JPH11297516A - Variable resistor for high voltage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable inexpensive variable resistor for high voltage capable of being miniaturized. SOLUTION: In a variable resistor for high voltage, an insulating substrate 2 composed of alumina, etc., is stuck and fixed to an insulating case 1 which has an opening on its back and rotating shafts 4 and 4, respectively fitted with sliders 5 at their front ends are supported by cylindrical bearing sections 1a and 1a provided to the front end section of the case 1. The insulating substrate 2 has through-holes 25 and 25 at the portions corresponding to the axial centers of the shafts 4 and 4, and output lines 8 and 8 coated with insulators are passed through the through-holes 25 and 25. In addition, the core wires of the lines 8 and 8 are directly connected to the corresponding sliders 5.

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 adjusting a focus voltage, a screen voltage and the like of a television receiver or the like.

[0002]

2. Description of the Related Art Conventionally, as this kind of high-voltage fixed resistor,
For example, there is a structure as shown in FIGS.
As shown in FIG. 3, the high-voltage fixed resistor is provided with an insulating substrate 2 made of a ceramic such as alumina adhered and fixed to an insulating case 1 made of synthetic resin having a one-sided opening and provided on the bottom side of the insulating case 1. The rotating shafts 4 and 4 on which the sliders 5 are mounted are bearings on the cylindrical bearing portions 1a and 1a, respectively, and the insulating substrate 2 is provided in an isolation wall 1b provided at an inner corner of the insulating case 1.
The conductive rubber 6 which is in contact with the output electrode formed on the surface (the lower surface in FIG. 3) and the connection terminal 7 inserted into the conductive rubber 6 are housed and fixed. The resin 3 is filled on the back surface (the top surface in FIG. 3) of the insulating substrate 2.

As shown in FIG. 4, output electrodes 21 and 21, a high voltage input terminal electrode 22 to which a high voltage is input (applied), and a ground terminal electrode 24 are formed on the surface of the insulating substrate 2. A film resistor 23 having a required pattern and having two semi-circular variable resistance portions between the input terminal electrode 22 and the ground terminal electrode 24 is formed. One end of each slider 5 is arranged so as to press and contact the collector of the output electrode 21, and the other end is arranged to slide on the variable resistor of the film resistor 23.

[0004] Two output line holding cylinders 1c are formed on the side wall portion of the insulating case 1, and the output lines 8 provided with insulating coating for extracting a focus voltage or a screen voltage are inserted into the output line holding cylinder 1c. The output wire 8 has its core wire 8a clamped by a clamping piece provided on the connection terminal 7 so that the connection terminal 7
It is connected to the.

Although not shown, lead terminals or lead wires for grounding, high voltage input and grounding are connected to the input terminal electrode 22 and the ground terminal electrode 24 by soldering or conductive rubber. The insulating case 1 is drawn out from the opening side.

[0006]

However, in the above-mentioned conventional high-voltage fixed resistor, the slider and the output line are electrically connected via the output electrode, the conductive rubber, and the connection terminal. There is a problem that the connection becomes complicated and the reliability of the connection decreases.

Further, it is necessary to form an output electrode on the insulating substrate, and it is difficult to obtain a desired withstand voltage between the film resistor and the output electrode, and there is a limit to downsizing. In addition, output line holding part and isolation wall (connection part storage part)
However, there is a problem that an insulating case having a complicated structure such as the provision of such an element is required, so that the manufacturing cost of the insulating case is increased, and the external dimensions are large, so that miniaturization is difficult.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive and highly reliable high-voltage variable resistor that can be reduced in size by reducing the number of connection points without forming an output electrode. is there.

[0009]

In order to achieve the above object, according to the first aspect of the present invention, there is provided an insulating case having an open surface on one side and a film resistor including a variable resistance portion formed on the surface. An insulating substrate housed in an insulating case, a rotating shaft mounted on the insulating case with a slider sliding on the variable resistance portion of the film resistor, and outputting a high voltage from the slider; A high-voltage variable resistor comprising: an output line connected to a connection member attached to the slider or the rotating shaft and connected to the slider, and inserted through the insulating substrate. And drawn out from the back side of the insulating substrate.

