JPH07335460A - Fly-back transformer - Google Patents

Abstract

PURPOSE:To provide a fly-back transformer of a structure that the production cost of the transformer and the labor, which is required at the time of assembly of the transformer, can be reduced. CONSTITUTION:A gap spacer plate 20 formed using a conductive material- containing insulative resin is interposed between leg parts 1a (1b) on the sides on at least one side of the sides of one pair of cores 1. This plate 20 is bonded to the leg parts 1a (1b) of the cores 1 using a conductive bonding agent 21. As the conductive material in the case where the plate 20 is formed here, a carbon conductor, such as a carbon black, a graphite or an acetylene black, is used.

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 FIG. 3 and FIG.
, 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, the FBT shown in FIGS. 3 and 4 employs a structure in which the cores 1 are electrically connected to each other by the spring 8. However, as a structure other than this, as shown in a modification of FIG. , Without using the spring 8, the conductive adhesive 14 is applied on the side surfaces of the leg portions 1a exposed to the outside of the case 4 of each core 1,
There is also one that electrically connects the cores 1 to each other via the conductive adhesive 14. Also in this case, the leg portions 1a and 1b of the core 1 are bonded to each other with the gap spacer plate 6 interposed therebetween and the insulating adhesive 7.

[0006]

However, in the FBT shown in FIGS. 3 and 4, the pair of legs 1a and 1b are joined together via the gap spacer plate 6 having an insulating property. The core 1 is a metal spring 8
Therefore, it is necessary to prepare the spring 8 as a separate component and then connect the cores 1 to each other because it is necessary to connect the cores 1 to each other, which increases the manufacturing cost and the labor for assembling. turn into. Also in the FBT shown in FIG. 5, it is necessary to apply the conductive adhesive 14 in a step different from the step of joining the leg portions 1a and 1b of the core 1 to each other using the insulating adhesive 7. As a result, the manufacturing cost and the labor are increased.

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.

[0008]

FBT according to the present invention
In order to achieve such an object, a gap spacer plate made of an insulating resin containing a conductive material is interposed between at least one leg of the pair of cores. . The gap spacer plate is joined to the leg portion of the core using a conductive adhesive. In addition, as the conductive material when the gap spacer plate is manufactured here, a carbon-based conductor such as carbon black, graphite, or acetylene black is used.

[0009]

According to the above structure, the gap spacer plate has a conductivity corresponding to the amount of the conductive material added to the insulating resin, and the gap spacer plate is interposed between at least one leg portion. The pair of cores thus formed 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, and FIG. 2 is a side view showing an assembled state of a core which constitutes an FBT according to a modification. In addition,
Since the entire structure of the FBT according to the present embodiment and the modified example is basically the same as that of the conventional example, the structure shown in FIG.
The same parts and portions as those in FIG. 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

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. A gap spacer plate 2 having a predetermined thickness, which is made by using an insulating resin containing a predetermined amount of a conductive substance, is provided between the leg portions 1a on one side.
0 is installed.

That is, this gap spacer plate 20
Are conductive materials such as carbon black, graphite,
While a carbon-based conductor such as acetylene black is used, modified PPO (polyphenylene oxide), PET (polyethylene terephthalate), PC having an insulating resin with a specific resistance of about 10 ⁻³ to 10 ⁶ Ω · cm.
The gap spacer plate 20 is made by using (polycarbonate), polyolefin or the like, and the gap spacer plate 20 made by using an insulating resin containing a conductive substance of about 1 to 50 wt% corresponds to the addition amount of the conductive substance. It has the electric conductivity that Further, at this time, as shown in FIG. 1, the gap spacer plate 20 interposed between the leg portions 1a is applied to each of the leg portions 1a after using a commercially available general conductive adhesive 21. It is joined. In the FBT of FIG. 1, the surface of the gap spacer plate 20 is applied to the leg 1a on one side of each core 1, but the present invention is not limited to this, and as shown in FIG. In addition, each leg 1a and the gap spacer plate 20
You may join both by applying the electroconductive adhesive agent 21 with the surface of this. At this time, the conductive adhesive 21 may of course cover the entire surface of the gap spacer plate 20.

Further, the leg portion 1b on the other side of the core 1 is provided.
A gap spacer plate 6 made by using an insulating resin similar to the conventional example is interposed between the gap spacer plate 6 and the gap spacer plate 6 using the insulating adhesive 7 and then the leg portion 1b. Bonded to each.
The gap spacer plate 20 may be interposed between the leg portions 1b on the other side, or alternatively, the gap spacer plate 20 may be interposed between the leg portions 1a and 1b on both sides.
Of course, the features of the present invention include
A gap spacer plate 20 made of an insulating resin containing a conductive material is interposed between at least one leg portion 1a (1b).

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 is interposed, and the other side is also formed. Since the leg portions 1b are joined together by the insulating adhesive 7 after the gap spacer plate 6 is interposed therebetween, 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 a conductivity corresponding to the amount of the conductive substance added, the pair of cores 1 has the gap spacers. They are electrically connected to each other via the plate 20.

Although not shown, in the sense of ensuring conduction between the cores 1, it is produced by using, for example, a conductive metal as it is, instead of the insulating resin containing a conductive substance as described above. It is also possible to interpose a gap spacer plate between the leg portions 1a (1b). However, when the gap spacer plate is made of a conductive metal, the eddy current loss associated with the passage of the magnetic flux causes the gap spacer plate to generate heat, which reduces the reliability of the FBT. . On the other hand, when the gap spacer plate 20 made of the above material is used, there is an advantage that the cores 1 can be electrically connected to each other in a state where there is no fear of eddy current loss and heat generation.

[0017]

As described above, the F according to the present invention
The gap spacer plate in the BT has a conductivity corresponding to the amount of the conductive material added to the insulating resin, and the cores interposed between the leg portions on at least one side are the gap spacer plates. In addition, they are connected to each other in an electrically conductive state.
Therefore, there is no need to connect the cores using a spring prepared as a separate component, or to apply a conductive adhesive for conducting the cores in a separate process at all, The effect that the manufacturing cost and the labor at the time of assembling can be reduced can be obtained.

[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 that constitutes an FBT according to a modification.

FIG. 3 is a perspective view showing an external structure of an FBT according to a conventional example.

FIG. 4 is a sectional view showing an entire structure of an FBT according to a conventional example.

FIG. 5 is a side view showing an assembled state of a core forming an FBT according to a conventional modification.

[Explanation of symbols]

 1 core 1a one side leg 1b other side leg 20 gap spacer plate 21 conductive adhesive

Claims (3)

[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, A flyback transformer characterized in that a gap spacer plate (20) made of an insulating resin containing a conductive substance is interposed between at least one leg portion (1a). 2. 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, A gap spacer plate (20) made of an insulating resin containing a conductive substance is interposed between at least one leg portion (1a), and the gap spacer plate (20) is A flyback transformer, characterized in that it is joined to the legs (1a) using a conductive adhesive (21). 3. The flyback transformer according to claim 1, wherein the conductive material is a carbon-based conductor such as carbon black, graphite, or acetylene black.