JP7347129B2 - coil device - Google Patents

Description

The present invention relates to a coil device suitably used as, for example, a transformer.

Patent Document 1 discloses a coil device including a terminal block from which a pair of lead portions of a wire are drawn out. However, in conventional coil devices, it is difficult to arrange a plurality of terminals in close proximity in an insulated state, and there is a problem that it is difficult to save space in order to ensure insulation.

JP2015-65431A

The present invention has been made in view of the above circumstances, and an object thereof is to provide a coil device that has excellent insulation between terminals and is easy to save space.

In order to achieve the above object, the coil device according to the present invention includes:
a bobbin around which the wire is wound;
a conductive terminal to which the lead portion of the wire is connected;
A coil device comprising an insulating terminal block to which the terminal is attached,
The terminal is
a fixing part fixed to the terminal block;
an external connection part formed integrally with the fixing part at a tip position protruding from the terminal block along the first axis;
A terminal block protrudes from the terminal block and is formed integrally with the external connection part at a position between the fixed part and the external connection part along the first axis, and the lead part is inserted and connected. a wire connection;
has.

In the coil device of the present invention, the terminal fixing part and the external connection part are arranged along the first axis, and the wire connection part is formed between them. Therefore, even if a plurality of terminals are arranged on the terminal block, the insulation between the terminals is excellent, and space can be saved. It also contributes to miniaturization of the coil device.

Preferably, the fixing part and the external connection part are integrally connected by a connection part exposed from the terminal block, and the wire connection part is integrally formed in the connection part. . With this configuration, even if a plurality of terminals are arranged on the terminal block, the insulation between the terminals is excellent, and space can be saved. It also contributes to miniaturization of the coil device.

Also preferably, the fixing part and the connecting part are continuously formed as part of a base plate,
The wire connecting portion is formed by folding back from a side edge of the connecting portion so that the lead portion can be sandwiched therebetween.

More preferably, the external connecting portion includes an insertion piece formed by bending at a predetermined angle from the connecting portion.

With this configuration, the terminal can be easily formed from a conductive plate material such as a metal plate by press working or the like. Furthermore, even if a plurality of terminals are arranged on the terminal block, the insulation between the terminals is excellent and space can be saved. It also contributes to miniaturization of the coil device.

Preferably, the plug-in piece has a plug-in edge that can be plugged into the external substrate along a third axis parallel to the winding axis of the wire. With this configuration, connection of the terminal to the external board becomes extremely easy.

The coil device of the present invention may further include a cover member in which an abutment portion capable of contacting an opposite edge of the insertion piece opposite to the insertion edge is formed. With this configuration, the cover member takes charge of the reaction force when inserting the insertion piece into the receiving terminal of the external circuit, making it easier to connect the terminal to the external board. Also, no excessive force is applied to the terminals.

A notch may be formed at the bending intersection between the tip of the connecting portion and the insertion piece. With this configuration, distortion and deformation of the insertion piece can be effectively prevented, and the insertion piece can be easily inserted into the receiving terminal of the external board.

The external connection portion and the wire connection portion may be displaced from each other along a second axis intersecting the first axis. With this configuration, the lead portion of the wire can be easily connected to the wire connection portion by soldering, fusing, or the like.

The terminal block may be configured separately from the bobbin, and may be attached to a terminal block connection portion of the bobbin. With this configuration, if the terminal block specifications change, you can simply replace the terminal block attached to the bobbin with a terminal block that meets the specifications, eliminating the need to rebuild the entire bobbin from scratch. There is no. Therefore, it is possible to flexibly respond to changes in the specifications of the terminal block, and it is possible to provide a coil device with a high degree of freedom in design.

Moreover, it becomes possible to mold the bobbin and the terminal block separately, and it is possible to mold them using materials suitable for each. For example, by molding the bobbin from a material with high thermal conductivity, a coil device with excellent thermal conductivity can be obtained. Further, by including a filler in the material constituting the bobbin, it is possible to obtain a bobbin with excellent strength, and the strength of the coil device can be increased. Further, by molding the terminal block using a material with excellent moldability, it is possible to improve the dimensional accuracy even for a terminal block having a complicated shape, which can contribute to miniaturization of the coil device.

Further, when molding the bobbin, it is not necessary to use a mold that takes the specifications of the terminal block into consideration, and it is possible to use a mold that conforms to the specifications of the bobbin. Therefore, compared to the case where a bobbin with an integrated terminal block is molded, the structure of the mold can be simplified and manufacturing becomes easier.

Furthermore, the terminal block may be attached to the terminal block connecting portion of the bobbin in a direction substantially perpendicular to the winding axis of the bobbin. In that case, it becomes easy to position the height position of the terminal provided on the terminal block with high precision with respect to the bobbin, and it becomes easy to position the terminal to the external terminal connected to the terminal of the coil device. .

Preferably, a bobbin groove for passing the lead portion is formed in the terminal block connection portion,
The lead part is pulled out through the bobbin groove located between the terminal block and the terminal block connection part.

With this configuration, the insulation between the plurality of lead parts can be improved.

Preferably, the terminal block is formed with a guide groove that guides the lead portion that has passed through the bobbin groove to the wire connection portion. With this configuration, the lead portion can be easily guided to the wire connection portion, and the connection of the lead portion can be facilitated.

The terminal block connecting portion may include an engagement piece that engages with an engagement groove formed in the terminal block. By fitting the engagement piece into the engagement groove, it becomes easy to join the terminal block and the bobbin, and it also becomes easy to position the terminal block on the bobbin. Further, the terminal block can be firmly connected to the terminal block connecting portion.

A support may be attached to the terminal block or the terminal block connection part to hold and insulate the connecting part of the terminal from below. With this configuration, the terminals that protrude long from the terminal block can be stably supported.

Preferably, the fixing portion of the terminal is fixed to the terminal block by insert molding. With this configuration, even when a plurality of terminals are arranged on the terminal block, the insulation between the terminals is excellent, and it is easy to save space.

FIG. 1 is a perspective view of a coil device according to an embodiment of the present invention. 2A is an exploded perspective view of the coil device shown in FIG. 1. FIG. FIG. 2B is an enlarged perspective view of the terminal fitting shown in FIG. 2A. FIG. 3 is a perspective view of the bobbin with terminal block shown in FIG. 2A. FIG. 4A is an exploded perspective view of the bobbin, terminal block, and support body shown in FIG. 2A. FIG. 4B is an exploded perspective view of the bobbin and insulation adapter shown in FIG. 4A. FIG. 4C is a perspective view of the bobbin shown in FIG. 4B from another angle. FIG. 5 is an enlarged perspective view of the terminal block with terminal fittings shown in FIG. 2A. FIG. 6 is a perspective view of only the terminal block shown in FIG. 5 viewed from another angle. FIG. 7 is a perspective view of a first coil section and a second coil section included in the coil device shown in FIG. 1.

