JP3187395B2 - High-voltage variable resistor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage variable resistor used in combination with a flyback transformer. 2. Description of the Related Art A high-voltage variable resistor combined with a flyback transformer of a television has a circuit board provided with a resistor circuit pattern including a focus resistor and a screen resistor on its surface. The insulating case is housed inside the insulating case, the opening of the insulating case is filled with the insulating resin, and the insulating resin layer is formed on the back side of the circuit board. On the back side of the circuit board of the high-voltage variable resistor, a connection terminal for connection to a flyback transformer and a connection terminal for ground are provided. When combining a high-voltage variable resistor with a flyback transformer, the high-voltage variable resistor is first fitted into a mounting window provided in the flyback transformer case. Then, after making an electrical connection between the flyback transformer and the high-voltage variable resistor, the case of the flyback transformer is filled with mold resin, and the flyback transformer and the high-voltage variable resistor are integrated. In order to facilitate electrical connection between the flyback transformer and the high-voltage variable resistor, it has been proposed to use conductive rubber [JP-A-60-18904.
issue]. [0003] JP-A-60-1890
The electrical connection between the conventional flyback transformer using conductive rubber and the high-voltage variable resistor disclosed in Japanese Patent Publication No. 4 (1999) -2005 is performed by fixing the conductive rubber to the flyback transformer case. In this configuration, a connection terminal protruding from the axial end of the rubber to the back surface of the circuit board of the high-voltage variable resistor is inserted. In this configuration, since the conductive rubber is fixed to the case side of the flyback transformer, a resin for molding the flyback transformer between the case of the flyback transformer and the high-voltage variable resistor is not filled. Therefore, there was a problem in the dielectric strength. A conventional high-voltage variable resistor has a structure in which it is not necessary to connect lead wires before being combined with a flyback transformer, and further, it is not necessary to perform soldering when combined with a flyback transformer. However, the handling of the lead wire in the manufacturing process was troublesome, and the electrical connection with the flyback was troublesome. An object of the present invention is to provide a high-voltage variable resistor which does not require connection of a lead wire until it is combined with a flyback transformer, and which can easily be electrically connected to the flyback transformer. In the high-voltage variable resistor according to the present invention, two operation shafts of the variable resistor protrude from the front surface of the insulating case having an open end. Then, a circuit board having a resistor circuit pattern including a variable resistor on the surface is disposed inside the insulating case. A first lead wire for drawing a focus output to the outside is inserted into one of the four side walls surrounding the opening of the insulating case at a position close to another adjacent side wall. A lead wire insertion portion is provided. Further, a second lead wire insertion portion into which a second lead wire for drawing screen output to the outside is inserted is provided on another side wall portion adjacent to one side wall portion. First and second lead wire holding means for holding the ends of the core wires of the first and second lead wires corresponding to the first and second lead wire insertion portions are arranged inside the insulating case. ing. An insulating resin is filled in the opening of the insulating case, and an insulating resin layer is formed on the back side of the circuit board. An input connection terminal portion in which a cylindrical conductive rubber is fitted into the cylindrical portion is arranged on the back surface side of the circuit board such that the end of the cylindrical portion protrudes from the insulating resin layer. In the present invention, since a structure is adopted in which the core wire of the lead wire for extracting the focus output and the screen output is held by means of the lead wire holding means, until the high-voltage variable resistor is combined with the flyback transformer. There is no need to connect the lead wire to the high voltage variable resistor. Therefore, when forming the insulating resin layer, not only do not need to worry about the lead wire, but also when shipping to the flyback transformer manufacturer, there is no need to worry about the lead wire. When combined with a transformer, there is no need to worry about the leads. for that reason,
Manufacturing, transportation and assembly with the flyback transformer are facilitated. Further, since the input connection terminal portion has a structure in which electrical connection can be made simply by inserting the terminal portion on the flyback side, there is an advantage that electrical connection with the flyback transformer can be easily performed. In addition, no solder is required for input and output connections, making manufacture and assembly much easier. Further, since the conductive rubber for connection is fitted into the cylindrical portion and fixed to the insulating resin layer of the high-voltage variable resistor, there is no need to fix the conductive rubber to the flyback transformer side. Therefore, the high-resistive variable resistor can be combined with the flyback transformer by filling the molding resin of the flyback transformer into the opening of the insulating case, and a decrease in dielectric strength can be prevented even when conductive rubber is used. Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partial sectional view showing an embodiment in which the present invention is applied to a high-voltage variable resistor having a focus output and a screen output used in a part of a flyback transformer of a television. FIG. 2 shows a side view of the resistor of FIG. In these figures, reference numeral 1 denotes an insulating case having an open end formed of an insulating resin material.
