JPH06290947A - Inductance element - Google Patents

Abstract

PURPOSE:To provide an inductance element having a longitudinal groove large enough for pouring casting agent and air ventilation, which can be taped with a small spacing. CONSTITUTION:A wound core 3 where a wire is wound and which is provided with flanges 2 is housed in an outer case 25, and casting agent 24 is poured into the outer case 25 to seal up the wound core 3, wherein the external shape of the outer case 25 is like a square pole, the opening outer edge 26 of the outer case 25 is nearly square, a longitudinal groove 29 as an air vent is provided to the opening inner face of the outer case 25 adjacent to each of the four corners 27 of the outer edge 26 in parallel with a housing direction (direction of arrow). Moreover, the wound core 3 is so arranged inside the outer case 25 as to enable a line connected between the roots of two radial lead terminals 11 of the wound core 3 which extend from the opening of the outer case 25 to form an angle of 45 deg. or so with a line connected between the center of the opening and the longitudinal groove 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductance element, and more particularly to a structure of a radial lead type inductance element having a winding core housed in an outer case.

[0002]

2. Description of the Related Art An inductance element is a choke coil,
These electronic components are widely used in various circuits such as filter elements and peaking coils.Currently, automatic insertion is progressing in surface mounting, and it is common to package small radial lead type inductance elements with taping specifications that also support automatic insertion. Has become.

In the structure of the radial lead type inductance element, for example, when an outer case molded of resin or the like is used, the winding core wound with a winding is sealed in the outer case. The thermosetting resin was injected into the outer case as a casting agent.

FIG. 5 is a perspective view showing a state in which the winding core of the conventional inductance element is housed in an outer case.

In the conventional inductance element 1 described above, the outer shape of the outer case 5 is cylindrical in conformity with the shape of the winding core 3 having the circular collar 2, and the winding core 3 is slightly formed in the opening surface 6. Storage port 7 that can be stored with enough room
Is provided on the inner side surface of the storage port 7, and a vertical groove 9 for venting air is provided so that air or the like can easily escape when the casting agent is injected.

A winding wire 14 soldered to the bases of two parallel radial lead terminals 11 protruding from the circular collar 2 is provided.
Normally, a crossover groove 12 is provided at the position where the wire is wired on the side surface of the circular collar 2.
At the time of housing, the winding core 3 was housed so that the crossover groove 12 portion was aligned with the position of the air venting vertical groove 9 of the exterior case 5, and the casting agent was injected. By covering and matching the crossover groove 12 portion with the position of the air venting vertical groove 9 of the outer case 5, the vertical groove portion is made as small as possible to suppress the outer diameter of the outer case 5, and is aligned with the crossover groove portion. This is to ensure a sufficient gap as a casting agent spout and an air vent hole.

[0007]

However, in the conventional inductance element 1, since the outer case 5 has a cylindrical outer shape in accordance with the shape of the winding core 3 having the circular flange 2, the outer case is inevitable. When the air venting vertical groove 9 is provided on the inner surface of the case, the thickness d of the outer case must be increased by the depth of the groove as compared with the state without the groove because it is necessary to secure a predetermined thickness and maintain strength.

As a result, there has been a problem that the outer dimension y of the inductance element 1 as a product becomes large and the product pitch at the time of taping becomes large.

Even in the case of the stick packing method, the number of products per unit length is small, resulting in poor packing efficiency.

On the other hand, the external dimension y of the inductance element 1
In order to make as small as possible, it is common to design the clearance between the core outer diameter and the case inner diameter to be small.
Therefore, a new problem has arisen in the method of injecting the casting agent.

For example, in the above process, since the casting agent does not easily penetrate into the inside, it is necessary to inject the casting agent in small amounts in several times. Further, the method of injecting the casting agent into the outer case in advance also causes a problem that the casting agent overflows when the winding core 3 is inserted into the outer case 5.

On the other hand, if the outer diameter x of the core is too small, a large gap is generated between the inner diameter z of the outer case and the accuracy of the position of the core in the case is difficult to obtain.

