JP3598161B2 - choke coil - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a structure of a choke coil used for a glass antenna or the like used for improving the receiving sensitivity of a vehicle-mounted radio or the like.
[0002]
[Prior art]
FIG. 3 is a perspective view showing a conventional choke coil used for a glass antenna or the like. As shown in FIG. 3A, a conventional choke coil used for a glass antenna or the like includes an insulating plate-shaped fixing base 15, a coil 12 attached to one surface of the fixing base 15, and the coil. It comprises a metal terminal 13 disposed on the surface on which the coil is mounted, and a metal base 14 disposed on the surface opposite to the surface on which the coil is mounted.
[0003]
The fixing base 15 is provided with a projection 15a at one end of a plate-like body, forms a step, and is substantially L-shaped.
[0004]
The metal terminal 13 has a flat plate shape, the tip of the terminal portion is formed like an arrowhead, extends outward from the top of the protrusion 15a of the fixing base 15, and is fixed substantially at the center on the protrusion 15a, It is fixed to the step 15b in the long axis direction and extends from the end of the fixed base 15 where the projection 15a is not provided to the coil 12 arranged in the long axis direction, and the flat portion 15d of the metal terminal is provided. The lead terminal 15c of the coil 12 is to be soldered.
[0005]
The metal base 14 having a plate-like shape and having attachment portions formed at both ends is adhered and fixed with an adhesive or the like to the surface of the fixing base 15 opposite to the surface on which the metal terminals 13 are provided. The mounting portions are provided to protrude outward from both ends of the fixed base 15.
[0006]
Both ends of the coil 12 are directly soldered 9 to the flat portion 15d of the metal terminal 13 and the flat portion 15e of the metal base 14. The metal terminal 13 and the metal base 14 are soldered together with the coil 12 using a heat-shrinkable tube (not shown) or the like, and then fixed to a resin-made fixing table 15 or FIG. As shown in (1), a metal terminal 17 and a metal base 18 are integrally formed on the fixed base 16.
[0007]
[Problems to be solved by the invention]
A conventional structure in which a metal terminal and a metal base to which a coil is connected and a metal base are fixed to a fixing base with a heat-shrinkable tube or the like lacks reliability and has a problem that quality is not stable.
[0008]
In addition, the structure in which the fixing base, the metal terminal, and the metal base are integrally molded has a problem that the terminal structure is complicated, the mold is complicated, expensive, and unsuitable for mass production. there were. In either structure, the metal terminal and the flat part of the metal base are connected by soldering, and in a short-time soldering operation, there is no problem in appearance, but when the soldering operation time is long, the The fixing base is melted or deformed, and similarly, the solder position of the flat part of the metal terminal and the metal base is deformed and peeled off, causing a problem in appearance.
[0009]
There is also a problem that the soldering position varies depending on the operator and is not constant.
[0010]
In order to eliminate these disadvantages, the present invention prevents deformation of the fixing base, the metal terminal, and the metal base during soldering work, and can easily fix the fixing base, the metal terminal, and the metal base. An object of the present invention is to provide a choke coil used in a glass antenna or the like having a structure that is not easily deformed and has a structure in which a soldering position is not varied by an operator.
[0011]
[Means for Solving the Problems]
According to the present invention, as an example, in a choke coil used for a glass antenna or the like, a fixed base provided with protrusions at both ends of one surface of a plate-shaped body, and a claw that is penetrated through one protrusion of the fixed base and turned back And a metal base formed by fitting a groove of the fixing base provided on a surface having no protrusion, forming a folded claw, and a folded portion having a stopper mechanism. Both ends are locked by the metal terminal and the claw of the metal base, and the fixed base portion, which is in contact with the back surface of the portion where the claw is formed, has a structure in which a concave portion is formed. The base, the metal terminals and the metal base can be easily fixed, the fixing base is not easily melted and deformed by soldering, and the soldering position is fixed.
[0012]
That is, the present invention comprises an insulating flat plate-shaped fixing base, a plate-shaped metal terminal having one end processed, a plate-shaped metal base provided with mounting portions at both ends, and a coil, The metal terminal and the metal base are disposed with the thickness of the metal terminal and the metal base therebetween, and the coil is electrically connected between the metal terminal and the metal base. The metal terminal, the metal base, and the coil are connected to the fixing base. In the fixed choke coil, a projection A for attaching the metal terminal to one of both ends of one surface of the fixed base, and a projection B for positioning the metal base on the other, A groove provided on a projection C for attaching a metal base is provided integrally near a position corresponding to the projection A, and the metal terminal having a claw for attaching one of an external connection terminal and a lead terminal of a coil is provided. Protrusion A, and the metal base having a folded portion for positioning with the protrusion B when attached to the fixing base and a claw for attaching the other of the lead terminals of the coil is fitted into the groove, and fixed. Wherein the coil is disposed so as to be located between the protrusion A and the protrusion B, and a recess is provided on the fixing base in the vicinity of the position where the nail of the metal terminal is located. Coil.