Tubular projections 1b1 and 1b2, through which operation shafts 2a and 2b for operating sliders of two variable resistors penetrate, respectively, are protruded from a front wall 1a of the insulating case 1. Since the configuration itself of the variable resistor according to the present embodiment is well known, illustration and description are omitted. A lead wire holding cylinder 3 for holding a lead wire integrally with the insulating case 1 is protruded from one of the side walls 1c in the longitudinal direction of the insulating case 1. Note that a lead wire for drawing a focus output to the outside is inserted into the lead wire holding cylinder 3. A flange 1e is provided around the opening 1d of the insulating case 1. The interior of the insulating case 1 includes a component storage chamber 1g in which a slider (not shown) is stored by a partition wall 1f and a holding piece storage chamber 1 in which a lead wire holding means 4 described later is stored.
h. The partition wall 1f is provided to prevent outside air entering the holding piece storage chamber 1h from entering the component storage chamber 1g and to enhance insulation. As shown in FIG. 2, a second lead wire holding tube 3 'similar to the lead wire holding tube 3 is provided on the side wall portion 1i of the case 1, and this second lead wire holding tube 3' is provided. A lead wire for drawing a screen output to the outside is inserted into the tube 3 ', and a holding piece storage chamber 1h is also provided in the case 1 corresponding to the lead wire holding tube 3'. Although not shown, the lead wire holding means 4 is also housed in the holding piece storage chamber 1h provided corresponding to the lead wire holding cylinder 3 '. The lead wire holding cylinder 3 is provided to enhance insulation when a high voltage is output to the outside as in this embodiment, and is provided especially when the output voltage is low. No need. A through hole is formed inside the lead wire holding cylinder 3, and this through hole has a diameter substantially equal to the outer diameter of the covering cord of the lead wire to be inserted, and one end is provided on the end face side of the lead wire holding tube 3. A large-diameter portion 3a that opens, a tapered portion 3b that extends continuously from the other end of the large-diameter portion 3a, and gradually decreases in diameter in the lead wire insertion direction (the direction of the arrow in the drawing); And one end is case 1
And a small-diameter portion 3c opening to the holding piece storage chamber 1h. The diameter of the small diameter portion 3c is set to be slightly larger than the outer diameter of the end of the core wire of the lead wire (not shown) to be inserted. In this embodiment, the tapered portion 3b and the small diameter portion 3c form a lead wire insertion hole provided in the side wall of the insulating case 1. When the lead wire holding cylinder 3 having such a long length is provided, the lead wire becomes substantially straight while the lead wire is inserted, so that the end of the core wire of the lead wire is shaped into a shape extending in the lead wire insertion direction. You. Further, the tapered portion 3b constituting a part of the lead wire insertion hole effectively acts to guide the end of the core wire of the lead wire to the center position. Even if the lead wire holding cylinder 3 is not provided, if the tapered portion 3b is provided, the end of the core wire of the lead wire can be smoothly inserted into the case. Reference numeral 5 denotes an insulating circuit board provided with a resistor circuit pattern including a focus resistor and a screen resistor on a surface (not shown). The circuit board 5 is the insulating case 1
Are arranged so as to abut on a stepped portion 1j provided on the inner peripheral wall and one end face 1f1 of the partition wall 1f. Circuit board 5
Is generally fixed using a thermosetting adhesive. Particularly, the use of an adhesive for mounting the circuit board 5 is a reason why the electronic component handling a high voltage as in the present embodiment is used for the electronic component handling room 1g.
