JP3150925B2 - High-voltage variable resistor - Google Patents

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 constructed by combining a variable resistor unit and an electronic component unit.

[0002]

2. Description of the Related Art As disclosed in Japanese Utility Model Publication No. 3-56002, a conventional high-voltage variable resistor constructed by combining a variable resistor unit and an electronic component unit is disclosed in
A connection terminal is provided on the back side of the variable resistor unit, and a lead wire of an electronic component housed in the electronic component unit is soldered to the connection terminal. Then, a case of the electronic component unit and a case of the variable resistor unit are fitted. I agree.

[0003]

When the space between the electronic component unit and the variable resistor unit is filled with an insulating resin in order to increase the withstand voltage, the electronic components arranged in the electronic component unit are surrounded by an insulating resin. There is a problem that the insulating resin cured by the above applies a stress that may damage the electronic component.

[0004]

A high-voltage variable resistor to be improved by the present invention is constituted by combining a variable resistor unit and an electronic component unit. The variable resistor unit is housed in a resistor case made of an insulating resin having an opening at one end with an insulating substrate having a resistance circuit including a variable resistor formed on the front surface with the back surface facing the opening. A connection terminal is fixed to the back surface of the resistor case, and a fitting portion is provided around the opening of the resistor case. Electronic component unit
An electronic component case made of an insulating resin having a fitting portion around which the fitting portion of the resistor case is fitted around the opening portion, wherein the electronic component connected to the resistance circuit and the connection terminal are connected. Has terminals. Then, an insulating resin is filled in a space formed between the fitted variable resistor unit and the electronic component unit.

In the present invention, the resistor case and the electronic component case are each formed so as to form an insulating resin filling port for filling the insulating resin at one end face in the fitted state. And inside the electronic component case, there are provided a plurality of component storage portions partially surrounded by a plurality of ribs extending from the bottom wall portion toward the opening. A pair of leads
An electronic component with low mechanical strength extending in the opposite direction
A pair of leads extend in a direction perpendicular to the direction in which
As described above. The rib surrounding the component storage portion for storing the electronic component having low mechanical strength is formed so as to balance the thickness of the insulating resin layer around the electronic component, that is, is formed between the rib and the electronic component. Insulating resin
The thickness of the layer reduces the difference in stress applied to the electronic component from both sides
Provided to be.

According to the present invention, the plurality of ribs partially surrounding the component storage portion are formed so as to balance the thickness of the insulating resin layer around the electronic component stored in the component storage portion (causing uneven wall thickness). Because of this, it is possible to prevent a stress that may damage the electronic component from the cured insulating resin to the electronic component disposed in the electronic component unit. In particular, according to the present invention, the mechanical strength is weak.
Large stress is not applied to the lead wire extension
Therefore, when housing electronic components having low mechanical strength, such as a ceramic capacitor with a lead wire , a great effect is exhibited.

In such a high-voltage variable resistor, more specifically, a terminal fitting having an insertion portion at the tip of the connection portion is used as a connection terminal of the variable resistor unit. In addition, as a connected terminal of the electronic component unit, a conductive rubber terminal that is held by a terminal holding portion provided on a bottom wall portion of the electronic component case and into which an insertion portion of a terminal fitting is inserted is used. Then, a resin filling space for filling the insulating resin is provided between the conductive rubber terminal and the bottom wall.

[0008] By simply inserting the insertion portion of the terminal fitting provided as a connection terminal in the variable resistor unit into the conductive rubber terminal provided as a connected terminal in the electronic component unit, the connection between the variable resistor unit and the electronic component unit can be made. Electrical connection can be reliably performed. Therefore, the number of soldering points can be reduced, and the occurrence of connection failure can be suppressed. In addition, since a resin-filled space filled with an insulating resin is provided between the conductive rubber terminal and the bottom wall, the insulating resin filled in the resin-filled space enhances the external withstand voltage characteristics of the conductive rubber terminal. . In other words, even if the bottom wall of the electronic component case is cracked for some reason, the occurrence of external discharge such that the insulating resin between the conductive rubber terminal and the bottom wall reaches the conductive rubber terminal is prevented. .