The present invention will be described below based on embodiments shown in the drawings.

A transformer 10 as an example of a coil device according to the present embodiment shown in FIG. 1 is used for, for example, an EV (Electric Vehicle), a PHV (Plug-in Hybrid Vehicle), or a commuter (vehicle). It is used in car chargers, power supply circuits for household or industrial electrical equipment, and power supply circuits for computer equipment. As shown in FIG. 2A, the transformer 10 includes a bobbin 20, magnetic cores (divided cores) 40a and 40b, and a terminal block 80.

Note that in the drawings, the X-axis, Y-axis, and Z-axis are perpendicular to each other, and in this embodiment, the X-axis corresponds to the longitudinal direction of the bobbin 20, and the Y-axis corresponds to the pair of split cores 42a, 42a or The pair of divided cores 42b, 42b substantially coincide with the direction of the dividing line. The direction of the dividing line may be along the X axis. The Z-axis corresponds to the height (thickness) direction of the transformer 10. In this embodiment, the lower part of the transformer 10 in the Z-axis direction is the installation surface of the transformer.

As shown in FIG. 2A, the bobbin 20 includes a bobbin body 24 and a terminal block connection portion 22 formed at the upper part of one end of the bobbin body 24 in the X-axis direction. Although the bobbin 20 is made of plastic such as PPS, PET, PBT, or LCP, it may be made of other insulating materials. Preferably, the bobbin 20 is made of a heat resistant material. In order to improve strength and thermal conductivity, these insulating members may be filled with filler such as glass.

As shown in FIG. 2A, in this embodiment, the magnetic cores 40a, 40b can be separated into two split cores 42a, 42a and 42b, 42b, each having the same shape. In this embodiment, the divided cores 42a, 42a and 42b, 42b all have the same shape and have an E-shaped cross section in the ZY cross section, forming a so-called E-shaped core. The other pair of split cores 42b, 42b disposed at the lower part in the Z-axis direction also have an E-shaped cross section in the ZY cross section, and constitute a so-called E-shaped core.

Each split core 42a disposed on the upper side in the Z-axis direction includes a base portion 44a extending in the Y-axis direction, a pair of middle leg portions 46a protruding in the Z-axis direction from both ends of the base portion 44a in the Y-axis direction, and side legs. It has a leg portion 48a. Each split core 42b disposed on the lower side in the Z-axis direction includes a base portion 44b extending in the Y-axis direction, a pair of middle leg portions 46b protruding in the Z-axis direction from both ends of the base portion 44b in the Y-axis direction, and It has a side leg portion 48b.

The outer surfaces of the base portions 44a and 44b are connected to a terminal block protrusion formed on the inner surface (center side in the X-axis direction of the bobbin 20) of the terminal block 80 connected to the upper end of the bobbin body 24, and The magnetic cores 40a and 40b are in contact with the inner surface of the protruding piece 29 formed on the upper part of the other end, thereby making it possible to prevent the magnetic cores 40a and 40b from shifting in the X-axis direction or the Y-axis direction. ing.

The pair of middle leg portions 46a are inserted into the core leg through hole 26 of the bobbin 20 from above in the Z-axis direction. Similarly, the pair of middle legs 46b are inserted into the core leg through hole 26 of the bobbin 20 from below in the Z-axis direction, and inside the through hole 26, their tips are aligned with the tips of the middle legs 46a. It is configured such that it contacts or faces with a predetermined gap.

Separation convex portions 27 (see FIG. 2) are formed along the Z-axis direction on the inner peripheral surface of the winding tube portion 28 constituting the through-hole 26 at opposing positions in the X-axis direction. The separation convex portion 27 is interposed between the middle legs 42a, 42a and between the middle legs 42b, 42b, and the separation protrusion 27 is interposed between the middle legs 42a, 42a or between the middle legs 42b, 42b. However, inside the through hole 26, they are configured to face each other with a predetermined gap and not to come into contact with each other. The predetermined gap can be adjusted by adjusting the thickness of the separation protrusion 27 in the Y-axis direction.

The middle legs 42a, 42a or the middle legs 42b, 42b have an elliptical cylindrical shape that is long in the X-axis direction so as to match the shape of the inner peripheral surface of the through hole 26 when combined. The shape is not particularly limited, and may be changed according to the shape of the through hole 26. Further, the side legs 48a, 48b have an inner concave curved surface shape matching the outer peripheral surface shape of the cover main body 52 of the cover 50, and the outer surface thereof has a plane parallel to the XZ plane. In this embodiment, the material of each divided core 42a, 42b may be a soft magnetic material such as metal or ferrite, but is not particularly limited.

The cover body 52 of the cover 50 has a shape that covers the outer periphery of the bobbin body 24. At both ends of the cover body 52 in the Z-axis direction, locking pieces 54 are integrally formed and are bent in a substantially vertical direction from the cover body 52 toward the bobbin body 24 .

A pair of locking pieces 54 formed on both sides of the cover body 52 in the Z-axis direction have locking protrusions 540. A hole 540a is formed approximately at the center of the locking projection piece 540.

The locking protrusion piece 540 is fixed to the wide stepped portion 250 of the stepped portion 25 shown in FIG. 4A. More specifically, when the locking protrusion piece 540 is fixed to the wide step portion 250, the protrusion 250a formed on the wide step portion 250 fits into the hole 540a of the locking protrusion piece 540. As a result, the pair of locking pieces 54 are attached so as to sandwich the upper and lower surfaces of the bobbin body 24 in the Z-axis direction, and are disposed on the stepped portion 25 formed on the upper surface of the bobbin body 24.

As shown in FIG. 2, side leg guide pieces 56 extending in the Z-axis direction are integrally formed on the outer surface of both ends of the cover body 52 in the X-axis direction. In the example shown in FIG. 1, the side leg guide pieces 56 are in contact with the outer surfaces of the base parts 44a and 44b on the outside in the X-axis direction, but also in contact with the outer surfaces of the side legs 48a and 48b on the outside in the X-axis direction. You can leave it there. The inner surfaces of the side legs 48a, 48b contact the outer surface of the cover body 52 located between the pair of side leg guide pieces 56, and the movement of the side legs 48a, 48b in the X-axis direction It is restricted by a guide piece 56.