This is for the purpose of improving the insulation of the device and preventing moisture from entering the interior of the component storage chamber 1g. A space formed by the back surface 5a of the circuit board 5 and the inner peripheral wall of the case 1 is filled with a thermosetting resin to form an insulating resin layer 6. Insulating resin layer 6
Is provided mainly for enhancing insulation. A member indicated by reference numeral 7 protruding from the opening side of the case 1 is a connection terminal portion connected to an electrode (not shown) provided on the back surface 5a side of the substrate 5. The connection terminal portion 7 includes a cylindrical portion 7b having a C-shaped cross section having a cutout portion 7a extending in the axial direction, and a columnar conductive rubber 7c fitted into the cylindrical portion 7b. Conductive rubber 7c
A connection terminal 8 protruding from the back surface 5a side of the substrate 5 is inserted into the substrate. When connecting a connection wire such as a lead wire extending from the flyback transformer to the connection terminal portion 7, the end of the core wire of the lead wire is electrically connected from the axial end face side or the cutout portion 7a side of the cylindrical portion 7b. What is necessary is just to insert in the rubber | gum 7c. By using the connection terminal portion 7 having such a configuration, lead wires can be easily connected. In order to facilitate the insertion of the core of the lead wire, it is preferable to sharpen the tip of the core of the lead wire. A rod-shaped member projecting toward the other end face 1k in the longitudinal direction of the case 1 is a ground connection terminal 9 made of a conductive metal material. 10 is a lead wire holding cylinder 3
Lead wire holding pieces provided on the outer peripheral portion of the case 1 near the side wall portion 1c. The lead wire holding piece 10 holds a lead wire led out from the lead wire holding tube 3 'in order to draw screen output to the outside. The lead wire holding piece 10 is provided with a fitting groove 10a into which the lead wire is fitted. The specific structure of the lead wire holding means stored in the holding piece storage chamber 1h is as shown in FIGS. The pair of holding pieces used in this embodiment are formed integrally by punching and pressing a conductive metal plate mainly made of a rigid material, for example, phosphor bronze. FIG. 3 is a front view of the lead wire holding means 4 having a pair of integrally formed holding pieces, FIG. 4 is a sectional view taken along the line IV-IV of FIG. 3, and FIG. 5 is a plan view. ing. The lead wire holding means 4 has an insertion portion 4a that is inserted into a mounting through hole 5b (FIG. 1) provided in the circuit board 5. As shown in FIG. 3, the insertion portion 4a has a convex shape, and the base portion 4a1 has a mounting through hole 5 provided in the substrate 5.
The bent portion 4a2 is bent toward the back surface 5a of the circuit board 5 in the state of being inserted into the circuit board 5 to prevent the lead wire holding means 4 from being removed (see FIG. 1). The portion indicated by reference numeral 4b in FIG.
a flat portion having a surface 4b1 extending continuously with the surface of the substrate 5 and having a surface 4b1 in contact with the surface of the substrate 5; 11 (see FIG. 1). The flat portion 4b is provided with an upright portion 4c extending substantially perpendicular to the surface of the circuit board 5 continuously. The upright portion 4 c is
Part 4c1 and first part 4c located on the surface side of
1 and a second portion 4c2 made of a pair of rectangular plate members rising from both sides. At the center of the first portion 4c1 of the upright portion 4c, one end of a first holding piece 41 formed by cutting and raising a metal plate is fixed. Also, the second portion 4 of the upright portion 4c
At the end opposite to the first portion 4c1 of c2, as shown in FIG.
d is provided so as to extend in a direction substantially perpendicular to the upright portion 4c. The first holding piece 41 and the second holding piece 42 hold the end of the core wire of the lead wire and hold the lead wire. As shown in FIG. 4, the first holding piece 41 is
It is configured to be pushed by the end 12 of the core of the lead wire indicated by the dashed line and to be inclined in the insertion direction (the direction of the arrow in FIG. 4). FIG. 4 shows the end 12 of the core of the lead wire.
Is a cross-sectional view of a state where the lead wire is inserted to the back, and a state of the first holding piece 41 before the lead wire is inserted to the back is as shown by a two-dot chain line in FIG. The first holding piece 41 includes the upright portion 4
c, a flat plate portion 41a having one end fixed to the first portion 4c1
And a contact portion 41b which is bent from the other end of the flat plate portion 41a in the insertion direction of the lead wire and extends. Also the first
When the lead wire is inserted in the insertion direction, the other end of the holding piece 41, that is, the tip end of the contact portion 41b, makes contact with a part of the outer periphery of the end 12 of the core of the lead wire, and the lead wire is inserted in the insertion direction. An edge portion 41c that cuts into a part of the outer periphery of the lead wire when pulled in the opposite direction is provided. As shown in the plan view of the first holding piece 41 shown in FIG. 6 and the front view of FIG. 3, the contact portion 41b of the first holding piece 41 is inserted in the insertion direction using, for example, a jig having a corner. To form two inclined surfaces 41c1 extending outward to form an edge portion 41c. The second holding piece 42 has a substantially semi-cylindrical shape, and has a tapered end on the side where the lead wire is inserted for smoothly receiving the end 12 of the core wire of the lead wire. A portion 42a is formed. The second holding piece 42 is
The end 12 of the core wire of the lead wire cooperates with the first holding piece 41.
