JPH07335461A - Fly-back transformer - Google Patents

Abstract

PURPOSE:To provide a fly-back transformer of a constitution that the production cost of the transformer, the labor at the time of assembly of the transformer and the like are reduced and at the same time, the improvement of the reliability of the transformer can be easily contrived. CONSTITUTION:In a constitution formed by providing a fly-back transformer with one pair of cores 1, which are respectively formed into a U-shaped form when viewed from the side surfaces and are coupled with each other in a state that leg parts 1a (1b) oppose to each other, an anisotropic conductive gap spacer plate 20, which is continued to the leg parts 1a (1b) only along a direction in which these leg parts 1a (1b) oppose to each other, is interposed between the leg parts 1a (1b) on the sides on at least one side of the sides of the cores 1. The plate 20 is one of a constitution that it has a prescribed thickness after being formed using an insulative material and a conductive material, which is continued to the leg parts 1a (1b) only along the direction in which the leg parts 1a (1b) oppose to each other, is buried in it, and is formed as an anisotropic conductive rubber sheet or an anisotropic conductive polymer sheet having a prescribed thickness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flyback transformer (hereinafter referred to as "FBT"), and more particularly to a structure for electrically connecting cores.

[0002]

2. Description of the Related Art Conventionally, an FBT has been known to serve as a horizontal deflection output transformer by supplying a high DC voltage to the anode of a cathode ray tube of a television receiver or the like. That is, this FBT is shown in FIGS.
, A pair of ferrite cores 1 each having a U-shape in a side view and arranged to face each other, and a leg portion 1a on one side are exposed to the outside
b is inserted together with the low-voltage coil section 2 on the primary side, and the high-voltage coil section 3 on the secondary side externally fitted to the low-voltage coil section 2.
And a case 4 which surrounds the outer periphery of the high-voltage coil unit 3 and is filled with an insulating resin (not shown). The case 4 has a high-voltage rectifying diode, a capacitor, and a resistor. Required parts (not shown) such as are arranged. Incidentally, reference numeral 5 in FIG.
Shows a focus pack assembled on the outer surface of the case 4 forming the FBT.

[0003] And, these cores 1, each leg 1
a and 1b are bonded together by using an insulating adhesive 7 after interposing a gap spacer plate 6 having a predetermined thickness, and the leg portions 1a exposed to the outside of the case 4 are U-shaped in a side view. The metal springs 8 are sandwiched and connected as a unit. The gap spacer plate 6 here is made of an insulating resin or the like, and is interposed to prevent magnetic saturation. The spring 8 also has a function of electrically connecting the lower-side core 1 and the upper-side core 1 which are grounded to each other.

On the other hand, the low-voltage coil portion 2 constituting this FBT is constructed by winding a conductor wire 10 such as an enamel copper wire around a cylindrical bobbin 9 made of an insulating resin in a section form. Conductor wire 1 wound around each of the section collars formed on the outer surface of the bobbin 9.
The respective terminals 0 are connected to the respective terminal pins 11 projecting from the flange portion 9a of the tubular bobbin 9.
Further, the high-voltage coil portion 3 is configured by winding a conducting wire 13 such as an enamel copper wire around a cylindrical bobbin 12 made of an insulating resin, and the low-voltage coil portion 2 is inserted into the cylindrical bobbin 12. ing.

By the way, in the FBT shown in FIGS. 4 and 5, the cores 1 are electrically connected to each other via the spring 8, but the spring 8 is used as in a modification shown in FIG. No, case 4 for each core 1
Conductive adhesive 14 is provided on the side surfaces of the legs 1a exposed to the outside.
On the core 1 through the conductive adhesive 14
There is also an FBT that is configured to conduct each other. And
Also in this FBT, the leg portions 1a, 1 of the core 1 are
Insulating gap spacer plate 6 is interposed between b and this gap spacer plate 6 is bonded to each of legs 1a and 1b by using insulating adhesive 7. Unlike the FBT as described above, unlike the other modification shown in FIG. 7, the gap spacer plate 15 made of metal is connected to the legs 1a and 1b without using the spring 8 and the conductive adhesive 14. There is also a structure in which the gap spacer plate 15 interposed between the legs 1a and 1b is joined by a conductive adhesive 16 to the legs.

