first rear terminal 193, etc. that is connected to an upper terminal 123, etc. of the coil 12 and is arranged on the rear side, and further, the first front side terminal 191, etc. and the first rear side terminal 193, etc. have different lengths.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a coil device and a manufacturing method thereof, and more particularly to a coil device having a terminal portion for external connection and a manufacturing method thereof. [Background technology]

[0002] Conventionally, coil devices have been used as electronic components such as noise filters.

[0003] FIG. 8A is an exploded perspective view showing the configuration of a noise filter 100 described in Patent Document 1, and FIG. 8B is a perspective view showing the configuration of the noise filter 100. As shown in FIG.

[0004] 8(A) and 8(B), noise filter 100 has a base 102, a magnetic core 101 fixed to base 102, and a winding 104 wound around magnetic core 101. Here, two windings 104 are wound around magnetic core 101.

[0005] As shown in FIG. 8(A), a lower end 105 is formed by linearly forming a portion of the winding 104 near its lower end, and an upper end 106 is formed by linearly forming a portion of the winding 104 near its upper end.

[0006] Four conductive pins 103 are arranged at the four corners of the lower end of the base 102. The conductive pins 103 are portions that become terminals when the noise filter 100 is mounted.

[0007] The magnetic core 101 is fixed to the base 102 with the rectangular wire 104 wound edgewise. The lower end 105 is soldered to the conductive pin 103 arranged on the front side of the base 102. The upper end 106 is soldered to the conductive pin 103 arranged on the rear side of the base 102. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2019-110186 A Summary of the Invention [Problem to be solved by the invention]

[0009] However, the noise filter 100 having the above-mentioned configuration has room for improvement in terms of its configuration and manufacturing method.

[0010] 8(B), lower end 105 and upper end 106, which are ends of winding 104, have different lengths. That is, upper end 106, which is routed from the top end of winding 104 to the bottom, is formed to be longer than lower end 105. Therefore, the process of routing upper end 106 is not simple.

[0011] Furthermore, 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.

[0012] Furthermore, the temporary connection between upper end 106 and lower end 105 and conductive pin 103 is performed by winding, but there is a problem in that the task of winding a rectangular wire around conductive pin 103 is not easy.

[0013] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a coil device in which the configuration of a terminal portion for external connection is optimized, and a manufacturing method thereof. [Means for solving the problem]

[0014] The coil device of the present invention comprises 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, 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. The terminal portion has a vertical portion and a horizontal portion, and an end of the coil is sandwiched between the horizontal portion and the base. It is characterized by:

[0015] In addition, in the coil device of the present invention, The coil includes 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, 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, 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. It is characterized by:

[0016] In addition, in the coil device of the present invention, The base has a pedestal and a rear plate, the core is fixed on the pedestal along the rear plate, and the length of the upper terminal from the coil portion of the coil to the rear terminal portion is equal to or less than half the outer periphery of the coil portion of the coil. It is characterized by:

[0017] In addition, in the coil device of the present invention, The rear terminal portion is inserted through the inside of the rear plate of the base. It is characterized by:

[0018] In addition, 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. It is characterized by:

[0019] In the coil device of the present invention, the horizontal portion of the terminal portion faces a rear plate of the base.

[0020] In addition, in the coil device of the present invention, the core is a continuous closed magnetic core having linear first and second winding portions, 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 side terminal portion has a first front side terminal portion connected to a lower terminal of the first coil and a second front side terminal portion connected to a lower terminal of the second coil, and the rear side terminal portion has a first rear side terminal portion connected to an upper terminal of the first coil and a second rear side terminal portion connected to an upper terminal of the second coil.

