JP6403614B2 - Line filter - Google Patents

Description

  The present invention relates to a line filter used for various electronic devices.

In general, a line filter is mainly used to prevent a common mode noise component generated between a pair of lines and a ground in a power supply line. For example, a line filter of Patent Document 1 as shown in FIG. 10 is known.
In the line filter as shown in FIG. 10, the case 150 includes two side plates 158 protruding upward from the bottom plates 156 and 157 and an intermediate plate 151 protruding upward from between the two coil portions 133 and 143. The inner surfaces of the bottom plates 156 and 157 are in contact with the bottom surface of the coil portion on the I-type terminals 136 and 146 side. In the line filter as shown in FIG. 10, since the two coil portions are held by the case near the terminals, the I-type terminals 136 and 146 are not displaced and the positional accuracy between the terminals is improved. .

JP 2006-32659 A

However, with the recent miniaturization of electronic devices, it is desirable to reduce the size of line filters. In particular, in the case of a line filter used for a power supply line, it is often provided around the power supply circuit, and it is desired to reduce the height so as not to hinder the flow of air from the air cooling fan.
Therefore, for example, when the height is reduced from an I-type terminal to an L-type terminal, since the common mode core is arranged on the upper surface of the terminal block, the tip of the L-shaped terminal that extends outward from the side surface of the terminal block There is a problem in that it is difficult to secure an insulation distance by being close to the lower end of the core.

  The present invention seeks to provide a line filter that solves the above-mentioned problems of the prior art and has a reduced height while maintaining the accuracy of the terminal position.

In order to solve the above problems, the line filter of the present invention is:
A first cylindrical body around which the first winding is wound, a first bobbin made of a resin having a first terminal,
A second cylindrical body around which the second winding is wound; a second bobbin made of a resin having a second terminal;
The first cylindrical body and the second cylindrical body are arranged in parallel to each other in the axial direction, and are made of resin disposed between the first cylindrical body and the second cylindrical body. Case and
A common mode core that forms a common mode closed magnetic path in which legs are inserted into the first cylindrical body and the second cylindrical body;
The first bobbin and the second bobbin have a first terminal block and a second terminal block provided on both axial sides of the first cylindrical body and the second cylindrical body,
The first terminal and the second terminal are L-type terminals fixed to the first terminal block and the second terminal block, one end protruding downward and the other end extending outward from a side surface,
Terminals of the first winding and the second winding are wound around the other ends of the first terminal and the second terminal,
The case is provided with a first locking portion and a second locking portion,
The first locking portion and the second locking portion are locked to the upper surfaces of the first terminal block and the second terminal block, and the common mode core is connected to the first locking portion and the second locking block. It is arranged on the upper surface of the part,
The first locking portion is disposed as a first insulating wall between the common mode core and the first terminal, and the second locking portion is between the common mode core and the second terminal. Is arranged as a second insulating wall.

In the line filter of the present invention, as a further preferable feature,
“The first locking portion and the second locking portion are formed from the side of the first terminal block and the second terminal block from the other end of the common mode core, the first terminal, and the second terminal. It is arranged extending outwards ",
“The first locking portion and the second locking portion are, in plan view, a first terminal insertion hole and a second terminal insertion hole into which one end of the first terminal and the second terminal is inserted; Covering one terminal insertion hole and the periphery of the second terminal insertion hole ",
“The common mode core is disposed in contact with the top surfaces of the first locking portion and the second locking portion.”
“The case is provided with a holding part for fixing the normal mode core,
The normal mode core is inserted and fixed in the holding portion to form a closed magnetic circuit with the common mode core ”.

