JPH07297022A - Coil - Google Patents

Abstract

PURPOSE:To provide air-core coils, in which the coils can be fed at low cost by a simple assembly work, and to provided a low-cost coil, which is stable in characteristics. CONSTITUTION:Engaging step parts 22 provided on the junction surfaces 21 between flanges 5 and 6 and tongue piece-shaped engaging pieces 17, which are assembled with these step parts 22, are provided using these flanges 5 and 6 on both sides of bobbins 1 and 2 constituting a coil and when the peices 17 are mounted on these step parts 22, engaging recessed parts 13 or engaging protrusions are respectively provided in the centers between the respective surfaces facing each other of the step parts 22 and the pieces 17. By mounting the pieces 17 on the step parts 22, the engaging protrusions are pressed into these recessed parts 13 and air-core coils 7, which can be stabilized their characteristics, are used in a structure, wherein the coils 7 can be assembled and fixed simply and reliably, using the bobbins, wherein two pieces of air-core coil intermediate assembled bodies 3 and 4 are integrally assembled without using a bonding agent or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil used in an electric circuit, and particularly to the structure of a bobbin that constitutes the coil.

[0002]

2. Description of the Related Art Generally, when a conductor wire is wound around a magnetic core having an annular magnetic path and is used as a coil, winding through the inside of the magnetic path is cumbersome and difficult to automate and expensive. Tends to be things. As a countermeasure, the magnetic core of the annular magnetic path is divided, bobbins with collars are provided at both ends of the cylindrical winding shaft, and the winding is performed on the bobbin that is open toward the outside. The end of the above is terminated to a connecting pin or the like provided on the collar to form an air core coil intermediate assembly, and two air core coil intermediate assemblies are connected and fixed by the collar portion to produce an air core coil. The coil is assembled by inserting a part of the divided magnetic core into the hollow portion of the winding shaft of the air-core coil to form an annular magnetic path. FIG. 4 shows an air-core coil 7 in which two air-core coil intermediate assemblies 3 and 4 are integrally assembled and fixed.
It is a perspective view which shows the coil assembled using. As described above, in the case of a common mode choke coil in which two windings 8 are formed on the magnetic core 10 forming one annular body and used, the two windings 8 are required to have the same characteristics. The relative positions between the windings 8 and the magnetic core 10 are required to be constant. In addition, two air core coil intermediate assemblies 3 and 4 may be incorporated in one coil and mounted on a board.
It was necessary to insert the pin terminals 9 of the respective intermediate assemblies 3 and 4 into the board, which was complicated. Therefore, as shown in FIG. 4, two air core coil intermediate assemblies 3 and 4 in which windings 8 are respectively applied to two bobbins 1 and 2 are arranged to form a joint surface 1
The air core coil 7 integrated by assembling the air core coil 1 by assembling and fixing the magnetic core 1 in the space inside the winding shaft 15 of the air core coil 7.
The coil was produced by inserting and fixing 0 to form an annular magnetic path. The pin terminal 9 of the air core coil 7 fixed integrally is used by passing it through a through hole such as a substrate. In this way, when the coil is wound, it is wound on the bobbin which is open to the magnetic path, thereby simplifying the manufacture of the air-core coil. However, in order to use the individual air-core coil intermediate assemblies 3 and 4 integrally connected, they are temporarily fixed in a shape as shown in FIG. Was there. Therefore, in this conventional structure, temporary fixing for preliminary work is required, and since the adhesive is used, the work environment is contaminated by the adhesive and time is required until the adhesive is solidified. Also, as shown in FIG.
Is pushed to the side of the joint surface 11 and accumulates, so that the adhesive 1
6 was raised, and there was a problem that the coil became unstable when the coil was mounted on the substrate. As a measure against this, it is necessary to provide a standoff 12 or the like on the substrate side of the bobbin for taking a space between the bobbin and the substrate, which hinders the thinning of the coil and complicates the die for making the bobbin.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to form an air-core coil by combining a plurality of winding-up air-core coil intermediate assemblies, and the air-core coil is magnetized. An object of the present invention is to provide an air-core coil having a structure in which a core can be attached and configured to be inexpensively supplied by a simple assembling work, and to provide an inexpensive coil with stable characteristics.