The present invention has been made in view of the above circumstances, and it is possible to narrow the pitch between products at the time of taping while ensuring a vertical groove of a sufficient size for injecting a casting agent and bleeding air, thereby improving packing efficiency. The present invention provides a good inductance element.

[0014]

According to the present invention, a winding core having a circular collar around which a winding is wound is housed in an outer case, and a casting agent is injected into the outer case to form the winding core. In the sealed and fixed inductance element, the outer shape of the outer case is a quadrangular prism whose outer edge of the opening surface is substantially square, and a vertical groove for venting air is formed at a position on the inner side surface of the opening that is close to a corner of the outer case. By providing an inductance element characterized by being provided in parallel with the housing direction, a line connecting the roots of the two radial lead terminals of the winding core projecting from the opening of the outer case is opened. To provide an inductance element characterized in that a winding core is arranged in an outer case so as to be positioned at an angle of about 45 ° with respect to a straight line connecting a plane center and the air venting vertical groove. Ri is intended to achieve the above object.

[0015]

In the inductance element according to the present invention, the outer shape of the outer case for accommodating the winding core having the circular brim is formed into a square pole shape, so that air is injected when the casting agent is injected into the inner surface of the outer case. It is possible to dispose an air venting groove having a size large enough to serve as an escape path for the air so that the air will not be mixed with each other to form a nest without increasing the thickness of the outer case at the corner portion.

Further, the direction in which the taped inductance elements are arranged, that is, the line connecting the roots of the two radial lead terminals of the winding core is about 45 with respect to the straight line connecting the center of the outer surface of the outer case and the air venting vertical groove. Since the inductors are arranged so as to be at a position of .degree., The adjacent side surfaces of the outer case of each inductance element are perpendicular to the direction in which the products are arranged, so that the taping can be performed densely.

[0017]

Embodiments of an inductance element according to the present invention will be described in detail with reference to the drawings. The same reference numerals are used for the members having the same shapes as those of the above-mentioned conventional example.

FIG. 1 is a perspective view showing a state in which a winding core in an inductance element according to the present invention is housed in an outer case from above, and FIG. 2 shows a state of the outer case and the winding core housed in the case. It is a top view compared with the prior art example. FIG. 3 is a perspective view showing a state in which a plurality of inductance elements according to the present invention are taped.
FIG. 6 is a perspective view showing another embodiment according to the present invention.

First, in FIG. 1, the inductance element 2
In No. 0, the winding core 3 having the circular brim 2 around which the winding is wound is housed in the outer case 25, and the casting agent 24 is injected into the outer case 25 to seal and fix the winding core 3. In the structure, the outer shape of the outer case 25 is formed into a quadrangular prism shape with the opening surface outer edge 26 being a substantially square shape, and for air bleeding at a position on the inner side surface of the opening near the four corners 27 of the outer case 26. The vertical groove 29 is stored in the direction (arrow direction)
It is characterized in that it is provided in parallel with.

Further, as shown in FIG. 2, the inductance element 20 includes the winding core 3 and the outer case 2 which are housed therein.
Regarding the positional relationship with 5, the straight line r connecting the roots of the two radial lead terminals 11 of the winding core projecting from the opening of the outer case 25 is the straight line connecting the center of the opening surface to the air venting vertical groove 29. The winding core 3 is arranged in the outer case 25 so as to be positioned at an angle α of about 45 ° with respect to m.

The main members of the inductance element 20 will be outlined below.

The main body of the winding core 3 is formed by sintering ferrite or other magnetic material, and the radial lead terminal 11 is planted in one circular flange 2. This winding core 3
A winding 14 of an insulating coated wire is wound between the circular collars, and both ends of the winding are soldered to the two radial lead terminals 11 via the crossover groove 12.

The material of the outer case 25 is synthetic resin or metal, for example, polyethylene terephthalate (PE
T) and polybutylene terephthalate (PBT) are injection-molded, and in addition, there is also a product obtained by plating the outer surface with a metal such as copper or tin for the purpose of preventing noise.
There is also an outer case made of a metal such as aluminum or copper, the outer surface of which is coated with a resin if necessary.