In the present invention, since the electrical connection between the variable resistor unit and the electronic component unit is intended, other terminals such as an input terminal, an output terminal, and a ground terminal are not particularly specified. Further, the variable resistor unit may be one in which an insulating resin is previously filled on the back surface of the insulating substrate having the variable resistor, and in addition to the insulating substrate having the variable resistor, an insulating substrate having a fixed resistor and , A fixed resistor, and other attached electronic components such as a capacitor. Further, the electronic components housed in the electronic component unit are not limited to specific components.

[0010] A projection projecting from the bottom wall is provided in the terminal holding portion so as not to obstruct the inflow of the insulating resin. The number and shape of the projections are arbitrary.

By providing the projection on the bottom wall in the terminal holding portion, a predetermined insulating resin filling space can be reliably formed between the bottom surface of the conductive rubber terminal and the bottom wall of the electronic component case. .

The terminal holding portion is constituted by a wall extending from the bottom wall to the opening so as to surround the periphery of the conductive rubber terminal, and a slit extending from the bottom wall toward the opening in the wall. To form Then, the end of the lead wire of the predetermined electronic component is extended to the back side of the conductive rubber terminal through the slit, and inserted into the conductive rubber terminal. This slit
In addition to passing the lead wires, if the resin is guided to the resin-filled space between the conductive rubber terminal and the bottom wall of the electronic component case, the structure of the terminal holding portion is simplified.

If the lead wire of the electronic component is inserted from the back side of the conductive rubber terminal through a slit provided in the terminal holding portion, the structure is such that the end of the lead wire does not easily come off the conductive rubber terminal. Therefore, when combining the variable resistor unit and the electronic component unit, even if external force is applied to the electronic component or the lead wire, it is possible to prevent the lead wire of the electronic component inserted in the conductive rubber terminal from coming off it can.
In particular, when the slit is formed not only to allow the lead wire to pass but also to allow the insulating resin to be introduced into the terminal holding portion, the structure of the terminal holding portion can be simplified.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 (A), 1 (B) and 1 (C) show a rear view, a side view and a front view of an embodiment of a high-voltage variable resistor according to the present invention, and FIGS. 2 (A) and 2 (B). 3 shows bottom views of the variable resistor unit 1 and the electronic component unit 30 shown in FIG. In these figures, a variable resistor unit 1 includes an insulating substrate 3 having a resistance circuit including a variable resistor formed on a front surface in a resistor case 2 made of an insulating resin having an opening at one end.
It is stored facing the side. A fitting portion 5 is provided around the opening 4 of the resistor case 2 so as to remove a side of a portion forming an insulating resin filling port when combined with the electronic component unit 30.

On the side where the fitting portion 5 is not provided, a flat plate portion 7 for mounting terminals is provided, and the flat plate portion 7 is provided with three terminal mounting portions 8, 9 and 10 protruding therefrom. . The terminal attachment portions 8 and 9 are provided with terminal fittings 11 and 12 for grounding.
The terminal fittings 11 and 12 are fixed by projecting in a direction away from the flat plate portion 7, and a welding portion provided at the end thereof is welded. Terminal fitting 11
And 12 are disposed so as to penetrate the insulating substrate 3, and the ends are connected by soldering to electrodes provided on the surface of the insulating substrate 3. A terminal fitting 13 for reinforcement is attached to the terminal attaching section 10. The reinforcing terminal fittings 13 are electrically meaningless and are provided for the purpose of increasing the mounting strength when mounting a heavy high-voltage variable resistor on a circuit board. Note that a terminal fitting having the same structure as that of the terminal fitting 13 is used as an electrical terminal in an electronic component unit 30 to be described later, and will be described later in detail.

A pin terminal 14 is provided on a side wall of the resistor case 2 opposite to the side on which the flat plate portion 7 is provided.
Three cylindrical portions 17 to 19 for projecting to 16 are protruded. The bases of the tubular portions 17 to 19 have a prismatic shape. The pin terminal 14 constitutes a first output terminal, the pin terminal 15 constitutes an input terminal, and the pin terminal 16 constitutes a second output terminal. The ends of the pin terminals 14 to 16 inserted into the resistor case 2 are soldered to terminal fittings 20 to 22 fixed to the back surface of the insulating substrate 3.

