JPH10321446A - Choke coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a choke coil of a structure in which no substrate for holding a drum core is required and a gap between a ring core and the drum core is extremely made small. SOLUTION: This choke coil is provided with a ring core 60 containing a cylindrical space 61, an irregular-collar-type drum core 70, in which a collar part 71 of a diameter larger than the cylindrical space 61 of the ring core 60 and a collar part 72 of a diameter smaller that it are connected with a wire-winding axis part 73 and only the collar part 72 of small diameter and the axis part 73 are housed in the cylindrical space 61 remaining the collar part 71 of large diameter, a strip wire 80, which is multiplex-wound around the drum core 70 to be housed in the cylindrical space 61 of the ring core 60 and has a width fitted to the length of the axis of the drum core 70, and a terminal plate 90 which is directly fixed to the outer periphery of the ring core 60 and to which a wire led out from the gap between the ring core 60 and the collar part 71 of large diameter is connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a choke coil having a structure in which a drum core around which a wire is wound is mounted on a ring core.

[0002]

2. Description of the Related Art A choke coil having a structure as shown in FIGS. 4 and 5 is conventionally known as a choke coil in which a drum core wound with a wire is mounted in a ring core. In these figures, reference numeral 10 denotes a ring core having a cylindrical space 11;
Is an equal brim type drum core in which the upper and lower brim portions 21 and 22 having a smaller diameter than the cylindrical space 11 of the ring core 10 are connected by a shaft portion 23 for winding a wire; Reference numeral 11 denotes a round wire accommodated in the terminal 11, reference numeral 40 denotes a terminal mounting board, and reference numeral 50 denotes a terminal plate.

[0005] The substrate 40 has terminals 41, 41 for winding and connecting both ends of the wire 30, respectively, and protruding outside. These terminals 41, 41 and external terminal plates 50, 5
0 is separately connected. The upper and lower flange portions 21 and 22 of the drum core 20 have the same diameter, and both are housed in the cylindrical space 11 of the ring core 10.

[0004] In the above-mentioned equal brim type drum core 20, a necessary gap (clearance) G1 is provided between the inner wall of the ring core 10 and the peripheral edge of the upper brim portion 21. Since the outer diameter of the round wire 30 in which the round wire 30 is aligned and wound varies, this gap is usually G1 = 0.4 m in consideration of the ease of drum core insertion.
m.

[0005]

The smaller the gap G1 is, the larger the inductance component becomes, which is preferable as a magnetic circuit. However, as in the conventional case, the inductance component is extremely reduced in a large order of G1 = 0.4 mm. This is the first problem to be solved by the present invention.

In the conventional structure, in order to hold the drum core 20 in the ring core 10, a substrate 40 for closing the bottom surface of the ring core 10 is required. For this reason, the number of parts is large, and manufacturing costs and man-hours cannot be reduced. Further, in miniaturization, the height of the cores 10 and 20 is limited by the thickness of the substrate 40, so that the efficiency in magnetic characteristics cannot be improved. This is the second problem to be solved by the present invention.

SUMMARY OF THE INVENTION An object of the present invention is to provide a choke coil which does not require a substrate for holding a drum core and has a structure in which a gap between a ring core and a drum core can be extremely reduced.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for winding a wire between a ring core having a cylindrical space and a flange having a larger diameter and a smaller diameter than the cylindrical space of the ring core. An unequal flange type drum core that accommodates only the small diameter flange portion and the shaft portion in the cylindrical space while leaving the large diameter flange portion, and the ring core that is wrapped around the drum core multiple times. A band-shaped wire accommodated in a cylindrical space, having a width corresponding to the axial length of the drum core, and the wire fixed directly to the outer periphery of the ring core and pulled out from a gap between the ring core and the large-diameter flange portion. And a terminal plate to which a wire is connected.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments shown in the drawings. 1 to 3 are configuration diagrams showing an embodiment of the present invention. FIG. 1 is an assembled perspective view, FIG.
FIG. 3A is a longitudinal sectional view in an assembled state, and FIGS. 3A, 3B, and 3C are a top view, a side view, and a bottom view in an assembled state, respectively.