[0021] The present invention also provides 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, 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. The terminal portion has a vertical portion and a horizontal portion. a step of preparing the core around which the coil is wound and the base to which the front terminal portion and the rear terminal portion are incorporated; and a step of 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 a step of electrically connecting the front terminal portion and the rear terminal portion to the coil. Effect of the Invention

[0022] 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 connection reliability between the front terminal portion and the rear terminal portion and the coil end can be improved. Furthermore, by clamping the terminal of the coil between the horizontal portion of the terminal portion and the base, the terminal of the coil can be easily connected to the terminal portion.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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, thereby improving the insulation of the horizontal portion. Furthermore, when soldering the upper end of the coil to the horizontal portion of the terminal portion, the horizontal portion and the upper end can be pressed against the rear plate with a soldering iron, making the soldering connection reliable and easy.

[0028] According to the coil device of the present invention, since it has a closed magnetic core, a first coil, and a second coil, it can be used as a line filter.

[0029] 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 by extending the long terminal portion to the end of the coil, it is possible to eliminate the need for a forming operation to unravel the end of the coil for connection and to simplify the coil connection operation. 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 electrically connected in this state. [Brief description of the drawings]

[0030] [Figure 1] 1A and 1B are diagrams showing a coil device according to an embodiment of the present invention, in which (A) is a perspective view of the coil device as seen from the front, and (B) is a perspective view of the coil device as seen from the rear. [Diagram 2] 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. [Diagram 3] 1A and 1B are diagrams showing a base of a coil device according to an embodiment of the present invention, in which (A) is a perspective view of the base as seen from the front, and (B) is a perspective view of the base as seen from the rear. [Figure 4] 1A and 1B are diagrams showing a coil device according to 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. [Diagram 5] 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. [Figure 6] 1A to 1D are diagrams showing a coil device according to an embodiment of the present invention, in which (A), (B), (C) and (D) are diagrams showing the configurations of the base at the connection portion of the terminal portion. [Figure 7] FIG. 2 is a diagram showing a coil device according to an embodiment of the present invention, illustrating the configuration of a base. [Figure 8] 1A and 1B are diagrams showing a coil device according to the background art, in which (A) is an exploded perspective view and (B) is a perspective view. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] A coil device 10 according to an embodiment of the present invention and a method for manufacturing the same will be described in detail below with reference to the drawings. In the following description, the same members are generally designated by the same reference numerals, and repeated description will be omitted.

[0032] FIG. 1(A) is a perspective view of the coil device 10 as seen from the front, and FIG. 1(B) is a perspective view of the coil device 10 as seen from the rear.

[0033] 1(A) and 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 as, for example, a line filter, a noise filter, a common mode noise filter, a transformer, etc. The coil device 10 is 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 implemented by plugging or soldering, etc. Furthermore, as described later, the first coil 121 and the second coil 122 are wound with conductors substantially perpendicular to the mounting surface of the coil device 10.

[0034] The core 11 has a generally rectangular frame shape when viewed from the front. Amorphous alloys, silicon steel plates, magnetic bodies such as ferrite, etc. can be used as the material of the core 11. Details of the core 11 will be described later with reference to FIG.

[0035] Coil 12 is made of a wound conductive wire. Specifically, coil 12 is made of a rectangular wire wound edgewise. The surface of the conductive wire constituting coil 12 is coated with a thin resin film (for example, a film made of urethane resin). Here, 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.

[0036] The base 13 is a member made of synthetic resin or the like that is configured so as to be able to fix the core 11, and the configuration thereof will be described later with reference to FIG.

[0037] The terminal portion 19 is a connecting 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 and the like.

[0038] In this embodiment, the first front side terminal portion 191 and the second front side terminal portion 192 and the first rear side terminal portion 193 and the second rear side terminal portion 194 have different lengths. Here, the first rear side terminal portion 193 and the second rear side terminal portion 194 are formed to be longer than the first front side terminal portion 191 and the second front side terminal portion 192. In this way, as described later, 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.

[0039] FIG. 2 is a perspective view showing the core 11 and the coil 12. As shown in FIG.

[0040] The core 11 is a continuous closed magnetic core having, as the winding portion 17, 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 (not shown).

