JP2009111048A - Coil component and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil component in which a mounting surface can be flattened and a terminal can be held in a stable state, and to provide a manufacturing method thereof. <P>SOLUTION: The coil component includes: a main body in which a terminal base is provided so as to project from the side wall of a bobbin around which a coil is wound, and the tip of the coil is tied up to the terminal inserted into a through-hole penetrating the terminal base between top and rear surfaces from the top surface; a case containing the main body with the terminal projected therefrom and having a flat rear surface; and a resin charged in the case while the main body is contained therein, wherein the terminal has a bend the one end of which is tied up to the coil, and the other end of which is inserted into the through-hole so as to be locked to the terminal base at the bend point, and the main body is contained so that the other end of the terminal is inserted into a hole formed at the rear surface of the case, and projects from the rear surface of the case. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a coil component such as a transformer or a choke, and more particularly to a mold type coil component in which a body such as a bobbin around which a coil is wound is accommodated in a case, and the case is filled with resin, and a method for manufacturing the same. Is.

  A conventional coil component is disclosed in Patent Document 1 as a transformer. According to the patent document, the transformer body 12 in which the coil 1 is wound around the coil bobbin 2 is accommodated in the insulating protective case 4, and the silicon casting resin 5 is injected into the case 4 and formed therein. It is shown.

  In addition, the terminal 7 of the transformer of Patent Document 1 is attached to a coil bobbin, the tip of the coil 1 is entangled at one end thereof, and the other end protrudes from the insulating protective case 4.

  The coil binding is not particularly mentioned in Patent Document 1, but, for example, the secondary terminal 25 is formed in an L-shape as in the secondary terminal 25 disclosed in Patent Document 2, and one end of the secondary terminal 25 is formed. It is also conceivable to adopt a structure in which the tip of the coil 1 is entangled and the other end is used for connection to the outside.

  By the way, in the transformer of Patent Document 1, silicon casting resin 5 (hereinafter abbreviated as resin) is injected in a state where the transformer main body 12 is accommodated in the insulating protective case 4, so that the terminal 7 is not buried. A state in which resin is injected is illustrated (see FIG. 1 of Patent Document 1).

In the resin 5 injection structure disclosed in Patent Document 1, the resin is injected only to the extent that the terminal 7 is not buried, and the connection portion between the terminal 7 and the coil bobbin 2 is exposed. Therefore, this connection part is not protected by the resin and has low reliability. Therefore, it is also conceivable to improve the reliability by increasing the injection amount of the resin until it covers a part of the terminal so that the connection part is protected by the resin (see FIG. 5 in this specification).
6-44117 JP 2004-228268 A (see FIG. 5)

  However, in the conventional structure as shown in FIG. 5, the resin adheres so as to rise around the terminals due to the surface tension of the resin. As a result, the surface of the resin cannot be flattened, and a problem may occur when the coil component is mounted on the substrate.

  In addition, since the conventional coil parts are only attached to the bobbin and held by the resin, when a stress is applied to the terminal, the terminal is likely to swing, and the terminal swings, for example, the terminal There is a possibility that the coil entangled in the wire may be disconnected or the coil tip may be entangled.

  Accordingly, the present invention has been made in view of the above-described circumstances, and an object of the present invention is to flatten the mounting surface of the coil component, and to provide a coil component capable of holding the terminal in a stable state and a method for manufacturing the same. Is to provide.

  The present invention was devised to achieve the above object, and a terminal block is provided so as to protrude from the side wall of the bobbin around which the coil is wound, and penetrates between the front surface and the back surface of the terminal block. A main body in which the tip of a coil is entangled with a terminal inserted from the surface into a through-hole, a case with a flat back surface for accommodating the main body so that the terminal protrudes, and a case with the main body accommodated In the coil component including the resin filled therein, the terminal has a bend, one end thereof receives the binding of the coil, the other end is inserted into the through hole, and is engaged with the terminal block at the bend point. The other end of the terminal is inserted into a hole provided in the bottom surface of the case, and the main body is accommodated so that the other end protrudes from the back surface of the case.

