JP2000077201A - High voltage connection terminal block for high voltage variable resistor - Google Patents

Abstract

(57) [Problem] To provide a high-voltage variable resistor in a terminal block shape in which a portion to which high voltage of a high-voltage connection terminal is directly applied and an inner surface of a high-voltage variable resistor case are directly connected along the surface. In order to maintain this creeping dielectric strength at a uniform and flat creeping surface, stresses such as thermal expansion and contraction cause peeling of the crimping portion of the terminal block and the insulating material filled in the FBT. Is easily destroyed by external discharge. SOLUTION: In a high-voltage variable resistor, a terminal block made of an insulating material of a high-voltage connection fitting is formed into a cylindrical shape having a plurality of steps having different diameters, so that a crest portion of the terminal block and a creepage of an insulating material filled in the FBT are provided. And improve the dielectric strength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage variable resistor integrally fitted to a flyback transformer (hereinafter, FBT) used in a display device using a cathode ray tube used in a color television receiver or a computer terminal. It is about a vessel.

[0002]

2. Description of the Related Art FIGS. 4, 5 and 6 show a prior art. That is, a high-voltage variable resistor 1 having a back surface filled with an epoxy resin 9 as an insulating material, a high-voltage variable resistor case 1a containing a high-voltage capacitor 7 and a high-voltage fixed resistor 8, and FIG.
The high-voltage connection fitting 2 connected to the FBT at the portion (A) shown, the terminal block 4 of a box-shaped high-voltage connection fitting, a DAF capacitor 5 disposed on the epoxy resin, and a similarly-positioned hocus smoothing plate High-voltage capacitor ground terminal 7 to which the low-voltage connection line of capacitor 6 and high-voltage capacitor 7 is attached
a, a high-voltage fixed resistor ground terminal 8a to which the low-voltage side connection line of the high-voltage fixed resistor 8 is mounted, a feedback voltage output terminal 8b to which the feedback output connection line of the high-voltage fixed resistor 8 is mounted, and voltage division by the high-voltage variable resistor A terminal 10a for outputting the measured hocus voltage, a terminal 10b for inputting the DAF pulse voltage, a metal fitting 11a for connecting the terminal 10a for outputting the hocus voltage from a high-voltage variable resistor, and a terminal 10b for inputting the DAF pulse voltage to the DAF capacitor 5. It is composed of a metal fitting 11b to be connected, a terminal 12 for outputting a screen voltage divided from the high-voltage variable resistor 1, a ground terminal 13 on the low-voltage side of the high-voltage variable resistor 1, and a shaft 14 for adjusting the hocus voltage of the high-voltage variable resistor 1. It is a high voltage variable resistor.

Next to the high-voltage variable resistor 1 filled with the epoxy resin 9, a high-voltage variable resistor sandwiched between a rib 1 c and a rib 1 d integrally formed with the case 1 a mounted in parallel with the high-voltage fixed resistor 8. A high voltage condenser 7 is disposed in parallel with the high voltage variable resistor 8 with the rib 1d interposed therebetween.

A box-shaped terminal block 4 integrally formed with the high-voltage variable resistor case 1a and partially having a concave portion has a concave portion 4a into which the high-voltage fitting 2 is inserted and a creepage portion 4b connected to the case 1a.
And a pedestal portion 4c. Further, the terminal block 4 is provided with a high-voltage capacitor connection terminal block 4d and a high-voltage fixed resistor connection terminal block 4e, respectively, and is arranged in a right angle direction. The terminal block 4 has a structure in which the holding portion 2d of the high-voltage connection fitting 2 is inserted into the recess 4a.

The high-pressure connection fitting 2 has a groove 2a and a groove 2b, and further comprises a projection 2c connected to the FBT main body at a portion shown in FIG. 7A, and the projection 2c is an insertion portion of the terminal block. 4a. Further, the high voltage side lead 7b of the high voltage capacitor is connected to the groove 2a of the high voltage connection fitting, and the high voltage side lead 8c of the high voltage fixed resistor is connected to the groove 2b of the high voltage connection fitting to be connected to the FBT main body.

[0006]

In the high-voltage variable resistor integrated with the FBT, the high-voltage connection terminal fitting 2 has an F terminal.
A high voltage of BT of about 28-33 KV is applied directly. In the above-mentioned conventional technique, the inner surface portion 1b of the case 1a
In the shape of the terminal block 4 which is directly connected to the surface by creeping, in order to maintain the creeping dielectric strength between the inner surface portion 1b of the case and the high-voltage connection fitting 2 by the uniform and flat creeping portion 4b, the thermal expansion and contraction due to the use environment is made. Due to such stress, the terminal block surface 4b and the FBT-filled resin 16 are separated,
When the dielectric strength decreases, destruction due to high-voltage external discharge is likely to occur.