[0004]

According to the present invention, a step portion for locking (hereinafter referred to as a locking step portion) is provided on a joint surface of the collar by using the collar portions on both sides of a bobbin forming a coil. ) And a tongue-shaped projection piece (hereinafter referred to as a locking piece) to be combined therewith, and when the locking piece is assembled to this locking step portion, a recess for locking is provided at the center of each facing surface. By providing a protrusion (hereinafter referred to as a locking recess) or a protrusion (hereinafter referred to as a locking protrusion) and assembling a locking piece on the locking step, the locking protrusion is press-fitted into this locking recess, and an adhesive or the like is used. A bobbin having a structure in which two air-core coil intermediate assemblies are integrally assembled without using a bobbin, and a structure in which the air-core coil can be stably and easily assembled and fixed, and a coil using an air-core coil having stable characteristics is provided.

That is, according to the present invention, an air-core coil intermediate assembly is formed by winding a winding shaft of a bobbin in which a collar made of an insulating material is attached to both ends of a hollow winding shaft made of an insulating material. , Two of these air-core coil intermediate assemblies are joined to the joint surfaces on the side of each collar portion to form a core-coil in which the two coils are integrally fixed. In a coil in which a magnetic core is inserted inside a winding shaft of a core coil to form a magnetic path connecting two air core coil intermediate assemblies,
On the joint surface of the collar of one air-core coil intermediate assembly, a locking piece having an inner or outer portion extending in the outer peripheral direction is provided, and on the joint surface of the collar of the other air-core coil intermediate assembly. Is provided with a notch-shaped locking step portion having a size equal to that of the locking piece at a position corresponding to the locking piece, and when the locking piece is assembled to the locking step portion, A locking projection and a locking recess having a size capable of fitting with each other are provided in the center of the facing combination surfaces, and when the locking step portion and the locking piece are combined, they are provided on the respective combination surfaces. By combining the locking step and the locking piece so that the locking projection is press-fitted into the locking recess, the air core coil with the structure in which the two air core coil intermediate assemblies are integrally connected and fixed is used. It is a characteristic coil.

[0006]

According to the present invention, the bobbin and bobbin used for the intermediate assembly of the air-core coil that constitutes the coil are connected and fixed by the engagement recesses or engagement projections of the engagement pieces provided on the respective joint surfaces. By using the locking recesses or locking projections provided on one piece and combining the locking step and the locking piece at corresponding positions, the locking projections can be press-fitted into the locking recesses for connection and fixing. No need to use adhesive, intermediate work such as temporary fixing is also unnecessary, connection fixing time can be shortened, and deterioration of working environment due to adhesive can be prevented. No worries, so in a better environment,
We can supply reliable and inexpensive products.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view of a coil according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing an enlarged joint portion of the embodiment shown in FIG. 1, and FIG. 3 is another embodiment of the present invention. 3 is a partial cross-sectional view showing a cross section at the joint portion of the collar portion of the bobbin of FIG.
FIG. 3A shows an example in which the locking projection has a wedge shape and the locking recess has a through hole.
3B shows an example in which the locking projections are hemispherical, and the locking recesses are through holes, FIG. 3C shows an example in which the locking projections are pyramidal, and the locking recesses are blind holes, and FIG. 3D is the locking. This is an example in which the protrusion is provided on the combined surface side of the locking step portion processed on the inner side portion of the flange, and the locking recess is processed on the locking piece in which the inner side of the flange extends. FIG. 6 is an exploded perspective view showing, in an enlarged scale, a joint portion of a collar portion of a bobbin in another embodiment of the present invention. The embodiment of the present invention is an air-core coil intermediate assembly in which windings 8 are applied to bobbins 1 and 2 having square tubular flanges 5 and 6 at both ends of a rectangular cylindrical winding shaft 15 shown in FIG. 3,4
An example of a coil assembled by using an air-core coil having substantially the same shape as that of the conventional air-core coil 7 in which two pieces are joined will be described.