According to the line filter of the present invention, the first bobbin, the second bobbin, and the case are formed of a resin whose outer dimensions are unlikely to vary.
And since the 1st bobbin and the 2nd bobbin are latched by the case by the 1st latching | locking part and the 2nd latching | locking part, it can position accurately between the terminals each provided in two separate bobbins. .
In the line filter of the present invention, one end protrudes below the first terminal block and the second terminal block, and the other end is provided with an L-shaped terminal extending outward from the side surfaces of the first terminal block and the second terminal block. Since the winding terminal is entangled with the other end of the L-shaped terminal, the height of the winding terminal entangled with one end can be reduced.
Furthermore, in the line filter of the present invention, the first locking portion is disposed as a first insulating wall between the common mode core and the first terminal, and the second locking portion is the common mode core and the second terminal. Since the second insulating wall is disposed between the two, the insulation distance between the common mode core and the other end of the L-type terminal can be maintained while realizing a low-profile line filter.
Therefore, according to the present invention, a line filter capable of maintaining an insulation distance without increasing the number of components while realizing a low profile as compared with the configuration as in the conventional example can be obtained.

It is the line filter of the finished product of 1st Embodiment, (a) is a top view, (b) is a front view of arrow AA of (a), (c) is arrow B- of (a). It is a side view of B. It is a separate bobbin in the example of the 1st embodiment, (a) is a top view and (b) is a front view. It is a common mode core in the example of a 1st embodiment, (a) is a top view and (b) is a front view. It is a case in a 1st example of an embodiment, (a) is a top view and (b) is a front view. It is a top view when the separate bobbin in the example of 1st embodiment is integrated in a case. FIG. 2 is a cross-sectional view of the main part of FIG. 1C showing the insulation distance between the common mode core 11 and the other ends 36b and 46b of the L-type terminal in the first embodiment. The insulation distances R1 and R3 when the insulating walls 56 and 57 are provided between the L-type terminals 36b and 46b are shown, and (b) shows the common mode core 11 and the other ends 36b and 46b of the L-type terminals. Insulation distances R2 and R4 when the insulating walls 56 and 57 are not provided therebetween are shown. It is the line filter of the finished product of 2nd Example, (a) is a top view, (b) is a front view of arrow CC of (a). It is the normal mode core 60 in the example of 2nd Embodiment, (a) is a top view, (b) is a front view. This is a modified example before the separate bobbin in the present embodiment is incorporated into the case, and convex portions 56d and 57d are provided on the lower surfaces of the first and second projecting portions 56a and 57a of the case, and are fitted to the projecting portions. It shows that the concave portions (not shown) to be joined are provided on the upper surfaces of the first step portion 35 and the second step portion 45 of the bobbin. It is a perspective view which shows the line filter of a prior art example.

  Hereinafter, embodiments of the present invention will be exemplarily described based on the drawings.

(First embodiment)

  1 to 6, the line filter 1 according to this embodiment includes a common mode core 10, a first bobbin 30, a second bobbin 40, a case 50, and a fastener.

  As shown in FIG. 1 or 2, the first bobbin 30 and the second bobbin 40 are two separate bobbins made of a nonmagnetic thermosetting resin. The 1st bobbin 30 and the 2nd bobbin 40 were provided in the both sides of the 1st cylindrical trunk | drum 31, the 2nd cylindrical trunk | drum 41, the 1st cylindrical trunk | drum 31, and the 2nd cylindrical trunk | drum 41, respectively. A first winding 33 and a second winding 43 made of an insulating coated copper wire wound around the first flange 32, the second flange 42, the first cylindrical body 31 and the second cylindrical body 41. The first terminal block 34 and the second terminal block 44, the first terminal block 34 and the second terminal block 34 provided on both sides in the axial direction (Y direction) of the first cylindrical body 31 and the second cylindrical body 41. The first terminal 36 and the second terminal 46 are fixed to the terminal block 44. The first cylindrical body 31 and the second cylindrical body 41 have a rectangular inner cross section, and the cross-sectional outer shapes of the leg portions 16 of the common mode core are the first cylindrical body 31 and the second cylinder. It is formed in a rectangular shape that is slightly smaller than the inside of the cross section of the cylindrical body 41. Note that the first bobbin 30 and the second bobbin 40 may be formed of a thermoplastic resin.

  The first terminal 36 and the second terminal 46 have one ends 36a and 46a projecting downward from the lower surfaces 34a and 44a of the first terminal block and the second terminal block, and side surfaces 34b and 44b of the first terminal block and the second terminal block. And an L-shaped terminal having other ends 36b and 46b that wind the ends of the first winding 33 and the second winding 43 projecting in the axial direction (Y direction).