The terminal fittings 20 to 22 have the structure shown in FIG. Since these terminal fittings have the same structure, the structure will be described using one terminal fitting 20 as an example. The terminal fitting 20 includes a flat plate portion 20a in contact with the back surface of the insulating substrate 3, a connection terminal portion 20b extending from one end of the flat plate portion 20a in a direction orthogonal to the flat plate portion, and a connection terminal portion 20b from the other end of the flat plate portion 20a. And a connecting portion 20c extending to the opposite side. A through window 20 is provided at the center of the connection portion 20c.
d is formed, and a sharp insertion portion 20e having a shape that becomes narrower toward the front end is provided at the front end. Among these terminal fittings, terminal fittings 20 and 22
Constitutes a connection terminal inserted into the conductive rubber terminal on the electronic component unit 30 side. The terminal fittings 21 are not particularly connected to the connected terminals on the electronic component unit side, but the same ones as the terminal fittings 20 and 22 are used for the purpose of reducing the types of components. The terminal fitting 24 fixed to the center of the back surface of the insulating substrate 3 also has the same structure as the terminal fitting 20. Like the terminal fittings 20 and 22, the terminal fitting 24 constitutes a connection terminal inserted into the conductive rubber terminal T2 on the electronic component unit 30 side.

The electronic component unit 30 includes the resistor case 2
And an electronic component case 31 made of insulating resin which constitutes a case of the high-voltage variable resistor in combination with the electronic component case 31. The electronic component case 31 has openings 32 and 33 on one surface forming an insulating resin filling port in a state combined with the resistor case 2 and on one surface facing the opening 4 of the resistor case 2.
have. Double walls 34 and 35 are provided around the opening 33, and the fitting portion 5 of the resistor case 2 is fitted between the two walls 34 and 35. A recess 36 is formed. Snap-in type locking pieces 37 and 38 are integrally provided on the outer wall portion of the wall portion 34 near the opening 32 side, and also on the outer wall portion of the bottom wall portion 40 of the electronic component case 31. A snap-in type locking piece 39 is provided integrally.
These locking pieces 37 to 39 engage with locking portions provided on the circuit board side when the high-voltage variable resistor is mounted on a circuit board (not shown).

The bottom wall portion 40 of the electronic component case 31 has an uneven shape because capacitor storage portions 42 to 44 described later protrude. Specifically, it has a terminal mounting plate portion 41 most protruding (lowest) at a position near the opening 32 forming the insulating resin filling port. The terminal mounting plate portion 41 has a two-stage configuration of two flat plate portions 41a and 41b. And in the middle position of the bottom wall part 40,
It has protruding portions 45 to 47 constituting the three capacitor housing portions 42 to 44. Further, a flat portion 48 having the least amount of protrusion is provided in a portion further than the intermediate position.

Around the capacitor accommodating portion 42 for accommodating the capacitor C1, there are provided upstanding wall portions or ribs 49 to 51 extending from the inner surface of the bottom wall portion 40 toward the opening portion 33. The rib 49 is connected to the wall 35 provided around the opening 33, and has a gap G1 for resin distribution between the rib 49 and the side surface of the rib 51. The rib 50 is the rib 5
1 and a gap G for resin distribution between the wall and the wall 35.
Two. Note that the ribs 49 to 51 are
In addition to the function of preventing the movement of the capacitor C1, the capacitor also has a function of balancing the thickness of the insulating resin layer around the capacitor C1, that is, preventing uneven thickness of the surrounding insulating resin layer. If such ribs are not provided, the stress applied to the capacitor C1 from the insulating resin layer will be unbalanced due to the difference in the thickness of each part of the insulating resin layer surrounding the periphery of the capacitor C1, and the imbalance of this stress will occur. The balance may damage the capacitor C1. When the ribs are provided as in this embodiment, the thickness of the insulating resin layer on both sides (left, right, up, down, front and back) of each part of the electronic component can be balanced, and the difference in stress applied to the electronic component from both sides can be reduced. Can be reduced.

The rib 51 extends upright from the flat plate portion 48 of the bottom wall portion 40 and opens toward the opening portion 33.
It has two concave portions 52 to 54. The recess 52 houses the diode D, the recess 53 houses the bent portion of the lead wire, and the recess 54 houses the conductive rubber terminal T2. Slits S1 and S2 for passing the lead wire of the diode D are formed on both sides in the longitudinal direction of the recess 52, and a slit S3 for passing the lead wire is formed between the recess 54 and the recess 53. . The recess 54
The fitting structure between the wire and the conductive rubber terminal T2 and the internal structure of the concave portion 54 will be described later in detail.