[0013]
Further, the present invention is the above-mentioned choke coil, wherein a recess is provided in the vicinity of the metal base of the fixing base where the claw is located.
[0014]
Further, the present invention is the choke coil described above, wherein a fixing base having a flat surface to which the metal base is attached is used.
[0015]
As described above, the choke coil used in the glass antenna and the like of the present invention includes a fixed base provided with the projections A and B at both ends of one surface of the plate-like body, and penetrates one of the projections A of the fixed base. A metal terminal having a folded claw, and a projection C having a groove provided on a surface having no projections A and B, and fitted into the groove to form a folded portion having a claw and a stopper mechanism. A portion of the fixed base, which is composed of a metal base and a coil, and both ends of the coil are fixed to the metal terminals and the claws of the metal base by solder or the like, and are in contact with the back surface of the portion where the claws are formed. Has a structure in which a concave portion is formed.
[0016]
With this structure, the metal terminal penetrates through the fixing base and is easily fixed with sufficient strength, and the metal base can be fitted and fixed in the groove of the protrusion C of the fixing base. . In addition, since the metal base is provided with a folded portion having a stopper mechanism, the folded portion is positioned and can be fitted until the folded portion and the fixed base come into contact with each other.
[0017]
The metal terminal and the metal base can be reliably electrically connected to the coil by engaging the lead terminals of the coil with their respective claws and then performing a soldering operation.
[0018]
Further, the fixing base, which is in contact with the back surface of the soldered portion where the metal terminal and the metal base claw are formed, is formed with a concave portion so that only a part of the surface is not in contact with the soldering work. Is hardly conducted to the fixing table, and melting or deformation due to the heat of the soldering operation can be prevented.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described using examples.
[0020]
FIG. 1 is an explanatory diagram of a choke coil according to a first embodiment of the present invention used for a glass antenna or the like. FIG. 1A is a perspective view, and FIG. 1B is a front view.
FIG. 2 is an explanatory diagram of a choke coil fixing base, a metal terminal, and a metal base according to a second embodiment of the present invention used for a glass antenna or the like. FIG. 2A is a perspective view, and FIG. 2B is a front view.
[0021]
As shown in FIG. 1, the choke coil used for the glass antenna and the like includes a fixing base 4, a metal terminal 5, a metal base 6, and the coil 3. The metal terminal 5 is made of a copper plate having a thickness of about 1 mm. The metal base 6 is made of a 0.8 mm thick copper plate.
[0022]
The fixing base 4 used in the choke coil of the present invention is made of polybutylene terephthalate (PBT) resin. The length in the major axis direction is about 30 mm, the width is about 10 mm, and the thickness is about 5 mm.
[0023]
The PBT is a material having good tracking properties (about 600 V), excellent heat resistance, and excellent moisture absorption, and is made with consideration given to the safety of the fixing table 4.
[0024]
The fixing base 4 is provided with a projection A4a for attaching the metal terminal 5 to one of the two longitudinal ends of one surface of the plate-like body, and a projection B4d for positioning the metal base 6 on the other. ing. Further, a groove 4g provided on the projection C4e for attaching the metal base 6 is formed integrally with the surface on which the projection A4a is provided and near the position corresponding to the projection A4a on the opposing surface. The protruding portion B4d is for positioning by a folded portion serving as a stopper of the metal base 6. That is, it functions to be fixed to the projection C such that the claw for attaching one of the lead terminals of the coil is located substantially at the center of the recess B4i of the metal base.
[0025]
The projection A4a has an external connection terminal located outside the fixing base, and a claw 7 for attaching the other of the lead terminals of the coil 3 located between the projection A4a and the projection B4d at both ends. Is provided with a through hole A4f for bonding and fixing the metal terminal 5 in the form of a flat plate.
[0026]
A recess A4b is formed in the vicinity of the back surface where the other lead terminal of the coil and the claws 7 of the metal terminal are located. Because of the concave portion A4b, heat dissipation due to soldering is improved, so that the metal terminal does not deform.
[0027]
An arrowhead portion 5a at one end of the metal terminal 5, that is, an external connection terminal, is mounted so as to be orthogonal to the substrate mounting portions 11a and 11b of the metal base 6. This is to make it easier to install the terminal on the mesa side of the semiconductor.
[0028]
Further, a concave portion B4i is provided in the vicinity of the back surface of the fixing base 4 where the claw of the metal base 6 is located, so that heat dissipation during soldering is improved, so that deformation of the metal base does not occur.