[0006]

However, in the FBT shown in FIGS. 4 and 5, it is necessary to electrically connect the cores 1 having the insulating gap spacer plate 6 interposed therebetween by the metal spring 8. Therefore, it is necessary to prepare the spring 8 which is a separate component and then to connect the cores 1 to each other, which increases the manufacturing cost and the labor at the time of assembly. Also in the FBT shown in FIG. 6, conductive bonding is performed on the side surfaces of the leg portions 1a in a step different from the step of joining the leg portions 1a and 1b of the core 1 with each other using the insulating adhesive 7. Since the cores 1 need to be electrically connected to each other by applying the agent 14, the manufacturing cost and the labor are also increased. Furthermore, in the FBT having the configuration shown in FIG. 7, the gap spacer plate 15 made of metal is used.
Therefore, the magnetic flux passing through the leg portions 1a of the cores 1 generates an eddy current in the gap spacer plate 15, which causes heat generation due to the eddy current loss, resulting in a decrease in reliability. Will occur.

The present invention was devised in view of these inconveniences, and an object thereof is to provide an FBT capable of reducing the manufacturing cost and the labor at the time of assembly and easily improving the reliability. I am trying.

[0008]

FBT according to the present invention
In order to achieve such an object, in a configuration including a pair of cores, each of which is U-shaped in side view and which is connected in a state where the legs are opposed to each other, at least one leg is provided. An anisotropically conductive gap spacer plate that is conductive only along the direction in which these legs face each other is interposed between them. The gap spacer plate here is made of an insulating material, has a predetermined thickness, and is embedded with a conductive material that conducts only along the facing direction of the legs. ,
It is an anisotropic conductive rubber sheet or an anisotropic conductive polymer sheet having a predetermined thickness.

[0009]

According to the above structure, since the gap spacer plate interposed between the leg portions of each core has anisotropic conductivity, the magnetic flux passing through these leg portions passes through the gap spacer plate. Therefore, the pair of cores are electrically connected to each other via the gap spacer plate.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing the entire structure of an FBT according to this embodiment, FIG. 2 is a side view showing an assembled state of a core according to a modification thereof, and FIG. 3 is an enlarged view of a gap spacer plate. It is a broken perspective view. Since the entire structure of the FBT according to this embodiment is basically the same as that of the conventional example, parts and portions in FIGS. 1 and 2 that are the same as those in FIGS. .

The FBT according to the present embodiment has a pair of cores 1 each having a U-shape in a side view and connected so that the leg portions 1a and 1b are opposed to each other, and the other side of each of the cores 1. The low-voltage coil portion 2 into which the leg portion 1b is inserted, the high-voltage coil portion 3 externally fitted to the low-voltage coil portion 2, the outer periphery of the high-voltage coil portion 3, and the insulating resin (not shown). And the case 4 filled with the core 4 is provided, and the leg portion 1 a on one side of each core 1 is exposed to the outside of the case 4. An anisotropic conductive gap spacer plate 20 is provided between the leg portions 1a on one side of the cores 1 so as to conduct only along the facing direction of the leg portions 1a. For the gap spacer plate 20, the leg portion 1a is formed by using the conductive adhesive 21.
Is joined with each.

Further, in the configuration shown in FIG.
The surface of the gap spacer plate 20 is applied to the leg portions 1a of the cores 1, but the invention is not limited to this, and each leg portion 1a and the gap spacer plate 20 are not limited to this. Conductive adhesive 2 between the surface of 20
Of course, both may be joined by applying 1. That is, the gap spacer plate 2 here
As shown in FIG. 3, 0 is a rod shape made of an insulating material 20a such as plastic or rubber, having a predetermined thickness, and conducting only along the facing direction of the legs 1a. A conductive substance 20b such as a metal or carbon in the form of a fiber or carbon is embedded. Alternatively, the gap spacer plate 20 may be made of an anisotropically conductive rubber sheet or an anisotropically conductive polymer sheet having a predetermined thickness.