One side leg guide piece 56 near the terminal block 80 along the X-axis direction is formed larger than the other side leg guide piece 56, and as shown in FIG. 1, the cover 50 is attached to the bobbin 20. Sometimes, it is arranged near one first lead part 37a of the first wire 37 shown in FIG. Therefore, one side leg guide piece 56 near the terminal block 80 secures the insulation distance (space distance and creepage distance) between the first lead portion 37a of the first wire 37 and the cores 40a, 40b, and , serves to guide the first lead portion 37a upward in the Z-axis. Note that the cover 50 is made of an insulating member such as plastic similar to the bobbin 20.

A first wire 37 forming a first coil portion 35 shown in FIG. 7 and a second wire 38 forming a second coil portion 36 shown in FIG. 7 are wound around the bobbin body 24 .

As shown in FIGS. 3, 4A, and 4B, end partition flanges 31 and 32 extend outward in the radial direction at both ends of the winding cylinder portion 28 of the bobbin 20 in the Z-axis direction. It is integrally molded approximately parallel to the Y plane. A first coil part 35 and a second coil part 36 shown in FIG. direction) at different positions. In the first coil part 35, a first wire 37 constituting either the primary coil or the secondary coil is wound, and in the second coil part 36, a first wire 37 constituting either the primary coil or the secondary coil is wound. A second wire 38 constituting the other wire is wound.

In this embodiment, an insulating partition flange 30 approximately parallel to the XY plane is provided on the outer periphery of the winding tube portion 28 (see FIG. 3) located between the first coil portion 35 and the second coil portion 36. It has been formed. The first coil portion 35 shown in FIG. 7 includes a winding partition flange 33 (see FIG. 3) is formed.

In addition, in the present embodiment, the second coil part 36 shown in FIG. A winding partition collar 34 (see FIG. 3) is formed to separate the sections into sections. As shown in FIG. 4C, each of the winding partition flanges 33 and 34 is formed with at least one communication groove 33a, 34a that communicates the adjacent sections S1, S2 or S1a, S2a.

As shown in FIG. 4C, the communication grooves 33a, 34a are formed on the opposite side along the X-axis of the winding partition flanges 33, 34 from the side where the terminal block connection part 22 in the X-axis direction is arranged. There is. These communication grooves 33a and 34a are formed to a depth that reaches the outer circumferential wall of the winding tube portion 28 in a portion of the circumferential direction of each of the partition walls 33 and 34, respectively.

As shown in FIG. 4C, the first wire 37 shown in FIG. 7 is wound around the sections S1 and S2 partitioned in the Z-axis direction by the partition walls 30, 33, and 31, and for each section S1 and S2, The wire windings can be separated from each other. In this embodiment, the width of each of the sections S1 and S2 along the Z axis is set to a width that allows only one wire 37 to fit therein. However, in this embodiment, the partition width may be set to a width that allows two or more wires 37 to enter. Further, in this embodiment, it is preferable that all the partition widths are the same, but they may be slightly different.

Similarly to the first coil part 35, in the second coil part 36 shown in FIG. The second wire 38 shown is wound, and the wire winding portions can be separated from each other in each section S1a, S2a. In this embodiment, the width of each of the sections S1a and S2a along the Z axis is set to a width that allows only one wire 38 to fit therein. Note that the section width may be made the same as the section width in accordance with the wire diameter of the wire 38.

Further, the radial width of the partition walls 30 to 34 shown in FIG. The width in the radial direction is set so that the wire of the layer can be wound. The radial widths of the partition walls 30 to 34 are preferably all the same, but may be different.

As shown in FIG. 4A, a terminal block 80 configured separately from the bobbin 20 is attached to the terminal block connecting portion 22. The first lead parts 37a, 37b of the first wire 37 and the second lead parts 38a, 38b of the second wire 38 shown in FIG. 7 are pulled out and fixed to the terminal block 80. The width in the Y-axis direction and the width in the X-axis direction of the terminal block connecting portion 22 are determined according to the width in the Y-axis direction and the width in the X-axis direction of the bottom surface of the terminal block 80.

As shown in FIG. 4A, a terminal block connection part 22 is provided on the front side of the bobbin 20 in the X-axis direction, and a terminal block connection part 22 is provided on the bobbin body 24 on the opposite side in the X-axis direction from the terminal block connection part 22. A piece 29 is formed. The protruding piece 29 has a surface substantially parallel to the YZ plane, and protrudes from the upper surface of the bobbin body 24 toward the upper side of the Z axis. The protruding piece restricts movement of the magnetic core 40a shown in FIG. 1 in the X-axis direction.

The terminal block connection part 22 integrally molded on the bobbin 20 includes a base part 22a extending in the Y-axis direction, and an insulating wall raised substantially perpendicularly to the base part 22a upward in the Z-axis direction. 22b. The insulating wall 22b is formed parallel to the ZY plane and ensures insulation between the terminals (for example, terminal fittings) 60a to 60d and the magnetic core 40a shown in FIG. 2A. Further, as shown in FIG. 4A, the base portion 22a is formed parallel to the XY plane, and is used to attach the terminal block 80.

The base portion 22a is provided along the Y axis as shown in FIG. 4A in order to guide the lead portions 37a, 37b, 38a, 38b of the wires 37, 38 shown in FIG. 7 to the terminals 60a to 60d of the terminal block 80. Four bobbin side notches (bobbin grooves) 23a to 23d are intermittently formed recessed in the X-axis direction. Further, engagement pieces 22c are formed at both ends of the base portion 22a along the Y-axis, respectively, and the thickness in the Z-axis direction is thinner than that at the center. Each engagement piece 22c can be inserted and fitted into engagement grooves 84b and 86b formed below both ends in the Y-axis direction on the back side of the terminal block 80 shown in FIG.

As shown in FIG. 5, the terminal block 80 has a rod member 82 extending in the Y-axis direction, and end books 84 and 86 are integrated at both ends of the rod member 82 in the Y-axis direction, respectively. As shown in FIG. 6, engagement hooks 84a, 86a are formed at the lower portions of the end blocks 84, 86 in the Z-axis direction, together with engagement grooves 84b, 86b.