  A first terminal insertion hole 17a and a second terminal insertion hole 17b into which one ends 36a and 46a of the first terminal and the second terminal are inserted are formed in the first terminal block 34 and the second terminal block 44, respectively. The first terminal insertion hole 17a and the second terminal insertion hole 17b are smaller in diameter than the outer shapes of the upper surfaces 34c and 44c of the first terminal block and the second terminal block in plan view (from the front surface to the rear surface in FIG. 2A). It is formed to penetrate in the Z direction. In addition, the first terminal insertion hole 17a and the second terminal insertion hole 17b are arranged in the approximate center of the upper surfaces 34c and 44c of the first terminal block and the second terminal block in plan view, It is not in contact with the second flange 42.

  On the upper surfaces 34c and 44c of the first terminal block and the second terminal block, the other ends 36b and 46b of the first terminal 36 and the second terminal 46 are connected to the first terminal insertion hole 17a and the second terminal insertion hole 17b. A first terminal insertion groove 18a and a second terminal insertion groove 18b to be inserted are formed. The first terminal insertion groove 18a and the second terminal insertion groove 18b are formed along the axial direction (Y direction) on the upper surfaces 34c and 44c of the first terminal block and the second terminal block.

  When the ends 36a, 46a of the first terminal and the second terminal are inserted into the terminal insertion holes 17a, 17b from the upper surfaces 34c, 44c of the first terminal block and the second terminal block, the lower surfaces of the first terminal block and the second terminal block It protrudes from 34a and 44a and is fixed. Also, the other ends 36b, 46b of the first terminal and the second terminal are inserted into the first terminal insertion groove 18a and the second terminal insertion groove 18b, and axially from the side surfaces 34b, 44b of the first terminal block and the second terminal block. It protrudes in the (Y direction) (see FIG. 2A), and is fixed at the center in the Z direction by the side surfaces 34b and 44b of the first terminal block and the second terminal block (see FIG. 2B). As shown in FIG. 6 (a), a gap is provided between the other end 36b of the first terminal and a first locking portion 56 described later, and the other end 46b of the second terminal and a first stop described later. A gap is provided between the two locking portions 57.

  Each of the first winding 33 and the second winding 43 is wound around the outer circumference of the first cylindrical body 31 and the second cylindrical body 41 by one layer. Both ends of the first winding 33 are electrically connected to the other end 36b of the first terminal provided on the first bobbin 30, respectively. Both ends of the second winding 43 are electrically connected to the other end 46b of the second terminal provided on the second bobbin 40, respectively. The outer shapes of the first winding 33 and the second winding 43 are arranged inside the outer shapes of the flange portion 32 of the first bobbin and the flange portion 42 of the second bobbin. Note that each of the first winding 33 and the second winding 43 may be wound in multiple layers.

  As shown in FIG. 3, the common mode core 10 includes two U-shaped cores 11. The core 11 includes an arm portion 12 and leg portions 16 extending in a right angle direction from both ends of the arm portion 12. Have.

  As shown in FIG. 4, the case 50 is made of a nonmagnetic thermoplastic resin, and includes a bottomed square cylindrical portion 51, a first locking portion 56, and a second locking portion 57. Specifically, the case 50 includes a bottomed rectangular tube-shaped portion 51 having a side wall 53 and a bottom portion 52, and a flat plate-like 2 projecting leftward from both upper and lower ends in the axial direction (Y direction) of the bottomed square tube-shaped portion 51. Two first locking portions 56 and two flat second locking portions 57 protruding rightward from both upper and lower ends in the axial direction (Y direction) of the bottomed rectangular cylindrical portion 51. The gap H1 between the two first locking portions 56 is substantially the same as the length L1 between the flange portions 32 of the first bobbin in the axial direction (Y direction). The gap H2 between the two second locking portions 57 is substantially the same as the length L2 between the flange portions 42 of the second bobbin in the axial direction (Y direction).

