JP3429864B2 - coil - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil used for noise removal in an electronic circuit, and particularly to the structure of its bobbin.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a common mode coil or the like used in a noise filter or the like has two windings 5 and 6 in order to simplify the winding. Each bobbin 2 is provided with a collar 3 and a partition plate 4 that insulates the two windings 5 and 6 wound on the collar 3 from the center. A leg part on one side of the two-divided magnetic core 1 is inserted into the core insertion port from both sides to form a closed magnetic path. The magnetic core 1 fixed with an adhesive tape or a magnetic core holder 7 made of a spring has been used. Generally, it is designed by extending the technology of a conventional transformer or the like, and the windings are 5 and 6, and two windings are separated by a partition plate 4 or the like to fill the central space of the annular magnetic core 1. Therefore, the thickness of the winding portion of each winding frame is increased in the vertical direction of the magnetic core by the width of the space in the central portion of the magnetic core, resulting in a tall coil.

[0003]

Recently, there has been a strong demand for thin type such as surface mounting, and in the above-described conventional shape, a space corresponding to the thickness of the cross-sectional area of the winding is required in the vertical direction. If you want to reduce the
There is a problem that efficiency is reduced and it is difficult to reduce the thickness, and improvement thereof is required.

An object of the present invention is to provide a thin coil by solving the above problems, by providing a bobbin which is inexpensive, easy to assemble, and thin in the thickness direction.

[0005]

According to the present invention, there is provided a conventional bobbin forming method in which the bobbin forming the coil is wound side by side on a single winding frame so that the legs can be wound on both sides of the magnetic core. It is divided into individual winding frames and wound, and they are fixed together by pressing the simple engagement fixing projections and grooves together, easy to handle, reliability after mounting can be secured, and moreover, A thin coil is provided by adopting a structure using a bobbin that can realize a thin shape.

That is, according to the present invention, in a coil in which a winding is provided around a ring-shaped magnetic core divided into two via a bobbin, the bobbin comprises a winding frame and a terminal block, and the winding frame is ,
It consists of a reel and a collar on both ends. The reel has a straight tubular shape,
Plate-like flanges are provided at both ends of the flange, and a protrusion-like fixing protrusion that is press-fitted into a separately provided terminal block to fix the winding frame to the terminal block is provided on the lower side surface of the flange. A pin terminal for external connection is fixed to the tip, and a step for locking and a wire passing groove are provided on the fixing protrusion, and the terminal block consists of a partition plate and a winding frame receiving plate. The plate has a size equal to the size of the bobbin, and at its lower end, an H-shaped plate-shaped bobbin receiving plate extends in the direction perpendicular to the lower end, and at the tip of the bobbin receiving plate, The coil is characterized by using a bobbin having a structure having a through hole into which the fixing projection is press-fitted.

Further, according to the present invention, in a coil in which a winding is provided around a ring-shaped magnetic core divided into two via a bobbin, the bobbin comprises a winding frame and a terminal block, and the winding frame is , Consisting of a winding shaft and flanges on both ends, the winding shaft is a straight tubular shape, plate-like flanges are provided on both ends, and a lower side surface of the flange is press-fitted into a separately provided terminal block to form a winding frame. A protrusion-shaped fixing protrusion for fixing to the terminal block is provided, and a pin terminal for external connection is fixed to the tip of this fixing protrusion, and a step portion for locking and a wire thread are attached to the fixing protrusion. A groove is provided, and an engaging groove that engages with an engaging protrusion provided on the partition plate is provided on the side surface (of the flange) of the flange that contacts the partition plate, except for the side surface that contacts the terminal block and the partition plate. The lead wire guide groove that guides the lead wire is provided on the side surface (of the tsuba) of the The partition plate has a size equal to the size of the bobbin, and an engaging projection that engages with an engaging groove provided in the flange is provided at a portion of the partition plate that comes into contact with the flange. At the lower end, an H-shaped plate-shaped winding frame receiving plate extends in the direction perpendicular to the lower end, and a through hole into which the fixing projection is press-fitted is provided at the tip of the winding frame receiving plate. The coil is characterized by using a bobbin of.