And the electrical connection with the end 12 of the core of the lead wire can be made well. In particular, in the present embodiment, the contact area is increased by forming the second holding piece 42 into a substantially semi-cylindrical shape so that the inner peripheral surface 42b contacts the outer peripheral surface of the core wire of the lead wire as much as possible. Good electrical contact can be obtained. In order to smoothly insert the end portion 12 of the core wire of the lead wire, the inner circumferential surface 4 of the second holding piece 42 is required.
2b is positioned on the extension of the inner peripheral surface of the small diameter portion 3c (FIG. 1) which forms a part of the lead wire insertion hole provided in the wall of the case 1, or is positioned above the extension. It is preferable to arrange them. This is because when the second sandwiching piece 42 is arranged such that the inner peripheral surface 42b of the second sandwiching piece 42 is located considerably below the extension of the inner peripheral face of the small diameter portion 3c of the through hole, the lead wire is This is because the edge 12a of the end portion 12 of the core wire comes into contact with the end surface above the tapered portion 42a of the second holding piece 42, so that the lead wire may not be inserted smoothly. The length L of the second holding piece 42 in the direction in which the lead wire is inserted may be any size as long as the lead wire can be held between the second holding piece 42 and the first holding piece 41. In order to securely hold the end 12 of the core wire of the lead wire, the first holding piece 41 is required.
The second holding piece 4 is moved to a position before the tip of the first holding piece 41 at a position where the first holding piece 41 is inclined at the maximum (the position in FIG. 4).
Preferably, dimension L is determined such that 2 is present. In this embodiment, a fixing means for fixing the second holding piece to the substrate 5 from the insertion portion 4a, the flat plate portion 4b, the upright portion 4c and the like is constituted. The mounting of the lead wire will be described below with reference to FIGS. First, in the initial stage of insertion of the end 12 of the core of the lead wire, first, the edge 12a of the end 12 of the core is inserted.
Contacts the two inclined surfaces 41c1. While the edge 12a of the end 12 of the core wire is in contact with the inclined surface 41c1, the first
The holding piece 41 is pushed by the end 12 of the core wire of the lead wire, and tilts with its tilt angle increasing in the insertion direction about the fixed end. When the end 12 of the core wire of the lead wire is further inserted in the insertion direction, as shown in FIG.
A part of the outer periphery of 2 comes into contact with the edge 41c2 formed at the boundary between the inclined surface 41c1 and the end surface 41b1 of the contact portion 41b. In such a state, the increase of the inclination angle of the first holding piece 41 stops. In this state, the end 12 of the core wire is strongly pressed against the inner peripheral surface 42b of the second holding piece 42 by the spring force of the first holding piece 41 returning to the original direction. After the insertion of the lead wire is stopped, if a force in the direction opposite to the insertion direction, that is, a pulling force is applied to the lead wire for some reason, a spring force for returning to the first holding piece 41 acts. In addition, since the first holding piece 41 has such strength that the first holding piece 41 does not deform unless a predetermined force (for example, about 5 kg) or more is applied, the edge provided at the distal end of the first holding piece 41 The edge 41c2 of the portion 41c cuts into a part of the outer periphery of the end 12 of the core wire of the lead wire to prevent the lead wire from being pulled out. In the above embodiment, the end 1 of the core wire of the lead wire is used.
Before the insertion of the second holding piece 41, the inclination angle of the first holding piece 41 is about 1
It is set to about 0 °. The angle of inclination of the first holding piece 41 is such that when a lead wire is inserted, the end of the core wire of the lead wire smoothly enters between the first holding piece 41 and the second holding piece 42 and the end of the core wire. Any angle may be used as long as it can be inclined in the insertion direction while being in contact with the outer periphery of the portion 12. In the above embodiment, the configuration is adopted in which the lead wire holding means 4 does not contact the case 1 at all.
