JPH08124727A - Variable resistor for high voltage - Google Patents

Abstract

PURPOSE: To provide a highly reliably variable resistor for high voltage which is improved in insulating property by increasing the creeping distance and spatial distance between a high-voltage fixed resistor and substrate. CONSTITUTION: In a case 1, a substrate housing section 2 and high-voltage resistor housing section 3 are provided in such a way that the sections 2 and 3 are separated from each other by a partition wall 4 and a holder fitting rib 9 is provided in the section 3. A substrate 5 constituting a variable resistor section is housed in the section 2 and a high-voltage fixed resistor 11 is housed in the section by fixing a holder 8 to the rib 9 while the resistor 11 is fixed to the holder 8.

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 used for a TV receiver, a CRT display, etc., and more particularly to a fixing structure for a high-voltage fixed resistor housed in the case of the high-voltage variable resistor. .

[0002]

2. Description of the Related Art Conventionally, a high voltage variable resistor of this type is constructed as shown in FIGS. 5 and 6, for example. Figure 5
6 is a rear view of the high-voltage variable resistor, and FIG. 6 is X- of FIG.
It is a principal part sectional view of an X-ray.

As shown in FIGS. 5 and 6, this high-voltage variable resistor is provided in a case 1 made of synthetic resin having an opening on one side.
A board housing 2 and a high voltage fixed resistor housing 3 located adjacent to the board housing 2 are provided, and a partition wall 4 is formed between the housings 2 and 3. Case 1
The substrate 5 on which the coated film resistor including the arcuate variable resistance portion is formed on the surface opposite to the bottom surface of the substrate is adhesively fixed to the support step formed on the inner wall surface of the substrate housing 2, and the opening of the substrate housing 2 is formed. Resin 6 (omitted in FIG. 5) is filled on the surface side. A required number of lead terminals 7, 7, 7, 7 are attached to the substrate 5 so as to project from the resin 6.

A high voltage fixed resistor 11 is housed in the high voltage fixed resistor housing portion 3 via a holder 8 attached to the partition wall 4. As shown in FIG. 7, the holder 8 is made of synthetic resin and has an upward U-shape for holding and fixing the downward U-shaped case mounting portions 8a, 8a for external fitting and fixing to the partition wall 4 and the high-voltage fixing resistor 11. The high voltage fixed resistor fixing portions 8b, 8b are integrally formed. Then, with the lower part of the high voltage fixed resistor 11 inserted and fixed in the high voltage fixed resistor fixing parts 8b, 8b, the case attachment parts 8a, 8a are locked to the upper edge of the partition wall 4, and the high voltage fixed resistor is fixed. 11 are stored.

The high-voltage fixed resistor 11 is formed by coating an insulating substrate on which a film resistor is formed, and has a pair of lead terminals 12 and 13. One lead terminal 12 is one of the substrates 5.
One lead terminal 7 is connected in series with the film resistor formed on the substrate 5, and a high voltage output from a high voltage generator such as a flyback transformer is supplied to the other lead terminal 13.
It is designed to be input to.

Although not shown, a rotary shaft having a slider is attached to the bottom of the substrate housing portion 2, and the slider slides on the variable resistance portion of the film resistor of the substrate 5. It is like this. In addition, other lead terminals 7, 7, 7 of the substrate 5
A lead wire for grounding or output is connected to.

The high-voltage variable resistor thus constructed is incorporated in a high-voltage generating device such as a flyback transformer, and the hard resin filled in the device includes the high-voltage fixed resistor accommodating portion 3. The entire area on one opening surface side is filled.

[0008]

However, in the above-mentioned conventional high-voltage variable resistor, the holder 8 for holding and fixing the high-voltage fixed resistor separates the substrate housing portion 2 and the high-voltage fixed resistor housing portion 3 from each other. Since it is directly mounted on the partition 4, the distance between the high-voltage fixed resistor 11 and the substrate 5 along the surfaces of the partition wall 4 and the holder 8 (hereinafter, referred to as creepage distance)
Also, there is a problem that the space distance between the high voltage fixed resistor 11 and the substrate 5 is shortened, and the insulation between the high voltage fixed resistor 11 and the substrate 5 is low.

An object of the present invention is to solve the above problems of the conventional high voltage variable resistor and to increase the creepage distance and the space distance between the high voltage fixed resistor and the substrate forming the variable resistance portion. And to provide a high voltage variable resistor having improved insulation.

[0010]

In order to achieve the above-mentioned object, the present invention provides a variable resistance with a substrate storage section and a high voltage fixed resistor storage section provided in a case having a one-sided opening, separated by a partition wall. A substrate on which a film resistor including a portion is formed is accommodated in the substrate accommodating portion, and the high voltage fixed resistor is accommodated in the high voltage fixed resistor by using a holder having a high voltage fixed resistor fixing portion and a case mounting portion. In the high voltage variable resistor housed in the housing, a holder mounting rib is provided in the high voltage fixed resistor housing at a distance from the partition wall, and the high voltage fixed resistor is fixed to the high voltage fixed resistor fixing part. The high-voltage fixed resistor is housed in the high-voltage fixed resistor housing part by fixing the holder to the holder mounting rib at the case mounting part.

[0011]

According to the above construction, since the holder mounting rib is provided in the high voltage fixed resistor accommodating portion of the case, and the holder to which the high voltage fixed resistor is fixed is fixed to the holder mounting rib. The creepage distance and the space distance to the substrate can be increased, and thus the insulation between the high voltage fixed resistor and the substrate can be improved.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing the embodiments thereof. In the figure, the same or corresponding parts and those having the same functions as those in the conventional example are designated by the same reference numerals.