  The upper surface of the 1st latching | locking part 56 is formed in planar shape. The lower surface of the first locking portion 56 is formed in a substantially planar shape, and has a first protrusion 56 a that is locked with a first step portion 35 of the first terminal block 34 described later. The upper surface of the second locking portion 57 is formed in a planar shape, and is connected in parallel with the upper surface of the first locking portion 56 and is flush with the upper surface. The lower surface of the second locking portion 57 is formed in a substantially flat shape, and has a second protrusion 57 a that is locked with a second step portion 45 of the second terminal block 44 described later. Note that the case 50 may be formed of a thermosetting resin.

The upper surfaces 34c and 44c of the first terminal block and the second terminal block have a first locking portion 56 and a second locking portion as compared with the inner bottom portions 31a and 41a of the first cylindrical body and the second cylindrical body. The thickness of the portion 57 is cut away. This is because when the legs 16 of the two cores 11 are inserted into the first cylindrical body 31 and the second cylindrical body 41, respectively, the lower end 15 of the arm portion 15 of the common mode core 10 and the first terminal. This is so that the first locking portion 56 and the second locking portion 57 can be held between the base and the upper surfaces 34c and 44c of the second terminal block.
In addition, the upper surfaces 34c and 44c of the first terminal block and the second terminal block have first and second protrusions 56a and 57a, which are locked by the first locking portion 56 and the second locking portion 57, respectively. A first step portion 35 and a second step portion 45 are formed.

  Further, as shown in FIG. 5, the case 50 is disposed between the first bobbin 30 and the second bobbin 40, and the first locking portion 56 is locked to the upper surface 34c of the first terminal block. The second locking portion 57 is locked to the upper surface 44c of the second terminal block.

  Specifically, the flange portions 32 and 42 of the first bobbin and the second bobbin are inserted into the gaps H1 and H2 between the two first locking portions 56 and the two second locking portions 57, and the first The outer ends of the flange portions 32 and 42 of the first cylindrical barrel portion and the second cylindrical barrel portion are in contact with the side wall 53 of the bottomed rectangular cylindrical portion, and the first locking portion 56 and the second locking portion 57. Are arranged on the upper surfaces 34c and 44c of the first terminal block and the second terminal block, and the first protrusion 56a and the second protrusion 57a are engaged with the first step portion 35 and the second step portion 45 and are bonded by an adhesive. It is fixed. And the bottomed square cylindrical part 51 is distribute | arranged between the 1st cylindrical trunk | drum 31 and the 2nd cylindrical trunk | drum 41, and the 1st cylindrical trunk | drum 31 and the 2nd cylindrical trunk | drum 41 are shafts. The first bobbin 30 and the second bobbin 40 are fixed to the case 50 in the XYZ directions in FIG.

  Then, the leg portions 16 of the two cores 11 are respectively inserted into the first cylindrical body portion 31 and the second cylindrical body portion 41, and the tips of both leg portions 16 of the core 11 are the first cylindrical body portion 31. And the second cylindrical body 41 are abutted with each other, and the core 11 is formed in an O-shape to form a common mode closed magnetic circuit.

  In this invention, as shown to Fig.6 (a), the 1st latching | locking part 56 is distribute | arranged as the 1st insulation wall between the arm part lower end 15 of a common mode core, and the other end 36b of a 1st terminal. At the same time, the second locking portion 57 is disposed as a second insulating wall between the arm portion lower end 15 of the common mode core and the other end 46b of the second terminal.