As shown in FIG. 6, guide notches 82a to 82d are formed on the back surface of the rod member 82 in the X-axis direction so as to be intermittently recessed in the X-axis direction along the Y-axis direction. These guide notches 82a to 82d are formed to face the bobbin side notches (bobbin grooves) 23a to 23d shown in FIG. 4A, corresponding to the positions in the Y-axis direction. These guide notches 82a to 82d also communicate with upper surface side notches formed on the upper surface of the terminal block 80 in the Z-axis direction.

Note that, as shown in FIG. 4B, only the bobbin groove 23b has a slit groove 23b1 formed along the concave edge of the bobbin groove 23b and parallel to a plane including the X-axis and the Y-axis. A flat upper surface portion 72 of the insulating adapter 70 is inserted into the slit groove 23b1, so that the insulating adapter 70 can be attached to the terminal block connecting portion 22. The insulating adapter 70 is attached to the terminal block connecting portion 22 of the bobbin 20 after the second wire 38 shown in FIG. 7 is attached to the bobbin 20 shown in FIG. 4B.

The guide notch 82b of the terminal block 80 shown in FIG. 4A is connected to the guide groove 76 of the insulating adapter 70 shown in FIG. The first lead portion 37b is passed through this portion.

As shown in FIG. 4B, the insulating adapter 70 includes a curved plate-shaped side surface 71, a plate-shaped upper surface 72 formed at the upper part of the side surface 71 in the Z-axis direction, and a plate-shaped upper surface 72 formed on the top of the side surface 71 in the Z-axis direction. It has a plate-shaped bottom part 73 formed at the lower part in the Z-axis direction. A guide groove 76 extending in the Z-axis direction is formed in a part of the curved outer surface of the side surface portion 71. The other lead portion 37b of the first wire 37 shown in FIG. 7 is passed through the guide groove 76 in the Z-axis direction.

The insulating adapter 70 shown in FIG. 4B is attached to the bobbin 20 before the terminal block 80 shown in FIG. 4A is connected to the terminal block connection part 22. Before the insulating adapter 70 shown in FIG. 4B is attached to the terminal block connection part 22, the lead parts 37a, 38b, and 38a shown in FIG. 4A are passed through the bobbin side notches 23a, 23c, and 23d, respectively. Only the lead portion 37b is not passed through the bobbin side notch 23b. Only the lead portion 37b is passed through the guide groove 76 of the insulating adapter 70 after the insulating adapter 70 shown in FIG. 4B is attached to the terminal block connecting portion 22.

After that, by attaching the terminal block 80 to the terminal block connection part 22, the lead parts 37a, 38b, 38a shown in FIG. sandwiched between each. Further, the lead portion 37b is sandwiched between the guide groove 76 of the insulating adapter 70 attached to the notch 23b and the notch 82b of the terminal block 80.

As shown in FIG. 5, terminal mounting portions 83a to 83d are formed intermittently along the Y axis direction near the Z axis direction of adjacent notches 82a to 82d formed in the rod member 82, respectively. It has been done. Terminals 60a to 60d are attached to these terminal attachment parts 83a to 83d. The terminal 60a and the terminal 60b each have the same shape, and the terminal 60c and the terminal 60d each have the same shape.

As shown in FIG. 2B, the terminal 60a and the terminal 60b each have a flat base plate 62α. A fixing part 64α is formed as a part of the base plate 62α at one end of the base plate 62α in the X-axis direction, and a connecting part 66α is formed as a part of the base plate 62α at the other end of the base plate 62α. be. On one side edge of the connecting portion 66α close to the fixed portion 64α, a lead connecting portion 68α as a wire connecting portion is formed by bending back and protruding in the Y-axis direction and is integrally bent with the connecting portion 66α. be.

Further, on the other side edge of the connecting portion 66α far from the fixed portion 64α, a lead connecting portion 68α is bent at a predetermined angle from the plane of the connecting portion 66α and is integrally formed with the lead connecting portion 68α. An external connection 69 is formed as a plug-in piece. The external connection portion 69 as an insertion piece also has a flat plate shape like the base plate 62α, and in this embodiment, is formed by being bent at substantially right angles to each other. The flat external connection portion 69 extends further in the X-axis direction than the end of the base plate 62α in the X-axis direction, and a lower end edge of the external connection portion 69 in the Z-axis direction is not shown. It has an insertion edge 69a that can be inserted into a receiving terminal of an external circuit board.

On the opposite side in the Z-axis direction from the insertion edge 69a of the flat external connection portion 69, an anti-insertion edge 69b is preferably formed substantially parallel to the insertion edge 63a. The anti-insertion edge 69b can come into contact with a protruding (or concave) abutting part 102 formed on the back surface of the terminal cover 100 as an insulating cover member shown in FIG.

As shown in FIG. 2B, a notch 67 is formed at the bending intersection between the tip of the connecting portion 66α in the X-axis direction and the anti-insertion edge 69b of the external connection portion 69, which is an insertion piece. be. Providing the notch 67 makes it easier to bend the external connection part 69 as an insert piece to the base plate 62α, and also makes it easier to maintain these angles at a predetermined angle, and also prevents the insert piece from bending. This makes it easier to insert into the receiving side metal fitting of the circuit board (not shown).

As shown in FIG. 3, each lead portion 37a, 37b is caulked and connected to the lead connection portion 68α shown in FIG. 2B by thermocompression bonding or the like. Alternatively, they may be connected by other connection means other than caulking. Examples of other connection means include soldering, welding, resistance welding, ultrasonic welding, laser welding, caulking, thermocompression bonding, and thermal fusion bonding.

As shown in FIG. 2B, the terminal 60c and the terminal 60d each have a flat base plate 62β. A fixing part 64β is formed as a part of the base plate 62β at one end of the base plate 62β in the X-axis direction, and a connecting part 66β is formed as a part of the base plate 62β at the other end of the base plate 62β. be. On one side edge of the connecting portion 66β near the fixed portion 64β, a lead connecting portion 68β as a wire connecting portion is formed by bending back and protruding in the Y-axis direction and is integrally bent with the connecting portion 66β. be.

Further, on the same side edge of the connecting portion 66β that is far from the fixed portion 64β, there is a gap formed integrally with the lead connecting portion 68β by being bent at a predetermined angle from the plane of the connecting portion 66β and displaced from the lead connecting portion 68β in the X-axis direction. An external connection portion 69 is formed as an insert piece. The external connection portion 69 as an insertion piece also has a flat plate shape like the base plate 62β, and in this embodiment, is formed by being bent at a substantially right angle to each other. The flat external connection portion 69 extends further in the X-axis direction than the end of the base plate 62β in the X-axis direction, and a lower end edge of the external connection portion 69 in the Z-axis direction is not shown. It has an insertion edge 69a that can be inserted into a receiving terminal of an external circuit board.