The structure of a high voltage variable resistor according to an embodiment of the present invention is shown in FIGS. 1 is a rear view of the high-voltage variable resistor, and FIG. 2 is a cross-sectional view of the main part taken along line XX of FIG.

As shown in FIGS. 1 and 2, in the high voltage variable resistor of this embodiment, a holder mounting rib 9 is provided in the high voltage fixed resistor housing portion 3 of the case 1. The holder mounting rib 9 is formed integrally with the case 1 so as to partition the resistor accommodating portion 3 at a predetermined distance from the partition wall 4 in parallel with the partition wall 4.

Then, the high voltage fixed resistor fixing portions 8b, 8b
With the lower part of the high-voltage fixed resistor 11 inserted and fixed in, the case mounting portions 8a, 8a are locked to the upper edges of the holder mounting ribs 9 so that the high-voltage fixed resistor 11 is stored in the high-voltage fixed resistor housing portion 3 It is stored inside. The distance between the holder mounting rib 9 and the partition wall 4 is set so that there is a certain gap between the case mounting portions 8a, 8a and the partition wall 4. The configuration other than the above is the same as that shown in FIGS. 5 to 7 of the conventional example, and the description thereof will be omitted.

In this structure, the creepage distance between the high voltage fixed resistor 11 and the substrate 5 is formed longer by the distance along the surface of the portion surrounded by the partition wall 4 and the holder mounting rib 9, and the high voltage fixed resistor 11 and Since the space distance from the substrate 5 is also longer than that of the conventional one, the insulation between the high voltage fixed resistor 11 and the substrate 5 is significantly improved.

In the above embodiment, the holder mounting rib 9 is provided in parallel with the partition wall 4 so as to connect to the side wall and the bottom wall of the case 1, but as shown in FIG.
4 may be provided only on the portions corresponding to the case attachment portions 8a, 8a, or may be provided so as to be inclined with respect to the partition wall 4, as shown in FIG. Not a thing. In FIG. 4, the high voltage fixed resistor 11
The holder mounting rib 9 is formed so that the side corresponding to the high voltage side (mounting side of the lead terminal 13) of is separated from the partition wall 4 to further improve the insulation between the high voltage fixed resistor 11 and the substrate 5. . Alternatively, the holder mounting rib 9 may be formed separately from the case 1 and attached to the case 1 with an adhesive or the like.

Further, the gap between the case mounting portion and the partition wall is appropriately set so as to obtain a desired insulating property, and it is not always necessary to take this gap.

Appropriate means may be used for fixing the high voltage fixed resistor fixing portions 8b, 8b and the high voltage fixed resistor 11 and the case attachment portions 8a, 8a and the partition wall 4 in the holder 8, for example, an adhesive or the like. You may fix with. of course,
The holder 8 is not limited to the shape shown in FIG.

The present invention can also be applied to a case in which a high-voltage capacitor storage section is provided inside the case, in addition to the board storage section and the high-voltage fixed resistor storage section, and a high-voltage capacitor is stored therein. Further, the high voltage fixed resistor may not have an outer coating.

[0021]

As described above, according to the high voltage variable resistor of the present invention, the holder mounting rib is provided in the high voltage fixed resistor accommodating portion of the case, and the high voltage fixed resistor is attached to the holder mounting rib. By fixing the holder that has fixed, the creepage distance and the spatial distance between the high-voltage fixed resistor and the substrate can be increased. Therefore, the insulation between the high voltage fixed resistor and the substrate can be significantly improved.

[Brief description of drawings]

FIG. 1 is a rear view of a high voltage variable resistor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the main part of the high voltage variable resistor shown in FIG. 1, taken along line XX.

FIG. 3 is a rear view of a high voltage variable resistor according to another embodiment of the present invention.

FIG. 4 is a rear view of a high voltage variable resistor according to another embodiment of the present invention.

FIG. 5 is a rear view of a conventional high voltage variable resistor.

6 is a cross-sectional view of the main part of the high voltage variable resistor shown in FIG. 5, taken along line XX.

FIG. 7 is a perspective view of a holder of the present invention and a conventional holder.

[Explanation of symbols]

 1 Case 2 Board Storage Section 3 High Voltage Fixed Resistor Storage Section 4 Partition Wall 5 Board 6 Resin 7 Lead Terminal 8 Holder 8a Case Mounting Section 8b High Voltage Fixed Resistor Fixed Section 9 Holder Mounting Rib 11 High Voltage Fixed Resistor 12, 13 Lead Terminal

Claims (1)

[Claims] 1. A substrate housing part and a high-voltage fixed resistor housing part are separated from each other by a partition wall in a case having a one-sided opening, and a substrate having a film resistor including a variable resistance part is formed on the substrate housing part. A variable resistor for high voltage, wherein the high voltage fixed resistor is housed in the high voltage fixed resistor housing part by using a holder having a high voltage fixed resistor fixing part and a case mounting part. A holder mounting rib is provided in the resistor accommodating portion at a distance from the partition wall, and a holder in which a high voltage fixing resistor is fixed to the high voltage fixing resistor fixing portion is fixed to the holder mounting rib by the case attaching portion. Accordingly, the high-voltage fixed resistor is housed in the high-voltage fixed resistor housing portion, and the high-voltage variable resistor is characterized.