The terminal block may be formed integrally with the bobbin.
The terminal block may have a suppressing portion that suppresses rotation of the terminal inserted into the through hole.
The terminal may be bent in an L shape.

The terminal block has a groove extending outward from the through hole on the surface as a restraining portion, and one end of the terminal is disposed in the groove, and the coil is entangled at a portion protruding from the groove. You may do it.
You may accommodate in a case so that the back surface of the terminal block of a main body may contact | abut to the bottom face in a case.
The hole may have a taper inside the case.

  A terminal block is provided so as to protrude from the side wall of the bobbin around which the coil is wound, and the tip of the coil is entangled with a terminal inserted from the surface into a through-hole penetrating between the front and back surfaces of the terminal block. In a method of manufacturing a coil component, comprising: a main body formed by: a case having a flat back surface that accommodates the main body so that the terminal protrudes; and a resin filled in the case in a state in which the main body is accommodated. A body-forming step in which the other end of the bent terminal is inserted into the through-hole, is fastened to the terminal block at the bending point, and the tip of the coil is entangled at one end, and a hole provided in the bottom surface of the case And a housing step for housing the main body so that the other end of the terminal is inserted and the other end protrudes from the back surface of the case, and a resin filling step for filling the resin into the case after housing. Features.

The terminal block and the bobbin may be integrally formed.
You may make it form the suppression part which suppresses rotation of the terminal inserted by the through-hole in the terminal block.
The terminal may be bent in an L shape.

A groove extending outward from the through hole is formed on the surface of the terminal block as a restraining portion, one end of the terminal is arranged in the groove, and the tip of the coil is entangled with one end of the terminal protruding from the groove. Also good.
In the housing step, the back surface of the terminal block of the main body may be brought into contact with the bottom surface in the case.
The hole may be formed to have a taper inside the case.

According to the present invention, the terminal is bent, the one end thereof receives the binding of the tip of the coil, the other end is inserted into a through hole provided in the terminal block, and is locked to the terminal block at the terminal bending point. . And after accommodating this main body so that the other end of a terminal may be inserted by the hole provided in the bottom face of the case, resin is filled in the case. As a result, the other end of the terminal is inserted into a through hole provided in the terminal block, and further inserted into a hole provided in the bottom surface of the case, and the terminal is held in a stable state by a structure for holding these terminals. Can do.
In addition, according to the present invention, the terminal protrudes from the inside of the case toward the flat back surface, and the flat back surface of the case becomes the mounting surface, so that the coil component can be mounted on the substrate in a stable state.
Furthermore, according to the present invention, when the main body is accommodated in the case, the terminal can be brought into close contact with the terminal block by bending the terminal by pulling out the terminal from the bottom of the case, and at the same time, the hole provided in the bottom of the case By sliding with the terminal to be inserted, it is possible to obtain close contact between the case and the terminal and to hold the terminal in a more stable state.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same components are denoted by the same reference numerals in the drawings used in the embodiments, and overlapping descriptions are possible. Omitted as much as possible.

  The coil component of the present invention is a transformer, a choke or the like, and is called a mold type in which a main body made of a bobbin or the like around which a coil is wound is housed in a case, and the case is filled with resin. In the following description, a mold transformer will be described as an example.

  As shown in FIG. 1, the mold transformer 10 of the present invention includes a main body 20, a case 30 that houses the main body, and a resin 40 that fills the case. In the drawings used for the description, hatching notation is omitted as necessary to facilitate understanding of the configuration. For example, in FIG. 1, hatching notation regarding the main body 20 and the resin 40 is omitted.

  As shown in FIG. 2, the main body 20 includes a coil 21, a bobbin 22 around which the coil 21 is wound, a magnetic core 27 attached thereto, and a terminal 23 attached to the bobbin.