According to a second aspect of the present invention, there is provided an insulating case having a one-sided opening, a film resistor including a variable resistance portion formed on the surface thereof, an insulating substrate housed in the insulating case, and a variable resistor of the film resistor. A high-voltage variable resistor comprising a rotating shaft mounted with a slider that slides on a part and bearing the insulating case, and an output line that outputs a high voltage from the slider. A part of the slider or a part of the connection member is inserted through the insulating substrate, pulled out from the back side of the insulating substrate, and the output line is drawn from the insulating substrate of the slider or the connecting member. Is connected to the terminal.

According to a third aspect of the present invention, in the high-voltage variable resistor according to the first or second aspect, an output line holding piece is provided at a connection portion of the slider or the connection member with an output line. And the output line is connected by being sandwiched between the output line holding pieces.

According to the above configuration, the output line is connected to the slider or the connection member attached to the rotary shaft, so that the number of connection points can be reduced and the reliability of the connection can be improved. .

Further, it is not necessary to provide an output electrode on the insulating substrate, so that the pressure resistance can be improved, the degree of freedom in designing the film resistor pattern can be increased, and the output connection can be made to the insulating case. There is no need to provide a component storage section, the shape of the insulating case can be simplified, and the size of the insulating substrate and the insulating case can be reduced.

Further, by pulling out a part of the slider or a part of the connecting member to the back side of the insulating substrate and connecting an output line to the part drawn out to the back side of the insulating substrate, a high voltage can be obtained. The output line can be connected after assembling the main part of the variable resistor for use or after filling with resin.

Further, by forming the output line holding piece on the slider or the connecting member, the output line can be connected to the slider or the connecting member without soldering. In other words, the high-voltage fixed resistor can be assembled without reducing the number of soldered portions or without any soldering, and assembling is facilitated, and lead-free and chlorofluorocarbon can be eliminated.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings showing embodiments thereof. 1 and 2 show the structure of a high-voltage fixed resistor according to one embodiment of the present invention. FIG. 1 is a sectional view of a high-voltage fixed resistor, and FIG. 2 is a plan view showing a surface of an insulating substrate. In the high-voltage fixed resistor according to the present embodiment, as shown in FIG. 1, an insulating substrate 2 made of alumina or the like is bonded and fixed to a step provided on the inner peripheral surface of an insulating case 1 having a back opening.
Cylindrical bearing 1 provided on the front surface of insulating case 1
Rotation shafts 4 and 4 having a slider 5 attached to the tip are mounted on a and 1a. The rotating shafts 4 and 4
Through holes 25, 25 are formed in portions corresponding to the axis of
In the through holes 25, 25, the output lines 8, 8 coated with insulation are provided.
Are inserted, and the core wire 8a of each output line 8 is
Directly connected to An epoxy-based resin 3 is filled on the back surface (upper surface in FIG. 1) of the insulating substrate 2.

As shown in FIG. 2, an input terminal electrode 22 to which a high voltage is input (applied) and a ground terminal electrode 24 are formed on the surface (the lower surface in FIG. 1) of the insulating substrate 2. Film resistor 2 of required pattern having two semi-circular variable resistance portions between electrode 22 and ground terminal electrode 24
3 are formed, and a through hole 25 is formed at a portion corresponding to the center of the arc of the variable resistance portion.

The tip of each slider 5 is arranged so as to slide on the variable resistance portion of the film resistor 23, and a plurality of output lines are clamped at the mounting portion of each slider 5 to the rotating shaft 4. The piece 5a is formed integrally, and the core wire 8a of the output wire 8 and the slider 5 are connected to each other by contact and conduction by the spring pressure of the output wire holding piece 5a. A focus voltage and a screen voltage are output from these output lines 8.

Although not shown, an O-ring or the like is attached to a portion where the output line 8 passes through the through hole 25 in order to prevent the resin 3 from entering the inside.

In the configuration of the present embodiment, the output line 8 is connected to the slider 5 attached to the rotating shaft 4, so that the output electrodes and the like are unnecessary, and the number of connection points can be reduced. The reliability has been improved.

Further, it is not necessary to provide an output electrode on the insulating substrate 2, and the withstand voltage can be improved. Further, the pattern of the film resistor 23 can be arranged without considering the distance from the output electrode pattern.
The degree of freedom in designing the pattern can be increased, and the size can be reduced. In addition, there is no need to provide a connecting part housing for output or the like in the insulating case 1, so that the shape of the insulating case 1 can be simplified, and the size can be reduced together with the insulating substrate 2.