Specifically, the first locking portion 56 and the second locking portion 57 are in plan view (from the front surface to the back surface in FIG. 2A), and the upper surfaces 34c and 44c of the first terminal block and the second terminal block. The outer shape is larger, and is arranged so as to cover all the upper surfaces 34c and 44c of the first terminal block and the second terminal block.
When the first locking portion 56 and the second locking portion 57 are disposed on the upper surfaces 34c and 44c of the first terminal block and the second terminal block, one ends 56b and 57b of the first locking portion and the second locking portion. Comes into contact with the first flange 32 and the second flange 42. The other ends 56c and 57c of the first locking portion and the second locking portion are arranged so as to protrude outward in the axial direction (Y direction) from the side surfaces 34b and 44b of the first terminal block and the second terminal block. Has been.
When the legs 16 of the two cores 11 are inserted into the first cylindrical body 31 and the second cylindrical body 41, respectively, and the core 11 is formed into an O shape, the arm of the common mode core The entire lower end 15 is disposed in contact with the upper surfaces of the first locking portion 56 and the second locking portion 57, and the common mode core 10 is fixed to the first bobbin 30 and the second bobbin 40.
And the 1st latching | locking part 56 and the 2nd latching | locking part 57 which protruded from the side surfaces 34b and 44b of the 1st terminal block and the 2nd terminal block are the arm part 12 of a common mode core, a 1st terminal, and a 2nd terminal. The other ends 36b and 46b are extended outward in the axial direction (Y direction).

  The stopper is formed in a U shape so as to closely contact the two cores 11 and is attached from the side surface 40a side of the second bobbin 40 so as to sandwich the two cores 11 from the axial direction (not shown). ).

Thus, in this example, the first cylindrical body 31 around which the first winding 33 is wound, the first bobbin 30 made of resin having the first terminal 36, and the second winding 43 are wound. The second cylindrical body 41, the second bobbin 40 made of resin having the second terminal 46, the first cylindrical body 31 and the second cylindrical body 41 are arranged in parallel to each other in the axial direction. The leg portion 16 is formed on the case 50 made of resin disposed between the first cylindrical body 31 and the second cylindrical body 41, and the first cylindrical body 31 and the second cylindrical body 41. And a common mode core 10 that forms an inserted common mode closed magnetic circuit.
The first bobbin 30 and the second bobbin 40 have a first terminal block 34 and a second terminal block 44 provided on both sides in the axial direction of the first cylindrical body 31 and the second cylindrical body 41.
The first terminal 36 and the second terminal 46 are fixed to the first terminal block 34 and the second terminal block 44, and one ends 36a and 46a protrude downward and the other ends 36b and 46b extend outward from the side surfaces. L-type terminal.
The terminals of the first winding 33 and the second winding 43 are wound around the other ends 36b and 46b of the first terminal and the second terminal.
The case 50 is provided with a first locking portion 56 and a second locking portion 57.
The first locking portion 56 and the second locking portion 57 are locked to the first terminal block and the upper surfaces 34c and 44c of the second terminal block, and the common mode core 10 is locked to the first locking portion 56 and the second locking block 56c. Arranged on the upper surface of the locking portion 57.
The first locking portion 56 is disposed as a first insulating wall between the common mode core 10 and the first terminal 36, and the second locking portion 57 is connected to the common mode core 10 and the second terminal 46. Is arranged as a second insulating wall.

According to the line filter of this example, the first bobbin 30, the second bobbin 40, and the case 50 are formed from a resin whose outer dimensions are difficult to vary.
And since the 1st bobbin 30 and the 2nd bobbin 40 are latched by the case 50 by the 1st latching | locking part 56 and the 2nd latching | locking part 57, between the terminals each provided in two separate bobbins Can be positioned accurately.
Further, in the case of an I-type terminal as in the conventional example, since the winding terminal is entangled with the I-type terminal that protrudes downward from the terminal block, the height of the line filter is increased by this amount. On the other hand, in this example, one end protrudes downward and the other end is provided with an L-shaped terminal extending outward from the side surface of the terminal block. The height can be reduced.
However, when the height is reduced from the I-type terminal to the L-type terminal, the common mode core is arranged on the upper surface of the terminal block, so the other end of the L-type terminal extending outward from the side surface of the terminal block is the common mode core There is a problem that it is difficult to secure an insulation distance in the vicinity of the lower end of the substrate. Therefore, in this example, the first locking portion and the second locking portion are locked to the upper surfaces of the first terminal block and the second terminal block, and the common mode core has the first locking portion and the second locking portion. The first locking portion is disposed as a first insulating wall between the common mode core and the first terminal, and the second locking portion is disposed between the common mode core and the second terminal. Is arranged as a second insulating wall. Therefore, the insulation distance between the common mode core and the other end of the L-type terminal can be maintained while reducing the height of the line filter of this example.
As described above, this example can obtain a line filter that is low in profile while maintaining the insulation distance without increasing the number of parts while maintaining the accuracy of the terminal position as compared with the conventional configuration.