[0007]

In order to solve the above-mentioned problems, in the present invention, a plurality of cylindrical insulating materials different from each other are stacked, and a concave portion for attaching a high-voltage connection fitting to the uppermost cylinder is formed.

[0008]

According to the present invention, since the degree of adhesion between the terminal pedestal portion and the filling resin of the FBT becomes stronger, the terminal pedestal portion and the filling resin remain in contact with each other even when stress is applied due to thermal expansion and contraction. Peeling hardly occurs during

An embodiment of the present invention will be described below with reference to FIGS. 1, 2 and 3. That is, a high-voltage variable resistor 1 having a back surface filled with an epoxy resin 9 as an insulating material, a high-voltage variable resistor case 1a containing a high-voltage capacitor 7 and a high-voltage fixed resistor 8, and an FBT in a portion (A) shown in FIG. High-voltage connection fitting 2, terminal blocks 3 of two cylindrical high-pressure connection metal fittings different from each other and a DAF capacitor 5 disposed on epoxy resin, and the like. Hokas smoothing capacitor 6,
A high-voltage capacitor ground terminal 7a to which the low-voltage connection of the high-voltage capacitor 7 is mounted, a high-voltage fixed resistor ground terminal 8a to which the low-voltage connection of the high-voltage fixed resistor 8 is mounted, and a feedback output connection to the high-voltage fixed resistor 8 are mounted. A feedback voltage output terminal 8b, a terminal 10a for outputting a hocus voltage divided by the high-voltage variable resistor,
A metal fitting 11 connected to a terminal 10b for inputting a pulse voltage and a terminal 10a for outputting a focus voltage from a high-voltage variable resistor.
a, from the terminal 10b for inputting the DAF pulse voltage,
A metal fitting 11b connected to the AF capacitor 5, a terminal 12 for outputting a screen voltage divided from the high-voltage variable resistor 1, and a ground terminal 1 on the low-voltage side of the high-voltage variable resistor 1.
3. The high voltage variable resistor is constituted by a shaft 14 for adjusting the focus voltage of the high voltage variable resistor 1.

Next to the high-voltage variable resistor 1 filled with the epoxy resin 9, a high-voltage variable resistor sandwiched between a rib 1 c and a rib 1 d integrally formed with the case 1 a mounted in parallel with the high-voltage fixed resistor 8. The high-voltage capacitor 7 is disposed in parallel with the high-voltage variable resistor 8 with the rib 1d interposed therebetween.

A cylindrical terminal block 3 integrally formed with the high-voltage variable resistor case 1a and partially having a concave
And a plurality of cylindrical portions 3b of different diameters connected to the case 1a and a pedestal portion 3c of each cylindrical portion.

Further, the terminal blocks 3 are arranged in a right-angle direction by arranging two high-voltage capacitor connecting terminal blocks 3d and a high-voltage fixed resistor connecting terminal blocks 3e as a set of two close to each other. Each of the two terminal blocks 3 has a structure in which the holding portion 2d of the high-voltage connection fitting 2 is inserted into the concave portion 3a arranged on a straight line. With this structure, the high-pressure connection fitting can be stably held.

The high-pressure connection fitting 2 has a groove 2a and a groove 2b, and further comprises a projection 2c connected to the FBT main body at the portion shown in FIG. 7A, and the projection 2c is the insertion portion 4 of the terminal block.
a. Further, the high voltage side lead 7b of the high voltage capacitor is connected to the groove 2a of the high voltage connection fitting, and the high voltage side lead 8c of the high voltage fixed resistor is connected to the groove 2b of the high voltage connection fitting.
It is structured to be connected to the BT body.

As shown in FIG. 2A, the FBT main body 15 and the high-voltage variable resistor 1 are fitted and connected by a high-voltage connection fitting 4, and are integrated to form an FBT by filling an insulating material 16.

The maximum temperature difference expected in the use environment of the high-voltage variable resistor of the present invention integrated with the FBT and commercialized is -20 ° C to 100 ° C. For example, a terminal block formed of insulating material PBT (coefficient of linear expansion 47 × 10 ⁻⁶ ) and epoxy resin as a filling resin of FBT (coefficient of thermal expansion 44 × 10 ⁻⁶ )
Has a small difference in expansion due to heat, but due to poor adhesion, a maximum difference of 0.0109
According to the present embodiment, the terminal block 3 is distorted by 2 mm / mm.
The cylindrical shape of の is less than half that of the conventional box-shaped terminal block 4 with a uniform plane dimension from 11 mm to 4.7 mm in the terminal block width direction (B) and 13.7 mm to 6.5 mm in the vertical direction (C). Therefore, the amount of distortion also increased from 0.12 mm to 0.05 mm in the width direction and from 0.15 mm to 0.07 mm in the vertical direction. Strain due to temperature differences concentrated on corners, etc. by making the uniform flat surface cylindrical. By avoiding this, a decrease in the dielectric strength due to the peeling of the surface of the terminal block 3 and the FBT-filled resin 16 due to thermal expansion and contraction was prevented, and the strength against destruction by external discharge was improved.