In the coil of the first embodiment of the present invention, as shown in FIGS. 1 and 4, the size of the flanges 5 and 6 is about 18 mm × 20 mm and the thickness is 3 mm. The outer diameter of the shaft 15 is 6
An air-core coil is manufactured by joining two air-core coil intermediate assemblies 3 and 4 wound on bobbins 1 and 2 having a length of 8 mm and a length of 20 mm, and a magnetic core 10 is mounted on the coil. It was assembled. The bobbins 1 and 2 are formed of an insulating resin. As shown in FIG. 1 and FIG. 2, rectangular engaging pieces 17 are provided at two places on the upper side and the lower side of the joint surface 21 of the collar 6 on both sides of one bobbin, and are half of the joint surface 21 of the collar 6 of the bobbin. Of the thickness of the tongue piece extending from the joining surface 21 in the outer peripheral direction by a predetermined length, and at a position corresponding to the locking piece 17 of the joining surface 21 of the collar 5 on both sides of the other bobbin. A notch-shaped engaging step portion 22 (see FIG. 2) having a thickness half that of the engaging portion 21 and into which the engaging piece 17 is fitted is provided. A triangular prism-shaped locking projection 14 is provided at the center of the combination surface 26 of the locking step portion 22. The locking piece 17 of the collar 6 of the other bobbin is provided with a through hole-shaped locking recess 13 at a position corresponding to the locking projection 14 when fitted. FIG. 2 is an exploded perspective view showing the vicinity of the locking piece 17 and the locking step portion 22 in an enlarged manner. In FIG. 1, when assembling the air-core coil 7, the joining surfaces 21 of the collars 5 and 6 of the two air-core coil intermediate assemblies 3 and 4 are faced to each other, and the locking piece 17 is fitted into the locking step portion 22. At this time, due to the elasticity of this portion, the locking piece 17
The protrusion 14 of the locking step portion 22 was pushed into the concave portion 13 of the above, and the two air-core coil intermediate assemblies 3 and 4 were integrally connected and fixed to produce the air-core coil 7. The magnetic core 10 was inserted and fixed in the hollow portion of the winding shaft 15 of the air-core coil 7 to complete the coil. As a result, the bobbin assembly time and man-hours can be reduced to about 10% compared to the bobbin bonding process of the conventional structure, and the workability is good and the operation is simple, so assembly by an automatic machine is also possible. A product with less variation in characteristics was obtained and the working environment could be maintained in a good state.

As described above, referring to FIGS. 1 and 2, the air-core coil in which the winding 8 is formed on the bobbins 1 and 2 having the square plate-shaped collars 5 and 6 at both ends of the rectangular cylindrical winding shaft 15, respectively. An example using the air-core coil 7 in which the intermediate assemblies 3 and 4 are integrally connected and fixed has been described, but a cylindrical winding shaft, or a disk-shaped brim as long as the joint surface is processed, can be used in the present invention. The effect is obtained. Also,
The position where the locking piece and the locking step portion are provided is the same as the example in which the locking piece 17 and the locking step portion 22 are provided inside the collar 6 in FIG. 3D.
It may be inside or outside of the tsuba, and as shown in FIG.
As shown in (b), FIG. 3 (c), and FIG. 3 (d), the shapes of the locking recess 13 and the locking projection 14 are concave as long as the projection can be inserted even if the recess 13 is not a through hole. The groove 18 or the recess 18 such as a blind hole may be used, and the locking projection 14 and the projections 19 and 20 having a hemispherical shape or a pyramid shape can achieve the same effect as that of the embodiment. Furthermore, in the present embodiment, an example in which the locking step portions 22 and the locking pieces 17 are provided at the upper and lower ends of the collars 5, 6 has been described, but not the part of the joint surface 21 of the collars 5, 6 but the entire width of the joint surface 21. Even if the locking step portion 22 and the locking piece 17 are provided over the same, the effect of the present invention does not change.

