JPH0737739A - High voltage generating equipment - Google Patents

Abstract

PURPOSE:To simplify structure and assembly and prevent external discharge when cracks are generated in insulating resin, by forming a twofold part in at least a part of the case of one side high voltage electronic parts positioned between a first and a second high voltage electronic parts, and forming a cutout window in the lower part of the twofold part. CONSTITUTION:A flyback transformer 20 constituting a first high voltage electronic parts is provided with a case 22 accommodating electronic parts 8. The case is, e.g. a cylinder having the bottom, and the upper surface is opened. An engaging part 10 protruding from the outer peripheral surface of the case 22 is formed, and a twofold part 24 which protrudes from the case 22 and constitutes an aproximate rectangular prism is formed inside the engaging part 10. A cutout window 26 is formed in the lower part of a surface 25 facing the outer peripheral surface of the case 22. A focus pack 2 as a second high voltage electronic parts is fixed to the flyback transformer 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high voltage generator for combining a flyback transformer and a focus pack for applying a high DC voltage to a cathode ray tube of a television receiver, a display device or the like. Is.

[0002]

2. Description of the Related Art A conventional high voltage generator is applied to a conventionally known combination of a flyback transformer and a focus pack, as an example, with reference to FIGS.

FIG. 3 is a circuit diagram of a high voltage generator including a flyback transformer 1 and a focus pack 2 which constitute first and second high voltage electronic components. As is clear from FIG. 3, the flyback transformer 1 constituting the first high-voltage electronic component includes a low-voltage coil 3, a high-voltage coil 4 divided into a plurality of parts, and a diode connected alternately in series with a high-voltage coil 4. It is composed of 5. Further, the focus pack 2 forming the second high-voltage electronic component attached to the flyback transformer 1 includes a high-voltage variable resistor 6
The supply terminal A of the flyback transformer 1 and the input terminal B of the focus pack 2 are electrically connected to each other using a connection line 7.

FIG. 4 shows a schematic block diagram of the above-mentioned high voltage generator. In FIG. 4, the flyback transformer 1
Is an electronic component 8 such as a low-voltage coil, a high-voltage coil, a core, and a plurality of diodes that are housed inside and one side of which is open.
For example, the case 9 has a bottomed cylindrical case 9, and a fitting portion 10 for integrally fitting the focus pack 2 to the flyback transformer 1 is projected on the outer peripheral surface of the case 9. It is formed. Fitting part 1 provided in case 9
0 is the same surface as the open surface of the case 9 and the case 9
The outer peripheral surface and the surface facing each other are open. Further, a partition wall 11 is provided in a lower part corresponding to the case 9 located in the fitting part 10, and a cutout part 12 is provided in an upper part. The connection wire 7 electrically connected to the supply terminal A provided in the high-voltage coil housed in the case 9 extends to the outside of the fitting portion 10 through the cutout portion 12.

On the other hand, the focus pack 2 has a case 13 of, for example, a rectangular parallelepiped shape, and the case 13 has a fitting portion 1 for integrally fitting with the flyback transformer 1.
4 are provided. A high-voltage variable resistor 6 is mounted inside the focus pack 2, the input terminal B provided on the high-voltage variable resistor 6 is projected toward the fitting portion 14 side, and the inside of the case 13 is sealed with a resin 15. Is.

The focus pack 2, which is the second high-voltage electronic component, is assembled to the flyback transformer 1, which is the first high-voltage electronic component having the above structure. At this time, the connection line 7 led out from the supply terminal A of the flyback transformer 1 through the cutout portion 12 is entangled with the input terminal B of the focus pack 2 and soldered to electrically connect them. To do.
Next, the fitting portion 10 of the flyback transformer 1 and the fitting portion 14 formed on the focus pack 2 are fitted and fixed to each other. After this, the case 9 of the flyback transformer 1
An epoxy-based insulating resin (not shown) is injected into the inside. At this time, a part of the insulating resin is notched 12
Via flyback transformer 1 and focus pack 2
In between, that is, the inside of the fitting portion 10 and the case 13 (fitting portion 14) of the focus pack 2 are also filled. Then, the insulating resin is cured to seal the electronic components in the case 9 and the connecting wires 7 with the insulating resin, and the flyback transformer 1
A high voltage generator in which the focus pack 2 and the focus pack 2 are integrated is obtained.