  The bobbin 22 has a terminal block 24 protruding outward on the side surface. The terminal block 24 is formed of a resin integrally with the bobbin 22, and a desired engagement strength is secured at an engagement site with the bobbin 22. In addition, the terminal block 24 may be manufactured separately from the bobbin 22, and the manufactured terminal block 24 may be retrofitted to the side surface of the bobbin 22. In this case, the engagement that can ensure the engagement strength between the bobbin 22 and the terminal block 24 is possible. It is necessary to adopt a structure.

Here, the terminal block 24 and the terminal 23 will be described in detail.
The terminal 23 is formed by bending a rod-shaped conductive member, and is formed into an L shape by bending. The terminal 23 formed in an L shape is entangled at one end of the coil, and the other end is electrically connected to the outside.

  As shown in FIG. 2B, the terminal block 24 is provided with a through hole 25 penetrating from the front surface to the back surface. The other end of the terminal 23 is inserted into the through hole 25 and is inserted from the surface of the terminal block 24.

  The inner diameter dimension of the through hole 25 is formed according to the diameter dimension of the terminal 23, specifically, slightly narrower than the diameter dimension of the terminal 23. As a result, when the terminal 23 is inserted into the through hole 25, sliding between the inner wall of the through hole 25 and the surface of the terminal 23 can be suppressed, and the terminal 23 can be held in a stable state with a frictional force. Can do.

  By the way, the terminal block 24 is formed with a suppressing portion that suppresses the rotation of the terminal 23 inserted into the through hole 25. As shown in FIG. 2, the suppressing portion is a so-called groove 26, and the groove 26 extends from the through hole 25 toward the outside of the terminal block 24.

  As shown in FIG. 2, one end of the other end 23 is disposed in the groove 26 of the terminal block 24. That is, the other end of the terminal 23 is inserted into the through hole 25, and is locked to the terminal block 24 at a bent portion (bent point) of the terminal by pressing when inserting. At that time, one end of the terminal 23 is fitted into the groove 26 extending from the through hole 25.

  The groove 26 is formed so that the groove width dimension is slightly narrower than the diameter dimension of the terminal 23, and the terminal to be fitted can be held in a stable state.

  By the way, one end of the terminal 23 fitted in the groove 26 has a tip protruding from the groove 26, and the tip of the coil 21 is entangled at a portion protruding from the groove 26 (see FIG. 2B). ), Fixed by solder.

  As shown in FIG. 3, the case 30 has a box-like shape based on a cube, and one of its surfaces is open. The main body 20 is inserted into the case 30 from this opening (see FIG. 4).

As shown in FIG. 3E, a step for positioning is provided as a pedestal 31 inside the case 30, and the end of the magnetic core 27 of the main body 20 to be accommodated is disposed on the pedestal 31.
At this time, the bottom portion of the main body 20, more specifically, a part of the bottom portion of the bobbin 22 and the bottom portion of the terminal block 24 are disposed so as to touch the bottom surface of the case 30.

  The pedestal 31 is provided with a screw hole 33 on the bottom surface, and is used for screwing a screw to firmly connect the substrate and the coil component when the coil component is mounted on the substrate using solder.

Incidentally, a hole 32 is provided in the bottom surface of the case 30, and the hole 32 has a taper as shown in FIG.
In the main body 20 accommodated in the case 30, the terminal 23 is inserted into a hole 32 provided on the bottom surface of the case 30, and the tip of the inserted terminal 23 protrudes from the back surface of the case 30. The taper provided in the hole 32 makes it easy to introduce the terminal 23 into the hole 23 when the hole is inserted.

  Also, the inner diameter of the hole 32 is formed in accordance with the diameter of the terminal 23, similarly to the through-hole 25, and specifically, is slightly narrower than the diameter of the terminal 23. Thus, when the terminal 23 is inserted into the hole 32, sliding between the inner wall of the hole 23 and the surface of the terminal 23 can be suppressed, and the terminal 23 can be held in a stable state with a frictional force. it can.

  As described above, when the coil component 10 of the present invention accommodates the main body 20 in the case 0, the main body 20 is placed inside the case 30 so that the terminal 23 of the main body 20 is inserted into the hole 32 on the bottom surface of the case 30. Accommodate. Thereafter, the resin 40 is filled in the case 30 containing the main body 20 to prevent opening. Thereby, according to the coil apparatus 10 of this invention, the terminal 23 can be protruded from the flat back surface of the case 30, and the mounting surface of the coil component 10 can be planarized.