The casting agent 24 is a thermosetting resin such as an epoxy resin, a phenol resin or a silicone resin, which is injected into the outer case 25 and then heat-cured to seal and fix the winding core 3 inside. To do.

Next, referring to FIG. 2, comparing the inductance element 20 having the above-described structure with the conventional inductance element 1, the outer case 5 for accommodating the winding core 3 having the same size.
And 25 have a length of 2w shorter in the direction of the straight line r.

Therefore, as shown in FIG. 3, the mount tape 36
Also, when the radial lead terminals 11 of the respective inductance elements 20 arranged in a line with the adhesive tape 37 are taped, the pitch t between the inductance elements should be narrower than the pitch of the conventional taping inductance element 1 by a pitch difference of 2w. You can

It is obvious that the pitch difference 2w becomes longer as the inductance element 20 becomes larger, and it goes without saying that the pitch t becomes narrower.

Therefore, it is obvious that the packing efficiency when the inductance element 20 is taped and packed is improved.

The inductance element according to the present invention is not limited to the inductance element 20.
For example, as shown in FIG. 4 (A), the air venting vertical groove 39 may have a semi-cylindrical shape, and four air venting vertical grooves 29 of the inductance element 20 are provided. As shown in (B), even if only two are provided, there is no problem as long as the effect of venting air at the time of injecting the casting agent is sufficiently exhibited. Further, as shown in (C), the opening surface is such that a pair of corners of the outer edge of the opening surface of the outer case is provided with not only chamfered rounded corners but also large rounded corners 30 having the same size as the circular brim of the winding core. Of course, even the outer edge shape is included in the range of the substantially square according to the present invention.

As described above, the air venting vertical grooves in the present invention are characterized by their positional relationship in combination with the outer shape of the outer case, and the number and shape of the air venting vertical grooves are not particularly limited.

[0031]

The inductance element according to the present invention is
Since the housing case and the winding core having the above-described structure have a storage positional relationship, it is possible to smoothly inject the casting agent and improve the packing efficiency by narrowing the taping pitch of the radial lead terminals. Has excellent effect.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a winding core of an inductance element according to the present invention is housed in an outer case from above.

FIG. 2 is a plan view showing a state of an outer case and a winding core housed in the case in comparison with a conventional example.

FIG. 3 is a perspective view showing a state in which a plurality of inductance elements according to the present invention are taped.

FIG. 4 is a perspective view showing another embodiment of the present invention, in which (A) is an outer case having a semi-cylindrical air venting vertical groove, and (B) is a concave air venting vertical groove. In the case of an outer case having only two, (C) is an outer case in which a pair of corners on the outer edge of the opening surface of the outer case are provided with a radius as large as the circular brim of the winding core.

FIG. 5 is a perspective view showing a state in which a winding core of a conventional inductance element is housed in an outer case.

[Explanation of Codes] 1, 20 Inductance element 2 Circular collar 3 Winding core 5, 25 Outer case 6 Opening surface 7 Storage port 9, 29, 39 Air venting vertical groove 11 Radial lead terminal 12 Crossover groove 14 Winding X Outside core Diameter Y Outer dimension Z Outer case inner diameter 20 Inductance element 24 Casting agent 26 Opening surface outer edge 27 Corner portion 30 R 36 Mount tape 37 Adhesive tape t Pitch between inductance elements 2w Length difference in the direction of straight line (= pitch difference) α angle

Claims (2)

[Claims] 1. An inductance element in which a winding core having a circular flange around which a winding is wound is housed in an outer case and a casting agent is injected into the outer case to seal and fix the winding core. The outer shape of the outer case is a quadrangular prism whose outer edge of the opening surface is substantially square, and the air venting vertical groove is arranged parallel to the storage direction at a position of the inner surface of the opening near the corner of the outer edge of the outer surface of the outer case. An inductance element characterized by being provided. 2. A line connecting the roots of two radial lead terminals of the winding core protruding from the opening of the outer case is about 45 ° with respect to a straight line connecting the center of the opening surface and the air venting vertical groove. The inductance element according to claim 1, wherein the winding core is arranged in the outer case so as to be positioned at the angle.