On the opposite side in the Z-axis direction from the insertion edge 69a of the flat external connection portion 69, an anti-insertion edge 69b is preferably formed substantially parallel to the insertion edge 63a. The anti-insertion edge 69b can come into contact with a protruding (or concave) abutting part 102 formed on the back surface of the terminal cover 100 as an insulating cover member shown in FIG.

As shown in FIG. 2B, a notch 67 is formed at the bending intersection between the tip of the connecting portion 66β in the X-axis direction and the anti-insertion edge 69b of the external connection portion 69, which is an insertion piece. be. By providing the notch 67, it becomes easy to bend the external connection part 69 as an insertion piece to the base plate 62β, and it also becomes easier to maintain these angles at a predetermined angle, and also prevents the insertion piece from bending. This makes it easier to insert into the receiving side metal fitting of the circuit board (not shown).

As shown in FIG. 3, each lead portion 38b, 38a is connected to the lead connection portion 68β shown in FIG. 2B by the same connection means as the lead connection portion 68α. In this embodiment, the external connection portions 69 of the terminals 60a and 60b and the external connection portions 69 of the terminals 60c and 60d have the same size and shape, but may be different from each other.

Further, in this embodiment, the lead connecting portions 68α of the terminals 60a and 60b and the lead connecting portions 68β of the terminals 60c and 60d have slightly different shapes. This is because the lead portions 37a, 37b, 38a, and 38b connected to these lead connection portions 68α and 68β have different thicknesses.

Furthermore, in this embodiment, the base plates 62α of the terminals 60a and 60b and the base plates 62β of the terminals 60c and 60d have somewhat different shapes. Further, the direction in which the external connection piece 69 of the terminals 60a, 60b is bent relative to the base plate 62α is opposite to the direction in which the external connection portion 69 of the terminal 60c, 60d is bent relative to the base plate 62β. The reason for this is that, as shown in FIG. 3, for example, the intervals in the Y-axis direction of the external connection portions 69 of each of the terminals 60a to 60d are approximately equal, and the lead portions 37a and 37a connected to each of the terminals 60a to 60d, This is to facilitate ensuring insulation between 37b, 38a, and 38b.

As shown in FIGS. 4A and 7, in this embodiment, one of the pair of first lead parts 37a and 37b of the first wire 37 is connected to the Y-axis of one side of the terminal block 80. It is pulled out toward the vicinity of the first end in the direction and raised toward the first end side terminal 60a.

The first lead portion 37a extends from the section S1 shown in FIG. It is pulled out to the vicinity of the first end. One end of the first lead portion 37a is connected to the first end side terminal 60a.

Further, of the pair of first lead parts 37a and 37b, the other first lead part 37b is a first inner terminal located between the first end terminal 60a and the second end terminal 60d of the terminal block 80. It is being launched towards 60b. The first lead portion 37b is raised from the section S2 shown in FIG. 3 in a direction parallel to the winding axis closer to the center of the terminal block 80 in the Y-axis direction than the first lead portion 37a. One end of the first lead portion 37b is connected to the first inner terminal 60b.

Further, among the pair of second lead parts 38a and 38b of the second wire 38, one second lead part 38a is pulled out toward the vicinity of the second end in the Y-axis direction on the other side of the terminal block 80, and It is connected by rising toward the second end side terminal 60d near the second end. The second lead portion 38a is raised from the section S1a shown in FIG.

Further, of the pair of second lead parts 38a and 38b, the other second lead part 38b is connected to a second inner terminal 60c located between the first inner terminal 60b and the second end terminal 60d of the terminal block 80. It is being launched towards. The second lead portion 38b is pulled out from the section S2a shown in FIG. 3 (the position closest to the terminal block 80 along the Z-axis on the outer periphery of the wound tube portion 28), and connected to the second inner terminal 60c. ing.

In this embodiment, the second wire 38 shown in FIG. 7 is connected to the wound cylinder part 28 shown in FIG. It is α-wound. Further, the first wire 37 shown in FIG. 7 is α-wound around the winding tube portion 28 by using the communication groove 33a formed on the other side of the X axis of the winding partition flange 33 shown in FIG. 4C. Note that the method of winding the first wire 37 and the second wire 38 is not limited to alpha winding, but may be normal winding.

In manufacturing the transformer 10, first, a bobbin 20, a first wire 37, a second wire 38, a cover 50, magnetic cores (split cores) 40a, 40b, and terminals configured separately from the bobbin 20 are manufactured. A stand 80 is prepared. In the terminal block 80, a first end terminal 60a, a first inner terminal 60b, a second end terminal 60c, and a second inner terminal 60d are insert-molded (or bonded).

In this embodiment, the fixing parts 64α and 64β of the terminals 60a to 60d shown in FIG. It is embedded and fixed inside the resin that constitutes it by insert molding. The portions of each of the terminals 60a to 60d other than the fixing portions 64α and 64β are exposed from the outer surface of the terminal block 80 in the X-axis direction and protrude in the X-axis direction.

Next, the first coil part 35 and the second coil part 36 shown in FIG. 7 are formed on the outer periphery of the bobbin 20 shown in FIG. 4B. Note that the first coil portion 35 and the second coil portion 36 shown in FIG. 7 may be formed using an automatic winding machine. Further, the wires 37 and 38 may be made of a single wire or a twisted wire, and preferably made of an insulated conductive wire. The second wire 38 may be the same as the first wire 37, or may be different. In this embodiment, the outer diameter of the first wire 37 is preferably larger than the outer diameter of the second wire 38, for example, φ1.0 to φ3.0 mm.

As shown in FIG. 4A, one of the first lead parts 37a is passed through the bobbin side notch 23a, and the second lead parts 38a and 38b are passed through the bobbin side notches 23d and 23c, respectively. The other lead part 37b does not pass directly through the bobbin side notch 23b, but after attaching the insulating adapter 70 shown in FIG. 4B to the notch 23b, it is inserted into the guide groove 76 along the Z axis of the adapter 70. Passed.

Next, the engagement piece 22c shown in FIG. 4A is inserted from the X-axis direction into the engagement grooves 84b, 86b formed by the engagement hooks 84a, 86a of the terminal block 80 shown in FIG. Attach to the terminal block connection part 22. An adhesive may be used if necessary.