  Furthermore, in the coil component 10 of the present invention, the other end of the L-shaped terminal 23 is inserted into a through hole 25 provided in the terminal block 24, and the other end extends from the through hole 25 toward the outside of the terminal block 25. The main body 10 is accommodated in the case 30 by receiving the binding of the tip of the coil 21 at a portion protruding from the groove at one end.

  That is, in the coil component 10 of the present invention, one end receiving the binding is arranged in the horizontal direction, and the terminals 23 used for mounting on the substrate are arranged in the vertical direction. Therefore, when the coil is tangled in the vertical direction (the other end) with respect to the vertical vibration that is susceptible to stress, the tangling is easy to move in response to the vertical vibration and unraveling or disconnection is likely to occur. However, when the coil tangling is received in the horizontal direction (one end) as in the present invention, the tangling is orthogonal to the vibration direction, so that it is not easily affected by vertical vibrations. It is difficult to invite.

Next, the manufacturing method of a coil apparatus is demonstrated.
First, the bobbin 22 in which the terminal block 24 is integrally formed is formed. This formation is a resin formation using a conventionally known mold. In forming the bobbin 22, a through hole 25 and a groove 26 of the terminal block 24 are formed.

  The other end of the terminal 23 is inserted into the through hole 25 of the terminal block 24 of the formed bobbin 22, and one end is inserted into the groove, and then the coil 21 is wound around the bobbin 22. Thereafter, the end of the coiled coil is entangled with one end of the terminal 23 and fixed with solder, and a magnetic core 27 is attached to these to form a main body.

Thereafter, the main body 20 is accommodated in the case 30.
The case 30 for housing the main body 20 has a hole 32 having a taper on the bottom surface, and a surface (back surface) opposite to the surface on which the taper is formed is formed flat.

  When the main body 20 is accommodated in the case 30, the main body 20 is accommodated so that the other end of the terminal 23 faces the bottom surface of the case 30, and the other end of the terminal 23 can be easily aligned along the taper provided on the bottom surface of the case 30. It is inserted into the hole 32. At this time, the main body 20 is pressed toward the case 30, whereby the other end of the terminal 23 can be protruded from the hole 32.

  When the tip of the terminal 23 protrudes from the back surface of the case 30, it is preferable to pull out the tip. The surface of the terminal 23 drawn thereby is rubbed against the inner wall of the hole 32 of the case 30, and the case 30 and the main body 20 in a stable state.

  Furthermore, by pulling the terminal protruding from the bottom surface of the case 30, the bent portion (bending point) of the terminal can be locked to the terminal block 24 in a more stable state.

  Thereafter, the resin 40 is supplied into the case 30 in order to protect the main body 20 accommodated in the case 30 with the resin 40. When the main body 20 in the case 30 is embedded with the resin 40, the resin 40 is cured. The mold transformer 10 is manufactured as described above.

  In the mold transformer 10 manufactured in this way, the back surface of the case 30 is formed flat in advance, and the terminal 23 of the main body 20 accommodated in the case 30 is protruded from the hole 32 to the back surface. Thereby, according to the coil apparatus 10 of this invention, the terminal 23 can be protruded from the flat back surface of the case 30, and the mounting surface of the coil component 10 can be planarized.

  In the above-described embodiment, an example in which a rod-shaped conductive member is bent at a right angle to form the terminal 23 in an L shape has been described. However, the terminal 23 is not limited to this shape. The bending angle of the conductive member may be changed as appropriate. In this case, it is necessary to appropriately change the shape of the suppressing portion that suppresses the rotation of the terminal 23 according to the bending angle of the terminal 23.

  In the embodiment described above, the groove has been described as an example of the suppressing portion, but the present invention is not limited to this. For example, plate-like members are provided in parallel so as to protrude from the surface of the terminal block 24, The rotation of the terminal 23 may be suppressed by fitting one end of the terminal 23 while being spaced apart in parallel.