[0008]

In the coil of the present invention, since the bobbins are distributed and wound on both sides of the leg portions on both sides of the magnetic core, even if the central space has the same size, the vertical direction ( The thickness of the winding in the thickness direction) is half the thickness of the conventional bobbin structure in which the winding is provided only on one leg of the magnetic core, and the thickness can be reduced. Also, although the bobbin divided into two pieces is used, the bobbin which can be integrally fixed by press-fitting them by a simple fitting structure provided separately on the terminal block and the winding frame is separately provided. Since it is a coil, it is easy to assemble, and an economical and reliable thin coil can be provided.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 is an exploded perspective view showing an embodiment of the coil of the present invention, FIG. 2 is an external perspective view of the assembled coil of the embodiment shown in FIG. 1, and FIG. 3 is a bobbin of the embodiment shown in FIG. FIG. 4 is an enlarged perspective view of the fixing projection portion of FIG. 4, and FIG. 4 is an exploded perspective view showing another embodiment of the coil of the present invention.

FIG. 2 shows the completed state of the first embodiment of the present invention, and FIG. 1 shows the assembled state. Two U-shaped magnetic cores 1 that form a square-shaped annular magnetic core by combining two magnetic core pieces are prepared. A rectangular cylindrical winding shaft having a length substantially equal to the length of the leg portion 32 of the magnetic core 1 is prepared, and a winding frame 11 provided with square plate-shaped flanges 12 at both ends thereof is prepared.
A fixing projection 21 is provided on the lower surface of the. As shown in an enlarged view in FIG. 3, a pin terminal 23 is planted at the lower end of the fixing projection 21, and has a size such that the pin terminal 23 can be press-fitted into the through hole 20 of the bobbin receiving plate 19 of the terminal block 17 and the side surface. Is through hole 20
Is provided with a step portion 24 which is to be fitted. Further, a lead wire passage groove 25 for guiding the lead wire 26 in the vertical direction is provided on the side surface of the fixing projection 21. The winding frame 15 is provided with the winding wire 15, and the lead wire portion of the winding wire 15 is passed through the lead wire passage groove 25 of the fixing projection 21 and twisted to the pin terminal 23 directly below the fixing projection 21 to terminate. Two of these reels 11 are inserted into the through holes 20 of the terminal block 17 from above, on both sides of the terminal block 17, from above, and the step portions 24 are fitted together, so that the reel 11 is attached to the terminal block 17. Press it in so that it is fixed. Next, U is inserted into both sides of the magnetic core insertion opening 28 of the winding frame 11 from both sides.
The leg portion 32 of the V-shaped magnetic core 1 is inserted, and the back of the magnetic core 1 is sandwiched and fixed by a magnetic core holder 7 made of a spring. If necessary, a tape or the like may be wound around and fixed. The coil of the present invention is
When assembled without using an adhesive or the like and using a magnetic core in the central space of the same size, a coil having a lower height than the conventional coil was formed.

A second embodiment of the present invention will be described.
FIG. 4 shows the assembled state. A U-shaped magnetic core 1 in which two magnetic core pieces are combined to form a square-shaped annular magnetic core.
Prepare 2 pieces. A rectangular cylindrical winding shaft 14 having a length substantially equal to the length of the leg portion 32 of the magnetic core 1 is prepared, and a winding frame 11 provided with square plate-shaped flanges 12 at both ends thereof is prepared. A fixing protrusion is provided on the lower surface of the. On the side of the collar 12,
A lead wire guide groove 31 is provided. Further, on the side surface of the collar 12 on the side of the partition plate 13, an engagement groove 30 which is fitted with the engagement projection 29 provided on the partition plate 13 is provided. As shown in an enlarged view in FIG. 3, a pin terminal 23 is planted at the lower end of the fixing projection 21, and the pin projection 23 has a size such that it can be press-fitted into the through hole 20 of the bobbin receiving plate 19 of the terminal block 17 and is provided on the side surface. Is provided with a step portion 24 that fits into the through hole 20. Further, a lead wire passage groove 25 for guiding the lead wire 26 in the vertical direction is provided on the side surface of the fixing projection 21. The winding 15 is applied to the winding frame 11, and the lead wire portion of the winding 15 is passed through the lead wire passing groove 25 of the fixing projection to fix the fixing projection 2
The pin terminal 23 immediately below 1 is entwined with a wire. Two of these reels 11 are inserted into the through holes 20 of the terminal block 17 from above and on both sides of the terminal block 17 from above, and the step portions 24 are fitted together to form the engaging projections 29 of the partition plate 13. Then, the reel 11 is fitted into the engaging groove 30 of the collar 12, and the winding frame 11 is attached to the terminal block 1.
Press in so that it is fixed to 7. Next, the leg portions 32 of the U-shaped magnetic core 1 are inserted into the magnetic core insertion opening 28 of this winding frame 11 from both sides, and the back of the magnetic core 1 is sandwiched and fixed by the magnetic core holder 7 made of a spring. The coil of the present invention was easily assembled without using an adhesive or the like. Further, when the magnetic core in the central space having the same size was used, a coil having a lower height than the conventional coil was formed. Further, the lead wire guide groove eliminates the risk of disconnection due to slack of the lead wire, etc., and the engaging projections and grooves allow firm assembly.