Next, as shown in FIG. 3, each of the lead portions 37a to 37d is connected to the lead connection portions 68α and 68β of the terminals 60a to 60d, respectively. Thereafter, a pair of covers 50 shown in FIG. 2A are attached to the bobbin 20. Thereafter, the middle legs 46a of the pair of split cores 42a, 42a separated in the X-axis direction and the middle legs 46b of the pair of split cores 42b, 42b separated in the X-axis direction are inserted into the core leg through holes. 26 from both sides in the X-axis direction.

Next, if necessary, the upper part of the terminal block 80 attached to the bobbin 20 in the Z-axis direction is covered with a terminal cover (cover member) 100 shown in FIG. Further, if necessary, the lower part of the transformer 10 (below the terminals 60a to 60d) is housed in a casing (not shown) with an open top end, and potting resin is injected into the casing. The potting resin is composed of silicone resin, urethane resin, epoxy resin, etc., which are soft even after injection, and the longitudinal elastic modulus of the potting resin is preferably 0.1 to 100 MPa.

The heat dissipation sheet 110 shown in FIG. 1 has a function of transmitting heat transferred from the inside of the transformer 10 to the upper part of the magnetic core 40a to, for example, a potting resin, and is made of aluminum, copper, or the like having excellent heat conductivity. Although the heat dissipation sheet 110 does not necessarily need to be provided, it is preferable to provide it from the viewpoint of improving heat dissipation.

In the transformer 10 according to the present embodiment, the terminal block 80 is configured separately from the bobbin 20 and is attached to the bobbin 20. Therefore, when the specifications of the terminal block 80 are changed, it is only necessary to replace the terminal block 80 attached to the bobbin 20 with a terminal block that conforms to the specifications, and there is no need to rebuild the entire bobbin 20 from scratch. . Therefore, it is possible to flexibly respond to changes in the specifications of the terminal block 80, and it is possible to provide the transformer 10 with a high degree of freedom in design.

Moreover, it becomes possible to mold the bobbin 20 and the terminal block 80 separately, and it is possible to mold them using materials suitable for each. For example, by molding the bobbin 20 from a material with high thermal conductivity, the transformer 10 with excellent thermal conductivity can be obtained. Further, by including a filler in the material constituting the bobbin 20, it becomes possible to obtain the bobbin 20 with excellent strength, and the strength of the transformer 10 can be increased. Furthermore, by molding the terminal block 80 using a material with excellent moldability, it is possible to improve the dimensional accuracy even for the terminal block 80 having a complicated shape, which contributes to the miniaturization of the transformer 10. can.

Further, when molding the bobbin 20, it is not necessary to use a mold that takes the specifications of the terminal block 80 into consideration, and it is possible to use a mold that conforms to the specifications of the bobbin 20. Therefore, compared to the case of molding a bobbin in which the terminal block 80 is integrated, the structure of the mold can be simplified and manufacturing becomes easier.

Moreover, in this embodiment, the bobbin 20 has a terminal block connection part 22 that can be connected to the terminal block 80. With such a configuration, the terminal block 80 can be easily attached to the bobbin 20 via the terminal block connection part 22.

In this embodiment, as shown in FIG. 4A, since the terminal block connection part 22 is formed only on one side of the X axis of the bobbin 20, the terminal block 80 shown in FIG. 6A is also formed on one side of the X axis of the bobbin 20. It will be placed only on the side. Therefore, it is possible to achieve miniaturization compared to a conventional transformer in which the terminal block 80 is formed on both sides of the X-axis of the bobbin 20.

Further, in this embodiment, the terminal block 80 is arranged on one side of the X-axis of the bobbin 20 and has a long shape in the Y-axis direction. That is, both ends of the terminal block 80 in the Y-axis direction protrude toward a dead space (a corner of a square space inscribed with an ellipse) located outside the elliptical bobbin body 24. In this way, by arranging the terminal block 80 while effectively utilizing the dead space of the transformer 10, it is possible to contribute to miniaturization of the transformer 10.

Furthermore, in the present embodiment, the terminal block 80 can be attached to the terminal block connecting portion 22 of the bobbin 20 in a direction substantially perpendicular to the winding axis (Z-axis) of the bobbin 20 (X-axis direction). Therefore, the height positions of the lead connection portions 68α and the external connection portions 69 of the terminals 60a to 60d provided on the terminal block 80 can be easily positioned with respect to the bobbin 20 with high precision, and the lead portions 37a, 37b , 38a, 38b becomes easy to connect. Furthermore, positioning of the terminals 60a to 60d of the transformer 10 to the external terminals connected to the external connection portion 69 becomes easy.

Further, as shown in FIG. 3, the lead connection portions 68α and 68β of the respective terminals 60a to 60d protrude horizontally from the terminal block 80 to the outside of the X axis at approximately equal intervals in the Y axis direction, so that the terminal 60a 60d and the lead portions 37a, 37b, 38a, and 38b are easily connected. Further, the external connection portions 69 of each of the terminals 60a to 60d are arranged at approximately equal intervals in the Y-axis direction and protrude further outward in the X-axis direction than the lead connection portions 68α and 68β.

Further, in this embodiment, one first lead portion 37a of the first wire 37 shown in FIG. 7 is pulled out toward the vicinity of one end in the Y-axis direction of the terminal block 80 shown in FIG. One second lead portion 38 a of the two wires 38 is pulled out toward the vicinity of the other end of the terminal block 80 . The other first lead part 37b of the first wire 37 and the other second lead part 38b of the second wire 38 are pulled out from the center of the terminal block 80 in the Y-axis direction so as to be located on opposite sides of each other. , are insulated from each other by an insulating adapter 70 shown in FIG. 4B. That is, in the present embodiment, the other first lead part 37b of the first wire 37 and the other second lead part 38b of the second wire 38 are arranged outside and inside the insulating adapter 70 and are insulated. There is.

With this configuration, the first lead portion 37a is pulled out a sufficient distance to near one end of the terminal block 80, and then the first lead portion 37a is pulled out toward the terminal 60a near the one end of the terminal block 80. This makes it possible to start up the first lead portion 37a, and the first lead portion 37a is less likely to be loosened or curved. Therefore, the first lead portion 37a can be stood up compactly toward the terminal 60a near one end of the terminal block 80, and the transformer 10 can be made smaller. Note that similar effects can be obtained with the second lead portion 38a.

Furthermore, by insulating the other first lead portion 37b of the first wire 37 and the other second lead portion 38b of the second wire 38 with the insulating adapter 70, short-circuit defects can be prevented between the respective lead portions 37b and 38b. Occurrence can be prevented. Further, it is possible to secure a sufficient spatial distance between the first lead part 37b and the second lead part 38b, and to improve the insulation between the first lead part 37b and the second lead part 38b. I can do it.