Further, since the output wire holding piece 5a is formed integrally with the slider 5, and the output wire 8 is inserted into the slider 5 and connected without soldering, the number of soldering points can be reduced. , Assembly (connection of the output line 8) becomes easy. If other connection points are connected without soldering by spring contact or conductive rubber, all connection points can be connected without solder.

In the above embodiment, the slide 5 is provided with the output line holding piece 5a. However, the output line 8 may be connected to the slide 5 by soldering.

Further, a connecting member made of a thin metal plate separate from the slider that is electrically connected to the slider may be attached to the tip of the rotating shaft, and the output line may be connected to this connecting member. In this case, a structure is adopted in which the connection member and the slider are pressed and brought into contact with each other to conduct electricity, and the output line does not rotate even when the rotating shaft is rotated. Also, in this case, the output member may be provided with the output line sandwiching piece and the output line and the slider may be connected without soldering in the same manner as in the above embodiment, or may be connected by soldering. Is also good.

Also, the leading end of the slider or one end of the connecting member is drawn out to the back side of the insulating substrate, and the output line is connected to the portion drawn out to the back side of the insulating substrate. Is also good. With this configuration, the output line can be connected after the main part of the high-voltage variable resistor is assembled or after resin is filled. That is, the output line can be connected when assembling to a flyback transformer or the like.

[0026]

As described above, according to the high-voltage variable resistor according to the present invention, since the output line is connected to the slider or the connecting member mounted on the rotating shaft, the number of connection points is reduced. And the reliability of the connection can be improved.

Further, it is not necessary to provide an output electrode on the insulating substrate, so that the pressure resistance can be improved and the degree of freedom in designing the film resistor pattern can be increased.
There is no need to provide an output connection component storage section in the insulating case, the shape of the insulating case can be simplified, and the size of the insulating substrate and the insulating case can be reduced.

Further, if a structure is adopted in which a part of the slider or the connecting member is drawn out to the back side of the insulating substrate and the output line is connected to the part drawn out to the back side of the insulating substrate, The output line can be connected after the main part of the variable resistor is assembled or filled with resin.

Further, by forming the output line holding piece on the slider or the connecting member, the high voltage fixed resistor can be assembled without reducing the soldering portion or without any soldering, and the assembly becomes easy. , De-leading,
It is also possible to achieve CFC removal.

Therefore, according to the present invention, it is possible to provide an inexpensive, compact, and highly reliable high-voltage variable resistor.

[Brief description of the drawings]

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

FIG. 2 is a plan view of an insulating substrate of the high-voltage variable resistor according to one embodiment of the present invention.

FIG. 3 is a sectional view of a conventional high-voltage variable resistor.

FIG. 4 is a plan view of an insulating substrate of a conventional high-voltage variable resistor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulating case 2 Insulating board 25 Through-hole 3 Resin 4 Rotating shaft 5 Slider 5a Output line holding piece 8 Output line 8a Core wire

Claims (3)

[Claims] 1. An insulating case having an open surface on one side, a film resistor including a variable resistance portion formed on a surface thereof, an insulating substrate housed in the insulating case, and sliding on the variable resistance portion of the film resistor. A high-voltage variable resistor comprising a rotating shaft having a slider mounted thereon and bearing on the insulating case, and an output line for outputting a high voltage from the slider; A high-voltage variable resistor, which is connected to a connection member connected to the slider or the rotating shaft and is electrically connected to the slider, and is drawn out from the back side of the insulating substrate through the insulating substrate. . 2. An insulating case having an open surface on one side, a film resistor including a variable resistance portion formed on the surface thereof, an insulating substrate housed in the insulating case, and sliding on the variable resistance portion of the film resistor. A high-voltage variable resistor comprising a rotating shaft having a slider mounted thereon and bearing on the insulating case, and an output line for outputting a high voltage from the slider, wherein a part of the slider Alternatively, a part of the connection member may be inserted through the insulating substrate, pulled out from the back side of the insulating substrate, and the output line may be connected to the slider or a portion of the connecting member drawn out from the insulating substrate. Variable resistor for high voltage characterized by the following. 3. An output line holding piece is formed at a connection portion of the slider or the connection member with an output line, and the output line is connected by being held by the output line holding piece. The variable resistor for high voltage according to claim 1 or 2, wherein