[0007]

However, in such a structure, due to discharge or heat shock generated between the high-voltage portion in the case of the flyback transformer and the case, there is a long-term near-high voltage in the case. In some cases, cracks may occur inside the insulating resin. In particular, the case existing between the flyback transformer and the focus pack is a single layer of the partition wall 11, and if a crack occurs in the filled insulating resin, the crack may rarely progress to the case. Finally, there was a possibility of causing an external discharge.

Such a phenomenon occurs not only when a flyback transformer and a focus pack are combined, but also when a cover is attached to a high voltage block composed of a variable resistor and a high voltage capacitor.

The object of the present invention is to solve the above problems, the structure is simple and the assembling workability is good, and further, even if a crack occurs inside the insulating resin, an external discharge does not occur. It is to provide such a highly reliable high voltage generator.

[0010]

Therefore, in the present invention, the first and second high-voltage electronic components, which are formed by disposing the electronic components in the case and connecting the electronic components to each other, are provided. A high-voltage generator in which the other high-voltage electronic component is fitted and fixed on the outer periphery of the case of the high-voltage electronic component, and the case of the first and second high-voltage electronic components is filled with an insulating resin, At least a part of the case of the one high-voltage electronic component located between the first and second high-voltage electronic components is doubled to provide a double portion, and a cutout window is provided under the double portion. It is characterized by being provided.

[0011]

The present invention has the above-mentioned configuration,
The insulating resin deteriorates due to the effects of discharge, heat shock, etc. generated between the high-voltage portion of the case and the case, between the first and second high-voltage electronic components, or between the high-voltage electronic component and the cover. Even when the insulating resin is deteriorated and a crack is generated inside the insulating resin, the progress of the crack can be stopped by one of the cases in which the insulating resin is divided into layers or by the double portion formed on the cover.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. 1 by taking as an example a structure in which a focus pack is fitted and fixed to a flyback transformer. However, the same parts as those of the above-described conventional example are designated by the same reference numerals, and detailed description thereof will be omitted. The circuit configuration of the present invention is the same as that of the conventional example shown in FIG.

In the high voltage generator of this embodiment, as shown in FIG. 1, the flyback transformer 20 which is the first high voltage electronic component has the electronic component 8 housed therein,
For example, a case 22 having a bottomed cylindrical shape with one open surface is provided, and the case 22 projects from the case 22 inside the fitting part 10 and the fitting part 10 formed to project on the outer peripheral surface of the case 22. It is composed of a substantially rectangular parallelepiped double portion 24 formed. The double portion 24 is open on the same surface as the open surface of the case 22, and has a cutout window 26 below the surface 25 facing the outer peripheral surface of the case 22. And a partition wall 11 provided in a part of the lower part corresponding to the above, forms a double structure. A cutout portion 27 is provided in a part above the partition wall 11. The connecting wire 7 whose one end is electrically connected to the supply terminal A provided in the high voltage coil housed in the case 22 extends through the cutout portion 27 from the cutout window 26 to the outside of the fitting portion 10. I have put it out.

The focus pack 2 which is the second high-voltage electronic component is assembled to the flyback transformer 20 which is the first high-voltage electronic component having the above structure. At this time, the double portion 24 is located between the flyback transformer 20 and the focus pack 2. After that, for example, an epoxy-based insulating resin (not shown) is injected into the case 22, the fitting portion 10 and the space portions 28, 29 and 30 of the double portion 24 of the flyback transformer 20 for sealing. . On this occasion,
Case 22, space portion 28 between fitting portion 10 and double portion 24,
If the insulating resin is injected into at least one of the positions 29 and 30, the cutout window 26 and the cutout portion 27 of the double portion 24 are formed.
The space portions 28, 29, 30 are filled with insulating resin via. The flyback transformer 20 and the focus pack 2 in which the insulating resin is injected into the spaces 28, 29, 30.
Is to obtain a high voltage generator by being placed in a dryer or the like and heated to a high temperature to cure the insulating resin.

Here, the insulating layer from the electronic component 8 housed in the flyback transformer 20 to the focus pack 2 which is the second high voltage electronic component is an insulating resin, a partition wall 11, an insulating resin, Since there are five layers including the overlapping portion 24 and the insulating resin, the number of layers is increased by two layers compared with the conventional three layers of the insulating resin, the partition wall 11 and the insulating resin.

Next, a second embodiment of the present invention will be described with reference to FIG.
I will explain based on.