Even when a high voltage is output, it is possible to prevent such a disadvantage that a current leaks through the case 1. In addition, since the lead wire holding means 4 is integrally formed of a conductive metal plate, there is an advantage that mounting is easy and mechanical strength is strong. Further, the lead wire holding cylinder 3 and the partition wall 1
Since f is provided, sufficient insulation can be obtained even when a high voltage is output. [Modification of Embodiment] In the above embodiment, the pair of holding pieces are integrally formed. However, the first holding piece 41 is formed separately from the second holding piece 42, and each piece is individually formed. You may make it fix. When the first holding piece 41 is formed separately, the first holding piece 41 may of course be formed of an insulating material. When the first holding piece 41 is separately formed and fixed, when the output voltage is low, the fixed side end of the holding piece may be fixed to the inner surface of the case 1 as a matter of course. In the above embodiment, the lead wire holding means 4 is configured so that the second holding piece 42 is located on the case 1 side and the first holding piece 41 is located on the substrate 5 side. ,
The positional relationship between the second holding piece 42 and the first holding piece 41 may be reversed, and the second holding piece 42 and the first holding piece 4
1 may of course be arranged so as to oppose in the lateral direction. In the above embodiment, the shape of the first holding piece 41 is substantially rectangular, the shape of the edge 41c2 of the edge portion 41c is an isosceles triangle, and the contact surface 41c1 is a shape having two surfaces. However, the shape of the edge portion 41c provided at the distal end portion (the other end) of the first holding piece 41 is such that the outer periphery of the end portion of the core wire of the lead wire smoothly contacts and the lead wire is drawn in the direction opposite to the insertion direction. Any shape may be used as long as it penetrates the outer periphery of the core wire of the lead wire.
For example, the shape of the edge 41c2 may be a substantially semicircular shape like the shape of the inner peripheral surface of the second holding piece 42, or may be a polyhedral shape. The shape of the second holding piece 42 may be any shape as long as a sufficient contact area can be obtained. For example, it goes without saying that the cross-sectional shape may be of a V-shape or a multi-faced shape. Further, as shown in FIG. 8, if the rear end of the second holding piece 42 in the insertion direction is inclined toward the substrate 5, the end of the core of the lead wire can be held more strongly. As shown in FIG. 1, since the above embodiment outputs a high voltage, the lead wire holding means 4 is fixed at a position distant from the inner wall of the case, but a relatively low voltage is output. When the lead wire holding means 4 is
Can be arranged in close proximity to the inner wall. With this configuration, even when a strong pulling force is applied to the lead wire, the holding means can be brought into contact with the inner wall surface of the case 1, and the holding means can be prevented from tilting. In the above embodiment, only one of the holding pieces is configured to be tiltable, and the edge is provided on the tilting holding piece. However, as shown in FIG. 9, the first and second holding pieces are provided. Both the pieces 41 and 42 may be configured so as to be inclined by being pushed by the end of the lead wire to be inserted, and an edge may be provided at the tip of each holding piece. If all the holding pieces can be inclined in this way and the edge portion is provided at the tip of each holding piece, the lead wire can be more securely prevented from coming off. In the above embodiment, two holding pieces are used, but the number of holding pieces is not limited to two, and as shown in FIG. 10, three or more holding pieces 41 ',
Of course, 42 'and 43' may be arranged at equal intervals around the core of the lead wire so as to sandwich the end of the core wire of the lead wire. It is to be noted that which of the plurality of holding pieces is electrically connected to the electrode of the circuit board 5 is optional. Also, according to the magnitude of the voltage or current output from the lead wire, all or a part of the holding piece may be fixed to the case. According to the high-voltage variable resistor of the present invention, in addition to using conductive rubber for electrical connection with the flyback transformer, an output lead wire can be connected in the final step of assembly. In addition to assembling the high-voltage variable resistor, the work of combining the high-voltage variable resistor and the flyback transformer becomes easy. In addition, since a lead wire of an appropriate length can be attached according to the model, the versatility of the high-voltage variable resistor can be enhanced. In particular, according to the present invention, since the conductive rubber for connection is fitted into the cylindrical portion and fixed to the insulating resin layer of the high-voltage variable resistor, the conductive rubber is fixed to the flyback transformer side. There is no need to fill the opening of the insulating case with the