In this example, the first locking portion 56 is disposed as a first insulating wall between the arm portion lower end 15 of the common mode core and the other end 36 b of the first terminal, and the second locking portion 57. Is arranged as a second insulating wall between the arm portion lower end 15 of the common mode core and the other end 46b of the second terminal.
Then, the insulation distance when the first insulating wall and the second insulating wall are arranged between the arm portion lower end 15 of the common mode core and the other ends 36b and 46b of the first terminal and the second terminal (FIG. 6). In (a) R1, R3), the first insulating wall and the second insulating wall are arranged between the arm portion lower end 15 of the common mode core and the other ends 36b, 46b of the first terminal and the second terminal. The distance is longer than the insulation distance (R2, R4 in FIG. 6B).

  R1 and R3 in FIG. 6A are common mode cores in the case where insulating walls 56 and 57 are disposed between the arm portion lower end 15 of the common mode core and the first terminal 33 and the second terminal 43, respectively. The insulation distance between the arm lower end 15 and the other ends 36b and 46b of the first terminal and the second terminal is shown. R2 and R4 in FIG. 6B are the arm portions of the common mode core when the insulating walls 56 and 57 are not arranged between the arm portion lower end 15 of the common mode core and the first terminal and the second terminal. The insulation distance between the lower end 15 and the other ends 36b and 46b of the first terminal and the second terminal is shown.

(Insulation distance R1, R2)
In FIG. 6A, the first locking portion 56 and the second locking portion 57 provided as insulating walls are the arm portion lower end 15 of the common mode core, the other end 36b of the first terminal and the second terminal, 46b, and extended outward from the lower end 15 of the arm portion of the common mode core and the other ends 36b, 46b of the first terminal and the second terminal. Then, the insulation distance R1 between the arm portion lower end 15 of the common mode core and the other ends 36b and 46b of the first terminal and the second terminal is equal to the first locking portion 56 and the second locking portion provided as insulating walls. It can be formed longer than the insulation distance R2 when the insulation wall is not provided.

(Insulation distance R3, R4)
Further, in the plan view of FIG. 6A (when viewed from the left side to the right side of the drawing), the first locking portion 56 and the second locking portion 57 have the first terminal and the one ends 36a and 46a of the second terminal. The first terminal insertion hole 17a and the second terminal insertion hole 17b to be inserted and the peripheral edges of the first terminal insertion hole 17a and the second terminal insertion hole 17b are covered.
Specifically, in the plan view of FIG. 6A, the first locking portion 56 covers the first terminal insertion hole 17a and the periphery near the opening end thereof, and the second locking portion 57 is the first locking portion 57. The two-terminal insertion hole 17b and the peripheral edge near the opening end are covered.
Then, in the plan view of FIG. 6A, an extended portion 80 of the insulation distance is formed at the overlapping portion of the first locking portion 56 and the peripheral edge of the first terminal insertion hole 17 a, and the second locking portion 57 An extended portion 80 of the insulation distance is formed at a portion overlapping the periphery of the second terminal insertion hole 17b.
Therefore, the insulation distance R3 between the arm portion lower end 15 of the common mode core and the other ends 36b and 46b of the first terminal and the second terminal is extended by the above-described overlapping portion, and the insulating wall is not formed. It is formed longer than the insulation distance R4.

  As described above, this example can increase the insulation distance between the common mode core, the first terminal, and the other end of the second terminal without increasing the number of components, as compared with the configuration of the conventional example. The insulation distance R1 and the insulation distance R3 are preferably the same.

Further, the common mode core 10 is disposed in contact with the upper surfaces of the first locking portion 56 and the second locking portion 57. Therefore, the first locking portion 56 and the second locking portion 57 formed as insulating walls are sandwiched between the arm portion lower end 15 of the common mode core, the first terminal block, and the upper surfaces 34c and 44c of the second terminal block. Thus, the first locking portion 56 and the second locking portion 57 are firmly fixed to the case 50, and the terminals are less likely to be displaced.