Further, FIG. 6 shows another embodiment of the present invention.
As shown in FIG. 3, one side (inside in this example) of the joining surface 21 of the collar 5 of the bobbin of the one air-core coil intermediate assembly 3 in the thickness direction is extended in the outer peripheral direction to form the locking piece 17. The other side in the thickness direction is processed into a notch-shaped locking step portion 22, and the joining surface 2 of the collar 6 of the bobbin of the other air-core coil intermediate assembly 4 is processed.
1 is provided with a locking step portion 22 and a locking piece 17 of a size that allows the locking piece 17 and the locking step portion 22 of the air-core coil intermediate assembly to be fitted to each other. The locking projection and the locking recess are provided together at the same position on the mating surface of the collar. In this example, the same effect as the above example was obtained.

Further, according to the present invention, since there is no concern that the adhesive will accumulate on the mounting surface of the air-core coil, as shown in FIG. 6, a part of the pin terminal 9 is pulled out to the side of the air-core coil. ,
By terminating the winding 8 or the like on this, it is only necessary to move the barbed portion 24 of the winding on the mounting surface side to another place such as a lateral side.
The standoff of the bobbin can be omitted, and a thin coil can be provided.

[0012]

As described above, according to the present invention,
It is possible to provide an air-core coil with good assembly workability, and an inexpensive coil with stable characteristics can be provided.

[Brief description of drawings]

FIG. 1 is an external perspective view of a coil according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing an enlarged joint portion of the embodiment shown in FIG.

FIG. 3 is a partial cross-sectional view showing a cross section at a joint portion of a collar portion of a bobbin according to another embodiment of the present invention. FIG. 3 (a) shows an example in which the locking projection is wedge-shaped and the locking recess is a through hole. FIG. 3B shows an example in which the locking projections are hemispherical and the locking recesses are through holes. FIG. 3C shows an example in which the locking projections are pyramidal and the locking recesses are blind holes. The figure which shows the example which processed the locking piece and the locking recessed part on the winding shaft side which is the inside of a collar.

FIG. 4 is an external perspective view of a conventional coil formed by adhering two air core coil intermediate assemblies.

5 is a cross-sectional view showing a cross section at a central portion of a bobbin collar portion, which shows a swelling of an adhesive to a joint surface when the coil shown in FIG. 4 is assembled by a conventional method.

FIG. 6 is an exploded perspective view showing a joint portion of a collar portion of a bobbin in an enlarged manner in another embodiment of the present invention.

[Explanation of symbols]

 1, 2 bobbins 3, 4 (air core coil) intermediate assembly 5, 6 collar 7 air core coil 8 winding 9 pin terminal 10 magnetic core 11, 21 joint surface 12 standoff 13, 18 (locking) recess 14, 19, 20 (Locking) protrusion 15 Rolling shaft 16 Adhesive 17 Locking piece 22 (Locking) step 23 Magnetic core through hole 24 Barb 25, 26 Combination surface

Claims (1)

[Claims] 1. An air-core coil intermediate assembly is formed by winding a winding wire on a bobbin having a collar made of an insulating material attached to both ends of a hollow winding shaft made of an insulating material to form an air-core coil intermediate assembly. Two coil intermediate assemblies are joined to the joint surfaces on the lateral sides of the respective collars to join the joint surfaces to form an air-core coil in which the two coils are integrally fixed, and the air-core coil is wound. In a coil in which a magnetic core is inserted inside the shaft to form a magnetic path that connects two air-core coil intermediate assemblies, one of the air-core coil intermediate assemblies has a joint surface of the collar or the inside thereof. A locking piece having an outer portion extending in the outer peripheral direction is provided, and the size of the locking piece is provided at a position corresponding to the locking piece on the joint surface of the collar of the other air-core coil intermediate assembly. Is provided with a notch-shaped locking step portion having a size equal to that of the An engaging protrusion and an engaging recess having a size that allows them to be fitted to each other are provided in the center of the facing combining surfaces, and when the engaging step portion and the engaging piece are combined, the engaging portions provided on the respective combining surfaces. Features an air core coil with a structure in which two air core coil intermediate assemblies are integrally connected and fixed by combining a locking step portion and a locking piece so that the locking projection is press-fitted into the stop recess. And a coil.