The ribs 51 and 55 described above are provided on both sides in the width direction of the capacitor housing portion 43 for housing the cylindrical capacitor C2. A rib 56 extending from the flat plate portion 41b and terminating at a position slightly closer to the opening 33 than the bottom surface of the capacitor housing 43 is provided at a position on the opening 32 side of the capacitor housing 43. I have. The upper end of the rib 56 is curved so as to open toward the opening 33. The rib 56 functions as a capacitor supporting means when a long capacitor is used as the cylindrical capacitor C2. 57 is a lead wire locking portion.

Ribs 58 and 59 are provided on both sides in the longitudinal direction of the capacitor accommodating portion 44 formed between the rib 55 and the wall portion 35 and accommodating the capacitor C3. And the ribs 55 to form gaps G3 and G4. Note that the rib 58 is the same as the rib 49 described above.
Similarly to the above, in addition to the function of preventing the movement of the capacitor C3, the capacitor C3 has a function of preventing the thickness of the surrounding insulating resin layer from being uneven.

A flat plate portion 48 formed at a position apart from the insulating resin filling port of the bottom wall portion 40 has two
Two ribs 60 and 61 are provided. The ribs 60 and 61 are formed with concave portions 62 and 63 for fitting the conductive rubber terminals T1 and T3, and slits S4 and S5 for opening the concave portions 62 and 63 to the insulating resin filling port side and passing lead wires. Have been. Conductive rubber terminals T1
T3 constitutes a connected terminal connected to the terminal fittings 20, 22, and 24 constituting the connection terminal of the variable resistor unit 1. Terminal fittings 20, 22, and 24 and conductive rubber terminal T
1 to T3 are the same, and the internal structures of the recesses 54, 62 and 63 for accommodating the conductive rubber terminals T1 to T3 are the same.
This will be described with reference to FIG.

FIG. 5A is an enlarged plan view of the concave portion 63 in which the conductive rubber terminal T3 is fitted, and FIG. 5B shows a state in which the insertion portion 20e of the terminal fitting 20 is inserted into the conductive rubber terminal T3. It is an expanded sectional view. Inside the recess 63, four columnar projections 64a to 64d projecting from the flat plate portion 48 of the bottom wall portion 40 toward the opening 33 are provided in a projecting manner. These protrusions are provided between the conductive rubber terminal T3 and the bottom wall 40.
Is provided to form a resin filling space 65 between the flat portion 48 and the flat portion 48. Each of the protrusions 64a to 64d is provided so as to allow the lead wire L of the capacitor C3 inserted through the slit S5 to enter, and not to obstruct the inflow of the insulating resin through the slit S5. Note that the lead wire L may be inserted from the back side of the conductive rubber terminal T3 before the conductive rubber terminal T3 is fitted into the recess 63.
In the present embodiment, the lead wire L and the terminal fitting 20 inserted from the variable resistor unit 1 side should not collide with each other.
The conductive rubber terminal T3 has an elongated shape such as an elliptical shape or an oval shape, and the end of the lead wire L is connected to the conductive rubber terminal T3.
Is inserted at one end side so as to keep a distance from a portion into which the terminal fitting 20 is inserted. Further, as shown in FIG. 5B, when the insertion portion 20e of the terminal fitting 20 penetrates the conductive rubber terminal T3 in the thickness direction and is partially embedded in the filled insulating resin 66. The terminal fitting 20 can be more firmly fixed to the conductive rubber terminal T3. Here, the insulating resin 66 is illustrated as being transparent.

In this embodiment, the insulating resin is filled in the resin filling space 65 through the slit S5 through which the lead wire L passes.
Needless to say, it may be provided at In this embodiment, four columnar projections 64a to 64d are used, but the number and shape of the projections are arbitrary. For example, two linear projections may be arranged so as to extend from the slit S5 side at an interval of two. Further, in this embodiment, the lead wire L is inserted from the back side of the conductive rubber terminal. However, when the assembling operation is performed carefully, the lead wire may be inserted from the side or the front side of the conductive rubber terminal.

Returning to FIG. 2, the flat plate portions 41a and 41b of the bottom wall portion 40 of the electronic component case 31 are
Terminal fittings 67 to 69 having the same structure as the terminal fitting 13 provided at
Are provided integrally with the terminal mounting portions 70 to 72 for fixing the terminals. One lead wire of the capacitor C1 is soldered to the terminal fitting 67, one lead wire of the capacitor C2 is soldered to the terminal fitting 68, and one lead wire of the capacitor C3 is connected to the terminal fitting 69. Connected by soldering. Since the structure and the mounting state of the terminal fittings 13 and 67 to 69 and the terminal mounting portions 10 and 70 to 72 are the same, FIG.
Description will be made with reference to (A) and (B).