Further, the entire arm portion lower end 15 of the common mode core is arranged in contact with the upper surfaces of the first locking portion 56 and the second locking portion 57. For this reason, since the first locking portion 56 and the second locking portion 57 are more firmly fixed to the case 50, it is difficult for the terminals to be displaced, and when the line filter of the present invention is attached to the circuit board. , Reliability can be improved by minimizing stress on the common mode core.

(Second Embodiment)
Next, the configuration of the line filter according to the second embodiment of the present invention will be described with reference to FIGS.
7 to 9, the same members as those in FIGS. 1 to 6 are denoted by the same reference numerals, and the description of these members will be omitted.

  The line filter of the first embodiment can remove common mode noise by arranging the common mode core 10, but the line filter of the second embodiment has a normal mode core 60 in the first embodiment. By adding, both common mode noise and normal mode noise can be removed.

As shown in FIG. 8, the normal mode core 60 is formed in a T shape having two arm portions 61 and one leg portion 64.

  The opening of the bottomed rectangular tubular part (holding part) 51 is formed substantially the same as the outer shape of the leg part 64 of the normal mode core inserted into the bottomed rectangular tubular part 51.

  The opening direction of the bottomed rectangular cylindrical portion 51 is formed in a direction perpendicular to the axial direction of the first cylindrical barrel portion 31 and the second cylindrical barrel portion 41.

  The bottomed rectangular tubular portion 51 has a bottom portion (contact portion) 52. When the normal mode core 60 is inserted into the holding part 51, the leg part 64 of the normal mode core comes into contact with the contact part 52 and is fixed.

  In this example, the leg portions 16 of the common mode core are arranged in the first cylindrical body portion 31 and the second cylindrical body portion 41, the core 11 is formed in an O shape, and the normal mode core 60 is provided. When inserted into the bottom rectangular tubular portion 51 and abutted against the abutting portion 52, the normal mode core 60 is brought close to the common mode core 10 to obtain normal mode characteristics.

  As described above, the case 50 is provided with the holding portion 51 for fixing the normal mode core 60, and the normal mode core 60 is inserted and fixed in the holding portion 51 to form a closed magnetic circuit with the common mode core 10. doing.

  Therefore, the second embodiment can suppress common mode noise and normal mode noise in one line filter, and can contribute to the miniaturization of an electronic device equipped with the line filter of this example.

  The present invention is not limited to the embodiment described above, and can be variously modified within the scope of the gist thereof.

  In the above description, the common mode core 10 is disposed in contact with the upper surfaces of the first locking portion 56 and the second locking portion 57, but is not limited thereto. If the predetermined insulation distance can be secured, the arm portion lower end 15 of the common mode core is connected to the first locking portion 56 using the thinned first locking portion 56 and second locking portion 57 of the above-described embodiment. You may distribute | arrange with the upper surface of the 2nd latching | locking part 57 non-contact.

  In the above description, a gap is provided between the other end 36 b of the first terminal and the first locking portion 56, and a gap is provided between the other end 46 b of the second terminal and the second locking portion 57. However, the present invention is not limited to this. If the predetermined insulation distance can be secured, the other end 36 b of the first terminal is provided in contact with the first locking portion 56, and the other end 46 b of the second terminal is provided in contact with the second locking portion 57. Also good.

  Further, in the above description, the first locking portion 56 and the second locking portion 57 are arranged on the first step portion 35 and the second step portion 45 and fixed by the adhesive, but as shown in FIG. The first protrusion 56d and the second protrusion 57d are provided on the lower end surfaces of the first protrusion 56a of the first locking part and the second protrusion 57a of the second locking part, and the protrusions 56d, 57d A concave portion (not shown) to be fitted may be provided in the first step portion 35 and the second step portion 45 and may be concavo-convexly fitted.