mold resin of the flyback transformer, so that the high-voltage variable resistor can be combined with the flyback transformer. Further, according to the present invention, the cut-out portion in which the connection line extending in the axial direction of the tubular portion and extending from the flyback transformer side is inserted is provided in the tubular portion into which the conductive rubber is fitted. Even after combining with a high-voltage variable resistor, you can easily insert the connection wire extending from the flyback transformer side into the conductive rubber by inserting your finger through the mold resin filling opening of the flyback transformer case, There is an advantage that the flyback transformer can be easily assembled. According to the present invention, the conductive rubber for connection is fitted into the cylindrical portion and fixed to the insulating resin layer of the high-voltage variable resistor. There is no need to fix to the side. Therefore, it is possible to combine the flyback transformer with the high-voltage variable resistor by filling the molding resin of the flyback transformer into the opening of the insulating case, and to prevent a decrease in the dielectric strength even when conductive rubber is used. There is. In particular, when the end portion of the connecting portion having the conductive rubber fitted in the cylindrical portion is arranged on the back side of the circuit board so as to protrude from the insulating resin layer, the connecting terminal portion is fitted inside the cylindrical portion. Since the end face of the conductive rubber is not covered with the insulating resin for forming the insulating resin, it is possible to prevent the terminal inserted from the flyback transformer from being unable to be inserted into the conductive rubber. In particular, according to the high-voltage variable resistor of the present invention,
In addition to using conductive rubber for electrical connection to the flyback transformer, output lead wires can be connected in the final step of assembly, so high-voltage variable resistors can be assembled, as well as high-voltage variable resistors. The work of combining the variable resistor and the flyback transformer becomes easy.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial sectional view of one embodiment of a high-voltage variable resistor according to the present invention. FIG. 2 is a side view of the variable resistor in FIG. 1; FIG. 3 is a front view of a lead wire holding means used in the embodiment of FIG. 1; FIG. 4 is a sectional view taken along line IV-IV of FIG. 3; FIG. 5 is a plan view of the lead wire holding means of FIG. 3; FIG. 6 is a plan view of a first holding piece. FIG. 7 is an explanatory diagram showing a relationship between an end of a core of a lead wire and an edge of a first holding piece. FIG. 8 is a sectional view showing a modification of the second holding piece. FIG. 9 is a sectional view showing another embodiment of the lead wire holding means. FIG. 10 is an explanatory view showing still another embodiment of the lead wire holding means. [Description of Signs] 1 Insulating cases 3, 3 'Lead wire holding cylinder 3b Tapered portion 3c Small diameter portion 4 Lead wire holding means 5 Circuit board 6 Insulating resin layer 7 Connection terminal portion 7a Notch portion 7b Tube portion 7c Conductive rubber 8 Connection Terminal 12 End 41 of Core of Lead Wire First Holding Piece 41c Edge 42 Second Holding Piece

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 56-86768 (JP, U) Japanese Utility Model Showa 58-120607 (JP, U) Japanese Utility Model Showa 60-59501 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) H01C 13/00 H01F 19/04

Claims (1)

(57) [Claims] Two operating shafts of the variable resistor protrude from the front surface of the insulating case having an opening at one end, and a circuit board provided with a resistor circuit pattern including a variable resistor on the surface is disposed inside the insulating case; A first lead wire is inserted into one of the four side wall portions surrounding the opening of the case at a position near another adjacent side wall portion to draw a focus output to the outside. An insertion portion is provided; a second lead wire insertion portion into which a second lead wire for drawing a screen output to the outside is inserted is provided on the other side wall portion adjacent to the one side wall portion; Inside, are disposed first and second lead wire holding means for holding the ends of the core wires of the first and second lead wires corresponding to the first and second lead wire insertion portions, Insulating resin in the opening of the insulating case An insulating resin layer is formed on the back side of the circuit board, and an input connection terminal portion in which a cylindrical conductive rubber is inserted into a cylindrical portion, and an end portion of the cylindrical portion is the insulating resin. A high-voltage variable resistor, which is disposed on the back side of the circuit board so as to protrude from the layer. 2. 2. The high voltage device according to claim 1, wherein the first and second lead wire holding means are formed by processing a conductive metal plate and have a plurality of holding pieces for holding the core of the lead wire. 3. Variable resistor.