JPH07106142A - Toroidal coil - Google Patents

Abstract

PURPOSE:To obtain a small toroidal coil in which the terminal pin, provided on the base, is not bent when a case is engaged to the base and the case can be anchored completely. CONSTITUTION:The title toroidal coil is composed of a coil main body 1 on which a winding is wound on a toroidal core 4, a base 2 on which terminal pins 81 and 82 are planted, and a case 3. The base 2 has a pair of coil main body protecting walls 6 and 6 in the thickness direction of the toroidal core 4 of the mounted coil main body 1, and the case 3 covers the circumference of the coil main body 1 which is not covered by a pair of coil main body protecting walls 6 and 6, and it is interlocked by the base 2. When the case 3 is interlocked by covering the case 3 on the base 2 where the coil main body 1 is mounted, as the coil main body protecting walls 6 and 6 are retained, they can be retained sufficiently even when the base 2 is small in size, and the case 3 can be anchored completely to the base 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toroidal coil used as, for example, a common mode choke coil.

[0002]

2. Description of the Related Art As shown in FIG. 6, a coil body c in which a winding b is wound around a toroidal core a is fitted and fixed in a recess f of an insulating pace e in which a terminal pin d is planted. There is known a common mode choke coil in which a box-shaped case g is covered on a coil body c, a protrusion i is fitted in a recess h of a base e, and the base e is locked.

In the figure, j is a projection for releasing the gas generated when the coil is mounted on the wiring board and the terminal pins d are soldered to the wiring conductor from between the base e and the wiring board. It is provided at the bottom of both sides of e.

[0004]

In the above-described conventional common mode choke coil, since the base e has no holding portion when the case g is fitted to the base e, the terminal pin d must be held and fitted. I don't get it. Therefore, terminal pin d
Bends, causing a pitch shift of the terminal pins d, which is likely to cause trouble when mounted on the wiring board. In addition, there is a space below the concave portion h of the base e for holding the base e.
If the size is small, there is not enough space to hold the base e, so that the case g cannot be reliably fitted into the base e.

The present invention has been made in view of such inconveniences of the conventional toroidal coil, and can be formed in a small size without bending the terminal pins provided on the base when the case is locked to the base, and It is an object of the present invention to provide a toroidal coil that can be reliably locked.

[0006]

In order to achieve the above object, the present invention has a coil body in which a winding is wound around a toroidal core, and a terminal pin for connecting the end of the winding is implanted. The coil body comprises a base for mounting the toroidal core in an upright state and a case, and the base has a pair of coil body protecting walls in the thickness direction of the toroidal core of the coil body mounted on the mounting surface. The case has a feature that it covers the periphery of the coil body that is not covered by the pair of coil body protecting walls and is locked to the base.

[0007]

Since the pair of coil body protection walls facing each other is provided on the coil body mounting surface of the base, the coil body protection wall which is held here is not covered by the pair of coil body protection walls. Since the coil main body is covered with the case for covering and is locked to the base, the case can be sufficiently held even if the base is small, and the case is reliably locked to the base.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention applied to a common mode choke coil will be described below with reference to the drawings. 1 and 2 show a first embodiment of the present invention. In the figure, 1
Is a coil body, 2 is a synthetic resin base, and 3 is a synthetic resin case, for example. The coil body 1 is formed by winding two windings around a toroidal core 4 made of, for example, ferrite, and winding the winding 5.
Has a pair of coil body protecting walls 6 on both sides in the thickness direction of the toroidal core 4 of the coil body 1 on the coil body mounting surface, and a coil body mounting recess 7 at the center of the mounting surface. 2 pairs of terminal pins 8 on the surface opposite to the mounting surface
₁ , 8 ₁ , 8 ₂ and 8 ₂ are planted. The end of the winding 5 is connected to the terminal pin 8 ₁ through the grooves 9 on the side surface of the base 2,
8 _1, 8 _2, is soldered is tied to the ₈₂ of the root. The case 3 is U-shaped and has a pair of opposing plate pieces 10, 1
At the lower end of 0, there are locking claws 11, 11 that cover the coil body 1 with the coil 3 and lock the lower surface of the base 2, and the connecting plate piece 12 that connects the pair of facing plate pieces 10 and 10 is The stopper portion 13 is wider than the facing plate piece 10 and comes into contact with the top surface of the coil body protecting wall body 6 when the case 3 is locked to the base 2.
Have. In addition, the locking claw 11 uses the case 3 as a base 2
Since it projects from the lower surface of the base 3 when it is locked to the base 3, the common mode choke coil is mounted on the wiring board and the terminal pins 8 ₁ , 8 ₁ , 8 ₂ , 8 ₂ are passed through the holes of the wiring board, and the terminal pins 8 _{When 1} , 8, ₁ , 8 ₂ , and 8 ₂ are soldered to the conductive pattern of the wiring board, they also function to let the generated gas escape to the outside from the gap between the base and the wiring board. In the above embodiment, case 3
The connecting plate piece 12 is formed wider than the pair of opposing plate pieces 10 and 10, but may have the same width.