In these figures, reference numeral 60 denotes a rectangular ring core having a cylindrical space 61, and reference numeral 70 denotes a flange 71 having a larger diameter than the cylindrical space 61 of the ring core 60 and a flange 7 having a smaller diameter than the cylindrical space 61.
2 is connected by a shaft portion 73 for winding a wire, and a non-uniform flange type drum core, in which only the small diameter flange portion 72 and the shaft portion 73 are accommodated in the cylindrical space 61 while leaving the large diameter flange portion 71, 80. Is a band-shaped wire having a width corresponding to the axial length of the drum core 70, which is wound multiple times around the drum core 70 and accommodated in the cylindrical space 61 of the ring core 60, 90 is directly fixed to the outer periphery of the ring core 60, These are terminal plates to which the wires 80 drawn out from the gaps between the flange portions 71 are connected, and these constitute the choke coil of the present invention.

On the upper surface of the two opposing corners of the ring coil 60, a slight recess 62 through which the band-shaped wire 80 passes is provided.
Is formed. The terminal board 90 is attached outside this corner. The terminal plate 90 is attached by caulking the bottom surface of the ring core 60. Both ends of the strip-shaped wire 80 are pulled upward from the drum core 70, and are
Go outside through 2 The end of the strip-shaped wire 80 that has come out is connected to the terminal plate 90 by soldering or the like. The upper end surface of the ring core 60 and the large-diameter flange portion 71 facing the upper surface are bonded with a non-conductive and non-magnetic adhesive.

As is apparent from the sectional view of FIG. 2, the drum core 70 is supported by the ring core 60, so that the conventional substrate (40 in FIG. 5) is not required. For this reason, the number of parts is reduced, and the manufacturing cost and man-hour can be reduced. Also,
When miniaturizing, there is no thickness of the substrate.
The heights of 0 and 70 can be increased, and the efficiency in magnetic properties can be improved. Further, with the omission of the substrate, the terminal (41 in FIG. 4) projecting outside is eliminated, which is advantageous for miniaturization.

The gap on the magnetic circuit between the ring core 60 and the drum core 70 is G2 shown in FIG. The gap G2 is a small value that is limited only by the thickness of the adhesive interposed between the two or the thickness of the strip-shaped wire 80 passing through the concave portion 62. Actually, a small value of about 1/10 of the conventional value of G2 = 0.04 mm can be realized, and the value of the inductance can be increased.

The belt-shaped wire 80 can be mounted on the drum core 70 at a high density by being wound multiple times. The DC resistance value of the strip-shaped wire 80 is smaller than a normal round wire. Therefore, the choke coil according to the present invention can realize a magnetic circuit having a large inductance and a small DC resistance and good magnetic properties.

If a round wire is used instead of the strip wire 80, the inductance can be changed over a wide range, and the degree of freedom in design is increased. The above-mentioned adhesive is also a means for controlling the value of the gap G2. further,
The gap G3 in FIG. 3B is a relief portion used to pull out the wire 80.

[0016]

As described above, according to the present invention, it is possible to provide a choke coil having a structure that does not require a substrate for holding a drum core and that can extremely reduce the gap between the ring core and the drum core.

[Brief description of the drawings]

FIG. 1 is an assembled perspective view showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 3 is a three-side view showing one embodiment of the present invention.

FIG. 4 is a configuration diagram showing a conventional choke coil.

FIG. 5 is a sectional view showing a conventional choke coil.

[Explanation of symbols]

 Reference Signs List 60 ring core 61 cylindrical space 62 concave portion 70 uneven flange type drum core 71 large-diameter flange portion 72 small-diameter flange portion 73 shaft portion 80 strip-shaped wire 90 terminal plate

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01F 17/04 H01F 15/10 F

Claims (2)

[Claims] 1. A ring core having a cylindrical space, and a flange portion having a larger diameter and a smaller diameter portion than the cylindrical space of the ring core are connected by a shaft portion for winding a wire, and the ring core has a large diameter. An unequal collar-type drum core for accommodating only the small-diameter collar portion and the shaft portion in the columnar space while leaving the collar portion, and the drum core of the drum core, which is wound multiple times around the drum core and accommodated in the columnar space of the ring core. A strip-shaped wire having a width corresponding to an axial length, and a terminal plate directly fixed to an outer periphery of the ring core and connected to the wire drawn out of a gap between the ring core and the large-diameter flange portion. A choke coil characterized in that: 2. The choke coil according to claim 1, wherein a gap between the end face of the ring core and the large-diameter flange facing the ring core is bonded with a non-conductive and non-magnetic adhesive. .