1 Line Filter 10 Common Mode Core 11 Core 12 Common Mode Core Arm 15 Lower End of Common Mode Core Arm 16 Common Mode Core Leg 17a First Terminal Insertion Hole 17b Second Terminal Insertion Hole 18a First Terminal Insertion Groove 18b 2nd terminal insertion groove 30 1st bobbin 31 1st cylindrical trunk | drum 31a Inner bottom part of the 1st cylindrical trunk | drum 32 The collar part of the 1st cylindrical trunk | drum 33 1st coil | winding 34 1st terminal block 34a 1st terminal Lower surface of base 34b Side surface of first terminal block 34c Upper surface of first terminal block 35 First step portion 36 First terminal (L-type terminal)
36a One end of the first terminal (one end of the L-type terminal)
36b The other end of the first terminal (the other end of the L-type terminal)
40 Second bobbin 40a Side surface of second bobbin 41 Second cylindrical body 41a Inner bottom part of second cylindrical body 42 Saddle of second cylindrical body 43 Second winding 44 Second terminal block 44a Second Lower surface of terminal block 44b Side surface of second terminal block 44c Upper surface of second terminal block 45 Second step 46 46 Second terminal (L-type terminal)
46a One end of the second terminal (one end of the L-type terminal)
46b The other end of the second terminal (the other end of the L-type terminal)
50 Case 51 Square tube with bottom (normal mode core holder)
52 Bottom part of bottomed square cylindrical part (contact part)
53 Side Wall of Bottomed Square Cylindrical Part 56 First Locking Part (First Insulating Wall)
56a First protrusion of the first locking portion 56b One end of the first locking portion 56c Other end of the first locking portion 56d First convex portion of the first locking portion 57 Second locking portion (second insulating wall )
57a Second protrusion of the second locking portion 57b One end of the second locking portion 57c Other end of the second locking portion 57d Second convex portion of the second locking portion 60 Normal mode core 61 Arm portion of the normal mode core 64 Legs of normal mode core 80 Extension of insulation distance

Claims (5)

A first cylindrical body around which the first winding is wound, a first bobbin made of a resin having a first terminal,
A second cylindrical body around which the second winding is wound; a second bobbin made of a resin having a second terminal;
The first cylindrical body and the second cylindrical body are arranged in parallel to each other in the axial direction, and are made of resin disposed between the first cylindrical body and the second cylindrical body. Case and
A common mode core that forms a common mode closed magnetic path in which legs are inserted into the first cylindrical body and the second cylindrical body;
The first bobbin and the second bobbin have a first terminal block and a second terminal block provided on both axial sides of the first cylindrical body and the second cylindrical body,
The first terminal and the second terminal are L-type terminals fixed to the first terminal block and the second terminal block, one end protruding downward and the other end extending outward from a side surface,
Terminals of the first winding and the second winding are wound around the other ends of the first terminal and the second terminal,
The case is provided with a first locking portion and a second locking portion,
The first locking portion and the second locking portion are locked to the upper surfaces of the first terminal block and the second terminal block, and the common mode core is connected to the first locking portion and the second locking block. It is arranged on the upper surface of the part,
The first locking portion is disposed as a first insulating wall between the common mode core and the first terminal, and the second locking portion is between the common mode core and the second terminal. The line filter is arranged as a second insulating wall.   The first locking portion and the second locking portion are outside the side surfaces of the first terminal block and the second terminal block from the other ends of the common mode core, the first terminal, and the second terminal. The line filter according to claim 1, wherein the line filter extends toward the direction.   The first locking portion and the second locking portion are, in plan view, a first terminal insertion hole and a second terminal insertion hole into which one end of the first terminal and the second terminal is inserted, and the first terminal The line filter according to claim 1, wherein the line filter covers a terminal insertion hole and a peripheral edge of the second terminal insertion hole.   4. The line filter according to claim 1, wherein the common mode core is disposed in contact with upper surfaces of the first locking portion and the second locking portion. 5. The case is provided with a holding part for fixing the normal mode core,
5. The line filter according to claim 1, wherein the normal mode core is inserted into the holding portion and fixed to form a closed magnetic circuit with the common mode core. 6.

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