[0029]
The choke coil of the present invention is assembled as follows. First, the metal terminal 5 having the claw 7 is inserted into the through-hole A4f, and is installed and fixed so as to bridge the recess A4b and the step A4h. At this time, the nail 7 does not stand and passes through the through hole A4f. After the penetration, the nail is set up in an L shape. Next, the metal base 6 provided with the folded portion 10 and the claw 8 is inserted into the groove 4g of the projected portion C4e from the side provided with the projected portion B4d of the fixing base 4, so that the projected portion B4d and the folded portion 10 are connected. Glue and fix at the point of contact. The claw 8 is formed in an L-shape, and the metal base 6 is bent to form a mounting portion 11a facing the mounting portion 11b.
[0030]
Thereafter, lead terminals extending from both ends of a coil 3 in which a copper wire having a diameter of 1.6 mm is wound in a cylindrical shape on a cylindrical magnetic core 2 having a diameter of 4.0 mm of Ni—Zn ferrite and having nine turns are attached to claws 7. 8 is soldered 9 and fixed to complete a choke coil in which the coil, the metal terminal and the metal base are electrically connected.
[0031]
FIG. 2 shows a choke coil according to a second embodiment used for a glass antenna or the like. As can be seen from FIG. 2, the choke coil according to the second embodiment is different from the first embodiment in that the fixing base 4 is formed by filling the recess of the recess B4i with PBT. That is, the metal terminal 5 on which the claw 7 is formed is passed through the fixing base 4 made of polybutylene terephthalate (PBT), and the metal base 6 on which the claw 8 and the folded portion 10 having the stopper mechanism are formed is connected to the fixing base 4. And inserted into the groove 4g of the protrusion C4e until the folded portion 10 comes into contact with the end of the fixed base 4 and fixed, forming the mounting portions 11a and 11b, and the coil through which the magnetic core 2 is inserted. The lead terminal 3 is fixed to the claws 7 and 8 by applying solder 9 thereto. Then, the coil 3, the metal terminal 5, and the metal base 6 are electrically connected to complete the choke coil.
[0032]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, a fixing base, a metal terminal, and a metal base can be easily fixed, the positioning of a soldering operation can be facilitated, and the fixing base is used for a glass antenna or the like having a structure that does not melt or deform. A choke coil can be obtained.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a choke coil according to a first embodiment of the present invention used for a glass antenna and the like. 1A is a perspective view, and FIG. 1B is a front view.
FIG. 2 is an explanatory view showing a fixed base, a metal terminal, and a metal base of a choke coil according to a second embodiment of the present invention used for a glass antenna or the like. FIG. 2A is a perspective view, and FIG. 2B is a front view.
FIG. 3 is a perspective view showing a conventional choke coil used for a glass antenna or the like. FIG. 3A is a perspective view showing a structure using a heat-shrinkable tube, and FIG. 3B is a perspective view showing a structure formed integrally.
[Explanation of symbols]
1 Copper wire 2 Columnar magnetic cores 3, 12, 19 Coils 4, 15, 16 Fixing base 4a (made of resin) Projection A
4b recess A
4c Step B
4d protrusion B
4e Projection C
4f Through hole A
4g Groove 4h Step A
4i recess B
5, 13, 17 Metal terminals 5a Arrowheads 5b, 15d, 15e Flat portions 6, 14, 18 Metal bases 7, 8 Claws 9 Solder 10 Folding portions 11a, 11b Mounting portions 15a Projections 15b Steps 15c Lead terminals

Claims (3)

It is composed of an insulating plate-shaped fixing base, a plate-shaped metal terminal having one end processed, a plate-shaped metal base provided with attachment portions at both ends, and a coil, and sandwiching the thickness of the fixing base. A choke coil in which the metal terminal and the metal base are arranged, the coil is electrically connected between the metal terminal and the metal base, and the metal terminal, the metal base, and the coil are fixed to the fixing base; A protrusion A for attaching the metal terminal to one of both ends of one surface of the fixing base and a protrusion B for positioning the metal base on the other correspond to the protrusion A on the other surface. In the vicinity of the position, a groove provided on the projection C for attaching the metal base is integrally provided, and the metal terminal having a nail for attaching one of the external connection terminal and the lead terminal of the coil is fixed to the projection A. , The metal base having a folded portion for positioning with the protrusion B and a claw for attaching the other of the lead terminals of the coil when attached to the fixing base is fitted into the groove and fixed, and the coil is fixed. A choke coil, wherein the choke coil is arranged so as to be located between the protrusions A and B, and further provided with a concave portion in the vicinity of a position where a claw of a metal terminal is located on the fixing base. 2. The choke coil according to claim 1, wherein a recess is provided in a vicinity of the fixing base where the claw of the metal base is located. The choke coil according to claim 1, wherein a fixed base having a flat surface to which the metal base is attached is used.

Images