Further, the other first lead portion 37b of the first wire 37 and the other second lead portion 38b of the second wire 38 are arranged on the outside and inside of the insulating adapter 70 (side surface portion 71). With such a configuration, the other first lead part 37b of the first wire 37 and the other second lead part 38b of the second wire 38 are separated by the insulating adapter 70, and the first lead part 37b and the second lead part 38b of the second wire 38 are separated by the insulating adapter 70. Insulation between the two lead parts 38b can be effectively achieved.

Furthermore, in this embodiment, by locking the first lead part 37a to the extension collar part 331, it is possible to effectively prevent the first lead part 37a from shifting, and to connect the first lead part 37a to the terminal. It becomes easier to stand up the stand connecting part 22.

Further, in this embodiment, the first wire 37 and the second wire 38 are α-wound around the winding tube portion 28 . With this configuration, the height of the transformer 10 can be reduced, and the leakage characteristics of the transformer 10 can be easily adjusted.

Furthermore, in the transformer 10 of this embodiment, as shown in FIG. 2B, fixed parts 64α, 64β of the terminals 60a to 60d and an external connection part 69 are arranged along the X axis, and a wire connection is made between them. Portions 68α and 68β are formed. Therefore, as shown in FIG. 3, even if a plurality of terminals 60a to 60d are arranged on the terminal block 80, the insulation between adjacent terminals 60a to 60d can be excellent, and space can be saved. It also contributes to downsizing of the transformer 10 shown in FIG.

Further, in this embodiment, the external connection portion 69 of each of the terminals 60a to 60d is an insert piece formed by bending at a predetermined angle (90 degrees) from the connecting portions 66α, 66β, which are a part of the base plates 62α, 62β. have Each external connection part 69, which is a plug-in piece, has a plug-in edge 69a that can be inserted into an external circuit board (not shown) along the Z-axis.

With this configuration, the terminals 60a to 60d can be easily formed from a conductive plate material such as a metal plate by press working or the like. Moreover, even if a plurality of terminals 60a to 60d are arranged on the terminal block 80, the insulation between the terminals 60a to 60d is excellent, and space can be saved. It also contributes to downsizing of the transformer 10.
Furthermore, connection of the terminals 60a to 60d to an external circuit board becomes extremely easy.

Further, as shown in FIG. 1A, the transformer 10 includes a terminal cover 100 having a contact portion 102 that can come into contact with the opposite insertion edge 69b of the insertion piece. , the terminal cover 100 takes charge of the reaction force when each external connection part 69, which is a plug piece, is inserted into the receiving terminal (not shown) of the external circuit board, and the connection of the terminals 60a to 60d to the external circuit board is becomes even easier. Further, no excessive force is applied to each terminal 60a to 60d.

Further, as shown in FIG. 2B, in each of the terminals 60a to 60d, a notch 67 is formed at the bent intersection of the tip of the connecting portions 66α, 66β and the external connecting portion 69. With this configuration, distortion and deformation of the external connection part 69, which is the insertion piece, can be effectively prevented, and the external connection part 69 can be easily inserted into the receiving terminal of the external circuit board.

Furthermore, in this embodiment, the external connection portion 69 and the lead connection portion 68α or 68β may be displaced from each other along the Y-axis in each of the terminals 60a to 60d. With this configuration, the wire lead portions 37a, 37b, 38a, or 38b can be easily connected to the lead connection portions 68α or 68β by soldering, fusing, or the like.

Further, in this embodiment, as shown in FIG. 4A, the terminal block connecting portion 22 is formed with bobbin side notches 23a to 23d through which the lead portions 37a, 37b, 38a, and 38b pass, respectively. The lead portions 37a, 37b, 38a, and 38b are drawn out through the bobbin side notches 23a to 23d located between the terminal block 80 and the terminal block connecting portion 22, respectively. With this configuration, the insulation between the plurality of lead parts 37a, 37b, 38a, and 38b can be improved.

Furthermore, guide grooves 82a to 82d are formed in the terminal block 80 to guide the lead portions 37a, 37b, 38a, and 38b that have passed through the bobbin side notches 23a to 23d to the lead connection portions 68α and 68β. With this configuration, it becomes easier to guide the lead portions 37a, 37b, 38a, and 38b to the lead connection portions 68α and 68β, respectively, and the connection of the lead portions 37a, 37b, 38a, and 38b becomes easier.

Further, in this embodiment, as shown in FIG. 4A, on both sides of the terminal block connecting portion 22 in the Y-axis direction, engagement grooves 84b and 86b formed in the terminal block 80 shown in FIG. 6 are provided. A joining piece 22c is provided. By fitting the engagement pieces 22c into the engagement grooves 84b and 86b, the work of joining the terminal block 80 and the bobbin 20 becomes easier, and the positioning of the terminal block 80 on the bobbin 20 also becomes easier. Further, the terminal block 80 can be firmly connected to the terminal block connecting portion 22.

Furthermore, in this embodiment, as shown in FIG. 4A, the connecting parts 62α and 62β of the terminals 90a to 90d and the lead connecting parts 68α and 68β are connected to the terminal block 80 or the terminal block connection part 22 from below in the Z-axis direction. An insulating support 90 may be attached to hold and insulate. With this configuration, the terminals 60a to 60d that protrude long from the terminal block 80 can be stably supported.

Note that a mounting recess 92 may be formed on the bottom surface of the support body 90 in the Z-axis direction along the Y-axis. For example, the upper end of a casing for accommodating potting resin is attached to the attachment recess 92. In this case, the external terminals 69 of each of the terminals 60a to 60d held by the terminal block 80 and the support body 90 protrude outward in the X-axis direction from the upper end of the casing.

Further, in this embodiment, the fixing parts 64α and 64β of the terminals 60a to 60d shown in FIG. 2B are fixed to the terminal mounting parts 83a to 83d of the terminal block 80 by insert molding, as shown in FIG. With this configuration, even if a plurality of terminals 60a to 60d are arranged on the terminal block 80, the insulation between adjacent terminals 60a to 60d is excellent, and space can be easily saved.

Note that the present invention is not limited to the embodiments described above, and can be variously modified within the scope of the present invention.

In each of the above embodiments, an example of application of the present invention to a transformer has been described, but the present invention can be applied not only to a transformer but also to other coil devices.