[0041] The coil 12 has a first coil 121 wound around a first winding portion 171, and a second coil 122 wound around a second winding portion 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 or the like, as described above. In addition, the coil portion 127 and the coil portion 128 are substantially perpendicular to the mounting surface of the coil device 10, not shown here.

[0042] The first coil 121 has a coil portion 127 consisting of a conductor wire wound around the first winding portion 171, an upper terminal 125 formed by unwinding the conductor wire at the upper end portion of the coil portion 127, and a lower terminal 126 formed by unwinding the conductor wire at the lower end portion of the coil portion 127.

[0043] Second coil 122 has coil portion 128 made of a conductor wound around second winding portion 172, upper terminal 123 formed by unwinding the conductor wire at the upper end portion of coil portion 128, and lower terminal 124 formed by unwinding the conductor wire at the lower end portion of coil portion 128. Coil portions 127 and 128 have approximately the same outer diameter and outer circumferential length.

[0044] FIG. 3(A) is a perspective view of the base 13 as seen from the front, and FIG. 3(B) is a perspective view of the base 13 as seen from the rear.

[0045] 3A, the base 13 has a pedestal 131 and a rear plate 132. The core 11 shown in FIG.

[0046] The protruding portion 133 is formed by protruding forward so as to be elongated in the up-down direction from the center of the front surface of the back plate 132. The protruding portion 133 is fitted into the central opening of the core 11 described above.

[0047] The recessed portions 134 are formed by partially recessing the front surface of the rear plate 132 into a generally oval shape. Here, the recessed portions 134 are formed in the upper left, upper right, and lower center of the front surface of the rear 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.

[0048] The left support part 138 and the right support part 139 are parts that protrude upward from both 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 above-mentioned core 11 in the left and right directions.

[0049] 3(B), vertically extending portions (vertical portions 195 described below with reference to FIG. 4(A)) of first rear terminal portion 193 and second rear terminal portion 194 are inserted into the inside of rear plate 132 of base 13. In this manner, first rear terminal portion 193 and second rear terminal portion 194 can be firmly supported by base 13, and insulation between first rear terminal portion 193 and second rear terminal portion 194 can be ensured.

[0050] Figure 4(A) is an oblique 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 an oblique 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.

[0051] 4(A), 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 a substantially 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. Therefore, the horizontal portion 196, which is the upper end of the second rear side terminal portion 194, is disposed near the upper end of the second coil 122, and the wire length of the upper terminal 123 can be shortened.

[0052] Upper terminal 123 of second coil 122 is inserted or clamped between horizontal portion 196 and the rear surface of rear plate 132. The connection portion between upper terminal 123 and horizontal portion 196 is welded by solder (not shown). The configuration in which upper terminal 123 is inserted or clamped will be described later with reference to Figs. 6 and 7.

[0053] This allows for a strong connection between upper terminal 123 and horizontal portion 196. Furthermore, since horizontal portion 196 of second rear terminal portion 194 is disposed in the vicinity of the upper end portion of second coil 122, upper terminal 123 can be made approximately as short as lower terminal 124, which will be described later. The connection structure between upper terminal 125 of first coil 121 and first rear terminal portion 193 shown in Fig. 1(B) is similar to the connection structure shown in Fig. 4(A).

[0054] 4(B), second front terminal portion 192 has vertical portion 197 and horizontal portion 198. Lower terminal 124 of second coil 122 is sandwiched or inserted between horizontal portion 198 and the front surface (opposing surface 135) of base 131. Furthermore, the connection portion between horizontal portion 198 and lower terminal 124 is welded by solder (not shown). Such a connection structure is also the same for first front terminal portion 191 and lower terminal 126 of first coil 121 shown in FIG. 1(A).