The terminal mounting portion 70 has two press-fitting grooves 70a and 70b arranged side by side at a predetermined interval. These press-fitting grooves 70a and 70b are provided on a pair of mounting bases 70c and 70d having a U-shaped cross section. The pair of mounts 70c and 70d are provided integrally with the flat plate portion 41a with the openings facing each other. A pair of wall portions 70 facing each other at a predetermined interval among the wall portions forming the mounting bases 70c and 70d.
c1 and 70c2 and 70d1 and 70d2 have slits 70a1 and 70a2 and 70b1 and 70b2 (not shown) extending from the end face toward the flat plate portion 41a located at the edge of the electronic component case 31 at the non-fixed end. Are respectively formed, and two slits 70a1
And 70a2 or 70b1 and 70b2 constitute one press-fitting groove 70a or 70b. Slits 70a1 and 70a2 or 70b1 and 70b2
Has an inverted trapezoidal shape in which the width dimension gradually decreases from the end face side, and the width dimension at the bottom of the slit is smaller than the diameter dimension of the metal wire forming the terminal fitting 67.

When the mounting bases 70c and 70d having a U-shaped cross section are used as in this embodiment, when the insulating resin is filled after assembly, the insulating resin also enters the mounting bases 70c and 70d. Therefore, the insulation of the terminal portion can be strengthened. In this embodiment, the pair of mounting bases 70c
And 70d, the terminal mounting portion 70 is formed. Of course, the terminal mounting portion 70 may be formed by forming two press-fitting grooves on one stand.

The terminal fitting 67 is formed by bending a rod-shaped metal wire such as a piano wire which can be bent and has a certain degree of rigidity. The terminal fitting 67 connects the first and second terminal components 67a and 67b, which extend in the same direction and are arranged at a predetermined interval, to one end of the first and second terminal components. And a connecting portion 67c. In the middle of the first and second terminal forming portions 67a and 67b, a curved portion 67a1 which is curved in a substantially rectangular shape is provided.
And 67b1 are provided. The curved portions 67a1 and 67b1 are fitted to the press-fitting grooves 70 provided in the terminal mounting portion 70.
press-fit portions 67a11 and 67b11 press-fitted into a and 70b
And a pair of contact portions 67a12 extending in the same direction from both sides of the press-fitting portion and abutting against the outer wall surfaces of a pair of wall portions 70c1 and 70c2 and 70d1 and 70d2 located on both sides of the press-fitting groove portions 70a and 70b of the terminal mounting portion. 67a13 and 67b12 and 67b13 (67b13 is not shown). Further, in this embodiment, the connecting portion 67c is curved in a substantially rectangular shape in the same direction as the bending direction of the bending portions 67a and 67b. The connecting portion 67c is a straight portion 67c1.
, 67c2 and a connecting portion 67c3. A lead wire is wound around the connecting portion 67c3 and then soldered. When the connecting portion 67c is curved as described above, a space can be formed between the connecting portion 67c and the flat plate portion 41a, so that a lead wire can be easily wound and soldering becomes easy.

The inner dimension between the pair of abutting portions 67a12, 67a13 and 67b12 of the curved portions 67a1 and 67b1 is determined by the pair of walls 70c1 and 70c2 and 70d1 and 7 of the mounting bases 70c and 70d of the terminal mounting portion 70.
Od2 is smaller than the outer dimension between them.
As a result, the curved portions 67a1 and 67b1 are pushed and spread to sandwich the pair of walls 70c1 and 70c2 and 70d1 and 70d2 of the mounts 70c and 70d. This pinched state corresponds to the press-fit groove portions 70a and 7
The mounting strength of the terminal fitting 67 is increased in conjunction with the press fitting of the press fitting portions 67a11 and 67b11 into 0b.