Further, in each of the above embodiments, the magnetic core is constructed by combining the E core and the E core, which are split cores, but the magnetic core may be assembled by combining the E core and the I core.

Furthermore, the first coil part 35 and the second coil part 36 may be arranged in the opposite direction to the above embodiment along the winding axis of the bobbin 20, and the first lead parts 37a, 37b The arrangement of the second lead portions 38a and 38b may be reversed.

Further, in the above embodiment, the X axis as the first axis, the Y axis as the second axis, and the Z axis as the third axis are substantially perpendicular to each other, but the angle of these axes is 90°. It is not limited to degrees, but may be other angles.

Furthermore, in this embodiment, the terminal fittings 60a to 60d may be fixed to the terminal block 80 by means other than insert molding. Further, in the embodiment described above, the terminal block 80 is molded separately from the bobbin 20, and the terminal block 80 is attached to the terminal block attachment part 22 of the bobbin 20 from the X-axis direction. The terminal block mounting portion 22 may be mounted from above in the Z-axis direction. Alternatively, the terminal block 20 may be integrally formed with the bobbin 20.

Furthermore, in this embodiment, the four terminals 60a to 60d are attached to a single terminal block 80, but for example, a pair of terminals 60a and 60b are attached to one terminal block, and the other pair of terminals 60c and 60d are attached to the other terminal block. These terminal blocks may be attached to both ends of the bobbin 20 in the X-axis direction. Further, the internal structure of the bobbin may be a double-tube structure, and the second coil portion 36 may be disposed insulated on the outside of the first coil portion 35, or vice versa.

10... Transformer 20... Bobbin 22... Terminal block connection part 22a... Base part 22b... Insulating wall 22c... Engagement piece 22d... Engagement groove 23a to 23d... Bobbin side notch (bobbin groove)
23b1...Slit groove 24...Bobbin body 25...Step part 250...Step wide part 250a...Protrusion 26...Through hole for core leg 27...Separation convex part 28...Winding cylinder part 29 ... Projection piece 30... Insulating partition flange 31, 32... End partition flange 33, 34... Winding partition flange 331... Extension flange 33a, 34a... Communication groove 35... First coil part 36... Second coil part 37 ... First wire 37a, 37b... First lead part 38... Second wire 38a, 38b... Second lead part 40a, 40b... Magnetic core 42a, 42b... Split core 44a, 44b... Base part 46a, 46b... Middle leg part 48a, 48b... Side leg portion 50... Cover 52... Cover body 54... Locking piece 540... Locking protrusion piece 540a... Hole 56... Side leg guide piece 60a-60d... Terminal 62α, 62β... Base plate 64α, 64β... Fixing Parts 66α, 66β... Connection part 67... Notch 68α, 68β... Lead connection part (wire connection part)
69... External connection part 69a... Plug-in edge 69b... Opposite insertion edge 70... Insulation adapter 71... Side part 72... Top part 73... Bottom part 76... Guide groove 80... Terminal block 82... Rod member 82a, 82b, 82c , 82d... Guide notch (guide groove)
83a to 83d... Terminal attachment portion 84, 86... End block 84a, 86a... Engagement hook 84b, 86b... Engagement groove 88... Engagement protrusion 90... Support body 92... Attachment recess 100... Terminal cover (cover member)
102... Contact portion 110... Heat dissipation sheet

Claims (13)

a bobbin around which the wire is wound;
a terminal to which the lead portion of the wire is connected;
A coil device comprising a terminal block to which the terminal is attached,
The terminal is
a fixing part fixed to the terminal block;
an external connection part formed integrally with the fixing part at a tip position protruding from the terminal block along the first axis;
A terminal block protrudes from the terminal block and is formed integrally with the external connection part at a position between the fixed part and the external connection part along the first axis, and the lead part is inserted and connected. a wire connection;
has
The fixed part and the external connection part are integrally connected by a connection part exposed from the terminal block,
The wire connection part is integrally molded on the connection part,
The external connecting portion is a coil device having an insertion piece formed by bending at a predetermined angle from the connecting portion. a bobbin around which the wire is wound;
a terminal to which the lead portion of the wire is connected;
A coil device comprising a terminal block to which the terminal is attached,
The terminal is
a fixing part fixed to the terminal block;
an external connection part formed integrally with the fixing part at a tip position protruding from the terminal block along the first axis;
A terminal block protrudes from the terminal block and is formed integrally with the external connection part at a position between the fixed part and the external connection part along the first axis, and the lead part is inserted and connected. a wire connection;
has
The fixed part and the external connection part are integrally connected by a connection part exposed from the terminal block,
The fixing part and the connecting part are continuously formed as part of a base plate,
The wire connecting portion is formed by folding back from a side edge of the connecting portion so as to be able to sandwich the lead portion, and
The external connecting portion is a coil device having an insertion piece formed by bending at a predetermined angle from the connecting portion. The fixing part and the connecting part are continuously formed as part of a base plate,
2. The coil device according to claim 1 , wherein the wire connecting portion is formed by folding back from a side edge of the connecting portion so that the lead portion can be sandwiched therebetween. The coil device according to any one of claims 1 to 3, wherein the insertion piece has an insertion edge that can be inserted into an external board along a third axis parallel to the winding axis of the wire. . 5. The coil device according to claim 4, further comprising a cover member having an abutment portion that can come into contact with an anti-insertion edge of the insertion piece opposite to the insertion edge. 6. The coil device according to claim 1, wherein a notch is formed at a bending intersection between the tip of the connecting portion and the insertion piece. 7. The coil device according to claim 1, wherein the external connection portion and the wire connection portion are displaced from each other along a second axis intersecting the first axis. 8. The coil device according to claim 1 , wherein the terminal block is configured separately from the bobbin, and is attached to a terminal block connecting portion of the bobbin. A bobbin groove for passing the lead part is formed in the terminal block connection part,
The coil device according to claim 8, wherein the lead portion is drawn out through the bobbin groove located between the terminal block and the terminal block connecting portion. 10. The coil device according to claim 9 , wherein a guide groove is formed in the terminal block to guide the lead portion that has passed through the bobbin groove to the wire connection portion. 11. The coil device according to claim 8 , wherein the terminal block connecting portion includes an engagement piece that engages with an engagement groove formed in the terminal block. The coil device according to any one of claims 8 to 11, wherein a support body is attached to the terminal block or the terminal block connecting part to hold and insulate the connecting part of the terminal from below. 13. The coil device according to claim 1 , wherein the fixing portion of the terminal is fixed to the terminal block by insert molding.

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