[0055] 5 is a diagram showing an example of the wire length of upper terminal 123. The length L11 of upper terminal 123 obtained by unwinding the upper end of second coil 122 is preferably equal to or less than half the outer circumferential length L10 of coil portion 128. Here, length L11 of upper terminal 123 is the length from unwinding portion P1 of second coil 122 to portion P2 where upper terminal 123 connects to horizontal portion 196 of second rear terminal portion 194. This length is approximately the same as distance L13 between the end face of second winding portion 172 near the upper end of coil portion 128 and horizontal portion 196.

[0056] The same applies to the other terminals, that is, upper terminal 125, lower terminal 124, and lower terminal 126. In this manner, the length to be unwound can be shortened to make upper terminal 123 etc. substantially straight, and the manufacturing process can be simplified to reduce manufacturing costs.

[0057] More preferably, this effect can be made significant by setting length L11 of upper terminal 123, which is the unwound upper end of second coil 122, to ⅓ or less of outer circumferential length L10 of coil portion 128. The same applies to the other terminals, that is, upper terminal 125, lower terminal 124, and lower terminal 126.

[0058] Figures 6(A), 6(B), 6(C) and 6(D) are diagrams showing various forms of the relative configuration of the opposing 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 the lower terminals shown in Figure 4 are sandwiched between the opposing surface 135 and each horizontal portion.

[0059] 6(A), opposing surface 135 on the front surface of base 13 and horizontal portion 198 are approximately parallel to each other. Distance L12 between opposing surface 135 and horizontal portion 198 is equal to or less than the width (thickness) of lower terminal 124 shown in FIG. 4(B). In this manner, lower terminal 126 can be sandwiched between opposing surface 135 and horizontal portion 198.

[0060] 6(B), here, opposing surface 135 on the front surface of base 13 is inclined with respect to horizontal portion 198. Specifically, opposing 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, lower terminal 126 can be suitably sandwiched between opposing surface 135, which is an inclined surface, and horizontal portion 198.

[0061] 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 extending continuously in the left-right direction. The tip of the protrusion 136 may be disposed in the vicinity of 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.

[0062] 6(D), here, concave portion 137 is formed by recessing facing surface 135 of the portion facing horizontal portion 196 toward the front. In this manner, upper terminal 125 is sandwiched in a curved state between horizontal portion 196 and concave portion 137, so that upper terminal 125 can be more firmly sandwiched.

[0063] 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 lower terminal 124 and second front terminal portion 192, the connection structure between lower terminal 126 and first front terminal portion 191, the connection structure between first rear terminal portion 193 and upper terminal 125, and the connection structure between second rear terminal portion 194 and upper terminal 123 shown in Figure 1(B).

[0064] With reference to FIG. 7, another embodiment of the portion where the horizontal portion 198 and the lower terminal 126 are connected will be described. Here, the distance L12 between the facing surface 135 on the front surface of the base 13 and the rear surface of the horizontal portion 198 is set to be longer than the width (thickness) of the lower terminal 126. In this manner, the lower terminal 126 is inserted between the facing 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 facing surface 135 and the horizontal portion 198 in the manufacturing process.

[0065] Based on FIGS. 1 to 4, and with reference to the above-mentioned drawings, a method for manufacturing the coil device 10 having the configuration shown in FIG. 1 etc. will be described.

[0066] 2, a first coil 121 and a second coil 122 are wound around core 11. Furthermore, upper and lower ends of first coil 121 are formed with upper terminal 125 and lower terminal 126 by unwinding the conductor wire. Upper and lower ends of second coil 122 are formed with upper terminal 123 and lower terminal 124 by unwinding the conductor wire.

[0067] The core 11 is fitted from the front into the base 13 shown in Fig. 3(A). At this time, the protruding portion 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 a left support portion 138 and a right support portion 139. The terminal portions 19 for connecting each end of the coil 12 are pre-assembled to the base 13, and a predetermined distance is provided between each horizontal portion (196, 198) of each terminal and the opposing surface 135 of the base.