The respective cases 2 of the variable resistor unit 1 and the electronic component unit 30 configured as described above
After fitting the terminal fittings 20, 24 and 22 corresponding to the conductive rubber terminals T1 to T3, the space formed between the variable resistor unit 1 and the electronic component unit 30 is filled with epoxy. An insulating resin such as a resin is filled. When the inside is filled with the insulating resin, the whole weight becomes considerably heavy. Therefore, when each of the terminal fittings 67, 68, and 69 of the high-voltage variable resistor is inserted and connected to a connected portion such as a through hole provided on a circuit board (not shown),
A considerable force is applied to the terminals, and there is a possibility that a soldering failure may occur at a soldered portion between each terminal and an electrode of the circuit board. If each of the terminal fittings 67, 68, and 69 inserted into the circuit board has a two-terminal structure as in the present embodiment, the forces are dispersed, so that occurrence of soldering failure can be prevented. In addition, when a terminal fitting such as the terminal fitting 13 is used only to share the weight, it is possible to prevent a large force from being applied to the terminal fitting used for the electrical connection.

A circuit diagram of the high-voltage variable resistor configured as described above is as shown in FIG. 3, and this circuit is a so-called double focus circuit. FIG.
In the figure, the portions where the terminals used in the present embodiment are located are denoted by the same reference numerals as those shown in the drawings. The resistors R1 to R7 and the variable resistors VR1 and VR2 in FIG.
Printed on the surface of the insulating substrate 3 of the variable resistor unit 1.

[0034]

According to the present invention, it is possible to effectively prevent the movement of the electronic component when the insulating resin is filled and to prevent the electronic component from being damaged by the stress applied from the insulating resin layer formed around the electronic component. be able to.

[Brief description of the drawings]

1 (A), 1 (B) and 1 (C) are a rear view, a side view and a front view, respectively, of an embodiment of a high voltage variable resistor according to the present invention.

FIGS. 2A and 2B are bottom views of the variable resistor unit and the electronic component unit used in FIG. 1, respectively.

FIG. 3 is a circuit diagram of the embodiment.

FIG. 4 is a perspective view of a terminal fitting inserted into a conductive rubber terminal.

FIG. 5A is an enlarged plan view of a concave portion into which a conductive rubber terminal is fitted, and FIG. 5B is an enlarged sectional view of a state where a terminal fitting is inserted into the conductive rubber terminal.

FIG. 6A is a sectional view taken along line AA of FIG.
(B) is a front view which shows the state which attached the terminal fitting to the terminal attachment part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Variable resistor unit 2 Resistor case 3 Insulating board 4 Opening 5 Fitting part 7 Flat plate part 8, 9, and 10 Terminal mounting part 11, 12, and 13 Terminal metal fittings 14-16 Pin terminal 17-19 Cylindrical part 20- Reference Signs List 22 terminal fitting 24 terminal fitting 30 electronic component unit 31 electronic component case 32 and 33 opening 36 fitting concave portion 37-39 locking piece 40 bottom wall 41 terminal mounting portion 42-44 capacitor housing 49-51, 55 and 56 And 58 to 61 rib C1 to C3 capacitor D diode T1 to T3 conductive rubber terminal 64a to 64d protrusion 67 to 69 terminal fitting 70 to 72 terminal mounting part

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01C 1/00-1/16 H01C 13/00

Claims (1)

(57) [Claims] 1. An insulating substrate having a resistance circuit including a variable resistor formed on a front surface thereof is accommodated in a resistor case made of an insulating resin having an open end with the back surface facing the opening, and the insulating substrate is provided. A variable resistor unit having a connection terminal fixed to the back surface of the resistor case and a fitting portion provided around the opening of the resistor case; and the fitting portion of the resistor case fitted around the opening. An electronic component case having an electronic component connected to the resistance circuit and an electronic component unit having a connected terminal to which the connection terminal is connected, in an electronic component case made of an insulating resin having a fitted portion to be fitted; The resistor case and the electronic component case are each configured to form an insulating resin filling port for filling the insulating resin on one end surface side in a fitted state, and inside the electronic component case , before from the bottom wall portion A plurality of component storage sections are provided which are partially surrounded by a plurality of ribs extending toward the opening, and a pair of lead wires has low mechanical strength extending in opposite directions.
Electronic components in a direction perpendicular to the direction in which the ribs extend.
Stored in the component storage section so that the pair of lead wires extend.
The ribs that surround the periphery of the component storage unit that stores the electronic component having a low mechanical strength are the rib and the electronic component.
The thickness of the insulating resin layer formed between
High-voltage variable resistor, wherein a difference between the stress applied from the side is provided so that a small.