Further, a gap spacer plate 6 made of an insulating resin, similar to the conventional example, is interposed between the leg portions 1b on the other side of the core 1, and the gap spacer plate 6 is insulated. The adhesive agent 7 is used and joined to each of the legs 1b. At this time, an anisotropic conductive gap spacer plate 20 may be interposed between the leg portions 1b on the other side, or alternatively, an anisotropic conductive gap spacer plate 20 may be provided between the leg portions 1a and 1b on both sides. Gap spacer plate 2
It is needless to say that 0 may be interposed, and the feature of the present invention is only between the leg portions 1a (1b) on at least one side along the facing direction of these leg portions 1a (1b). The gap spacer plate 20 of anisotropic conductivity which is conductive is interposed.

Therefore, in the pair of cores 1 constituting the FBT according to this embodiment, the leg portions 1a on one side are joined by the conductive adhesive 21 after the gap spacer plate 20 having the anisotropic conductivity is interposed. And the leg portion 1b on the other side
Since they are bonded to each other via the gap spacer plate 6 and the insulating adhesive 7, they are integrally connected. At this time, since the gap spacer plate 20 interposed between the leg portions 1a on at least one side has anisotropic conductivity, the magnetic flux passing through these leg portions 1a has a gap spacer plate. Therefore, the pair of cores 1 are electrically connected to each other via the gap spacer plate 20.

By the way, when the gap spacer plate 20 having anisotropic conductivity as described above is used, each of the cores 1 is made to be the same as when the gap spacer plate 15 made of metal described in the conventional example is used. Although the magnetic flux passing through the leg portion 1a also passes through the gap spacer plate 20, the conductivity of the gap spacer plate 20 at this time is significantly smaller than that of the gap spacer plate 15 made of metal. Therefore, this gap spacer plate 2
The generation of eddy current at 0 is suppressed as compared with the case of the conventional example, and the heat generation due to the eddy current loss is significantly suppressed. Therefore, in the FBT configured by using the gap spacer plate 20, conduction can be achieved while heat generation of the gap spacer plate 20 is suppressed, and reliability is improved.

[0017]

As described above, in the FBT of the present invention, between the leg portions on at least one side of the pair of cores, an anisotropic conductive material is provided which conducts only in the direction in which these leg portions face each other. Since the gap spacer plate is interposed, the cores are electrically connected to each other via the gap spacer plate. Therefore, as in the conventional example,
It is not necessary to connect the cores using a metal spring that is a separate component, or to apply a conductive adhesive to electrically connect the cores in a separate process. It is possible to reduce the cost and the labor at the time of assembly. Further, heat generation due to eddy current, which is caused when a gap spacer plate made of a metal is used, is suppressed, so that there is an effect that the reliability of the FBT can be easily improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an entire structure of an FBT according to this embodiment.

FIG. 2 is a side view showing an assembled state of a core according to a modified example.

FIG. 3 is a cutaway perspective view showing an enlarged gap spacer plate.

FIG. 4 is a perspective view showing an external structure of an FBT according to a conventional example.

FIG. 5 is a sectional view showing an entire structure of an FBT according to a conventional example.

FIG. 6 is a side view showing an assembled state of a core according to a modification of the related art.

FIG. 7 is a side view showing an assembled state of a core according to another conventional modification.

[Explanation of symbols]

 1 core 1a one side leg 1b other side leg 20 gap spacer plate

Claims (4)

[Claims] 1. A flyback transformer comprising a pair of cores (1) each having a U-shape when viewed from the side and having leg portions (1a, 1b) connected in a state of facing each other, An anisotropically conductive gap spacer plate (20) is provided between at least one leg portion (1a) between the leg portions (1a) so as to conduct only along the facing direction of the leg portions (1a). Flyback transformer. 2. The gap spacer plate (20) is made of an insulating material (20a), has a predetermined thickness, and conducts only along the facing direction of the legs (1a). The flyback transformer according to claim 1, wherein a conductive material (20b) is embedded. 3. The flyback transformer according to claim 1, wherein the gap spacer plate (20) is an anisotropic conductive rubber sheet having a predetermined thickness. 4. The flyback transformer according to claim 1, wherein the gap spacer plate (20) is an anisotropic conductive polymer sheet having a predetermined thickness.