[0012]

As described above, according to the present invention, it is possible to easily assemble and supply a thin coil at low cost.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a coil of the present invention.

FIG. 2 is an external perspective view of the assembled coil of the embodiment shown in FIG.

FIG. 3 is an enlarged perspective view of a fixing projection portion of the bobbin of the embodiment shown in FIG.

FIG. 4 is an exploded perspective view showing another embodiment of the coil of the present invention.

FIG. 5 is an external perspective view showing an example of a conventional coil.

[Explanation of symbols]

1 core 2,10 bobbins 3,12 Tsuba 4,13 Partition board 5,6,15,16 winding 7 Magnetic core holder 8,23 pin terminals 9,22 Belly 11 reels 14 reel 17 terminal block 18 standoffs 19 reel support plate 20 through holes 21 Fixing protrusion 24 steps 25, 31 Lead wire through groove 26 Lead wire 27 taper 28 Magnetic core insertion port 29 Protrusion for engagement 30 Engagement groove 31 Lead wire guide groove 32 legs

Claims (2)

(57) [Claims] 1. A circumference of an annular magnetic core divided into two,
In a coil wound through a bobbin, the bobbin is composed of a winding frame and a terminal block, the winding frame is composed of a winding shaft and flanges at both ends, and the winding shaft is a straight tubular shape and is A plate-like flange is provided, and on the lower side surface of the flange, a protrusion-like fixing protrusion that is press-fitted into a separately provided terminal block to fix the winding frame to the terminal block is provided, and at the tip of this fixing protrusion. The external connection pin terminal is fixed, the fixing projection is provided with a locking step portion and a wire passing groove, the terminal block is composed of a partition plate and a winding frame receiving plate, and the partition plate is An H-shaped plate-shaped reel receiving plate extends in a direction perpendicular to the lower end of the reel with a size equal to that of the reel. A coil using a bobbin having a structure having a through hole into which a protrusion is press-fitted. 2. Around an annular magnetic core divided into two,
In a coil wound through a bobbin, the bobbin is composed of a winding frame and a terminal block, the winding frame is composed of a winding shaft and flanges at both ends, and the winding shaft is a straight tubular shape and is A plate-like flange is provided, and on the lower side surface of the flange, a protrusion-like fixing protrusion that is press-fitted into a separately provided terminal block to fix the winding frame to the terminal block is provided, and at the tip of this fixing protrusion. A pin terminal for external connection is fixed, and a step for locking and a wire passing groove are provided on the fixing projection, and a partition is provided on the side surface (of the flange) that is in contact with the partition plate of the flange. An engaging groove that engages with an engaging projection provided on the plate is provided, and a lead wire guide groove that guides a lead wire is provided on a side surface (of the flange) other than the side surface that contacts the terminal block and the partition plate. The stand consists of a partition plate and a reel support plate, and the partition plate has a size equal to that of the reel. An engaging protrusion that engages with an engaging groove provided in the flange is provided at a portion of the partition plate that comes into contact with the flange, and an H-shaped plate-shaped reel receiving plate extends in a direction perpendicular to the lower end of the partition plate. A coil using a bobbin having a structure in which a through hole into which the fixing projection is press-fitted is provided at the tip of the winding frame receiving plate.