According to the confirmation by the operational thermal shock test, it was possible to obtain more than twice the effect of the present invention in the time until the destruction.

Further, by dividing the conventional high-voltage connection terminal block into two parts, the thickness of the insulating material of the high-voltage connection terminal block is also reduced from the maximum thickness of 6.4 mm to 3.25 mm at (D). Was. As a result, the generation of air bubbles in the molded product due to the resin molding having an uneven thickness can be reduced, and the effect of improving reliability can be obtained.

[0018]

According to the present invention, the terminal base portion and the FBT are
Since the degree of adhesion to the filling resin becomes stronger, even if stress due to thermal expansion and contraction is applied, it is possible to prevent the occurrence of peeling between the terminal pedestal portion and the filling resin and suppress discharge to the outside. it can.

[Brief description of the drawings]

FIG. 1A is a front view of a high-voltage variable resistor including a high-voltage capacitor and a high-voltage fixed resistor according to an embodiment of the present invention. FIG. 1B is a diagram illustrating a high-voltage capacitor and a high-voltage fixed resistor according to an embodiment of the present invention. Sectional view of high-voltage variable resistor with built-in

FIG. 2A is an enlarged view of a high-voltage connection fitting according to one embodiment of the present invention; FIG. 2B is an external view of a high-voltage variable resistor incorporated in an FBT according to one embodiment of the present invention;

FIG. 3A is a perspective view of a terminal block made of an insulating material of a high-voltage connection fitting according to an embodiment of the present invention. FIG. 3B is a cross-sectional view of the terminal block made of an insulating material of a high-voltage connection fitting according to an embodiment of the present invention. Figure

FIG. 4A is a front view of a conventional high-voltage variable resistor including a high-voltage capacitor and a high-voltage fixed resistor. FIG. 4B is a cross-sectional view of a conventional high-voltage variable resistor including a high-voltage capacitor and a high-voltage fixed resistor.

FIG. 5 is an enlarged view of a conventional high-pressure connection fitting.

6A is a perspective view of a terminal block made of an insulating material of a conventional high-voltage fitting, and FIG. 6B is a cross-sectional view of a terminal block made of an insulating material of a conventional high-pressure fitting.

FIG. 7 is an internal electric circuit diagram of a FBT to which a high-voltage variable resistor is connected.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 high voltage variable resistor 1a high voltage variable resistor case 1b high voltage variable resistor case inner surface 2 high voltage connection fitting connected to FBT 2a high voltage capacitor high voltage side lead wire connection groove 2b high voltage fixed resistance high voltage side lead connection wire groove 2c FBT Projection for connection to the main body 2d Holding part 3 Terminal block 3a made of insulating material of cylindrical high voltage connection fittings 3a different from each other 3a High pressure connection fitting mounting recess 3b Plural cylindrical parts 3c of different diameters 3c Base 3d High-voltage capacitor connection terminal block 3e High-voltage fixed resistor connection terminal block 4 Terminal block made of insulating material of box-shaped high-voltage connection fitting 4a High-pressure connection fitting mounting recess 4b Surface 4c Base 4d High-voltage capacitor connection Terminal block 4e High voltage fixed resistor connection terminal block 5 DAF capacitor 6 Hokas smoothing capacitor 7 High voltage capacitor 7a High-voltage capacitor ground terminal 7b High-voltage capacitor high-side connection line 8 High-voltage fixed resistor 8a High-voltage fixed resistor ground terminal 8b Feedback voltage output terminal 8c High-voltage fixed resistor high-side connection line 9 Epoxy resin as insulating material for high-voltage variable resistor DESCRIPTION OF SYMBOLS 10 Output terminal 10a Hokas voltage output terminal 10b DAF pulse voltage input terminal 11 Connection metal 11a Hokas output terminal connection metal 11b DAF input terminal connection metal 12 Screen voltage output terminal 13 High voltage variable resistor ground terminal 14 Hocus voltage adjustment shaft 15 FBT main body 16 FBT filling resin (A) Connection point by high-pressure connection bracket (B) Terminal block horizontal dimension (C) Terminal block vertical dimension (D) Terminal block thickness dimension

Claims (2)

[Claims] 1. A high-voltage connection metal fitting terminal block for a flyback high-voltage variable resistor in which a plurality of cylindrical insulating materials different from each other are stacked and a concave portion for mounting a high-voltage connection metal fitting is formed in the uppermost cylinder. 2. The high-voltage connection fitting terminal block of a high-voltage variable resistor according to claim 1, wherein the positions of the recesses of the uppermost cylinder for holding the high-voltage connection fitting are aligned in a straight line.