[0068] 4(B), the lower terminal 124 is sandwiched or inserted between the horizontal part 198 of the second front terminal part 192 and the front surface of the base 131, and the horizontal part 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 part 198. Furthermore, by a similar process, the horizontal part 198 of the first front terminal part 191 shown in FIG. 1(A) is electrically connected to the lower terminal 126.

[0069] 1(B), similarly to 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.

[0070] Through the above steps, the coil device 10 shown in FIG. 1 is manufactured.

[0071] The above-described embodiment can provide the following main effects.

[0072] 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 the upper terminal 123 of the second coil 122 and the horizontal portion 196 are connected, there is no need to perform post-processing such as terminal bending on the horizontal portion 196, and by eliminating these operations, the production cost can be reduced.

[0073] Referring further to FIG. 5, since the length of upper terminal 123 of coil 12 is less than half the outer circumferential length of coil portion 128, upper terminal 123 can be shortened, and the forming work for unwinding upper terminal 123 of coil 12 can be simplified or eliminated.

[0074] Referring to FIG. 3(B), further, first rear side terminal portion 193 and second rear side terminal portion 194 are inserted through the inside of back plate 132 of base 13, so that first rear side terminal portion 193 and second rear side terminal portion 194, which are formed relatively long, can be protected by back plate 132 and have improved insulation.

[0075] Furthermore, referring to FIG. 1(A), the ends of the first coil 121 and the second coil 122, which are formed by edgewise winding a rectangular wire, can be easily connected to the first front terminal portion 191 to the second rear terminal portion 194, thereby improving the connection reliability.

[0076] 4(A), further, by sandwiching upper terminal 123 of second coil 122 between horizontal portion 196 of second rear terminal portion 194 and base 13, upper terminal 123 can be firmly connected to terminal portion 19. Furthermore, in the manufacturing process of coil device 10, upper terminal 123 is temporarily fixed by sandwiching or inserting it between horizontal portion 196 and base 13, and solder connection can be performed in this state.

[0077] 4(A), horizontal portion 196 of second rear terminal portion 194 faces rear plate 132 of base 13, thereby improving the insulation of horizontal portion 196. Furthermore, when soldering upper terminal 123 to horizontal portion 196, horizontal portion 196 and upper terminal 123 can be pressed against rear plate 132 with a soldering iron, making it possible to perform soldering reliably and easily.

[0078] Referring to FIG. 1A, by further including a closed magnetic core, a first coil 121 and a second coil 122, it can be used as a line filter.

[0079] Referring to FIG. 1(B), furthermore, in the manufacturing method, the long first rear side terminal portion 193 and the second rear side terminal portion 194 are extended to near the upper end of the coil 12, thereby making it possible to eliminate the need for a forming operation for unraveling the ends of the coil 12 for connection, and to simplify the connection structure and connection operation of the coil 12.

[0080] Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and modifications can be made without departing from the scope of the present invention. In addition, the above-described embodiments can be combined with each other.

[0081] 3(B), in the above embodiment, first rear terminal portion 193 and second rear terminal portion 194 are inserted inside rear plate 132 of base 13, but first rear terminal portion 193 and second rear terminal portion 194 can also be incorporated into 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 rear plate 132, and first rear terminal portion 193 and second rear terminal portion 194 can be fitted into this groove-shaped region.

[0082] 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. Also, it is also possible to provide only one coil and use it as an inductor. [Explanation of symbols]

[0083] 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 portion, 135...opposing surface, 136...projecting portion, 137...concave portion, 138...left support portion, 139...right support portion, 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, 106...upper end

Claims

1. 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:

2. 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:

3. 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.

4. The coil device according to claim 3 , wherein the rear terminal portion is inserted through the inside of the back plate of the base.

5. 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. 6. The coil device according to claim 3, wherein the horizontal portion of the terminal portion faces a rear plate of the base.

7. 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.

8. a coil device including 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, 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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