It is sectional drawing which shows the mold transformer of this invention, (a) is front sectional drawing, (b) is side sectional drawing. It is a figure which shows the main body of this invention, (a) is a side view, (b) is a perspective enlarged view which shows a terminal shape, (c) is a front view, (d) is a top view. It is a figure which shows the case of this invention, (a) is a top view, (b) is a front view, (c) is a bottom view, (d) is a side view, (e) is A- in plan view (b). It is A sectional drawing and the enlarged view of a hole. It is a front view of a case and a main body, and is a figure which shows the mode of the main body accommodated in a case. Sectional drawing which shows the conventional mold transformer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mold transformer 20 Main body 21 Coil 22 Bobbin 23 Terminal 24 Terminal block 25 Through-hole 26 Groove 27 Magnetic core 30 Case 31 Base 32 Hole 33 Screw hole 40 Resin

Claims (14)

A terminal block is provided so as to protrude from the side wall of the bobbin around which the coil is wound, and the tip of the coil is inserted into a terminal inserted from the surface into a through-hole penetrating between the front surface and the back surface of the terminal block. A coil component comprising: a main body that is entangled; a case having a flat back surface that accommodates the main body so that the terminal protrudes; and a resin that is filled in the case while the main body is accommodated. In
The terminal has a bend, one end of which receives the binding of the coil, the other end is inserted into the through-hole and is locked to the terminal block at a bending point,
A coil component characterized in that the other end of the terminal is inserted into a hole provided in the bottom surface of the case, and the main body is accommodated so that the other end protrudes from the back surface of the case.   The coil component according to claim 1, wherein the terminal block is formed integrally with the bobbin.   The coil component according to claim 2, wherein the terminal block has a suppressing portion that suppresses rotation of a terminal inserted into the through hole.   The coil component according to claim 3, wherein the terminal is bent in an L shape.   The terminal block has a groove extending outward from the through hole on the surface as the restraining portion, and one end of the terminal is disposed in the groove, and the coil is located at a portion protruding from the groove. The coil component according to claim 4, wherein the coil component is subjected to tangling.   6. The coil component according to claim 1, wherein the main body is accommodated in the case such that a back surface of the terminal block contacts a bottom surface in the case.   The coil component according to claim 1, wherein the hole has a taper inside the case. A terminal block is provided so as to protrude from the side wall of the bobbin around which the coil is wound, and the tip of the coil is inserted into a terminal inserted from the surface into a through-hole penetrating between the front surface and the back surface of the terminal block. A coil component comprising: a main body that is entangled; a case having a flat back surface that accommodates the main body so that the terminal protrudes; and a resin that is filled in the case while the main body is accommodated. In the manufacturing method of
A main body creation step in which the other end of the bent terminal is inserted into the through-hole, and is fixed to the terminal block at a bending point, and the tip of the coil is entangled with one end;
A housing step of housing the main body so that the other end of the terminal is inserted into a hole provided in the bottom surface of the case, and the other end protrudes from the back surface of the case;
And a resin filling step of filling the case with the resin after the housing.   9. The method of manufacturing a coil component according to claim 8, wherein the terminal block and the bobbin are integrally formed.   The method for manufacturing a coil component according to claim 9, wherein a suppression portion that suppresses rotation of a terminal inserted into the through hole is formed in the terminal block.   The method of manufacturing a coil component according to claim 10, wherein the terminal is bent in an L shape.   A groove extending outward from the through hole is formed on the surface of the terminal block as the restraining portion, one end of the terminal is disposed in the groove, and the one end of the terminal protruding from the groove The method of manufacturing a coil component according to claim 11, wherein the tip of the coil is bound.   The method for manufacturing a coil component according to claim 8 or 12, wherein, in the housing step, a back surface of the terminal block of the main body is brought into contact with a bottom surface in the case.   14. The method for manufacturing a coil component according to claim 8, wherein the hole is formed to have a taper inside the case.

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