In the high voltage generator of this embodiment, as shown in FIG.
As shown in, the high voltage block 40 which is a high voltage electronic component.
Is provided with a substantially rectangular parallelepiped case 42 in which electronic parts 41 such as a variable resistor and a high-voltage capacitor are housed, and two surfaces are opened. A fitting portion 44 that fits with the cover 43 is formed on one open surface of the case 42, and an opening connected to the space 45 inside the case 42 is formed on the other surface. The cover 43 has a substantially rectangular parallelepiped shape, and 2
The surface is open. One open surface of the cover 43 constitutes a fitting portion 47 with the high-pressure block 40, and the other surface forms an opening connected to the space 48 inside the cover 43. Inside the cover 43, a double portion 49 is formed at a high voltage portion of the electronic component 41 in the high voltage block 40 and parallel to the fitting surface of the fitting portion 47. The double part 49 has a cutout window 50 in a part of the lower part, and is open in the upper part.

The cover 43 is assembled to the high-voltage block 40 which is a high-voltage electronic component having such a structure. At this time, the double portion 49 of the cover 43 is located on the open surface side of the high pressure block 40 on the fitting portion 44 side. After that, for example, an epoxy-based insulating resin (not shown) is injected into the space portions 45 and 48 of the case 42, the cover 43, and the double portion 49 of the high-voltage block 40 to seal them. At this time, case 4
2, if the insulating resin is injected into at least one of the space portions 45 and 48 between the fitting portion 44 and the double portion 49, the double portion 49
The space portions 45 and 48 are filled with the insulating resin through the cutout window 50. The high-voltage block 40 and the cover 43, in which the insulating resin is injected into the spaces 45 and 48, are placed in a dryer or the like to be heated to a high temperature, and the insulating resin is cured to obtain a high voltage generator.

Here, the insulating layer from the electronic component 41 housed in the high-voltage block 40 to the cover 43 has four layers including the insulating resin, the double portion 49, the insulating resin, and the outer wall of the cover 43. Therefore, the number of layers is increased by 2 layers compared to the conventional 2 layers of insulating resin and case.

[0020]

In the high voltage generator according to the present invention, the case or cover of the high voltage electronic component is doubled, and the insulating resin and the case or cover made of different materials are alternately arranged in five layers or four layers. Therefore, even if a crack occurs in the insulating resin inside the case that constitutes the first high-voltage electronic component, and even if the crack is transmitted to the case, the crack generated inside the insulating resin is difficult to propagate between layers. ,
The progress of cracks can be prevented by the insulating resin and the double part in the case. As a result, even if the high voltage generator is used for a long period of time, external discharge is not reached, and the reliability is greatly improved.

Further, since the cutout window is provided in a part of the double portion, it is possible to fill the insulating resin once even though there are a plurality of spaces filled with the insulating resin. The sex can be as simple as the conventional one.

[Brief description of drawings]

FIG. 1 is an exploded perspective view when applied to a flyback transformer and a focus pack according to a first embodiment of a high voltage generator of the present invention.

FIG. 2 is an exploded perspective view when applied to a high voltage block and a cover according to a second embodiment of the high voltage generator of the present invention.

FIG. 3 is a circuit diagram when a flyback transformer and a focus pack are applied as a high voltage generator.

FIG. 4 is an exploded perspective view of a flyback transformer and a focus pack forming a conventional high voltage generator.

[Explanation of symbols]

2 focus pack (second high-voltage electronic component) 7 connection wire 10 fitting part 20 flyback transformer (first
High voltage electronic parts) 22,42 Case 24,49 Double part 26,50 Notched window 28,29,30,45,48 Space part 40 High voltage block 43 Cover

Claims (2)

[Claims] 1. A first and a second high-voltage electronic component, in which electronic components are arranged in a case and the electronic components are connected to each other, are provided on the outer periphery of the case of one high-voltage electronic component. A high-voltage generator in which voltage electronic components are fitted and fixed, and a case of the first and second high-voltage electronic components is filled with an insulating resin, wherein the first and second high-voltage electronic components are connected to each other. A high-voltage generator characterized in that at least a part of the case of one high-voltage electronic component located at 1 is doubled to provide a double portion, and a cutout window is provided at a lower portion of the double portion. 2. A cover of a high-voltage electronic component, wherein a cover is fitted and fixed to a case of a high-voltage electronic component in which electronic components are arranged in the case and the electronic components are connected to each other. In a high voltage generator in which an insulating resin is filled in between, a double portion is provided by duplicating at least a part of the cover, and a cutout window is provided in a lower portion of the double portion. High voltage generator.