FIG. 3 shows a second embodiment of the present invention. In this embodiment, the pair of facing plate pieces 10 and 10 of the case 3 are shorter than those shown in FIGS. 1 and 2, and the locking claws 11 and 11 formed at the lower ends thereof are formed on the opposite side walls of the base 2. The case 3 is engaged with the recess 14 and is locked to the base 2. Protrusion 15 for gas escape during soldering
Are formed on the lower surface of the base 2.

FIG. 4 shows a third embodiment of the present invention. The case 3 of this embodiment is the same as that of the first embodiment, and the base 2 is provided with guide pieces 16 on each of the tapered sides of the pair of coil body protecting walls 6, 6. The point is different from the first and second embodiments. This guide piece 1
According to 6, the assembling work of the base 2 and the case 3 can be performed accurately and smoothly, and the strength against the pressing force to the side surface of the case 3 is improved.

FIG. 5 shows a fourth embodiment of the present invention.

The pair of coil body protecting walls 6, 6 of the base 2 of this embodiment does not cover the entire coil body 1, but has a height such that the base 2 can be pressed by hand. The wall body 6 for protecting the coil body is the coil body 1
Since the whole cannot be protected, the case 3 is composed of the box-shaped portion 17 and the leg plates 18, 18 that respectively hang down from the lower ends of the opposing side walls thereof. The end surfaces are configured to contact the top surfaces of the coil body protecting walls 6, 6 when the case 3 is locked to the base 2. The locking claws 11, 11 provided at the lower ends of the pair of leg plates 18, 18 of the case 3 engage with the lower surface of the base 2 and have a function of a protrusion for releasing gas during soldering.

[0013]

Since the inventions according to claims 1, 3 and 4 are configured as described above, the toroidal coil can be formed in a small size, and the terminal pin provided on the base when the case is locked to the base. It has an effect that it can be securely locked without bending.

Since the invention according to claim 2 is configured as described above, the gas generated when the terminal pins are soldered to the wiring board can escape from the gap between the base and the wiring board. It also has an effect.

[Brief description of drawings]

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

FIG. 2 is a perspective view of the above embodiment.

FIG. 3 is an exploded perspective view of a second embodiment of the present invention.

FIG. 4 is an exploded perspective view of a third embodiment of the present invention.

FIG. 5 is an exploded perspective view of a fourth embodiment of the present invention.

FIG. 6 is an exploded perspective view of a conventional toroidal coil.

[Explanation of symbols]

1 Coil Main Body 2 Base 3 Case 4 Toroidal Core 5 Winding 6 Coil Main Body Protecting Wall 81 ₁ , 8 ₂ Terminal Pin 10 Opposing Plate Piece 11 Engaging Claw 12 Connecting Plate Piece 13 Stopper 14 Recess 17 Box Box 18 Leg Plate

Claims (4)

[Claims] 1. A base body in which a coil body having a toroidal core wound with a winding wire and a terminal pin for connecting an end of the winding body are implanted, and the coil body is mounted in an upright state of the toroidal core, The base has a pair of coil body protecting walls in the thickness direction of the toroidal core of the coil body mounted on the mounting surface, and the case is a pair of coil body protecting walls. A toroidal coil, characterized in that it covers the circumference of an uncovered coil body and is locked to the base. 2. The toroidal coil according to claim 1, wherein an engaging portion of the case in a state of being engaged with the base protrudes from a lower surface of the base from which the terminal pin is drawn out. 3. The toroidal coil according to claim 1, wherein the pair of coil body protecting walls cover both surfaces of the coil body, and the case has a U-shape. 4. The pair of coil body protecting walls cover a part of both surfaces of the coil body, and the case includes a box-shaped portion and leg plates that hang down from lower ends of opposite side walls of the box-shaped portion. The toroidal coil according to claim 1, comprising: